pcompress/bzip2_compress.c
2012-07-07 22:18:29 +05:30

161 lines
3.5 KiB
C

/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program 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 3 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
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This program includes partly-modified public domain source
* code from the LZMA SDK: http://www.7-zip.org/sdk.html
*/
#include <sys/types.h>
#include <stdio.h>
#include <strings.h>
#include <bzlib.h>
#include <utils.h>
#include <pcompress.h>
#include <allocator.h>
static void *
slab_alloc_i(void *p, int items, int size) {
void *ptr;
size_t tot = (size_t)items * (size_t)size;
ptr = slab_alloc(p, tot);
return (ptr);
}
void
bzip2_stats(int show)
{
}
int
bzip2_init(void **data, int *level, ssize_t chunksize)
{
if (*level > 9) *level = 9;
return (0);
}
static void
bzerr(int err)
{
switch (err) {
case BZ_SEQUENCE_ERROR:
fprintf(stderr, "Bzip2: Call sequence error, buggy code ?\n");
break;
case BZ_PARAM_ERROR:
fprintf(stderr, "Bzip2: Invalid parameter\n");
break;
case BZ_MEM_ERROR:
fprintf(stderr, "Bzip2: Out of memory\n");
break;
case BZ_DATA_ERROR:
fprintf(stderr, "Bzip2: Data integrity checksum error\n");
break;
case BZ_DATA_ERROR_MAGIC:
fprintf(stderr, "Bzip2: Invalid magic number in compressed buf\n");
break;
case BZ_OUTBUFF_FULL:
fprintf(stderr, "Bzip2: Output buffer overflow\n");
break;
case BZ_CONFIG_ERROR:
fprintf(stderr, "Bzip2: Improper library config on platform\n");
break;
default:
fprintf(stderr, "Bzip2: Unknown error code: %d\n", err);
}
}
int
bzip2_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
bz_stream bzs;
int ret;
unsigned int _dstlen;
bzs.bzalloc = slab_alloc_i;
bzs.bzfree = slab_free;
bzs.opaque = NULL;
ret = BZ2_bzCompressInit(&bzs, level, 0, 30);
if (ret != BZ_OK) {
bzerr(ret);
return (-1);
}
bzs.next_in = src;
bzs.avail_in = srclen;
bzs.next_out = dst;
bzs.avail_out = *dstlen;
ret = BZ2_bzCompress(&bzs, BZ_FINISH);
if (ret == BZ_FINISH_OK) {
BZ2_bzCompressEnd(&bzs);
return (-1);
}
if (ret != BZ_STREAM_END) {
BZ2_bzCompressEnd(&bzs);
bzerr(ret);
return (-1);
}
/* normal termination */
*dstlen -= bzs.avail_out;
BZ2_bzCompressEnd(&bzs);
return (0);
}
int
bzip2_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
bz_stream bzs;
int ret;
bzs.bzalloc = slab_alloc_i;
bzs.bzfree = slab_free;
bzs.opaque = NULL;
ret = BZ2_bzDecompressInit(&bzs, 0, 0);
if (ret != BZ_OK) {
bzerr(ret);
return (-1);
}
bzs.next_in = (uchar_t *)src;
bzs.avail_in = srclen;
bzs.next_out = dst;
bzs.avail_out = *dstlen;
ret = BZ2_bzDecompress(&bzs);
if (ret == BZ_FINISH_OK) {
BZ2_bzDecompressEnd(&bzs);
bzerr(ret);
return (-1);
}
if (ret != BZ_STREAM_END) {
BZ2_bzDecompressEnd(&bzs);
bzerr(ret);
return (-1);
}
/* normal termination */
*dstlen -= bzs.avail_out;
BZ2_bzDecompressEnd(&bzs);
return (0);
}