161 lines
3.5 KiB
C
161 lines
3.5 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 <stdio.h>
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#include <strings.h>
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#include <bzlib.h>
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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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static void *
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slab_alloc_i(void *p, int items, int size) {
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void *ptr;
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size_t tot = (size_t)items * (size_t)size;
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ptr = slab_alloc(p, tot);
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return (ptr);
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}
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void
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bzip2_stats(int show)
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{
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}
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int
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bzip2_init(void **data, int *level, ssize_t chunksize)
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{
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if (*level > 9) *level = 9;
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return (0);
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}
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static void
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bzerr(int err)
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{
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switch (err) {
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case BZ_SEQUENCE_ERROR:
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fprintf(stderr, "Bzip2: Call sequence error, buggy code ?\n");
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break;
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case BZ_PARAM_ERROR:
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fprintf(stderr, "Bzip2: Invalid parameter\n");
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break;
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case BZ_MEM_ERROR:
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fprintf(stderr, "Bzip2: Out of memory\n");
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break;
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case BZ_DATA_ERROR:
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fprintf(stderr, "Bzip2: Data integrity checksum error\n");
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break;
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case BZ_DATA_ERROR_MAGIC:
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fprintf(stderr, "Bzip2: Invalid magic number in compressed buf\n");
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break;
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case BZ_OUTBUFF_FULL:
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fprintf(stderr, "Bzip2: Output buffer overflow\n");
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break;
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case BZ_CONFIG_ERROR:
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fprintf(stderr, "Bzip2: Improper library config on platform\n");
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break;
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default:
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fprintf(stderr, "Bzip2: Unknown error code: %d\n", err);
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}
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}
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int
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bzip2_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
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int level, uchar_t chdr, void *data)
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{
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bz_stream bzs;
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int ret;
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unsigned int _dstlen;
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bzs.bzalloc = slab_alloc_i;
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bzs.bzfree = slab_free;
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bzs.opaque = NULL;
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ret = BZ2_bzCompressInit(&bzs, level, 0, 30);
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if (ret != BZ_OK) {
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bzerr(ret);
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return (-1);
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}
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bzs.next_in = src;
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bzs.avail_in = srclen;
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bzs.next_out = dst;
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bzs.avail_out = *dstlen;
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ret = BZ2_bzCompress(&bzs, BZ_FINISH);
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if (ret == BZ_FINISH_OK) {
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BZ2_bzCompressEnd(&bzs);
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return (-1);
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}
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if (ret != BZ_STREAM_END) {
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BZ2_bzCompressEnd(&bzs);
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bzerr(ret);
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return (-1);
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}
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/* normal termination */
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*dstlen -= bzs.avail_out;
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BZ2_bzCompressEnd(&bzs);
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return (0);
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}
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int
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bzip2_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
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int level, uchar_t chdr, void *data)
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{
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bz_stream bzs;
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int ret;
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bzs.bzalloc = slab_alloc_i;
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bzs.bzfree = slab_free;
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bzs.opaque = NULL;
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ret = BZ2_bzDecompressInit(&bzs, 0, 0);
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if (ret != BZ_OK) {
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bzerr(ret);
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return (-1);
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}
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bzs.next_in = (uchar_t *)src;
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bzs.avail_in = srclen;
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bzs.next_out = dst;
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bzs.avail_out = *dstlen;
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ret = BZ2_bzDecompress(&bzs);
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if (ret == BZ_FINISH_OK) {
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BZ2_bzDecompressEnd(&bzs);
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bzerr(ret);
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return (-1);
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}
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if (ret != BZ_STREAM_END) {
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BZ2_bzDecompressEnd(&bzs);
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bzerr(ret);
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return (-1);
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}
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/* normal termination */
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*dstlen -= bzs.avail_out;
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BZ2_bzDecompressEnd(&bzs);
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return (0);
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}
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