151 lines
3.1 KiB
C
151 lines
3.1 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 <stdio.h>
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#include <sys/types.h>
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#include <strings.h>
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#include <zlib.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_ui(void *p, unsigned int items, unsigned 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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int
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zlib_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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void
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zlib_stats(int show)
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{
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}
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static
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void zerr(int ret)
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{
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switch (ret) {
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case Z_ERRNO:
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perror(" ");
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break;
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case Z_STREAM_ERROR:
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fprintf(stderr, "Zlib: Invalid compression level\n");
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break;
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case Z_DATA_ERROR:
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fprintf(stderr, "Zlib: Invalid or incomplete deflate data\n");
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break;
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case Z_MEM_ERROR:
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fprintf(stderr, "Zlib: Out of memory\n");
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break;
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case Z_VERSION_ERROR:
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fprintf(stderr, "Zlib: Version mismatch!\n");
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break;
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default:
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fprintf(stderr, "Zlib: Unknown error code: %d\n", ret);
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}
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}
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int
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zlib_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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z_stream zs;
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int ret;
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zs.next_in = src;
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zs.avail_in = srclen;
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zs.next_out = dst;
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zs.avail_out = *dstlen;
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zs.zalloc = slab_alloc_ui;
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zs.zfree = slab_free;
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zs.opaque = NULL;
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ret = deflateInit(&zs, level);
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if (ret != Z_OK) {
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zerr(ret);
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return (-1);
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}
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ret = deflate(&zs, Z_FINISH);
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if (ret != Z_STREAM_END) {
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deflateEnd(&zs);
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if (ret == Z_OK)
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zerr(Z_BUF_ERROR);
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else
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zerr(ret);
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return (-1);
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}
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*dstlen = zs.total_out;
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ret = deflateEnd(&zs);
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if (ret != Z_OK) {
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zerr(ret);
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return (-1);
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}
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return (0);
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}
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int
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zlib_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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z_stream zs;
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int err;
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bzero(&zs, sizeof (zs));
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zs.next_in = (unsigned char *)src;
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zs.avail_in = srclen;
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zs.next_out = dst;
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zs.avail_out = *dstlen;
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zs.zalloc = slab_alloc_ui;
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zs.zfree = slab_free;
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zs.opaque = NULL;
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if ((err = inflateInit(&zs)) != Z_OK) {
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zerr(err);
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return (-1);
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}
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if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
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inflateEnd(&zs);
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if (err == Z_OK)
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zerr(Z_BUF_ERROR);
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else
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zerr(err);
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return (-1);
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}
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*dstlen = zs.total_out;
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inflateEnd(&zs);
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return (0);
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}
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