pcompress/bzip2_compress.c

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/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* 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
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* version 3 of the License, or (at your option) any later version.
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*
* 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.
*
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* You should have received a copy of the GNU Lesser General Public
* License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
*/
#include <sys/types.h>
#include <stdio.h>
#include <strings.h>
#include <bzlib.h>
#include <utils.h>
#include <pcompress.h>
#include <allocator.h>
/*
* Max buffer size allowed for a single bzip2 compress/decompress call.
*/
#define SINGLE_CALL_MAX (2147483648UL)
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static void *
slab_alloc_i(void *p, int items, int size) {
void *ptr;
uint64_t tot = (uint64_t)items * (uint64_t)size;
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ptr = slab_alloc(p, tot);
return (ptr);
}
void
bzip2_stats(int show)
{
}
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void
bzip2_props(algo_props_t *data, int level, uint64_t chunksize) {
data->delta2_span = 200;
data->deltac_min_distance = FOURM;
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}
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int
bzip2_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op)
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{
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, uint64_t srclen, void *dst, uint64_t *dstlen,
int level, uchar_t chdr, void *data)
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{
bz_stream bzs;
int ret, ending;
unsigned int slen, dlen;
uint64_t _srclen = srclen;
uint64_t _dstlen = *dstlen;
char *dst1 = (char *)dst;
char *src1 = (char *)src;
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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);
}
ending = 0;
while (_srclen > 0) {
if (_srclen > SINGLE_CALL_MAX) {
slen = SINGLE_CALL_MAX;
} else {
slen = _srclen;
ending = 1;
}
if (_dstlen > SINGLE_CALL_MAX) {
dlen = SINGLE_CALL_MAX;
} else {
dlen = _dstlen;
}
bzs.next_in = src1;
bzs.avail_in = slen;
bzs.next_out = dst1;
bzs.avail_out = dlen;
if (!ending) {
ret = BZ2_bzCompress(&bzs, BZ_RUN);
if (ret != BZ_RUN_OK) {
BZ2_bzCompressEnd(&bzs);
return (-1);
}
} else {
ret = BZ2_bzCompress(&bzs, BZ_FINISH);
if (ret == BZ_FINISH_OK) {
BZ2_bzCompressEnd(&bzs);
return (-1);
}
if (ret != BZ_STREAM_END) {
BZ2_bzCompressEnd(&bzs);
return (-1);
}
}
dst1 += (dlen - bzs.avail_out);
_dstlen -= (dlen - bzs.avail_out);
src1 += slen;
_srclen -= slen;
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}
/* normal termination */
*dstlen = *dstlen - _dstlen;
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BZ2_bzCompressEnd(&bzs);
return (0);
}
int
bzip2_decompress(void *src, uint64_t srclen, void *dst, uint64_t *dstlen,
int level, uchar_t chdr, void *data)
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{
bz_stream bzs;
int ret;
unsigned int slen, dlen;
uint64_t _srclen = srclen;
uint64_t _dstlen = *dstlen;
char *dst1 = (char *)dst;
char *src1 = (char *)src;
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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);
}
while (_srclen > 0) {
if (_srclen > SINGLE_CALL_MAX) {
slen = SINGLE_CALL_MAX;
} else {
slen = _srclen;
}
if (_dstlen > SINGLE_CALL_MAX) {
dlen = SINGLE_CALL_MAX;
} else {
dlen = _dstlen;
}
bzs.next_in = src1;
bzs.avail_in = slen;
bzs.next_out = dst1;
bzs.avail_out = dlen;
ret = BZ2_bzDecompress(&bzs);
if (ret != BZ_OK && ret != BZ_STREAM_END) {
BZ2_bzDecompressEnd(&bzs);
bzerr(ret);
return (-1);
}
dst1 += (dlen - bzs.avail_out);
_dstlen -= (dlen - bzs.avail_out);
src1 += (slen - bzs.avail_in);
_srclen -= (slen - bzs.avail_in);
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}
/* normal termination */
*dstlen = *dstlen - _dstlen;
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BZ2_bzDecompressEnd(&bzs);
return (0);
}