a1825a2305
Restructure compression functions to take chunk flag as argument. Add missing error flag printing in LZMA. Only create enough threads as needed by chunk size and file size. Minor cleanups and variable name changes.
152 lines
3.2 KiB
C
152 lines
3.2 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 2.1 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 <utils.h>
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#include <pcompress.h>
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#include <allocator.h>
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#include <Ppmd8.h>
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/*
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* PPMd model order to working set memory size mappings.
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*/
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unsigned int ppmd8_mem_sz[] = {
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(16 << 20),
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(16 << 20),
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(32 << 20),
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(32 << 20),
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(64 << 20),
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(64 << 20),
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(100 << 20),
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(100 << 20),
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(400 << 20),
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(400 << 20),
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(700 << 20),
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(700 << 20),
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(700 << 20),
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(1200 << 20),
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(1200 << 20)
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};
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static ISzAlloc g_Alloc = {
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slab_alloc,
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slab_free,
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NULL
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};
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void
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ppmd_stats(int show)
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{
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}
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int
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ppmd_init(void **data, int *level, ssize_t chunksize)
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{
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CPpmd8 *_ppmd;
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_ppmd = (CPpmd8 *)slab_alloc(NULL, sizeof (CPpmd8));
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if (!_ppmd)
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return (-1);
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/* Levels 0 - 14 correspond to PPMd model orders 0 - 14. */
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if (*level > 14) *level = 14;
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_ppmd->Order = *level;
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_ppmd->Base = 0;
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_ppmd->Size = 0;
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if (!Ppmd8_Alloc(_ppmd, ppmd8_mem_sz[*level], &g_Alloc)) {
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fprintf(stderr, "Out of memory.\n");
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return (-1);
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}
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Ppmd8_Construct(_ppmd);
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*data = _ppmd;
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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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ppmd_deinit(void **data)
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{
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CPpmd8 *_ppmd = (CPpmd8 *)(*data);
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if (_ppmd) {
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Ppmd8_Free(_ppmd, &g_Alloc);
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slab_free(NULL, _ppmd);
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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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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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{
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CPpmd8 *_ppmd = (CPpmd8 *)data;
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uchar_t *_src = (uchar_t *)src;
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UInt32 i;
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Ppmd8_RangeEnc_Init(_ppmd);
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Ppmd8_Init(_ppmd, _ppmd->Order, PPMD8_RESTORE_METHOD_RESTART);
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_ppmd->buf = (Byte *)dst;
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_ppmd->bufLen = *dstlen;
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_ppmd->bufUsed = 0;
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Ppmd8_EncodeBuffer(_ppmd, _src, srclen);
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Ppmd8_EncodeSymbol(_ppmd, -1);
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Ppmd8_RangeEnc_FlushData(_ppmd);
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*dstlen = _ppmd->bufUsed;
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return (0);
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}
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int
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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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{
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CPpmd8 *_ppmd = (CPpmd8 *)data;
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Byte *_src = (Byte *)src;
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Byte *_dst = (Byte *)dst;
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size_t i;
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int res;
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if (*((char *)_src) < 2)
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return (-1);
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_ppmd->buf = (Byte *)_src;
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_ppmd->bufLen = srclen;
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_ppmd->bufUsed = 0;
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Ppmd8_RangeDec_Init(_ppmd);
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Ppmd8_Init(_ppmd, _ppmd->Order, PPMD8_RESTORE_METHOD_RESTART);
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res = Ppmd8_DecodeToBuffer(_ppmd, _dst, *dstlen, &i);
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if (res < 0 && res != -1) {
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if (Ppmd8_DecodeSymbol(_ppmd) != -1)
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return (-1);
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i++;
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}
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if (i < *dstlen)
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return (-1);
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return (0);
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}
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