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