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compressor.c
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compressor.c
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/*
*
* Copyright (c) 2009, 2010, 2011
* Phillip Lougher <phillip@squashfs.org.uk>
*
* 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,
* or (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* compressor.c
*/
#include <stdio.h>
#include <string.h>
#include "compressor.h"
#include "squashfs_fs.h"
// CJH: Added these includes
#include "error.h"
#ifndef GZIP_SUPPORT
static struct compressor gzip_comp_ops = {
ZLIB_COMPRESSION, "gzip"
};
#else
extern struct compressor gzip_comp_ops;
#endif
#ifndef LZMA_SUPPORT
static struct compressor lzma_comp_ops = {
LZMA_COMPRESSION, "lzma"
};
#else
extern struct compressor lzma_comp_ops;
#endif
#ifndef LZO_SUPPORT
static struct compressor lzo_comp_ops = {
LZO_COMPRESSION, "lzo"
};
#else
extern struct compressor lzo_comp_ops;
#endif
#ifndef LZ4_SUPPORT
static struct compressor lz4_comp_ops = {
LZ4_COMPRESSION, "lz4"
};
#else
extern struct compressor lz4_comp_ops;
#endif
#ifndef XZ_SUPPORT
static struct compressor xz_comp_ops = {
XZ_COMPRESSION, "xz"
};
#else
extern struct compressor xz_comp_ops;
#endif
extern struct compressor lzma_alt_comp_ops;
extern struct compressor lzma_wrt_comp_ops;
extern struct compressor lzma_adaptive_comp_ops;
static struct compressor unknown_comp_ops = {
0, "unknown"
};
struct compressor *compressor[] = {
&gzip_comp_ops,
&lzma_comp_ops,
// CJH: Added additional LZMA decompressors. Order is intentional.
&lzma_adaptive_comp_ops,
&lzma_alt_comp_ops,
&lzma_wrt_comp_ops,
&lzo_comp_ops,
&lz4_comp_ops,
&xz_comp_ops,
&unknown_comp_ops
};
int lookup_compressor_index(char *name)
{
int i;
for(i = 0; compressor[i]->id; i++)
{
if(strcmp(name, compressor[i]->name) == 0)
return i;
}
return -1;
}
struct compressor *lookup_compressor(char *name)
{
int i;
for(i = 0; compressor[i]->id; i++)
if(strcmp(compressor[i]->name, name) == 0)
break;
return compressor[i];
}
struct compressor *lookup_compressor_id(int id)
{
int i;
for(i = 0; compressor[i]->id; i++)
if(id == compressor[i]->id)
break;
return compressor[i];
}
void display_compressors(char *indent, char *def_comp)
{
int i;
for(i = 0; compressor[i]->id; i++)
if(compressor[i]->supported)
fprintf(stderr, "%s\t%s%s\n", indent,
compressor[i]->name,
strcmp(compressor[i]->name, def_comp) == 0 ?
" (default)" : "");
}
void display_compressor_usage(char *def_comp)
{
int i;
for(i = 0; compressor[i]->id; i++)
if(compressor[i]->supported) {
char *str = strcmp(compressor[i]->name, def_comp) == 0 ?
" (default)" : "";
if(compressor[i]->usage) {
fprintf(stderr, "\t%s%s\n",
compressor[i]->name, str);
compressor[i]->usage();
} else
fprintf(stderr, "\t%s (no options)%s\n",
compressor[i]->name, str);
}
}
// CJH: calls the currently selected decompressor, unless that fails, then tries the other decompressors
int detected_compressor_index = 0;
int compressor_uncompress(struct compressor *comp, void *dest, void *src, int size, int block_size, int *error)
{
int i = 0, retval = -1, default_compressor_id = -1;
if(detected_compressor_index)
{
retval = compressor[detected_compressor_index]->uncompress(dest, src, size, block_size, error);
}
if(retval < 1 && comp->uncompress)
{
if(!detected_compressor_index) ERROR("Trying to decompress using default %s decompressor...\n", comp->name);
retval = comp->uncompress(dest, src, size, block_size, error);
if(!detected_compressor_index)
{
if(retval > 0)
{
ERROR("Successfully decompressed with default %s decompressor\n", comp->name);
detected_compressor_index = lookup_compressor_index(comp->name);
}
else
{
TRACE("Default %s decompressor failed! [%d %d]\n", comp->name, retval, *error);
}
}
}
if(retval < 1)
{
default_compressor_id = comp->id;
for(i=0; compressor[i]->id; i++)
{
comp = compressor[i];
if(comp->id != default_compressor_id &&
comp->id != compressor[detected_compressor_index]->id &&
comp->uncompress)
{
ERROR("Trying to decompress with %s...\n", comp->name);
retval = comp->uncompress(dest, src, size, block_size, error);
if(retval > 0)
{
//TRACE("%s decompressor succeeded!\n", comp->name);
ERROR("Detected %s compression\n", comp->name);
detected_compressor_index = i;
break;
}
else
{
TRACE("%s decompressor failed! [%d %d]\n", comp->name, retval, *error);
}
}
}
}
return retval;
}