163 lines
3.6 KiB
C
163 lines
3.6 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 <string.h>
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#include <limits.h>
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#include <utils.h>
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#include <pcompress.h>
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#include <lz4.h>
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#include <lz4hc.h>
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#include <allocator.h>
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#define LZ4_MAX_CHUNK 2147450621L
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struct lz4_params {
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int level;
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};
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void
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lz4_stats(int show)
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{
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}
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int
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lz4_buf_extra(int64_t buflen)
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{
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if (buflen > LZ4_MAX_CHUNK)
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buflen = LZ4_MAX_CHUNK;
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return (LZ4_compressBound(buflen) - buflen + sizeof(int));
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}
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void
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lz4_props(algo_props_t *data, int level, int64_t chunksize) {
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data->compress_mt_capable = 0;
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data->decompress_mt_capable = 0;
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data->buf_extra = lz4_buf_extra(chunksize);
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data->delta2_span = 100;
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}
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int
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lz4_init(void **data, int *level, int nthreads, int64_t chunksize,
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int file_version, compress_op_t op)
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{
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struct lz4_params *lzdat;
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int lev;
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if (chunksize > LZ4_MAX_CHUNK) {
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fprintf(stderr, "Max allowed chunk size for LZ4 is: %ld \n",
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LZ4_MAX_CHUNK);
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return (1);
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}
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lzdat = slab_alloc(NULL, sizeof (struct lz4_params));
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lev = *level;
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if (lev > 3) lev = 3;
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lzdat->level = lev;
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*data = lzdat;
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if (*level > 9) *level = 9;
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return (0);
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}
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int
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lz4_deinit(void **data)
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{
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struct lz4_params *lzdat = (struct lz4_params *)(*data);
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if (lzdat) {
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slab_free(NULL, lzdat);
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}
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*data = NULL;
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return (0);
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}
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int
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lz4_compress(void *src, uint64_t srclen, void *dst, uint64_t *dstlen,
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int level, uchar_t chdr, void *data)
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{
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int rv;
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struct lz4_params *lzdat = (struct lz4_params *)data;
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int _srclen = srclen;
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uchar_t *dst2;
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if (lzdat->level == 1) {
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rv = LZ4_compress(src, dst, _srclen);
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} else if (lzdat->level == 2) {
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rv = LZ4_compress(src, dst, _srclen);
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if (rv == 0 || rv > *dstlen) {
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return (-1);
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}
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dst2 = slab_alloc(NULL, rv + sizeof (int) + LZ4_compressBound(rv));
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*((int *)dst2) = htonl(rv);
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rv = LZ4_compressHC(dst, dst2 + sizeof (int), rv);
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if (rv != 0) {
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rv += sizeof (int);
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memcpy(dst, dst2, rv);
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}
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slab_free(NULL, dst2);
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} else {
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rv = LZ4_compressHC(src, dst, _srclen);
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}
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if (rv == 0) {
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return (-1);
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}
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*dstlen = rv;
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return (0);
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}
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int
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lz4_decompress(void *src, uint64_t srclen, void *dst, uint64_t *dstlen,
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int level, uchar_t chdr, void *data)
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{
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int rv;
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struct lz4_params *lzdat = (struct lz4_params *)data;
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int _dstlen = *dstlen;
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uchar_t *dst2;
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if (lzdat->level == 1 || lzdat->level == 3) {
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rv = LZ4_uncompress(src, dst, _dstlen);
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if (rv != srclen) {
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return (-1);
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}
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} else if (lzdat->level == 2) {
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int sz1;
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sz1 = ntohl(*((int *)src));
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rv = LZ4_uncompress(src + sizeof (int), dst, sz1);
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if (rv != srclen - sizeof (int)) {
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return (-1);
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}
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memcpy(src, dst, sz1);
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rv = LZ4_uncompress(src, dst, _dstlen);
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if (rv != sz1) {
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return (-1);
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}
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}
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return (0);
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}
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