37 files changed, 10630 insertions, 0 deletions

diff --git a/utils/rbutilqt/mspack/COPYING.LIB b/utils/rbutilqt/mspack/COPYING.LIB
new file mode 100644
index 0000000000..b1e3f5a263
--- /dev/null
+++ b/utils/rbutilqt/mspack/COPYING.LIB
@@ -0,0 +1,504 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
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+                     END OF TERMS AND CONDITIONS
+
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+That's all there is to it!
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+
diff --git a/utils/rbutilqt/mspack/README.ROCKBOX b/utils/rbutilqt/mspack/README.ROCKBOX
new file mode 100644
index 0000000000..220691af2c
--- /dev/null
+++ b/utils/rbutilqt/mspack/README.ROCKBOX
@@ -0,0 +1,6 @@
+This folder contains the mspack project for MS files compression/decompression.
+These files are distributed under the LGPL.
+
+The source files have been last synced with libmspack-0.10.1alpha
+https://www.cabextract.org.uk/libmspack/ on June 8, 2020
+
diff --git a/utils/rbutilqt/mspack/cab.h b/utils/rbutilqt/mspack/cab.h
new file mode 100644
index 0000000000..79d9951252
--- /dev/null
+++ b/utils/rbutilqt/mspack/cab.h
@@ -0,0 +1,140 @@
+/* This file is part of libmspack.
+ * (C) 2003-2018 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_CAB_H
+#define MSPACK_CAB_H 1
+
+/* generic CAB definitions */
+
+/* structure offsets */
+#define cfhead_Signature         (0x00)
+#define cfhead_CabinetSize       (0x08)
+#define cfhead_FileOffset        (0x10)
+#define cfhead_MinorVersion      (0x18)
+#define cfhead_MajorVersion      (0x19)
+#define cfhead_NumFolders        (0x1A)
+#define cfhead_NumFiles          (0x1C)
+#define cfhead_Flags             (0x1E)
+#define cfhead_SetID             (0x20)
+#define cfhead_CabinetIndex      (0x22)
+#define cfhead_SIZEOF            (0x24)
+#define cfheadext_HeaderReserved (0x00)
+#define cfheadext_FolderReserved (0x02)
+#define cfheadext_DataReserved   (0x03)
+#define cfheadext_SIZEOF         (0x04)
+#define cffold_DataOffset        (0x00)
+#define cffold_NumBlocks         (0x04)
+#define cffold_CompType          (0x06)
+#define cffold_SIZEOF            (0x08)
+#define cffile_UncompressedSize  (0x00)
+#define cffile_FolderOffset      (0x04)
+#define cffile_FolderIndex       (0x08)
+#define cffile_Date              (0x0A)
+#define cffile_Time              (0x0C)
+#define cffile_Attribs           (0x0E)
+#define cffile_SIZEOF            (0x10)
+#define cfdata_CheckSum          (0x00)
+#define cfdata_CompressedSize    (0x04)
+#define cfdata_UncompressedSize  (0x06)
+#define cfdata_SIZEOF            (0x08)
+
+/* flags */
+#define cffoldCOMPTYPE_MASK            (0x000f)
+#define cffoldCOMPTYPE_NONE            (0x0000)
+#define cffoldCOMPTYPE_MSZIP           (0x0001)
+#define cffoldCOMPTYPE_QUANTUM         (0x0002)
+#define cffoldCOMPTYPE_LZX             (0x0003)
+#define cfheadPREV_CABINET             (0x0001)
+#define cfheadNEXT_CABINET             (0x0002)
+#define cfheadRESERVE_PRESENT          (0x0004)
+#define cffileCONTINUED_FROM_PREV      (0xFFFD)
+#define cffileCONTINUED_TO_NEXT        (0xFFFE)
+#define cffileCONTINUED_PREV_AND_NEXT  (0xFFFF)
+
+/* CAB data blocks are <= 32768 bytes in uncompressed form. Uncompressed
+ * blocks have zero growth. MSZIP guarantees that it won't grow above
+ * uncompressed size by more than 12 bytes. LZX guarantees it won't grow
+ * more than 6144 bytes. Quantum has no documentation, but the largest
+ * block seen in the wild is 337 bytes above uncompressed size.
+ */
+#define CAB_BLOCKMAX (32768)
+#define CAB_INPUTMAX (CAB_BLOCKMAX+6144)
+
+/* input buffer needs to be CAB_INPUTMAX + 1 byte to allow for max-sized block
+ * plus 1 trailer byte added by cabd_sys_read_block() for Quantum alignment.
+ *
+ * When MSCABD_PARAM_SALVAGE is set, block size is not checked so can be
+ * up to 65535 bytes, so max input buffer size needed is 65535 + 1
+ */
+#define CAB_INPUTMAX_SALVAGE (65535)
+#define CAB_INPUTBUF (CAB_INPUTMAX_SALVAGE + 1)
+
+/* There are no more than 65535 data blocks per folder, so a folder cannot
+ * be more than 32768*65535 bytes in length. As files cannot span more than
+ * one folder, this is also their max offset, length and offset+length limit.
+ */
+#define CAB_FOLDERMAX (65535)
+#define CAB_LENGTHMAX (CAB_BLOCKMAX * CAB_FOLDERMAX)
+
+/* CAB compression definitions */
+
+struct mscab_compressor_p {
+  struct mscab_compressor base;
+  struct mspack_system *system;
+  /* todo */
+};
+
+/* CAB decompression definitions */
+
+struct mscabd_decompress_state {
+  struct mscabd_folder_p *folder;    /* current folder we're extracting from */
+  struct mscabd_folder_data *data;   /* current folder split we're in        */
+  unsigned int offset;               /* uncompressed offset within folder    */
+  unsigned int block;                /* which block are we decompressing?    */
+  off_t outlen;                      /* cumulative sum of block output sizes */
+  struct mspack_system sys;          /* special I/O code for decompressor    */
+  int comp_type;                     /* type of compression used by folder   */
+  int (*decompress)(void *, off_t);  /* decompressor code                    */
+  void *state;                       /* decompressor state                   */
+  struct mscabd_cabinet_p *incab;    /* cabinet where input data comes from  */
+  struct mspack_file *infh;          /* input file handle                    */
+  struct mspack_file *outfh;         /* output file handle                   */
+  unsigned char *i_ptr, *i_end;      /* input data consumed, end             */
+  unsigned char input[CAB_INPUTBUF]; /* one input block of data              */
+};
+
+struct mscab_decompressor_p {
+  struct mscab_decompressor base;
+  struct mscabd_decompress_state *d;
+  struct mspack_system *system;
+  int buf_size, searchbuf_size, fix_mszip, salvage; /* params */
+  int error, read_error;
+};
+
+struct mscabd_cabinet_p {
+  struct mscabd_cabinet base;
+  off_t blocks_off;                  /* offset to data blocks                */
+  int block_resv;                    /* reserved space in data blocks        */
+};
+
+/* there is one of these for every cabinet a folder spans */
+struct mscabd_folder_data {
+  struct mscabd_folder_data *next;
+  struct mscabd_cabinet_p *cab;      /* cabinet file of this folder span     */
+  off_t offset;                      /* cabinet offset of first datablock    */
+};
+
+struct mscabd_folder_p {
+  struct mscabd_folder base;
+  struct mscabd_folder_data data;    /* where are the data blocks?           */
+  struct mscabd_file *merge_prev;    /* first file needing backwards merge   */
+  struct mscabd_file *merge_next;    /* first file needing forwards merge    */
+};
+
+#endif
diff --git a/utils/rbutilqt/mspack/cabc.c b/utils/rbutilqt/mspack/cabc.c
new file mode 100644
index 0000000000..eb85011056
--- /dev/null
+++ b/utils/rbutilqt/mspack/cabc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* CAB compression implementation */
+
+#include "system-mspack.h"
+#include "cab.h"
+
+struct mscab_compressor *
+  mspack_create_cab_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_cab_compressor(struct mscab_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/cabd.c b/utils/rbutilqt/mspack/cabd.c
new file mode 100644
index 0000000000..ae66769b24
--- /dev/null
+++ b/utils/rbutilqt/mspack/cabd.c
@@ -0,0 +1,1508 @@
+/* This file is part of libmspack.
+ * (C) 2003-2018 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* Cabinet (.CAB) files are a form of file archive. Each cabinet contains
+ * "folders", which are compressed spans of data. Each cabinet has
+ * "files", whose metadata is in the cabinet header, but whose actual data
+ * is stored compressed in one of the "folders". Cabinets can span more
+ * than one physical file on disk, in which case they are a "cabinet set",
+ * and usually the last folder of each cabinet extends into the next
+ * cabinet.
+ *
+ * For a complete description of the format, see the MSDN site:
+ *   http://msdn.microsoft.com/en-us/library/bb267310.aspx
+ */
+
+/* CAB decompression implementation */
+
+#include "system-mspack.h"
+#include "cab.h"
+#include "mszip.h"
+#include "lzx.h"
+#include "qtm.h"
+
+/* Notes on compliance with cabinet specification:
+ *
+ * One of the main changes between cabextract 0.6 and libmspack's cab
+ * decompressor is the move from block-oriented decompression to
+ * stream-oriented decompression.
+ *
+ * cabextract would read one data block from disk, decompress it with the
+ * appropriate method, then write the decompressed data. The CAB
+ * specification is specifically designed to work like this, as it ensures
+ * compression matches do not span the maximum decompressed block size
+ * limit of 32kb.
+ *
+ * However, the compression algorithms used are stream oriented, with
+ * specific hacks added to them to enforce the "individual 32kb blocks"
+ * rule in CABs. In other file formats, they do not have this limitation.
+ *
+ * In order to make more generalised decompressors, libmspack's CAB
+ * decompressor has moved from being block-oriented to more stream
+ * oriented. This also makes decompression slightly faster.
+ *
+ * However, this leads to incompliance with the CAB specification. The
+ * CAB controller can no longer ensure each block of input given to the
+ * decompressors is matched with their output. The "decompressed size" of
+ * each individual block is thrown away.
+ *
+ * Each CAB block is supposed to be seen as individually compressed. This
+ * means each consecutive data block can have completely different
+ * "uncompressed" sizes, ranging from 1 to 32768 bytes. However, in
+ * reality, all data blocks in a folder decompress to exactly 32768 bytes,
+ * excepting the final block. 
+ *
+ * Given this situation, the decompression algorithms are designed to
+ * realign their input bitstreams on 32768 output-byte boundaries, and
+ * various other special cases have been made. libmspack will not
+ * correctly decompress LZX or Quantum compressed folders where the blocks
+ * do not follow this "32768 bytes until last block" pattern. It could be
+ * implemented if needed, but hopefully this is not necessary -- it has
+ * not been seen in over 3Gb of CAB archives.
+ */
+
+/* prototypes */
+static struct mscabd_cabinet * cabd_open(
+  struct mscab_decompressor *base, const char *filename);
+static void cabd_close(
+  struct mscab_decompressor *base, struct mscabd_cabinet *origcab);
+static int cabd_read_headers(
+  struct mspack_system *sys, struct mspack_file *fh,
+  struct mscabd_cabinet_p *cab, off_t offset, int salvage, int quiet);
+static char *cabd_read_string(
+  struct mspack_system *sys, struct mspack_file *fh, int *error);
+
+static struct mscabd_cabinet *cabd_search(
+  struct mscab_decompressor *base, const char *filename);
+static int cabd_find(
+  struct mscab_decompressor_p *self, unsigned char *buf,
+  struct mspack_file *fh, const char *filename, off_t flen,
+  off_t *firstlen, struct mscabd_cabinet_p **firstcab);
+
+static int cabd_prepend(
+  struct mscab_decompressor *base, struct mscabd_cabinet *cab,
+  struct mscabd_cabinet *prevcab);
+static int cabd_append(
+  struct mscab_decompressor *base, struct mscabd_cabinet *cab,
+  struct mscabd_cabinet *nextcab);
+static int cabd_merge(
+  struct mscab_decompressor *base, struct mscabd_cabinet *lcab,
+  struct mscabd_cabinet *rcab);
+static int cabd_can_merge_folders(
+  struct mspack_system *sys, struct mscabd_folder_p *lfol,
+  struct mscabd_folder_p *rfol);
+
+static int cabd_extract(
+  struct mscab_decompressor *base, struct mscabd_file *file,
+  const char *filename);
+static int cabd_init_decomp(
+  struct mscab_decompressor_p *self, unsigned int ct);
+static void cabd_free_decomp(
+  struct mscab_decompressor_p *self);
+static int cabd_sys_read(
+  struct mspack_file *file, void *buffer, int bytes);
+static int cabd_sys_write(
+  struct mspack_file *file, void *buffer, int bytes);
+static int cabd_sys_read_block(
+  struct mspack_system *sys, struct mscabd_decompress_state *d, int *out,
+  int ignore_cksum, int ignore_blocksize);
+static unsigned int cabd_checksum(
+  unsigned char *data, unsigned int bytes, unsigned int cksum);
+static struct noned_state *noned_init(
+  struct mspack_system *sys, struct mspack_file *in, struct mspack_file *out,
+  int bufsize);
+
+static int noned_decompress(
+  struct noned_state *s, off_t bytes);
+static void noned_free(
+  struct noned_state *state);
+
+static int cabd_param(
+  struct mscab_decompressor *base, int param, int value);
+
+static int cabd_error(
+  struct mscab_decompressor *base);
+
+
+/***************************************
+ * MSPACK_CREATE_CAB_DECOMPRESSOR
+ ***************************************
+ * constructor
+ */
+struct mscab_decompressor *
+  mspack_create_cab_decompressor(struct mspack_system *sys)
+{
+  struct mscab_decompressor_p *self = NULL;
+
+  if (!sys) sys = mspack_default_system;
+  if (!mspack_valid_system(sys)) return NULL;
+
+  if ((self = (struct mscab_decompressor_p *) sys->alloc(sys, sizeof(struct mscab_decompressor_p)))) {
+    self->base.open       = &cabd_open;
+    self->base.close      = &cabd_close;
+    self->base.search     = &cabd_search;
+    self->base.extract    = &cabd_extract;
+    self->base.prepend    = &cabd_prepend;
+    self->base.append     = &cabd_append;
+    self->base.set_param  = &cabd_param;
+    self->base.last_error = &cabd_error;
+    self->system          = sys;
+    self->d               = NULL;
+    self->error           = MSPACK_ERR_OK;
+
+    self->searchbuf_size  = 32768;
+    self->fix_mszip       = 0;
+    self->buf_size        = 4096;
+    self->salvage         = 0;
+  }
+  return (struct mscab_decompressor *) self;
+}
+
+/***************************************
+ * MSPACK_DESTROY_CAB_DECOMPRESSOR
+ ***************************************
+ * destructor
+ */
+void mspack_destroy_cab_decompressor(struct mscab_decompressor *base) {
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  if (self) {
+    struct mspack_system *sys = self->system;
+    if (self->d) {
+      if (self->d->infh) sys->close(self->d->infh);
+      cabd_free_decomp(self);
+      sys->free(self->d);
+    }
+    sys->free(self);
+  }
+}
+
+
+/***************************************
+ * CABD_OPEN
+ ***************************************
+ * opens a file and tries to read it as a cabinet file
+ */
+static struct mscabd_cabinet *cabd_open(struct mscab_decompressor *base,
+                                        const char *filename)
+{
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  struct mscabd_cabinet_p *cab = NULL;
+  struct mspack_system *sys;
+  struct mspack_file *fh;
+  int error;
+
+  if (!base) return NULL;
+  sys = self->system;
+
+  if ((fh = sys->open(sys, filename, MSPACK_SYS_OPEN_READ))) {
+    if ((cab = (struct mscabd_cabinet_p *) sys->alloc(sys, sizeof(struct mscabd_cabinet_p)))) {
+      cab->base.filename = filename;
+      error = cabd_read_headers(sys, fh, cab, (off_t) 0, self->salvage, 0);
+      if (error) {
+        cabd_close(base, (struct mscabd_cabinet *) cab);
+        cab = NULL;
+      }
+      self->error = error;
+    }
+    else {
+      self->error = MSPACK_ERR_NOMEMORY;
+    }
+    sys->close(fh);
+  }
+  else {
+    self->error = MSPACK_ERR_OPEN;
+  }
+  return (struct mscabd_cabinet *) cab;
+}
+
+/***************************************
+ * CABD_CLOSE
+ ***************************************
+ * frees all memory associated with a given mscabd_cabinet.
+ */
+static void cabd_close(struct mscab_decompressor *base,
+                       struct mscabd_cabinet *origcab)
+{
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  struct mscabd_folder_data *dat, *ndat;
+  struct mscabd_cabinet *cab, *ncab;
+  struct mscabd_folder *fol, *nfol;
+  struct mscabd_file *fi, *nfi;
+  struct mspack_system *sys;
+
+  if (!base) return;
+  sys = self->system;
+
+  self->error = MSPACK_ERR_OK;
+
+  while (origcab) {
+    /* free files */
+    for (fi = origcab->files; fi; fi = nfi) {
+      nfi = fi->next;
+      sys->free(fi->filename);
+      sys->free(fi);
+    }
+
+    /* free folders */
+    for (fol = origcab->folders; fol; fol = nfol) {
+      nfol = fol->next;
+
+      /* free folder decompression state if it has been decompressed */
+      if (self->d && (self->d->folder == (struct mscabd_folder_p *) fol)) {
+        if (self->d->infh) sys->close(self->d->infh);
+        cabd_free_decomp(self);
+        sys->free(self->d);
+        self->d = NULL;
+      }
+
+      /* free folder data segments */
+      for (dat = ((struct mscabd_folder_p *)fol)->data.next; dat; dat = ndat) {
+        ndat = dat->next;
+        sys->free(dat);
+      }
+      sys->free(fol);
+    }
+
+    /* free predecessor cabinets (and the original cabinet's strings) */
+    for (cab = origcab; cab; cab = ncab) {
+      ncab = cab->prevcab;
+      sys->free(cab->prevname);
+      sys->free(cab->nextname);
+      sys->free(cab->previnfo);
+      sys->free(cab->nextinfo);
+      if (cab != origcab) sys->free(cab);
+    }
+
+    /* free successor cabinets */
+    for (cab = origcab->nextcab; cab; cab = ncab) {
+      ncab = cab->nextcab;
+      sys->free(cab->prevname);
+      sys->free(cab->nextname);
+      sys->free(cab->previnfo);
+      sys->free(cab->nextinfo);
+      sys->free(cab);
+    }
+
+    /* free actual cabinet structure */
+    cab = origcab->next;
+    sys->free(origcab);
+
+    /* repeat full procedure again with the cab->next pointer (if set) */
+    origcab = cab;
+  }
+}
+
+/***************************************
+ * CABD_READ_HEADERS
+ ***************************************
+ * reads the cabinet file header, folder list and file list.
+ * fills out a pre-existing mscabd_cabinet structure, allocates memory
+ * for folders and files as necessary
+ */
+static int cabd_read_headers(struct mspack_system *sys,
+                             struct mspack_file *fh,
+                             struct mscabd_cabinet_p *cab,
+                             off_t offset, int salvage, int quiet)
+{
+  int num_folders, num_files, folder_resv, i, x, err, fidx;
+  struct mscabd_folder_p *fol, *linkfol = NULL;
+  struct mscabd_file *file, *linkfile = NULL;
+  unsigned char buf[64];
+
+  /* initialise pointers */
+  cab->base.next     = NULL;
+  cab->base.files    = NULL;
+  cab->base.folders  = NULL;
+  cab->base.prevcab  = cab->base.nextcab  = NULL;
+  cab->base.prevname = cab->base.nextname = NULL;
+  cab->base.previnfo = cab->base.nextinfo = NULL;
+
+  cab->base.base_offset = offset;
+
+  /* seek to CFHEADER */
+  if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
+    return MSPACK_ERR_SEEK;
+  }
+
+  /* read in the CFHEADER */
+  if (sys->read(fh, &buf[0], cfhead_SIZEOF) != cfhead_SIZEOF) {
+    return MSPACK_ERR_READ;
+  }
+
+  /* check for "MSCF" signature */
+  if (EndGetI32(&buf[cfhead_Signature]) != 0x4643534D) {
+    return MSPACK_ERR_SIGNATURE;
+  }
+
+  /* some basic header fields */
+  cab->base.length    = EndGetI32(&buf[cfhead_CabinetSize]);
+  cab->base.set_id    = EndGetI16(&buf[cfhead_SetID]);
+  cab->base.set_index = EndGetI16(&buf[cfhead_CabinetIndex]);
+
+  /* get the number of folders */
+  num_folders = EndGetI16(&buf[cfhead_NumFolders]);
+  if (num_folders == 0) {
+    if (!quiet) sys->message(fh, "no folders in cabinet.");
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* get the number of files */
+  num_files = EndGetI16(&buf[cfhead_NumFiles]);
+  if (num_files == 0) {
+    if (!quiet) sys->message(fh, "no files in cabinet.");
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* check cabinet version */
+  if ((buf[cfhead_MajorVersion] != 1) && (buf[cfhead_MinorVersion] != 3)) {
+    if (!quiet) sys->message(fh, "WARNING; cabinet version is not 1.3");
+  }
+
+  /* read the reserved-sizes part of header, if present */
+  cab->base.flags = EndGetI16(&buf[cfhead_Flags]);
+
+  if (cab->base.flags & cfheadRESERVE_PRESENT) {
+    if (sys->read(fh, &buf[0], cfheadext_SIZEOF) != cfheadext_SIZEOF) {
+      return MSPACK_ERR_READ;
+    }
+    cab->base.header_resv = EndGetI16(&buf[cfheadext_HeaderReserved]);
+    folder_resv           = buf[cfheadext_FolderReserved];
+    cab->block_resv       = buf[cfheadext_DataReserved];
+
+    if (cab->base.header_resv > 60000) {
+      if (!quiet) sys->message(fh, "WARNING; reserved header > 60000.");
+    }
+
+    /* skip the reserved header */
+    if (cab->base.header_resv) {
+      if (sys->seek(fh, (off_t) cab->base.header_resv, MSPACK_SYS_SEEK_CUR)) {
+        return MSPACK_ERR_SEEK;
+      }
+    }
+  }
+  else {
+    cab->base.header_resv = 0;
+    folder_resv           = 0; 
+    cab->block_resv       = 0;
+  }
+
+  /* read name and info of preceeding cabinet in set, if present */
+  if (cab->base.flags & cfheadPREV_CABINET) {
+    cab->base.prevname = cabd_read_string(sys, fh, &err);
+    if (err) return err;
+    cab->base.previnfo = cabd_read_string(sys, fh, &err);
+    if (err) return err;
+  }
+
+  /* read name and info of next cabinet in set, if present */
+  if (cab->base.flags & cfheadNEXT_CABINET) {
+    cab->base.nextname = cabd_read_string(sys, fh, &err);
+    if (err) return err;
+    cab->base.nextinfo = cabd_read_string(sys, fh, &err);
+    if (err) return err;
+  }
+
+  /* read folders */
+  for (i = 0; i < num_folders; i++) {
+    if (sys->read(fh, &buf[0], cffold_SIZEOF) != cffold_SIZEOF) {
+      return MSPACK_ERR_READ;
+    }
+    if (folder_resv) {
+      if (sys->seek(fh, (off_t) folder_resv, MSPACK_SYS_SEEK_CUR)) {
+        return MSPACK_ERR_SEEK;
+      }
+    }
+
+    if (!(fol = (struct mscabd_folder_p *) sys->alloc(sys, sizeof(struct mscabd_folder_p)))) {
+      return MSPACK_ERR_NOMEMORY;
+    }
+    fol->base.next       = NULL;
+    fol->base.comp_type  = EndGetI16(&buf[cffold_CompType]);
+    fol->base.num_blocks = EndGetI16(&buf[cffold_NumBlocks]);
+    fol->data.next       = NULL;
+    fol->data.cab        = (struct mscabd_cabinet_p *) cab;
+    fol->data.offset     = offset + (off_t)
+      ( (unsigned int) EndGetI32(&buf[cffold_DataOffset]) );
+    fol->merge_prev      = NULL;
+    fol->merge_next      = NULL;
+
+    /* link folder into list of folders */
+    if (!linkfol) cab->base.folders = (struct mscabd_folder *) fol;
+    else linkfol->base.next = (struct mscabd_folder *) fol;
+    linkfol = fol;
+  }
+
+  /* read files */
+  for (i = 0; i < num_files; i++) {
+    if (sys->read(fh, &buf[0], cffile_SIZEOF) != cffile_SIZEOF) {
+      return MSPACK_ERR_READ;
+    }
+
+    if (!(file = (struct mscabd_file *) sys->alloc(sys, sizeof(struct mscabd_file)))) {
+      return MSPACK_ERR_NOMEMORY;
+    }
+
+    file->next     = NULL;
+    file->length   = EndGetI32(&buf[cffile_UncompressedSize]);
+    file->attribs  = EndGetI16(&buf[cffile_Attribs]);
+    file->offset   = EndGetI32(&buf[cffile_FolderOffset]);
+
+    /* set folder pointer */
+    fidx = EndGetI16(&buf[cffile_FolderIndex]);
+    if (fidx < cffileCONTINUED_FROM_PREV) {
+      /* normal folder index; count up to the correct folder */
+      if (fidx < num_folders) {
+        struct mscabd_folder *ifol = cab->base.folders;
+        while (fidx--) if (ifol) ifol = ifol->next;
+        file->folder = ifol;
+      }
+      else {
+        D(("invalid folder index"))
+        file->folder = NULL;
+      }
+    }
+    else {
+      /* either CONTINUED_TO_NEXT, CONTINUED_FROM_PREV or
+       * CONTINUED_PREV_AND_NEXT */
+      if ((fidx == cffileCONTINUED_TO_NEXT) ||
+          (fidx == cffileCONTINUED_PREV_AND_NEXT))
+      {
+        /* get last folder */
+        struct mscabd_folder *ifol = cab->base.folders;
+        while (ifol->next) ifol = ifol->next;
+        file->folder = ifol;
+
+        /* set "merge next" pointer */
+        fol = (struct mscabd_folder_p *) ifol;
+        if (!fol->merge_next) fol->merge_next = file;
+      }
+
+      if ((fidx == cffileCONTINUED_FROM_PREV) ||
+          (fidx == cffileCONTINUED_PREV_AND_NEXT))
+      {
+        /* get first folder */
+        file->folder = cab->base.folders;
+
+        /* set "merge prev" pointer */
+        fol = (struct mscabd_folder_p *) file->folder;
+        if (!fol->merge_prev) fol->merge_prev = file;
+      }
+    }
+
+    /* get time */
+    x = EndGetI16(&buf[cffile_Time]);
+    file->time_h = x >> 11;
+    file->time_m = (x >> 5) & 0x3F;
+    file->time_s = (x << 1) & 0x3E;
+
+    /* get date */
+    x = EndGetI16(&buf[cffile_Date]);
+    file->date_d = x & 0x1F;
+    file->date_m = (x >> 5) & 0xF;
+    file->date_y = (x >> 9) + 1980;
+
+    /* get filename */
+    file->filename = cabd_read_string(sys, fh, &err);
+
+    /* if folder index or filename are bad, either skip it or fail */
+    if (err || !file->folder) {
+      sys->free(file->filename);
+      sys->free(file);
+      if (salvage) continue;
+      return err ? err : MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* link file entry into file list */
+    if (!linkfile) cab->base.files = file;
+    else linkfile->next = file;
+    linkfile = file;
+  }
+
+  if (cab->base.files == NULL) {
+    /* We never actually added any files to the file list.  Something went wrong.
+     * The file header may have been invalid */
+    D(("No files found, even though header claimed to have %d files", num_files))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  return MSPACK_ERR_OK;
+}
+
+static char *cabd_read_string(struct mspack_system *sys,
+                              struct mspack_file *fh, int *error)
+{
+  off_t base = sys->tell(fh);
+  char buf[256], *str;
+  int len, i, ok;
+
+  /* read up to 256 bytes */
+  if ((len = sys->read(fh, &buf[0], 256)) <= 0) {
+    *error = MSPACK_ERR_READ;
+    return NULL;
+  }
+
+  /* search for a null terminator in the buffer */
+  for (i = 0, ok = 0; i < len; i++) if (!buf[i]) { ok = 1; break; }
+  /* reject empty strings */
+  if (i == 0) ok = 0;
+
+  if (!ok) {
+    *error = MSPACK_ERR_DATAFORMAT;
+    return NULL;
+  }
+
+  len = i + 1;
+
+  /* set the data stream to just after the string and return */
+  if (sys->seek(fh, base + (off_t)len, MSPACK_SYS_SEEK_START)) {
+    *error = MSPACK_ERR_SEEK;
+    return NULL;
+  }
+
+  if (!(str = (char *) sys->alloc(sys, len))) {
+    *error = MSPACK_ERR_NOMEMORY;
+    return NULL;
+  }
+
+  sys->copy(&buf[0], str, len);
+  *error = MSPACK_ERR_OK;
+  return str;
+}
+    
+/***************************************
+ * CABD_SEARCH, CABD_FIND
+ ***************************************
+ * cabd_search opens a file, finds its extent, allocates a search buffer,
+ * then reads through the whole file looking for possible cabinet headers.
+ * if it finds any, it tries to read them as real cabinets. returns a linked
+ * list of results
+ *
+ * cabd_find is the inner loop of cabd_search, to make it easier to
+ * break out of the loop and be sure that all resources are freed
+ */
+static struct mscabd_cabinet *cabd_search(struct mscab_decompressor *base,
+                                          const char *filename)
+{
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  struct mscabd_cabinet_p *cab = NULL;
+  struct mspack_system *sys;
+  unsigned char *search_buf;
+  struct mspack_file *fh;
+  off_t filelen, firstlen = 0;
+
+  if (!base) return NULL;
+  sys = self->system;
+
+  /* allocate a search buffer */
+  search_buf = (unsigned char *) sys->alloc(sys, (size_t) self->searchbuf_size);
+  if (!search_buf) {
+    self->error = MSPACK_ERR_NOMEMORY;
+    return NULL;
+  }
+
+  /* open file and get its full file length */
+  if ((fh = sys->open(sys, filename, MSPACK_SYS_OPEN_READ))) {
+    if (!(self->error = mspack_sys_filelen(sys, fh, &filelen))) {
+      self->error = cabd_find(self, search_buf, fh, filename,
+                              filelen, &firstlen, &cab);
+    }
+
+    /* truncated / extraneous data warning: */
+    if (firstlen && (firstlen != filelen) &&
+        (!cab || (cab->base.base_offset == 0)))
+    {
+      if (firstlen < filelen) {
+        sys->message(fh, "WARNING; possible %" LD
+                     " extra bytes at end of file.",
+                     filelen - firstlen);
+      }
+      else {
+        sys->message(fh, "WARNING; file possibly truncated by %" LD " bytes.",
+                     firstlen - filelen);
+      }
+    }
+    
+    sys->close(fh);
+  }
+  else {
+    self->error = MSPACK_ERR_OPEN;
+  }
+
+  /* free the search buffer */
+  sys->free(search_buf);
+
+  return (struct mscabd_cabinet *) cab;
+}
+
+static int cabd_find(struct mscab_decompressor_p *self, unsigned char *buf,
+                     struct mspack_file *fh, const char *filename, off_t flen,
+                     off_t *firstlen, struct mscabd_cabinet_p **firstcab)
+{
+  struct mscabd_cabinet_p *cab, *link = NULL;
+  off_t caboff, offset, length;
+  struct mspack_system *sys = self->system;
+  unsigned char *p, *pend, state = 0;
+  unsigned int cablen_u32 = 0, foffset_u32 = 0;
+  int false_cabs = 0;
+
+#if !LARGEFILE_SUPPORT
+  /* detect 32-bit off_t overflow */
+  if (flen < 0) {
+    sys->message(fh, largefile_msg);
+    return MSPACK_ERR_OK;
+  }
+#endif
+
+  /* search through the full file length */
+  for (offset = 0; offset < flen; offset += length) {
+    /* search length is either the full length of the search buffer, or the
+     * amount of data remaining to the end of the file, whichever is less. */
+    length = flen - offset;
+    if (length > self->searchbuf_size) {
+      length = self->searchbuf_size;
+    }
+
+    /* fill the search buffer with data from disk */
+    if (sys->read(fh, &buf[0], (int) length) != (int) length) {
+      return MSPACK_ERR_READ;
+    }
+
+    /* FAQ avoidance strategy */
+    if ((offset == 0) && (EndGetI32(&buf[0]) == 0x28635349)) {
+      sys->message(fh, "WARNING; found InstallShield header. Use unshield "
+                   "(https://github.com/twogood/unshield) to unpack this file"); 
+    }
+
+    /* read through the entire buffer. */
+    for (p = &buf[0], pend = &buf[length]; p < pend; ) {
+      switch (state) {
+        /* starting state */
+      case 0:
+        /* we spend most of our time in this while loop, looking for
+         * a leading 'M' of the 'MSCF' signature */
+        while (p < pend && *p != 0x4D) p++;
+        /* if we found tht 'M', advance state */
+        if (p++ < pend) state = 1;
+        break;
+
+      /* verify that the next 3 bytes are 'S', 'C' and 'F' */
+      case 1: state = (*p++ == 0x53) ? 2 : 0; break;
+      case 2: state = (*p++ == 0x43) ? 3 : 0; break;
+      case 3: state = (*p++ == 0x46) ? 4 : 0; break;
+
+      /* we don't care about bytes 4-7 (see default: for action) */
+
+      /* bytes 8-11 are the overall length of the cabinet */
+      case 8:  cablen_u32  = *p++;       state++; break;
+      case 9:  cablen_u32 |= *p++ << 8;  state++; break;
+      case 10: cablen_u32 |= *p++ << 16; state++; break;
+      case 11: cablen_u32 |= *p++ << 24; state++; break;
+
+      /* we don't care about bytes 12-15 (see default: for action) */
+
+      /* bytes 16-19 are the offset within the cabinet of the filedata */
+      case 16: foffset_u32  = *p++;       state++; break;
+      case 17: foffset_u32 |= *p++ << 8;  state++; break;
+      case 18: foffset_u32 |= *p++ << 16; state++; break;
+      case 19: foffset_u32 |= *p++ << 24;
+        /* now we have recieved 20 bytes of potential cab header. work out
+         * the offset in the file of this potential cabinet */
+        caboff = offset + (p - &buf[0]) - 20;
+
+        /* should reading cabinet fail, restart search just after 'MSCF' */
+        offset = caboff + 4;
+
+        /* capture the "length of cabinet" field if there is a cabinet at
+         * offset 0 in the file, regardless of whether the cabinet can be
+         * read correctly or not */
+        if (caboff == 0) *firstlen = (off_t) cablen_u32;
+
+        /* check that the files offset is less than the alleged length of
+         * the cabinet, and that the offset + the alleged length are
+         * 'roughly' within the end of overall file length. In salvage
+         * mode, don't check the alleged length, allow it to be garbage */
+        if ((foffset_u32 < cablen_u32) &&
+            ((caboff + (off_t) foffset_u32) < (flen + 32)) &&
+            (((caboff + (off_t) cablen_u32)  < (flen + 32)) || self->salvage))
+        {
+          /* likely cabinet found -- try reading it */
+          if (!(cab = (struct mscabd_cabinet_p *) sys->alloc(sys, sizeof(struct mscabd_cabinet_p)))) {
+            return MSPACK_ERR_NOMEMORY;
+          }
+          cab->base.filename = filename;
+          if (cabd_read_headers(sys, fh, cab, caboff, self->salvage, 1)) {
+            /* destroy the failed cabinet */
+            cabd_close((struct mscab_decompressor *) self,
+                       (struct mscabd_cabinet *) cab);
+            false_cabs++;
+          }
+          else {
+            /* cabinet read correctly! */
+
+            /* link the cab into the list */
+            if (!link) *firstcab = cab;
+            else link->base.next = (struct mscabd_cabinet *) cab;
+            link = cab;
+
+            /* cause the search to restart after this cab's data. */
+            offset = caboff + (off_t) cablen_u32;
+
+#if !LARGEFILE_SUPPORT
+            /* detect 32-bit off_t overflow */
+            if (offset < caboff) {
+              sys->message(fh, largefile_msg);
+              return MSPACK_ERR_OK;
+            }
+#endif        
+          }
+        }
+
+        /* restart search */
+        if (offset >= flen) return MSPACK_ERR_OK;
+        if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
+          return MSPACK_ERR_SEEK;
+        }
+        length = 0;
+        p = pend;
+        state = 0;
+        break;
+
+      /* for bytes 4-7 and 12-15, just advance state/pointer */
+      default:
+        p++, state++;
+      } /* switch(state) */
+    } /* for (... p < pend ...) */
+  } /* for (... offset < length ...) */
+
+  if (false_cabs) {
+    D(("%d false cabinets found", false_cabs))
+  }
+
+  return MSPACK_ERR_OK;
+}
+                                             
+/***************************************
+ * CABD_MERGE, CABD_PREPEND, CABD_APPEND
+ ***************************************
+ * joins cabinets together, also merges split folders between these two
+ * cabinets only. This includes freeing the duplicate folder and file(s)
+ * and allocating a further mscabd_folder_data structure to append to the
+ * merged folder's data parts list.
+ */
+static int cabd_prepend(struct mscab_decompressor *base,
+                        struct mscabd_cabinet *cab,
+                        struct mscabd_cabinet *prevcab)
+{
+  return cabd_merge(base, prevcab, cab);
+}
+
+static int cabd_append(struct mscab_decompressor *base,
+                        struct mscabd_cabinet *cab,
+                        struct mscabd_cabinet *nextcab)
+{
+  return cabd_merge(base, cab, nextcab);
+}
+
+static int cabd_merge(struct mscab_decompressor *base,
+                      struct mscabd_cabinet *lcab,
+                      struct mscabd_cabinet *rcab)
+{
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  struct mscabd_folder_data *data, *ndata;
+  struct mscabd_folder_p *lfol, *rfol;
+  struct mscabd_file *fi, *rfi, *lfi;
+  struct mscabd_cabinet *cab;
+  struct mspack_system *sys;
+
+  if (!self) return MSPACK_ERR_ARGS;
+  sys = self->system;
+
+  /* basic args check */
+  if (!lcab || !rcab || (lcab == rcab)) {
+    D(("lcab NULL, rcab NULL or lcab = rcab"))
+    return self->error = MSPACK_ERR_ARGS;
+  }
+
+  /* check there's not already a cabinet attached */
+  if (lcab->nextcab || rcab->prevcab) {
+    D(("cabs already joined"))
+    return self->error = MSPACK_ERR_ARGS;
+  }
+
+  /* do not create circular cabinet chains */
+  for (cab = lcab->prevcab; cab; cab = cab->prevcab) {
+    if (cab == rcab) {D(("circular!")) return self->error = MSPACK_ERR_ARGS;}
+  }
+  for (cab = rcab->nextcab; cab; cab = cab->nextcab) {
+    if (cab == lcab) {D(("circular!")) return self->error = MSPACK_ERR_ARGS;}
+  }
+
+  /* warn about odd set IDs or indices */
+  if (lcab->set_id != rcab->set_id) {
+    sys->message(NULL, "WARNING; merged cabinets with differing Set IDs.");
+  }
+
+  if (lcab->set_index > rcab->set_index) {
+    sys->message(NULL, "WARNING; merged cabinets with odd order.");
+  }
+
+  /* merging the last folder in lcab with the first folder in rcab */
+  lfol = (struct mscabd_folder_p *) lcab->folders;
+  rfol = (struct mscabd_folder_p *) rcab->folders;
+  while (lfol->base.next) lfol = (struct mscabd_folder_p *) lfol->base.next;
+
+  /* do we need to merge folders? */
+  if (!lfol->merge_next && !rfol->merge_prev) {
+    /* no, at least one of the folders is not for merging */
+
+    /* attach cabs */
+    lcab->nextcab = rcab;
+    rcab->prevcab = lcab;
+
+    /* attach folders */
+    lfol->base.next = (struct mscabd_folder *) rfol;
+
+    /* attach files */
+    fi = lcab->files;
+    while (fi->next) fi = fi->next;
+    fi->next = rcab->files;
+  }
+  else {
+    /* folder merge required - do the files match? */
+    if (! cabd_can_merge_folders(sys, lfol, rfol)) {
+      return self->error = MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* allocate a new folder data structure */
+    if (!(data = (struct mscabd_folder_data *) sys->alloc(sys, sizeof(struct mscabd_folder_data)))) {
+      return self->error = MSPACK_ERR_NOMEMORY;
+    }
+
+    /* attach cabs */
+    lcab->nextcab = rcab;
+    rcab->prevcab = lcab;
+
+    /* append rfol's data to lfol */
+    ndata = &lfol->data;
+    while (ndata->next) ndata = ndata->next;
+    ndata->next = data;
+    *data = rfol->data;
+    rfol->data.next = NULL;
+
+    /* lfol becomes rfol.
+     * NOTE: special case, don't merge if rfol is merge prev and next,
+     * rfol->merge_next is going to be deleted, so keep lfol's version
+     * instead */
+    lfol->base.num_blocks += rfol->base.num_blocks - 1;
+    if ((rfol->merge_next == NULL) ||
+        (rfol->merge_next->folder != (struct mscabd_folder *) rfol))
+    {
+      lfol->merge_next = rfol->merge_next;
+    }
+
+    /* attach the rfol's folder (except the merge folder) */
+    while (lfol->base.next) lfol = (struct mscabd_folder_p *) lfol->base.next;
+    lfol->base.next = rfol->base.next;
+
+    /* free disused merge folder */
+    sys->free(rfol);
+
+    /* attach rfol's files */
+    fi = lcab->files;
+    while (fi->next) fi = fi->next;
+    fi->next = rcab->files;
+
+    /* delete all files from rfol's merge folder */
+    lfi = NULL;
+    for (fi = lcab->files; fi ; fi = rfi) {
+      rfi = fi->next;
+      /* if file's folder matches the merge folder, unlink and free it */
+      if (fi->folder == (struct mscabd_folder *) rfol) {
+        if (lfi) lfi->next = rfi; else lcab->files = rfi;
+        sys->free(fi->filename);
+        sys->free(fi);
+      }
+      else lfi = fi;
+    }
+  }
+
+  /* all done! fix files and folders pointers in all cabs so they all
+   * point to the same list  */
+  for (cab = lcab->prevcab; cab; cab = cab->prevcab) {
+    cab->files   = lcab->files;
+    cab->folders = lcab->folders;
+  }
+
+  for (cab = lcab->nextcab; cab; cab = cab->nextcab) {
+    cab->files   = lcab->files;
+    cab->folders = lcab->folders;
+  }
+
+  return self->error = MSPACK_ERR_OK;
+}
+
+/* decides if two folders are OK to merge */
+static int cabd_can_merge_folders(struct mspack_system *sys,
+                                  struct mscabd_folder_p *lfol,
+                                  struct mscabd_folder_p *rfol)
+{
+    struct mscabd_file *lfi, *rfi, *l, *r;
+    int matching = 1;
+
+    /* check that both folders use the same compression method/settings */
+    if (lfol->base.comp_type != rfol->base.comp_type) {
+        D(("folder merge: compression type mismatch"))
+        return 0;
+    }
+
+    /* check there are not too many data blocks after merging */
+    if ((lfol->base.num_blocks + rfol->base.num_blocks) > CAB_FOLDERMAX) {
+        D(("folder merge: too many data blocks in merged folders"))
+        return 0;
+    }
+
+    if (!(lfi = lfol->merge_next) || !(rfi = rfol->merge_prev)) {
+        D(("folder merge: one cabinet has no files to merge"))
+        return 0;
+    }
+
+    /* for all files in lfol (which is the last folder in whichever cab and
+     * only has files to merge), compare them to the files from rfol. They
+     * should be identical in number and order. to verify this, check the
+     * offset and length of each file. */
+    for (l=lfi, r=rfi; l; l=l->next, r=r->next) {
+        if (!r || (l->offset != r->offset) || (l->length != r->length)) {
+            matching = 0;
+            break;
+        }
+    }
+
+    if (matching) return 1;
+
+    /* if rfol does not begin with an identical copy of the files in lfol, make
+     * make a judgement call; if at least ONE file from lfol is in rfol, allow
+     * the merge with a warning about missing files. */
+    matching = 0;
+    for (l = lfi; l; l = l->next) {
+        for (r = rfi; r; r = r->next) {
+            if (l->offset == r->offset && l->length == r->length) break;
+        }
+        if (r) matching = 1; else sys->message(NULL,
+            "WARNING; merged file %s not listed in both cabinets", l->filename);
+    }
+    return matching;
+}
+
+
+/***************************************
+ * CABD_EXTRACT
+ ***************************************
+ * extracts a file from a cabinet
+ */
+static int cabd_extract(struct mscab_decompressor *base,
+                        struct mscabd_file *file, const char *filename)
+{
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  struct mscabd_folder_p *fol;
+  struct mspack_system *sys;
+  struct mspack_file *fh;
+  off_t filelen;
+
+  if (!self) return MSPACK_ERR_ARGS;
+  if (!file) return self->error = MSPACK_ERR_ARGS;
+
+  sys = self->system;
+  fol = (struct mscabd_folder_p *) file->folder;
+
+  /* if offset is beyond 2GB, nothing can be extracted */
+  if (file->offset > CAB_LENGTHMAX) {
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* if file claims to go beyond 2GB either error out,
+   * or in salvage mode reduce file length so it fits 2GB limit
+   */
+  filelen = file->length;
+  if (filelen > CAB_LENGTHMAX || (file->offset + filelen) > CAB_LENGTHMAX) {
+    if (self->salvage) {
+      filelen = CAB_LENGTHMAX - file->offset;
+    }
+    else {
+      return self->error = MSPACK_ERR_DATAFORMAT;
+    }
+  }
+
+  /* extraction impossible if no folder, or folder needs predecessor */
+  if (!fol || fol->merge_prev) {
+    sys->message(NULL, "ERROR; file \"%s\" cannot be extracted, "
+                 "cabinet set is incomplete", file->filename);
+    return self->error = MSPACK_ERR_DECRUNCH;
+  }
+
+  /* if file goes beyond what can be decoded, given an error.
