Rewrite filesystem code (WIP)

This patch redoes the filesystem code from the FAT driver up to the
clipboard code in onplay.c.

Not every aspect of this is finished therefore it is still "WIP". I
don't wish to do too much at once (haha!). What is left to do is get
dircache back in the sim and find an implementation for the dircache
indicies in the tagcache and playlist code or do something else that
has the same benefit. Leaving these out for now does not make anything
unusable. All the basics are done.

Phone app code should probably get vetted (and app path handling
just plain rewritten as environment expansions); the SDL app and
Android run well.

Main things addressed:
1) Thread safety: There is none right now in the trunk code. Most of
what currently works is luck when multiple threads are involved or
multiple descriptors to the same file are open.

2) POSIX compliance: Many of the functions behave nothing like their
counterparts on a host system. This leads to inconsistent code or very
different behavior from native to hosted. One huge offender was
rename(). Going point by point would fill a book.

3) Actual running RAM usage: Many targets will use less RAM and less
stack space (some more RAM because I upped the number of cache buffers
for large memory). There's very little memory lying fallow in rarely-used
areas (see 'Key core changes' below). Also, all targets may open the same
number of directory streams whereas before those with less than 8MB RAM
were limited to 8, not 12 implying those targets will save slightly
less.

4) Performance: The test_disk plugin shows markedly improved performance,
particularly in the area of (uncached) directory scanning, due partly to
more optimal directory reading and to a better sector cache algorithm.
Uncached times tend to be better while there is a bit of a slowdown in
dircache due to it being a bit heavier of an implementation. It's not
noticeable by a human as far as I can say.

Key core changes:
1) Files and directories share core code and data structures.

2) The filesystem code knows which descriptors refer to same file.
This ensures that changes from one stream are appropriately reflected
in every open descriptor for that file (fileobj_mgr.c).

3) File and directory cache buffers are borrowed from the main sector
cache. This means that when they are not in use by a file, they are not
wasted, but used for the cache. Most of the time, only a few of them
are needed. It also means that adding more file and directory handles
is less expensive. All one must do in ensure a large enough cache to
borrow from.

4) Relative path components are supported and the namespace is unified.
It does not support full relative paths to an implied current directory;
what is does support is use of "." and "..". Adding the former would
not be very difficult. The namespace is unified in the sense that
volumes may be specified several times along with relative parts, e.g.:
"/<0>/foo/../../<1>/bar" :<=> "/<1>/bar".

5) Stack usage is down due to sharing of data, static allocation and
less duplication of strings on the stack. This requires more
serialization than I would like but since the number of threads is
limited to a low number, the tradoff in favor of the stack seems
reasonable.

6) Separates and heirarchicalizes (sic) the SIM and APP filesystem
code. SIM path and volume handling is just like the target. Some
aspects of the APP file code get more straightforward (e.g. no path
hashing is needed).

Dircache:
Deserves its own section. Dircache is new but pays homage to the old.
The old one was not compatible and so it, since it got redone, does
all the stuff it always should have done such as:

1) It may be update and used at any time during the build process.
No longer has one to wait for it to finish building to do basic file
management (create, remove, rename, etc.).

2) It does not need to be either fully scanned or completely disabled;
it can be incomplete (i.e. overfilled, missing paths), still be
of benefit and be correct.

3) Handles mounting and dismounting of individual volumes which means
a full rebuild is not needed just because you pop a new SD card in the
slot. Now, because it reuses its freed entry data, may rebuild only
that volume.

4) Much more fundamental to the file code. When it is built, it is
the keeper of the master file list whether enabled or not ("disabled"
is just a state of the cache). Its must always to ready to be started
and bind all streams opened prior to being enabled.

5) Maintains any short filenames in OEM format which means that it does
not need to be rebuilt when changing the default codepage.

Miscellaneous Compatibility:
1) Update any other code that would otherwise not work such as the
hotswap mounting code in various card drivers.

