pcompress/adaptive_compress.c

398 lines
12 KiB
C

/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012-2013 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.
*
* 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/>.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*/
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#if defined(sun) || defined(__sun)
#include <sys/byteorder.h>
#else
#include <byteswap.h>
#endif
#include <utils.h>
#include <pcompress.h>
#include <allocator.h>
#include <pc_archive.h>
#define FIFTY_PCT(x) (((x)/10) * 5)
#define FORTY_PCT(x) (((x)/10) * 4)
#define ONE_PCT(x) ((x)/100)
static unsigned int lzma_count = 0;
static unsigned int bzip2_count = 0;
static unsigned int bsc_count = 0;
static unsigned int ppmd_count = 0;
static unsigned int lz4_count = 0;
extern int lzma_compress(void *src, uint64_t srclen, void *dst,
uint64_t *destlen, int level, uchar_t chdr, int btype, void *data);
extern int bzip2_compress(void *src, uint64_t srclen, void *dst,
uint64_t *destlen, int level, uchar_t chdr, int btype, void *data);
extern int ppmd_compress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int libbsc_compress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int lz4_compress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int lzma_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int bzip2_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int ppmd_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int libbsc_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int lz4_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data);
extern int lzma_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op);
extern int lzma_deinit(void **data);
extern int ppmd_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op);
extern int ppmd_deinit(void **data);
extern int libbsc_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op);
extern int libbsc_deinit(void **data);
extern int lz4_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op);
extern int lz4_deinit(void **data);
extern int ppmd_alloc(void *data);
extern void ppmd_free(void *data);
extern int ppmd_state_init(void **data, int *level, int alloc);
struct adapt_data {
void *lzma_data;
void *ppmd_data;
void *bsc_data;
void *lz4_data;
int adapt_mode;
};
void
adapt_stats(int show)
{
if (show) {
if (bzip2_count > 0 || bsc_count > 0 || ppmd_count > 0 || lzma_count > 0) {
log_msg(LOG_INFO, 0, "Adaptive mode stats:");
log_msg(LOG_INFO, 0, " BZIP2 chunk count: %u", bzip2_count);
log_msg(LOG_INFO, 0, " LIBBSC chunk count: %u", bsc_count);
log_msg(LOG_INFO, 0, " PPMd chunk count: %u", ppmd_count);
log_msg(LOG_INFO, 0, " LZMA chunk count: %u", lzma_count);
log_msg(LOG_INFO, 0, " LZ4 chunk count: %u", lz4_count);
} else {
log_msg(LOG_INFO, 0, "\n");
}
}
lzma_count = 0;
bzip2_count = 0;
bsc_count = 0;
ppmd_count = 0;
lz4_count = 0;
}
void
adapt_props(algo_props_t *data, int level, uint64_t chunksize)
{
data->delta2_span = 200;
data->deltac_min_distance = EIGHTM;
}
int
adapt_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op)
{
struct adapt_data *adat = (struct adapt_data *)(*data);
int rv = 0, lv = 1;
if (!adat) {
adat = (struct adapt_data *)slab_alloc(NULL, sizeof (struct adapt_data));
adat->adapt_mode = 1;
rv = ppmd_state_init(&(adat->ppmd_data), level, 0);
/*
* LZ4 is used to tackle some embedded archive headers and/or zero paddings in
* otherwise incompressible data. So we always use it at the lowest and fastest
* compression level.
*/
if (rv == 0)
rv = lz4_init(&(adat->lz4_data), &lv, nthreads, chunksize, file_version, op);
adat->lzma_data = NULL;
adat->bsc_data = NULL;
*data = adat;
if (*level > 9) *level = 9;
}
lzma_count = 0;
bzip2_count = 0;
ppmd_count = 0;
bsc_count = 0;
lz4_count = 0;
return (rv);
}
int
adapt2_init(void **data, int *level, int nthreads, uint64_t chunksize,
int file_version, compress_op_t op)
{
struct adapt_data *adat = (struct adapt_data *)(*data);
int rv = 0, lv;
if (!adat) {
adat = (struct adapt_data *)slab_alloc(NULL, sizeof (struct adapt_data));
adat->adapt_mode = 2;
adat->ppmd_data = NULL;
adat->bsc_data = NULL;
lv = *level;
if (lv > 10) lv = 10;
rv = ppmd_state_init(&(adat->ppmd_data), level, 0);
lv = *level;
if (rv == 0)
rv = lzma_init(&(adat->lzma_data), &lv, nthreads, chunksize, file_version, op);
lv = *level;
#ifdef ENABLE_PC_LIBBSC
if (rv == 0)
rv = libbsc_init(&(adat->bsc_data), &lv, nthreads, chunksize, file_version, op);
#endif
/*
* LZ4 is used to tackle some embedded archive headers and/or zero paddings in
* otherwise incompressible data. So we always use it at the lowest and fastest
* compression level.