+   * In salvage mode, don't assume block sizes, just try decoding
+   */
+  if (!self->salvage) {
+    off_t maxlen = fol->base.num_blocks * CAB_BLOCKMAX;
+    if ((file->offset + filelen) > maxlen) {
+      sys->message(NULL, "ERROR; file \"%s\" cannot be extracted, "
+                   "cabinet set is incomplete", file->filename);
+      return self->error = MSPACK_ERR_DECRUNCH;
+    }
+  }
+
+  /* allocate generic decompression state */
+  if (!self->d) {
+    self->d = (struct mscabd_decompress_state *) sys->alloc(sys, sizeof(struct mscabd_decompress_state));
+    if (!self->d) return self->error = MSPACK_ERR_NOMEMORY;
+    self->d->folder     = NULL;
+    self->d->data       = NULL;
+    self->d->sys        = *sys;
+    self->d->sys.read   = &cabd_sys_read;
+    self->d->sys.write  = &cabd_sys_write;
+    self->d->state      = NULL;
+    self->d->infh       = NULL;
+    self->d->incab      = NULL;
+  }
+
+  /* do we need to change folder or reset the current folder? */
+  if ((self->d->folder != fol) || (self->d->offset > file->offset) ||
+      !self->d->state)
+  {
+    /* free any existing decompressor */
+    cabd_free_decomp(self);
+
+    /* do we need to open a new cab file? */
+    if (!self->d->infh || (fol->data.cab != self->d->incab)) {
+      /* close previous file handle if from a different cab */
+      if (self->d->infh) sys->close(self->d->infh);
+      self->d->incab = fol->data.cab;
+      self->d->infh = sys->open(sys, fol->data.cab->base.filename,
+                                MSPACK_SYS_OPEN_READ);
+      if (!self->d->infh) return self->error = MSPACK_ERR_OPEN;
+    }
+    /* seek to start of data blocks */
+    if (sys->seek(self->d->infh, fol->data.offset, MSPACK_SYS_SEEK_START)) {
+      return self->error = MSPACK_ERR_SEEK;
+    }
+
+    /* set up decompressor */
+    if (cabd_init_decomp(self, (unsigned int) fol->base.comp_type)) {
+      return self->error;
+    }
+
+    /* initialise new folder state */
+    self->d->folder = fol;
+    self->d->data   = &fol->data;
+    self->d->offset = 0;
+    self->d->block  = 0;
+    self->d->outlen = 0;
+    self->d->i_ptr = self->d->i_end = &self->d->input[0];
+
+    /* read_error lasts for the lifetime of a decompressor */
+    self->read_error = MSPACK_ERR_OK;
+  }
+
+  /* open file for output */
+  if (!(fh = sys->open(sys, filename, MSPACK_SYS_OPEN_WRITE))) {
+    return self->error = MSPACK_ERR_OPEN;
+  }
+
+  self->error = MSPACK_ERR_OK;
+
+  /* if file has more than 0 bytes */
+  if (filelen) {
+    off_t bytes;
+    int error;
+    /* get to correct offset.
+     * - use NULL fh to say 'no writing' to cabd_sys_write()
+     * - if cabd_sys_read() has an error, it will set self->read_error
+     *   and pass back MSPACK_ERR_READ
+     */
+    self->d->outfh = NULL;
+    if ((bytes = file->offset - self->d->offset)) {
+        error = self->d->decompress(self->d->state, bytes);
+        self->error = (error == MSPACK_ERR_READ) ? self->read_error : error;
+    }
+
+    /* if getting to the correct offset was error free, unpack file */
+    if (!self->error) {
+      self->d->outfh = fh;
+      error = self->d->decompress(self->d->state, filelen);
+      self->error = (error == MSPACK_ERR_READ) ? self->read_error : error;
+    }
+  }
+
+  /* close output file */
+  sys->close(fh);
+  self->d->outfh = NULL;
+
+  return self->error;
+}
+
+/***************************************
+ * CABD_INIT_DECOMP, CABD_FREE_DECOMP
+ ***************************************
+ * cabd_init_decomp initialises decompression state, according to which
+ * decompression method was used. relies on self->d->folder being the same
+ * as when initialised.
+ *
+ * cabd_free_decomp frees decompression state, according to which method
+ * was used.
+ */
+static int cabd_init_decomp(struct mscab_decompressor_p *self, unsigned int ct)
+{
+  struct mspack_file *fh = (struct mspack_file *) self;
+
+  self->d->comp_type = ct;
+
+  switch (ct & cffoldCOMPTYPE_MASK) {
+  case cffoldCOMPTYPE_NONE:
+    self->d->decompress = (int (*)(void *, off_t)) &noned_decompress;
+    self->d->state = noned_init(&self->d->sys, fh, fh, self->buf_size);
+    break;
+  case cffoldCOMPTYPE_MSZIP:
+    self->d->decompress = (int (*)(void *, off_t)) &mszipd_decompress;
+    self->d->state = mszipd_init(&self->d->sys, fh, fh, self->buf_size,
+                                 self->fix_mszip);
+    break;
+  case cffoldCOMPTYPE_QUANTUM:
+    self->d->decompress = (int (*)(void *, off_t)) &qtmd_decompress;
+    self->d->state = qtmd_init(&self->d->sys, fh, fh, (int) (ct >> 8) & 0x1f,
+                               self->buf_size);
+    break;
+  case cffoldCOMPTYPE_LZX:
+    self->d->decompress = (int (*)(void *, off_t)) &lzxd_decompress;
+    self->d->state = lzxd_init(&self->d->sys, fh, fh, (int) (ct >> 8) & 0x1f, 0,
+                               self->buf_size, (off_t)0,0);
+    break;
+  default:
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+  return self->error = (self->d->state) ? MSPACK_ERR_OK : MSPACK_ERR_NOMEMORY;
+}
+
+static void cabd_free_decomp(struct mscab_decompressor_p *self) {
+  if (!self || !self->d || !self->d->state) return;
+
+  switch (self->d->comp_type & cffoldCOMPTYPE_MASK) {
+  case cffoldCOMPTYPE_NONE:    noned_free((struct noned_state *) self->d->state);   break;
+  case cffoldCOMPTYPE_MSZIP:   mszipd_free((struct mszipd_stream *) self->d->state);  break;
+  case cffoldCOMPTYPE_QUANTUM: qtmd_free((struct qtmd_stream *) self->d->state);    break;
+  case cffoldCOMPTYPE_LZX:     lzxd_free((struct lzxd_stream *) self->d->state);    break;
+  }
+  self->d->decompress = NULL;
+  self->d->state      = NULL;
+}
+
+/***************************************
+ * CABD_SYS_READ, CABD_SYS_WRITE
+ ***************************************
+ * cabd_sys_read is the internal reader function which the decompressors
+ * use. will read data blocks (and merge split blocks) from the cabinet
+ * and serve the read bytes to the decompressors
+ *
+ * cabd_sys_write is the internal writer function which the decompressors
+ * use. it either writes data to disk (self->d->outfh) with the real
+ * sys->write() function, or does nothing with the data when
+ * self->d->outfh == NULL. advances self->d->offset
+ */
+static int cabd_sys_read(struct mspack_file *file, void *buffer, int bytes) {
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) file;
+  unsigned char *buf = (unsigned char *) buffer;
+  struct mspack_system *sys = self->system;
+  int avail, todo, outlen, ignore_cksum, ignore_blocksize;
+
+  ignore_cksum = self->salvage ||
+    (self->fix_mszip && 
+     ((self->d->comp_type & cffoldCOMPTYPE_MASK) == cffoldCOMPTYPE_MSZIP));
+  ignore_blocksize = self->salvage;
+
+  todo = bytes;
+  while (todo > 0) {
+    avail = self->d->i_end - self->d->i_ptr;
+
+    /* if out of input data, read a new block */
+    if (avail) {
+      /* copy as many input bytes available as possible */
+      if (avail > todo) avail = todo;
+      sys->copy(self->d->i_ptr, buf, (size_t) avail);
+      self->d->i_ptr += avail;
+      buf  += avail;
+      todo -= avail;
+    }
+    else {
+      /* out of data, read a new block */
+
+      /* check if we're out of input blocks, advance block counter */
+      if (self->d->block++ >= self->d->folder->base.num_blocks) {
+        if (!self->salvage) {
+          self->read_error = MSPACK_ERR_DATAFORMAT;
+        }
+        else {
+          D(("Ran out of CAB input blocks prematurely"))
+        }
+        break;
+      }
+
+      /* read a block */
+      self->read_error = cabd_sys_read_block(sys, self->d, &outlen,
+        ignore_cksum, ignore_blocksize);
+      if (self->read_error) return -1;
+      self->d->outlen += outlen;
+
+      /* special Quantum hack -- trailer byte to allow the decompressor
+       * to realign itself. CAB Quantum blocks, unlike LZX blocks, can have
+       * anything from 0 to 4 trailing null bytes. */
+      if ((self->d->comp_type & cffoldCOMPTYPE_MASK)==cffoldCOMPTYPE_QUANTUM) {
+        *self->d->i_end++ = 0xFF;
+      }
+
+      /* is this the last block? */
+      if (self->d->block >= self->d->folder->base.num_blocks) {
+        if ((self->d->comp_type & cffoldCOMPTYPE_MASK) == cffoldCOMPTYPE_LZX) {
+          /* special LZX hack -- on the last block, inform LZX of the
+           * size of the output data stream. */
+          lzxd_set_output_length((struct lzxd_stream *) self->d->state, self->d->outlen);
+        }
+      }
+    } /* if (avail) */
+  } /* while (todo > 0) */
+  return bytes - todo;
+}
+
+static int cabd_sys_write(struct mspack_file *file, void *buffer, int bytes) {
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) file;
+  self->d->offset += bytes;
+  if (self->d->outfh) {
+    return self->system->write(self->d->outfh, buffer, bytes);
+  }
+  return bytes;
+}
+
+/***************************************
+ * CABD_SYS_READ_BLOCK
+ ***************************************
+ * reads a whole data block from a cab file. the block may span more than
+ * one cab file, if it does then the fragments will be reassembled
+ */
+static int cabd_sys_read_block(struct mspack_system *sys,
+                               struct mscabd_decompress_state *d,
+                               int *out, int ignore_cksum,
+                               int ignore_blocksize)
+{
+  unsigned char hdr[cfdata_SIZEOF];
+  unsigned int cksum;
+  int len, full_len;
+
+  /* reset the input block pointer and end of block pointer */
+  d->i_ptr = d->i_end = &d->input[0];
+
+  do {
+    /* read the block header */
+    if (sys->read(d->infh, &hdr[0], cfdata_SIZEOF) != cfdata_SIZEOF) {
+      return MSPACK_ERR_READ;
+    }
+
+    /* skip any reserved block headers */
+    if (d->data->cab->block_resv &&
+        sys->seek(d->infh, (off_t) d->data->cab->block_resv,
+                  MSPACK_SYS_SEEK_CUR))
+    {
+      return MSPACK_ERR_SEEK;
+    }
+
+    /* blocks must not be over CAB_INPUTMAX in size */
+    len = EndGetI16(&hdr[cfdata_CompressedSize]);
+    full_len = (d->i_end - d->i_ptr) + len; /* include cab-spanning blocks */
+    if (full_len > CAB_INPUTMAX) {
+      D(("block size %d > CAB_INPUTMAX", full_len));
+      /* in salvage mode, blocks can be 65535 bytes but no more than that */
+      if (!ignore_blocksize || full_len > CAB_INPUTMAX_SALVAGE) {
+          return MSPACK_ERR_DATAFORMAT;
+      }
+    }
+
+     /* blocks must not expand to more than CAB_BLOCKMAX */
+    if (EndGetI16(&hdr[cfdata_UncompressedSize]) > CAB_BLOCKMAX) {
+      D(("block size > CAB_BLOCKMAX"))
+      if (!ignore_blocksize) return MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* read the block data */
+    if (sys->read(d->infh, d->i_end, len) != len) {
+      return MSPACK_ERR_READ;
+    }
+
+    /* perform checksum test on the block (if one is stored) */
+    if ((cksum = EndGetI32(&hdr[cfdata_CheckSum]))) {
+      unsigned int sum2 = cabd_checksum(d->i_end, (unsigned int) len, 0);
+      if (cabd_checksum(&hdr[4], 4, sum2) != cksum) {
+        if (!ignore_cksum) return MSPACK_ERR_CHECKSUM;
+        sys->message(d->infh, "WARNING; bad block checksum found");
+      }
+    }
+
+    /* advance end of block pointer to include newly read data */
+    d->i_end += len;
+
+    /* uncompressed size == 0 means this block was part of a split block
+     * and it continues as the first block of the next cabinet in the set.
+     * otherwise, this is the last part of the block, and no more block
+     * reading needs to be done.
+     */
+    /* EXIT POINT OF LOOP -- uncompressed size != 0 */
+    if ((*out = EndGetI16(&hdr[cfdata_UncompressedSize]))) {
+      return MSPACK_ERR_OK;
+    }
+
+    /* otherwise, advance to next cabinet */
+
+    /* close current file handle */
+    sys->close(d->infh);
+    d->infh = NULL;
+
+    /* advance to next member in the cabinet set */
+    if (!(d->data = d->data->next)) {
+      sys->message(d->infh, "WARNING; ran out of cabinets in set. Are any missing?");
+      return MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* open next cab file */
+    d->incab = d->data->cab;
+    if (!(d->infh = sys->open(sys, d->incab->base.filename,
+                              MSPACK_SYS_OPEN_READ)))
+    {
+      return MSPACK_ERR_OPEN;
+    }
+
+    /* seek to start of data blocks */
+    if (sys->seek(d->infh, d->data->offset, MSPACK_SYS_SEEK_START)) {
+      return MSPACK_ERR_SEEK;
+    }
+  } while (1);
+
+  /* not reached */
+  return MSPACK_ERR_OK;
+}
+
+static unsigned int cabd_checksum(unsigned char *data, unsigned int bytes,
+                                  unsigned int cksum)
+{
+  unsigned int len, ul = 0;
+
+  for (len = bytes >> 2; len--; data += 4) {
+    cksum ^= ((data[0]) | (data[1]<<8) | (data[2]<<16) | (data[3]<<24));
+  }
+
+  switch (bytes & 3) {
+  case 3: ul |= *data++ << 16; /*@fallthrough@*/
+  case 2: ul |= *data++ <<  8; /*@fallthrough@*/
+  case 1: ul |= *data;
+  }
+  cksum ^= ul;
+
+  return cksum;
+}
+
+/***************************************
+ * NONED_INIT, NONED_DECOMPRESS, NONED_FREE
+ ***************************************
+ * the "not compressed" method decompressor
+ */
+struct noned_state {
+  struct mspack_system *sys;
+  struct mspack_file *i;
+  struct mspack_file *o;
+  unsigned char *buf;
+  int bufsize;
+};
+
+static struct noned_state *noned_init(struct mspack_system *sys,
+                                      struct mspack_file *in,
+                                      struct mspack_file *out,
+                                      int bufsize)
+{
+  struct noned_state *state = (struct noned_state *) sys->alloc(sys, sizeof(struct noned_state));
+  unsigned char *buf = (unsigned char *) sys->alloc(sys, (size_t) bufsize);
+  if (state && buf) {
+    state->sys     = sys;
+    state->i       = in;
+    state->o       = out;
+    state->buf     = buf;
+    state->bufsize = bufsize;
+  }
+  else {
+    sys->free(buf);
+    sys->free(state);
+    state = NULL;
+  }
+  return state;
+}
+
+static int noned_decompress(struct noned_state *s, off_t bytes) {
+  int run;
+  while (bytes > 0) {
+    run = (bytes > s->bufsize) ? s->bufsize : (int) bytes;
+    if (s->sys->read(s->i, &s->buf[0], run) != run) return MSPACK_ERR_READ;
+    if (s->sys->write(s->o, &s->buf[0], run) != run) return MSPACK_ERR_WRITE;
+    bytes -= run;
+  }
+  return MSPACK_ERR_OK;
+}
+
+static void noned_free(struct noned_state *state) {
+  struct mspack_system *sys;
+  if (state) {
+    sys = state->sys;
+    sys->free(state->buf);
+    sys->free(state);
+  }
+}
+
+
+/***************************************
+ * CABD_PARAM
+ ***************************************
+ * allows a parameter to be set
+ */
+static int cabd_param(struct mscab_decompressor *base, int param, int value) {
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  if (!self) return MSPACK_ERR_ARGS;
+
+  switch (param) {
+  case MSCABD_PARAM_SEARCHBUF:
+    if (value < 4) return MSPACK_ERR_ARGS;
+    self->searchbuf_size = value;
+    break;
+  case MSCABD_PARAM_FIXMSZIP:
+    self->fix_mszip = value;
+    break;
+  case MSCABD_PARAM_DECOMPBUF:
+    if (value < 4) return MSPACK_ERR_ARGS;
+    self->buf_size = value;
+    break;
+  case MSCABD_PARAM_SALVAGE:
+    self->salvage = value;
+    break;
+  default:
+    return MSPACK_ERR_ARGS;
+  }
+  return MSPACK_ERR_OK;
+}
+
+/***************************************
+ * CABD_ERROR
+ ***************************************
+ * returns the last error that occurred
+ */
+static int cabd_error(struct mscab_decompressor *base) {
+  struct mscab_decompressor_p *self = (struct mscab_decompressor_p *) base;
+  return (self) ? self->error : MSPACK_ERR_ARGS;
+}
diff --git a/utils/rbutilqt/mspack/chm.h b/utils/rbutilqt/mspack/chm.h
new file mode 100644
index 0000000000..4b19f1505a
--- /dev/null
+++ b/utils/rbutilqt/mspack/chm.h
@@ -0,0 +1,122 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_CHM_H
+#define MSPACK_CHM_H 1
+
+#include "lzx.h"
+
+/* generic CHM definitions */
+
+#define chmhead_Signature   (0x0000)
+#define chmhead_Version     (0x0004)
+#define chmhead_HeaderLen   (0x0008)
+#define chmhead_Unknown1    (0x000C)
+#define chmhead_Timestamp   (0x0010)
+#define chmhead_LanguageID  (0x0014)
+#define chmhead_GUID1       (0x0018)
+#define chmhead_GUID2       (0x0028)
+#define chmhead_SIZEOF      (0x0038)
+
+#define chmhst_OffsetHS0    (0x0000)
+#define chmhst_LengthHS0    (0x0008)
+#define chmhst_OffsetHS1    (0x0010)
+#define chmhst_LengthHS1    (0x0018)
+#define chmhst_SIZEOF       (0x0020)
+#define chmhst3_OffsetCS0   (0x0020)
+#define chmhst3_SIZEOF      (0x0028)
+
+#define chmhs0_Unknown1     (0x0000)
+#define chmhs0_Unknown2     (0x0004)
+#define chmhs0_FileLen      (0x0008)
+#define chmhs0_Unknown3     (0x0010)
+#define chmhs0_Unknown4     (0x0014)
+#define chmhs0_SIZEOF       (0x0018)
+
+#define chmhs1_Signature    (0x0000)
+#define chmhs1_Version      (0x0004)
+#define chmhs1_HeaderLen    (0x0008)
+#define chmhs1_Unknown1     (0x000C)
+#define chmhs1_ChunkSize    (0x0010)
+#define chmhs1_Density      (0x0014)
+#define chmhs1_Depth        (0x0018)
+#define chmhs1_IndexRoot    (0x001C)
+#define chmhs1_FirstPMGL    (0x0020)
+#define chmhs1_LastPMGL     (0x0024)
+#define chmhs1_Unknown2     (0x0028)
+#define chmhs1_NumChunks    (0x002C)
+#define chmhs1_LanguageID   (0x0030)
+#define chmhs1_GUID         (0x0034)
+#define chmhs1_Unknown3     (0x0044)
+#define chmhs1_Unknown4     (0x0048)
+#define chmhs1_Unknown5     (0x004C)
+#define chmhs1_Unknown6     (0x0050)
+#define chmhs1_SIZEOF       (0x0054)
+
+#define pmgl_Signature      (0x0000)
+#define pmgl_QuickRefSize   (0x0004)
+#define pmgl_Unknown1       (0x0008)
+#define pmgl_PrevChunk      (0x000C)
+#define pmgl_NextChunk      (0x0010)
+#define pmgl_Entries        (0x0014)
+#define pmgl_headerSIZEOF   (0x0014)
+
+#define pmgi_Signature      (0x0000)
+#define pmgi_QuickRefSize   (0x0004)
+#define pmgi_Entries        (0x0008)
+#define pmgi_headerSIZEOF   (0x000C)
+
+#define lzxcd_Length        (0x0000)
+#define lzxcd_Signature     (0x0004)
+#define lzxcd_Version       (0x0008)
+#define lzxcd_ResetInterval (0x000C)
+#define lzxcd_WindowSize    (0x0010)
+#define lzxcd_CacheSize     (0x0014)
+#define lzxcd_Unknown1      (0x0018)
+#define lzxcd_SIZEOF        (0x001C)
+
+#define lzxrt_Unknown1      (0x0000)
+#define lzxrt_NumEntries    (0x0004)
+#define lzxrt_EntrySize     (0x0008)
+#define lzxrt_TableOffset   (0x000C)
+#define lzxrt_UncompLen     (0x0010)
+#define lzxrt_CompLen       (0x0018)
+#define lzxrt_FrameLen      (0x0020)
+#define lzxrt_Entries       (0x0028)
+#define lzxrt_headerSIZEOF  (0x0028)
+
+/* CHM compression definitions */
+
+struct mschm_compressor_p {
+  struct mschm_compressor base;
+  struct mspack_system *system;
+  char *temp_file;
+  int use_temp_file;
+  int error;
+};
+
+/* CHM decompression definitions */
+struct mschmd_decompress_state {
+  struct mschmd_header *chm;         /* CHM file being decompressed          */
+  off_t offset;                      /* uncompressed offset within folder    */
+  off_t inoffset;                    /* offset in input file                 */
+  struct lzxd_stream *state;         /* LZX decompressor state               */
+  struct mspack_system sys;          /* special I/O code for decompressor    */
+  struct mspack_file *infh;          /* input file handle                    */
+  struct mspack_file *outfh;         /* output file handle                   */
+};
+
+struct mschm_decompressor_p {
+  struct mschm_decompressor base;
+  struct mspack_system *system;
+  struct mschmd_decompress_state *d;
+  int error;
+};
+
+#endif
diff --git a/utils/rbutilqt/mspack/chmc.c b/utils/rbutilqt/mspack/chmc.c
new file mode 100644
index 0000000000..b9a1d8856c
--- /dev/null
+++ b/utils/rbutilqt/mspack/chmc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* CHM compression implementation */
+
+#include "system-mspack.h"
+#include "chm.h"
+
+struct mschm_compressor *
+  mspack_create_chm_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_chm_compressor(struct mschm_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/chmd.c b/utils/rbutilqt/mspack/chmd.c
new file mode 100644
index 0000000000..6c8481db14
--- /dev/null
+++ b/utils/rbutilqt/mspack/chmd.c
@@ -0,0 +1,1377 @@
+/* This file is part of libmspack.
+ * (C) 2003-2018 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* CHM decompression implementation */
+
+#include "system-mspack.h"
+#include "chm.h"
+
+/* prototypes */
+static struct mschmd_header * chmd_open(
+  struct mschm_decompressor *base, const char *filename);
+static struct mschmd_header * chmd_fast_open(
+  struct mschm_decompressor *base, const char *filename);
+static struct mschmd_header *chmd_real_open(
+  struct mschm_decompressor *base, const char *filename, int entire);
+static void chmd_close(
+  struct mschm_decompressor *base, struct mschmd_header *chm);
+static int chmd_read_headers(
+  struct mspack_system *sys, struct mspack_file *fh,
+  struct mschmd_header *chm, int entire);
+static int chmd_fast_find(
+  struct mschm_decompressor *base, struct mschmd_header *chm,
+  const char *filename, struct mschmd_file *f_ptr, int f_size);
+static unsigned char *read_chunk(
+  struct mschm_decompressor_p *self, struct mschmd_header *chm,
+  struct mspack_file *fh, unsigned int chunk);
+static int search_chunk(
+  struct mschmd_header *chm, const unsigned char *chunk, const char *filename,
+  const unsigned char **result, const unsigned char **result_end);
+static inline int compare(
+  const char *s1, const char *s2, int l1, int l2);
+static int chmd_extract(
+  struct mschm_decompressor *base, struct mschmd_file *file,
+  const char *filename);
+static int chmd_sys_write(
+  struct mspack_file *file, void *buffer, int bytes);
+static int chmd_init_decomp(
+  struct mschm_decompressor_p *self, struct mschmd_file *file);
+static int read_reset_table(
+  struct mschm_decompressor_p *self, struct mschmd_sec_mscompressed *sec,
+  unsigned int entry, off_t *length_ptr, off_t *offset_ptr);
+static int read_spaninfo(
+  struct mschm_decompressor_p *self, struct mschmd_sec_mscompressed *sec,
+  off_t *length_ptr);
+static int find_sys_file(
+  struct mschm_decompressor_p *self, struct mschmd_sec_mscompressed *sec,
+  struct mschmd_file **f_ptr, const char *name);
+static unsigned char *read_sys_file(
+  struct mschm_decompressor_p *self, struct mschmd_file *file);
+static int chmd_error(
+  struct mschm_decompressor *base);
+static int read_off64(
+  off_t *var, unsigned char *mem, struct mspack_system *sys,
+  struct mspack_file *fh);
+
+/* filenames of the system files used for decompression.
+ * Content and ControlData are essential.
+ * ResetTable is preferred, but SpanInfo can be used if not available
+ */
+static const char *content_name  = "::DataSpace/Storage/MSCompressed/Content";
+static const char *control_name  = "::DataSpace/Storage/MSCompressed/ControlData";
+static const char *spaninfo_name = "::DataSpace/Storage/MSCompressed/SpanInfo";
+static const char *rtable_name   = "::DataSpace/Storage/MSCompressed/Transform/"
+  "{7FC28940-9D31-11D0-9B27-00A0C91E9C7C}/InstanceData/ResetTable";
+
+/***************************************
+ * MSPACK_CREATE_CHM_DECOMPRESSOR
+ ***************************************
+ * constructor
+ */
+struct mschm_decompressor *
+  mspack_create_chm_decompressor(struct mspack_system *sys)
+{
+  struct mschm_decompressor_p *self = NULL;
+
+  if (!sys) sys = mspack_default_system;
+  if (!mspack_valid_system(sys)) return NULL;
+
+  if ((self = (struct mschm_decompressor_p *) sys->alloc(sys, sizeof(struct mschm_decompressor_p)))) {
+    self->base.open       = &chmd_open;
+    self->base.close      = &chmd_close;
+    self->base.extract    = &chmd_extract;
+    self->base.last_error = &chmd_error;
+    self->base.fast_open  = &chmd_fast_open;
+    self->base.fast_find  = &chmd_fast_find;
+    self->system          = sys;
+    self->error           = MSPACK_ERR_OK;
+    self->d               = NULL;
+  }
+  return (struct mschm_decompressor *) self;
+}
+
+/***************************************
+ * MSPACK_DESTROY_CAB_DECOMPRESSOR
+ ***************************************
+ * destructor
+ */
+void mspack_destroy_chm_decompressor(struct mschm_decompressor *base) {
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+  if (self) {
+    struct mspack_system *sys = self->system;
+    if (self->d) {
+      if (self->d->infh)  sys->close(self->d->infh);
+      if (self->d->state) lzxd_free(self->d->state);
+      sys->free(self->d);
+    }
+    sys->free(self);
+  }
+}
+
+/***************************************
+ * CHMD_OPEN
+ ***************************************
+ * opens a file and tries to read it as a CHM file.
+ * Calls chmd_real_open() with entire=1.
+ */
+static struct mschmd_header *chmd_open(struct mschm_decompressor *base,
+                                       const char *filename)
+{
+  return chmd_real_open(base, filename, 1);
+}
+
+/***************************************
+ * CHMD_FAST_OPEN
+ ***************************************
+ * opens a file and tries to read it as a CHM file, but does not read
+ * the file headers. Calls chmd_real_open() with entire=0
+ */
+static struct mschmd_header *chmd_fast_open(struct mschm_decompressor *base,
+                                            const char *filename)
+{
+  return chmd_real_open(base, filename, 0);
+}
+
+/***************************************
+ * CHMD_REAL_OPEN
+ ***************************************
+ * the real implementation of chmd_open() and chmd_fast_open(). It simply
+ * passes the "entire" parameter to chmd_read_headers(), which will then
+ * either read all headers, or a bare mininum.
+ */
+static struct mschmd_header *chmd_real_open(struct mschm_decompressor *base,
+                                            const char *filename, int entire)
+{
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+  struct mschmd_header *chm = NULL;
+  struct mspack_system *sys;
+  struct mspack_file *fh;
+  int error;
+
+  if (!base) return NULL;
+  sys = self->system;
+
+  if ((fh = sys->open(sys, filename, MSPACK_SYS_OPEN_READ))) {
+    if ((chm = (struct mschmd_header *) sys->alloc(sys, sizeof(struct mschmd_header)))) {
+      chm->filename = filename;
+      error = chmd_read_headers(sys, fh, chm, entire);
+      if (error) {
+        /* if the error is DATAFORMAT, and there are some results, return
+         * partial results with a warning, rather than nothing */
+        if (error == MSPACK_ERR_DATAFORMAT && (chm->files || chm->sysfiles)) {
+          sys->message(fh, "WARNING; contents are corrupt");
+          error = MSPACK_ERR_OK;
+        }
+        else {
+          chmd_close(base, chm);
+          chm = NULL;
+        }
+      }
+      self->error = error;
+    }
+    else {
+      self->error = MSPACK_ERR_NOMEMORY;
+    }
+    sys->close(fh);
+  }
+  else {
+    self->error = MSPACK_ERR_OPEN;
+  }
+  return chm;
+}
+
+/***************************************
+ * CHMD_CLOSE
+ ***************************************
+ * frees all memory associated with a given mschmd_header
+ */
+static void chmd_close(struct mschm_decompressor *base,
+                       struct mschmd_header *chm)
+{
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+  struct mschmd_file *fi, *nfi;
+  struct mspack_system *sys;
+  unsigned int i;
+
+  if (!base) return;
+  sys = self->system;
+
+  self->error = MSPACK_ERR_OK;
+
+  /* free files */
+  for (fi = chm->files; fi; fi = nfi) {
+    nfi = fi->next;
+    sys->free(fi);
+  }
+  for (fi = chm->sysfiles; fi; fi = nfi) {
+    nfi = fi->next;
+    sys->free(fi);
+  }
+
+  /* if this CHM was being decompressed, free decompression state */
+  if (self->d && (self->d->chm == chm)) {
+    if (self->d->infh) sys->close(self->d->infh);
+    if (self->d->state) lzxd_free(self->d->state);
+    sys->free(self->d);
+    self->d = NULL;
+  }
+
+  /* if this CHM had a chunk cache, free it and contents */
+  if (chm->chunk_cache) {
+      for (i = 0; i < chm->num_chunks; i++) sys->free(chm->chunk_cache[i]);
+      sys->free(chm->chunk_cache);
+  }
+
+  sys->free(chm);
+}
+
+/***************************************
+ * CHMD_READ_HEADERS
+ ***************************************
+ * reads the basic CHM file headers. If the "entire" parameter is
+ * non-zero, all file entries will also be read. fills out a pre-existing
+ * mschmd_header structure, allocates memory for files as necessary
+ */
+
+/* The GUIDs found in CHM headers */
+static const unsigned char guids[32] = {
+  /* {7C01FD10-7BAA-11D0-9E0C-00A0-C922-E6EC} */
+  0x10, 0xFD, 0x01, 0x7C, 0xAA, 0x7B, 0xD0, 0x11,
+  0x9E, 0x0C, 0x00, 0xA0, 0xC9, 0x22, 0xE6, 0xEC,
+  /* {7C01FD11-7BAA-11D0-9E0C-00A0-C922-E6EC} */
+  0x11, 0xFD, 0x01, 0x7C, 0xAA, 0x7B, 0xD0, 0x11,
+  0x9E, 0x0C, 0x00, 0xA0, 0xC9, 0x22, 0xE6, 0xEC
+};
+
+/* reads an encoded integer into a variable; 7 bits of data per byte,
+ * the high bit is used to indicate that there is another byte */
+#define READ_ENCINT(var) do {                   \
+    (var) = 0;                                  \
+    do {                                        \
+        if (p >= end) goto chunk_end;           \
+        (var) = ((var) << 7) | (*p & 0x7F);     \
+    } while (*p++ & 0x80);                      \
+} while (0)
+
+static int chmd_read_headers(struct mspack_system *sys, struct mspack_file *fh,
+                             struct mschmd_header *chm, int entire)
+{
+  unsigned int section, name_len, x, errors, num_chunks;
+  unsigned char buf[0x54], *chunk = NULL, *name, *p, *end;
+  struct mschmd_file *fi, *link = NULL;
+  off_t offset, length;
+  int num_entries;
+
+  /* initialise pointers */
+  chm->files         = NULL;
+  chm->sysfiles      = NULL;
+  chm->chunk_cache   = NULL;
+  chm->sec0.base.chm = chm;
+  chm->sec0.base.id  = 0;
+  chm->sec1.base.chm = chm;
+  chm->sec1.base.id  = 1;
+  chm->sec1.content  = NULL;
+  chm->sec1.control  = NULL;
+  chm->sec1.spaninfo = NULL;
+  chm->sec1.rtable   = NULL;
+
+  /* read the first header */
+  if (sys->read(fh, &buf[0], chmhead_SIZEOF) != chmhead_SIZEOF) {
+    return MSPACK_ERR_READ;
+  }
+
+  /* check ITSF signature */
+  if (EndGetI32(&buf[chmhead_Signature]) != 0x46535449) {
+    return MSPACK_ERR_SIGNATURE;
+  }
+
+  /* check both header GUIDs */
+  if (memcmp(&buf[chmhead_GUID1], &guids[0], 32L) != 0) {
+    D(("incorrect GUIDs"))
+    return MSPACK_ERR_SIGNATURE;
+  }
+
+  chm->version   = EndGetI32(&buf[chmhead_Version]);
+  chm->timestamp = EndGetM32(&buf[chmhead_Timestamp]);
+  chm->language  = EndGetI32(&buf[chmhead_LanguageID]);
+  if (chm->version > 3) {
+    sys->message(fh, "WARNING; CHM version > 3");
+  }
+
+  /* read the header section table */
+  if (sys->read(fh, &buf[0], chmhst3_SIZEOF) != chmhst3_SIZEOF) {
+    return MSPACK_ERR_READ;
+  }
+
+  /* chmhst3_OffsetCS0 does not exist in version 1 or 2 CHM files.
+   * The offset will be corrected later, once HS1 is read.
+   */
+  if (read_off64(&offset,           &buf[chmhst_OffsetHS0],  sys, fh) ||
+      read_off64(&chm->dir_offset,  &buf[chmhst_OffsetHS1],  sys, fh) ||
+      read_off64(&chm->sec0.offset, &buf[chmhst3_OffsetCS0], sys, fh))
+  {
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* seek to header section 0 */
+  if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
+    return MSPACK_ERR_SEEK;
+  }
+
+  /* read header section 0 */
+  if (sys->read(fh, &buf[0], chmhs0_SIZEOF) != chmhs0_SIZEOF) {
+    return MSPACK_ERR_READ;
+  }
+  if (read_off64(&chm->length, &buf[chmhs0_FileLen], sys, fh)) {
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* seek to header section 1 */
+  if (sys->seek(fh, chm->dir_offset, MSPACK_SYS_SEEK_START)) {
+    return MSPACK_ERR_SEEK;
+  }
+
+  /* read header section 1 */
+  if (sys->read(fh, &buf[0], chmhs1_SIZEOF) != chmhs1_SIZEOF) {
+    return MSPACK_ERR_READ;
+  }
+
+  chm->dir_offset = sys->tell(fh);
+  chm->chunk_size = EndGetI32(&buf[chmhs1_ChunkSize]);
+  chm->density    = EndGetI32(&buf[chmhs1_Density]);
+  chm->depth      = EndGetI32(&buf[chmhs1_Depth]);
+  chm->index_root = EndGetI32(&buf[chmhs1_IndexRoot]);
+  chm->num_chunks = EndGetI32(&buf[chmhs1_NumChunks]);
+  chm->first_pmgl = EndGetI32(&buf[chmhs1_FirstPMGL]);
+  chm->last_pmgl  = EndGetI32(&buf[chmhs1_LastPMGL]);
+
+  if (chm->version < 3) {
+    /* versions before 3 don't have chmhst3_OffsetCS0 */
+    chm->sec0.offset = chm->dir_offset + (chm->chunk_size * chm->num_chunks);
+  }
+
+  /* check if content offset or file size is wrong */
+  if (chm->sec0.offset > chm->length) {
+    D(("content section begins after file has ended"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+  
+  /* ensure there are chunks and that chunk size is
+   * large enough for signature and num_entries */
+  if (chm->chunk_size < (pmgl_Entries + 2)) {
+    D(("chunk size not large enough"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+  if (chm->num_chunks == 0) {
+    D(("no chunks"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* The chunk_cache data structure is not great; large values for num_chunks
+   * or num_chunks*chunk_size can exhaust all memory. Until a better chunk
+   * cache is implemented, put arbitrary limits on num_chunks and chunk size.
+   */
+  if (chm->num_chunks > 100000) {
+    D(("more than 100,000 chunks"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+  if (chm->chunk_size > 8192) {
+    D(("chunk size over 8192 (get in touch if this is valid)"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+  if ((off_t)chm->chunk_size * (off_t)chm->num_chunks > chm->length) {
+    D(("chunks larger than entire file"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* common sense checks on header section 1 fields */
+  if (chm->chunk_size != 4096) {
+    sys->message(fh, "WARNING; chunk size is not 4096");
+  }
+  if (chm->first_pmgl != 0) {
+    sys->message(fh, "WARNING; first PMGL chunk is not zero");
+  }
+  if (chm->first_pmgl > chm->last_pmgl) {
+    D(("first pmgl chunk is after last pmgl chunk"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+  if (chm->index_root != 0xFFFFFFFF && chm->index_root >= chm->num_chunks) {
+    D(("index_root outside valid range"))
+    return MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* if we are doing a quick read, stop here! */
+  if (!entire) {
+    return MSPACK_ERR_OK;
+  }
+
+  /* seek to the first PMGL chunk, and reduce the number of chunks to read */
+  if ((x = chm->first_pmgl) != 0) {
+    if (sys->seek(fh,(off_t) (x * chm->chunk_size), MSPACK_SYS_SEEK_CUR)) {
+      return MSPACK_ERR_SEEK;
+    }
+  }
+  num_chunks = chm->last_pmgl - x + 1;
+
+  if (!(chunk = (unsigned char *) sys->alloc(sys, (size_t)chm->chunk_size))) {
+    return MSPACK_ERR_NOMEMORY;
+  }
+
+  /* read and process all chunks from FirstPMGL to LastPMGL */
+  errors = 0;
+  while (num_chunks--) {
+    /* read next chunk */
+    if (sys->read(fh, chunk, (int)chm->chunk_size) != (int)chm->chunk_size) {
+      sys->free(chunk);
+      return MSPACK_ERR_READ;
+    }
+
+    /* process only directory (PMGL) chunks */
+    if (EndGetI32(&chunk[pmgl_Signature]) != 0x4C474D50) continue;
+
+    if (EndGetI32(&chunk[pmgl_QuickRefSize]) < 2) {
+      sys->message(fh, "WARNING; PMGL quickref area is too small");
+    }
+    if (EndGetI32(&chunk[pmgl_QuickRefSize]) > 
+        (chm->chunk_size - pmgl_Entries))
+    {
+      sys->message(fh, "WARNING; PMGL quickref area is too large");
+    }
+
+    p = &chunk[pmgl_Entries];
+    end = &chunk[chm->chunk_size - 2];
+    num_entries = EndGetI16(end);
+
+    while (num_entries--) {
+      READ_ENCINT(name_len);
+      if (name_len > (unsigned int) (end - p)) goto chunk_end;
+      name = p; p += name_len;
+      READ_ENCINT(section);
+      READ_ENCINT(offset);
+      READ_ENCINT(length);
+
+      /* ignore blank or one-char (e.g. "/") filenames we'd return as blank */
+      if (name_len < 2 || !name[0] || !name[1]) continue;
+
+      /* empty files and directory names are stored as a file entry at
+       * offset 0 with length 0. We want to keep empty files, but not
+       * directory names, which end with a "/" */
+      if ((offset == 0) && (length == 0)) {
+        if ((name_len > 0) && (name[name_len-1] == '/')) continue;
+      }
+
+      if (section > 1) {
+        sys->message(fh, "invalid section number '%u'.", section);
+        continue;
+      }
+
+      if (!(fi = (struct mschmd_file *) sys->alloc(sys, sizeof(struct mschmd_file) + name_len + 1))) {
+        sys->free(chunk);
+        return MSPACK_ERR_NOMEMORY;
+      }
+
+      fi->next     = NULL;
+      fi->filename = (char *) &fi[1];
+      fi->section  = ((section == 0) ? (struct mschmd_section *) (&chm->sec0)
+                                     : (struct mschmd_section *) (&chm->sec1));
+      fi->offset   = offset;
+      fi->length   = length;
+      sys->copy(name, fi->filename, (size_t) name_len);
+      fi->filename[name_len] = '\0';
+
+      if (name[0] == ':' && name[1] == ':') {
+        /* system file */
+        if (name_len == 40 && memcmp(name, content_name, 40) == 0) {
+          chm->sec1.content = fi;
+        }
+        else if (name_len == 44 && memcmp(name, control_name, 44) == 0) {
+          chm->sec1.control = fi;
+        }
+        else if (name_len == 41 && memcmp(name, spaninfo_name, 41) == 0) {
+          chm->sec1.spaninfo = fi;
+        }
+        else if (name_len == 105 && memcmp(name, rtable_name, 105) == 0) {
+          chm->sec1.rtable = fi;
+        }
+        fi->next = chm->sysfiles;
+        chm->sysfiles = fi;
+      }
+      else {
+        /* normal file */
+        if (link) link->next = fi; else chm->files = fi;
+        link = fi;
+      }
+    }
+
+    /* this is reached either when num_entries runs out, or if
+     * reading data from the chunk reached a premature end of chunk */
+  chunk_end:
+    if (num_entries >= 0) {
+      D(("chunk ended before all entries could be read"))
+      errors++;
+    }
+
+  }
+  sys->free(chunk);
+  return (errors > 0) ? MSPACK_ERR_DATAFORMAT : MSPACK_ERR_OK;
+}
+
+/***************************************
+ * CHMD_FAST_FIND
+ ***************************************
+ * uses PMGI index chunks and quickref data to quickly locate a file
+ * directly from the on-disk index.
+ *
+ * TODO: protect against infinite loops in chunks (where pgml_NextChunk
+ * or a PMGI index entry point to an already visited chunk)
+ */
+static int chmd_fast_find(struct mschm_decompressor *base,
+                          struct mschmd_header *chm, const char *filename,
+                          struct mschmd_file *f_ptr, int f_size)
+{
+    struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+    struct mspack_system *sys;
+    struct mspack_file *fh;
+    /* p and end are initialised to prevent MSVC warning about "potentially"
+     * uninitialised usage. This is provably untrue, but MS won't fix:
+     * https://developercommunity.visualstudio.com/content/problem/363489/c4701-false-positive-warning.html */
+    const unsigned char *chunk, *p = NULL, *end = NULL;
+    int err = MSPACK_ERR_OK, result = -1;
+    unsigned int n, sec;
+
+    if (!self || !chm || !f_ptr || (f_size != sizeof(struct mschmd_file))) {
+        return MSPACK_ERR_ARGS;
+    }
+    sys = self->system;
+
+    /* clear the results structure */
+    memset(f_ptr, 0, f_size);
+
+    if (!(fh = sys->open(sys, chm->filename, MSPACK_SYS_OPEN_READ))) {
+        return MSPACK_ERR_OPEN;
+    }
+
+    /* go through PMGI chunk hierarchy to reach PMGL chunk */
+    if (chm->index_root < chm->num_chunks) {
+        n = chm->index_root;
+        for (;;) {
+            if (!(chunk = read_chunk(self, chm, fh, n))) {
+                sys->close(fh);
+                return self->error;
+            }
+
+            /* search PMGI/PMGL chunk. exit early if no entry found */
+            if ((result = search_chunk(chm, chunk, filename, &p, &end)) <= 0) {
+                break;
+            }
+
+            /* found result. loop around for next chunk if this is PMGI */
+            if (chunk[3] == 0x4C) break; else READ_ENCINT(n);
+        }
+    }
+    else {
+        /* PMGL chunks only, search from first_pmgl to last_pmgl */
+        for (n = chm->first_pmgl; n <= chm->last_pmgl;
+             n = EndGetI32(&chunk[pmgl_NextChunk]))
+        {
+            if (!(chunk = read_chunk(self, chm, fh, n))) {
+                err = self->error;
+                break;
+            }
+
+            /* search PMGL chunk. exit if file found */
+            if ((result = search_chunk(chm, chunk, filename, &p, &end)) > 0) {
+                break;
+            }
+
+            /* stop simple infinite loops: can't visit the same chunk twice */
+            if (n == EndGetI32(&chunk[pmgl_NextChunk])) {
+                break;
+            }
+        }
+    }
+
+    /* if we found a file, read it */
+    if (result > 0) {
+        READ_ENCINT(sec);
+        f_ptr->section  = (sec == 0) ? (struct mschmd_section *) &chm->sec0
+                                     : (struct mschmd_section *) &chm->sec1;
+        READ_ENCINT(f_ptr->offset);
+        READ_ENCINT(f_ptr->length);
+    }
+    else if (result < 0) {
+        err = MSPACK_ERR_DATAFORMAT;
+    }
+
+    sys->close(fh);
+    return self->error = err;
+
+ chunk_end:
+    D(("read beyond end of chunk entries"))
+    sys->close(fh);
+    return self->error = MSPACK_ERR_DATAFORMAT;
+}
+
+/* reads the given chunk into memory, storing it in a chunk cache
+ * so it doesn't need to be read from disk more than once
+ */
+static unsigned char *read_chunk(struct mschm_decompressor_p *self,
+                                 struct mschmd_header *chm,
+                                 struct mspack_file *fh,
+                                 unsigned int chunk_num)
+{
+    struct mspack_system *sys = self->system;
+    unsigned char *buf;
+
+    /* check arguments - most are already checked by chmd_fast_find */
+    if (chunk_num >= chm->num_chunks) return NULL;
+    
+    /* ensure chunk cache is available */
+    if (!chm->chunk_cache) {
+        size_t size = sizeof(unsigned char *) * chm->num_chunks;
+        if (!(chm->chunk_cache = (unsigned char **) sys->alloc(sys, size))) {
+            self->error = MSPACK_ERR_NOMEMORY;
+            return NULL;
+        }
+        memset(chm->chunk_cache, 0, size);
+    }
+
+    /* try to answer out of chunk cache */
+    if (chm->chunk_cache[chunk_num]) return chm->chunk_cache[chunk_num];
+
+    /* need to read chunk - allocate memory for it */
+    if (!(buf = (unsigned char *) sys->alloc(sys, chm->chunk_size))) {
+        self->error = MSPACK_ERR_NOMEMORY;
+        return NULL;
+    }
+
+    /* seek to block and read it */
+    if (sys->seek(fh, (off_t) (chm->dir_offset + (chunk_num * chm->chunk_size)),
+                      MSPACK_SYS_SEEK_START))
+    {
+        self->error = MSPACK_ERR_SEEK;
+        sys->free(buf);
+        return NULL;
+    }
+    if (sys->read(fh, buf, (int)chm->chunk_size) != (int)chm->chunk_size) {
+        self->error = MSPACK_ERR_READ;
+        sys->free(buf);
+        return NULL;
+    }
+
+    /* check the signature. Is is PMGL or PMGI? */
+    if (!((buf[0] == 0x50) && (buf[1] == 0x4D) && (buf[2] == 0x47) &&
+          ((buf[3] == 0x4C) || (buf[3] == 0x49))))
+    {
+        self->error = MSPACK_ERR_SEEK;
+        sys->free(buf);
+        return NULL;
+    }
+
+    /* all OK. Store chunk in cache and return it */
+    return chm->chunk_cache[chunk_num] = buf;
+}
+
+/* searches a PMGI/PMGL chunk for a given filename entry. Returns -1 on
+ * data format error, 0 if entry definitely not found, 1 if entry
+ * found. In the latter case, *result and *result_end are set pointing
+ * to that entry's data (either the "next chunk" ENCINT for a PMGI or
+ * the section, offset and length ENCINTs for a PMGL).
