137 lines
3.1 KiB
C
137 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 <sys/types.h>
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#include <stdio.h>
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#include <strings.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 <lzfx.h>
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#include <allocator.h>
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struct lzfx_params {
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uint32_t htab_bits;
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};
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void
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lz_fx_stats(int show)
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{
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}
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void
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lz_fx_props(algo_props_t *data, int level, int64_t chunksize) {
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data->delta2_stride = 50;
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}
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int
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lz_fx_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 lzfx_params *lzdat;
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int lev;
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if (chunksize > UINT_MAX) {
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fprintf(stderr, "Chunk size too big for LZFX.\n");
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return (1);
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}
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lzdat = slab_alloc(NULL, sizeof (struct lzfx_params));
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lev = *level;
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if (lev > 5) lev = 5;
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lzdat->htab_bits = 16 + (lev-1);
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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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lz_fx_deinit(void **data)
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{
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struct lzfx_params *lzdat = (struct lzfx_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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static void
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lz_fx_err(int err)
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{
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switch (err) {
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case LZFX_ESIZE:
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fprintf(stderr, "LZFX: Output buffer too small.\n");
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break;
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case LZFX_ECORRUPT:
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fprintf(stderr, "LZFX: Corrupt data for decompression.\n");
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break;
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case LZFX_EARGS:
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fprintf(stderr, "LZFX: Invalid arguments.\n");
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break;
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case LZFX_ENOMEM:
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fprintf(stderr, "LZFX: Out of memory when allocating hashtable.\n");
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break;
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default:
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fprintf(stderr, "LZFX: Unknown error code: %d\n", err);
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}
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}
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int
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lz_fx_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 lzfx_params *lzdat = (struct lzfx_params *)data;
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unsigned int _srclen = srclen;
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unsigned int _dstlen = *dstlen;
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rv = lzfx_compress(src, _srclen, dst, &_dstlen, lzdat->htab_bits);
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if (rv != 0) {
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if (rv != LZFX_ESIZE)
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lz_fx_err(rv);
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return (-1);
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}
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*dstlen = _dstlen;
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return (0);
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}
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int
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lz_fx_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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unsigned int _srclen = srclen;
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unsigned int _dstlen = *dstlen;
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rv = lzfx_decompress(src, _srclen, dst, &_dstlen);
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if (rv != 0) {
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lz_fx_err(rv);
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return (-1);
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}
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*dstlen = _dstlen;
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return (0);
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}
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