From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Sat, 25 Jun 2011 21:32:25 -0400
Subject: Add codecs to librbcodec.
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Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
---
 lib/rbcodec/codecs/libgme/inflate/bbfuncs.c | 147 ++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 lib/rbcodec/codecs/libgme/inflate/bbfuncs.c

(limited to 'lib/rbcodec/codecs/libgme/inflate/bbfuncs.c')

diff --git a/lib/rbcodec/codecs/libgme/inflate/bbfuncs.c b/lib/rbcodec/codecs/libgme/inflate/bbfuncs.c
new file mode 100644
index 0000000000..3b23c3b6db
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/inflate/bbfuncs.c
@@ -0,0 +1,147 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * 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 "bbfuncs.h"
+
+#if defined(ROCKBOX)
+#include "codeclib.h"
+#endif
+
+void error_die(const char* msg)
+{	
+    (void)msg;
+}
+
+void error_msg(const char* msg)
+{
+	(void)msg;
+}
+
+size_t safe_read(struct mbreader_t *md, void *buf, size_t count)
+{
+    ssize_t n;
+
+    do {
+        n = mbread(md, buf, count);
+    } while (n < 0&&n!=-1);
+
+    return n;
+}
+
+/*
+ * Read all of the supplied buffer from a file This does multiple reads as
+ *necessary. Returns the amount read, or -1 on an error. A short read is
+ *returned on an end of file.
+ */
+ssize_t full_read(struct mbreader_t *md, void *buf, size_t len)
+{
+    ssize_t cc;
+    ssize_t total;
+
+    total = 0;
+
+    while (len)
+    {
+        cc = safe_read(md, buf, len);
+
+        if (cc < 0)
+            return cc;    /* read() returns -1 on failure. */
+
+        if (cc == 0)
+            break;
+
+        buf = ((char *)buf) + cc;
+        total += cc;
+        len -= cc;
+    }
+
+    return total;
+}
+
+/* Die with an error message if we can't read the entire buffer. */
+void xread(struct mbreader_t *md, void *buf, ssize_t count)
+{
+    if (count)
+    {
+        ssize_t size = full_read(md, buf, count);
+        if (size != count)
+            error_die("short read");
+    }
+}
+
+/* Die with an error message if we can't read one character. */
+unsigned char xread_char(struct mbreader_t *md)
+{
+    unsigned char tmp;
+
+    xread(md, &tmp, 1);
+
+    return tmp;
+}
+
+void check_header_gzip(struct mbreader_t *src_md)
+{
+    union {
+        unsigned char raw[8];
+        struct {
+            unsigned char method;
+            unsigned char flags;
+            unsigned int mtime;
+            unsigned char xtra_flags;
+            unsigned char os_flags;
+        } formatted;
+    } header;
+
+    xread(src_md, header.raw, 8);
+
+    /* Check the compression method */
+    if (header.formatted.method != 8)
+        error_die("Unknown compression method");
+
+    if (header.formatted.flags & 0x04)
+    {
+        /* bit 2 set: extra field present */
+        unsigned char extra_short;
+
+        extra_short = xread_char(src_md) + (xread_char(src_md) << 8);
+        while (extra_short > 0)
+        {
+            /* Ignore extra field */
+            xread_char(src_md);
+            extra_short--;
+        }
+    }
+
+    /* Discard original name if any */
+    if (header.formatted.flags & 0x08)
+        /* bit 3 set: original file name present */
+        while(xread_char(src_md) != 0) ;
+
+    /* Discard file comment if any */
+    if (header.formatted.flags & 0x10)
+        /* bit 4 set: file comment present */
+        while(xread_char(src_md) != 0) ;
+
+    /* Read the header checksum */
+    if (header.formatted.flags & 0x02)
+    {
+        xread_char(src_md);
+        xread_char(src_md);
+    }
+}
-- 
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