+ *
+ * In the case of PMGL chunks, the entry has definitely been
+ * found. In the case of PMGI chunks, the entry which points to the
+ * chunk that may eventually contain that entry has been found.
+ */
+static int search_chunk(struct mschmd_header *chm,
+                        const unsigned char *chunk,
+                        const char *filename,
+                        const unsigned char **result,
+                        const unsigned char **result_end)
+{
+    const unsigned char *start, *end, *p;
+    unsigned int qr_size, num_entries, qr_entries, qr_density, name_len;
+    unsigned int L, R, M, fname_len, entries_off, is_pmgl;
+    int cmp;
+
+    fname_len = strlen(filename);
+
+    /* PMGL chunk or PMGI chunk? (note: read_chunk() has already
+     * checked the rest of the characters in the chunk signature) */
+    if (chunk[3] == 0x4C) {
+        is_pmgl = 1;
+        entries_off = pmgl_Entries;
+    }
+    else {
+        is_pmgl = 0;
+        entries_off = pmgi_Entries;
+    }
+
+    /*  Step 1: binary search first filename of each QR entry
+     *  - target filename == entry
+     *    found file
+     *  - target filename < all entries
+     *    file not found
+     *  - target filename > all entries
+     *    proceed to step 2 using final entry
+     *  - target filename between two searched entries
+     *    proceed to step 2
+     */
+    qr_size     = EndGetI32(&chunk[pmgl_QuickRefSize]);
+    start       = &chunk[chm->chunk_size - 2];
+    end         = &chunk[chm->chunk_size - qr_size];
+    num_entries = EndGetI16(start);
+    qr_density  = 1 + (1 << chm->density);
+    qr_entries  = (num_entries + qr_density-1) / qr_density;
+
+    if (num_entries == 0) {
+        D(("chunk has no entries"))
+        return -1;
+    }
+
+    if (qr_size > chm->chunk_size) {
+        D(("quickref size > chunk size"))
+        return -1;
+    }
+
+    *result_end = end;
+
+    if (((int)qr_entries * 2) > (start - end)) {
+        D(("WARNING; more quickrefs than quickref space"))
+        qr_entries = 0; /* but we can live with it */
+    }
+
+    if (qr_entries > 0) {
+        L = 0;
+        R = qr_entries - 1;
+        do {
+            /* pick new midpoint */
+            M = (L + R) >> 1;
+
+            /* compare filename with entry QR points to */
+            p = &chunk[entries_off + (M ? EndGetI16(start - (M << 1)) : 0)];
+            READ_ENCINT(name_len);
+            if (name_len > (unsigned int) (end - p)) goto chunk_end;
+            cmp = compare(filename, (char *)p, fname_len, name_len);
+
+            if (cmp == 0) break;
+            else if (cmp < 0) { if (M) R = M - 1; else return 0; }
+            else if (cmp > 0) L = M + 1;
+        } while (L <= R);
+        M = (L + R) >> 1;
+
+        if (cmp == 0) {
+            /* exact match! */
+            p += name_len;
+            *result = p;
+            return 1;
+        }
+
+        /* otherwise, read the group of entries for QR entry M */
+        p = &chunk[entries_off + (M ? EndGetI16(start - (M << 1)) : 0)];
+        num_entries -= (M * qr_density);
+        if (num_entries > qr_density) num_entries = qr_density;
+    }
+    else {
+        p = &chunk[entries_off];
+    }
+
+    /* Step 2: linear search through the set of entries reached in step 1.
+     * - filename == any entry
+     *   found entry
+     * - filename < all entries (PMGI) or any entry (PMGL)
+     *   entry not found, stop now
+     * - filename > all entries
+     *   entry not found (PMGL) / maybe found (PMGI)
+     * - 
+     */
+    *result = NULL;
+    while (num_entries-- > 0) {
+        READ_ENCINT(name_len);
+        if (name_len > (unsigned int) (end - p)) goto chunk_end;
+        cmp = compare(filename, (char *)p, fname_len, name_len);
+        p += name_len;
+
+        if (cmp == 0) {
+            /* entry found */
+            *result = p;
+            return 1;
+        }
+
+        if (cmp < 0) {
+            /* entry not found (PMGL) / maybe found (PMGI) */
+            break;
+        }
+
+        /* read and ignore the rest of this entry */
+        if (is_pmgl) {
+            READ_ENCINT(R); /* skip section */
+            READ_ENCINT(R); /* skip offset */
+            READ_ENCINT(R); /* skip length */
+        }
+        else {
+            *result = p; /* store potential final result */
+            READ_ENCINT(R); /* skip chunk number */
+        }
+    }
+
+     /* PMGL? not found. PMGI? maybe found */
+     return (is_pmgl) ? 0 : (*result ? 1 : 0);
+
+ chunk_end:
+    D(("reached end of chunk data while searching"))
+    return -1;
+}
+
+#if HAVE_TOWLOWER
+# include <wctype.h>
+# define TOLOWER(x) towlower(x)
+#else
+# include <ctype.h>
+# define TOLOWER(x) tolower(x)
+#endif
+
+/* decodes a UTF-8 character from s[] into c. Will not read past e. 
+ * doesn't test that extension bytes are %10xxxxxx.
+ * allows some overlong encodings.
+ */
+#define GET_UTF8_CHAR(s, e, c) do {                                     \
+    unsigned char x = *s++;                                             \
+    if (x < 0x80) c = x;                                                \
+    else if (x >= 0xC2 && x < 0xE0 && s < e) {                          \
+        c = (x & 0x1F) << 6 | (*s++ & 0x3F);                            \
+    }                                                                   \
+    else if (x >= 0xE0 && x < 0xF0 && s+1 < e) {                        \
+        c = (x & 0x0F) << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);      \
+        s += 2;                                                         \
+    }                                                                   \
+    else if (x >= 0xF0 && x <= 0xF5 && s+2 < e) {                       \
+        c = (x & 0x07) << 18 | (s[0] & 0x3F) << 12 |                    \
+            (s[1] & 0x3F) << 6 | (s[2] & 0x3F);                         \
+        if (c > 0x10FFFF) c = 0xFFFD;                                   \
+        s += 3;                                                         \
+    }                                                                   \
+    else c = 0xFFFD;                                                    \
+} while (0)
+
+/* case-insensitively compares two UTF8 encoded strings. String length for
+ * both strings must be provided, null bytes are not terminators */
+static inline int compare(const char *s1, const char *s2, int l1, int l2) {
+    register const unsigned char *p1 = (const unsigned char *) s1;
+    register const unsigned char *p2 = (const unsigned char *) s2;
+    register const unsigned char *e1 = p1 + l1, *e2 = p2 + l2;
+    int c1, c2;
+
+    while (p1 < e1 && p2 < e2) {
+        GET_UTF8_CHAR(p1, e1, c1);
+        GET_UTF8_CHAR(p2, e2, c2);
+        if (c1 == c2) continue;
+        c1 = TOLOWER(c1);
+        c2 = TOLOWER(c2);
+        if (c1 != c2) return c1 - c2;
+    }
+    return l1 - l2;
+}
+
+
+/***************************************
+ * CHMD_EXTRACT
+ ***************************************
+ * extracts a file from a CHM helpfile
+ */
+static int chmd_extract(struct mschm_decompressor *base,
+                        struct mschmd_file *file, const char *filename)
+{
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+  struct mspack_system *sys;
+  struct mschmd_header *chm;
+  struct mspack_file *fh;
+  off_t bytes;
+
+  if (!self) return MSPACK_ERR_ARGS;
+  if (!file || !file->section) return self->error = MSPACK_ERR_ARGS;
+  sys = self->system;
+  chm = file->section->chm;
+
+  /* create decompression state if it doesn't exist */
+  if (!self->d) {
+    self->d = (struct mschmd_decompress_state *) sys->alloc(sys, sizeof(struct mschmd_decompress_state));
+    if (!self->d) return self->error = MSPACK_ERR_NOMEMORY;
+    self->d->chm       = chm;
+    self->d->offset    = 0;
+    self->d->state     = NULL;
+    self->d->sys       = *sys;
+    self->d->sys.write = &chmd_sys_write;
+    self->d->infh      = NULL;
+    self->d->outfh     = NULL;
+  }
+
+  /* open input chm file if not open, or the open one is a different chm */
+  if (!self->d->infh || (self->d->chm != chm)) {
+    if (self->d->infh)  sys->close(self->d->infh);
+    if (self->d->state) lzxd_free(self->d->state);
+    self->d->chm    = chm;
+    self->d->offset = 0;
+    self->d->state  = NULL;
+    self->d->infh   = sys->open(sys, chm->filename, MSPACK_SYS_OPEN_READ);
+    if (!self->d->infh) return self->error = MSPACK_ERR_OPEN;
+  }
+
+  /* open file for output */
+  if (!(fh = sys->open(sys, filename, MSPACK_SYS_OPEN_WRITE))) {
+    return self->error = MSPACK_ERR_OPEN;
+  }
+
+  /* if file is empty, simply creating it is enough */
+  if (!file->length) {
+    sys->close(fh);
+    return self->error = MSPACK_ERR_OK;
+  }
+
+  self->error = MSPACK_ERR_OK;
+
+  switch (file->section->id) {
+  case 0: /* Uncompressed section file */
+    /* simple seek + copy */
+    if (sys->seek(self->d->infh, file->section->chm->sec0.offset
+                  + file->offset, MSPACK_SYS_SEEK_START))
+    {
+      self->error = MSPACK_ERR_SEEK;
+    }
+    else {
+      unsigned char buf[512];
+      off_t length = file->length;
+      while (length > 0) {
+        int run = sizeof(buf);
+        if ((off_t)run > length) run = (int)length;
+        if (sys->read(self->d->infh, &buf[0], run) != run) {
+          self->error = MSPACK_ERR_READ;
+          break;
+        }
+        if (sys->write(fh, &buf[0], run) != run) {
+          self->error = MSPACK_ERR_WRITE;
+          break;
+        }
+        length -= run;
+      }
+    }
+    break;
+
+  case 1: /* MSCompressed section file */
+    /* (re)initialise compression state if we it is not yet initialised,
+     * or we have advanced too far and have to backtrack
+     */
+    if (!self->d->state || (file->offset < self->d->offset)) {
+      if (self->d->state) {
+        lzxd_free(self->d->state);
+        self->d->state = NULL;
+      }
+      if (chmd_init_decomp(self, file)) break;
+    }
+
+    /* seek to input data */
+    if (sys->seek(self->d->infh, self->d->inoffset, MSPACK_SYS_SEEK_START)) {
+      self->error = MSPACK_ERR_SEEK;
+      break;
+    }
+
+    /* get to correct offset. */
+    self->d->outfh = NULL;
+    if ((bytes = file->offset - self->d->offset)) {
+      self->error = lzxd_decompress(self->d->state, bytes);
+    }
+
+    /* if getting to the correct offset was error free, unpack file */
+    if (!self->error) {
+      self->d->outfh = fh;
+      self->error = lzxd_decompress(self->d->state, file->length);
+    }
+
+    /* save offset in input source stream, in case there is a section 0
+     * file between now and the next section 1 file extracted */
+    self->d->inoffset = sys->tell(self->d->infh);
+
+    /* if an LZX error occured, the LZX decompressor is now useless */
+    if (self->error) {
+      if (self->d->state) lzxd_free(self->d->state);
+      self->d->state = NULL;
+    }
+    break;
+  }
+
+  sys->close(fh);
+  return self->error;
+}
+
+/***************************************
+ * CHMD_SYS_WRITE
+ ***************************************
+ * chmd_sys_write is the internal writer function which the decompressor
+ * uses. If either writes data to disk (self->d->outfh) with the real
+ * sys->write() function, or does nothing with the data when
+ * self->d->outfh == NULL. advances self->d->offset.
+ */
+static int chmd_sys_write(struct mspack_file *file, void *buffer, int bytes) {
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) file;
+  self->d->offset += bytes;
+  if (self->d->outfh) {
+    return self->system->write(self->d->outfh, buffer, bytes);
+  }
+  return bytes;
+}
+
+/***************************************
+ * CHMD_INIT_DECOMP
+ ***************************************
+ * Initialises the LZX decompressor to decompress the compressed stream,
+ * from the nearest reset offset and length that is needed for the given
+ * file.
+ */
+static int chmd_init_decomp(struct mschm_decompressor_p *self,
+                            struct mschmd_file *file)
+{
+  int window_size, window_bits, reset_interval, entry, err;
+  struct mspack_system *sys = self->system;
+  struct mschmd_sec_mscompressed *sec;
+  unsigned char *data;
+  off_t length, offset;
+
+  sec = (struct mschmd_sec_mscompressed *) file->section;
+
+  /* ensure we have a mscompressed content section */
+  err = find_sys_file(self, sec, &sec->content, content_name);
+  if (err) return self->error = err;
+
+  /* ensure we have a ControlData file */
+  err = find_sys_file(self, sec, &sec->control, control_name);
+  if (err) return self->error = err;
+
+  /* read ControlData */
+  if (sec->control->length < lzxcd_SIZEOF) {
+    D(("ControlData file is too short"))
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+  if (!(data = read_sys_file(self, sec->control))) {
+    D(("can't read mscompressed control data file"))
+    return self->error;
+  }
+
+  /* check LZXC signature */
+  if (EndGetI32(&data[lzxcd_Signature]) != 0x43585A4C) {
+    sys->free(data);
+    return self->error = MSPACK_ERR_SIGNATURE;
+  }
+
+  /* read reset_interval and window_size and validate version number */
+  switch (EndGetI32(&data[lzxcd_Version])) {
+  case 1:
+    reset_interval = EndGetI32(&data[lzxcd_ResetInterval]);
+    window_size    = EndGetI32(&data[lzxcd_WindowSize]);
+    break;
+  case 2:
+    reset_interval = EndGetI32(&data[lzxcd_ResetInterval]) * LZX_FRAME_SIZE;
+    window_size    = EndGetI32(&data[lzxcd_WindowSize])    * LZX_FRAME_SIZE;
+    break;
+  default:
+    D(("bad controldata version"))
+    sys->free(data);
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* free ControlData */
+  sys->free(data);
+
+  /* find window_bits from window_size */
+  switch (window_size) {
+  case 0x008000: window_bits = 15; break;
+  case 0x010000: window_bits = 16; break;
+  case 0x020000: window_bits = 17; break;
+  case 0x040000: window_bits = 18; break;
+  case 0x080000: window_bits = 19; break;
+  case 0x100000: window_bits = 20; break;
+  case 0x200000: window_bits = 21; break;
+  default:
+    D(("bad controldata window size"))
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* validate reset_interval */
+  if (reset_interval == 0 || reset_interval % LZX_FRAME_SIZE) {
+    D(("bad controldata reset interval"))
+    return self->error = MSPACK_ERR_DATAFORMAT;
+  }
+
+  /* which reset table entry would we like? */
+  entry = file->offset / reset_interval;
+  /* convert from reset interval multiple (usually 64k) to 32k frames */
+  entry *= reset_interval / LZX_FRAME_SIZE;
+
+  /* read the reset table entry */
+  if (read_reset_table(self, sec, entry, &length, &offset)) {
+    /* the uncompressed length given in the reset table is dishonest.
+     * the uncompressed data is always padded out from the given
+     * uncompressed length up to the next reset interval */
+    length += reset_interval - 1;
+    length &= -reset_interval;
+  }
+  else {
+    /* if we can't read the reset table entry, just start from
+     * the beginning. Use spaninfo to get the uncompressed length */
+    entry = 0;
+    offset = 0;
+    err = read_spaninfo(self, sec, &length);
+  }
+  if (err) return self->error = err;
+
+  /* get offset of compressed data stream:
+   * = offset of uncompressed section from start of file
+   * + offset of compressed stream from start of uncompressed section
+   * + offset of chosen reset interval from start of compressed stream */
+  self->d->inoffset = file->section->chm->sec0.offset + sec->content->offset + offset;
+
+  /* set start offset and overall remaining stream length */
+  self->d->offset = entry * LZX_FRAME_SIZE;
+  length -= self->d->offset;
+
+  /* initialise LZX stream */
+  self->d->state = lzxd_init(&self->d->sys, self->d->infh,
+                             (struct mspack_file *) self, window_bits,
+                             reset_interval / LZX_FRAME_SIZE,
+                             4096, length, 0);
+  if (!self->d->state) self->error = MSPACK_ERR_NOMEMORY;
+  return self->error;
+}
+
+/***************************************
+ * READ_RESET_TABLE
+ ***************************************
+ * Reads one entry out of the reset table. Also reads the uncompressed
+ * data length. Writes these to offset_ptr and length_ptr respectively.
+ * Returns non-zero for success, zero for failure.
+ */
+static int read_reset_table(struct mschm_decompressor_p *self,
+                            struct mschmd_sec_mscompressed *sec,
+                            unsigned int entry,
+                            off_t *length_ptr, off_t *offset_ptr)
+{
+    struct mspack_system *sys = self->system;
+    unsigned char *data;
+    unsigned int pos, entrysize;
+
+    /* do we have a ResetTable file? */
+    int err = find_sys_file(self, sec, &sec->rtable, rtable_name);
+    if (err) return 0;
+
+    /* read ResetTable file */
+    if (sec->rtable->length < lzxrt_headerSIZEOF) {
+        D(("ResetTable file is too short"))
+        return 0;
+    }
+    if (!(data = read_sys_file(self, sec->rtable))) {
+        D(("can't read reset table"))
+        return 0;
+    }
+
+    /* check sanity of reset table */
+    if (EndGetI32(&data[lzxrt_FrameLen]) != LZX_FRAME_SIZE) {
+        D(("bad reset table frame length"))
+        sys->free(data);
+        return 0;
+    }
+
+    /* get the uncompressed length of the LZX stream */
+    if (read_off64(length_ptr, &data[lzxrt_UncompLen], sys, self->d->infh)) {
+        sys->free(data);
+        return 0;
+    }
+
+    entrysize = EndGetI32(&data[lzxrt_EntrySize]);
+    pos = EndGetI32(&data[lzxrt_TableOffset]) + (entry * entrysize);
+
+    /* ensure reset table entry for this offset exists */
+    if (entry < EndGetI32(&data[lzxrt_NumEntries]) &&
+        pos <= (sec->rtable->length - entrysize))
+    {
+        switch (entrysize) {
+        case 4:
+            *offset_ptr = EndGetI32(&data[pos]);
+            err = 0;
+            break;
+        case 8:
+            err = read_off64(offset_ptr, &data[pos], sys, self->d->infh);
+            break;
+        default:
+            D(("reset table entry size neither 4 nor 8"))
+            err = 1;
+            break;
+        }
+    }
+    else {
+        D(("bad reset interval"))
+        err = 1;
+    }
+
+    /* free the reset table */
+    sys->free(data);
+
+    /* return success */
+    return (err == 0);
+}
+
+/***************************************
+ * READ_SPANINFO
+ ***************************************
+ * Reads the uncompressed data length from the spaninfo file.
+ * Returns zero for success or a non-zero error code for failure.
+ */
+static int read_spaninfo(struct mschm_decompressor_p *self,
+                         struct mschmd_sec_mscompressed *sec,
+                         off_t *length_ptr)
+{
+    struct mspack_system *sys = self->system;
+    unsigned char *data;
+    
+    /* find SpanInfo file */
+    int err = find_sys_file(self, sec, &sec->spaninfo, spaninfo_name);
+    if (err) return MSPACK_ERR_DATAFORMAT;
+
+    /* check it's large enough */
+    if (sec->spaninfo->length != 8) {
+        D(("SpanInfo file is wrong size"))
+        return MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* read the SpanInfo file */
+    if (!(data = read_sys_file(self, sec->spaninfo))) {
+        D(("can't read SpanInfo file"))
+        return self->error;
+    }
+
+    /* get the uncompressed length of the LZX stream */
+    err = read_off64(length_ptr, data, sys, self->d->infh);
+    sys->free(data);
+    if (err) return MSPACK_ERR_DATAFORMAT;
+
+    if (*length_ptr <= 0) {
+        D(("output length is invalid"))
+        return MSPACK_ERR_DATAFORMAT;
+    }
+
+    return MSPACK_ERR_OK;
+}
+
+/***************************************
+ * FIND_SYS_FILE
+ ***************************************
+ * Uses chmd_fast_find to locate a system file, and fills out that system
+ * file's entry and links it into the list of system files. Returns zero
+ * for success, non-zero for both failure and the file not existing.
+ */
+static int find_sys_file(struct mschm_decompressor_p *self,
+                         struct mschmd_sec_mscompressed *sec,
+                         struct mschmd_file **f_ptr, const char *name)
+{
+    struct mspack_system *sys = self->system;
+    struct mschmd_file result;
+
+    /* already loaded */
+    if (*f_ptr) return MSPACK_ERR_OK;
+
+    /* try using fast_find to find the file - return DATAFORMAT error if
+     * it fails, or successfully doesn't find the file */
+    if (chmd_fast_find((struct mschm_decompressor *) self, sec->base.chm,
+                       name, &result, (int)sizeof(result)) || !result.section)
+    {
+        return MSPACK_ERR_DATAFORMAT;
+    }
+
+    if (!(*f_ptr = (struct mschmd_file *) sys->alloc(sys, sizeof(result)))) {
+        return MSPACK_ERR_NOMEMORY;
+    }
+
+    /* copy result */
+    *(*f_ptr) = result;
+    (*f_ptr)->filename = (char *) name;
+
+    /* link file into sysfiles list */
+    (*f_ptr)->next = sec->base.chm->sysfiles;
+    sec->base.chm->sysfiles = *f_ptr;
+    return MSPACK_ERR_OK;
+}
+
+/***************************************
+ * READ_SYS_FILE
+ ***************************************
+ * Allocates memory for a section 0 (uncompressed) file and reads it into
+ * memory.
+ */
+static unsigned char *read_sys_file(struct mschm_decompressor_p *self,
+                                    struct mschmd_file *file)
+{
+  struct mspack_system *sys = self->system;
+  unsigned char *data = NULL;
+  int len;
+
+  if (!file || !file->section || (file->section->id != 0)) {
+    self->error = MSPACK_ERR_DATAFORMAT;
+    return NULL;
+  }
+
+  len = (int) file->length;
+
+  if (!(data = (unsigned char *) sys->alloc(sys, (size_t) len))) {
+    self->error = MSPACK_ERR_NOMEMORY;
+    return NULL;
+  }
+  if (sys->seek(self->d->infh, file->section->chm->sec0.offset
+                + file->offset, MSPACK_SYS_SEEK_START))
+  {
+    self->error = MSPACK_ERR_SEEK;
+    sys->free(data);
+    return NULL;
+  }
+  if (sys->read(self->d->infh, data, len) != len) {
+    self->error = MSPACK_ERR_READ;
+    sys->free(data);
+    return NULL;
+  }
+  return data;
+}
+
+/***************************************
+ * CHMD_ERROR
+ ***************************************
+ * returns the last error that occurred
+ */
+static int chmd_error(struct mschm_decompressor *base) {
+  struct mschm_decompressor_p *self = (struct mschm_decompressor_p *) base;
+  return (self) ? self->error : MSPACK_ERR_ARGS;
+}
+
+/***************************************
+ * READ_OFF64
+ ***************************************
+ * Reads a 64-bit signed integer from memory in Intel byte order.
+ * If running on a system with a 64-bit off_t, this is simply done.
+ * If running on a system with a 32-bit off_t, offsets up to 0x7FFFFFFF
+ * are accepted, offsets beyond that cause an error message.
+ */
+static int read_off64(off_t *var, unsigned char *mem,
+                      struct mspack_system *sys, struct mspack_file *fh)
+{
+#if LARGEFILE_SUPPORT
+    *var = EndGetI64(mem);
+#else
+    *var = EndGetI32(mem);
+    if ((*var & 0x80000000) || EndGetI32(mem+4)) {
+        sys->message(fh, (char *)largefile_msg);
+        return 1;
+    }
+#endif
+    return 0;
+}
diff --git a/utils/rbutilqt/mspack/des.h b/utils/rbutilqt/mspack/des.h
new file mode 100644
index 0000000000..64a1ed27e4
--- /dev/null
+++ b/utils/rbutilqt/mspack/des.h
@@ -0,0 +1,15 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_DES_H
+#define MSPACK_DES_H 1
+
+/* DES encryption / decryption definitions */
+
+#endif
diff --git a/utils/rbutilqt/mspack/hlp.h b/utils/rbutilqt/mspack/hlp.h
new file mode 100644
index 0000000000..a6e3abc7ff
--- /dev/null
+++ b/utils/rbutilqt/mspack/hlp.h
@@ -0,0 +1,33 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_HLP_H
+#define MSPACK_HLP_H 1
+
+#include "lzss.h"
+
+/* generic HLP definitions */
+
+/* HLP compression definitions */
+
+struct mshlp_compressor_p {
+  struct mshlp_compressor base;
+  struct mspack_system *system;
+  /* todo */
+};
+
+/* HLP decompression definitions */
+
+struct mshlp_decompressor_p {
+  struct mshlp_decompressor base;
+  struct mspack_system *system;
+  /* todo */
+};
+
+#endif
diff --git a/utils/rbutilqt/mspack/hlpc.c b/utils/rbutilqt/mspack/hlpc.c
new file mode 100644
index 0000000000..b33e499f65
--- /dev/null
+++ b/utils/rbutilqt/mspack/hlpc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* HLP compression implementation */
+
+#include "system-mspack.h"
+#include "hlp.h"
+
+struct mshlp_compressor *
+  mspack_create_hlp_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_hlp_compressor(struct mshlp_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/hlpd.c b/utils/rbutilqt/mspack/hlpd.c
new file mode 100644
index 0000000000..ae1f2efba8
--- /dev/null
+++ b/utils/rbutilqt/mspack/hlpd.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* HLP decompression implementation */
+
+#include "system-mspack.h"
+#include "hlp.h"
+
+struct mshlp_decompressor *
+  mspack_create_hlp_decompressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_hlp_decompressor(struct mshlp_decompressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/kwaj.h b/utils/rbutilqt/mspack/kwaj.h
new file mode 100644
index 0000000000..75425d958a
--- /dev/null
+++ b/utils/rbutilqt/mspack/kwaj.h
@@ -0,0 +1,118 @@
+/* This file is part of libmspack.
+ * (C) 2003-2010 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_KWAJ_H
+#define MSPACK_KWAJ_H 1
+
+#include "lzss.h"
+
+/* generic KWAJ definitions */
+#define kwajh_Signature1 (0x00)
+#define kwajh_Signature2 (0x04)
+#define kwajh_CompMethod (0x08)
+#define kwajh_DataOffset (0x0a)
+#define kwajh_Flags      (0x0c)
+#define kwajh_SIZEOF     (0x0e)
+
+/* KWAJ compression definitions */
+
+struct mskwaj_compressor_p {
+  struct mskwaj_compressor base;
+  struct mspack_system *system;
+  /* todo */
+  int param[2]; /* !!! MATCH THIS TO NUM OF PARAMS IN MSPACK.H !!! */
+  int error;
+};
+
+/* KWAJ decompression definitions */
+
+struct mskwaj_decompressor_p {
+  struct mskwaj_decompressor base;
+  struct mspack_system *system;
+  int error;
+};
+
+struct mskwajd_header_p {
+  struct mskwajd_header base;
+  struct mspack_file *fh;
+};
+
+/* input buffer size during decompression - not worth parameterising IMHO */
+#define KWAJ_INPUT_SIZE (2048)
+
+/* huffman codes that are 9 bits or less are decoded immediately */
+#define KWAJ_TABLEBITS (9)
+
+/* number of codes in each huffman table */
+#define KWAJ_MATCHLEN1_SYMS (16)
+#define KWAJ_MATCHLEN2_SYMS (16)
+#define KWAJ_LITLEN_SYMS    (32)
+#define KWAJ_OFFSET_SYMS    (64)
+#define KWAJ_LITERAL_SYMS   (256)
+
+/* define decoding table sizes */
+#define KWAJ_TABLESIZE (1 << KWAJ_TABLEBITS)
+#if KWAJ_TABLESIZE < (KWAJ_MATCHLEN1_SYMS * 2)
+# define KWAJ_MATCHLEN1_TBLSIZE (KWAJ_MATCHLEN1_SYMS * 4)
+#else
+# define KWAJ_MATCHLEN1_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_MATCHLEN1_SYMS * 2))
+#endif
+#if KWAJ_TABLESIZE < (KWAJ_MATCHLEN2_SYMS * 2)
+# define KWAJ_MATCHLEN2_TBLSIZE (KWAJ_MATCHLEN2_SYMS * 4)
+#else
+# define KWAJ_MATCHLEN2_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_MATCHLEN2_SYMS * 2))
+#endif
+#if KWAJ_TABLESIZE < (KWAJ_LITLEN_SYMS * 2)
+# define KWAJ_LITLEN_TBLSIZE (KWAJ_LITLEN_SYMS * 4)
+#else
+# define KWAJ_LITLEN_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_LITLEN_SYMS * 2))
+#endif
+#if KWAJ_TABLESIZE < (KWAJ_OFFSET_SYMS * 2)
+# define KWAJ_OFFSET_TBLSIZE (KWAJ_OFFSET_SYMS * 4)
+#else
+# define KWAJ_OFFSET_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_OFFSET_SYMS * 2))
+#endif
+#if KWAJ_TABLESIZE < (KWAJ_LITERAL_SYMS * 2)
+# define KWAJ_LITERAL_TBLSIZE (KWAJ_LITERAL_SYMS * 4)
+#else
+# define KWAJ_LITERAL_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_LITERAL_SYMS * 2))
+#endif
+
+struct kwajd_stream {
+    /* I/O buffering */
+    struct mspack_system *sys;
+    struct mspack_file *input;
+    struct mspack_file *output;
+    unsigned char *i_ptr, *i_end;
+    unsigned int bit_buffer, bits_left;
+    int input_end;
+
+    /* huffman code lengths */
+    unsigned char  MATCHLEN1_len [KWAJ_MATCHLEN1_SYMS];
+    unsigned char  MATCHLEN2_len [KWAJ_MATCHLEN2_SYMS];
+    unsigned char  LITLEN_len    [KWAJ_LITLEN_SYMS];
+    unsigned char  OFFSET_len    [KWAJ_OFFSET_SYMS];
+    unsigned char  LITERAL_len   [KWAJ_LITERAL_SYMS];
+
+    /* huffman decoding tables */
+    unsigned short MATCHLEN1_table [KWAJ_MATCHLEN1_TBLSIZE];
+    unsigned short MATCHLEN2_table [KWAJ_MATCHLEN2_TBLSIZE];
+    unsigned short LITLEN_table    [KWAJ_LITLEN_TBLSIZE];
+    unsigned short OFFSET_table    [KWAJ_OFFSET_TBLSIZE];
+    unsigned short LITERAL_table   [KWAJ_LITERAL_TBLSIZE];
+
+    /* input buffer */
+    unsigned char inbuf[KWAJ_INPUT_SIZE];
+
+    /* history window */
+    unsigned char window[LZSS_WINDOW_SIZE];
+};
+
+
+#endif
diff --git a/utils/rbutilqt/mspack/kwajc.c b/utils/rbutilqt/mspack/kwajc.c
new file mode 100644
index 0000000000..52ca29432a
--- /dev/null
+++ b/utils/rbutilqt/mspack/kwajc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* KWAJ compression implementation */
+
+#include "system-mspack.h"
+#include "kwaj.h"
+
+struct mskwaj_compressor *
+  mspack_create_kwaj_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_kwaj_compressor(struct mskwaj_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/kwajd.c b/utils/rbutilqt/mspack/kwajd.c
new file mode 100644
index 0000000000..24e0b0613b
--- /dev/null
+++ b/utils/rbutilqt/mspack/kwajd.c
@@ -0,0 +1,566 @@
+/* This file is part of libmspack.
+ * (C) 2003-2011 Stuart Caie.
+ *
+ * KWAJ is a format very similar to SZDD. KWAJ method 3 (LZH) was
+ * written by Jeff Johnson.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* KWAJ decompression implementation */
+
+#include "system-mspack.h"
+#include "kwaj.h"
+#include "mszip.h"
+
+/* prototypes */
+static struct mskwajd_header *kwajd_open(
+    struct mskwaj_decompressor *base, const char *filename);
+static void kwajd_close(
+    struct mskwaj_decompressor *base, struct mskwajd_header *hdr);
+static int kwajd_read_headers(
+    struct mspack_system *sys, struct mspack_file *fh,
+    struct mskwajd_header *hdr);
+static int kwajd_extract(
+    struct mskwaj_decompressor *base, struct mskwajd_header *hdr,
+    const char *filename);
+static int kwajd_decompress(
+    struct mskwaj_decompressor *base, const char *input, const char *output);
+static int kwajd_error(
+    struct mskwaj_decompressor *base);
+
+static struct kwajd_stream *lzh_init(
+    struct mspack_system *sys, struct mspack_file *in, struct mspack_file *out);
+static int lzh_decompress(
+    struct kwajd_stream *kwaj);
+static void lzh_free(
+    struct kwajd_stream *kwaj);
+static int lzh_read_lens(
+    struct kwajd_stream *kwaj,
+    unsigned int type, unsigned int numsyms,
+    unsigned char *lens);
+static int lzh_read_input(
+    struct kwajd_stream *kwaj);
+
+
+/***************************************
+ * MSPACK_CREATE_KWAJ_DECOMPRESSOR
+ ***************************************
+ * constructor
+ */
+struct mskwaj_decompressor *
+    mspack_create_kwaj_decompressor(struct mspack_system *sys)
+{
+  struct mskwaj_decompressor_p *self = NULL;
+
+  if (!sys) sys = mspack_default_system;
+  if (!mspack_valid_system(sys)) return NULL;
+
+  if ((self = (struct mskwaj_decompressor_p *) sys->alloc(sys, sizeof(struct mskwaj_decompressor_p)))) {
+    self->base.open       = &kwajd_open;
+    self->base.close      = &kwajd_close;
+    self->base.extract    = &kwajd_extract;
+    self->base.decompress = &kwajd_decompress;
+    self->base.last_error = &kwajd_error;
+    self->system          = sys;
+    self->error           = MSPACK_ERR_OK;
+  }
+  return (struct mskwaj_decompressor *) self;
+}
+
+/***************************************
+ * MSPACK_DESTROY_KWAJ_DECOMPRESSOR
+ ***************************************
+ * destructor
+ */
+void mspack_destroy_kwaj_decompressor(struct mskwaj_decompressor *base)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    if (self) {
+        struct mspack_system *sys = self->system;
+        sys->free(self);
+    }
+}
+
+/***************************************
+ * KWAJD_OPEN
+ ***************************************
+ * opens a KWAJ file without decompressing, reads header
+ */
+static struct mskwajd_header *kwajd_open(struct mskwaj_decompressor *base,
+                                         const char *filename)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    struct mskwajd_header *hdr;
+    struct mspack_system *sys;
+    struct mspack_file *fh;
+
+    if (!self) return NULL;
+    sys = self->system;
+
+    fh  = sys->open(sys, filename, MSPACK_SYS_OPEN_READ);
+    hdr = (struct mskwajd_header *) sys->alloc(sys, sizeof(struct mskwajd_header_p));
+    if (fh && hdr) {
+        ((struct mskwajd_header_p *) hdr)->fh = fh;
+        self->error = kwajd_read_headers(sys, fh, hdr);
+    }
+    else {
+        if (!fh)  self->error = MSPACK_ERR_OPEN;
+        if (!hdr) self->error = MSPACK_ERR_NOMEMORY;
+    }
+    
+    if (self->error) {
+        if (fh) sys->close(fh);
+        sys->free(hdr);
+        hdr = NULL;
+    }
+
+    return hdr;
+}
+
+/***************************************
+ * KWAJD_CLOSE
+ ***************************************
+ * closes a KWAJ file
+ */
+static void kwajd_close(struct mskwaj_decompressor *base,
+                        struct mskwajd_header *hdr)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    struct mskwajd_header_p *hdr_p = (struct mskwajd_header_p *) hdr;
+
+    if (!self || !self->system) return;
+
+    /* close the file handle associated */
+    self->system->close(hdr_p->fh);
+
+    /* free the memory associated */
+    self->system->free(hdr);
+
+    self->error = MSPACK_ERR_OK;
+}
+
+/***************************************
+ * KWAJD_READ_HEADERS
+ ***************************************
+ * reads the headers of a KWAJ format file
+ */
+static int kwajd_read_headers(struct mspack_system *sys,
+                              struct mspack_file *fh,
+                              struct mskwajd_header *hdr)
+{
+    unsigned char buf[16];
+    int i;
+
+    /* read in the header */
+    if (sys->read(fh, &buf[0], kwajh_SIZEOF) != kwajh_SIZEOF) {
+        return MSPACK_ERR_READ;
+    }
+
+    /* check for "KWAJ" signature */
+    if (((unsigned int) EndGetI32(&buf[kwajh_Signature1]) != 0x4A41574B) ||
+        ((unsigned int) EndGetI32(&buf[kwajh_Signature2]) != 0xD127F088))
+    {
+        return MSPACK_ERR_SIGNATURE;
+    }
+
+    /* basic header fields */
+    hdr->comp_type    = EndGetI16(&buf[kwajh_CompMethod]);
+    hdr->data_offset  = EndGetI16(&buf[kwajh_DataOffset]);
+    hdr->headers      = EndGetI16(&buf[kwajh_Flags]);
+    hdr->length       = 0;
+    hdr->filename     = NULL;
+    hdr->extra        = NULL;
+    hdr->extra_length = 0;
+
+    /* optional headers */
+
+    /* 4 bytes: length of unpacked file */
+    if (hdr->headers & MSKWAJ_HDR_HASLENGTH) {
+        if (sys->read(fh, &buf[0], 4) != 4) return MSPACK_ERR_READ;
+        hdr->length = EndGetI32(&buf[0]);
+    }
+
+    /* 2 bytes: unknown purpose */
+    if (hdr->headers & MSKWAJ_HDR_HASUNKNOWN1) {
+        if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
+    }
+
+    /* 2 bytes: length of section, then [length] bytes: unknown purpose */
+    if (hdr->headers & MSKWAJ_HDR_HASUNKNOWN2) {
+        if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
+        i = EndGetI16(&buf[0]);
+        if (sys->seek(fh, (off_t)i, MSPACK_SYS_SEEK_CUR)) return MSPACK_ERR_SEEK;
+    }
+
+    /* filename and extension */
+    if (hdr->headers & (MSKWAJ_HDR_HASFILENAME | MSKWAJ_HDR_HASFILEEXT)) {
+        int len;
+        /* allocate memory for maximum length filename */
+        char *fn = (char *) sys->alloc(sys, (size_t) 13);
+        if (!(hdr->filename = fn)) return MSPACK_ERR_NOMEMORY;
+
+        /* copy filename if present */
+        if (hdr->headers & MSKWAJ_HDR_HASFILENAME) {
+            /* read and copy up to 9 bytes of a null terminated string */
+            if ((len = sys->read(fh, &buf[0], 9)) < 2) return MSPACK_ERR_READ;
+            for (i = 0; i < len; i++) if (!(*fn++ = buf[i])) break;
+            /* if string was 9 bytes with no null terminator, reject it */
+            if (i == 9 && buf[8] != '\0') return MSPACK_ERR_DATAFORMAT;
+            /* seek to byte after string ended in file */
+            if (sys->seek(fh, (off_t)(i + 1 - len), MSPACK_SYS_SEEK_CUR))
+                return MSPACK_ERR_SEEK;
+            fn--; /* remove the null terminator */
+        }
+
+        /* copy extension if present */
+        if (hdr->headers & MSKWAJ_HDR_HASFILEEXT) {
+            *fn++ = '.';
+            /* read and copy up to 4 bytes of a null terminated string */
+            if ((len = sys->read(fh, &buf[0], 4)) < 2) return MSPACK_ERR_READ;
+            for (i = 0; i < len; i++) if (!(*fn++ = buf[i])) break;
+            /* if string was 4 bytes with no null terminator, reject it */
+            if (i == 4 && buf[3] != '\0') return MSPACK_ERR_DATAFORMAT;
+            /* seek to byte after string ended in file */
+            if (sys->seek(fh, (off_t)(i + 1 - len), MSPACK_SYS_SEEK_CUR))
+                return MSPACK_ERR_SEEK;
+            fn--; /* remove the null terminator */
+        }
+        *fn = '\0';
+    }
+
+    /* 2 bytes: extra text length then [length] bytes of extra text data */
+    if (hdr->headers & MSKWAJ_HDR_HASEXTRATEXT) {
+        if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
+        i = EndGetI16(&buf[0]);
+        hdr->extra = (char *) sys->alloc(sys, (size_t)i+1);
+        if (! hdr->extra) return MSPACK_ERR_NOMEMORY;
+        if (sys->read(fh, hdr->extra, i) != i) return MSPACK_ERR_READ;
+        hdr->extra[i] = '\0';
+        hdr->extra_length = i;
+    }
+    return MSPACK_ERR_OK;
+}
+
+/***************************************
+ * KWAJD_EXTRACT
+ ***************************************
+ * decompresses a KWAJ file
+ */
+static int kwajd_extract(struct mskwaj_decompressor *base,
+                         struct mskwajd_header *hdr, const char *filename)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    struct mspack_system *sys;
+    struct mspack_file *fh, *outfh;
+
+    if (!self) return MSPACK_ERR_ARGS;
+    if (!hdr) return self->error = MSPACK_ERR_ARGS;
+
+    sys = self->system;
+    fh = ((struct mskwajd_header_p *) hdr)->fh;
+
+    /* seek to the compressed data */
+    if (sys->seek(fh, hdr->data_offset, MSPACK_SYS_SEEK_START)) {
+        return self->error = MSPACK_ERR_SEEK;
+    }
+
+    /* open file for output */
+    if (!(outfh = sys->open(sys, filename, MSPACK_SYS_OPEN_WRITE))) {
+        return self->error = MSPACK_ERR_OPEN;
+    }
+
+    self->error = MSPACK_ERR_OK;
+
+    /* decompress based on format */
+    if (hdr->comp_type == MSKWAJ_COMP_NONE ||
+        hdr->comp_type == MSKWAJ_COMP_XOR)
+    {
+        /* NONE is a straight copy. XOR is a copy xored with 0xFF */
+        unsigned char *buf = (unsigned char *) sys->alloc(sys, (size_t) KWAJ_INPUT_SIZE);
+        if (buf) {
+            int read, i;
+            while ((read = sys->read(fh, buf, KWAJ_INPUT_SIZE)) > 0) {
+                if (hdr->comp_type == MSKWAJ_COMP_XOR) {
+                    for (i = 0; i < read; i++) buf[i] ^= 0xFF;
+                }
+                if (sys->write(outfh, buf, read) != read) {
+                    self->error = MSPACK_ERR_WRITE;
+                    break;
+                }
+            }
+            if (read < 0) self->error = MSPACK_ERR_READ;
+            sys->free(buf);
+        }
+        else {
+            self->error = MSPACK_ERR_NOMEMORY;
+        }
+    }
+    else if (hdr->comp_type == MSKWAJ_COMP_SZDD) {
+        self->error = lzss_decompress(sys, fh, outfh, KWAJ_INPUT_SIZE,
+                                      LZSS_MODE_EXPAND);
+    }
+    else if (hdr->comp_type == MSKWAJ_COMP_LZH) {
+        struct kwajd_stream *lzh = lzh_init(sys, fh, outfh);
+        self->error = (lzh) ? lzh_decompress(lzh) : MSPACK_ERR_NOMEMORY;
+        lzh_free(lzh);
+    }
+    else if (hdr->comp_type == MSKWAJ_COMP_MSZIP) {
+        struct mszipd_stream *zip = mszipd_init(sys,fh,outfh,KWAJ_INPUT_SIZE,0);
+        self->error = (zip) ? mszipd_decompress_kwaj(zip) : MSPACK_ERR_NOMEMORY;
+        mszipd_free(zip);
+    }
+    else {
+        self->error = MSPACK_ERR_DATAFORMAT;
+    }
+
+    /* close output file */
+    sys->close(outfh);
+
+    return self->error;
+}
+
+/***************************************
+ * KWAJD_DECOMPRESS
+ ***************************************
+ * unpacks directly from input to output
+ */
+static int kwajd_decompress(struct mskwaj_decompressor *base,
+                            const char *input, const char *output)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    struct mskwajd_header *hdr;
+    int error;
+
+    if (!self) return MSPACK_ERR_ARGS;
+
+    if (!(hdr = kwajd_open(base, input))) return self->error;
+    error = kwajd_extract(base, hdr, output);
+    kwajd_close(base, hdr);
+    return self->error = error;
+}
+
+/***************************************
+ * KWAJD_ERROR
+ ***************************************
+ * returns the last error that occurred
+ */
+static int kwajd_error(struct mskwaj_decompressor *base)
+{
+    struct mskwaj_decompressor_p *self = (struct mskwaj_decompressor_p *) base;
+    return (self) ? self->error : MSPACK_ERR_ARGS;
+}
+
+/***************************************
+ * LZH_INIT, LZH_DECOMPRESS, LZH_FREE
+ ***************************************
+ * unpacks KWAJ method 3 files
+ */
+
+/* import bit-reading macros and code */
+#define BITS_TYPE struct kwajd_stream
+#define BITS_VAR lzh
+#define BITS_ORDER_MSB
+#define BITS_NO_READ_INPUT
+#define READ_BYTES do {                                 \
+    if (i_ptr >= i_end) {                               \
+        if ((err = lzh_read_input(lzh))) return err;    \
+        i_ptr = lzh->i_ptr;                             \
+        i_end = lzh->i_end;                             \
+    }                                                   \
+    INJECT_BITS(*i_ptr++, 8);                           \
+} while (0)
+#include <readbits.h>
+
+/* import huffman-reading macros and code */
+#define TABLEBITS(tbl)      KWAJ_TABLEBITS
+#define MAXSYMBOLS(tbl)     KWAJ_##tbl##_SYMS
+#define HUFF_TABLE(tbl,idx) lzh->tbl##_table[idx]
+#define HUFF_LEN(tbl,idx)   lzh->tbl##_len[idx]
+#define HUFF_ERROR          return MSPACK_ERR_DATAFORMAT
+#include <readhuff.h>
+
+/* In the KWAJ LZH format, there is no special 'eof' marker, it just
+ * ends. Depending on how many bits are left in the final byte when
+ * the stream ends, that might be enough to start another literal or
+ * match. The only easy way to detect that we've come to an end is to
+ * guard all bit-reading. We allow fake bits to be read once we reach
+ * the end of the stream, but we check if we then consumed any of
+ * those fake bits, after doing the READ_BITS / READ_HUFFSYM. This
+ * isn't how the default readbits.h read_input() works (it simply lets
+ * 2 fake bytes in then stops), so we implement our own.