2) File management: Clipboard needed updating because of the behavioral
changes. Still needs a little more work on some finer points.

3) Remove now-obsolete functionality such as the mutex's "no preempt"
flag (which was only for the prior FAT driver).

4) struct dirinfo uses time_t rather than raw FAT directory entry
time fields. I plan to follow up on genericizing everything there
(i.e. no FAT attributes).

5) unicode.c needed some redoing so that the file code does not try
try to load codepages during a scan, which is actually a problem with
the current code. The default codepage, if any is required, is now
kept in RAM separarately (bufalloced) from codepages specified to
iso_decode() (which must not be bufalloced because the conversion
may be done by playback threads).

Brings with it some additional reusable core code:
1) Revised file functions: Reusable code that does things such as
safe path concatenation and parsing without buffer limitations or
data duplication. Variants that copy or alter the input path may be
based off these.

To do:
1) Put dircache functionality back in the sim. Treating it internally
as a different kind of file system seems the best approach at this
time.

2) Restore use of dircache indexes in the playlist and database or
something effectively the same. Since the cache doesn't have to be
complete in order to be used, not getting a hit on the cache doesn't
unambiguously say if the path exists or not.

Change-Id: Ia30f3082a136253e3a0eae0784e3091d138915c8
Reviewed-on: http://gerrit.rockbox.org/566
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested: Michael Sevakis <jethead71@rockbox.org>