*/
lv = 1;
if (rv == 0)
rv = lz4_init(&(adat->lz4_data), &lv, nthreads, chunksize, file_version, op);
*data = adat;
if (*level > 9) *level = 9;
}
lzma_count = 0;
bzip2_count = 0;
ppmd_count = 0;
bsc_count = 0;
lz4_count = 0;
return (rv);
}
int
adapt_deinit(void **data)
{
struct adapt_data *adat = (struct adapt_data *)(*data);
int rv = 0;
if (adat) {
rv = ppmd_deinit(&(adat->ppmd_data));
if (adat->lzma_data)
rv += lzma_deinit(&(adat->lzma_data));
if (adat->lz4_data)
rv += lz4_deinit(&(adat->lz4_data));
slab_free(NULL, adat);
*data = NULL;
}
return (rv);
}
/*
* Identify the types that BSC can compress better than others.
*/
int
is_bsc_type(int btype)
{
int stype = PC_SUBTYPE(btype);
return ((stype == TYPE_MARKUP) | (stype == TYPE_BMP) | (stype == TYPE_DNA_SEQ) |
(stype == TYPE_MP4) | (stype == TYPE_FLAC) | (stype == TYPE_AVI) | (stype == TYPE_DICOM));
}
int
adapt_compress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data)
{
struct adapt_data *adat = (struct adapt_data *)(data);
uchar_t *src1 = (uchar_t *)src;
int rv = 0, bsc_type = 0;
int stype = PC_SUBTYPE(btype);
if (btype == TYPE_UNKNOWN || stype == TYPE_ARCHIVE_TAR) {
uint64_t i, tot8b, tag1, tag2, tag3;
double tagcnt, pct_tag;
uchar_t cur_byte, prev_byte;
/*
* Count number of 8-bit binary bytes and XML tags in source.
*/
tot8b = 0;
tag1 = 0;
tag2 = 0;
tag3 = 0;
prev_byte = cur_byte = 0;
for (i = 0; i < srclen; i++) {
cur_byte = src1[i];
tot8b += (cur_byte & 0x80); // This way for possible auto-vectorization
tag1 += (cur_byte == '<');
tag2 += (cur_byte == '>');
tag3 += ((prev_byte == '<') & (cur_byte == '/'));
tag3 += ((prev_byte == '/') & (cur_byte == '>'));
if (cur_byte != ' ')
prev_byte = cur_byte;
}
/*
* Heuristics for detecting BINARY vs generic TEXT vs XML data.
*/
tot8b /= 0x80;
tagcnt = tag1 + tag2 + tag3;
pct_tag = tagcnt / (double)srclen;
if (adat->adapt_mode == 2 && tot8b > FORTY_PCT(srclen)) {
btype = TYPE_BINARY;
} else if (adat->adapt_mode == 1 && tot8b > FIFTY_PCT(srclen)) {
btype = TYPE_BINARY;
} else {
btype = TYPE_TEXT;
if (tag1 > tag2 - 4 && tag1 < tag2 + 4 && tag3 > (double)tag1 * 0.40 &&
tagcnt > (double)srclen * 0.001)
btype |= TYPE_MARKUP;
}
} else if (stype == TYPE_PDF) {
uint64_t i, tot8b;
uchar_t cur_byte;
/*
* For PDF files we need to check for uncompressed PDFs. Those are compressed
* using Libbsc.