+ */
+#define READ_BITS_SAFE(val, n) do {                     \
+    READ_BITS(val, n);                                  \
+    if (lzh->input_end && bits_left < lzh->input_end)   \
+        return MSPACK_ERR_OK;                           \
+} while (0)
+
+#define READ_HUFFSYM_SAFE(tbl, val) do {                \
+    READ_HUFFSYM(tbl, val);                             \
+    if (lzh->input_end && bits_left < lzh->input_end)   \
+        return MSPACK_ERR_OK;                           \
+} while (0)
+
+#define BUILD_TREE(tbl, type)                                           \
+    STORE_BITS;                                                         \
+    err = lzh_read_lens(lzh, type, MAXSYMBOLS(tbl), &HUFF_LEN(tbl,0));  \
+    if (err) return err;                                                \
+    RESTORE_BITS;                                                       \
+    if (make_decode_table(MAXSYMBOLS(tbl), TABLEBITS(tbl),              \
+        &HUFF_LEN(tbl,0), &HUFF_TABLE(tbl,0)))                          \
+        return MSPACK_ERR_DATAFORMAT;
+
+#define WRITE_BYTE do {                                                 \
+    if (lzh->sys->write(lzh->output, &lzh->window[pos], 1) != 1)        \
+        return MSPACK_ERR_WRITE;                                        \
+} while (0)
+
+static struct kwajd_stream *lzh_init(struct mspack_system *sys,
+    struct mspack_file *in, struct mspack_file *out)
+{
+    struct kwajd_stream *lzh;
+
+    if (!sys || !in || !out) return NULL;
+    if (!(lzh = (struct kwajd_stream *) sys->alloc(sys, sizeof(struct kwajd_stream)))) return NULL;
+
+    lzh->sys    = sys;
+    lzh->input  = in;
+    lzh->output = out;
+    return lzh;
+}
+
+static int lzh_decompress(struct kwajd_stream *lzh)
+{
+    register unsigned int bit_buffer;
+    register int bits_left, i;
+    register unsigned short sym;
+    unsigned char *i_ptr, *i_end, lit_run = 0;
+    int j, pos = 0, len, offset, err;
+    unsigned int types[6];
+
+    /* reset global state */
+    INIT_BITS;
+    RESTORE_BITS;
+    memset(&lzh->window[0], LZSS_WINDOW_FILL, (size_t) LZSS_WINDOW_SIZE);
+
+    /* read 6 encoding types (for byte alignment) but only 5 are needed */
+    for (i = 0; i < 6; i++) READ_BITS_SAFE(types[i], 4);
+
+    /* read huffman table symbol lengths and build huffman trees */
+    BUILD_TREE(MATCHLEN1, types[0]);
+    BUILD_TREE(MATCHLEN2, types[1]);
+    BUILD_TREE(LITLEN,    types[2]);
+    BUILD_TREE(OFFSET,    types[3]);
+    BUILD_TREE(LITERAL,   types[4]);
+
+    while (!lzh->input_end) {
+        if (lit_run) READ_HUFFSYM_SAFE(MATCHLEN2, len);
+        else         READ_HUFFSYM_SAFE(MATCHLEN1, len);
+
+        if (len > 0) {
+            len += 2;
+            lit_run = 0; /* not the end of a literal run */
+            READ_HUFFSYM_SAFE(OFFSET, j); offset = j << 6;
+            READ_BITS_SAFE(j, 6);         offset |= j;
+
+            /* copy match as output and into the ring buffer */
+            while (len-- > 0) {
+                lzh->window[pos] = lzh->window[(pos+4096-offset) & 4095];
+                WRITE_BYTE;
+                pos++; pos &= 4095;
+            }
+        }
+        else {
+            READ_HUFFSYM_SAFE(LITLEN, len); len++;
+            lit_run = (len == 32) ? 0 : 1; /* end of a literal run? */
+            while (len-- > 0) {
+                READ_HUFFSYM_SAFE(LITERAL, j);
+                /* copy as output and into the ring buffer */
+                lzh->window[pos] = j;
+                WRITE_BYTE;
+                pos++; pos &= 4095;
+            }
+        }
+    }
+    return MSPACK_ERR_OK;
+}
+
+static void lzh_free(struct kwajd_stream *lzh)
+{
+    struct mspack_system *sys;
+    if (!lzh || !lzh->sys) return;
+    sys = lzh->sys;
+    sys->free(lzh);
+}
+
+static int lzh_read_lens(struct kwajd_stream *lzh,
+                         unsigned int type, unsigned int numsyms,
+                         unsigned char *lens)
+{
+    register unsigned int bit_buffer;
+    register int bits_left;
+    unsigned char *i_ptr, *i_end;
+    unsigned int i, c, sel;
+    int err;
+
+    RESTORE_BITS;
+    switch (type) {
+    case 0:
+        i = numsyms; c = (i==16)?4: (i==32)?5: (i==64)?6: (i==256)?8 :0;
+        for (i = 0; i < numsyms; i++) lens[i] = c;
+        break;
+
+    case 1:
+        READ_BITS_SAFE(c, 4); lens[0] = c;
+        for (i = 1; i < numsyms; i++) {
+                   READ_BITS_SAFE(sel, 1); if (sel == 0)  lens[i] = c;
+            else { READ_BITS_SAFE(sel, 1); if (sel == 0)  lens[i] = ++c;
+            else { READ_BITS_SAFE(c, 4);                  lens[i] = c; }}
+        }
+        break;
+
+    case 2:
+        READ_BITS_SAFE(c, 4); lens[0] = c;
+        for (i = 1; i < numsyms; i++) {
+            READ_BITS_SAFE(sel, 2);
+            if (sel == 3) READ_BITS_SAFE(c, 4); else c += (char) sel-1;
+            lens[i] = c;
+        }
+        break;
+
+    case 3:
+        for (i = 0; i < numsyms; i++) {
+            READ_BITS_SAFE(c, 4); lens[i] = c;
+        }
+        break;
+    }
+    STORE_BITS;
+    return MSPACK_ERR_OK;
+}
+
+static int lzh_read_input(struct kwajd_stream *lzh) {
+    int read;
+    if (lzh->input_end) {
+        lzh->input_end += 8;
+        lzh->inbuf[0] = 0;
+        read = 1;
+    }
+    else {
+        read = lzh->sys->read(lzh->input, &lzh->inbuf[0], KWAJ_INPUT_SIZE);
+        if (read < 0) return MSPACK_ERR_READ;
+        if (read == 0) {
+            lzh->input_end = 8;
+            lzh->inbuf[0] = 0;
+            read = 1;
+        }
+    }
+
+    /* update i_ptr and i_end */
+    lzh->i_ptr = &lzh->inbuf[0];
+    lzh->i_end = &lzh->inbuf[read];
+    return MSPACK_ERR_OK;
+}
diff --git a/utils/rbutilqt/mspack/lit.h b/utils/rbutilqt/mspack/lit.h
new file mode 100644
index 0000000000..2ccc7dd7f3
--- /dev/null
+++ b/utils/rbutilqt/mspack/lit.h
@@ -0,0 +1,35 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_LIT_H
+#define MSPACK_LIT_H 1
+
+#include "lzx.h"
+#include "des.h"
+#include "sha.h"
+
+/* generic LIT definitions */
+
+/* LIT compression definitions */
+
+struct mslit_compressor_p {
+  struct mslit_compressor base;
+  struct mspack_system *system;
+  /* todo */
+};
+
+/* LIT decompression definitions */
+
+struct mslit_decompressor_p {
+  struct mslit_decompressor base;
+  struct mspack_system *system;
+  /* todo */
+};
+
+#endif
diff --git a/utils/rbutilqt/mspack/litc.c b/utils/rbutilqt/mspack/litc.c
new file mode 100644
index 0000000000..4959a81d36
--- /dev/null
+++ b/utils/rbutilqt/mspack/litc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* LIT compression implementation */
+
+#include "system-mspack.h"
+#include "lit.h"
+
+struct mslit_compressor *
+  mspack_create_lit_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_lit_compressor(struct mslit_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/litd.c b/utils/rbutilqt/mspack/litd.c
new file mode 100644
index 0000000000..93cbf1765a
--- /dev/null
+++ b/utils/rbutilqt/mspack/litd.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* LIT decompression implementation */
+
+#include "system-mspack.h"
+#include "lit.h"
+
+struct mslit_decompressor *
+  mspack_create_lit_decompressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_lit_decompressor(struct mslit_decompressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/lzss.h b/utils/rbutilqt/mspack/lzss.h
new file mode 100644
index 0000000000..aa946e52ae
--- /dev/null
+++ b/utils/rbutilqt/mspack/lzss.h
@@ -0,0 +1,66 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_LZSS_H
+#define MSPACK_LZSS_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* LZSS compression / decompression definitions */
+
+#define LZSS_WINDOW_SIZE (4096)
+#define LZSS_WINDOW_FILL (0x20)
+
+#define LZSS_MODE_EXPAND  (0)
+#define LZSS_MODE_MSHELP  (1)
+#define LZSS_MODE_QBASIC  (2)
+
+/**
+ * Decompresses an LZSS stream.
+ *
+ * Input bytes will be read in as necessary using the system->read()
+ * function with the input file handle given. This will continue until
+ * system->read() returns 0 bytes, or an error. Errors will be passed
+ * out of the function as MSPACK_ERR_READ errors. Input streams should
+ * convey an "end of input stream" by refusing to supply all the bytes
+ * that LZSS asks for when they reach the end of the stream, rather
+ * than return an error code.
+ *
+ * Output bytes will be passed to the system->write() function, using
+ * the output file handle given. More than one call may be made to
+ * system->write().
+ *
+ * As EXPAND.EXE (SZDD/KWAJ), Microsoft Help and QBasic have slightly
+ * different encodings for the control byte and matches, a "mode"
+ * parameter is allowed, to choose the encoding.
+ *
+ * @param system             an mspack_system structure used to read from
+ *                           the input stream and write to the output
+ *                           stream, also to allocate and free memory.
+ * @param input              an input stream with the LZSS data.
+ * @param output             an output stream to write the decoded data to.
+ * @param input_buffer_size  the number of bytes to use as an input
+ *                           bitstream buffer.
+ * @param mode               one of #LZSS_MODE_EXPAND, #LZSS_MODE_MSHELP or
+ *                           #LZSS_MODE_QBASIC
+ * @return an error code, or MSPACK_ERR_OK if successful
+ */
+extern int lzss_decompress(struct mspack_system *system,
+                           struct mspack_file *input,
+                           struct mspack_file *output,
+                           int input_buffer_size,
+                           int mode);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/lzssd.c b/utils/rbutilqt/mspack/lzssd.c
new file mode 100644
index 0000000000..63716d414a
--- /dev/null
+++ b/utils/rbutilqt/mspack/lzssd.c
@@ -0,0 +1,93 @@
+/* This file is part of libmspack.
+ * (C) 2003-2010 Stuart Caie.
+ *
+ * LZSS is a derivative of LZ77 and was created by James Storer and
+ * Thomas Szymanski in 1982. Haruhiko Okumura wrote a very popular C
+ * implementation.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#include "system-mspack.h"
+#include "lzss.h"
+
+#define ENSURE_BYTES do {                               \
+    if (i_ptr >= i_end) {                               \
+        read = system->read(input, &inbuf[0],           \
+                            input_buffer_size);         \
+        if (read <= 0) {                                \
+            system->free(window);                       \
+            return (read < 0) ? MSPACK_ERR_READ         \
+                              : MSPACK_ERR_OK;          \
+        }                                               \
+        i_ptr = &inbuf[0]; i_end = &inbuf[read];        \
+    }                                                   \
+} while (0)
+
+#define WRITE_BYTE do {                                 \
+    if (system->write(output, &window[pos], 1) != 1) {  \
+        system->free(window);                           \
+        return MSPACK_ERR_WRITE;                        \
+    }                                                   \
+} while (0)
+
+int lzss_decompress(struct mspack_system *system,
+                    struct mspack_file *input,
+                    struct mspack_file *output,
+                    int input_buffer_size,
+                    int mode)
+{
+    unsigned char *window, *inbuf, *i_ptr, *i_end;
+    unsigned int pos, i, c, invert, mpos, len;
+    int read;
+
+    /* check parameters */
+    if (!system || input_buffer_size < 1 || (mode != LZSS_MODE_EXPAND &&
+        mode != LZSS_MODE_MSHELP && mode != LZSS_MODE_QBASIC))
+    {
+        return MSPACK_ERR_ARGS;
+    }
+
+    /* allocate memory */
+    window = (unsigned char *) system->alloc(system, LZSS_WINDOW_SIZE + input_buffer_size);
+    if (!window) return MSPACK_ERR_NOMEMORY;
+
+    /* initialise decompression */
+    inbuf = &window[LZSS_WINDOW_SIZE];
+    memset(window, LZSS_WINDOW_FILL, (size_t) LZSS_WINDOW_SIZE);
+    pos = LZSS_WINDOW_SIZE - ((mode == LZSS_MODE_QBASIC) ? 18 : 16);
+    invert = (mode == LZSS_MODE_MSHELP) ? ~0 : 0;
+    i_ptr = i_end = &inbuf[0];
+
+    /* loop forever; exit condition is in ENSURE_BYTES macro */
+    for (;;) {
+        ENSURE_BYTES; c = *i_ptr++ ^ invert;
+        for (i = 0x01; i & 0xFF; i <<= 1) {
+            if (c & i) {
+                /* literal */
+                ENSURE_BYTES; window[pos] = *i_ptr++;
+                WRITE_BYTE;
+                pos++; pos &= LZSS_WINDOW_SIZE - 1;
+            }
+            else {
+                /* match */
+                ENSURE_BYTES; mpos = *i_ptr++;
+                ENSURE_BYTES; mpos |= (*i_ptr & 0xF0) << 4;
+                len = (*i_ptr++ & 0x0F) + 3;
+                while (len--) {
+                    window[pos] = window[mpos];
+                    WRITE_BYTE;
+                    pos++;  pos  &= LZSS_WINDOW_SIZE - 1;
+                    mpos++; mpos &= LZSS_WINDOW_SIZE - 1;
+                }
+            }
+        }
+    }
+
+    /* not reached */
+    system->free(window);
+    return MSPACK_ERR_OK;
+}
diff --git a/utils/rbutilqt/mspack/lzx.h b/utils/rbutilqt/mspack/lzx.h
new file mode 100644
index 0000000000..a6152f622b
--- /dev/null
+++ b/utils/rbutilqt/mspack/lzx.h
@@ -0,0 +1,221 @@
+/* This file is part of libmspack.
+ * (C) 2003-2013 Stuart Caie.
+ *
+ * The LZX method was created by Jonathan Forbes and Tomi Poutanen, adapted
+ * by Microsoft Corporation.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_LZX_H
+#define MSPACK_LZX_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* LZX compression / decompression definitions */
+
+/* some constants defined by the LZX specification */
+#define LZX_MIN_MATCH                (2)
+#define LZX_MAX_MATCH                (257)
+#define LZX_NUM_CHARS                (256)
+#define LZX_BLOCKTYPE_INVALID        (0)   /* also blocktypes 4-7 invalid */
+#define LZX_BLOCKTYPE_VERBATIM       (1)
+#define LZX_BLOCKTYPE_ALIGNED        (2)
+#define LZX_BLOCKTYPE_UNCOMPRESSED   (3)
+#define LZX_PRETREE_NUM_ELEMENTS     (20)
+#define LZX_ALIGNED_NUM_ELEMENTS     (8)   /* aligned offset tree #elements */
+#define LZX_NUM_PRIMARY_LENGTHS      (7)   /* this one missing from spec! */
+#define LZX_NUM_SECONDARY_LENGTHS    (249) /* length tree #elements */
+
+/* LZX huffman defines: tweak tablebits as desired */
+#define LZX_PRETREE_MAXSYMBOLS  (LZX_PRETREE_NUM_ELEMENTS)
+#define LZX_PRETREE_TABLEBITS   (6)
+#define LZX_MAINTREE_MAXSYMBOLS (LZX_NUM_CHARS + 290*8)
+#define LZX_MAINTREE_TABLEBITS  (12)
+#define LZX_LENGTH_MAXSYMBOLS   (LZX_NUM_SECONDARY_LENGTHS+1)
+#define LZX_LENGTH_TABLEBITS    (12)
+#define LZX_ALIGNED_MAXSYMBOLS  (LZX_ALIGNED_NUM_ELEMENTS)
+#define LZX_ALIGNED_TABLEBITS   (7)
+#define LZX_LENTABLE_SAFETY (64)  /* table decoding overruns are allowed */
+
+#define LZX_FRAME_SIZE (32768) /* the size of a frame in LZX */
+
+struct lzxd_stream {
+  struct mspack_system *sys;      /* I/O routines                            */
+  struct mspack_file   *input;    /* input file handle                       */
+  struct mspack_file   *output;   /* output file handle                      */
+
+  off_t   offset;                 /* number of bytes actually output         */
+  off_t   length;                 /* overall decompressed length of stream   */
+
+  unsigned char *window;          /* decoding window                         */
+  unsigned int   window_size;     /* window size                             */
+  unsigned int   ref_data_size;   /* LZX DELTA reference data size           */
+  unsigned int   num_offsets;     /* number of match_offset entries in table */
+  unsigned int   window_posn;     /* decompression offset within window      */
+  unsigned int   frame_posn;      /* current frame offset within in window   */
+  unsigned int   frame;           /* the number of 32kb frames processed     */
+  unsigned int   reset_interval;  /* which frame do we reset the compressor? */
+
+  unsigned int   R0, R1, R2;      /* for the LRU offset system               */
+  unsigned int   block_length;    /* uncompressed length of this LZX block   */
+  unsigned int   block_remaining; /* uncompressed bytes still left to decode */
+
+  signed int     intel_filesize;  /* magic header value used for transform   */
+  signed int     intel_curpos;    /* current offset in transform space       */
+
+  unsigned char  intel_started;   /* has intel E8 decoding started?          */
+  unsigned char  block_type;      /* type of the current block               */
+  unsigned char  header_read;     /* have we started decoding at all yet?    */
+  unsigned char  input_end;       /* have we reached the end of input?       */
+  unsigned char  is_delta;        /* does stream follow LZX DELTA spec?      */
+
+  int error;
+
+  /* I/O buffering */
+  unsigned char *inbuf, *i_ptr, *i_end, *o_ptr, *o_end;
+  unsigned int  bit_buffer, bits_left, inbuf_size;
+
+  /* huffman code lengths */
+  unsigned char PRETREE_len  [LZX_PRETREE_MAXSYMBOLS  + LZX_LENTABLE_SAFETY];
+  unsigned char MAINTREE_len [LZX_MAINTREE_MAXSYMBOLS + LZX_LENTABLE_SAFETY];
+  unsigned char LENGTH_len   [LZX_LENGTH_MAXSYMBOLS   + LZX_LENTABLE_SAFETY];
+  unsigned char ALIGNED_len  [LZX_ALIGNED_MAXSYMBOLS  + LZX_LENTABLE_SAFETY];
+
+  /* huffman decoding tables */
+  unsigned short PRETREE_table [(1 << LZX_PRETREE_TABLEBITS) +
+                                (LZX_PRETREE_MAXSYMBOLS * 2)];
+  unsigned short MAINTREE_table[(1 << LZX_MAINTREE_TABLEBITS) +
+                                (LZX_MAINTREE_MAXSYMBOLS * 2)];
+  unsigned short LENGTH_table  [(1 << LZX_LENGTH_TABLEBITS) +
+                                (LZX_LENGTH_MAXSYMBOLS * 2)];
+  unsigned short ALIGNED_table [(1 << LZX_ALIGNED_TABLEBITS) +
+                                (LZX_ALIGNED_MAXSYMBOLS * 2)];
+  unsigned char LENGTH_empty;
+
+  /* this is used purely for doing the intel E8 transform */
+  unsigned char  e8_buf[LZX_FRAME_SIZE];
+};
+
+/**
+ * Allocates and initialises LZX decompression state for decoding an LZX
+ * stream.
+ *
+ * This routine uses system->alloc() to allocate memory. If memory
+ * allocation fails, or the parameters to this function are invalid,
+ * NULL is returned.
+ *
+ * @param system             an mspack_system structure used to read from
+ *                           the input stream and write to the output
+ *                           stream, also to allocate and free memory.
+ * @param input              an input stream with the LZX data.
+ * @param output             an output stream to write the decoded data to.
+ * @param window_bits        the size of the decoding window, which must be
+ *                           between 15 and 21 inclusive for regular LZX
+ *                           data, or between 17 and 25 inclusive for
+ *                           LZX DELTA data.
+ * @param reset_interval     the interval at which the LZX bitstream is
+ *                           reset, in multiples of LZX frames (32678
+ *                           bytes), e.g. a value of 2 indicates the input
+ *                           stream resets after every 65536 output bytes.
+ *                           A value of 0 indicates that the bitstream never
+ *                           resets, such as in CAB LZX streams.
+ * @param input_buffer_size  the number of bytes to use as an input
+ *                           bitstream buffer.
+ * @param output_length      the length in bytes of the entirely
+ *                           decompressed output stream, if known in
+ *                           advance. It is used to correctly perform the
+ *                           Intel E8 transformation, which must stop 6
+ *                           bytes before the very end of the
+ *                           decompressed stream. It is not otherwise used
+ *                           or adhered to. If the full decompressed
+ *                           length is known in advance, set it here.
+ *                           If it is NOT known, use the value 0, and call
+ *                           lzxd_set_output_length() once it is
+ *                           known. If never set, 4 of the final 6 bytes
+ *                           of the output stream may be incorrect.
+ * @param is_delta           should be zero for all regular LZX data,
+ *                           non-zero for LZX DELTA encoded data.
+ * @return a pointer to an initialised lzxd_stream structure, or NULL if
+ * there was not enough memory or parameters to the function were wrong.
+ */
+extern struct lzxd_stream *lzxd_init(struct mspack_system *system,
+                                     struct mspack_file *input,
+                                     struct mspack_file *output,
+                                     int window_bits,
+                                     int reset_interval,
+                                     int input_buffer_size,
+                                     off_t output_length,
+                                     char is_delta);
+
+/* see description of output_length in lzxd_init() */
+extern void lzxd_set_output_length(struct lzxd_stream *lzx,
+                                   off_t output_length);
+
+/**
+ * Reads LZX DELTA reference data into the window and allows
+ * lzxd_decompress() to reference it.
+ *
+ * Call this before the first call to lzxd_decompress().
+
+ * @param lzx    the LZX stream to apply this reference data to
+ * @param system an mspack_system implementation to use with the
+ *               input param. Only read() will be called.
+ * @param input  an input file handle to read reference data using
+ *               system->read().
+ * @param length the length of the reference data. Cannot be longer
+ *               than the LZX window size.
+ * @return an error code, or MSPACK_ERR_OK if successful
+ */
+extern int lzxd_set_reference_data(struct lzxd_stream *lzx,
+                                   struct mspack_system *system,
+                                   struct mspack_file *input,
+                                   unsigned int length);
+
+/**
+ * Decompresses entire or partial LZX streams.
+ *
+ * The number of bytes of data that should be decompressed is given as the
+ * out_bytes parameter. If more bytes are decoded than are needed, they
+ * will be kept over for a later invocation.
+ *
+ * The output bytes will be passed to the system->write() function given in
+ * lzxd_init(), using the output file handle given in lzxd_init(). More than
+ * one call may be made to system->write().
+
+ * Input bytes will be read in as necessary using the system->read()
+ * function given in lzxd_init(), using the input file handle given in
+ * lzxd_init().  This will continue until system->read() returns 0 bytes,
+ * or an error. Errors will be passed out of the function as
+ * MSPACK_ERR_READ errors.  Input streams should convey an "end of input
+ * stream" by refusing to supply all the bytes that LZX asks for when they
+ * reach the end of the stream, rather than return an error code.
+ *
+ * If any error code other than MSPACK_ERR_OK is returned, the stream
+ * should be considered unusable and lzxd_decompress() should not be
+ * called again on this stream.
+ *
+ * @param lzx       LZX decompression state, as allocated by lzxd_init().
+ * @param out_bytes the number of bytes of data to decompress.
+ * @return an error code, or MSPACK_ERR_OK if successful
+ */
+extern int lzxd_decompress(struct lzxd_stream *lzx, off_t out_bytes);
+
+/**
+ * Frees all state associated with an LZX data stream. This will call
+ * system->free() using the system pointer given in lzxd_init().
+ *
+ * @param lzx LZX decompression state to free.
+ */
+void lzxd_free(struct lzxd_stream *lzx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/lzxc.c b/utils/rbutilqt/mspack/lzxc.c
new file mode 100644
index 0000000000..89d8c610ea
--- /dev/null
+++ b/utils/rbutilqt/mspack/lzxc.c
@@ -0,0 +1,18 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * The LZX method was created by Jonathan Forbes and Tomi Poutanen, adapted
+ * by Microsoft Corporation.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* LZX compression implementation */
+
+#include "system-mspack.h"
+#include "lzx.h"
+
+/* todo */
diff --git a/utils/rbutilqt/mspack/lzxd.c b/utils/rbutilqt/mspack/lzxd.c
new file mode 100644
index 0000000000..88cfd90c2a
--- /dev/null
+++ b/utils/rbutilqt/mspack/lzxd.c
@@ -0,0 +1,905 @@
+/* This file is part of libmspack.
+ * (C) 2003-2013 Stuart Caie.
+ *
+ * The LZX method was created by Jonathan Forbes and Tomi Poutanen, adapted
+ * by Microsoft Corporation.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* LZX decompression implementation */
+
+#include "system-mspack.h"
+#include "lzx.h"
+
+/* Microsoft's LZX document (in cab-sdk.exe) and their implementation
+ * of the com.ms.util.cab Java package do not concur.
+ *
+ * In the LZX document, there is a table showing the correlation between
+ * window size and the number of position slots. It states that the 1MB
+ * window = 40 slots and the 2MB window = 42 slots. In the implementation,
+ * 1MB = 42 slots, 2MB = 50 slots. The actual calculation is 'find the
+ * first slot whose position base is equal to or more than the required
+ * window size'. This would explain why other tables in the document refer
+ * to 50 slots rather than 42.
+ *
+ * The constant NUM_PRIMARY_LENGTHS used in the decompression pseudocode
+ * is not defined in the specification.
+ *
+ * The LZX document does not state the uncompressed block has an
+ * uncompressed length field. Where does this length field come from, so
+ * we can know how large the block is? The implementation has it as the 24
+ * bits following after the 3 blocktype bits, before the alignment
+ * padding.
+ *
+ * The LZX document states that aligned offset blocks have their aligned
+ * offset huffman tree AFTER the main and length trees. The implementation
+ * suggests that the aligned offset tree is BEFORE the main and length
+ * trees.
+ *
+ * The LZX document decoding algorithm states that, in an aligned offset
+ * block, if an extra_bits value is 1, 2 or 3, then that number of bits
+ * should be read and the result added to the match offset. This is
+ * correct for 1 and 2, but not 3, where just a huffman symbol (using the
+ * aligned tree) should be read.
+ *
+ * Regarding the E8 preprocessing, the LZX document states 'No translation
+ * may be performed on the last 6 bytes of the input block'. This is
+ * correct.  However, the pseudocode provided checks for the *E8 leader*
+ * up to the last 6 bytes. If the leader appears between -10 and -7 bytes
+ * from the end, this would cause the next four bytes to be modified, at
+ * least one of which would be in the last 6 bytes, which is not allowed
+ * according to the spec.
+ *
+ * The specification states that the huffman trees must always contain at
+ * least one element. However, many CAB files contain blocks where the
+ * length tree is completely empty (because there are no matches), and
+ * this is expected to succeed.
+ *
+ * The errors in LZX documentation appear have been corrected in the
+ * new documentation for the LZX DELTA format.
+ *
+ *     http://msdn.microsoft.com/en-us/library/cc483133.aspx
+ *
+ * However, this is a different format, an extension of regular LZX.
+ * I have noticed the following differences, there may be more:
+ *
+ * The maximum window size has increased from 2MB to 32MB. This also
+ * increases the maximum number of position slots, etc.
+ *
+ * If the match length is 257 (the maximum possible), this signals
+ * a further length decoding step, that allows for matches up to
+ * 33024 bytes long.
+ *
+ * The format now allows for "reference data", supplied by the caller.
+ * If match offsets go further back than the number of bytes
+ * decompressed so far, that is them accessing the reference data.
+ */
+
+/* import bit-reading macros and code */
+#define BITS_TYPE struct lzxd_stream
+#define BITS_VAR lzx
+#define BITS_ORDER_MSB
+#define READ_BYTES do {                 \
+    unsigned char b0, b1;               \
+    READ_IF_NEEDED; b0 = *i_ptr++;      \
+    READ_IF_NEEDED; b1 = *i_ptr++;      \
+    INJECT_BITS((b1 << 8) | b0, 16);    \
+} while (0)
+#include "readbits.h"
+
+/* import huffman-reading macros and code */
+#define TABLEBITS(tbl)      LZX_##tbl##_TABLEBITS
+#define MAXSYMBOLS(tbl)     LZX_##tbl##_MAXSYMBOLS
+#define HUFF_TABLE(tbl,idx) lzx->tbl##_table[idx]
+#define HUFF_LEN(tbl,idx)   lzx->tbl##_len[idx]
+#define HUFF_ERROR          return lzx->error = MSPACK_ERR_DECRUNCH
+#include "readhuff.h"
+
+/* BUILD_TABLE(tbl) builds a huffman lookup table from code lengths */
+#define BUILD_TABLE(tbl)                                                \
+    if (make_decode_table(MAXSYMBOLS(tbl), TABLEBITS(tbl),              \
+                          &HUFF_LEN(tbl,0), &HUFF_TABLE(tbl,0)))        \
+    {                                                                   \
+        D(("failed to build %s table", #tbl))                           \
+        return lzx->error = MSPACK_ERR_DECRUNCH;                        \
+    }
+
+#define BUILD_TABLE_MAYBE_EMPTY(tbl) do {                               \
+    lzx->tbl##_empty = 0;                                               \
+    if (make_decode_table(MAXSYMBOLS(tbl), TABLEBITS(tbl),              \
+                          &HUFF_LEN(tbl,0), &HUFF_TABLE(tbl,0)))        \
+    {                                                                   \
+        for (i = 0; i < MAXSYMBOLS(tbl); i++) {                         \
+            if (HUFF_LEN(tbl, i) > 0) {                                 \
+                D(("failed to build %s table", #tbl))                   \
+                return lzx->error = MSPACK_ERR_DECRUNCH;                \
+            }                                                           \
+        }                                                               \
+        /* empty tree - allow it, but don't decode symbols with it */   \
+        lzx->tbl##_empty = 1;                                           \
+    }                                                                   \
+} while (0)
+
+/* READ_LENGTHS(tablename, first, last) reads in code lengths for symbols
+ * first to last in the given table. The code lengths are stored in their
+ * own special LZX way.
+ */
+#define READ_LENGTHS(tbl, first, last) do {             \
+  STORE_BITS;                                           \
+  if (lzxd_read_lens(lzx, &HUFF_LEN(tbl, 0), (first),   \
+    (unsigned int)(last))) return lzx->error;           \
+  RESTORE_BITS;                                         \
+} while (0)
+
+static int lzxd_read_lens(struct lzxd_stream *lzx, unsigned char *lens,
+                          unsigned int first, unsigned int last)
+{
+  /* bit buffer and huffman symbol decode variables */
+  register unsigned int bit_buffer;
+  register int bits_left, i;
+  register unsigned short sym;
+  unsigned char *i_ptr, *i_end;
+
+  unsigned int x, y;
+  int z;
+
+  RESTORE_BITS;
+  
+  /* read lengths for pretree (20 symbols, lengths stored in fixed 4 bits) */
+  for (x = 0; x < 20; x++) {
+    READ_BITS(y, 4);
+    lzx->PRETREE_len[x] = y;
+  }
+  BUILD_TABLE(PRETREE);
+
+  for (x = first; x < last; ) {
+    READ_HUFFSYM(PRETREE, z);
+    if (z == 17) {
+      /* code = 17, run of ([read 4 bits]+4) zeros */
+      READ_BITS(y, 4); y += 4;
+      while (y--) lens[x++] = 0;
+    }
+    else if (z == 18) {
+      /* code = 18, run of ([read 5 bits]+20) zeros */
+      READ_BITS(y, 5); y += 20;
+      while (y--) lens[x++] = 0;
+    }
+    else if (z == 19) {
+      /* code = 19, run of ([read 1 bit]+4) [read huffman symbol] */
+      READ_BITS(y, 1); y += 4;
+      READ_HUFFSYM(PRETREE, z);
+      z = lens[x] - z; if (z < 0) z += 17;
+      while (y--) lens[x++] = z;
+    }
+    else {
+      /* code = 0 to 16, delta current length entry */
+      z = lens[x] - z; if (z < 0) z += 17;
+      lens[x++] = z;
+    }
+  }
+
+  STORE_BITS;
+
+  return MSPACK_ERR_OK;
+}
+
+/* LZX static data tables:
+ *
+ * LZX uses 'position slots' to represent match offsets.  For every match,
+ * a small 'position slot' number and a small offset from that slot are
+ * encoded instead of one large offset.
+ *
+ * The number of slots is decided by how many are needed to encode the
+ * largest offset for a given window size. This is easy when the gap between
+ * slots is less than 128Kb, it's a linear relationship. But when extra_bits
+ * reaches its limit of 17 (because LZX can only ensure reading 17 bits of
+ * data at a time), we can only jump 128Kb at a time and have to start
+ * using more and more position slots as each window size doubles.
+ *
+ * position_base[] is an index to the position slot bases
+ *
+ * extra_bits[] states how many bits of offset-from-base data is needed.
+ *
+ * They are calculated as follows:
+ * extra_bits[i] = 0 where i < 4
+ * extra_bits[i] = floor(i/2)-1 where i >= 4 && i < 36
+ * extra_bits[i] = 17 where i >= 36
+ * position_base[0] = 0
+ * position_base[i] = position_base[i-1] + (1 << extra_bits[i-1])
+ */
+static const unsigned int position_slots[11] = {
+    30, 32, 34, 36, 38, 42, 50, 66, 98, 162, 290
+};
+static const unsigned char extra_bits[36] = {
+    0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8,
+    9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16
+};
+static const unsigned int position_base[290] = {
+    0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 512,
+    768, 1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384, 24576, 32768,
+    49152, 65536, 98304, 131072, 196608, 262144, 393216, 524288, 655360,
+    786432, 917504, 1048576, 1179648, 1310720, 1441792, 1572864, 1703936,
+    1835008, 1966080, 2097152, 2228224, 2359296, 2490368, 2621440, 2752512,
+    2883584, 3014656, 3145728, 3276800, 3407872, 3538944, 3670016, 3801088,
+    3932160, 4063232, 4194304, 4325376, 4456448, 4587520, 4718592, 4849664,
+    4980736, 5111808, 5242880, 5373952, 5505024, 5636096, 5767168, 5898240,
+    6029312, 6160384, 6291456, 6422528, 6553600, 6684672, 6815744, 6946816,
+    7077888, 7208960, 7340032, 7471104, 7602176, 7733248, 7864320, 7995392,
+    8126464, 8257536, 8388608, 8519680, 8650752, 8781824, 8912896, 9043968,
+    9175040, 9306112, 9437184, 9568256, 9699328, 9830400, 9961472, 10092544,
+    10223616, 10354688, 10485760, 10616832, 10747904, 10878976, 11010048,
+    11141120, 11272192, 11403264, 11534336, 11665408, 11796480, 11927552,
+    12058624, 12189696, 12320768, 12451840, 12582912, 12713984, 12845056,
+    12976128, 13107200, 13238272, 13369344, 13500416, 13631488, 13762560,
+    13893632, 14024704, 14155776, 14286848, 14417920, 14548992, 14680064,
+    14811136, 14942208, 15073280, 15204352, 15335424, 15466496, 15597568,
+    15728640, 15859712, 15990784, 16121856, 16252928, 16384000, 16515072,
+    16646144, 16777216, 16908288, 17039360, 17170432, 17301504, 17432576,
+    17563648, 17694720, 17825792, 17956864, 18087936, 18219008, 18350080,
+    18481152, 18612224, 18743296, 18874368, 19005440, 19136512, 19267584,
+    19398656, 19529728, 19660800, 19791872, 19922944, 20054016, 20185088,
+    20316160, 20447232, 20578304, 20709376, 20840448, 20971520, 21102592,
+    21233664, 21364736, 21495808, 21626880, 21757952, 21889024, 22020096,
+    22151168, 22282240, 22413312, 22544384, 22675456, 22806528, 22937600,
+    23068672, 23199744, 23330816, 23461888, 23592960, 23724032, 23855104,
+    23986176, 24117248, 24248320, 24379392, 24510464, 24641536, 24772608,
+    24903680, 25034752, 25165824, 25296896, 25427968, 25559040, 25690112,
+    25821184, 25952256, 26083328, 26214400, 26345472, 26476544, 26607616,
+    26738688, 26869760, 27000832, 27131904, 27262976, 27394048, 27525120,
+    27656192, 27787264, 27918336, 28049408, 28180480, 28311552, 28442624,
+    28573696, 28704768, 28835840, 28966912, 29097984, 29229056, 29360128,
+    29491200, 29622272, 29753344, 29884416, 30015488, 30146560, 30277632,
+    30408704, 30539776, 30670848, 30801920, 30932992, 31064064, 31195136,
+    31326208, 31457280, 31588352, 31719424, 31850496, 31981568, 32112640,
+    32243712, 32374784, 32505856, 32636928, 32768000, 32899072, 33030144,
+    33161216, 33292288, 33423360
+};
+
+static void lzxd_reset_state(struct lzxd_stream *lzx) {
+  int i;
+
+  lzx->R0              = 1;
+  lzx->R1              = 1;
+  lzx->R2              = 1;
+  lzx->header_read     = 0;
+  lzx->block_remaining = 0;
+  lzx->block_type      = LZX_BLOCKTYPE_INVALID;
+
+  /* initialise tables to 0 (because deltas will be applied to them) */
+  for (i = 0; i < LZX_MAINTREE_MAXSYMBOLS; i++) lzx->MAINTREE_len[i] = 0;
+  for (i = 0; i < LZX_LENGTH_MAXSYMBOLS; i++)   lzx->LENGTH_len[i]   = 0;
+}
+
+/*-------- main LZX code --------*/
+
+struct lzxd_stream *lzxd_init(struct mspack_system *system,
+                              struct mspack_file *input,
+                              struct mspack_file *output,
+                              int window_bits,
+                              int reset_interval,
+                              int input_buffer_size,
+                              off_t output_length,
+                              char is_delta)
+{
+  unsigned int window_size = 1 << window_bits;
+  struct lzxd_stream *lzx;
+
+  if (!system) return NULL;
+
+  /* LZX DELTA window sizes are between 2^17 (128KiB) and 2^25 (32MiB),
+   * regular LZX windows are between 2^15 (32KiB) and 2^21 (2MiB)
+   */
+  if (is_delta) {
+      if (window_bits < 17 || window_bits > 25) return NULL;
+  }
+  else {
+      if (window_bits < 15 || window_bits > 21) return NULL;
+  }
+
+  if (reset_interval < 0 || output_length < 0) {
+      D(("reset interval or output length < 0"))
+      return NULL;
+  }
+
+  /* round up input buffer size to multiple of two */
+  input_buffer_size = (input_buffer_size + 1) & -2;
+  if (input_buffer_size < 2) return NULL;
+
+  /* allocate decompression state */
+  if (!(lzx = (struct lzxd_stream *) system->alloc(system, sizeof(struct lzxd_stream)))) {
+    return NULL;
+  }
+
+  /* allocate decompression window and input buffer */
+  lzx->window = (unsigned char *) system->alloc(system, (size_t) window_size);
+  lzx->inbuf  = (unsigned char *) system->alloc(system, (size_t) input_buffer_size);
+  if (!lzx->window || !lzx->inbuf) {
+    system->free(lzx->window);
+    system->free(lzx->inbuf);
+    system->free(lzx);
+    return NULL;
+  }
+
+  /* initialise decompression state */
+  lzx->sys             = system;
+  lzx->input           = input;
+  lzx->output          = output;
+  lzx->offset          = 0;
+  lzx->length          = output_length;
+
+  lzx->inbuf_size      = input_buffer_size;
+  lzx->window_size     = 1 << window_bits;
+  lzx->ref_data_size   = 0;
+  lzx->window_posn     = 0;
+  lzx->frame_posn      = 0;
+  lzx->frame           = 0;
+  lzx->reset_interval  = reset_interval;
+  lzx->intel_filesize  = 0;
+  lzx->intel_curpos    = 0;
+  lzx->intel_started   = 0;
+  lzx->error           = MSPACK_ERR_OK;
+  lzx->num_offsets     = position_slots[window_bits - 15] << 3;
+  lzx->is_delta        = is_delta;
+
+  lzx->o_ptr = lzx->o_end = &lzx->e8_buf[0];
+  lzxd_reset_state(lzx);
+  INIT_BITS;
+  return lzx;
+}
+
+int lzxd_set_reference_data(struct lzxd_stream *lzx,
+                            struct mspack_system *system,
+                            struct mspack_file *input,
+                            unsigned int length)
+{
+    if (!lzx) return MSPACK_ERR_ARGS;
+
+    if (!lzx->is_delta) {
+        D(("only LZX DELTA streams support reference data"))
+        return MSPACK_ERR_ARGS;
+    }
+    if (lzx->offset) {
+        D(("too late to set reference data after decoding starts"))
+        return MSPACK_ERR_ARGS;
+    }
+    if (length > lzx->window_size) {
+        D(("reference length (%u) is longer than the window", length))
+        return MSPACK_ERR_ARGS;
+    }
+    if (length > 0 && (!system || !input)) {
+        D(("length > 0 but no system or input"))
+        return MSPACK_ERR_ARGS;
+    }
+
+    lzx->ref_data_size = length;
+    if (length > 0) {
+        /* copy reference data */
+        unsigned char *pos = &lzx->window[lzx->window_size - length];
+        int bytes = system->read(input, pos, length);
+        /* length can't be more than 2^25, so no signedness problem */
+        if (bytes < (int)length) return MSPACK_ERR_READ;
+    }
+    lzx->ref_data_size = length;
+    return MSPACK_ERR_OK;
+}
+
+void lzxd_set_output_length(struct lzxd_stream *lzx, off_t out_bytes) {
+  if (lzx && out_bytes > 0) lzx->length = out_bytes;
+}
+
+int lzxd_decompress(struct lzxd_stream *lzx, off_t out_bytes) {
+  /* bitstream and huffman reading variables */
+  register unsigned int bit_buffer;
+  register int bits_left, i=0;
+  unsigned char *i_ptr, *i_end;
+  register unsigned short sym;
+
+  int match_length, length_footer, extra, verbatim_bits, bytes_todo;
+  int this_run, main_element, aligned_bits, j, warned = 0;
+  unsigned char *window, *runsrc, *rundest, buf[12];
+  unsigned int frame_size=0, end_frame, match_offset, window_posn;
+  unsigned int R0, R1, R2;
+
+  /* easy answers */
+  if (!lzx || (out_bytes < 0)) return MSPACK_ERR_ARGS;
+  if (lzx->error) return lzx->error;
+
+  /* flush out any stored-up bytes before we begin */
+  i = lzx->o_end - lzx->o_ptr;
+  if ((off_t) i > out_bytes) i = (int) out_bytes;
+  if (i) {
+    if (lzx->sys->write(lzx->output, lzx->o_ptr, i) != i) {
+      return lzx->error = MSPACK_ERR_WRITE;
+    }
+    lzx->o_ptr  += i;
+    lzx->offset += i;
+    out_bytes   -= i;
+  }
+  if (out_bytes == 0) return MSPACK_ERR_OK;
+
+  /* restore local state */
+  RESTORE_BITS;
+  window = lzx->window;
+  window_posn = lzx->window_posn;
+  R0 = lzx->R0;
+  R1 = lzx->R1;
+  R2 = lzx->R2;
+
+  end_frame = (unsigned int)((lzx->offset + out_bytes) / LZX_FRAME_SIZE) + 1;
+
+  while (lzx->frame < end_frame) {
+    /* have we reached the reset interval? (if there is one?) */
+    if (lzx->reset_interval && ((lzx->frame % lzx->reset_interval) == 0)) {
+      if (lzx->block_remaining) {
+        /* this is a file format error, we can make a best effort to extract what we can */
+        D(("%d bytes remaining at reset interval", lzx->block_remaining))
+        if (!warned) {
+          lzx->sys->message(NULL, "WARNING; invalid reset interval detected during LZX decompression");
+          warned++;
+        }
+      }
+
+      /* re-read the intel header and reset the huffman lengths */
+      lzxd_reset_state(lzx);
+      R0 = lzx->R0;
+      R1 = lzx->R1;
+      R2 = lzx->R2;
+    }
+
+    /* LZX DELTA format has chunk_size, not present in LZX format */
+    if (lzx->is_delta) {
+      ENSURE_BITS(16);
+      REMOVE_BITS(16);
+    }
+
+    /* read header if necessary */
+    if (!lzx->header_read) {
+      /* read 1 bit. if bit=0, intel filesize = 0.