1 files changed, 0 insertions, 729 deletions

diff --git a/uisimulator/common/io.c b/uisimulator/common/io.c
deleted file mode 100644
index 6662e9ffda..0000000000
--- a/uisimulator/common/io.c
+++ /dev/null
@@ -1,729 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id$
- *
- * Copyright (C) 2002 Daniel Stenberg
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ****************************************************************************/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-#include <sys/stat.h>
-#include <time.h>
-#include <errno.h>
-#include "config.h"
-#include "system.h"
-#include "ata_idle_notify.h"
-#include "mv.h"
-
-#define HAVE_STATVFS (!defined(WIN32))
-#define HAVE_LSTAT   (!defined(WIN32))
-
-#if HAVE_STATVFS
-#include <sys/statvfs.h>
-#endif
-
-#ifdef WIN32
-#include <windows.h>
-#endif
-
-#ifndef _MSC_VER
-#include <dirent.h>
-#include <unistd.h>
-#else
-#include "dir-win32.h"
-#endif
-
-#include <fcntl.h>
-#ifdef HAVE_SDL_THREADS
-#include "thread-sdl.h"
-#else
-#define sim_thread_unlock() NULL
-#define sim_thread_lock(a)
-#endif
-#include "thread.h"
-#include "kernel.h"
-#include "debug.h"
-#include "ata.h" /* for IF_MV et al. */
-#include "rbpaths.h"
-#include "load_code.h"
-
-/* keep this in sync with file.h! */
-#undef MAX_PATH /* this avoids problems when building simulator */
-#define MAX_PATH 260
-#define MAX_OPEN_FILES 11
-
-/* Windows (and potentially other OSes) distinguish binary and text files.
- * Define a dummy for the others. */
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
-/* Unicode compatibility for win32 */
-#if defined __MINGW32__
-/* Rockbox unicode functions */
-extern const unsigned char* utf8decode(const unsigned char *utf8,
-                                       unsigned short *ucs);
-extern unsigned char* utf8encode(unsigned long ucs, unsigned char *utf8);
-
-/* Static buffers for the conversion results. This isn't thread safe,
- * but it's sufficient for rockbox. */
-static unsigned char convbuf1[3*MAX_PATH];
-static unsigned char convbuf2[3*MAX_PATH];
-
-static wchar_t* utf8_to_ucs2(const unsigned char *utf8, void *buffer)
-{
-    wchar_t *ucs = buffer;
-
-    while (*utf8)
-        utf8 = utf8decode(utf8, ucs++);
-
-    *ucs = 0;
-    return buffer;
-}
-static unsigned char *ucs2_to_utf8(const wchar_t *ucs, unsigned char *buffer)
-{
-    unsigned char *utf8 = buffer;
-
-    while (*ucs)
-        utf8 = utf8encode(*ucs++, utf8);
-
-    *utf8 = 0;
-    return buffer;
-}
-
-#define UTF8_TO_OS(a)  utf8_to_ucs2(a,convbuf1)
-#define OS_TO_UTF8(a)  ucs2_to_utf8(a,convbuf1)
-#define DIR_T       _WDIR
-#define DIRENT_T    struct _wdirent
-#define STAT_T      struct _stat
-extern int _wmkdir(const wchar_t*);
-extern int _wrmdir(const wchar_t*);
-#define MKDIR(a,b)  (_wmkdir)(UTF8_TO_OS(a))
-#define RMDIR(a)    (_wrmdir)(UTF8_TO_OS(a))
-#define OPENDIR(a)  (_wopendir)(UTF8_TO_OS(a))
-#define READDIR(a)  (_wreaddir)(a)
-#define CLOSEDIR(a) (_wclosedir)(a)
-#define STAT(a,b)   (_wstat)(UTF8_TO_OS(a),b)
-/* empty variable parameter list doesn't work for variadic macros,
- * so pretend the second parameter is variable too */
-#define OPEN(a,...) (_wopen)(UTF8_TO_OS(a), __VA_ARGS__)
-#define CLOSE(a)    (close)(a)
-#define REMOVE(a)   (_wremove)(UTF8_TO_OS(a))
-#define RENAME(a,b) (_wrename)(UTF8_TO_OS(a),utf8_to_ucs2(b,convbuf2))
-/* readlink isn't used in the sim yet (FIXME) */
-#define READLINK(a,b,c) ({ fprintf(stderr, "no readlink on windows yet"); abort(); })
-#else  /* !__MINGW32__ */
-
-#define UTF8_TO_OS(a) (a)