*/
tot8b = 0;
for (i = 0; i < srclen; i++) {
cur_byte = src1[i];
tot8b += (cur_byte & 0x80);
}
tot8b /= 0x80;
if (adat->adapt_mode == 2 && tot8b > FORTY_PCT(srclen)) {
btype = TYPE_BINARY;
} else if (adat->adapt_mode == 1 && tot8b > FIFTY_PCT(srclen)) {
btype = TYPE_BINARY;
} else {
btype = TYPE_TEXT|TYPE_MARKUP;
}
}
/*
* Use PPMd if some percentage of source is 7-bit textual bytes, otherwise
* use Bzip2 or LZMA. For totally incompressible data we always use LZ4. There
* is no point trying to compress such data, like Jpegs. However some archive headers
* and zero paddings can exist which LZ4 can easily take care of very fast.
*/
#ifdef ENABLE_PC_LIBBSC
bsc_type = is_bsc_type(btype);
#endif
if (is_incompressible(btype)) {
rv = lz4_compress(src, srclen, dst, dstlen, level, chdr, btype, adat->lz4_data);
if (rv < 0)
return (rv);
rv = ADAPT_COMPRESS_LZ4;
lz4_count++;
} else if (adat->adapt_mode == 2 && PC_TYPE(btype) == TYPE_BINARY && !bsc_type) {
rv = lzma_compress(src, srclen, dst, dstlen, level, chdr, btype, adat->lzma_data);
if (rv < 0)
return (rv);
rv = ADAPT_COMPRESS_LZMA;
lzma_count++;
} else if (adat->adapt_mode == 1 && PC_TYPE(btype) == TYPE_BINARY && !bsc_type) {
rv = bzip2_compress(src, srclen, dst, dstlen, level, chdr, btype, NULL);
if (rv < 0)
return (rv);
rv = ADAPT_COMPRESS_BZIP2;
bzip2_count++;
} else {
#ifdef ENABLE_PC_LIBBSC
if (adat->bsc_data && bsc_type) {
rv = libbsc_compress(src, srclen, dst, dstlen, level, chdr, btype, adat->bsc_data);
if (rv < 0)
return (rv);
rv = ADAPT_COMPRESS_BSC;
bsc_count++;
} else {
#endif
rv = ppmd_alloc(adat->ppmd_data);
if (rv < 0)
return (rv);
rv = ppmd_compress(src, srclen, dst, dstlen, level, chdr, btype, adat->ppmd_data);
ppmd_free(adat->ppmd_data);
if (rv < 0)
return (rv);
rv = ADAPT_COMPRESS_PPMD;
ppmd_count++;
#ifdef ENABLE_PC_LIBBSC
}
#endif
}
return (rv);
}
int
adapt_decompress(void *src, uint64_t srclen, void *dst,
uint64_t *dstlen, int level, uchar_t chdr, int btype, void *data)
{
struct adapt_data *adat = (struct adapt_data *)(data);
uchar_t cmp_flags;
cmp_flags = CHDR_ALGO(chdr);
if (cmp_flags == ADAPT_COMPRESS_LZ4) {
return (lz4_decompress(src, srclen, dst, dstlen, 1, chdr, btype, adat->lz4_data));
} else if (cmp_flags == ADAPT_COMPRESS_LZMA) {
return (lzma_decompress(src, srclen, dst, dstlen, level, chdr, btype, adat->lzma_data));
} else if (cmp_flags == ADAPT_COMPRESS_BZIP2) {
return (bzip2_decompress(src, srclen, dst, dstlen, level, chdr, btype, NULL));
} else if (cmp_flags == ADAPT_COMPRESS_PPMD) {
int rv;
rv = ppmd_alloc(adat->ppmd_data);
if (rv < 0)
return (rv);
rv = ppmd_decompress(src, srclen, dst, dstlen, level, chdr, btype, adat->ppmd_data);
ppmd_free(adat->ppmd_data);
return (rv);
} else if (cmp_flags == ADAPT_COMPRESS_BSC) {
#ifdef ENABLE_PC_LIBBSC
return (libbsc_decompress(src, srclen, dst, dstlen, level, chdr, btype, adat->bsc_data));
#else
log_msg(LOG_ERR, 0, "Cannot decompress chunk. Libbsc support not present.\n");
return (-1);
#endif
} else {
log_msg(LOG_ERR, 0, "Unrecognized compression mode: %d, file corrupt.\n", cmp_flags);
}
return (-1);
}