+       * if bit=1, read intel filesize (32 bits) */
+      j = 0; READ_BITS(i, 1); if (i) { READ_BITS(i, 16); READ_BITS(j, 16); }
+      lzx->intel_filesize = (i << 16) | j;
+      lzx->header_read = 1;
+    } 
+
+    /* calculate size of frame: all frames are 32k except the final frame
+     * which is 32kb or less. this can only be calculated when lzx->length
+     * has been filled in. */
+    frame_size = LZX_FRAME_SIZE;
+    if (lzx->length && (lzx->length - lzx->offset) < (off_t)frame_size) {
+      frame_size = lzx->length - lzx->offset;
+    }
+
+    /* decode until one more frame is available */
+    bytes_todo = lzx->frame_posn + frame_size - window_posn;
+    while (bytes_todo > 0) {
+      /* initialise new block, if one is needed */
+      if (lzx->block_remaining == 0) {
+        /* realign if previous block was an odd-sized UNCOMPRESSED block */
+        if ((lzx->block_type == LZX_BLOCKTYPE_UNCOMPRESSED) &&
+            (lzx->block_length & 1))
+        {
+          READ_IF_NEEDED;
+          i_ptr++;
+        }
+
+        /* read block type (3 bits) and block length (24 bits) */
+        READ_BITS(lzx->block_type, 3);
+        READ_BITS(i, 16); READ_BITS(j, 8);
+        lzx->block_remaining = lzx->block_length = (i << 8) | j;
+        /*D(("new block t%d len %u", lzx->block_type, lzx->block_length))*/
+
+        /* read individual block headers */
+        switch (lzx->block_type) {
+        case LZX_BLOCKTYPE_ALIGNED:
+          /* read lengths of and build aligned huffman decoding tree */
+          for (i = 0; i < 8; i++) { READ_BITS(j, 3); lzx->ALIGNED_len[i] = j; }
+          BUILD_TABLE(ALIGNED);
+          /* rest of aligned header is same as verbatim */ /*@fallthrough@*/
+        case LZX_BLOCKTYPE_VERBATIM:
+          /* read lengths of and build main huffman decoding tree */
+          READ_LENGTHS(MAINTREE, 0, 256);
+          READ_LENGTHS(MAINTREE, 256, LZX_NUM_CHARS + lzx->num_offsets);
+          BUILD_TABLE(MAINTREE);
+          /* if the literal 0xE8 is anywhere in the block... */
+          if (lzx->MAINTREE_len[0xE8] != 0) lzx->intel_started = 1;
+          /* read lengths of and build lengths huffman decoding tree */
+          READ_LENGTHS(LENGTH, 0, LZX_NUM_SECONDARY_LENGTHS);
+          BUILD_TABLE_MAYBE_EMPTY(LENGTH);
+          break;
+
+        case LZX_BLOCKTYPE_UNCOMPRESSED:
+          /* because we can't assume otherwise */
+          lzx->intel_started = 1;
+
+          /* read 1-16 (not 0-15) bits to align to bytes */
+          if (bits_left == 0) ENSURE_BITS(16);
+          bits_left = 0; bit_buffer = 0;
+
+          /* read 12 bytes of stored R0 / R1 / R2 values */
+          for (rundest = &buf[0], i = 0; i < 12; i++) {
+            READ_IF_NEEDED;
+            *rundest++ = *i_ptr++;
+          }
+          R0 = buf[0] | (buf[1] << 8) | (buf[2]  << 16) | (buf[3]  << 24);
+          R1 = buf[4] | (buf[5] << 8) | (buf[6]  << 16) | (buf[7]  << 24);
+          R2 = buf[8] | (buf[9] << 8) | (buf[10] << 16) | (buf[11] << 24);
+          break;
+
+        default:
+          D(("bad block type"))
+          return lzx->error = MSPACK_ERR_DECRUNCH;
+        }
+      }
+
+      /* decode more of the block:
+       * run = min(what's available, what's needed) */
+      this_run = lzx->block_remaining;
+      if (this_run > bytes_todo) this_run = bytes_todo;
+
+      /* assume we decode exactly this_run bytes, for now */
+      bytes_todo           -= this_run;
+      lzx->block_remaining -= this_run;
+
+      /* decode at least this_run bytes */
+      switch (lzx->block_type) {
+      case LZX_BLOCKTYPE_VERBATIM:
+        while (this_run > 0) {
+          READ_HUFFSYM(MAINTREE, main_element);
+          if (main_element < LZX_NUM_CHARS) {
+            /* literal: 0 to LZX_NUM_CHARS-1 */
+            window[window_posn++] = main_element;
+            this_run--;
+          }
+          else {
+            /* match: LZX_NUM_CHARS + ((slot<<3) | length_header (3 bits)) */
+            main_element -= LZX_NUM_CHARS;
+
+            /* get match length */
+            match_length = main_element & LZX_NUM_PRIMARY_LENGTHS;
+            if (match_length == LZX_NUM_PRIMARY_LENGTHS) {
+              if (lzx->LENGTH_empty) {
+                D(("LENGTH symbol needed but tree is empty"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              }
+              READ_HUFFSYM(LENGTH, length_footer);
+              match_length += length_footer;
+            }
+            match_length += LZX_MIN_MATCH;
+
+            /* get match offset */
+            switch ((match_offset = (main_element >> 3))) {
+            case 0: match_offset = R0;                                  break;
+            case 1: match_offset = R1; R1=R0;        R0 = match_offset; break;
+            case 2: match_offset = R2; R2=R0;        R0 = match_offset; break;
+            case 3: match_offset = 1;  R2=R1; R1=R0; R0 = match_offset; break;
+            default:
+              extra = (match_offset >= 36) ? 17 : extra_bits[match_offset];
+              READ_BITS(verbatim_bits, extra);
+              match_offset = position_base[match_offset] - 2 + verbatim_bits;
+              R2 = R1; R1 = R0; R0 = match_offset;
+            }
+
+            /* LZX DELTA uses max match length to signal even longer match */
+            if (match_length == LZX_MAX_MATCH && lzx->is_delta) {
+                int extra_len = 0;
+                ENSURE_BITS(3); /* 4 entry huffman tree */
+                if (PEEK_BITS(1) == 0) {
+                    REMOVE_BITS(1); /* '0' -> 8 extra length bits */
+                    READ_BITS(extra_len, 8);
+                }
+                else if (PEEK_BITS(2) == 2) {
+                    REMOVE_BITS(2); /* '10' -> 10 extra length bits + 0x100 */
+                    READ_BITS(extra_len, 10);
+                    extra_len += 0x100;
+                }
+                else if (PEEK_BITS(3) == 6) {
+                    REMOVE_BITS(3); /* '110' -> 12 extra length bits + 0x500 */
+                    READ_BITS(extra_len, 12);
+                    extra_len += 0x500;
+                }
+                else {
+                    REMOVE_BITS(3); /* '111' -> 15 extra length bits */
+                    READ_BITS(extra_len, 15);
+                }
+                match_length += extra_len;
+            }
+
+            if ((window_posn + match_length) > lzx->window_size) {
+              D(("match ran over window wrap"))
+              return lzx->error = MSPACK_ERR_DECRUNCH;
+            }
+            
+            /* copy match */
+            rundest = &window[window_posn];
+            i = match_length;
+            /* does match offset wrap the window? */
+            if (match_offset > window_posn) {
+              if (match_offset > lzx->offset &&
+                  (match_offset - window_posn) > lzx->ref_data_size)
+              {
+                D(("match offset beyond LZX stream"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              }
+              /* j = length from match offset to end of window */
+              j = match_offset - window_posn;
+              if (j > (int) lzx->window_size) {
+                D(("match offset beyond window boundaries"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              }
+              runsrc = &window[lzx->window_size - j];
+              if (j < i) {
+                /* if match goes over the window edge, do two copy runs */
+                i -= j; while (j-- > 0) *rundest++ = *runsrc++;
+                runsrc = window;
+              }
+              while (i-- > 0) *rundest++ = *runsrc++;
+            }
+            else {
+              runsrc = rundest - match_offset;
+              while (i-- > 0) *rundest++ = *runsrc++;
+            }
+
+            this_run    -= match_length;
+            window_posn += match_length;
+          }
+        } /* while (this_run > 0) */
+        break;
+
+      case LZX_BLOCKTYPE_ALIGNED:
+        while (this_run > 0) {
+          READ_HUFFSYM(MAINTREE, main_element);
+          if (main_element < LZX_NUM_CHARS) {
+            /* literal: 0 to LZX_NUM_CHARS-1 */
+            window[window_posn++] = main_element;
+            this_run--;
+          }
+          else {
+            /* match: LZX_NUM_CHARS + ((slot<<3) | length_header (3 bits)) */
+            main_element -= LZX_NUM_CHARS;
+
+            /* get match length */
+            match_length = main_element & LZX_NUM_PRIMARY_LENGTHS;
+            if (match_length == LZX_NUM_PRIMARY_LENGTHS) {
+              if (lzx->LENGTH_empty) {
+                D(("LENGTH symbol needed but tree is empty"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              } 
+              READ_HUFFSYM(LENGTH, length_footer);
+              match_length += length_footer;
+            }
+            match_length += LZX_MIN_MATCH;
+
+            /* get match offset */
+            switch ((match_offset = (main_element >> 3))) {
+            case 0: match_offset = R0;                             break;
+            case 1: match_offset = R1; R1 = R0; R0 = match_offset; break;
+            case 2: match_offset = R2; R2 = R0; R0 = match_offset; break;
+            default:
+              extra = (match_offset >= 36) ? 17 : extra_bits[match_offset];
+              match_offset = position_base[match_offset] - 2;
+              if (extra > 3) {
+                /* verbatim and aligned bits */
+                extra -= 3;
+                READ_BITS(verbatim_bits, extra);
+                match_offset += (verbatim_bits << 3);
+                READ_HUFFSYM(ALIGNED, aligned_bits);
+                match_offset += aligned_bits;
+              }
+              else if (extra == 3) {
+                /* aligned bits only */
+                READ_HUFFSYM(ALIGNED, aligned_bits);
+                match_offset += aligned_bits;
+              }
+              else if (extra > 0) { /* extra==1, extra==2 */
+                /* verbatim bits only */
+                READ_BITS(verbatim_bits, extra);
+                match_offset += verbatim_bits;
+              }
+              else /* extra == 0 */ {
+                /* ??? not defined in LZX specification! */
+                match_offset = 1;
+              }
+              /* update repeated offset LRU queue */
+              R2 = R1; R1 = R0; R0 = match_offset;
+            }
+
+            /* LZX DELTA uses max match length to signal even longer match */
+            if (match_length == LZX_MAX_MATCH && lzx->is_delta) {
+                int extra_len = 0;
+                ENSURE_BITS(3); /* 4 entry huffman tree */
+                if (PEEK_BITS(1) == 0) {
+                    REMOVE_BITS(1); /* '0' -> 8 extra length bits */
+                    READ_BITS(extra_len, 8);
+                }
+                else if (PEEK_BITS(2) == 2) {
+                    REMOVE_BITS(2); /* '10' -> 10 extra length bits + 0x100 */
+                    READ_BITS(extra_len, 10);
+                    extra_len += 0x100;
+                }
+                else if (PEEK_BITS(3) == 6) {
+                    REMOVE_BITS(3); /* '110' -> 12 extra length bits + 0x500 */
+                    READ_BITS(extra_len, 12);
+                    extra_len += 0x500;
+                }
+                else {
+                    REMOVE_BITS(3); /* '111' -> 15 extra length bits */
+                    READ_BITS(extra_len, 15);
+                }
+                match_length += extra_len;
+            }
+
+            if ((window_posn + match_length) > lzx->window_size) {
+              D(("match ran over window wrap"))
+              return lzx->error = MSPACK_ERR_DECRUNCH;
+            }
+
+            /* copy match */
+            rundest = &window[window_posn];
+            i = match_length;
+            /* does match offset wrap the window? */
+            if (match_offset > window_posn) {
+              if (match_offset > lzx->offset &&
+                  (match_offset - window_posn) > lzx->ref_data_size)
+              {
+                D(("match offset beyond LZX stream"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              }
+              /* j = length from match offset to end of window */
+              j = match_offset - window_posn;
+              if (j > (int) lzx->window_size) {
+                D(("match offset beyond window boundaries"))
+                return lzx->error = MSPACK_ERR_DECRUNCH;
+              }
+              runsrc = &window[lzx->window_size - j];
+              if (j < i) {
+                /* if match goes over the window edge, do two copy runs */
+                i -= j; while (j-- > 0) *rundest++ = *runsrc++;
+                runsrc = window;
+              }
+              while (i-- > 0) *rundest++ = *runsrc++;
+            }
+            else {
+              runsrc = rundest - match_offset;
+              while (i-- > 0) *rundest++ = *runsrc++;
+            }
+
+            this_run    -= match_length;
+            window_posn += match_length;
+          }
+        } /* while (this_run > 0) */
+        break;
+
+      case LZX_BLOCKTYPE_UNCOMPRESSED:
+        /* as this_run is limited not to wrap a frame, this also means it
+         * won't wrap the window (as the window is a multiple of 32k) */
+        rundest = &window[window_posn];
+        window_posn += this_run;
+        while (this_run > 0) {
+          if ((i = i_end - i_ptr) == 0) {
+            READ_IF_NEEDED;
+          }
+          else {
+            if (i > this_run) i = this_run;
+            lzx->sys->copy(i_ptr, rundest, (size_t) i);
+            rundest  += i;
+            i_ptr    += i;
+            this_run -= i;
+          }
+        }
+        break;
+
+      default:
+        return lzx->error = MSPACK_ERR_DECRUNCH; /* might as well */
+      }
+
+      /* did the final match overrun our desired this_run length? */
+      if (this_run < 0) {
+        if ((unsigned int)(-this_run) > lzx->block_remaining) {
+          D(("overrun went past end of block by %d (%d remaining)",
+             -this_run, lzx->block_remaining ))
+          return lzx->error = MSPACK_ERR_DECRUNCH;
+        }
+        lzx->block_remaining -= -this_run;
+      }
+    } /* while (bytes_todo > 0) */
+
+    /* streams don't extend over frame boundaries */
+    if ((window_posn - lzx->frame_posn) != frame_size) {
+      D(("decode beyond output frame limits! %d != %d",
+         window_posn - lzx->frame_posn, frame_size))
+      return lzx->error = MSPACK_ERR_DECRUNCH;
+    }
+
+    /* re-align input bitstream */
+    if (bits_left > 0) ENSURE_BITS(16);
+    if (bits_left & 15) REMOVE_BITS(bits_left & 15);
+
+    /* check that we've used all of the previous frame first */
+    if (lzx->o_ptr != lzx->o_end) {
+      D(("%ld avail bytes, new %d frame",
+          (long)(lzx->o_end - lzx->o_ptr), frame_size))
+      return lzx->error = MSPACK_ERR_DECRUNCH;
+    }
+
+    /* does this intel block _really_ need decoding? */
+    if (lzx->intel_started && lzx->intel_filesize &&
+        (lzx->frame <= 32768) && (frame_size > 10))
+    {
+      unsigned char *data    = &lzx->e8_buf[0];
+      unsigned char *dataend = &lzx->e8_buf[frame_size - 10];
+      signed int curpos      = lzx->intel_curpos;
+      signed int filesize    = lzx->intel_filesize;
+      signed int abs_off, rel_off;
+
+      /* copy e8 block to the e8 buffer and tweak if needed */
+      lzx->o_ptr = data;
+      lzx->sys->copy(&lzx->window[lzx->frame_posn], data, frame_size);
+
+      while (data < dataend) {
+        if (*data++ != 0xE8) { curpos++; continue; }
+        abs_off = data[0] | (data[1]<<8) | (data[2]<<16) | (data[3]<<24);
+        if ((abs_off >= -curpos) && (abs_off < filesize)) {
+          rel_off = (abs_off >= 0) ? abs_off - curpos : abs_off + filesize;
+          data[0] = (unsigned char) rel_off;
+          data[1] = (unsigned char) (rel_off >> 8);
+          data[2] = (unsigned char) (rel_off >> 16);
+          data[3] = (unsigned char) (rel_off >> 24);
+        }
+        data += 4;
+        curpos += 5;
+      }
+      lzx->intel_curpos += frame_size;
+    }
+    else {
+      lzx->o_ptr = &lzx->window[lzx->frame_posn];
+      if (lzx->intel_filesize) lzx->intel_curpos += frame_size;
+    }
+    lzx->o_end = &lzx->o_ptr[frame_size];
+
+    /* write a frame */
+    i = (out_bytes < (off_t)frame_size) ? (unsigned int)out_bytes : frame_size;
+    if (lzx->sys->write(lzx->output, lzx->o_ptr, i) != i) {
+      return lzx->error = MSPACK_ERR_WRITE;
+    }
+    lzx->o_ptr  += i;
+    lzx->offset += i;
+    out_bytes   -= i;
+
+    /* advance frame start position */
+    lzx->frame_posn += frame_size;
+    lzx->frame++;
+
+    /* wrap window / frame position pointers */
+    if (window_posn == lzx->window_size)     window_posn = 0;
+    if (lzx->frame_posn == lzx->window_size) lzx->frame_posn = 0;
+
+  } /* while (lzx->frame < end_frame) */
+
+  if (out_bytes) {
+    D(("bytes left to output"))
+    return lzx->error = MSPACK_ERR_DECRUNCH;
+  }
+
+  /* store local state */
+  STORE_BITS;
+  lzx->window_posn = window_posn;
+  lzx->R0 = R0;
+  lzx->R1 = R1;
+  lzx->R2 = R2;
+
+  return MSPACK_ERR_OK;
+}
+
+void lzxd_free(struct lzxd_stream *lzx) {
+  struct mspack_system *sys;
+  if (lzx) {
+    sys = lzx->sys;
+    sys->free(lzx->inbuf);
+    sys->free(lzx->window);
+    sys->free(lzx);
+  }
+}
diff --git a/utils/rbutilqt/mspack/mspack.h b/utils/rbutilqt/mspack/mspack.h
new file mode 100644
index 0000000000..3e99624463
--- /dev/null
+++ b/utils/rbutilqt/mspack/mspack.h
@@ -0,0 +1,2385 @@
+/* libmspack -- a library for working with Microsoft compression formats.
+ * (C) 2003-2019 Stuart Caie <kyzer@cabextract.org.uk>
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/** \mainpage
+ *
+ * \section intro Introduction
+ *
+ * libmspack is a library which provides compressors and decompressors,
+ * archivers and dearchivers for Microsoft compression formats.
+ *
+ * \section formats Formats supported
+ *
+ * The following file formats are supported:
+ * - SZDD files, which use LZSS compression
+ * - KWAJ files, which use LZSS, LZSS+Huffman or deflate compression
+ * - .HLP (MS Help) files, which use LZSS compression
+ * - .CAB (MS Cabinet) files, which use deflate, LZX or Quantum compression
+ * - .CHM (HTML Help) files, which use LZX compression
+ * - .LIT (MS EBook) files, which use LZX compression and DES encryption
+ * - .LZX (Exchange Offline Addressbook) files, which use LZX compression
+ *
+ * To determine the capabilities of the library, and the binary
+ * compatibility version of any particular compressor or decompressor, use
+ * the mspack_version() function. The UNIX library interface version is
+ * defined as the highest-versioned library component.
+ *
+ * \section starting Getting started
+ *
+ * The macro MSPACK_SYS_SELFTEST() should be used to ensure the library can
+ * be used. In particular, it checks if the caller is using 32-bit file I/O
+ * when the library is compiled for 64-bit file I/O and vice versa.
+ *
+ * If compiled normally, the library includes basic file I/O and memory
+ * management functionality using the standard C library. This can be
+ * customised and replaced entirely by creating a mspack_system structure.
+ *
+ * A compressor or decompressor for the required format must be
+ * instantiated before it can be used. Each construction function takes
+ * one parameter, which is either a pointer to a custom mspack_system
+ * structure, or NULL to use the default. The instantiation returned, if
+ * not NULL, contains function pointers (methods) to work with the given
+ * file format.
+ * 
+ * For compression:
+ * - mspack_create_cab_compressor() creates a mscab_compressor
+ * - mspack_create_chm_compressor() creates a mschm_compressor
+ * - mspack_create_lit_compressor() creates a mslit_compressor
+ * - mspack_create_hlp_compressor() creates a mshlp_compressor
+ * - mspack_create_szdd_compressor() creates a msszdd_compressor
+ * - mspack_create_kwaj_compressor() creates a mskwaj_compressor
+ * - mspack_create_oab_compressor() creates a msoab_compressor
+ *
+ * For decompression:
+ * - mspack_create_cab_decompressor() creates a mscab_decompressor
+ * - mspack_create_chm_decompressor() creates a mschm_decompressor
+ * - mspack_create_lit_decompressor() creates a mslit_decompressor
+ * - mspack_create_hlp_decompressor() creates a mshlp_decompressor
+ * - mspack_create_szdd_decompressor() creates a msszdd_decompressor
+ * - mspack_create_kwaj_decompressor() creates a mskwaj_decompressor
+ * - mspack_create_oab_decompressor() creates a msoab_decompressor
+ *
+ * Once finished working with a format, each kind of
+ * compressor/decompressor has its own specific destructor:
+ * - mspack_destroy_cab_compressor()
+ * - mspack_destroy_cab_decompressor()
+ * - mspack_destroy_chm_compressor()
+ * - mspack_destroy_chm_decompressor()
+ * - mspack_destroy_lit_compressor()
+ * - mspack_destroy_lit_decompressor()
+ * - mspack_destroy_hlp_compressor()
+ * - mspack_destroy_hlp_decompressor()
+ * - mspack_destroy_szdd_compressor()
+ * - mspack_destroy_szdd_decompressor()
+ * - mspack_destroy_kwaj_compressor()
+ * - mspack_destroy_kwaj_decompressor()
+ * - mspack_destroy_oab_compressor()
+ * - mspack_destroy_oab_decompressor()
+ *
+ * Destroying a compressor or decompressor does not destroy any objects,
+ * structures or handles that have been created using that compressor or
+ * decompressor. Ensure that everything created or opened is destroyed or
+ * closed before compressor/decompressor is itself destroyed.
+ *
+ * \section errors Error codes
+ *
+ * All compressors and decompressors use the same set of error codes. Most
+ * methods return an error code directly. For methods which do not
+ * return error codes directly, the error code can be obtained with the
+ * last_error() method.
+ *
+ * - #MSPACK_ERR_OK is used to indicate success. This error code is defined
+ *   as zero, all other code are non-zero.
+ * - #MSPACK_ERR_ARGS indicates that a method was called with inappropriate
+ *   arguments.
+ * - #MSPACK_ERR_OPEN indicates that mspack_system::open() failed.
+ * - #MSPACK_ERR_READ indicates that mspack_system::read() failed.
+ * - #MSPACK_ERR_WRITE indicates that mspack_system::write() failed.
+ * - #MSPACK_ERR_SEEK indicates that mspack_system::seek() failed.
+ * - #MSPACK_ERR_NOMEMORY indicates that mspack_system::alloc() failed.
+ * - #MSPACK_ERR_SIGNATURE indicates that the file being read does not
+ *   have the correct "signature". It is probably not a valid file for
+ *   whatever format is being read.
+ * - #MSPACK_ERR_DATAFORMAT indicates that the file being used or read
+ *   is corrupt.
+ * - #MSPACK_ERR_CHECKSUM indicates that a data checksum has failed.
+ * - #MSPACK_ERR_CRUNCH indicates an error occured during compression.
+ * - #MSPACK_ERR_DECRUNCH indicates an error occured during decompression.
+ *
+ * \section threading Multi-threading
+ *
+ * libmspack methods are reentrant and multithreading-safe when each
+ * thread has its own compressor or decompressor.
+
+ * You should not call multiple methods simultaneously on a single
+ * compressor or decompressor instance.
+ *
+ * If this may happen, you can either use one compressor or
+ * decompressor per thread, or you can use your preferred lock,
+ * semaphore or mutex library to ensure no more than one method on a
+ * compressor/decompressor is called simultaneously. libmspack will
+ * not do this locking for you.
+ *
+ * Example of incorrect behaviour:
+ * - thread 1 calls mspack_create_cab_decompressor()
+ * - thread 1 calls open()
+ * - thread 1 calls extract() for one file
+ * - thread 2 simultaneously calls extract() for another file
+ *
+ * Correct behaviour:
+ * - thread 1 calls mspack_create_cab_decompressor()
+ * - thread 2 calls mspack_create_cab_decompressor()
+ * - thread 1 calls its own open() / extract()
+ * - thread 2 simultaneously calls its own open() / extract()
+ *
+ * Also correct behaviour:
+ * - thread 1 calls mspack_create_cab_decompressor()
+ * - thread 1 locks a mutex for with the decompressor before
+ *   calling any methods on it, and unlocks the mutex after each
+ *   method returns.
+ * - thread 1 can share the results of open() with thread 2, and both
+ *   can call extract(), provided they both guard against simultaneous
+ *   use of extract(), and any other methods, with the mutex
+ */
+
+#ifndef LIB_MSPACK_H
+#define LIB_MSPACK_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/types.h>
+#include <stdlib.h>
+
+/**
+ * System self-test function, to ensure both library and calling program
+ * can use one another.
+ *
+ * A result of MSPACK_ERR_OK means the library and caller are
+ * compatible. Any other result indicates that the library and caller are
+ * not compatible and should not be used. In particular, a value of
+ * MSPACK_ERR_SEEK means the library and caller use different off_t
+ * datatypes.
+ *
+ * It should be used like so:
+ *
+ * @code
+ * int selftest_result;
+ * MSPACK_SYS_SELFTEST(selftest_result);
+ * if (selftest_result != MSPACK_ERR_OK) {
+ *   fprintf(stderr, "incompatible with this build of libmspack\n");
+ *   exit(0);
+ * }
+ * @endcode
+ *
+ * @param  result   an int variable to store the result of the self-test
+ */
+#define MSPACK_SYS_SELFTEST(result)  do { \
+  (result) = mspack_sys_selftest_internal(sizeof(off_t)); \
+} while (0)
+
+/** Part of the MSPACK_SYS_SELFTEST() macro, must not be used directly. */
+extern int mspack_sys_selftest_internal(int);
+
+/**
+ * Enquire about the binary compatibility version of a specific interface in
+ * the library. Currently, the following interfaces are defined:
+ *
+ * - #MSPACK_VER_LIBRARY: the overall library
+ * - #MSPACK_VER_SYSTEM: the mspack_system interface
+ * - #MSPACK_VER_MSCABD: the mscab_decompressor interface
+ * - #MSPACK_VER_MSCABC: the mscab_compressor interface
+ * - #MSPACK_VER_MSCHMD: the mschm_decompressor interface
+ * - #MSPACK_VER_MSCHMC: the mschm_compressor interface
+ * - #MSPACK_VER_MSLITD: the mslit_decompressor interface
+ * - #MSPACK_VER_MSLITC: the mslit_compressor interface
+ * - #MSPACK_VER_MSHLPD: the mshlp_decompressor interface
+ * - #MSPACK_VER_MSHLPC: the mshlp_compressor interface
+ * - #MSPACK_VER_MSSZDDD: the msszdd_decompressor interface
+ * - #MSPACK_VER_MSSZDDC: the msszdd_compressor interface
+ * - #MSPACK_VER_MSKWAJD: the mskwaj_decompressor interface
+ * - #MSPACK_VER_MSKWAJC: the mskwaj_compressor interface
+ * - #MSPACK_VER_MSOABD: the msoab_decompressor interface
+ * - #MSPACK_VER_MSOABC: the msoab_compressor interface
+ *
+ * The result of the function should be interpreted as follows:
+ * - -1: this interface is completely unknown to the library
+ * - 0: this interface is known, but non-functioning
+ * - 1: this interface has all basic functionality
+ * - 2, 3, ...: this interface has additional functionality, clearly marked
+ *   in the documentation as "version 2", "version 3" and so on.
+ *
+ * @param entity the interface to request current version of
+ * @return the version of the requested interface
+ */
+extern int mspack_version(int entity);
+
+/** Pass to mspack_version() to get the overall library version */
+#define MSPACK_VER_LIBRARY   (0)
+/** Pass to mspack_version() to get the mspack_system version */
+#define MSPACK_VER_SYSTEM    (1)
+/** Pass to mspack_version() to get the mscab_decompressor version */
+#define MSPACK_VER_MSCABD    (2)
+/** Pass to mspack_version() to get the mscab_compressor version */
+#define MSPACK_VER_MSCABC    (3)
+/** Pass to mspack_version() to get the mschm_decompressor version */
+#define MSPACK_VER_MSCHMD    (4)
+/** Pass to mspack_version() to get the mschm_compressor version */
+#define MSPACK_VER_MSCHMC    (5)
+/** Pass to mspack_version() to get the mslit_decompressor version */
+#define MSPACK_VER_MSLITD    (6)
+/** Pass to mspack_version() to get the mslit_compressor version */
+#define MSPACK_VER_MSLITC    (7)
+/** Pass to mspack_version() to get the mshlp_decompressor version */
+#define MSPACK_VER_MSHLPD    (8)
+/** Pass to mspack_version() to get the mshlp_compressor version */
+#define MSPACK_VER_MSHLPC    (9)
+/** Pass to mspack_version() to get the msszdd_decompressor version */
+#define MSPACK_VER_MSSZDDD   (10)
+/** Pass to mspack_version() to get the msszdd_compressor version */
+#define MSPACK_VER_MSSZDDC   (11)
+/** Pass to mspack_version() to get the mskwaj_decompressor version */
+#define MSPACK_VER_MSKWAJD   (12)
+/** Pass to mspack_version() to get the mskwaj_compressor version */
+#define MSPACK_VER_MSKWAJC   (13)
+/** Pass to mspack_version() to get the msoab_decompressor version */
+#define MSPACK_VER_MSOABD    (14)
+/** Pass to mspack_version() to get the msoab_compressor version */
+#define MSPACK_VER_MSOABC    (15)
+
+/* --- file I/O abstraction ------------------------------------------------ */
+
+/**
+ * A structure which abstracts file I/O and memory management.
+ *
+ * The library always uses the mspack_system structure for interaction
+ * with the file system and to allocate, free and copy all memory. It also
+ * uses it to send literal messages to the library user.
+ *
+ * When the library is compiled normally, passing NULL to a compressor or
+ * decompressor constructor will result in a default mspack_system being
+ * used, where all methods are implemented with the standard C library.
+ * However, all constructors support being given a custom created
+ * mspack_system structure, with the library user's own methods. This
+ * allows for more abstract interaction, such as reading and writing files
+ * directly to memory, or from a network socket or pipe.
+ *
+ * Implementors of an mspack_system structure should read all
+ * documentation entries for every structure member, and write methods
+ * which conform to those standards.
+ */
+struct mspack_system {
+  /**
+   * Opens a file for reading, writing, appending or updating.
+   *
+   * @param self     a self-referential pointer to the mspack_system
+   *                 structure whose open() method is being called. If
+   *                 this pointer is required by close(), read(), write(),
+   *                 seek() or tell(), it should be stored in the result
+   *                 structure at this time.
+   * @param filename the file to be opened. It is passed directly from the
+   *                 library caller without being modified, so it is up to
+   *                 the caller what this parameter actually represents.
+   * @param mode     one of #MSPACK_SYS_OPEN_READ (open an existing file
+   *                 for reading), #MSPACK_SYS_OPEN_WRITE (open a new file
+   *                 for writing), #MSPACK_SYS_OPEN_UPDATE (open an existing
+   *                 file for reading/writing from the start of the file) or
+   *                 #MSPACK_SYS_OPEN_APPEND (open an existing file for
+   *                 reading/writing from the end of the file)
+   * @return a pointer to a mspack_file structure. This structure officially
+   *         contains no members, its true contents are up to the
+   *         mspack_system implementor. It should contain whatever is needed
+   *         for other mspack_system methods to operate. Returning the NULL
+   *         pointer indicates an error condition.
+   * @see close(), read(), write(), seek(), tell(), message()
+   */
+  struct mspack_file * (*open)(struct mspack_system *self,
+                               const char *filename,
+                               int mode);
+
+  /**
+   * Closes a previously opened file. If any memory was allocated for this
+   * particular file handle, it should be freed at this time.
+   * 
+   * @param file the file to close
+   * @see open()
+   */
+  void (*close)(struct mspack_file *file);
+
+  /**
+   * Reads a given number of bytes from an open file.
+   *
+   * @param file    the file to read from
+   * @param buffer  the location where the read bytes should be stored
+   * @param bytes   the number of bytes to read from the file.
+   * @return the number of bytes successfully read (this can be less than
+   *         the number requested), zero to mark the end of file, or less
+   *         than zero to indicate an error. The library does not "retry"
+   *         reads and assumes short reads are due to EOF, so you should
+   *         avoid returning short reads because of transient errors.
+   * @see open(), write()
+   */
+  int (*read)(struct mspack_file *file,
+              void *buffer,
+              int bytes);
+
+  /**
+   * Writes a given number of bytes to an open file.
+   *
+   * @param file    the file to write to
+   * @param buffer  the location where the written bytes should be read from
+   * @param bytes   the number of bytes to write to the file.
+   * @return the number of bytes successfully written, this can be less
+   *         than the number requested. Zero or less can indicate an error
+   *         where no bytes at all could be written. All cases where less
+   *         bytes were written than requested are considered by the library
+   *         to be an error.
+   * @see open(), read()
+   */
+  int (*write)(struct mspack_file *file,
+               void *buffer,
+               int bytes);
+
+  /**
+   * Seeks to a specific file offset within an open file.
+   *
+   * Sometimes the library needs to know the length of a file. It does
+   * this by seeking to the end of the file with seek(file, 0,
+   * MSPACK_SYS_SEEK_END), then calling tell(). Implementations may want
+   * to make a special case for this.
+   *
+   * Due to the potentially varying 32/64 bit datatype off_t on some
+   * architectures, the #MSPACK_SYS_SELFTEST macro MUST be used before
+   * using the library. If not, the error caused by the library passing an
+   * inappropriate stackframe to seek() is subtle and hard to trace.
+   *
+   * @param file   the file to be seeked
+   * @param offset an offset to seek, measured in bytes
+   * @param mode   one of #MSPACK_SYS_SEEK_START (the offset should be
+   *               measured from the start of the file), #MSPACK_SYS_SEEK_CUR
+   *               (the offset should be measured from the current file offset)
+   *               or #MSPACK_SYS_SEEK_END (the offset should be measured from
+   *               the end of the file)
+   * @return zero for success, non-zero for an error
+   * @see open(), tell()
+   */
+  int (*seek)(struct mspack_file *file,
+              off_t offset,
+              int mode);
+
+  /**
+   * Returns the current file position (in bytes) of the given file.
+   *
+   * @param file the file whose file position is wanted
+   * @return the current file position of the file
+   * @see open(), seek()
+   */
+  off_t (*tell)(struct mspack_file *file);
+  
+  /**
+   * Used to send messages from the library to the user.
+   *
+   * Occasionally, the library generates warnings or other messages in
+   * plain english to inform the human user. These are informational only
+   * and can be ignored if not wanted.
+   *
+   * @param file   may be a file handle returned from open() if this message
+   *               pertains to a specific open file, or NULL if not related to
+   *               a specific file.
+   * @param format a printf() style format string. It does NOT include a
+   *               trailing newline.
+   * @see open()
+   */
+  void (*message)(struct mspack_file *file,
+                  const char *format,
+                  ...);
+
+  /**
+   * Allocates memory.
+   *
+   * @param self     a self-referential pointer to the mspack_system
+   *                 structure whose alloc() method is being called.
+   * @param bytes    the number of bytes to allocate
+   * @result a pointer to the requested number of bytes, or NULL if
+   *         not enough memory is available
+   * @see free()
+   */
+  void * (*alloc)(struct mspack_system *self,
+                  size_t bytes);
+  
+  /**
+   * Frees memory.
+   * 
+   * @param ptr the memory to be freed. NULL is accepted and ignored.
+   * @see alloc()
+   */
+  void (*free)(void *ptr);
+
+  /**
+   * Copies from one region of memory to another.
+   * 
+   * The regions of memory are guaranteed not to overlap, are usually less
+   * than 256 bytes, and may not be aligned. Please note that the source
+   * parameter comes before the destination parameter, unlike the standard
+   * C function memcpy().
+   *
+   * @param src   the region of memory to copy from
+   * @param dest  the region of memory to copy to
+   * @param bytes the size of the memory region, in bytes
+   */
+  void (*copy)(void *src,
+               void *dest,
+               size_t bytes);
+
+  /**
+   * A null pointer to mark the end of mspack_system. It must equal NULL.
+   *
+   * Should the mspack_system structure extend in the future, this NULL
+   * will be seen, rather than have an invalid method pointer called.
+   */
+  void *null_ptr;
+};
+
+/** mspack_system::open() mode: open existing file for reading. */
+#define MSPACK_SYS_OPEN_READ   (0)
+/** mspack_system::open() mode: open new file for writing */
+#define MSPACK_SYS_OPEN_WRITE  (1)
+/** mspack_system::open() mode: open existing file for writing */
+#define MSPACK_SYS_OPEN_UPDATE (2)
+/** mspack_system::open() mode: open existing file for writing */
+#define MSPACK_SYS_OPEN_APPEND (3)
+
+/** mspack_system::seek() mode: seek relative to start of file */
+#define MSPACK_SYS_SEEK_START  (0)
+/** mspack_system::seek() mode: seek relative to current offset */
+#define MSPACK_SYS_SEEK_CUR    (1)
+/** mspack_system::seek() mode: seek relative to end of file */
+#define MSPACK_SYS_SEEK_END    (2)
+
+/** 
+ * A structure which represents an open file handle. The contents of this
+ * structure are determined by the implementation of the
+ * mspack_system::open() method.
+ */
+struct mspack_file {
+  int dummy;
+};
+
+/* --- error codes --------------------------------------------------------- */
+
+/** Error code: no error */
+#define MSPACK_ERR_OK          (0)
+/** Error code: bad arguments to method */
+#define MSPACK_ERR_ARGS        (1)
+/** Error code: error opening file */
+#define MSPACK_ERR_OPEN        (2)
+/** Error code: error reading file */
+#define MSPACK_ERR_READ        (3)
+/** Error code: error writing file */
+#define MSPACK_ERR_WRITE       (4)
+/** Error code: seek error */
+#define MSPACK_ERR_SEEK        (5)
+/** Error code: out of memory */
+#define MSPACK_ERR_NOMEMORY    (6)
+/** Error code: bad "magic id" in file */
+#define MSPACK_ERR_SIGNATURE   (7)
+/** Error code: bad or corrupt file format */
+#define MSPACK_ERR_DATAFORMAT  (8)
+/** Error code: bad checksum or CRC */
+#define MSPACK_ERR_CHECKSUM    (9)
+/** Error code: error during compression */
+#define MSPACK_ERR_CRUNCH      (10)
+/** Error code: error during decompression */
+#define MSPACK_ERR_DECRUNCH    (11)
+
+/* --- functions available in library -------------------------------------- */
+
+/** Creates a new CAB compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mscab_compressor or NULL
+ */
+extern struct mscab_compressor *
+  mspack_create_cab_compressor(struct mspack_system *sys);
+
+/** Creates a new CAB decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mscab_decompressor or NULL
+ */
+extern struct mscab_decompressor *
+  mspack_create_cab_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing CAB compressor.
+ * @param self the #mscab_compressor to destroy
+ */
+extern void mspack_destroy_cab_compressor(struct mscab_compressor *self);
+
+/** Destroys an existing CAB decompressor.
+ * @param self the #mscab_decompressor to destroy
+ */
+extern void mspack_destroy_cab_decompressor(struct mscab_decompressor *self);
+
+
+/** Creates a new CHM compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mschm_compressor or NULL
+ */
+extern struct mschm_compressor *
+  mspack_create_chm_compressor(struct mspack_system *sys);
+
+/** Creates a new CHM decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mschm_decompressor or NULL
+ */
+extern struct mschm_decompressor *
+  mspack_create_chm_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing CHM compressor.
+ * @param self the #mschm_compressor to destroy
+ */
+extern void mspack_destroy_chm_compressor(struct mschm_compressor *self);
+
+/** Destroys an existing CHM decompressor.
+ * @param self the #mschm_decompressor to destroy
+ */
+extern void mspack_destroy_chm_decompressor(struct mschm_decompressor *self);
+
+
+/** Creates a new LIT compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mslit_compressor or NULL
+ */
+extern struct mslit_compressor *
+  mspack_create_lit_compressor(struct mspack_system *sys);
+
+/** Creates a new LIT decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mslit_decompressor or NULL
+ */
+extern struct mslit_decompressor *
+  mspack_create_lit_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing LIT compressor.
+ * @param self the #mslit_compressor to destroy
+ */
+extern void mspack_destroy_lit_compressor(struct mslit_compressor *self);
+
+/** Destroys an existing LIT decompressor.
+ * @param self the #mslit_decompressor to destroy
+ */
+extern void mspack_destroy_lit_decompressor(struct mslit_decompressor *self);
+
+
+/** Creates a new HLP compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mshlp_compressor or NULL
+ */
+extern struct mshlp_compressor *
+  mspack_create_hlp_compressor(struct mspack_system *sys);
+
+/** Creates a new HLP decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mshlp_decompressor or NULL
+ */
+extern struct mshlp_decompressor *
+  mspack_create_hlp_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing hlp compressor.
+ * @param self the #mshlp_compressor to destroy
+ */
+extern void mspack_destroy_hlp_compressor(struct mshlp_compressor *self);
+
+/** Destroys an existing hlp decompressor.
+ * @param self the #mshlp_decompressor to destroy
+ */
+extern void mspack_destroy_hlp_decompressor(struct mshlp_decompressor *self);
+
+
+/** Creates a new SZDD compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #msszdd_compressor or NULL
+ */
+extern struct msszdd_compressor *
+  mspack_create_szdd_compressor(struct mspack_system *sys);
+
+/** Creates a new SZDD decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #msszdd_decompressor or NULL
+ */
+extern struct msszdd_decompressor *
+  mspack_create_szdd_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing SZDD compressor.
+ * @param self the #msszdd_compressor to destroy
+ */
+extern void mspack_destroy_szdd_compressor(struct msszdd_compressor *self);
+
+/** Destroys an existing SZDD decompressor.
+ * @param self the #msszdd_decompressor to destroy
+ */
+extern void mspack_destroy_szdd_decompressor(struct msszdd_decompressor *self);
+
+
+/** Creates a new KWAJ compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mskwaj_compressor or NULL
+ */
+extern struct mskwaj_compressor *
+  mspack_create_kwaj_compressor(struct mspack_system *sys);
+
+/** Creates a new KWAJ decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #mskwaj_decompressor or NULL
+ */
+extern struct mskwaj_decompressor *
+  mspack_create_kwaj_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing KWAJ compressor.
+ * @param self the #mskwaj_compressor to destroy
+ */
+extern void mspack_destroy_kwaj_compressor(struct mskwaj_compressor *self);
+
+/** Destroys an existing KWAJ decompressor.
+ * @param self the #mskwaj_decompressor to destroy
+ */
+extern void mspack_destroy_kwaj_decompressor(struct mskwaj_decompressor *self);
+
+
+/** Creates a new OAB compressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #msoab_compressor or NULL
+ */
+extern struct msoab_compressor *
+  mspack_create_oab_compressor(struct mspack_system *sys);
+
+/** Creates a new OAB decompressor.
+ * @param sys a custom mspack_system structure, or NULL to use the default
+ * @return a #msoab_decompressor or NULL
+ */
+extern struct msoab_decompressor *
+  mspack_create_oab_decompressor(struct mspack_system *sys);
+
+/** Destroys an existing OAB compressor.
+ * @param self the #msoab_compressor to destroy
+ */
+extern void mspack_destroy_oab_compressor(struct msoab_compressor *self);
+
+/** Destroys an existing OAB decompressor.
+ * @param self the #msoab_decompressor to destroy
+ */
+extern void mspack_destroy_oab_decompressor(struct msoab_decompressor *self);
+
+
+/* --- support for .CAB (MS Cabinet) file format --------------------------- */
+
+/**
+ * A structure which represents a single cabinet file.
+ *
+ * All fields are READ ONLY.
+ *
+ * If this cabinet is part of a merged cabinet set, the #files and #folders
+ * fields are common to all cabinets in the set, and will be identical.
+ *
+ * @see mscab_decompressor::open(), mscab_decompressor::close(),
+ *      mscab_decompressor::search()
+ */
+struct mscabd_cabinet {
+  /**
+   * The next cabinet in a chained list, if this cabinet was opened with
+   * mscab_decompressor::search(). May be NULL to mark the end of the
+   * list.
+   */
+  struct mscabd_cabinet *next;
+
+  /**
+   * The filename of the cabinet. More correctly, the filename of the
+   * physical file that the cabinet resides in. This is given by the
+   * library user and may be in any format.
+   */
+  const char *filename;
+  
+  /** The file offset of cabinet within the physical file it resides in. */
+  off_t base_offset;
+
+  /** The length of the cabinet file in bytes. */
+  unsigned int length;
+
+  /** The previous cabinet in a cabinet set, or NULL. */
+  struct mscabd_cabinet *prevcab;
+
+  /** The next cabinet in a cabinet set, or NULL. */
+  struct mscabd_cabinet *nextcab;
+
+  /** The filename of the previous cabinet in a cabinet set, or NULL. */
+  char *prevname;
+
+  /** The filename of the next cabinet in a cabinet set, or NULL. */
+  char *nextname;
+
+  /** The name of the disk containing the previous cabinet in a cabinet
+   * set, or NULL.
+   */
+  char *previnfo;
+
+  /** The name of the disk containing the next cabinet in a cabinet set,
+   * or NULL.
+   */
+  char *nextinfo;
+
+  /** A list of all files in the cabinet or cabinet set. */
+  struct mscabd_file *files;
+
+  /** A list of all folders in the cabinet or cabinet set. */
+  struct mscabd_folder *folders;
+
+  /** 
+   * The set ID of the cabinet. All cabinets in the same set should have
+   * the same set ID.
+   */
+  unsigned short set_id;
+
+  /**
+   * The index number of the cabinet within the set. Numbering should
+   * start from 0 for the first cabinet in the set, and increment by 1 for
+   * each following cabinet.
+   */
+  unsigned short set_index;
+
+  /**
+   * The number of bytes reserved in the header area of the cabinet.
+   *
+   * If this is non-zero and flags has MSCAB_HDR_RESV set, this data can
+   * be read by the calling application. It is of the given length,
+   * located at offset (base_offset + MSCAB_HDR_RESV_OFFSET) in the
+   * cabinet file.
+   *
+   * @see flags
+   */
+  unsigned short header_resv;
+
+  /**
+   * Header flags.
+   *
+   * - MSCAB_HDR_PREVCAB indicates the cabinet is part of a cabinet set, and
+   *                     has a predecessor cabinet.
+   * - MSCAB_HDR_NEXTCAB indicates the cabinet is part of a cabinet set, and
+   *                     has a successor cabinet.
+   * - MSCAB_HDR_RESV indicates the cabinet has reserved header space.
+   *
+   * @see prevname, previnfo, nextname, nextinfo, header_resv
+   */
+  int flags;
+};
+
+/** Offset from start of cabinet to the reserved header data (if present). */
+#define MSCAB_HDR_RESV_OFFSET (0x28)
+
+/** Cabinet header flag: cabinet has a predecessor */
+#define MSCAB_HDR_PREVCAB (0x01)
+/** Cabinet header flag: cabinet has a successor */
+#define MSCAB_HDR_NEXTCAB (0x02)
+/** Cabinet header flag: cabinet has reserved header space */
+#define MSCAB_HDR_RESV    (0x04)
+
+/**
+ * A structure which represents a single folder in a cabinet or cabinet set.
+ *
+ * All fields are READ ONLY.
+ *
+ * A folder is a single compressed stream of data. When uncompressed, it
+ * holds the data of one or more files. A folder may be split across more
+ * than one cabinet.
+ */
+struct mscabd_folder {
+  /**
+   * A pointer to the next folder in this cabinet or cabinet set, or NULL
+   * if this is the final folder.
+   */
+  struct mscabd_folder *next;
+
+  /** 
+   * The compression format used by this folder.
+   *
+   * The macro MSCABD_COMP_METHOD() should be used on this field to get
+   * the algorithm used. The macro MSCABD_COMP_LEVEL() should be used to get
+   * the "compression level".