-#define OS_TO_UTF8(a) (a)
-#define DIR_T       DIR
-#define DIRENT_T    struct dirent
-#define STAT_T      struct stat
-#define MKDIR(a,b)  (mkdir)(a,b)
-#define RMDIR(a)    (rmdir)(a)
-#define OPENDIR(a)  (opendir)(a)
-#define READDIR(a)  (readdir)(a)
-#define CLOSEDIR(a) (closedir)(a)
-#define STAT(a,b)   (stat)(a,b)
-/* empty variable parameter list doesn't work for variadic macros,
- * so pretend the second parameter is variable too */
-#define OPEN(a, ...) (open)(a, __VA_ARGS__)
-#define CLOSE(x)    (close)(x)
-#define REMOVE(a)   (remove)(a)
-#define RENAME(a,b) (rename)(a,b)
-#define READLINK(a,b,c) (readlink)(a,b,c)
-
-#endif /* !__MINGW32__ */
-
-
-#ifdef HAVE_DIRCACHE
-int dircache_get_entry_id(const char *filename);
-void dircache_add_file(const char *name, long startcluster);
-void dircache_remove(const char *name);
-void dircache_rename(const char *oldname, const char *newname);
-#endif
-
-#ifndef APPLICATION
-
-#define SIMULATOR_DEFAULT_ROOT "simdisk"
-extern const char *sim_root_dir;
-
-static int num_openfiles = 0;
-
-/* from dir.h */
-struct dirinfo {
-    int attribute;
-    long size;
-    unsigned short wrtdate;
-    unsigned short wrttime;
-};
-
-struct sim_dirent {
-    unsigned char d_name[MAX_PATH];
-    struct dirinfo info;
-    long startcluster;
-};
-
-struct dirstruct {
-    void *dir; /* actually a DIR* dir */
-    char *name;
-} SIM_DIR;
-
-struct mydir {
-    DIR_T *dir;
-    IF_MV(int volumes_returned);
-    char *name;
-};
-
-typedef struct mydir MYDIR;
-
-static unsigned int rockbox2sim(int opt)
-{
-#if 0
-/* this shouldn't be needed since we use the host's versions */
-    int newopt = O_BINARY;
-
-    if(opt & 1)
-        newopt |= O_WRONLY;
-    if(opt & 2)
-        newopt |= O_RDWR;
-    if(opt & 4)
-        newopt |= O_CREAT;
-    if(opt & 8)
-        newopt |= O_APPEND;
-    if(opt & 0x10)
-        newopt |= O_TRUNC;
-
-    return newopt;
-#else
-    return opt|O_BINARY;
-#endif
-}
-
-#endif /* APPLICATION */
-
-/** Simulator I/O engine routines **/
-#define IO_YIELD_THRESHOLD 512
-
-enum io_dir
-{
-    IO_READ,
-    IO_WRITE,
-};
-
-struct sim_io
-{
-    struct mutex sim_mutex; /* Rockbox mutex */
-    int cmd; /* The command to perform */
-    int ready; /* I/O ready flag - 1= ready */
-    int fd; /* The file to read/write */
-    void *buf; /* The buffer to read/write */
-    size_t count; /* Number of bytes to read/write */
-    size_t accum; /* Acculated bytes transferred */
-};
-
-static struct sim_io io;
-
-int ata_init(void)
-{
-    /* Initialize the rockbox kernel objects on a rockbox thread */
-    mutex_init(&io.sim_mutex);
-    io.accum = 0;
-    return 1;
-}
-
-int ata_spinup_time(void)
-{
-    return HZ;
-}
-
-static ssize_t io_trigger_and_wait(enum io_dir cmd)
-{
-    void *mythread = NULL;
-    ssize_t result;
-
-    if (io.count > IO_YIELD_THRESHOLD ||
-        (io.accum += io.count) >= IO_YIELD_THRESHOLD)
-    {
-        /* Allow other rockbox threads to run */
-        io.accum = 0;
-        mythread = sim_thread_unlock();
-    }
-
-    switch (cmd)
-    {
-    case IO_READ:
-        result = read(io.fd, io.buf, io.count);
-        break;
-    case IO_WRITE:
-        result = write(io.fd, io.buf, io.count);
-        break;
-        /* shut up gcc */
-    default:
-        result = -1;
-    }
-
-    call_storage_idle_notifys(false);
-
-    /* Regain our status as current */
-    if (mythread != NULL)
-    {
-        sim_thread_lock(mythread);
-    }
-
-    return result;
-}
-
-
-ssize_t sim_read(int fd, void *buf, size_t count)
-{
