101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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zstdhc - high compression variant
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Header File - Experimental API, static linking only
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Copyright (C) 2015, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- zstd source repository : http://www.zstd.net
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*/
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#pragma once
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/* *************************************
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* Includes
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***************************************/
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#include "mem.h"
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#include "zstdhc.h"
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/* *************************************
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* Types
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***************************************/
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typedef struct
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{
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U32 windowLog; /* largest match distance : impact decompression buffer size */
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U32 chainLog; /* full search distance : larger == more compression, slower, more memory*/
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U32 hashLog; /* dispatch table : larger == more memory, faster*/
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U32 searchLog; /* nb of searches : larger == more compression, slower*/
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} ZSTD_HC_parameters;
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/* *************************************
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* Functions
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***************************************/
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/** ZSTD_HC_compress_advanced
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* Same as ZSTD_HC_compressCCtx(), but can fine-tune each compression parameter */
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size_t ZSTD_HC_compress_advanced (ZSTD_HC_CCtx* ctx,
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void* dst, size_t maxDstSize,
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const void* src, size_t srcSize,
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ZSTD_HC_parameters params);
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/* *************************************
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* Pre-defined compression levels
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***************************************/
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#define ZSTD_HC_MAX_CLEVEL 20
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static const ZSTD_HC_parameters ZSTD_HC_defaultParameters[ZSTD_HC_MAX_CLEVEL+1] = {
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/* W, C, H, S */
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{ 18, 4, 12, 1 }, /* 0 - should never be used */
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{ 18, 11, 14, 1 }, /* 1 */
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{ 20, 13, 16, 2 }, /* 2 */
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{ 20, 19, 20, 2 }, /* 3 */
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{ 21, 19, 20, 4 }, /* 4 */
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{ 21, 20, 21, 4 }, /* 5 */
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{ 21, 20, 22, 5 }, /* 6 */
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{ 21, 20, 22, 6 }, /* 7 */
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{ 21, 20, 22, 7 }, /* 8 */
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{ 21, 21, 23, 7 }, /* 9 */
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{ 21, 21, 23, 8 }, /*10 */
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{ 21, 21, 23, 9 }, /*11 */
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{ 21, 21, 23, 10 }, /*12 */
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{ 22, 22, 24, 9 }, /*13 */
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{ 22, 22, 24, 10 }, /*14 */
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{ 23, 23, 23, 10 }, /*15 */
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{ 24, 23, 22, 11 }, /*16 */
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{ 24, 24, 23, 11 }, /*17 */
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{ 24, 24, 22, 12 }, /*18 */
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{ 24, 24, 22, 13 }, /*19 */
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{ 25, 25, 25, 22 }, /*20 - ultra-slow */
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};
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#if defined (__cplusplus)
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}
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#endif
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