+   *
+   * @see MSCABD_COMP_METHOD(), MSCABD_COMP_LEVEL()
+   */
+  int comp_type;
+
+  /**
+   * The total number of data blocks used by this folder. This includes
+   * data blocks present in other files, if this folder spans more than
+   * one cabinet.
+   */
+  unsigned int num_blocks;
+};
+
+/**
+ * Returns the compression method used by a folder.
+ *
+ * @param comp_type a mscabd_folder::comp_type value
+ * @return one of #MSCAB_COMP_NONE, #MSCAB_COMP_MSZIP, #MSCAB_COMP_QUANTUM
+ *         or #MSCAB_COMP_LZX
+ */
+#define MSCABD_COMP_METHOD(comp_type) ((comp_type) & 0x0F)
+/**
+ * Returns the compression level used by a folder.
+ *
+ * @param comp_type a mscabd_folder::comp_type value
+ * @return the compression level. This is only defined by LZX and Quantum
+ *         compression
+ */
+#define MSCABD_COMP_LEVEL(comp_type) (((comp_type) >> 8) & 0x1F)
+
+/** Compression mode: no compression. */
+#define MSCAB_COMP_NONE       (0)
+/** Compression mode: MSZIP (deflate) compression. */
+#define MSCAB_COMP_MSZIP      (1)
+/** Compression mode: Quantum compression */
+#define MSCAB_COMP_QUANTUM    (2)
+/** Compression mode: LZX compression */
+#define MSCAB_COMP_LZX        (3)
+
+/**
+ * A structure which represents a single file in a cabinet or cabinet set.
+ *
+ * All fields are READ ONLY.
+ */
+struct mscabd_file {
+  /**
+   * The next file in the cabinet or cabinet set, or NULL if this is the
+   * final file.
+   */
+  struct mscabd_file *next;
+
+  /**
+   * The filename of the file.
+   *
+   * A null terminated string of up to 255 bytes in length, it may be in
+   * either ISO-8859-1 or UTF8 format, depending on the file attributes.
+   *
+   * @see attribs
+   */
+  char *filename;
+
+  /** The uncompressed length of the file, in bytes. */
+  unsigned int length;
+
+  /**
+   * File attributes.
+   *
+   * The following attributes are defined:
+   * - #MSCAB_ATTRIB_RDONLY indicates the file is write protected.
+   * - #MSCAB_ATTRIB_HIDDEN indicates the file is hidden.
+   * - #MSCAB_ATTRIB_SYSTEM indicates the file is a operating system file.
+   * - #MSCAB_ATTRIB_ARCH indicates the file is "archived".
+   * - #MSCAB_ATTRIB_EXEC indicates the file is an executable program.
+   * - #MSCAB_ATTRIB_UTF_NAME indicates the filename is in UTF8 format rather
+   *   than ISO-8859-1.
+   */
+  int attribs;
+
+  /** File's last modified time, hour field. */
+  char time_h;
+  /** File's last modified time, minute field. */
+  char time_m;
+  /** File's last modified time, second field. */
+  char time_s;
+
+  /** File's last modified date, day field. */
+  char date_d;
+  /** File's last modified date, month field. */
+  char date_m;
+  /** File's last modified date, year field. */
+  int date_y;
+
+  /** A pointer to the folder that contains this file. */
+  struct mscabd_folder *folder;
+
+  /** The uncompressed offset of this file in its folder. */
+  unsigned int offset;
+};
+
+/** mscabd_file::attribs attribute: file is read-only. */
+#define MSCAB_ATTRIB_RDONLY   (0x01)
+/** mscabd_file::attribs attribute: file is hidden. */
+#define MSCAB_ATTRIB_HIDDEN   (0x02)
+/** mscabd_file::attribs attribute: file is an operating system file. */
+#define MSCAB_ATTRIB_SYSTEM   (0x04)
+/** mscabd_file::attribs attribute: file is "archived". */
+#define MSCAB_ATTRIB_ARCH     (0x20)
+/** mscabd_file::attribs attribute: file is an executable program. */
+#define MSCAB_ATTRIB_EXEC     (0x40)
+/** mscabd_file::attribs attribute: filename is UTF8, not ISO-8859-1. */
+#define MSCAB_ATTRIB_UTF_NAME (0x80)
+
+/** mscab_decompressor::set_param() parameter: search buffer size. */
+#define MSCABD_PARAM_SEARCHBUF (0)
+/** mscab_decompressor::set_param() parameter: repair MS-ZIP streams? */
+#define MSCABD_PARAM_FIXMSZIP  (1)
+/** mscab_decompressor::set_param() parameter: size of decompression buffer */
+#define MSCABD_PARAM_DECOMPBUF (2)
+/** mscab_decompressor::set_param() parameter: salvage data from bad cabinets?
+ * If enabled, open() will skip file with bad folder indices or filenames
+ * rather than reject the whole cabinet, and extract() will limit rather than
+ * reject files with invalid offsets and lengths, and bad data block checksums
+ * will be ignored. Available only in CAB decoder version 2 and above.
+ */
+#define MSCABD_PARAM_SALVAGE   (3)
+
+/** TODO */
+struct mscab_compressor {
+  int dummy; 
+};
+
+/**
+ * A decompressor for .CAB (Microsoft Cabinet) files
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_cab_decompressor(), mspack_destroy_cab_decompressor()
+ */
+struct mscab_decompressor {
+  /**
+   * Opens a cabinet file and reads its contents.
+   *
+   * If the file opened is a valid cabinet file, all headers will be read
+   * and a mscabd_cabinet structure will be returned, with a full list of
+   * folders and files.
+   *
+   * In the case of an error occuring, NULL is returned and the error code
+   * is available from last_error().
+   *
+   * The filename pointer should be considered "in use" until close() is
+   * called on the cabinet.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  filename the filename of the cabinet file. This is passed
+   *                  directly to mspack_system::open().
+   * @return a pointer to a mscabd_cabinet structure, or NULL on failure
+   * @see close(), search(), last_error()
+   */
+  struct mscabd_cabinet * (*open) (struct mscab_decompressor *self,
+                                   const char *filename);
+
+  /**
+   * Closes a previously opened cabinet or cabinet set.
+   *
+   * This closes a cabinet, all cabinets associated with it via the
+   * mscabd_cabinet::next, mscabd_cabinet::prevcab and
+   * mscabd_cabinet::nextcab pointers, and all folders and files. All
+   * memory used by these entities is freed.
+   *
+   * The cabinet pointer is now invalid and cannot be used again. All
+   * mscabd_folder and mscabd_file pointers from that cabinet or cabinet
+   * set are also now invalid, and cannot be used again.
+   *
+   * If the cabinet pointer given was created using search(), it MUST be
+   * the cabinet pointer returned by search() and not one of the later
+   * cabinet pointers further along the mscabd_cabinet::next chain.
+
+   * If extra cabinets have been added using append() or prepend(), these
+   * will all be freed, even if the cabinet pointer given is not the first
+   * cabinet in the set. Do NOT close() more than one cabinet in the set.
+   *
+   * The mscabd_cabinet::filename is not freed by the library, as it is
+   * not allocated by the library. The caller should free this itself if
+   * necessary, before it is lost forever.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  cab      the cabinet to close
+   * @see open(), search(), append(), prepend()
+   */
+  void (*close)(struct mscab_decompressor *self,
+                struct mscabd_cabinet *cab);
+
+  /**
+   * Searches a regular file for embedded cabinets.
+   *
+   * This opens a normal file with the given filename and will search the
+   * entire file for embedded cabinet files
+   *
+   * If any cabinets are found, the equivalent of open() is called on each
+   * potential cabinet file at the offset it was found. All successfully
+   * open()ed cabinets are kept in a list.
+   *
+   * The first cabinet found will be returned directly as the result of
+   * this method. Any further cabinets found will be chained in a list
+   * using the mscabd_cabinet::next field.
+   *
+   * In the case of an error occuring anywhere other than the simulated
+   * open(), NULL is returned and the error code is available from
+   * last_error().
+   *
+   * If no error occurs, but no cabinets can be found in the file, NULL is
+   * returned and last_error() returns MSPACK_ERR_OK.
+   *
+   * The filename pointer should be considered in use until close() is
+   * called on the cabinet.
+   *
+   * close() should only be called on the result of search(), not on any
+   * subsequent cabinets in the mscabd_cabinet::next chain.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  filename the filename of the file to search for cabinets. This
+   *                  is passed directly to mspack_system::open().
+   * @return a pointer to a mscabd_cabinet structure, or NULL
+   * @see close(), open(), last_error()
+   */
+  struct mscabd_cabinet * (*search) (struct mscab_decompressor *self,
+                                     const char *filename);
+
+  /**
+   * Appends one mscabd_cabinet to another, forming or extending a cabinet
+   * set.
+   *
+   * This will attempt to append one cabinet to another such that
+   * <tt>(cab->nextcab == nextcab) && (nextcab->prevcab == cab)</tt> and
+   * any folders split between the two cabinets are merged.
+   *
+   * The cabinets MUST be part of a cabinet set -- a cabinet set is a
+   * cabinet that spans more than one physical cabinet file on disk -- and
+   * must be appropriately matched.
+   *
+   * It can be determined if a cabinet has further parts to load by
+   * examining the mscabd_cabinet::flags field:
+   *
+   * - if <tt>(flags & MSCAB_HDR_PREVCAB)</tt> is non-zero, there is a
+   *   predecessor cabinet to open() and prepend(). Its MS-DOS
+   *   case-insensitive filename is mscabd_cabinet::prevname
+   * - if <tt>(flags & MSCAB_HDR_NEXTCAB)</tt> is non-zero, there is a
+   *   successor cabinet to open() and append(). Its MS-DOS case-insensitive
+   *   filename is mscabd_cabinet::nextname
+   *
+   * If the cabinets do not match, an error code will be returned. Neither
+   * cabinet has been altered, and both should be closed seperately.
+   *
+   * Files and folders in a cabinet set are a single entity. All cabinets
+   * in a set use the same file list, which is updated as cabinets in the
+   * set are added. All pointers to mscabd_folder and mscabd_file
+   * structures in either cabinet must be discarded and re-obtained after
+   * merging.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  cab      the cabinet which will be appended to,
+   *                  predecessor of nextcab
+   * @param  nextcab  the cabinet which will be appended,
+   *                  successor of cab
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see prepend(), open(), close()
+   */
+  int (*append) (struct mscab_decompressor *self,
+                 struct mscabd_cabinet *cab,
+                 struct mscabd_cabinet *nextcab);
+
+  /**
+   * Prepends one mscabd_cabinet to another, forming or extending a
+   * cabinet set.
+   *
+   * This will attempt to prepend one cabinet to another, such that
+   * <tt>(cab->prevcab == prevcab) && (prevcab->nextcab == cab)</tt>. In
+   * all other respects, it is identical to append(). See append() for the
+   * full documentation.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  cab      the cabinet which will be prepended to,
+   *                  successor of prevcab
+   * @param  prevcab  the cabinet which will be prepended,
+   *                  predecessor of cab
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see append(), open(), close()
+   */
+  int (*prepend) (struct mscab_decompressor *self,
+                  struct mscabd_cabinet *cab,
+                  struct mscabd_cabinet *prevcab);
+
+  /**
+   * Extracts a file from a cabinet or cabinet set.
+   *
+   * This extracts a compressed file in a cabinet and writes it to the given
+   * filename.
+   *
+   * The MS-DOS filename of the file, mscabd_file::filename, is NOT USED
+   * by extract(). The caller must examine this MS-DOS filename, copy and
+   * change it as necessary, create directories as necessary, and provide
+   * the correct filename as a parameter, which will be passed unchanged
+   * to the decompressor's mspack_system::open()
+   *
+   * If the file belongs to a split folder in a multi-part cabinet set,
+   * and not enough parts of the cabinet set have been loaded and appended
+   * or prepended, an error will be returned immediately.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  file     the file to be decompressed
+   * @param  filename the filename of the file being written to
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*extract)(struct mscab_decompressor *self,
+                 struct mscabd_file *file,
+                 const char *filename);
+
+  /**
+   * Sets a CAB decompression engine parameter.
+   *
+   * The following parameters are defined:
+   * - #MSCABD_PARAM_SEARCHBUF: How many bytes should be allocated as a
+   *   buffer when using search()? The minimum value is 4.  The default
+   *   value is 32768.
+   * - #MSCABD_PARAM_FIXMSZIP: If non-zero, extract() will ignore bad
+   *   checksums and recover from decompression errors in MS-ZIP
+   *   compressed folders. The default value is 0 (don't recover).
+   * - #MSCABD_PARAM_DECOMPBUF: How many bytes should be used as an input
+   *   bit buffer by decompressors? The minimum value is 4. The default
+   *   value is 4096.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @param  param    the parameter to set
+   * @param  value    the value to set the parameter to
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if there
+   *         is a problem with either parameter or value.
+   * @see search(), extract()
+   */
+  int (*set_param)(struct mscab_decompressor *self,
+                   int param,
+                   int value);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * This is useful for open() and search(), which do not return an error
+   * code directly.
+   *
+   * @param  self     a self-referential pointer to the mscab_decompressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see open(), search()
+   */
+  int (*last_error)(struct mscab_decompressor *self);
+};
+
+/* --- support for .CHM (HTMLHelp) file format ----------------------------- */
+
+/**
+ * A structure which represents a file to be placed in a CHM helpfile.
+ *
+ * A contiguous array of these structures should be passed to
+ * mschm_compressor::generate(). The array list is terminated with an
+ * entry whose mschmc_file::section field is set to #MSCHMC_ENDLIST, the
+ * other fields in this entry are ignored.
+ */
+struct mschmc_file {
+  /** One of #MSCHMC_ENDLIST, #MSCHMC_UNCOMP or #MSCHMC_MSCOMP. */
+  int section;
+
+  /** The filename of the source file that will be added to the CHM. This
+   * is passed directly to mspack_system::open(). */
+  const char *filename;
+
+  /** The full path and filename of the file within the CHM helpfile, a
+   * UTF-1 encoded null-terminated string. */
+  char *chm_filename;
+
+  /** The length of the file, in bytes. This will be adhered to strictly
+   * and a read error will be issued if this many bytes cannot be read
+   * from the real file at CHM generation time. */
+  off_t length;
+};
+
+/**
+ * A structure which represents a section of a CHM helpfile.
+ *
+ * All fields are READ ONLY.
+ *
+ * Not used directly, but used as a generic base type for
+ * mschmd_sec_uncompressed and mschmd_sec_mscompressed.
+ */
+struct mschmd_section {
+  /** A pointer to the CHM helpfile that contains this section. */
+  struct mschmd_header *chm;
+
+  /**
+   * The section ID. Either 0 for the uncompressed section
+   * mschmd_sec_uncompressed, or 1 for the LZX compressed section
+   * mschmd_sec_mscompressed. No other section IDs are known.
+   */
+  unsigned int id;
+};
+
+/**
+ * A structure which represents the uncompressed section of a CHM helpfile.
+ * 
+ * All fields are READ ONLY.
+ */
+struct mschmd_sec_uncompressed {
+  /** Generic section data. */
+  struct mschmd_section base;
+
+  /** The file offset of where this section begins in the CHM helpfile. */
+  off_t offset;
+};
+
+/**
+ * A structure which represents the LZX compressed section of a CHM helpfile. 
+ * 
+ * All fields are READ ONLY.
+ */
+struct mschmd_sec_mscompressed {
+  /** Generic section data. */
+  struct mschmd_section base;
+
+  /** A pointer to the meta-file which represents all LZX compressed data. */
+  struct mschmd_file *content;
+
+  /** A pointer to the file which contains the LZX control data. */
+  struct mschmd_file *control;
+
+  /** A pointer to the file which contains the LZX reset table. */
+  struct mschmd_file *rtable;
+
+  /** A pointer to the file which contains the LZX span information.
+   * Available only in CHM decoder version 2 and above.
+   */
+  struct mschmd_file *spaninfo;
+};
+
+/**
+ * A structure which represents a CHM helpfile.
+ * 
+ * All fields are READ ONLY.
+ */
+struct mschmd_header {
+  /** The version of the CHM file format used in this file. */
+  unsigned int version;
+
+  /**
+   * The "timestamp" of the CHM helpfile. 
+   *
+   * It is the lower 32 bits of a 64-bit value representing the number of
+   * centiseconds since 1601-01-01 00:00:00 UTC, plus 42. It is not useful
+   * as a timestamp, but it is useful as a semi-unique ID.
+   */
+  unsigned int timestamp;
+      
+  /**
+   * The default Language and Country ID (LCID) of the user who ran the
+   * HTMLHelp Compiler. This is not the language of the CHM file itself.
+   */
+  unsigned int language;
+
+  /**
+   * The filename of the CHM helpfile. This is given by the library user
+   * and may be in any format.
+   */
+  const char *filename;
+
+  /** The length of the CHM helpfile, in bytes. */
+  off_t length;
+
+  /** A list of all non-system files in the CHM helpfile. */
+  struct mschmd_file *files;
+
+  /**
+   * A list of all system files in the CHM helpfile.
+   *
+   * System files are files which begin with "::". They are meta-files
+   * generated by the CHM creation process.
+   */
+  struct mschmd_file *sysfiles;
+
+  /** The section 0 (uncompressed) data in this CHM helpfile. */
+  struct mschmd_sec_uncompressed sec0;
+
+  /** The section 1 (MSCompressed) data in this CHM helpfile. */
+  struct mschmd_sec_mscompressed sec1;
+
+  /** The file offset of the first PMGL/PMGI directory chunk. */
+  off_t dir_offset;
+
+  /** The number of PMGL/PMGI directory chunks in this CHM helpfile. */
+  unsigned int num_chunks;
+
+  /** The size of each PMGL/PMGI chunk, in bytes. */
+  unsigned int chunk_size;
+
+  /** The "density" of the quick-reference section in PMGL/PMGI chunks. */
+  unsigned int density;
+
+  /** The depth of the index tree.
+   *
+   * - if 1, there are no PMGI chunks, only PMGL chunks.
+   * - if 2, there is 1 PMGI chunk. All chunk indices point to PMGL chunks.
+   * - if 3, the root PMGI chunk points to secondary PMGI chunks, which in
+   *         turn point to PMGL chunks.
+   * - and so on...
+   */
+  unsigned int depth;
+
+  /**
+   * The number of the root PMGI chunk.
+   *
+   * If there is no index in the CHM helpfile, this will be 0xFFFFFFFF.
+   */
+  unsigned int index_root;
+
+  /**
+   * The number of the first PMGL chunk. Usually zero.
+   * Available only in CHM decoder version 2 and above.
+   */
+  unsigned int first_pmgl;
+
+  /**
+   * The number of the last PMGL chunk. Usually num_chunks-1.
+   * Available only in CHM decoder version 2 and above.
+   */
+  unsigned int last_pmgl;
+
+  /**
+   * A cache of loaded chunks, filled in by mschm_decoder::fast_find().
+   * Available only in CHM decoder version 2 and above.
+   */
+  unsigned char **chunk_cache;
+};
+
+/**
+ * A structure which represents a file stored in a CHM helpfile.
+ * 
+ * All fields are READ ONLY.
+ */
+struct mschmd_file {
+  /**
+   * A pointer to the next file in the list, or NULL if this is the final
+   * file.
+   */
+  struct mschmd_file *next;
+
+  /**
+   * A pointer to the section that this file is located in. Indirectly,
+   * it also points to the CHM helpfile the file is located in.
+   */
+  struct mschmd_section *section;
+
+  /** The offset within the section data that this file is located at. */
+  off_t offset;
+
+  /** The length of this file, in bytes */
+  off_t length;
+
+  /** The filename of this file -- a null terminated string in UTF-8. */
+  char *filename;
+};
+
+/** mschmc_file::section value: end of CHM file list */
+#define MSCHMC_ENDLIST   (0)
+/** mschmc_file::section value: this file is in the Uncompressed section */
+#define MSCHMC_UNCOMP    (1)
+/** mschmc_file::section value: this file is in the MSCompressed section */
+#define MSCHMC_MSCOMP    (2)
+ 
+/** mschm_compressor::set_param() parameter: "timestamp" header */
+#define MSCHMC_PARAM_TIMESTAMP  (0)
+/** mschm_compressor::set_param() parameter: "language" header */
+#define MSCHMC_PARAM_LANGUAGE   (1)
+/** mschm_compressor::set_param() parameter: LZX window size */
+#define MSCHMC_PARAM_LZXWINDOW  (2)
+/** mschm_compressor::set_param() parameter: intra-chunk quickref density */
+#define MSCHMC_PARAM_DENSITY    (3)
+/** mschm_compressor::set_param() parameter: whether to create indices */
+#define MSCHMC_PARAM_INDEX      (4)
+
+/**
+ * A compressor for .CHM (Microsoft HTMLHelp) files.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_chm_compressor(), mspack_destroy_chm_compressor()
+ */
+struct mschm_compressor {
+  /**
+   * Generates a CHM help file.
+   *
+   * The help file will contain up to two sections, an Uncompressed
+   * section and potentially an MSCompressed (LZX compressed)
+   * section.
+   *
+   * While the contents listing of a CHM file is always in lexical order,
+   * the file list passed in will be taken as the correct order for files
+   * within the sections.  It is in your interest to place similar files
+   * together for better compression.
+   *
+   * There are two modes of generation, to use a temporary file or not to
+   * use one. See use_temporary_file() for the behaviour of generate() in
+   * these two different modes.
+   *
+   * @param  self        a self-referential pointer to the mschm_compressor
+   *                     instance being called
+   * @param  file_list   an array of mschmc_file structures, terminated
+   *                     with an entry whose mschmc_file::section field is
+   *                     #MSCHMC_ENDLIST. The order of the list is
+   *                     preserved within each section. The length of any
+   *                     mschmc_file::chm_filename string cannot exceed
+   *                     roughly 4096 bytes. Each source file must be able
+   *                     to supply as many bytes as given in the
+   *                     mschmc_file::length field.
+   * @param  output_file the file to write the generated CHM helpfile to.
+   *                     This is passed directly to mspack_system::open()
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see use_temporary_file() set_param()
+   */
+  int (*generate)(struct mschm_compressor *self,
+                  struct mschmc_file file_list[],
+                  const char *output_file);
+
+  /**
+   * Specifies whether a temporary file is used during CHM generation.
+   *
+   * The CHM file format includes data about the compressed section (such
+   * as its overall size) that is stored in the output CHM file prior to
+   * the compressed section itself. This unavoidably requires that the
+   * compressed section has to be generated, before these details can be
+   * set. There are several ways this can be handled. Firstly, the
+   * compressed section could be generated entirely in memory before
+   * writing any of the output CHM file. This approach is not used in
+   * libmspack, as the compressed section can exceed the addressable
+   * memory space on most architectures.
+   *
+   * libmspack has two options, either to write these unknowable sections
+   * with blank data, generate the compressed section, then re-open the
+   * output file for update once the compressed section has been
+   * completed, or to write the compressed section to a temporary file,
+   * then write the entire output file at once, performing a simple
+   * file-to-file copy for the compressed section.
+   *
+   * The simple solution of buffering the entire compressed section in
+   * memory can still be used, if desired. As the temporary file's
+   * filename is passed directly to mspack_system::open(), it is possible
+   * for a custom mspack_system implementation to hold this file in memory,
+   * without writing to a disk.
+   *
+   * If a temporary file is set, generate() performs the following
+   * sequence of events: the temporary file is opened for writing, the
+   * compression algorithm writes to the temporary file, the temporary
+   * file is closed.  Then the output file is opened for writing and the
+   * temporary file is re-opened for reading. The output file is written
+   * and the temporary file is read from. Both files are then closed. The
+   * temporary file itself is not deleted. If that is desired, the
+   * temporary file should be deleted after the completion of generate(),
+   * if it exists.
+   *
+   * If a temporary file is set not to be used, generate() performs the
+   * following sequence of events: the output file is opened for writing,
+   * then it is written and closed. The output file is then re-opened for
+   * update, the appropriate sections are seek()ed to and re-written, then
+   * the output file is closed.
+   *
+   * @param  self          a self-referential pointer to the
+   *                       mschm_compressor instance being called
+   * @param  use_temp_file non-zero if the temporary file should be used,
+   *                       zero if the temporary file should not be used.
+   * @param  temp_file     a file to temporarily write compressed data to,
+   *                       before opening it for reading and copying the
+   *                       contents to the output file. This is passed
+   *                       directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see generate()
+   */
+  int (*use_temporary_file)(struct mschm_compressor *self,
+                            int use_temp_file,
+                            const char *temp_file);
+  /**
+   * Sets a CHM compression engine parameter.
+   *
+   * The following parameters are defined:
+
+   * - #MSCHMC_PARAM_TIMESTAMP: Sets the "timestamp" of the CHM file
+   *   generated. This is not a timestamp, see mschmd_header::timestamp
+   *   for a description. If this timestamp is 0, generate() will use its
+   *   own algorithm for making a unique ID, based on the lengths and
+   *   names of files in the CHM itself. Defaults to 0, any value between
+   *   0 and (2^32)-1 is valid.
+   * - #MSCHMC_PARAM_LANGUAGE: Sets the "language" of the CHM file
+   *   generated.  This is not the language used in the CHM file, but the
+   *   language setting of the user who ran the HTMLHelp compiler. It
+   *   defaults to 0x0409. The valid range is between 0x0000 and 0x7F7F.
+   * - #MSCHMC_PARAM_LZXWINDOW: Sets the size of the LZX history window,
+   *   which is also the interval at which the compressed data stream can be
+   *   randomly accessed. The value is not a size in bytes, but a power of
+   *   two. The default value is 16 (which makes the window 2^16 bytes, or
+   *   64 kilobytes), the valid range is from 15 (32 kilobytes) to 21 (2
+   *   megabytes).
+   * - #MSCHMC_PARAM_DENSITY: Sets the "density" of quick reference
+   *   entries stored at the end of directory listing chunk. Each chunk is
+   *   4096 bytes in size, and contains as many file entries as there is
+   *   room for. At the other end of the chunk, a list of "quick reference"
+   *   pointers is included. The offset of every 'N'th file entry is given a
+   *   quick reference, where N = (2^density) + 1. The default density is
+   *   2. The smallest density is 0 (N=2), the maximum is 10 (N=1025). As
+   *   each file entry requires at least 5 bytes, the maximum number of
+   *   entries in a single chunk is roughly 800, so the maximum value 10
+   *   can be used to indicate there are no quickrefs at all.
+   * - #MSCHMC_PARAM_INDEX: Sets whether or not to include quick lookup
+   *   index chunk(s), in addition to normal directory listing chunks. A
+   *   value of zero means no index chunks will be created, a non-zero value
+   *   means index chunks will be created. The default is zero, "don't
+   *   create an index".
+   *
+   * @param  self     a self-referential pointer to the mschm_compressor
+   *                  instance being called
+   * @param  param    the parameter to set
+   * @param  value    the value to set the parameter to
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if there
+   *         is a problem with either parameter or value.
+   * @see generate()
+   */
+  int (*set_param)(struct mschm_compressor *self,
+                   int param,
+                   int value);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * @param  self     a self-referential pointer to the mschm_compressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see set_param(), generate()
+   */
+  int (*last_error)(struct mschm_compressor *self);
+};
+
+/**
+ * A decompressor for .CHM (Microsoft HTMLHelp) files
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_chm_decompressor(), mspack_destroy_chm_decompressor()
+ */
+struct mschm_decompressor {
+  /**
+   * Opens a CHM helpfile and reads its contents.
+   *
+   * If the file opened is a valid CHM helpfile, all headers will be read
+   * and a mschmd_header structure will be returned, with a full list of
+   * files.
+   *
+   * In the case of an error occuring, NULL is returned and the error code
+   * is available from last_error().
+   *
+   * The filename pointer should be considered "in use" until close() is
+   * called on the CHM helpfile.
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @param  filename the filename of the CHM helpfile. This is passed
+   *                  directly to mspack_system::open().
+   * @return a pointer to a mschmd_header structure, or NULL on failure
+   * @see close()
+   */
+  struct mschmd_header *(*open)(struct mschm_decompressor *self,
+                                const char *filename);
+
+  /**
+   * Closes a previously opened CHM helpfile.
+   *
+   * This closes a CHM helpfile, frees the mschmd_header and all
+   * mschmd_file structures associated with it (if any). This works on
+   * both helpfiles opened with open() and helpfiles opened with
+   * fast_open().
+   *
+   * The CHM header pointer is now invalid and cannot be used again. All
+   * mschmd_file pointers referencing that CHM are also now invalid, and
+   * cannot be used again.
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @param  chm      the CHM helpfile to close
+   * @see open(), fast_open()
+   */
+  void (*close)(struct mschm_decompressor *self,
+                struct mschmd_header *chm);
+
+  /**
+   * Extracts a file from a CHM helpfile.
+   *
+   * This extracts a file from a CHM helpfile and writes it to the given
+   * filename. The filename of the file, mscabd_file::filename, is not
+   * used by extract(), but can be used by the caller as a guide for
+   * constructing an appropriate filename.
+   *
+   * This method works both with files found in the mschmd_header::files
+   * and mschmd_header::sysfiles list and mschmd_file structures generated
+   * on the fly by fast_find().
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @param  file     the file to be decompressed
+   * @param  filename the filename of the file being written to
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*extract)(struct mschm_decompressor *self,
+                 struct mschmd_file *file,
+                 const char *filename);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * This is useful for open() and fast_open(), which do not return an
+   * error code directly.
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see open(), extract()
+   */
+  int (*last_error)(struct mschm_decompressor *self);
+
+  /**
+   * Opens a CHM helpfile quickly.
+   *
+   * If the file opened is a valid CHM helpfile, only essential headers
+   * will be read. A mschmd_header structure will be still be returned, as
+   * with open(), but the mschmd_header::files field will be NULL. No
+   * files details will be automatically read.  The fast_find() method
+   * must be used to obtain file details.
+   *
+   * In the case of an error occuring, NULL is returned and the error code
+   * is available from last_error().
+   *
+   * The filename pointer should be considered "in use" until close() is
+   * called on the CHM helpfile.
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @param  filename the filename of the CHM helpfile. This is passed
+   *                  directly to mspack_system::open().
+   * @return a pointer to a mschmd_header structure, or NULL on failure
+   * @see open(), close(), fast_find(), extract()
+   */
+  struct mschmd_header *(*fast_open)(struct mschm_decompressor *self,
+                                     const char *filename);
+
+  /**
+   * Finds file details quickly.
+   *
+   * Instead of reading all CHM helpfile headers and building a list of
+   * files, fast_open() and fast_find() are intended for finding file
+   * details only when they are needed. The CHM file format includes an
+   * on-disk file index to allow this.
+   *
+   * Given a case-sensitive filename, fast_find() will search the on-disk
+   * index for that file.
+   *
+   * If the file was found, the caller-provided mschmd_file structure will
+   * be filled out like so:
+   * - section: the correct value for the found file
+   * - offset: the correct value for the found file
+   * - length: the correct value for the found file
+   * - all other structure elements: NULL or 0
+   *
+   * If the file was not found, MSPACK_ERR_OK will still be returned as the
+   * result, but the caller-provided structure will be filled out like so:
+   * - section: NULL
+   * - offset: 0
+   * - length: 0
+   * - all other structure elements: NULL or 0
+   *
+   * This method is intended to be used in conjunction with CHM helpfiles
+   * opened with fast_open(), but it also works with helpfiles opened
+   * using the regular open().
+   *
+   * @param  self     a self-referential pointer to the mschm_decompressor
+   *                  instance being called
+   * @param  chm      the CHM helpfile to search for the file
+   * @param  filename the filename of the file to search for
+   * @param  f_ptr    a pointer to a caller-provded mschmd_file structure
+   * @param  f_size   <tt>sizeof(struct mschmd_file)</tt>
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see open(), close(), fast_find(), extract()
+   */
+  int (*fast_find)(struct mschm_decompressor *self,
+                   struct mschmd_header *chm,
+                   const char *filename,
+                   struct mschmd_file *f_ptr,
+                   int f_size);
+};
+
+/* --- support for .LIT (EBook) file format -------------------------------- */
+
+/** TODO */
+struct mslit_compressor {
+  int dummy; 
+};
+
+/** TODO */
+struct mslit_decompressor {
+  int dummy; 
+};
+
+
+/* --- support for .HLP (MS Help) file format ------------------------------ */
+
+/** TODO */
+struct mshlp_compressor {
+  int dummy; 
+};
+
+/** TODO */
+struct mshlp_decompressor {
+  int dummy; 
+};
+
+
+/* --- support for SZDD file format ---------------------------------------- */
+
+/** msszdd_compressor::set_param() parameter: the missing character */
+#define MSSZDDC_PARAM_MISSINGCHAR (0)
+
+/** msszddd_header::format value - a regular SZDD file */
+#define MSSZDD_FMT_NORMAL (0)
+
+/** msszddd_header::format value - a special QBasic SZDD file */
+#define MSSZDD_FMT_QBASIC (1)
+
+/**
+ * A structure which represents an SZDD compressed file.
+ *
+ * All fields are READ ONLY.
+ */
+struct msszddd_header {
+  /** The file format; either #MSSZDD_FMT_NORMAL or #MSSZDD_FMT_QBASIC */
+  int format;
+
+  /** The amount of data in the SZDD file once uncompressed. */
+  off_t length;
+
+  /**
+   * The last character in the filename, traditionally replaced with an
+   * underscore to show the file is compressed. The null character is used
+   * to show that this character has not been stored (e.g. because the
+   * filename is not known). Generally, only characters that may appear in
+   * an MS-DOS filename (except ".") are valid.
+   */
+  char missing_char;
+};
+
+/**
+ * A compressor for the SZDD file format.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_szdd_compressor(), mspack_destroy_szdd_compressor()
+ */
+struct msszdd_compressor {
+  /**
+   * Reads an input file and creates a compressed output file in the
+   * SZDD compressed file format. The SZDD compression format is quick
+   * but gives poor compression. It is possible for the compressed output
+   * file to be larger than the input file.
+   *
+   * Conventionally, SZDD compressed files have the final character in
+   * their filename replaced with an underscore, to show they are
+   * compressed.  The missing character is stored in the compressed file
+   * itself. This is due to the restricted filename conventions of MS-DOS,
+   * most operating systems, such as UNIX, simply append another file
+   * extension to the existing filename. As mspack does not deal with
+   * filenames, this is left up to you. If you wish to set the missing
+   * character stored in the file header, use set_param() with the
+   * #MSSZDDC_PARAM_MISSINGCHAR parameter.
+   *
+   * "Stream" compression (where the length of the input data is not
+   * known) is not possible. The length of the input data is stored in the
+   * header of the SZDD file and must therefore be known before any data
+   * is compressed. Due to technical limitations of the file format, the
+   * maximum size of uncompressed file that will be accepted is 2147483647
+   * bytes.
+   *
+   * @param  self    a self-referential pointer to the msszdd_compressor
+   *                 instance being called
+   * @param  input   the name of the file to compressed. This is passed
+   *                 passed directly to mspack_system::open()
+   * @param  output  the name of the file to write compressed data to.
+   *                 This is passed directly to mspack_system::open().
+   * @param  length  the length of the uncompressed file, or -1 to indicate
+   *                 that this should be determined automatically by using
+   *                 mspack_system::seek() on the input file.
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see set_param()
+   */
+  int (*compress)(struct msszdd_compressor *self,
+                  const char *input,
+                  const char *output,
+                  off_t length);
+
+  /**
+   * Sets an SZDD compression engine parameter.
+   *
+   * The following parameters are defined:
+
+   * - #MSSZDDC_PARAM_CHARACTER: the "missing character", the last character
+   *   in the uncompressed file's filename, which is traditionally replaced
+   *   with an underscore to show the file is compressed. Traditionally,
+   *   this can only be a character that is a valid part of an MS-DOS,
+   *   filename, but libmspack permits any character between 0x00 and 0xFF
+   *   to be stored. 0x00 is the default, and it represents "no character
+   *   stored".
+   *
+   * @param  self     a self-referential pointer to the msszdd_compressor
+   *                  instance being called
+   * @param  param    the parameter to set
+   * @param  value    the value to set the parameter to
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if there
+   *         is a problem with either parameter or value.
+   * @see compress()
+   */
+  int (*set_param)(struct msszdd_compressor *self,
+                   int param,
+                   int value);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * @param  self     a self-referential pointer to the msszdd_compressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see compress()
+   */
+  int (*last_error)(struct mschm_decompressor *self);
+};
+
+/**
+ * A decompressor for SZDD compressed files.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_szdd_decompressor(), mspack_destroy_szdd_decompressor()
+ */
+struct msszdd_decompressor {
+  /**
+   * Opens a SZDD file and reads the header.
+   *
+   * If the file opened is a valid SZDD file, all headers will be read and
+   * a msszddd_header structure will be returned.
+   *
+   * In the case of an error occuring, NULL is returned and the error code
+   * is available from last_error().
+   *
+   * The filename pointer should be considered "in use" until close() is
+   * called on the SZDD file.
+   *
+   * @param  self     a self-referential pointer to the msszdd_decompressor
+   *                  instance being called
+   * @param  filename the filename of the SZDD compressed file. This is
+   *                  passed directly to mspack_system::open().
+   * @return a pointer to a msszddd_header structure, or NULL on failure
+   * @see close()
+   */
+  struct msszddd_header *(*open)(struct msszdd_decompressor *self,
+                                 const char *filename);
+
+  /**
+   * Closes a previously opened SZDD file.
+   *
+   * This closes a SZDD file and frees the msszddd_header associated with
+   * it.
+   *
+   * The SZDD header pointer is now invalid and cannot be used again.
+   *
+   * @param  self     a self-referential pointer to the msszdd_decompressor
+   *                  instance being called
+   * @param  szdd     the SZDD file to close
+   * @see open()
+   */
+  void (*close)(struct msszdd_decompressor *self,
+                struct msszddd_header *szdd);
+
+  /**
+   * Extracts the compressed data from a SZDD file.
+   *
+   * This decompresses the compressed SZDD data stream and writes it to
+   * an output file.
+   *
+   * @param  self     a self-referential pointer to the msszdd_decompressor
+   *                  instance being called
+   * @param  szdd     the SZDD file to extract data from
+   * @param  filename the filename to write the decompressed data to. This
+   *                  is passed directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*extract)(struct msszdd_decompressor *self,
+                 struct msszddd_header *szdd,
+                 const char *filename);
+
+  /**
+   * Decompresses an SZDD file to an output file in one step.
+   *
+   * This opens an SZDD file as input, reads the header, then decompresses
+   * the compressed data immediately to an output file, finally closing
+   * both the input and output file. It is more convenient to use than
+   * open() then extract() then close(), if you do not need to know the
+   * SZDD output size or missing character.
+   *
+   * @param  self     a self-referential pointer to the msszdd_decompressor
+   *                  instance being called
+   * @param  input    the filename of the input SZDD file. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename to write the decompressed data to. This
+   *                  is passed directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*decompress)(struct msszdd_decompressor *self,
+                    const char *input,
+                    const char *output);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * This is useful for open() which does not return an
+   * error code directly.
+   *
+   * @param  self     a self-referential pointer to the msszdd_decompressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see open(), extract(), decompress()
+   */
+  int (*last_error)(struct msszdd_decompressor *self);
+};
+
+/* --- support for KWAJ file format ---------------------------------------- */
+
+/** mskwaj_compressor::set_param() parameter: compression type */
+#define MSKWAJC_PARAM_COMP_TYPE  (0)
+
+/** mskwaj_compressor::set_param() parameter: include the length of the
+ * uncompressed file in the header?
+ */
+#define MSKWAJC_PARAM_INCLUDE_LENGTH (1)
+
+/** KWAJ compression type: no compression. */
+#define MSKWAJ_COMP_NONE (0)
+/** KWAJ compression type: no compression, 0xFF XOR "encryption". */
+#define MSKWAJ_COMP_XOR (1)
+/** KWAJ compression type: LZSS (same method as SZDD) */
+#define MSKWAJ_COMP_SZDD (2)
+/** KWAJ compression type: LZ+Huffman compression */
+#define MSKWAJ_COMP_LZH (3)
+/** KWAJ compression type: MSZIP */
+#define MSKWAJ_COMP_MSZIP (4)
+
+/** KWAJ optional header flag: decompressed file length is included */
+#define MSKWAJ_HDR_HASLENGTH (0x01)
+
+/** KWAJ optional header flag: unknown 2-byte structure is included */
+#define MSKWAJ_HDR_HASUNKNOWN1 (0x02)
+
+/** KWAJ optional header flag: unknown multi-sized structure is included */
+#define MSKWAJ_HDR_HASUNKNOWN2 (0x04)
+
+/** KWAJ optional header flag: file name (no extension) is included */
+#define MSKWAJ_HDR_HASFILENAME (0x08)
+
+/** KWAJ optional header flag: file extension is included */
+#define MSKWAJ_HDR_HASFILEEXT (0x10)
+
+/** KWAJ optional header flag: extra text is included */
+#define MSKWAJ_HDR_HASEXTRATEXT (0x20)
+
+/**
+ * A structure which represents an KWAJ compressed file.
+ *
+ * All fields are READ ONLY.
+ */
+struct mskwajd_header {
+  /** The compression type; should be one of #MSKWAJ_COMP_NONE,
+   * #MSKWAJ_COMP_XOR, #MSKWAJ_COMP_SZDD or #MSKWAJ_COMP_LZH
+   */
+  unsigned short comp_type;
+
+  /** The offset in the file where the compressed data stream begins */
+  off_t data_offset;
+
+  /** Flags indicating which optional headers were included. */
+  int headers;
+
+  /** The amount of uncompressed data in the file, or 0 if not present. */
+  off_t length;
+
+  /** output filename, or NULL if not present */
+  char *filename;
+
+  /** extra uncompressed data (usually text) in the header.
+   * This data can contain nulls so use extra_length to get the size.
+   */
+  char *extra;
+
+  /** length of extra uncompressed data in the header */
+  unsigned short extra_length;
+};
+
+/**
+ * A compressor for the KWAJ file format.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_kwaj_compressor(), mspack_destroy_kwaj_compressor()
+ */
+struct mskwaj_compressor {
+  /**
+   * Reads an input file and creates a compressed output file in the
+   * KWAJ compressed file format. The KWAJ compression format is quick
+   * but gives poor compression. It is possible for the compressed output
+   * file to be larger than the input file.
+   *
+   * @param  self    a self-referential pointer to the mskwaj_compressor
+   *                 instance being called
+   * @param  input   the name of the file to compressed. This is passed
+   *                 passed directly to mspack_system::open()
+   * @param  output  the name of the file to write compressed data to.
+   *                 This is passed directly to mspack_system::open().
+   * @param  length  the length of the uncompressed file, or -1 to indicate
+   *                 that this should be determined automatically by using
+   *                 mspack_system::seek() on the input file.
+   * @return an error code, or MSPACK_ERR_OK if successful
+   * @see set_param()
+   */
+  int (*compress)(struct mskwaj_compressor *self,
+                  const char *input,
+                  const char *output,
+                  off_t length);
+
+  /**
+   * Sets an KWAJ compression engine parameter.
+   *
+   * The following parameters are defined:
+   *
+   * - #MSKWAJC_PARAM_COMP_TYPE: the compression method to use. Must
+   *   be one of #MSKWAJC_COMP_NONE, #MSKWAJC_COMP_XOR, #MSKWAJ_COMP_SZDD
+   *   or #MSKWAJ_COMP_LZH. The default is #MSKWAJ_COMP_LZH.
+   *
+   * - #MSKWAJC_PARAM_INCLUDE_LENGTH: a boolean; should the compressed
+   *   output file should include the uncompressed length of the input
+   *   file in the header? This adds 4 bytes to the size of the output
+   *   file. A value of zero says "no", non-zero says "yes". The default
+   *   is "no".
+   *
+   * @param  self     a self-referential pointer to the mskwaj_compressor
+   *                  instance being called
+   * @param  param    the parameter to set
+   * @param  value    the value to set the parameter to
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if there
+   *         is a problem with either parameter or value.
+   * @see generate()
+   */
+  int (*set_param)(struct mskwaj_compressor *self,
+                   int param,
+                   int value);
+
+
+  /**
+   * Sets the original filename of the file before compression,
+   * which will be stored in the header of the output file.
+   *
+   * The filename should be a null-terminated string, it must be an
+   * MS-DOS "8.3" type filename (up to 8 bytes for the filename, then
+   * optionally a "." and up to 3 bytes for a filename extension).
+   *
+   * If NULL is passed as the filename, no filename is included in the
+   * header. This is the default.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_compressor
+   *                  instance being called
+   * @param  filename the original filename to use
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if the
+   *         filename is too long
+   */
+  int (*set_filename)(struct mskwaj_compressor *self,
+                      const char *filename);
+
+  /**
+   * Sets arbitrary data that will be stored in the header of the
+   * output file, uncompressed. It can be up to roughly 64 kilobytes,
+   * as the overall size of the header must not exceed 65535 bytes.
+   * The data can contain null bytes if desired.
+   *
+   * If NULL is passed as the data pointer, or zero is passed as the
+   * length, no extra data is included in the header. This is the
+   * default.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_compressor
+   *                  instance being called
+   * @param  data     a pointer to the data to be stored in the header
+   * @param  bytes    the length of the data in bytes
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS extra data
+   *         is too long
+   */
+  int (*set_extra_data)(struct mskwaj_compressor *self,
+                        void *data,
+                        size_t bytes);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_compressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see compress()
+   */
+  int (*last_error)(struct mschm_decompressor *self);
+};
+
+/**
+ * A decompressor for KWAJ compressed files.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_kwaj_decompressor(), mspack_destroy_kwaj_decompressor()
+ */
+struct mskwaj_decompressor {
+  /**
+   * Opens a KWAJ file and reads the header.
+   *
+   * If the file opened is a valid KWAJ file, all headers will be read and
+   * a mskwajd_header structure will be returned.
+   *
+   * In the case of an error occuring, NULL is returned and the error code
+   * is available from last_error().
+   *
+   * The filename pointer should be considered "in use" until close() is
+   * called on the KWAJ file.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_decompressor
+   *                  instance being called
+   * @param  filename the filename of the KWAJ compressed file. This is
+   *                  passed directly to mspack_system::open().
+   * @return a pointer to a mskwajd_header structure, or NULL on failure
+   * @see close()
+   */
+  struct mskwajd_header *(*open)(struct mskwaj_decompressor *self,
+                                 const char *filename);
+
+  /**
+   * Closes a previously opened KWAJ file.
+   *
+   * This closes a KWAJ file and frees the mskwajd_header associated
+   * with it. The KWAJ header pointer is now invalid and cannot be
+   * used again.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_decompressor
+   *                  instance being called
+   * @param  kwaj     the KWAJ file to close
+   * @see open()
+   */
+  void (*close)(struct mskwaj_decompressor *self,
+                struct mskwajd_header *kwaj);
+
+  /**
+   * Extracts the compressed data from a KWAJ file.