-    ssize_t result;
-
-    mutex_lock(&io.sim_mutex);
-
-    /* Setup parameters */
-    io.fd = fd;
-    io.buf = buf;
-    io.count = count;
-
-    result = io_trigger_and_wait(IO_READ);
-
-    mutex_unlock(&io.sim_mutex);
-
-    return result;
-}
-
-
-ssize_t sim_write(int fd, const void *buf, size_t count)
-{
-    ssize_t result;
-
-    mutex_lock(&io.sim_mutex);
-
-    io.fd = fd;
-    io.buf = (void*)buf;
-    io.count = count;
-
-    result = io_trigger_and_wait(IO_WRITE);
-
-    mutex_unlock(&io.sim_mutex);
-
-    return result;
-}
-
-#if !defined(APPLICATION)
-
-static const char *handle_special_links(const char* link)
-{
-#ifdef HAVE_MULTIDRIVE
-    static char buffer[MAX_PATH]; /* sufficiently big */
-    char vol_string[VOL_ENUM_POS + 8];
-    int len = sprintf(vol_string, VOL_NAMES, 1);
-
-    /* link might be passed with or without HOME_DIR expanded. To handle
-     * both perform substring matching (VOL_NAMES is unique enough) */
-    const char *begin = strstr(link, vol_string);
-    if (begin)
-    {
-        /* begin now points to the start of vol_string within link,
-         * we want to copy the remainder of the paths, prefixed by
-         * the actual mount point (the remainder might be "") */
-        snprintf(buffer, sizeof(buffer), "%s/../simext/%s",
-                 sim_root_dir ?: SIMULATOR_DEFAULT_ROOT, begin + len);
-        return buffer;
-    }
-    else
-#endif
-        return link;
-}
-
-
-static const char *get_sim_pathname(const char *name)
-{
-    static char buffer[MAX_PATH]; /* sufficiently big */
-
-    if(name[0] == '/')
-    {
-        snprintf(buffer, sizeof(buffer), "%s%s", 
-                 sim_root_dir ?: SIMULATOR_DEFAULT_ROOT, name);
-        return handle_special_links(buffer);
-    }
-    fprintf(stderr, "WARNING, bad file name lacks slash: %s\n", name);
-    return name;
-}
-
-
-MYDIR *sim_opendir(const char *name)
-{
-    DIR_T *dir;
-    dir = (DIR_T *) OPENDIR(get_sim_pathname(name));
-
-    if (dir)
-    {
-        MYDIR *my = (MYDIR *)malloc(sizeof(MYDIR));
-        my->dir = dir;
-        my->name = (char *)malloc(strlen(name)+1);
-        strcpy(my->name, name);
-        IF_MV(my->volumes_returned = 0);
-
-        return my;
-    }
-    /* failed open, return NULL */
-    return (MYDIR *)0;
-}
-
-#if defined(WIN32)
-static inline struct tm* localtime_r (const time_t *clock, struct tm *result) {
-       if (!clock || !result) return NULL;
-       memcpy(result,localtime(clock),sizeof(*result));
-       return result;
-}
-#endif
-
-struct sim_dirent *sim_readdir(MYDIR *dir)
-{
-    char buffer[MAX_PATH]; /* sufficiently big */
-    static struct sim_dirent secret;
-    STAT_T s;
-    struct tm tm;
-    DIRENT_T *x11;
-
-#ifdef EOVERFLOW
-read_next:
-#endif
-
-#define ATTR_LINK      0x80 /* see dir.h */
-
-    secret.info.attribute = 0;
-#ifdef HAVE_MULTIVOLUME
-    if (dir->name[0] == '/' && dir->name[1] == '\0'
-            && dir->volumes_returned++ < (NUM_VOLUMES-1)
-            && volume_present(dir->volumes_returned))
-    {
-        sprintf((char *)secret.d_name, VOL_NAMES, dir->volumes_returned);
-        secret.info.attribute = ATTR_LINK;
-        /* build file name for stat() which is the actual mount point */
-        snprintf(buffer, sizeof(buffer), "%s/../simext",
-                 sim_root_dir ?: SIMULATOR_DEFAULT_ROOT);
-    }
-    else
-#endif
-    {
-        x11 = READDIR(dir->dir);
-
-        if(!x11)
-            return (struct sim_dirent *)0;
-
-        strcpy((char *)secret.d_name, OS_TO_UTF8(x11->d_name));
