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/*
* Copyright (C) 2001, 2002, and 2003 Roy Keene
*
* 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 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* email: dact@rkeene.org
*/
#include "dact.h"
#include "comp_bzlib.h"
#ifdef HAVE_LIBBZ2
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#ifdef HAVE_BZLIB_H
#include <bzlib.h>
#endif
/*
mode - DACT_MODE_COMPR or DACT_MODE_DECMP
Determine whether to compress or decompress.
prev_block - Previous (uncompressed) block.
curr_block - The data to be compressed.
out_block - Where to put data after compression.
blk_size - Size of prev_block and curr_block.
*/
#if defined(USE_MODULES) && defined(AS_MODULE)
#include "module.h"
uint32_t DC_NUM=9;
uint32_t DC_TYPE=DACT_MOD_TYPE_COMP;
void *DC_ALGO=comp_bzlib_algo;
char *DC_NAME="Bzip2 Compression (MOD)";
#endif
int comp_bzlib_algo(int mode, unsigned char *prev_block, unsigned char *curr_block, unsigned char *out_block, int blk_size, int bufsize) {
switch(mode) {
case DACT_MODE_COMPR:
return(comp_bzlib_compress(prev_block, curr_block, out_block, blk_size, bufsize));
break; /* Heh */
case DACT_MODE_DECMP:
return(comp_bzlib_decompress(prev_block, curr_block, out_block, blk_size, bufsize));
break;
default:
fprintf(stderr, "Unsupported mode: %i\n", mode);
return(-1);
}
}
int comp_bzlib_compress(unsigned char *prev_block, unsigned char *curr_block, unsigned char *out_block, int blk_size, int bufsize) {
unsigned int dest_size=bufsize;
int retval;
#ifdef HAVE_OLD_BZ2
retval=bzBuffToBuffCompress((char *) out_block, &dest_size, (char *) curr_block, blk_size, 9, 0, 9);
#else
retval=BZ2_bzBuffToBuffCompress((char *) out_block, &dest_size, (char *) curr_block, blk_size, 9, 0, 9);
#endif
/* Remove the "BZh9" header. */
dest_size-=4;
memmove(out_block, out_block+4, dest_size);
if (retval!=BZ_OK) return(-1);
return(dest_size);
}
int comp_bzlib_decompress(unsigned char *prev_block, unsigned char *curr_block, unsigned char *out_block, int blk_size, int bufsize) {
unsigned int dest_size=bufsize;
char *tmpbuf;
int retval;
/* Replant the header. */
tmpbuf=malloc(blk_size+4);
memcpy(tmpbuf, "BZh9", 4);
memcpy(tmpbuf+4, curr_block, blk_size);
#ifdef HAVE_OLD_BZ2
retval=bzBuffToBuffDecompress((char *) out_block, &dest_size, tmpbuf, blk_size+4, 0, 0);
#else
retval=BZ2_bzBuffToBuffDecompress((char *) out_block, &dest_size, tmpbuf, blk_size+4, 0, 0);
#endif
free(tmpbuf);
if (retval!=BZ_OK) return(0);
return(dest_size);
}
#endif
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