+   *
+   * This decompresses the compressed KWAJ data stream and writes it to
+   * an output file.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_decompressor
+   *                  instance being called
+   * @param  kwaj     the KWAJ file to extract data from
+   * @param  filename the filename to write the decompressed data to. This
+   *                  is passed directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*extract)(struct mskwaj_decompressor *self,
+                 struct mskwajd_header *kwaj,
+                 const char *filename);
+
+  /**
+   * Decompresses an KWAJ file to an output file in one step.
+   *
+   * This opens an KWAJ file as input, reads the header, then decompresses
+   * the compressed data immediately to an output file, finally closing
+   * both the input and output file. It is more convenient to use than
+   * open() then extract() then close(), if you do not need to know the
+   * KWAJ output size or output filename.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_decompressor
+   *                  instance being called
+   * @param  input    the filename of the input KWAJ file. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename to write the decompressed data to. This
+   *                  is passed directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*decompress)(struct mskwaj_decompressor *self,
+                    const char *input,
+                    const char *output);
+
+  /**
+   * Returns the error code set by the most recently called method.
+   *
+   * This is useful for open() which does not return an
+   * error code directly.
+   *
+   * @param  self     a self-referential pointer to the mskwaj_decompressor
+   *                  instance being called
+   * @return the most recent error code
+   * @see open(), search()
+   */
+  int (*last_error)(struct mskwaj_decompressor *self);
+};
+
+/* --- support for .LZX (Offline Address Book) file format ----------------- */
+
+/**
+ * A compressor for the Offline Address Book (OAB) format.
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_oab_compressor(), mspack_destroy_oab_compressor()
+ */
+struct msoab_compressor {
+  /**
+   * Compress a full OAB file.
+   *
+   * The input file will be read and the compressed contents written to the
+   * output file.
+   *
+   * @param  self     a self-referential pointer to the msoab_decompressor
+   *                  instance being called
+   * @param  input    the filename of the input file. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename of the output file. This is passed
+   *                  directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*compress) (struct msoab_compressor *self,
+                   const char *input,
+                   const char *output);
+
+  /**
+   * Generate a compressed incremental OAB patch file.
+   *
+   * The two uncompressed files "input" and "base" will be read, and an
+   * incremental patch to generate "input" from "base" will be written to
+   * the output file.
+   *
+   * @param  self     a self-referential pointer to the msoab_compressor
+   *                  instance being called
+   * @param  input    the filename of the input file containing the new
+   *                  version of its contents. This is passed directly
+   *                  to mspack_system::open().
+   * @param  base     the filename of the original base file containing
+   *                  the old version of its contents, against which the
+   *                  incremental patch shall generated. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename of the output file. This is passed
+   *                  directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*compress_incremental) (struct msoab_compressor *self,
+                               const char *input,
+                               const char *base,
+                               const char *output);
+};
+
+/**
+ * A decompressor for .LZX (Offline Address Book) files
+ *
+ * All fields are READ ONLY.
+ *
+ * @see mspack_create_oab_decompressor(), mspack_destroy_oab_decompressor()
+ */
+struct msoab_decompressor {
+  /**
+   * Decompresses a full Offline Address Book file.
+   *
+   * If the input file is a valid compressed Offline Address Book file, 
+   * it will be read and the decompressed contents will be written to
+   * the output file.
+   *
+   * @param  self     a self-referential pointer to the msoab_decompressor
+   *                  instance being called
+   * @param  input    the filename of the input file. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename of the output file. This is passed
+   *                  directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*decompress) (struct msoab_decompressor *self,
+                     const char *input,
+                     const char *output);
+
+  /**
+   * Decompresses an Offline Address Book with an incremental patch file.
+   *
+   * This requires both a full UNCOMPRESSED Offline Address Book file to
+   * act as the "base", and a compressed incremental patch file as input.
+   * If the input file is valid, it will be decompressed with reference to
+   * the base file, and the decompressed contents will be written to the
+   * output file.
+   *
+   * There is no way to tell what the right base file is for the given
+   * incremental patch, but if you get it wrong, this will usually result
+   * in incorrect data being decompressed, which will then fail a checksum
+   * test.
+   *
+   * @param  self     a self-referential pointer to the msoab_decompressor
+   *                  instance being called
+   * @param  input    the filename of the input file. This is passed
+   *                  directly to mspack_system::open().
+   * @param  base     the filename of the base file to which the
+   *                  incremental patch shall be applied. This is passed
+   *                  directly to mspack_system::open().
+   * @param  output   the filename of the output file. This is passed
+   *                  directly to mspack_system::open().
+   * @return an error code, or MSPACK_ERR_OK if successful
+   */
+  int (*decompress_incremental) (struct msoab_decompressor *self,
+                                 const char *input,
+                                 const char *base,
+                                 const char *output);
+
+  /**
+   * Sets an OAB decompression engine parameter. Available only in OAB
+   * decompressor version 2 and above.
+   *
+   * - #MSOABD_PARAM_DECOMPBUF: How many bytes should be used as an input
+   *   buffer by decompressors? The minimum value is 16. The default value
+   *   is 4096.
+   *
+   * @param  self     a self-referential pointer to the msoab_decompressor
+   *                  instance being called
+   * @param  param    the parameter to set
+   * @param  value    the value to set the parameter to
+   * @return MSPACK_ERR_OK if all is OK, or MSPACK_ERR_ARGS if there
+   *         is a problem with either parameter or value.
+   */
+  int (*set_param)(struct msoab_decompressor *self,
+                   int param,
+                   int value);
+
+};
+
+/** msoab_decompressor::set_param() parameter: size of decompression buffer */
+#define MSOABD_PARAM_DECOMPBUF (0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/mszip.h b/utils/rbutilqt/mspack/mszip.h
new file mode 100644
index 0000000000..2cd608234e
--- /dev/null
+++ b/utils/rbutilqt/mspack/mszip.h
@@ -0,0 +1,126 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * The deflate method was created by Phil Katz. MSZIP is equivalent to the
+ * deflate method.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_MSZIP_H
+#define MSPACK_MSZIP_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* MSZIP (deflate) compression / (inflate) decompression definitions */
+
+#define MSZIP_FRAME_SIZE          (32768) /* size of LZ history window */
+#define MSZIP_LITERAL_MAXSYMBOLS  (288)   /* literal/length huffman tree */
+#define MSZIP_LITERAL_TABLEBITS   (9)
+#define MSZIP_DISTANCE_MAXSYMBOLS (32)    /* distance huffman tree */
+#define MSZIP_DISTANCE_TABLEBITS  (6)
+
+/* if there are less direct lookup entries than symbols, the longer
+ * code pointers will be <= maxsymbols. This must not happen, or we
+ * will decode entries badly */
+#if (1 << MSZIP_LITERAL_TABLEBITS) < (MSZIP_LITERAL_MAXSYMBOLS * 2)
+# define MSZIP_LITERAL_TABLESIZE (MSZIP_LITERAL_MAXSYMBOLS * 4)
+#else
+# define MSZIP_LITERAL_TABLESIZE ((1 << MSZIP_LITERAL_TABLEBITS) + \
+                                  (MSZIP_LITERAL_MAXSYMBOLS * 2))
+#endif
+
+#if (1 << MSZIP_DISTANCE_TABLEBITS) < (MSZIP_DISTANCE_MAXSYMBOLS * 2)
+# define MSZIP_DISTANCE_TABLESIZE (MSZIP_DISTANCE_MAXSYMBOLS * 4)
+#else
+# define MSZIP_DISTANCE_TABLESIZE ((1 << MSZIP_DISTANCE_TABLEBITS) + \
+                                  (MSZIP_DISTANCE_MAXSYMBOLS * 2))
+#endif
+
+struct mszipd_stream {
+  struct mspack_system *sys;            /* I/O routines          */
+  struct mspack_file   *input;          /* input file handle     */
+  struct mspack_file   *output;         /* output file handle    */
+  unsigned int window_posn;             /* offset within window  */
+
+  /* inflate() will call this whenever the window should be emptied. */
+  int (*flush_window)(struct mszipd_stream *, unsigned int);
+
+  int error, repair_mode, bytes_output;
+
+  /* I/O buffering */
+  unsigned char *inbuf, *i_ptr, *i_end, *o_ptr, *o_end, input_end;
+  unsigned int bit_buffer, bits_left, inbuf_size;
+
+
+  /* huffman code lengths */
+  unsigned char  LITERAL_len[MSZIP_LITERAL_MAXSYMBOLS];
+  unsigned char  DISTANCE_len[MSZIP_DISTANCE_MAXSYMBOLS];
+
+  /* huffman decoding tables */
+  unsigned short LITERAL_table [MSZIP_LITERAL_TABLESIZE];
+  unsigned short DISTANCE_table[MSZIP_DISTANCE_TABLESIZE];
+
+  /* 32kb history window */
+  unsigned char window[MSZIP_FRAME_SIZE];
+};
+
+/* allocates MS-ZIP decompression stream for decoding the given stream.
+ *
+ * - uses system->alloc() to allocate memory
+ *
+ * - returns NULL if not enough memory
+ *
+ * - input_buffer_size is how many bytes to use as an input bitstream buffer
+ *
+ * - if repair_mode is non-zero, errors in decompression will be skipped
+ *   and 'holes' left will be filled with zero bytes. This allows at least
+ *   a partial recovery of erroneous data.
+ */
+extern struct mszipd_stream *mszipd_init(struct mspack_system *system,
+                                        struct mspack_file *input,
+                                        struct mspack_file *output,
+                                        int input_buffer_size,
+                                        int repair_mode);
+
+/* decompresses, or decompresses more of, an MS-ZIP stream.
+ *
+ * - out_bytes of data will be decompressed and the function will return
+ *   with an MSPACK_ERR_OK return code.
+ *
+ * - decompressing will stop as soon as out_bytes is reached. if the true
+ *   amount of bytes decoded spills over that amount, they will be kept for
+ *   a later invocation of mszipd_decompress().
+ *
+ * - the output bytes will be passed to the system->write() function given in
+ *   mszipd_init(), using the output file handle given in mszipd_init(). More
+ *   than one call may be made to system->write()
+ *
+ * - MS-ZIP will read input bytes as necessary using the system->read()
+ *   function given in mszipd_init(), using the input file handle given in
+ *   mszipd_init(). This will continue until system->read() returns 0 bytes,
+ *   or an error.
+ */
+extern int mszipd_decompress(struct mszipd_stream *zip, off_t out_bytes);
+
+/* decompresses an entire MS-ZIP stream in a KWAJ file. Acts very much
+ * like mszipd_decompress(), but doesn't take an out_bytes parameter
+ */
+extern int mszipd_decompress_kwaj(struct mszipd_stream *zip);
+
+/* frees all stream associated with an MS-ZIP data stream
+ *
+ * - calls system->free() using the system pointer given in mszipd_init()
+ */
+void mszipd_free(struct mszipd_stream *zip);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/mszipc.c b/utils/rbutilqt/mspack/mszipc.c
new file mode 100644
index 0000000000..2f14b9ac83
--- /dev/null
+++ b/utils/rbutilqt/mspack/mszipc.c
@@ -0,0 +1,18 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * The deflate method was created by Phil Katz. MSZIP is equivalent to the
+ * deflate method.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* MS-ZIP compression implementation */
+
+#include "system-mspack.h"
+#include "mszip.h"
+
+/* todo */
diff --git a/utils/rbutilqt/mspack/mszipd.c b/utils/rbutilqt/mspack/mszipd.c
new file mode 100644
index 0000000000..c1b02b1207
--- /dev/null
+++ b/utils/rbutilqt/mspack/mszipd.c
@@ -0,0 +1,515 @@
+/* This file is part of libmspack.
+ * (C) 2003-2010 Stuart Caie.
+ *
+ * The deflate method was created by Phil Katz. MSZIP is equivalent to the
+ * deflate method.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* MS-ZIP decompression implementation. */
+
+#include "system-mspack.h"
+#include "mszip.h"
+
+/* import bit-reading macros and code */
+#define BITS_TYPE struct mszipd_stream
+#define BITS_VAR zip
+#define BITS_ORDER_LSB
+#define BITS_LSB_TABLE
+#define READ_BYTES do {         \
+    READ_IF_NEEDED;             \
+    INJECT_BITS(*i_ptr++, 8);   \
+} while (0)
+#include "readbits.h"
+
+/* import huffman macros and code */
+#define TABLEBITS(tbl)      MSZIP_##tbl##_TABLEBITS
+#define MAXSYMBOLS(tbl)     MSZIP_##tbl##_MAXSYMBOLS
+#define HUFF_TABLE(tbl,idx) zip->tbl##_table[idx]
+#define HUFF_LEN(tbl,idx)   zip->tbl##_len[idx]
+#define HUFF_ERROR          return INF_ERR_HUFFSYM
+#include "readhuff.h"
+
+#define FLUSH_IF_NEEDED do {                            \
+    if (zip->window_posn == MSZIP_FRAME_SIZE) {         \
+        if (zip->flush_window(zip, MSZIP_FRAME_SIZE)) { \
+            return INF_ERR_FLUSH;                       \
+        }                                               \
+        zip->window_posn = 0;                           \
+    }                                                   \
+} while (0)
+
+/* match lengths for literal codes 257.. 285 */
+static const unsigned short lit_lengths[29] = {
+  3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27,
+  31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258
+};
+
+/* match offsets for distance codes 0 .. 29 */
+static const unsigned short dist_offsets[30] = {
+  1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385,
+  513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577
+};
+
+/* extra bits required for literal codes 257.. 285 */
+static const unsigned char lit_extrabits[29] = {
+  0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2,
+  2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0
+};
+
+/* extra bits required for distance codes 0 .. 29 */
+static const unsigned char dist_extrabits[30] = {
+  0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,
+  6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13
+};
+
+/* the order of the bit length Huffman code lengths */
+static const unsigned char bitlen_order[19] = {
+  16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
+};
+
+/* inflate() error codes */
+#define INF_ERR_BLOCKTYPE   (-1)  /* unknown block type                      */
+#define INF_ERR_COMPLEMENT  (-2)  /* block size complement mismatch          */
+#define INF_ERR_FLUSH       (-3)  /* error from flush_window() callback      */
+#define INF_ERR_BITBUF      (-4)  /* too many bits in bit buffer             */
+#define INF_ERR_SYMLENS     (-5)  /* too many symbols in blocktype 2 header  */
+#define INF_ERR_BITLENTBL   (-6)  /* failed to build bitlens huffman table   */
+#define INF_ERR_LITERALTBL  (-7)  /* failed to build literals huffman table  */
+#define INF_ERR_DISTANCETBL (-8)  /* failed to build distance huffman table  */
+#define INF_ERR_BITOVERRUN  (-9)  /* bitlen RLE code goes over table size    */
+#define INF_ERR_BADBITLEN   (-10) /* invalid bit-length code                 */
+#define INF_ERR_LITCODE     (-11) /* out-of-range literal code               */
+#define INF_ERR_DISTCODE    (-12) /* out-of-range distance code              */
+#define INF_ERR_DISTANCE    (-13) /* somehow, distance is beyond 32k         */
+#define INF_ERR_HUFFSYM     (-14) /* out of bits decoding huffman symbol     */
+
+static int zip_read_lens(struct mszipd_stream *zip) {
+  /* for the bit buffer and huffman decoding */
+  register unsigned int bit_buffer;
+  register int bits_left;
+  unsigned char *i_ptr, *i_end;
+
+  /* bitlen Huffman codes -- immediate lookup, 7 bit max code length */
+  unsigned short bl_table[(1 << 7)];
+  unsigned char bl_len[19];
+
+  unsigned char lens[MSZIP_LITERAL_MAXSYMBOLS + MSZIP_DISTANCE_MAXSYMBOLS];
+  unsigned int lit_codes, dist_codes, code, last_code=0, bitlen_codes, i, run;
+
+  RESTORE_BITS;
+
+  /* read the number of codes */
+  READ_BITS(lit_codes,    5); lit_codes    += 257;
+  READ_BITS(dist_codes,   5); dist_codes   += 1;
+  READ_BITS(bitlen_codes, 4); bitlen_codes += 4;
+  if (lit_codes  > MSZIP_LITERAL_MAXSYMBOLS)  return INF_ERR_SYMLENS;
+  if (dist_codes > MSZIP_DISTANCE_MAXSYMBOLS) return INF_ERR_SYMLENS;
+
+  /* read in the bit lengths in their unusual order */
+  for (i = 0; i < bitlen_codes; i++) READ_BITS(bl_len[bitlen_order[i]], 3);
+  while (i < 19) bl_len[bitlen_order[i++]] = 0;
+
+  /* create decoding table with an immediate lookup */
+  if (make_decode_table(19, 7, &bl_len[0], &bl_table[0])) {
+    return INF_ERR_BITLENTBL;
+  }
+
+  /* read literal / distance code lengths */
+  for (i = 0; i < (lit_codes + dist_codes); i++) {
+    /* single-level huffman lookup */
+    ENSURE_BITS(7);
+    code = bl_table[PEEK_BITS(7)];
+    REMOVE_BITS(bl_len[code]);
+
+    if (code < 16) lens[i] = last_code = code;
+    else {
+      switch (code) {
+      case 16: READ_BITS(run, 2); run += 3;  code = last_code; break;
+      case 17: READ_BITS(run, 3); run += 3;  code = 0;         break;
+      case 18: READ_BITS(run, 7); run += 11; code = 0;         break;
+      default: D(("bad code!: %u", code)) return INF_ERR_BADBITLEN;
+      }
+      if ((i + run) > (lit_codes + dist_codes)) return INF_ERR_BITOVERRUN;
+      while (run--) lens[i++] = code;
+      i--;
+    }
+  }
+
+  /* copy LITERAL code lengths and clear any remaining */
+  i = lit_codes;
+  zip->sys->copy(&lens[0], &zip->LITERAL_len[0], i);
+  while (i < MSZIP_LITERAL_MAXSYMBOLS) zip->LITERAL_len[i++] = 0;
+
+  i = dist_codes;
+  zip->sys->copy(&lens[lit_codes], &zip->DISTANCE_len[0], i);
+  while (i < MSZIP_DISTANCE_MAXSYMBOLS) zip->DISTANCE_len[i++] = 0;
+
+  STORE_BITS;
+  return 0;
+}
+
+/* a clean implementation of RFC 1951 / inflate */
+static int inflate(struct mszipd_stream *zip) {
+  unsigned int last_block, block_type, distance, length, this_run, i;
+
+  /* for the bit buffer and huffman decoding */
+  register unsigned int bit_buffer;
+  register int bits_left;
+  register unsigned short sym;
+  unsigned char *i_ptr, *i_end;
+
+  RESTORE_BITS;
+
+  do {
+    /* read in last block bit */
+    READ_BITS(last_block, 1);
+
+    /* read in block type */
+    READ_BITS(block_type, 2);
+
+    if (block_type == 0) {
+      /* uncompressed block */
+      unsigned char lens_buf[4];
+
+      /* go to byte boundary */
+      i = bits_left & 7; REMOVE_BITS(i);
+
+      /* read 4 bytes of data, emptying the bit-buffer if necessary */
+      for (i = 0; (bits_left >= 8); i++) {
+        if (i == 4) return INF_ERR_BITBUF;
+        lens_buf[i] = PEEK_BITS(8);
+        REMOVE_BITS(8);
+      }
+      if (bits_left != 0) return INF_ERR_BITBUF;
+      while (i < 4) {
+        READ_IF_NEEDED;
+        lens_buf[i++] = *i_ptr++;
+      }
+
+      /* get the length and its complement */
+      length = lens_buf[0] | (lens_buf[1] << 8);
+      i      = lens_buf[2] | (lens_buf[3] << 8);
+      if (length != (~i & 0xFFFF)) return INF_ERR_COMPLEMENT;
+
+      /* read and copy the uncompressed data into the window */
+      while (length > 0) {
+        READ_IF_NEEDED;
+
+        this_run = length;
+        if (this_run > (unsigned int)(i_end - i_ptr)) this_run = i_end - i_ptr;
+        if (this_run > (MSZIP_FRAME_SIZE - zip->window_posn))
+          this_run = MSZIP_FRAME_SIZE - zip->window_posn;
+
+        zip->sys->copy(i_ptr, &zip->window[zip->window_posn], this_run);
+        zip->window_posn += this_run;
+        i_ptr    += this_run;
+        length   -= this_run;
+        FLUSH_IF_NEEDED;
+      }
+    }
+    else if ((block_type == 1) || (block_type == 2)) {
+      /* Huffman-compressed LZ77 block */
+      unsigned int match_posn, code;
+
+      if (block_type == 1) {
+        /* block with fixed Huffman codes */
+        i = 0;
+        while (i < 144) zip->LITERAL_len[i++] = 8;
+        while (i < 256) zip->LITERAL_len[i++] = 9;
+        while (i < 280) zip->LITERAL_len[i++] = 7;
+        while (i < 288) zip->LITERAL_len[i++] = 8;
+        for (i = 0; i < 32; i++) zip->DISTANCE_len[i] = 5;
+      }
+      else {
+        /* block with dynamic Huffman codes */
+        STORE_BITS;
+        if ((i = zip_read_lens(zip))) return i;
+        RESTORE_BITS;
+      }
+
+      /* now huffman lengths are read for either kind of block, 
+       * create huffman decoding tables */
+      if (make_decode_table(MSZIP_LITERAL_MAXSYMBOLS, MSZIP_LITERAL_TABLEBITS,
+                            &zip->LITERAL_len[0], &zip->LITERAL_table[0]))
+      {
+        return INF_ERR_LITERALTBL;
+      }
+
+      if (make_decode_table(MSZIP_DISTANCE_MAXSYMBOLS,MSZIP_DISTANCE_TABLEBITS,
+                            &zip->DISTANCE_len[0], &zip->DISTANCE_table[0]))
+      {
+        return INF_ERR_DISTANCETBL;
+      }
+
+      /* decode forever until end of block code */
+      for (;;) {
+        READ_HUFFSYM(LITERAL, code);
+        if (code < 256) {
+          zip->window[zip->window_posn++] = (unsigned char) code;
+          FLUSH_IF_NEEDED;
+        }
+        else if (code == 256) {
+          /* END OF BLOCK CODE: loop break point */
+          break;
+        }
+        else {
+          code -= 257; /* codes 257-285 are matches */
+          if (code >= 29) return INF_ERR_LITCODE; /* codes 286-287 are illegal */
+          READ_BITS_T(length, lit_extrabits[code]);
+          length += lit_lengths[code];
+
+          READ_HUFFSYM(DISTANCE, code);
+          if (code >= 30) return INF_ERR_DISTCODE;
+          READ_BITS_T(distance, dist_extrabits[code]);
+          distance += dist_offsets[code];
+
+          /* match position is window position minus distance. If distance
+           * is more than window position numerically, it must 'wrap
+           * around' the frame size. */ 
+          match_posn = ((distance > zip->window_posn) ? MSZIP_FRAME_SIZE : 0)
+            + zip->window_posn - distance;
+
+          /* copy match */
+          if (length < 12) {
+            /* short match, use slower loop but no loop setup code */
+            while (length--) {
+              zip->window[zip->window_posn++] = zip->window[match_posn++];
+              match_posn &= MSZIP_FRAME_SIZE - 1;
+              FLUSH_IF_NEEDED;
+            }
+          }
+          else {
+            /* longer match, use faster loop but with setup expense */
+            unsigned char *runsrc, *rundest;
+            do {
+              this_run = length;
+              if ((match_posn + this_run) > MSZIP_FRAME_SIZE)
+                this_run = MSZIP_FRAME_SIZE - match_posn;
+              if ((zip->window_posn + this_run) > MSZIP_FRAME_SIZE)
+                this_run = MSZIP_FRAME_SIZE - zip->window_posn;
+
+              rundest = &zip->window[zip->window_posn]; zip->window_posn += this_run;
+              runsrc  = &zip->window[match_posn];  match_posn  += this_run;
+              length -= this_run;
+              while (this_run--) *rundest++ = *runsrc++;
+              if (match_posn == MSZIP_FRAME_SIZE) match_posn = 0;
+              FLUSH_IF_NEEDED;
+            } while (length > 0);
+          }
+
+        } /* else (code >= 257) */
+
+      } /* for(;;) -- break point at 'code == 256' */
+    }
+    else {
+      /* block_type == 3 -- bad block type */
+      return INF_ERR_BLOCKTYPE;
+    }
+  } while (!last_block);
+
+  /* flush the remaining data */
+  if (zip->window_posn) {
+    if (zip->flush_window(zip, zip->window_posn)) return INF_ERR_FLUSH;
+  }
+  STORE_BITS;
+
+  /* return success */
+  return 0;
+}
+
+/* inflate() calls this whenever the window should be flushed. As
+ * MSZIP only expands to the size of the window, the implementation used
+ * simply keeps track of the amount of data flushed, and if more than 32k
+ * is flushed, an error is raised.
+ */  
+static int mszipd_flush_window(struct mszipd_stream *zip,
+                               unsigned int data_flushed)
+{
+  zip->bytes_output += data_flushed;
+  if (zip->bytes_output > MSZIP_FRAME_SIZE) {
+    D(("overflow: %u bytes flushed, total is now %u",
+       data_flushed, zip->bytes_output))
+    return 1;
+  }
+  return 0;
+}
+
+struct mszipd_stream *mszipd_init(struct mspack_system *system,
+                                  struct mspack_file *input,
+                                  struct mspack_file *output,
+                                  int input_buffer_size,
+                                  int repair_mode)
+{
+  struct mszipd_stream *zip;
+
+  if (!system) return NULL;
+
+  /* round up input buffer size to multiple of two */
+  input_buffer_size = (input_buffer_size + 1) & -2;
+  if (input_buffer_size < 2) return NULL;
+
+  /* allocate decompression state */
+  if (!(zip = (struct mszipd_stream *) system->alloc(system, sizeof(struct mszipd_stream)))) {
+    return NULL;
+  }
+
+  /* allocate input buffer */
+  zip->inbuf  = (unsigned char *) system->alloc(system, (size_t) input_buffer_size);
+  if (!zip->inbuf) {
+    system->free(zip);
+    return NULL;
+  }
+
+  /* initialise decompression state */
+  zip->sys             = system;
+  zip->input           = input;
+  zip->output          = output;
+  zip->inbuf_size      = input_buffer_size;
+  zip->input_end       = 0;
+  zip->error           = MSPACK_ERR_OK;
+  zip->repair_mode     = repair_mode;
+  zip->flush_window    = &mszipd_flush_window;
+
+  zip->i_ptr = zip->i_end = &zip->inbuf[0];
+  zip->o_ptr = zip->o_end = NULL;
+  zip->bit_buffer = 0; zip->bits_left = 0;
+  return zip;
+}
+
+int mszipd_decompress(struct mszipd_stream *zip, off_t out_bytes) {
+  /* for the bit buffer */
+  register unsigned int bit_buffer;
+  register int bits_left;
+  unsigned char *i_ptr, *i_end;
+
+  int i, state, error;
+
+  /* easy answers */
+  if (!zip || (out_bytes < 0)) return MSPACK_ERR_ARGS;
+  if (zip->error) return zip->error;
+
+  /* flush out any stored-up bytes before we begin */
+  i = zip->o_end - zip->o_ptr;
+  if ((off_t) i > out_bytes) i = (int) out_bytes;
+  if (i) {
+    if (zip->sys->write(zip->output, zip->o_ptr, i) != i) {
+      return zip->error = MSPACK_ERR_WRITE;
+    }
+    zip->o_ptr  += i;
+    out_bytes   -= i;
+  }
+  if (out_bytes == 0) return MSPACK_ERR_OK;
+
+
+  while (out_bytes > 0) {
+    /* unpack another block */
+    RESTORE_BITS;
+
+    /* skip to next read 'CK' header */
+    i = bits_left & 7; REMOVE_BITS(i); /* align to bytestream */
+    state = 0;
+    do {
+      READ_BITS(i, 8);
+      if (i == 'C') state = 1;
+      else if ((state == 1) && (i == 'K')) state = 2;
+      else state = 0;
+    } while (state != 2);
+
+    /* inflate a block, repair and realign if necessary */
+    zip->window_posn = 0;
+    zip->bytes_output = 0;
+    STORE_BITS;
+    if ((error = inflate(zip))) {
+      D(("inflate error %d", error))
+      if (zip->repair_mode) {
+        /* recover partially-inflated buffers */
+        if (zip->bytes_output == 0 && zip->window_posn > 0) {
+          zip->flush_window(zip, zip->window_posn);
+        }
+        zip->sys->message(NULL, "MSZIP error, %u bytes of data lost.",
+                          MSZIP_FRAME_SIZE - zip->bytes_output);
+        for (i = zip->bytes_output; i < MSZIP_FRAME_SIZE; i++) {
+          zip->window[i] = '\0';
+        }
+        zip->bytes_output = MSZIP_FRAME_SIZE;
+      }
+      else {
+        return zip->error = (error > 0) ? error : MSPACK_ERR_DECRUNCH;
+      }
+    }
+    zip->o_ptr = &zip->window[0];
+    zip->o_end = &zip->o_ptr[zip->bytes_output];
+
+    /* write a frame */
+    i = (out_bytes < (off_t)zip->bytes_output) ?
+      (int)out_bytes : zip->bytes_output;
+    if (zip->sys->write(zip->output, zip->o_ptr, i) != i) {
+      return zip->error = MSPACK_ERR_WRITE;
+    }
+
+    /* mspack errors (i.e. read errors) are fatal and can't be recovered */
+    if ((error > 0) && zip->repair_mode) return error;
+
+    zip->o_ptr  += i;
+    out_bytes   -= i;
+  }
+
+  if (out_bytes) {
+    D(("bytes left to output"))
+    return zip->error = MSPACK_ERR_DECRUNCH;
+  }
+  return MSPACK_ERR_OK;
+}
+
+int mszipd_decompress_kwaj(struct mszipd_stream *zip) {
+    /* for the bit buffer */
+    register unsigned int bit_buffer;
+    register int bits_left;
+    unsigned char *i_ptr, *i_end;
+
+    int i, error, block_len;
+
+    /* unpack blocks until block_len == 0 */
+    for (;;) {
+        RESTORE_BITS;
+
+        /* align to bytestream, read block_len */
+        i = bits_left & 7; REMOVE_BITS(i);
+        READ_BITS(block_len, 8);
+        READ_BITS(i, 8); block_len |= i << 8;
+
+        if (block_len == 0) break;
+
+        /* read "CK" header */
+        READ_BITS(i, 8); if (i != 'C') return MSPACK_ERR_DATAFORMAT;
+        READ_BITS(i, 8); if (i != 'K') return MSPACK_ERR_DATAFORMAT;
+
+        /* inflate block */
+        zip->window_posn = 0;
+        zip->bytes_output = 0;
+        STORE_BITS;
+        if ((error = inflate(zip))) {
+            D(("inflate error %d", error))
+            return zip->error = (error > 0) ? error : MSPACK_ERR_DECRUNCH;
+        }
+
+        /* write inflated block */
+        if (zip->sys->write(zip->output, &zip->window[0], zip->bytes_output)
+            != zip->bytes_output) return zip->error = MSPACK_ERR_WRITE;
+    }
+    return MSPACK_ERR_OK;
+}
+
+void mszipd_free(struct mszipd_stream *zip) {
+  struct mspack_system *sys;
+  if (zip) {
+    sys = zip->sys;
+    sys->free(zip->inbuf);
+    sys->free(zip);
+  }
+}
diff --git a/utils/rbutilqt/mspack/qtm.h b/utils/rbutilqt/mspack/qtm.h
new file mode 100644
index 0000000000..20a38538a2
--- /dev/null
+++ b/utils/rbutilqt/mspack/qtm.h
@@ -0,0 +1,128 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * The Quantum method was created by David Stafford, adapted by Microsoft
+ * Corporation.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_QTM_H
+#define MSPACK_QTM_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Quantum compression / decompression definitions */
+
+#define QTM_FRAME_SIZE (32768)
+
+struct qtmd_modelsym {
+  unsigned short sym, cumfreq;
+};
+
+struct qtmd_model {
+  int shiftsleft, entries;
+  struct qtmd_modelsym *syms;
+};
+
+struct qtmd_stream {
+  struct mspack_system *sys;      /* I/O routines                            */
+  struct mspack_file   *input;    /* input file handle                       */
+  struct mspack_file   *output;   /* output file handle                      */
+
+  unsigned char *window;          /* decoding window                         */
+  unsigned int window_size;       /* window size                             */
+  unsigned int window_posn;       /* decompression offset within window      */
+  unsigned int frame_todo;        /* bytes remaining for current frame       */
+
+  unsigned short H, L, C;         /* high/low/current: arith coding state    */
+  unsigned char header_read;      /* have we started decoding a new frame?   */
+
+  int error;
+
+  /* I/O buffers */
+  unsigned char *inbuf, *i_ptr, *i_end, *o_ptr, *o_end;
+  unsigned int  bit_buffer, inbuf_size;
+  unsigned char bits_left, input_end;
+
+  /* four literal models, each representing 64 symbols
+   * model0 for literals from   0 to  63 (selector = 0)
+   * model1 for literals from  64 to 127 (selector = 1)
+   * model2 for literals from 128 to 191 (selector = 2)
+   * model3 for literals from 129 to 255 (selector = 3) */
+  struct qtmd_model model0, model1, model2, model3;
+
+  /* three match models.
+   * model4 for match with fixed length of 3 bytes
+   * model5 for match with fixed length of 4 bytes
+   * model6 for variable length match, encoded with model6len model */
+  struct qtmd_model model4, model5, model6, model6len;
+
+  /* selector model. 0-6 to say literal (0,1,2,3) or match (4,5,6) */
+  struct qtmd_model model7;
+
+  /* symbol arrays for all models */
+  struct qtmd_modelsym m0sym[64 + 1];
+  struct qtmd_modelsym m1sym[64 + 1];
+  struct qtmd_modelsym m2sym[64 + 1];
+  struct qtmd_modelsym m3sym[64 + 1];
+  struct qtmd_modelsym m4sym[24 + 1];
+  struct qtmd_modelsym m5sym[36 + 1];
+  struct qtmd_modelsym m6sym[42 + 1], m6lsym[27 + 1];
+  struct qtmd_modelsym m7sym[7 + 1];
+};
+
+/* allocates Quantum decompression state for decoding the given stream.
+ *
+ * - returns NULL if window_bits is outwith the range 10 to 21 (inclusive).
+ *
+ * - uses system->alloc() to allocate memory
+ *
+ * - returns NULL if not enough memory
+ *
+ * - window_bits is the size of the Quantum window, from 1Kb (10) to 2Mb (21).
+ *
+ * - input_buffer_size is the number of bytes to use to store bitstream data.
+ */
+extern struct qtmd_stream *qtmd_init(struct mspack_system *system,
+                                     struct mspack_file *input,
+                                     struct mspack_file *output,
+                                     int window_bits,
+                                     int input_buffer_size);
+
+/* decompresses, or decompresses more of, a Quantum stream.
+ *
+ * - out_bytes of data will be decompressed and the function will return
+ *   with an MSPACK_ERR_OK return code.
+ *
+ * - decompressing will stop as soon as out_bytes is reached. if the true
+ *   amount of bytes decoded spills over that amount, they will be kept for
+ *   a later invocation of qtmd_decompress().
+ *
+ * - the output bytes will be passed to the system->write() function given in
+ *   qtmd_init(), using the output file handle given in qtmd_init(). More
+ *   than one call may be made to system->write()
+ *
+ * - Quantum will read input bytes as necessary using the system->read()
+ *   function given in qtmd_init(), using the input file handle given in
+ *   qtmd_init(). This will continue until system->read() returns 0 bytes,
+ *   or an error.
+ */
+extern int qtmd_decompress(struct qtmd_stream *qtm, off_t out_bytes);
+
+/* frees all state associated with a Quantum data stream
+ *
+ * - calls system->free() using the system pointer given in qtmd_init()
+ */
+void qtmd_free(struct qtmd_stream *qtm);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/qtmd.c b/utils/rbutilqt/mspack/qtmd.c
new file mode 100644
index 0000000000..58e4787b7f
--- /dev/null
+++ b/utils/rbutilqt/mspack/qtmd.c
@@ -0,0 +1,490 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * The Quantum method was created by David Stafford, adapted by Microsoft
+ * Corporation.
+ *
+ * This decompressor is based on an implementation by Matthew Russotto, used
+ * with permission.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* Quantum decompression implementation */
+
+/* This decompressor was researched and implemented by Matthew Russotto. It
+ * has since been tidied up by Stuart Caie. More information can be found at
+ * http://www.speakeasy.org/~russotto/quantumcomp.html
+ */
+
+#include "system-mspack.h"
+#include "qtm.h"
+
+/* import bit-reading macros and code */
+#define BITS_TYPE struct qtmd_stream
+#define BITS_VAR qtm
+#define BITS_ORDER_MSB
+#define READ_BYTES do {                 \
+    unsigned char b0, b1;               \
+    READ_IF_NEEDED; b0 = *i_ptr++;      \
+    READ_IF_NEEDED; b1 = *i_ptr++;      \
+    INJECT_BITS((b0 << 8) | b1, 16);    \
+} while (0)
+#include "readbits.h"
+
+/* Quantum static data tables:
+ *
+ * Quantum uses 'position slots' to represent match offsets.  For every
+ * match, a small 'position slot' number and a small offset from that slot
+ * are encoded instead of one large offset.
+ *
+ * position_base[] is an index to the position slot bases
+ *
+ * extra_bits[] states how many bits of offset-from-base data is needed.
+ *
+ * length_base[] and length_extra[] are equivalent in function, but are
+ * used for encoding selector 6 (variable length match) match lengths,
+ * instead of match offsets.
+ *
+ * They are generated with the following code:
+ *   unsigned int i, offset;
+ *   for (i = 0, offset = 0; i < 42; i++) {
+ *     position_base[i] = offset;
+ *     extra_bits[i] = ((i < 2) ? 0 : (i - 2)) >> 1;
+ *     offset += 1 << extra_bits[i];
+ *   }
+ *   for (i = 0, offset = 0; i < 26; i++) {
+ *     length_base[i] = offset;
+ *     length_extra[i] = (i < 2 ? 0 : i - 2) >> 2;
+ *     offset += 1 << length_extra[i];
+ *   }
+ *   length_base[26] = 254; length_extra[26] = 0;
+ */
+static const unsigned int position_base[42] = {
+  0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 512, 768,
+  1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384, 24576, 32768, 49152,
+  65536, 98304, 131072, 196608, 262144, 393216, 524288, 786432, 1048576, 1572864
+};
+static const unsigned char extra_bits[42] = {
+  0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10,
+  11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19
+};
+static const unsigned char length_base[27] = {
+  0, 1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 18, 22, 26,
+  30, 38, 46, 54, 62, 78, 94, 110, 126, 158, 190, 222, 254
+};
+static const unsigned char length_extra[27] = {
+  0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
+  3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0
+};
+
+
+/* Arithmetic decoder:
+ * 
+ * GET_SYMBOL(model, var) fetches the next symbol from the stated model
+ * and puts it in var.
+ *
+ * If necessary, qtmd_update_model() is called.
+ */
+#define GET_SYMBOL(model, var) do {                                     \
+  range = ((H - L) & 0xFFFF) + 1;                                       \
+  symf = ((((C - L + 1) * model.syms[0].cumfreq)-1) / range) & 0xFFFF;  \
+                                                                        \
+  for (i = 1; i < model.entries; i++) {                                 \
+    if (model.syms[i].cumfreq <= symf) break;                           \
+  }                                                                     \
+  (var) = model.syms[i-1].sym;                                          \
+                                                                        \
+  range = (H - L) + 1;                                                  \
+  symf = model.syms[0].cumfreq;                                         \
+  H = L + ((model.syms[i-1].cumfreq * range) / symf) - 1;               \
+  L = L + ((model.syms[i].cumfreq   * range) / symf);                   \
+                                                                        \
+  do { model.syms[--i].cumfreq += 8; } while (i > 0);                   \
+  if (model.syms[0].cumfreq > 3800) qtmd_update_model(&model);          \
+                                                                        \
+  while (1) {                                                           \
+    if ((L & 0x8000) != (H & 0x8000)) {                                 \
+      if ((L & 0x4000) && !(H & 0x4000)) {                              \
+        /* underflow case */                                            \
+        C ^= 0x4000; L &= 0x3FFF; H |= 0x4000;                          \
+      }                                                                 \
+      else break;                                                       \
+    }                                                                   \
+    L <<= 1; H = (H << 1) | 1;                                          \
+    ENSURE_BITS(1);                                                     \
+    C  = (C << 1) | PEEK_BITS(1);                                       \
+    REMOVE_BITS(1);                                                     \
+  }                                                                     \
+} while (0)
+
+static void qtmd_update_model(struct qtmd_model *model) {
+  struct qtmd_modelsym tmp;
+  int i, j;
+
+  if (--model->shiftsleft) {
+    for (i = model->entries - 1; i >= 0; i--) {
+      /* -1, not -2; the 0 entry saves this */
+      model->syms[i].cumfreq >>= 1;
+      if (model->syms[i].cumfreq <= model->syms[i+1].cumfreq) {
+        model->syms[i].cumfreq = model->syms[i+1].cumfreq + 1;
+      }
+    }
+  }
+  else {
+    model->shiftsleft = 50;
+    for (i = 0; i < model->entries; i++) {
+      /* no -1, want to include the 0 entry */
+      /* this converts cumfreqs into frequencies, then shifts right */
+      model->syms[i].cumfreq -= model->syms[i+1].cumfreq;
+      model->syms[i].cumfreq++; /* avoid losing things entirely */
+      model->syms[i].cumfreq >>= 1;
+    }
+
+    /* now sort by frequencies, decreasing order -- this must be an
+     * inplace selection sort, or a sort with the same (in)stability
+     * characteristics */
+    for (i = 0; i < model->entries - 1; i++) {
+      for (j = i + 1; j < model->entries; j++) {
+        if (model->syms[i].cumfreq < model->syms[j].cumfreq) {
+          tmp = model->syms[i];
+          model->syms[i] = model->syms[j];
+          model->syms[j] = tmp;
+        }
+      }
+    }
+
+    /* then convert frequencies back to cumfreq */
+    for (i = model->entries - 1; i >= 0; i--) {
+      model->syms[i].cumfreq += model->syms[i+1].cumfreq;
+    }
+  }
+}
+
+/* Initialises a model to decode symbols from [start] to [start]+[len]-1 */
+static void qtmd_init_model(struct qtmd_model *model,
+                            struct qtmd_modelsym *syms, int start, int len)
+{
+  int i;
+
+  model->shiftsleft = 4;
+  model->entries    = len;
+  model->syms       = syms;
+
+  for (i = 0; i <= len; i++) {
+    syms[i].sym     = start + i; /* actual symbol */
+    syms[i].cumfreq = len - i;   /* current frequency of that symbol */
+  }
+}
+
+
+/*-------- main Quantum code --------*/
+
+struct qtmd_stream *qtmd_init(struct mspack_system *system,
+                              struct mspack_file *input,
+                              struct mspack_file *output,
+                              int window_bits, int input_buffer_size)
+{
+  unsigned int window_size = 1 << window_bits;
+  struct qtmd_stream *qtm;
+  int i;
+
+  if (!system) return NULL;
+
+  /* Quantum supports window sizes of 2^10 (1Kb) through 2^21 (2Mb) */
+  if (window_bits < 10 || window_bits > 21) return NULL;
+
+  /* round up input buffer size to multiple of two */
+  input_buffer_size = (input_buffer_size + 1) & -2;
+  if (input_buffer_size < 2) return NULL;
+
+  /* allocate decompression state */
+  if (!(qtm = (struct qtmd_stream *) system->alloc(system, sizeof(struct qtmd_stream)))) {
+    return NULL;
+  }
+
+  /* allocate decompression window and input buffer */
+  qtm->window = (unsigned char *) system->alloc(system, (size_t) window_size);
+  qtm->inbuf  = (unsigned char *) system->alloc(system, (size_t) input_buffer_size);
+  if (!qtm->window || !qtm->inbuf) {
+    system->free(qtm->window);
+    system->free(qtm->inbuf);
+    system->free(qtm);
+    return NULL;
+  }
+
+  /* initialise decompression state */
+  qtm->sys         = system;
+  qtm->input       = input;
+  qtm->output      = output;
+  qtm->inbuf_size  = input_buffer_size;
+  qtm->window_size = window_size;
+  qtm->window_posn = 0;
+  qtm->frame_todo  = QTM_FRAME_SIZE;
+  qtm->header_read = 0;
+  qtm->error       = MSPACK_ERR_OK;
+
+  qtm->i_ptr = qtm->i_end = &qtm->inbuf[0];
+  qtm->o_ptr = qtm->o_end = &qtm->window[0];
+  qtm->input_end = 0;
+  qtm->bits_left = 0;
+  qtm->bit_buffer = 0;
+
+  /* initialise arithmetic coding models
+   * - model 4    depends on window size, ranges from 20 to 24
+   * - model 5    depends on window size, ranges from 20 to 36
+   * - model 6pos depends on window size, ranges from 20 to 42
+   */
+  i = window_bits * 2;
+  qtmd_init_model(&qtm->model0,    &qtm->m0sym[0],   0, 64);
+  qtmd_init_model(&qtm->model1,    &qtm->m1sym[0],  64, 64);
+  qtmd_init_model(&qtm->model2,    &qtm->m2sym[0], 128, 64);
+  qtmd_init_model(&qtm->model3,    &qtm->m3sym[0], 192, 64);
+  qtmd_init_model(&qtm->model4,    &qtm->m4sym[0],   0, (i > 24) ? 24 : i);
+  qtmd_init_model(&qtm->model5,    &qtm->m5sym[0],   0, (i > 36) ? 36 : i);
+  qtmd_init_model(&qtm->model6,    &qtm->m6sym[0],   0, i);
+  qtmd_init_model(&qtm->model6len, &qtm->m6lsym[0],  0, 27);
+  qtmd_init_model(&qtm->model7,    &qtm->m7sym[0],   0, 7);
+
+  /* all ok */
+  return qtm;
+}
+
+int qtmd_decompress(struct qtmd_stream *qtm, off_t out_bytes) {
+  unsigned int frame_todo, frame_end, window_posn, match_offset, range;
+  unsigned char *window, *i_ptr, *i_end, *runsrc, *rundest;
+  int i, j, selector, extra, sym, match_length;
+  unsigned short H, L, C, symf;
+
+  register unsigned int bit_buffer;
+  register unsigned char bits_left;
+
+  /* easy answers */
+  if (!qtm || (out_bytes < 0)) return MSPACK_ERR_ARGS;
+  if (qtm->error) return qtm->error;
+
+  /* flush out any stored-up bytes before we begin */
+  i = qtm->o_end - qtm->o_ptr;
+  if ((off_t) i > out_bytes) i = (int) out_bytes;
+  if (i) {
+    if (qtm->sys->write(qtm->output, qtm->o_ptr, i) != i) {
+      return qtm->error = MSPACK_ERR_WRITE;
+    }
+    qtm->o_ptr  += i;
+    out_bytes   -= i;
+  }
+  if (out_bytes == 0) return MSPACK_ERR_OK;
+
+  /* restore local state */
+  RESTORE_BITS;
+  window = qtm->window;
+  window_posn = qtm->window_posn;
+  frame_todo = qtm->frame_todo;
+  H = qtm->H;
+  L = qtm->L;
+  C = qtm->C;
+
+  /* while we do not have enough decoded bytes in reserve: */
+  while ((qtm->o_end - qtm->o_ptr) < out_bytes) {
+    /* read header if necessary. Initialises H, L and C */
+    if (!qtm->header_read) {
+      H = 0xFFFF; L = 0; READ_BITS(C, 16);
+      qtm->header_read = 1;
+    }
+
+    /* decode more, up to the number of bytes needed, the frame boundary,
+     * or the window boundary, whichever comes first */
+    frame_end = window_posn + (out_bytes - (qtm->o_end - qtm->o_ptr));
+    if ((window_posn + frame_todo) < frame_end) {
+      frame_end = window_posn + frame_todo;
+    }
+    if (frame_end > qtm->window_size) {
+      frame_end = qtm->window_size;
+    }
+
+    while (window_posn < frame_end) {
+      GET_SYMBOL(qtm->model7, selector);
+      if (selector < 4) {
+        /* literal byte */
+        struct qtmd_model *mdl = (selector == 0) ? &qtm->model0 :
+                                ((selector == 1) ? &qtm->model1 :
+                                ((selector == 2) ? &qtm->model2 :
+                                                   &qtm->model3));
+        GET_SYMBOL((*mdl), sym);
+        window[window_posn++] = sym;
+        frame_todo--;
+      }
+      else {
+        /* match repeated string */
+        switch (selector) {
+        case 4: /* selector 4 = fixed length match (3 bytes) */
+          GET_SYMBOL(qtm->model4, sym);
+          READ_MANY_BITS(extra, extra_bits[sym]);
+          match_offset = position_base[sym] + extra + 1;
+          match_length = 3;
+          break;
+
+        case 5: /* selector 5 = fixed length match (4 bytes) */
+          GET_SYMBOL(qtm->model5, sym);
+          READ_MANY_BITS(extra, extra_bits[sym]);
+          match_offset = position_base[sym] + extra + 1;
+          match_length = 4;
+          break;
+
+        case 6: /* selector 6 = variable length match */
+          GET_SYMBOL(qtm->model6len, sym);
+          READ_MANY_BITS(extra, length_extra[sym]);
+          match_length = length_base[sym] + extra + 5;
+
+          GET_SYMBOL(qtm->model6, sym);
+          READ_MANY_BITS(extra, extra_bits[sym]);
+          match_offset = position_base[sym] + extra + 1;
+          break;
+
+        default:
+          /* should be impossible, model7 can only return 0-6 */
+          D(("got %d from selector", selector))
+          return qtm->error = MSPACK_ERR_DECRUNCH;
+        }
+
+        rundest = &window[window_posn];
+        frame_todo -= match_length;
+
+        /* does match destination wrap the window? This situation is possible
+         * where the window size is less than the 32k frame size, but matches
+         * must not go beyond a frame boundary */
+        if ((window_posn + match_length) > qtm->window_size) {
+          /* copy first part of match, before window end */
+          i = qtm->window_size - window_posn;
+          j = window_posn - match_offset;
+          while (i--) *rundest++ = window[j++ & (qtm->window_size - 1)];
+
+          /* flush currently stored data */
+          i = (&window[qtm->window_size] - qtm->o_ptr);
+
+          /* this should not happen, but if it does then this code
+           * can't handle the situation (can't flush up to the end of
+           * the window, but can't break out either because we haven't
+           * finished writing the match). bail out in this case */
+          if (i > out_bytes) {
+            D(("during window-wrap match; %d bytes to flush but only need %d",
+               i, (int) out_bytes))
+            return qtm->error = MSPACK_ERR_DECRUNCH;
+          }
+          if (qtm->sys->write(qtm->output, qtm->o_ptr, i) != i) {
+            return qtm->error = MSPACK_ERR_WRITE;
+          }
+          out_bytes -= i;
+          qtm->o_ptr = &window[0];
+          qtm->o_end = &window[0]; 
+
+          /* copy second part of match, after window wrap */
+          rundest = &window[0];
+          i = match_length - (qtm->window_size - window_posn);
+          while (i--) *rundest++ = window[j++ & (qtm->window_size - 1)];
+          window_posn = window_posn + match_length - qtm->window_size;
+
+          break; /* because "window_posn < frame_end" has now failed */
+        }
+        else {
+          /* normal match - output won't wrap window or frame end */
+          i = match_length;
+
+          /* does match _offset_ wrap the window? */
+          if (match_offset > window_posn) {
+            /* j = length from match offset to end of window */
+            j = match_offset - window_posn;
+            if (j > (int) qtm->window_size) {
+              D(("match offset beyond window boundaries"))
+              return qtm->error = MSPACK_ERR_DECRUNCH;
+            }
+            runsrc = &window[qtm->window_size - j];
+            if (j < i) {
+              /* if match goes over the window edge, do two copy runs */
+              i -= j; while (j-- > 0) *rundest++ = *runsrc++;
+              runsrc = window;
+            }
+            while (i-- > 0) *rundest++ = *runsrc++;
+          }
+          else {
+            runsrc = rundest - match_offset;
+            while (i-- > 0) *rundest++ = *runsrc++;
+          }
+          window_posn += match_length;
+        }
+      } /* if (window_posn+match_length > frame_end) */
+    } /* while (window_posn < frame_end) */
+
+    qtm->o_end = &window[window_posn];
+
+   /* if we subtracted too much from frame_todo, it will
+    * wrap around past zero and go above its max value */
+   if (frame_todo > QTM_FRAME_SIZE) {
+     D(("overshot frame alignment"))
+     return qtm->error = MSPACK_ERR_DECRUNCH;
+   }
+
+    /* another frame completed? */
+    if (frame_todo == 0) {
+      /* re-align input */
+      if (bits_left & 7) REMOVE_BITS(bits_left & 7);
+
+      /* special Quantum hack -- cabd.c injects a trailer byte to allow the
+       * decompressor to realign itself. CAB Quantum blocks, unlike LZX
+       * blocks, can have anything from 0 to 4 trailing null bytes. */
+      do { READ_BITS(i, 8); } while (i != 0xFF);
+
+      qtm->header_read = 0;
+
+      frame_todo = QTM_FRAME_SIZE;
+    }
+
+    /* window wrap? */
+    if (window_posn == qtm->window_size) {
+      /* flush all currently stored data */
+      i = (qtm->o_end - qtm->o_ptr);
+      /* break out if we have more than enough to finish this request */
+      if (i >= out_bytes) break;
+      if (qtm->sys->write(qtm->output, qtm->o_ptr, i) != i) {
+        return qtm->error = MSPACK_ERR_WRITE;
+      }
+      out_bytes -= i;
+      qtm->o_ptr = &window[0];
+      qtm->o_end = &window[0]; 
+      window_posn = 0;
+   }
+
+  } /* while (more bytes needed) */
+
+  if (out_bytes) {
+    i = (int) out_bytes;
+    if (qtm->sys->write(qtm->output, qtm->o_ptr, i) != i) {
+      return qtm->error = MSPACK_ERR_WRITE;
+    }
+    qtm->o_ptr += i;
+  }
+
+  /* store local state */
+
+  STORE_BITS;
+  qtm->window_posn = window_posn;
+  qtm->frame_todo = frame_todo;
+  qtm->H = H;
+  qtm->L = L;
+  qtm->C = C;
+
+  return MSPACK_ERR_OK;
+}
+
+void qtmd_free(struct qtmd_stream *qtm) {
+  struct mspack_system *sys;
+  if (qtm) {
+    sys = qtm->sys;
+    sys->free(qtm->window);
+    sys->free(qtm->inbuf);
+    sys->free(qtm);
+  }
+}
diff --git a/utils/rbutilqt/mspack/readbits.h b/utils/rbutilqt/mspack/readbits.h
new file mode 100644
index 0000000000..9b237a3693
--- /dev/null
+++ b/utils/rbutilqt/mspack/readbits.h
@@ -0,0 +1,207 @@
+/* This file is part of libmspack.