-        /* build file name for stat() */
-        snprintf(buffer, sizeof(buffer), "%s/%s",
-                get_sim_pathname(dir->name), secret.d_name);
-    }
-
-    if (STAT(buffer, &s)) /* get info */
-    {
-#ifdef EOVERFLOW
-        /* File size larger than 2 GB? */
-        if (errno == EOVERFLOW)
-        {
-            DEBUGF("stat() overflow for %s. Skipping\n", buffer);
-            goto read_next;
-        }
-#endif
-
-        return NULL;
-    }
-
-#define ATTR_DIRECTORY 0x10
-
-    if (S_ISDIR(s.st_mode))
-        secret.info.attribute = ATTR_DIRECTORY;
-
-    secret.info.size = s.st_size;
-    
-    if (localtime_r(&(s.st_mtime), &tm) == NULL)
-        return NULL;
-    secret.info.wrtdate = ((tm.tm_year - 80) << 9) |
-                        ((tm.tm_mon + 1) << 5) |
-                        tm.tm_mday;
-    secret.info.wrttime = (tm.tm_hour << 11) |
-                        (tm.tm_min << 5) |
-                        (tm.tm_sec >> 1);
-
-#if HAVE_LSTAT
-    if (!lstat(buffer, &s) && S_ISLNK(s.st_mode))
-    {
-        secret.info.attribute |= ATTR_LINK;
-    }
-#endif
-
-    return &secret;
-}
-
-void sim_closedir(MYDIR *dir)
-{
-    free(dir->name);
-    CLOSEDIR(dir->dir);
-
-    free(dir);
-}
-
-int sim_open(const char *name, int o, ...)
-{
-    int opts = rockbox2sim(o);
-    int ret;
-    if (num_openfiles >= MAX_OPEN_FILES)
-        return -2;
-
-    if (opts & O_CREAT)
-    {
-        va_list ap;
-        va_start(ap, o);
-        mode_t mode = va_arg(ap, unsigned int);
-        ret = OPEN(get_sim_pathname(name), opts, mode);
-#ifdef HAVE_DIRCACHE
-        if (ret >= 0 && (dircache_get_entry_id(name) < 0))
-            dircache_add_file(name, 0);
-#endif
-        va_end(ap);
-    }
-    else
-        ret = OPEN(get_sim_pathname(name), opts);
-
-    if (ret >= 0)
-        num_openfiles++;
-    return ret;
-}
-
-int sim_close(int fd)
-{
-    int ret;
-    ret = CLOSE(fd);
-    if (ret == 0)
-        num_openfiles--;
-    return ret;
-}
-
-int sim_creat(const char *name, mode_t mode)
-{
-    int ret = OPEN(get_sim_pathname(name),
-                   O_BINARY | O_WRONLY | O_CREAT | O_TRUNC, mode);
-#ifdef HAVE_DIRCACHE
-    if (ret >= 0 && (dircache_get_entry_id(name) < 0))
-        dircache_add_file(name, 0);
-#endif
-    return ret;
-}
-
-int sim_mkdir(const char *name)
-{
-    return MKDIR(get_sim_pathname(name), 0777);
-}
-
-int sim_rmdir(const char *name)
-{
-    return RMDIR(get_sim_pathname(name));
-}
-
-int sim_remove(const char *name)
-{
-    int ret = REMOVE(get_sim_pathname(name));
-#ifdef HAVE_DIRCACHE
-    if (ret >= 0)
-        dircache_remove(name);
-#endif
-    return ret;
-}
-
-int sim_rename(const char *oldname, const char *newname)
-{
-    char sim_old[MAX_PATH];
-    char sim_new[MAX_PATH];
-#ifdef HAVE_DIRCACHE
-    dircache_rename(oldname, newname);
-#endif
-    // This is needed as get_sim_pathname() has a static buffer
-    strncpy(sim_old, get_sim_pathname(oldname), MAX_PATH);
-    strncpy(sim_new, get_sim_pathname(newname), MAX_PATH);
-    return RENAME(sim_old, sim_new);
-}
-
-/* rockbox off_t may be different from system off_t */
-long sim_lseek(int fildes, long offset, int whence)
-{
-    return lseek(fildes, offset, whence);
-}
-
-#else
-#define get_sim_pathname(x) x
-#endif
-
-long filesize(int fd)
-{
-#ifdef WIN32
-    return _filelength(fd);
-#else
-    struct stat buf;
-
-    if (!fstat(fd, &buf))
-        return buf.st_size;
-    else
-        return -1;
-#endif
-}
-
-void fat_size(IF_MV(int volume,) unsigned long* size, unsigned long* free)
