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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <g3d/stream.h>
#include "imp_ar.h"
#define AR_FLAG_COPIED 0x80
#define AR_FLAG_COMPRESS 0x40
guint8 *ar_decompress_chunk(guint8 *src, guint16 srcsize, guint16 *dstsize)
{
guint8 *dst = NULL, bit = 16;
gint32 i, j = 0, k, pos, size;
guint16 cmd;
#if DEBUG > 2
printf("D: decompressing %d bytes chunk\n", srcsize);
#endif
if(src[0] == AR_FLAG_COPIED)
{
*dstsize = srcsize - 1;
dst = g_new0(guint8, *dstsize);
memcpy(dst, src + 1, *dstsize);
return dst;
}
*dstsize = 0;
cmd = (src[1] << 8) + src[2];
for(i = 3; i < srcsize;)
{
if(bit == 0)
{
/* get new command */
cmd = (src[i] << 8) + src[i + 1];
i += 2;
bit = 16;
}
if(cmd & 0x8000)
{
pos = (src[i] << 4) + (src[i + 1] >> 4);
i ++;
if(pos != 0)
{
/* copy known chunk */
size = (src[i] & 0xF) + 3;
*dstsize += size;
dst = g_realloc(dst, *dstsize);
i ++;
for(k = 0; k < size; k ++)
dst[j + k] = dst[j - pos + k];
j += size;
}
else
{
/* RLE style... */
size = (src[i] << 8) + src[i + 1] + 16;
*dstsize += size;
dst = g_realloc(dst, *dstsize);
i += 2;
for(k = 0; k < size; k ++)
dst[j + k] = src[i];
i ++;
j += size;
}
}
else
{
/* plain copy */
*dstsize += 1;
dst = g_realloc(dst, *dstsize);
dst[j] = src[i];
i ++;
j ++;
}
cmd <<= 1;
bit --;
}
return dst;
}
gboolean ar_decompress_to_file(G3DStream *stream, ArDirEntry *dirent)
{
FILE *o;
gchar cmd;
guint32 size;
guint16 srcsize, dstsize;
guint8 *src, *dst;
o = fopen(dirent->name, "wb");
if(o == NULL) {
g_warning("failed to write to '%s'", dirent->name);
return FALSE;
}
/* seek to file start */
g3d_stream_seek(stream, dirent->offset, G_SEEK_SET);
/* skip tags */
do {
cmd = g3d_stream_read_int8(stream);
if(cmd != 'D') {
size = g3d_stream_read_int32_le(stream);
g3d_stream_skip(stream, size);
}
} while(cmd != 'D');
#if DEBUG > 2
printf("D: starting decompression part\n");
#endif
/* decompress stuff */
while(1) {
srcsize = g3d_stream_read_int16_le(stream);
if(srcsize == 0)
break;
src = g_new0(guint8, srcsize);
g3d_stream_read(stream, src, srcsize);
dst = ar_decompress_chunk(src, srcsize, &dstsize);
if(dstsize > 0) {
fwrite(dst, 1, dstsize, o);
g_free(dst);
}
g_free(src);
}
fclose(o);
return TRUE;
}
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