+ * (C) 2003-2010 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_READBITS_H
+#define MSPACK_READBITS_H 1
+
+/* this header defines macros that read data streams by
+ * the individual bits
+ *
+ * INIT_BITS         initialises bitstream state in state structure
+ * STORE_BITS        stores bitstream state in state structure
+ * RESTORE_BITS      restores bitstream state from state structure
+ * ENSURE_BITS(n)    ensure there are at least N bits in the bit buffer
+ * READ_BITS(var,n)  takes N bits from the buffer and puts them in var
+ * PEEK_BITS(n)      extracts without removing N bits from the bit buffer
+ * REMOVE_BITS(n)    removes N bits from the bit buffer
+ *
+ * READ_BITS simply calls ENSURE_BITS, PEEK_BITS and REMOVE_BITS,
+ * which means it's limited to reading the number of bits you can
+ * ensure at any one time. It also fails if asked to read zero bits.
+ * If you need to read zero bits, or more bits than can be ensured in
+ * one go, use READ_MANY_BITS instead.
+ *
+ * These macros have variable names baked into them, so to use them
+ * you have to define some macros:
+ * - BITS_TYPE: the type name of your state structure
+ * - BITS_VAR: the variable that points to your state structure
+ * - define BITS_ORDER_MSB if bits are read from the MSB, or
+ *   define BITS_ORDER_LSB if bits are read from the LSB
+ * - READ_BYTES: some code that reads more data into the bit buffer,
+ *   it should use READ_IF_NEEDED (calls read_input if the byte buffer
+ *   is empty), then INJECT_BITS(data,n) to put data from the byte
+ *   buffer into the bit buffer.
+ *
+ * You also need to define some variables and structure members:
+ * - unsigned char *i_ptr;    // current position in the byte buffer
+ * - unsigned char *i_end;    // end of the byte buffer
+ * - unsigned int bit_buffer; // the bit buffer itself
+ * - unsigned int bits_left;  // number of bits remaining
+ *
+ * If you use read_input() and READ_IF_NEEDED, they also expect these
+ * structure members:
+ * - struct mspack_system *sys;  // to access sys->read()
+ * - unsigned int error;         // to record/return read errors
+ * - unsigned char input_end;    // to mark reaching the EOF
+ * - unsigned char *inbuf;       // the input byte buffer
+ * - unsigned int inbuf_size;    // the size of the input byte buffer
+ *
+ * Your READ_BYTES implementation should read data from *i_ptr and
+ * put them in the bit buffer. READ_IF_NEEDED will call read_input()
+ * if i_ptr reaches i_end, and will fill up inbuf and set i_ptr to
+ * the start of inbuf and i_end to the end of inbuf.
+ *
+ * If you're reading in MSB order, the routines work by using the area
+ * beyond the MSB and the LSB of the bit buffer as a free source of
+ * zeroes when shifting. This avoids having to mask any bits. So we
+ * have to know the bit width of the bit buffer variable. We use
+ * <limits.h> and CHAR_BIT to find the size of the bit buffer in bits.
+ *
+ * If you are reading in LSB order, bits need to be masked. Normally
+ * this is done by computing the mask: N bits are masked by the value
+ * (1<<N)-1). However, you can define BITS_LSB_TABLE to use a lookup
+ * table instead of computing this. This adds two new macros,
+ * PEEK_BITS_T and READ_BITS_T which work the same way as PEEK_BITS
+ * and READ_BITS, except they use this lookup table. This is useful if
+ * you need to look up a number of bits that are only known at
+ * runtime, so the bit mask can't be turned into a constant by the
+ * compiler.
+
+ * The bit buffer datatype should be at least 32 bits wide: it must be
+ * possible to ENSURE_BITS(17), so it must be possible to add 16 new bits
+ * to the bit buffer when the bit buffer already has 1 to 15 bits left.
+ */
+
+#ifndef BITS_VAR
+# error "define BITS_VAR as the state structure poiner variable name"
+#endif
+#ifndef BITS_TYPE
+# error "define BITS_TYPE as the state structure type"
+#endif
+#if defined(BITS_ORDER_MSB) && defined(BITS_ORDER_LSB)
+# error "you must define either BITS_ORDER_MSB or BITS_ORDER_LSB"
+#else
+# if !(defined(BITS_ORDER_MSB) || defined(BITS_ORDER_LSB))
+#  error "you must define BITS_ORDER_MSB or BITS_ORDER_LSB"
+# endif
+#endif
+
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+#ifndef CHAR_BIT
+# define CHAR_BIT (8)
+#endif
+#define BITBUF_WIDTH (sizeof(bit_buffer) * CHAR_BIT)
+
+#define INIT_BITS do {                          \
+    BITS_VAR->i_ptr      = &BITS_VAR->inbuf[0]; \
+    BITS_VAR->i_end      = &BITS_VAR->inbuf[0]; \
+    BITS_VAR->bit_buffer = 0;                   \
+    BITS_VAR->bits_left  = 0;                   \
+    BITS_VAR->input_end  = 0;                   \
+} while (0)
+
+#define STORE_BITS do {                 \
+    BITS_VAR->i_ptr      = i_ptr;       \
+    BITS_VAR->i_end      = i_end;       \
+    BITS_VAR->bit_buffer = bit_buffer;  \
+    BITS_VAR->bits_left  = bits_left;   \
+} while (0)
+
+#define RESTORE_BITS do {               \
+    i_ptr      = BITS_VAR->i_ptr;       \
+    i_end      = BITS_VAR->i_end;       \
+    bit_buffer = BITS_VAR->bit_buffer;  \
+    bits_left  = BITS_VAR->bits_left;   \
+} while (0)
+
+#define ENSURE_BITS(nbits) do {                 \
+    while (bits_left < (nbits)) READ_BYTES;     \
+} while (0)
+
+#define READ_BITS(val, nbits) do {              \
+    ENSURE_BITS(nbits);                         \
+    (val) = PEEK_BITS(nbits);                   \
+    REMOVE_BITS(nbits);                         \
+} while (0)
+
+#define READ_MANY_BITS(val, bits) do {                          \
+    unsigned char needed = (bits), bitrun;                      \
+    (val) = 0;                                                  \
+    while (needed > 0) {                                        \
+        if (bits_left <= (BITBUF_WIDTH - 16)) READ_BYTES;       \
+        bitrun = (bits_left < needed) ? bits_left : needed;     \
+        (val) = ((val) << bitrun) | PEEK_BITS(bitrun);          \
+        REMOVE_BITS(bitrun);                                    \
+        needed -= bitrun;                                       \
+    }                                                           \
+} while (0)
+
+#ifdef BITS_ORDER_MSB
+# define PEEK_BITS(nbits)   (bit_buffer >> (BITBUF_WIDTH - (nbits)))
+# define REMOVE_BITS(nbits) ((bit_buffer <<= (nbits)), (bits_left -= (nbits)))
+# define INJECT_BITS(bitdata,nbits) ((bit_buffer |= \
+    (bitdata) << (BITBUF_WIDTH - (nbits) - bits_left)), (bits_left += (nbits)))
+#else /* BITS_ORDER_LSB */
+# define PEEK_BITS(nbits)   (bit_buffer & ((1 << (nbits))-1))
+# define REMOVE_BITS(nbits) ((bit_buffer >>= (nbits)), (bits_left -= (nbits)))
+# define INJECT_BITS(bitdata,nbits) ((bit_buffer |= \
+    (bitdata) << bits_left), (bits_left += (nbits)))
+#endif
+
+#ifdef BITS_LSB_TABLE
+/* lsb_bit_mask[n] = (1 << n) - 1 */
+static const unsigned short lsb_bit_mask[17] = {
+    0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
+    0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
+};
+# define PEEK_BITS_T(nbits) (bit_buffer & lsb_bit_mask[(nbits)])
+# define READ_BITS_T(val, nbits) do {   \
+    ENSURE_BITS(nbits);                 \
+    (val) = PEEK_BITS_T(nbits);         \
+    REMOVE_BITS(nbits);                 \
+} while (0)
+#endif
+
+#ifndef BITS_NO_READ_INPUT
+# define READ_IF_NEEDED do {            \
+    if (i_ptr >= i_end) {               \
+        if (read_input(BITS_VAR))       \
+            return BITS_VAR->error;     \
+        i_ptr = BITS_VAR->i_ptr;        \
+        i_end = BITS_VAR->i_end;        \
+    }                                   \
+} while (0)
+
+static int read_input(BITS_TYPE *p) {
+    int read = p->sys->read(p->input, &p->inbuf[0], (int)p->inbuf_size);
+    if (read < 0) return p->error = MSPACK_ERR_READ;
+
+    /* we might overrun the input stream by asking for bits we don't use,
+     * so fake 2 more bytes at the end of input */
+    if (read == 0) {
+        if (p->input_end) {
+            D(("out of input bytes"))
+            return p->error = MSPACK_ERR_READ;
+        }
+        else {
+            read = 2;
+            p->inbuf[0] = p->inbuf[1] = 0;
+            p->input_end = 1;
+        }
+    }
+
+    /* update i_ptr and i_end */
+    p->i_ptr = &p->inbuf[0];
+    p->i_end = &p->inbuf[read];
+    return MSPACK_ERR_OK;
+}
+#endif
+#endif
diff --git a/utils/rbutilqt/mspack/readhuff.h b/utils/rbutilqt/mspack/readhuff.h
new file mode 100644
index 0000000000..4d94225789
--- /dev/null
+++ b/utils/rbutilqt/mspack/readhuff.h
@@ -0,0 +1,172 @@
+/* This file is part of libmspack.
+ * (C) 2003-2014 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_READHUFF_H
+#define MSPACK_READHUFF_H 1
+
+/* This implements a fast Huffman tree decoding system. */
+
+#if !(defined(BITS_ORDER_MSB) || defined(BITS_ORDER_LSB))
+# error "readhuff.h is used in conjunction with readbits.h, include that first"
+#endif
+#if !(defined(TABLEBITS) && defined(MAXSYMBOLS))
+# error "define TABLEBITS(tbl) and MAXSYMBOLS(tbl) before using readhuff.h"
+#endif
+#if !(defined(HUFF_TABLE) && defined(HUFF_LEN))
+# error "define HUFF_TABLE(tbl) and HUFF_LEN(tbl) before using readhuff.h"
+#endif
+#ifndef HUFF_ERROR
+# error "define HUFF_ERROR before using readhuff.h"
+#endif
+#ifndef HUFF_MAXBITS
+# define HUFF_MAXBITS 16
+#endif
+
+/* Decodes the next huffman symbol from the input bitstream into var.
+ * Do not use this macro on a table unless build_decode_table() succeeded.
+ */
+#define READ_HUFFSYM(tbl, var) do {                     \
+    ENSURE_BITS(HUFF_MAXBITS);                          \
+    sym = HUFF_TABLE(tbl, PEEK_BITS(TABLEBITS(tbl)));   \
+    if (sym >= MAXSYMBOLS(tbl)) HUFF_TRAVERSE(tbl);     \
+    (var) = sym;                                        \
+    i = HUFF_LEN(tbl, sym);                             \
+    REMOVE_BITS(i);                                     \
+} while (0)
+
+#ifdef BITS_ORDER_LSB
+# define HUFF_TRAVERSE(tbl) do {                        \
+    i = TABLEBITS(tbl) - 1;                             \
+    do {                                                \
+        if (i++ > HUFF_MAXBITS) HUFF_ERROR;             \
+        sym = HUFF_TABLE(tbl,                           \
+            (sym << 1) | ((bit_buffer >> i) & 1));      \
+    } while (sym >= MAXSYMBOLS(tbl));                   \
+} while (0)
+#else
+#define HUFF_TRAVERSE(tbl) do {                         \
+    i = 1 << (BITBUF_WIDTH - TABLEBITS(tbl));           \
+    do {                                                \
+        if ((i >>= 1) == 0) HUFF_ERROR;                 \
+        sym = HUFF_TABLE(tbl,                           \
+            (sym << 1) | ((bit_buffer & i) ? 1 : 0));   \
+    } while (sym >= MAXSYMBOLS(tbl));                   \
+} while (0)
+#endif
+
+/* make_decode_table(nsyms, nbits, length[], table[])
+ *
+ * This function was originally coded by David Tritscher.
+ * It builds a fast huffman decoding table from
+ * a canonical huffman code lengths table.
+ *
+ * nsyms  = total number of symbols in this huffman tree.
+ * nbits  = any symbols with a code length of nbits or less can be decoded
+ *          in one lookup of the table.
+ * length = A table to get code lengths from [0 to nsyms-1]
+ * table  = The table to fill up with decoded symbols and pointers.
+ *          Should be ((1<<nbits) + (nsyms*2)) in length.
+ *
+ * Returns 0 for OK or 1 for error
+ */
+static int make_decode_table(unsigned int nsyms, unsigned int nbits,
+                             unsigned char *length, unsigned short *table)
+{
+    register unsigned short sym, next_symbol;
+    register unsigned int leaf, fill;
+#ifdef BITS_ORDER_LSB
+    register unsigned int reverse;
+#endif
+    register unsigned char bit_num;
+    unsigned int pos         = 0; /* the current position in the decode table */
+    unsigned int table_mask  = 1 << nbits;
+    unsigned int bit_mask    = table_mask >> 1; /* don't do 0 length codes */
+
+    /* fill entries for codes short enough for a direct mapping */
+    for (bit_num = 1; bit_num <= nbits; bit_num++) {
+        for (sym = 0; sym < nsyms; sym++) {
+            if (length[sym] != bit_num) continue;
+#ifdef BITS_ORDER_MSB
+            leaf = pos;
+#else
+            /* reverse the significant bits */
+            fill = length[sym]; reverse = pos >> (nbits - fill); leaf = 0;
+            do {leaf <<= 1; leaf |= reverse & 1; reverse >>= 1;} while (--fill);
+#endif
+
+            if((pos += bit_mask) > table_mask) return 1; /* table overrun */
+
+            /* fill all possible lookups of this symbol with the symbol itself */
+#ifdef BITS_ORDER_MSB
+            for (fill = bit_mask; fill-- > 0;) table[leaf++] = sym;
+#else
+            fill = bit_mask; next_symbol = 1 << bit_num;
+            do { table[leaf] = sym; leaf += next_symbol; } while (--fill);
+#endif
+        }
+        bit_mask >>= 1;
+    }
+
+    /* exit with success if table is now complete */
+    if (pos == table_mask) return 0;
+
+    /* mark all remaining table entries as unused */
+    for (sym = pos; sym < table_mask; sym++) {
+#ifdef BITS_ORDER_MSB
+        table[sym] = 0xFFFF;
+#else
+        reverse = sym; leaf = 0; fill = nbits;
+        do { leaf <<= 1; leaf |= reverse & 1; reverse >>= 1; } while (--fill);
+        table[leaf] = 0xFFFF;
+#endif
+    }
+
+    /* next_symbol = base of allocation for long codes */
+    next_symbol = ((table_mask >> 1) < nsyms) ? nsyms : (table_mask >> 1);
+
+    /* give ourselves room for codes to grow by up to 16 more bits.
+     * codes now start at bit nbits+16 and end at (nbits+16-codelength) */
+    pos <<= 16;
+    table_mask <<= 16;
+    bit_mask = 1 << 15;
+
+    for (bit_num = nbits+1; bit_num <= HUFF_MAXBITS; bit_num++) {
+        for (sym = 0; sym < nsyms; sym++) {
+            if (length[sym] != bit_num) continue;
+            if (pos >= table_mask) return 1; /* table overflow */
+
+#ifdef BITS_ORDER_MSB
+            leaf = pos >> 16;
+#else
+            /* leaf = the first nbits of the code, reversed */
+            reverse = pos >> 16; leaf = 0; fill = nbits;
+            do {leaf <<= 1; leaf |= reverse & 1; reverse >>= 1;} while (--fill);
+#endif
+            for (fill = 0; fill < (bit_num - nbits); fill++) {
+                /* if this path hasn't been taken yet, 'allocate' two entries */
+                if (table[leaf] == 0xFFFF) {
+                    table[(next_symbol << 1)     ] = 0xFFFF;
+                    table[(next_symbol << 1) + 1 ] = 0xFFFF;
+                    table[leaf] = next_symbol++;
+                }
+
+                /* follow the path and select either left or right for next bit */
+                leaf = table[leaf] << 1;
+                if ((pos >> (15-fill)) & 1) leaf++;
+            }
+            table[leaf] = sym;
+            pos += bit_mask;
+        }
+        bit_mask >>= 1;
+    }
+
+    /* full table? */
+    return (pos == table_mask) ? 0 : 1;
+}
+#endif
diff --git a/utils/rbutilqt/mspack/sha.h b/utils/rbutilqt/mspack/sha.h
new file mode 100644
index 0000000000..360521519b
--- /dev/null
+++ b/utils/rbutilqt/mspack/sha.h
@@ -0,0 +1,15 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_LZSS_H
+#define MSPACK_LZSS_H 1
+
+/* SHA-1 message digest definitions */
+
+#endif
diff --git a/utils/rbutilqt/mspack/system-mspack.c b/utils/rbutilqt/mspack/system-mspack.c
new file mode 100644
index 0000000000..9d4886a8db
--- /dev/null
+++ b/utils/rbutilqt/mspack/system-mspack.c
@@ -0,0 +1,240 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "system-mspack.h"
+
+#ifndef LARGEFILE_SUPPORT
+const char *largefile_msg = "library not compiled to support large files.";
+#endif
+
+
+int mspack_version(int entity) {
+  switch (entity) {
+   /* CHM decoder version 1 -> 2 changes:
+    * - added mschmd_sec_mscompressed::spaninfo
+    * - added mschmd_header::first_pmgl
+    * - added mschmd_header::last_pmgl
+    * - added mschmd_header::chunk_cache;
+    */
+  case MSPACK_VER_MSCHMD:
+    return 2;
+  case MSPACK_VER_LIBRARY:
+  case MSPACK_VER_SYSTEM:
+  case MSPACK_VER_MSCABD:
+  case MSPACK_VER_MSSZDDD:
+  case MSPACK_VER_MSKWAJD:
+    return 1;
+  case MSPACK_VER_MSCABC:
+  case MSPACK_VER_MSCHMC:
+  case MSPACK_VER_MSLITD:
+  case MSPACK_VER_MSLITC:
+  case MSPACK_VER_MSHLPD:
+  case MSPACK_VER_MSHLPC:
+  case MSPACK_VER_MSSZDDC:
+  case MSPACK_VER_MSKWAJC:
+    return 0;
+  }
+  return -1;
+}
+
+int mspack_sys_selftest_internal(int offt_size) {
+  return (sizeof(off_t) == offt_size) ? MSPACK_ERR_OK : MSPACK_ERR_SEEK;
+}
+
+/* validates a system structure */
+int mspack_valid_system(struct mspack_system *sys) {
+  return (sys != NULL) && (sys->open != NULL) && (sys->close != NULL) &&
+    (sys->read != NULL) && (sys->write != NULL) && (sys->seek != NULL) &&
+    (sys->tell != NULL) && (sys->message != NULL) && (sys->alloc != NULL) &&
+    (sys->free != NULL) && (sys->copy != NULL) && (sys->null_ptr == NULL);
+}
+
+/* returns the length of a file opened for reading */
+int mspack_sys_filelen(struct mspack_system *system,
+                       struct mspack_file *file, off_t *length)
+{
+  off_t current;
+
+  if (!system || !file || !length) return MSPACK_ERR_OPEN;
+
+  /* get current offset */
+  current = system->tell(file);
+
+  /* seek to end of file */
+  if (system->seek(file, (off_t) 0, MSPACK_SYS_SEEK_END)) {
+    return MSPACK_ERR_SEEK;
+  }
+
+  /* get offset of end of file */
+  *length = system->tell(file);
+
+  /* seek back to original offset */
+  if (system->seek(file, current, MSPACK_SYS_SEEK_START)) {
+    return MSPACK_ERR_SEEK;
+  }
+
+  return MSPACK_ERR_OK;
+}
+
+
+
+/* definition of mspack_default_system -- if the library is compiled with
+ * MSPACK_NO_DEFAULT_SYSTEM, no default system will be provided. Otherwise,
+ * an appropriate default system (e.g. the standard C library, or some native
+ * API calls)
+ */
+
+#ifdef MSPACK_NO_DEFAULT_SYSTEM
+struct mspack_system *mspack_default_system = NULL;
+#else
+
+/* implementation of mspack_default_system for standard C library */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+struct mspack_file_p {
+  FILE *fh;
+  const char *name;
+};
+
+static struct mspack_file *msp_open(struct mspack_system *self,
+                                    const char *filename, int mode)
+{
+  struct mspack_file_p *fh;
+  const char *fmode;
+  (void)self;
+
+  switch (mode) {
+  case MSPACK_SYS_OPEN_READ:   fmode = "rb";  break;
+  case MSPACK_SYS_OPEN_WRITE:  fmode = "wb";  break;
+  case MSPACK_SYS_OPEN_UPDATE: fmode = "r+b"; break;
+  case MSPACK_SYS_OPEN_APPEND: fmode = "ab";  break;
+  default: return NULL;
+  }
+
+  if ((fh = (struct mspack_file_p *) malloc(sizeof(struct mspack_file_p)))) {
+    fh->name = filename;
+    if ((fh->fh = fopen(filename, fmode))) return (struct mspack_file *) fh;
+    free(fh);
+  }
+  return NULL;
+}
+
+static void msp_close(struct mspack_file *file) {
+  struct mspack_file_p *self = (struct mspack_file_p *) file;
+  if (self) {
+    fclose(self->fh);
+    free(self);
+  }
+}
+
+static int msp_read(struct mspack_file *file, void *buffer, int bytes) {
+  struct mspack_file_p *self = (struct mspack_file_p *) file;
+  if (self && buffer && bytes >= 0) {
+    size_t count = fread(buffer, 1, (size_t) bytes, self->fh);
+    if (!ferror(self->fh)) return (int) count;
+  }
+  return -1;
+}
+
+static int msp_write(struct mspack_file *file, void *buffer, int bytes) {
+  struct mspack_file_p *self = (struct mspack_file_p *) file;
+  if (self && buffer && bytes >= 0) {
+    size_t count = fwrite(buffer, 1, (size_t) bytes, self->fh);
+    if (!ferror(self->fh)) return (int) count;
+  }
+  return -1;
+}
+
+static int msp_seek(struct mspack_file *file, off_t offset, int mode) {
+  struct mspack_file_p *self = (struct mspack_file_p *) file;
+  if (self) {
+    switch (mode) {
+    case MSPACK_SYS_SEEK_START: mode = SEEK_SET; break;
+    case MSPACK_SYS_SEEK_CUR:   mode = SEEK_CUR; break;
+    case MSPACK_SYS_SEEK_END:   mode = SEEK_END; break;
+    default: return -1;
+    }
+#ifdef HAVE_FSEEKO
+    return fseeko(self->fh, offset, mode);
+#else
+    return fseek(self->fh, offset, mode);
+#endif
+  }
+  return -1;
+}
+
+static off_t msp_tell(struct mspack_file *file) {
+  struct mspack_file_p *self = (struct mspack_file_p *) file;
+#ifdef HAVE_FSEEKO
+  return (self) ? (off_t) ftello(self->fh) : 0;
+#else
+  return (self) ? (off_t) ftell(self->fh) : 0;
+#endif
+}
+
+static void msp_msg(struct mspack_file *file, const char *format, ...) {
+  va_list ap;
+  if (file) fprintf(stderr, "%s: ", ((struct mspack_file_p *) file)->name);
+  va_start(ap, format);
+  vfprintf(stderr, format, ap);
+  va_end(ap);
+  fputc((int) '\n', stderr);
+  fflush(stderr);
+}
+
+static void *msp_alloc(struct mspack_system *self, size_t bytes) {
+#ifdef DEBUG
+  /* make uninitialised data obvious */
+  char *buf = malloc(bytes + 8);
+  (void)self;
+  if (buf) memset(buf, 0xDC, bytes);
+  *((size_t *)buf) = bytes;
+  return &buf[8];
+#else
+  (void)self;
+  return malloc(bytes);
+#endif
+}
+
+static void msp_free(void *buffer) {
+#ifdef DEBUG
+  char *buf = buffer;
+  size_t bytes;
+  if (buf) {
+    buf -= 8;
+    bytes = *((size_t *)buf);
+    /* make freed data obvious */
+    memset(buf, 0xED, bytes);
+    free(buf);
+  }
+#else
+  free(buffer);
+#endif
+}
+
+static void msp_copy(void *src, void *dest, size_t bytes) {
+  memcpy(dest, src, bytes);
+}
+
+static struct mspack_system msp_system = {
+  &msp_open, &msp_close, &msp_read,  &msp_write, &msp_seek,
+  &msp_tell, &msp_msg, &msp_alloc, &msp_free, &msp_copy, NULL
+};
+
+struct mspack_system *mspack_default_system = &msp_system;
+
+#endif
diff --git a/utils/rbutilqt/mspack/system-mspack.h b/utils/rbutilqt/mspack/system-mspack.h
new file mode 100644
index 0000000000..a0e6cf3ca8
--- /dev/null
+++ b/utils/rbutilqt/mspack/system-mspack.h
@@ -0,0 +1,129 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_SYSTEM_H
+#define MSPACK_SYSTEM_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ensure config.h is read before mspack.h */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "mspack.h"
+
+/* fix for problem with GCC 4 and glibc (thanks to Ville Skytta)
+ * http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150429
+ */
+#ifdef read
+# undef read
+#endif
+
+#ifdef DEBUG
+# include <stdio.h>
+/* Old GCCs don't have __func__, but __FUNCTION__:
+ * http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html
+ */
+# if __STDC_VERSION__ < 199901L
+#  if __GNUC__ >= 2
+#   define __func__ __FUNCTION__
+#  else
+#   define __func__ "<unknown>"
+#  endif
+# endif
+# define D(x) do { printf("%s:%d (%s) ",__FILE__, __LINE__, __func__); \
+                   printf x ; fputc('\n', stdout); fflush(stdout);} while (0);
+#else
+# define D(x)
+#endif
+
+/* CAB supports searching through files over 4GB in size, and the CHM file
+ * format actively uses 64-bit offsets. These can only be fully supported
+ * if the system the code runs on supports large files. If not, the library
+ * will work as normal using only 32-bit arithmetic, but if an offset
+ * greater than 2GB is detected, an error message indicating the library
+ * can't support the file should be printed.
+ */
+#ifdef HAVE_LIMITS_H
+# include <limits.h>
+#endif
+
+#if ((defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS >= 64) || \
+     (defined(FILESIZEBITS)      && FILESIZEBITS      >= 64) || \
+     (defined(SIZEOF_OFF_T)      && SIZEOF_OFF_T      >= 8)  || \
+     defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE))
+# define LARGEFILE_SUPPORT 1
+# define LD "lld"
+# define LU "llu"
+#else
+extern const char *largefile_msg;
+# define LD "ld"
+# define LU "lu"
+#endif
+
+/* endian-neutral reading of little-endian data */
+#define __egi32(a,n) ( ((((unsigned char *) a)[n+3]) << 24) | \
+                       ((((unsigned char *) a)[n+2]) << 16) | \
+                       ((((unsigned char *) a)[n+1]) <<  8) | \
+                       ((((unsigned char *) a)[n+0])))
+#define EndGetI64(a) ((((unsigned long long int) __egi32(a,4)) << 32) | \
+                      ((unsigned int) __egi32(a,0)))
+#define EndGetI32(a) __egi32(a,0)
+#define EndGetI16(a) ((((a)[1])<<8)|((a)[0]))
+
+/* endian-neutral reading of big-endian data */
+#define EndGetM32(a) (((((unsigned char *) a)[0]) << 24) | \
+                      ((((unsigned char *) a)[1]) << 16) | \
+                      ((((unsigned char *) a)[2]) <<  8) | \
+                      ((((unsigned char *) a)[3])))
+#define EndGetM16(a) ((((a)[0])<<8)|((a)[1]))
+
+extern struct mspack_system *mspack_default_system;
+
+/* returns the length of a file opened for reading */
+extern int mspack_sys_filelen(struct mspack_system *system,
+                              struct mspack_file *file, off_t *length);
+
+/* validates a system structure */
+extern int mspack_valid_system(struct mspack_system *sys);
+
+#if HAVE_STRINGS_H
+# include <strings.h>
+#endif
+
+#if HAVE_STRING_H
+# include <string.h>
+#endif
+
+#if HAVE_MEMCMP
+# define mspack_memcmp memcmp
+#else
+/* inline memcmp() */
+#ifdef _MSC_VER /* MSVC requires use of __inline instead of inline */
+#define INLINE __inline
+#else
+#define INLINE inline
+#endif
+static INLINE int mspack_memcmp(const void *s1, const void *s2, size_t n) {
+  unsigned char *c1 = (unsigned char *) s1;
+  unsigned char *c2 = (unsigned char *) s2;
+  if (n == 0) return 0;
+  while (--n && (*c1 == *c2)) c1++, c2++;
+  return *c1 - *c2;
+}
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/utils/rbutilqt/mspack/szdd.h b/utils/rbutilqt/mspack/szdd.h
new file mode 100644
index 0000000000..b9936b42d1
--- /dev/null
+++ b/utils/rbutilqt/mspack/szdd.h
@@ -0,0 +1,39 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+#ifndef MSPACK_SZDD_H
+#define MSPACK_SZDD_H 1
+
+#include "lzss.h"
+
+/* input buffer size during decompression - not worth parameterising IMHO */
+#define SZDD_INPUT_SIZE (2048)
+
+/* SZDD compression definitions */
+
+struct msszdd_compressor_p {
+  struct msszdd_compressor base;
+  struct mspack_system *system;
+  int error;
+};
+
+/* SZDD decompression definitions */
+
+struct msszdd_decompressor_p {
+  struct msszdd_decompressor base;
+  struct mspack_system *system;
+  int error;
+};
+
+struct msszddd_header_p {
+  struct msszddd_header base;
+  struct mspack_file *fh;
+};
+
+#endif
diff --git a/utils/rbutilqt/mspack/szddc.c b/utils/rbutilqt/mspack/szddc.c
new file mode 100644
index 0000000000..6ad6501217
--- /dev/null
+++ b/utils/rbutilqt/mspack/szddc.c
@@ -0,0 +1,24 @@
+/* This file is part of libmspack.
+ * (C) 2003-2004 Stuart Caie.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* SZDD compression implementation */
+
+#include "system-mspack.h"
+#include "szdd.h"
+
+struct msszdd_compressor *
+  mspack_create_szdd_compressor(struct mspack_system *sys)
+{
+  /* todo */
+  return NULL;
+}
+
+void mspack_destroy_szdd_compressor(struct msszdd_compressor *self) {
+  /* todo */
+}
diff --git a/utils/rbutilqt/mspack/szddd.c b/utils/rbutilqt/mspack/szddd.c
new file mode 100644
index 0000000000..1d6d05f844
--- /dev/null
+++ b/utils/rbutilqt/mspack/szddd.c
@@ -0,0 +1,247 @@
+/* This file is part of libmspack.
+ * (C) 2003-2010 Stuart Caie.
+ *
+ * SZDD is a format used in the MS-DOS commands COMPRESS.EXE and
+ * EXPAND.EXE. The compression method is attributed to Steven Zeck,
+ * however it's pretty much identical to LZSS.
+ *
+ * libmspack is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License (LGPL) version 2.1
+ *
+ * For further details, see the file COPYING.LIB distributed with libmspack
+ */
+
+/* SZDD decompression implementation */
+
+#include "system-mspack.h"
+#include "szdd.h"
+
+/* prototypes */
+static struct msszddd_header *szddd_open(
+    struct msszdd_decompressor *base, const char *filename);
+static void szddd_close(
+    struct msszdd_decompressor *base, struct msszddd_header *hdr);
+static int szddd_read_headers(
+    struct mspack_system *sys, struct mspack_file *fh,
+    struct msszddd_header *hdr);
+static int szddd_extract(
+    struct msszdd_decompressor *base, struct msszddd_header *hdr,
+    const char *filename);
+static int szddd_decompress(
+    struct msszdd_decompressor *base, const char *input, const char *output);
+static int szddd_error(
+    struct msszdd_decompressor *base);
+
+/***************************************
+ * MSPACK_CREATE_SZDD_DECOMPRESSOR
+ ***************************************
+ * constructor
+ */
+struct msszdd_decompressor *
+    mspack_create_szdd_decompressor(struct mspack_system *sys)
+{
+  struct msszdd_decompressor_p *self = NULL;
+
+  if (!sys) sys = mspack_default_system;
+  if (!mspack_valid_system(sys)) return NULL;
+
+  if ((self = (struct msszdd_decompressor_p *) sys->alloc(sys, sizeof(struct msszdd_decompressor_p)))) {
+    self->base.open       = &szddd_open;
+    self->base.close      = &szddd_close;
+    self->base.extract    = &szddd_extract;
+    self->base.decompress = &szddd_decompress;
+    self->base.last_error = &szddd_error;
+    self->system          = sys;
+    self->error           = MSPACK_ERR_OK;
+  }
+  return (struct msszdd_decompressor *) self;
+}
+
+/***************************************
+ * MSPACK_DESTROY_SZDD_DECOMPRESSOR
+ ***************************************
+ * destructor
+ */
+void mspack_destroy_szdd_decompressor(struct msszdd_decompressor *base)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    if (self) {
+        struct mspack_system *sys = self->system;
+        sys->free(self);
+    }
+}
+
+/***************************************
+ * SZDDD_OPEN
+ ***************************************
+ * opens an SZDD file without decompressing, reads header
+ */
+static struct msszddd_header *szddd_open(struct msszdd_decompressor *base,
+                                         const char *filename)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    struct msszddd_header *hdr;
+    struct mspack_system *sys;
+    struct mspack_file *fh;
+
+    if (!self) return NULL;
+    sys = self->system;
+
+    fh  = sys->open(sys, filename, MSPACK_SYS_OPEN_READ);
+    hdr = (struct msszddd_header *) sys->alloc(sys, sizeof(struct msszddd_header_p));
+    if (fh && hdr) {
+        ((struct msszddd_header_p *) hdr)->fh = fh;
+        self->error = szddd_read_headers(sys, fh, hdr);
+    }
+    else {
+        if (!fh)  self->error = MSPACK_ERR_OPEN;
+        if (!hdr) self->error = MSPACK_ERR_NOMEMORY;
+    }
+    
+    if (self->error) {
+        if (fh) sys->close(fh);
+        sys->free(hdr);
+        hdr = NULL;
+    }
+
+    return hdr;
+}
+
+/***************************************
+ * SZDDD_CLOSE
+ ***************************************
+ * closes an SZDD file
+ */
+static void szddd_close(struct msszdd_decompressor *base,
+                        struct msszddd_header *hdr)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    struct msszddd_header_p *hdr_p = (struct msszddd_header_p *) hdr;
+
+    if (!self || !self->system) return;
+
+    /* close the file handle associated */
+    self->system->close(hdr_p->fh);
+
+    /* free the memory associated */
+    self->system->free(hdr);
+
+    self->error = MSPACK_ERR_OK;
+}
+
+/***************************************
+ * SZDDD_READ_HEADERS
+ ***************************************
+ * reads the headers of an SZDD format file
+ */
+static unsigned char szdd_signature_expand[8] = {
+    0x53, 0x5A, 0x44, 0x44, 0x88, 0xF0, 0x27, 0x33
+};
+static unsigned char szdd_signature_qbasic[8] = {
+    0x53, 0x5A, 0x20, 0x88, 0xF0, 0x27, 0x33, 0xD1
+};
+
+static int szddd_read_headers(struct mspack_system *sys,
+                              struct mspack_file *fh,
+                              struct msszddd_header *hdr)
+{
+    unsigned char buf[8];
+
+    /* read and check signature */
+    if (sys->read(fh, buf, 8) != 8) return MSPACK_ERR_READ;
+
+    if ((memcmp(buf, szdd_signature_expand, 8) == 0)) {
+        /* common SZDD */
+        hdr->format = MSSZDD_FMT_NORMAL;
+
+        /* read the rest of the header */
+        if (sys->read(fh, buf, 6) != 6) return MSPACK_ERR_READ;
+        if (buf[0] != 0x41) return MSPACK_ERR_DATAFORMAT;
+        hdr->missing_char = buf[1];
+        hdr->length = EndGetI32(&buf[2]);
+    }
+    else if ((memcmp(buf, szdd_signature_qbasic, 8) == 0)) {
+        /* special QBasic SZDD */
+        hdr->format = MSSZDD_FMT_QBASIC;
+        if (sys->read(fh, buf, 4) != 4) return MSPACK_ERR_READ;
+        hdr->missing_char = '\0';
+        hdr->length = EndGetI32(buf);
+    }
+    else {
+        return MSPACK_ERR_SIGNATURE;
+    }
+    return MSPACK_ERR_OK;
+}
+
+/***************************************
+ * SZDDD_EXTRACT
+ ***************************************
+ * decompresses an SZDD file
+ */
+static int szddd_extract(struct msszdd_decompressor *base,
+                         struct msszddd_header *hdr, const char *filename)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    struct mspack_file *fh, *outfh;
+    struct mspack_system *sys;
+    off_t data_offset;
+
+    if (!self) return MSPACK_ERR_ARGS;
+    if (!hdr)  return self->error = MSPACK_ERR_ARGS;
+    sys = self->system;
+
+    fh = ((struct msszddd_header_p *) hdr)->fh;
+
+    /* seek to the compressed data */
+    data_offset = (hdr->format == MSSZDD_FMT_NORMAL) ? 14 : 12;
+    if (sys->seek(fh, data_offset, MSPACK_SYS_SEEK_START)) {
+        return self->error = MSPACK_ERR_SEEK;
+    }
+
+    /* open file for output */
+    if (!(outfh = sys->open(sys, filename, MSPACK_SYS_OPEN_WRITE))) {
+        return self->error = MSPACK_ERR_OPEN;
+    }
+
+    /* decompress the data */
+    self->error = lzss_decompress(sys, fh, outfh, SZDD_INPUT_SIZE,
+                                  hdr->format == MSSZDD_FMT_NORMAL
+                                  ? LZSS_MODE_EXPAND
+                                  : LZSS_MODE_QBASIC);
+
+    /* close output file */
+    sys->close(outfh);
+
+    return self->error;
+}
+
+/***************************************
+ * SZDDD_DECOMPRESS
+ ***************************************
+ * unpacks directly from input to output
+ */
+static int szddd_decompress(struct msszdd_decompressor *base,
+                            const char *input, const char *output)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    struct msszddd_header *hdr;
+    int error;
+
+    if (!self) return MSPACK_ERR_ARGS;
+
+    if (!(hdr = szddd_open(base, input))) return self->error;
+    error = szddd_extract(base, hdr, output);
+    szddd_close(base, hdr);
+    return self->error = error;
+}
+
+/***************************************
+ * SZDDD_ERROR
+ ***************************************
+ * returns the last error that occurred
+ */
+static int szddd_error(struct msszdd_decompressor *base)
+{
+    struct msszdd_decompressor_p *self = (struct msszdd_decompressor_p *) base;
+    return (self) ? self->error : MSPACK_ERR_ARGS;
+}