-{
-#ifdef HAVE_MULTIVOLUME
-    if (volume != 0) {
-        /* debugf("io.c: fat_size(volume=%d); simulator only supports volume 0\n",volume); */
-
-        if (size) *size = 0;
-        if (free) *free = 0;
-        return;
-    }
-#endif
-
-#ifdef WIN32
-    long secperclus, bytespersec, free_clusters, num_clusters;
-
-    if (GetDiskFreeSpace(NULL, &secperclus, &bytespersec, &free_clusters,
-                     &num_clusters)) {
-        if (size)
-            *size = num_clusters * secperclus / 2 * (bytespersec / 512);
-        if (free)
-            *free = free_clusters * secperclus / 2 * (bytespersec / 512);
-    } else
-#elif HAVE_STATVFS
-    struct statvfs vfs;
-
-    if (!statvfs(".", &vfs)) {
-        DEBUGF("statvfs: frsize=%d blocks=%ld free=%ld\n",
-               (int)vfs.f_frsize, (long)vfs.f_blocks, (long)vfs.f_bfree);
-        if (size)
-            *size = vfs.f_blocks / 2 * (vfs.f_frsize / 512);
-        if (free)
-            *free = vfs.f_bfree / 2 * (vfs.f_frsize / 512);
-    } else
-#endif
-    {
-        if (size)
-            *size = 0;
-        if (free)
-            *free = 0;
-    }
-}
-
-int sim_fsync(int fd)
-{
-#ifdef WIN32
-    return _commit(fd);
-#else
-    return fsync(fd);
-#endif
-}
-
-#ifndef __PCTOOL__
-
-#include <SDL_loadso.h>
-void *lc_open(const char *filename, unsigned char *buf, size_t buf_size)
-{
-    (void)buf;
-    (void)buf_size;
-    void *handle = SDL_LoadObject(get_sim_pathname(filename));
-    if (handle == NULL)
-    {
-        DEBUGF("failed to load %s\n", filename);
-        DEBUGF("lc_open(%s): %s\n", filename, SDL_GetError());
-    }
-    return handle;
-}
-
-void *lc_get_header(void *handle)
-{
-    char *ret = SDL_LoadFunction(handle, "__header");
-    if (ret == NULL)
-        ret = SDL_LoadFunction(handle, "___header");
-
-    return ret;
-}
-
-void lc_close(void *handle)
-{
-    SDL_UnloadObject(handle);
-}
-
-void *lc_open_from_mem(void *addr, size_t blob_size)
-{
-#ifndef SIMULATOR
-    (void)addr;
-    (void)blob_size;
-    /* we don't support loading code from memory on application builds,
-     * it doesn't make sense (since it means writing the blob to disk again and
-     * then falling back to load from disk) and requires the ability to write
-     * to an executable directory */
-    return NULL;
-#else
-    /* support it in the sim for the sake of simulating */
-    int fd, i;
-    char temp_filename[MAX_PATH];
-
-    /* We have to create the dynamic link library file from ram so we
-       can simulate the codec loading. With voice and crossfade,
-       multiple codecs may be loaded at the same time, so we need
-       to find an unused filename */
-    for (i = 0; i < 10; i++)
-    {
-        snprintf(temp_filename, sizeof(temp_filename),
-                 ROCKBOX_DIR "/libtemp_binary_%d.dll", i);
-        fd = open(temp_filename, O_WRONLY|O_CREAT|O_TRUNC, 0700);
-        if (fd >= 0)
-            break;  /* Created a file ok */
-    }
-
-    if (fd < 0)
-    {
-        DEBUGF("open failed\n");
-        return NULL;
-    }
-
-    if (write(fd, addr, blob_size) < (ssize_t)blob_size)
-    {
-        DEBUGF("Write failed\n");
-        close(fd);
-        remove(temp_filename);
-        return NULL;
-    }
-
-    close(fd);
-    return lc_open(temp_filename, NULL, 0);
-#endif
-}
-
-#endif /* __PCTOOL__ */
-
-/* rockbox off_t may be different from system off_t */
-int sim_ftruncate(int fd, long length)
-{
-#ifdef WIN32
-    return _chsize(fd, length);
-#else
-    return ftruncate(fd, length);
-#endif
-}