258 lines
7.3 KiB
C
258 lines
7.3 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 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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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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* This program includes partly-modified public domain source
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* code from the LZMA SDK: http://www.7-zip.org/sdk.html
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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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#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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extern int lzma_compress(void *src, size_t srclen, void *dst,
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size_t *destlen, int level, uchar_t chdr, void *data);
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extern int bzip2_compress(void *src, size_t srclen, void *dst,
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size_t *destlen, int level, uchar_t chdr, void *data);
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extern int ppmd_compress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int libbsc_compress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int lzma_decompress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int bzip2_decompress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int ppmd_decompress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int libbsc_decompress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, void *data);
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extern int lzma_init(void **data, int *level, int nthreads, ssize_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, ssize_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, ssize_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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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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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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fprintf(stderr, "Adaptive mode stats:\n");
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fprintf(stderr, " BZIP2 chunk count: %u\n", bzip2_count);
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fprintf(stderr, " LIBBSC chunk count: %u\n", bsc_count);
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fprintf(stderr, " PPMd chunk count: %u\n", ppmd_count);
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fprintf(stderr, " LZMA chunk count: %u\n\n", lzma_count);
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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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}
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int
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adapt_init(void **data, int *level, int nthreads, ssize_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;
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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_init(&(adat->ppmd_data), level, 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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return (rv);
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}
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int
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adapt2_init(void **data, int *level, int nthreads, ssize_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, 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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rv = ppmd_init(&(adat->ppmd_data), &lv, nthreads, chunksize, file_version, op);
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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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*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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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;
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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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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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int
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adapt_compress(void *src, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, 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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size_t i, tot8b, tagcnt;
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int rv, tag;
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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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tagcnt = 0;
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for (i = 0; i < srclen; i++) {
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tot8b += (src1[i] >> 7);
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tag = ((src1[i] == '<') | (src1[i] == '>'));
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tagcnt += tag;
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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.
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*/
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if (adat->adapt_mode == 2 && tot8b > FORTY_PCT(srclen)) {
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rv = lzma_compress(src, srclen, dst, dstlen, level, chdr, adat->lzma_data);
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if (rv < 0)
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return (rv);
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rv = COMPRESS_LZMA;
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lzma_count++;
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} else if (adat->adapt_mode == 1 && tot8b > FIFTY_PCT(srclen)) {
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rv = bzip2_compress(src, srclen, dst, dstlen, level, chdr, NULL);
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if (rv < 0)
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return (rv);
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rv = COMPRESS_BZIP2;
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bzip2_count++;
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} else {
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if (adat->bsc_data && tagcnt > ONE_PCT(srclen)) {
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#ifdef ENABLE_PC_LIBBSC
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rv = libbsc_compress(src, srclen, dst, dstlen, level, chdr, adat->bsc_data);
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if (rv < 0)
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return (rv);
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rv = COMPRESS_BSC;
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bsc_count++;
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#endif
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} else {
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rv = ppmd_compress(src, srclen, dst, dstlen, level, chdr, adat->ppmd_data);
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if (rv < 0)
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return (rv);
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rv = COMPRESS_PPMD;
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ppmd_count++;
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}
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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, size_t srclen, void *dst,
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size_t *dstlen, int level, uchar_t chdr, 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>>4) & CHDR_ALGO_MASK;
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if (cmp_flags == COMPRESS_LZMA) {
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return (lzma_decompress(src, srclen, dst, dstlen, level, chdr, adat->lzma_data));
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} else if (cmp_flags == COMPRESS_BZIP2) {
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return (bzip2_decompress(src, srclen, dst, dstlen, level, chdr, NULL));
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} else if (cmp_flags == COMPRESS_PPMD) {
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return (ppmd_decompress(src, srclen, dst, dstlen, level, chdr, adat->ppmd_data));
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} else if (cmp_flags == COMPRESS_BSC) {
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#ifdef ENABLE_PC_LIBBSC
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return (libbsc_decompress(src, srclen, dst, dstlen, level, chdr, adat->bsc_data));
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#else
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fprintf(stderr, "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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fprintf(stderr, "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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