213 lines
12 KiB
C
213 lines
12 KiB
C
/*
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* Huffman coder, part of New Generation Entropy library
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* header file
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* Copyright (C) 2013-2016, Yann Collet.
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*
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* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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*
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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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*
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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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*
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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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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation. This program is dual-licensed; you may select
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* either version 2 of the GNU General Public License ("GPL") or BSD license
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* ("BSD").
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*
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* You can contact the author at :
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* - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
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*/
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#ifndef HUF_H_298734234
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#define HUF_H_298734234
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/* *** Dependencies *** */
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#include <linux/types.h> /* size_t */
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/* *** Tool functions *** */
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#define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */
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size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */
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/* Error Management */
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unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */
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/* *** Advanced function *** */
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/** HUF_compress4X_wksp() :
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* Same as HUF_compress2(), but uses externally allocated `workSpace`, which must be a table of >= 1024 unsigned */
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size_t HUF_compress4X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
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size_t wkspSize); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
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/* *** Dependencies *** */
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#include "mem.h" /* U32 */
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/* *** Constants *** */
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#define HUF_TABLELOG_MAX 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
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#define HUF_TABLELOG_DEFAULT 11 /* tableLog by default, when not specified */
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#define HUF_SYMBOLVALUE_MAX 255
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#define HUF_TABLELOG_ABSOLUTEMAX 15 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
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#if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX)
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#error "HUF_TABLELOG_MAX is too large !"
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#endif
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/* ****************************************
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* Static allocation
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******************************************/
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/* HUF buffer bounds */
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#define HUF_CTABLEBOUND 129
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#define HUF_BLOCKBOUND(size) (size + (size >> 8) + 8) /* only true if incompressible pre-filtered with fast heuristic */
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#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
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/* static allocation of HUF's Compression Table */
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#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
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U32 name##hb[maxSymbolValue + 1]; \
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void *name##hv = &(name##hb); \
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HUF_CElt *name = (HUF_CElt *)(name##hv) /* no final ; */
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/* static allocation of HUF's DTable */
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typedef U32 HUF_DTable;
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#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1 << (maxTableLog)))
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#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = {((U32)((maxTableLog)-1) * 0x01000001)}
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#define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = {((U32)(maxTableLog)*0x01000001)}
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/* The workspace must have alignment at least 4 and be at least this large */
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#define HUF_COMPRESS_WORKSPACE_SIZE (6 << 10)
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#define HUF_COMPRESS_WORKSPACE_SIZE_U32 (HUF_COMPRESS_WORKSPACE_SIZE / sizeof(U32))
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/* The workspace must have alignment at least 4 and be at least this large */
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#define HUF_DECOMPRESS_WORKSPACE_SIZE (3 << 10)
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#define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32))
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/* ****************************************
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* Advanced decompression functions
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******************************************/
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size_t HUF_decompress4X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize); /**< decodes RLE and uncompressed */
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size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
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size_t workspaceSize); /**< considers RLE and uncompressed as errors */
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size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
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size_t workspaceSize); /**< single-symbol decoder */
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size_t HUF_decompress4X4_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
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size_t workspaceSize); /**< double-symbols decoder */
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/* ****************************************
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* HUF detailed API
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******************************************/
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/*!
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HUF_compress() does the following:
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1. count symbol occurrence from source[] into table count[] using FSE_count()
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2. (optional) refine tableLog using HUF_optimalTableLog()
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3. build Huffman table from count using HUF_buildCTable()
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4. save Huffman table to memory buffer using HUF_writeCTable_wksp()
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5. encode the data stream using HUF_compress4X_usingCTable()
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The following API allows targeting specific sub-functions for advanced tasks.
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For example, it's possible to compress several blocks using the same 'CTable',
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or to save and regenerate 'CTable' using external methods.
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*/
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/* FSE_count() : find it within "fse.h" */
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unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
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typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */
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size_t HUF_writeCTable_wksp(void *dst, size_t maxDstSize, const HUF_CElt *CTable, unsigned maxSymbolValue, unsigned huffLog, void *workspace, size_t workspaceSize);
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size_t HUF_compress4X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable);
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typedef enum {
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HUF_repeat_none, /**< Cannot use the previous table */
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HUF_repeat_check, /**< Can use the previous table but it must be checked. Note : The previous table must have been constructed by HUF_compress{1,
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4}X_repeat */
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HUF_repeat_valid /**< Can use the previous table and it is assumed to be valid */
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} HUF_repeat;
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/** HUF_compress4X_repeat() :
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* Same as HUF_compress4X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
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* If it uses hufTable it does not modify hufTable or repeat.
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* If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
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* If preferRepeat then the old table will always be used if valid. */
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size_t HUF_compress4X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
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size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat,
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int preferRepeat); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
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/** HUF_buildCTable_wksp() :
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* Same as HUF_buildCTable(), but using externally allocated scratch buffer.
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* `workSpace` must be aligned on 4-bytes boundaries, and be at least as large as a table of 1024 unsigned.
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*/
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size_t HUF_buildCTable_wksp(HUF_CElt *tree, const U32 *count, U32 maxSymbolValue, U32 maxNbBits, void *workSpace, size_t wkspSize);
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/*! HUF_readStats() :
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Read compact Huffman tree, saved by HUF_writeCTable().
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`huffWeight` is destination buffer.
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@return : size read from `src` , or an error Code .
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Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */
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size_t HUF_readStats_wksp(BYTE *huffWeight, size_t hwSize, U32 *rankStats, U32 *nbSymbolsPtr, U32 *tableLogPtr, const void *src, size_t srcSize,
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void *workspace, size_t workspaceSize);
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/** HUF_readCTable() :
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* Loading a CTable saved with HUF_writeCTable() */
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size_t HUF_readCTable_wksp(HUF_CElt *CTable, unsigned maxSymbolValue, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
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/*
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HUF_decompress() does the following:
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1. select the decompression algorithm (X2, X4) based on pre-computed heuristics
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2. build Huffman table from save, using HUF_readDTableXn()
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3. decode 1 or 4 segments in parallel using HUF_decompressSXn_usingDTable
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*/
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/** HUF_selectDecoder() :
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* Tells which decoder is likely to decode faster,
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* based on a set of pre-determined metrics.
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* @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 .
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* Assumption : 0 < cSrcSize < dstSize <= 128 KB */
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U32 HUF_selectDecoder(size_t dstSize, size_t cSrcSize);
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size_t HUF_readDTableX2_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
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size_t HUF_readDTableX4_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
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size_t HUF_decompress4X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
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size_t HUF_decompress4X2_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
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size_t HUF_decompress4X4_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
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/* single stream variants */
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size_t HUF_compress1X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
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size_t wkspSize); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
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size_t HUF_compress1X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable);
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/** HUF_compress1X_repeat() :
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* Same as HUF_compress1X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
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* If it uses hufTable it does not modify hufTable or repeat.
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* If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
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* If preferRepeat then the old table will always be used if valid. */
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size_t HUF_compress1X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
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size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat,
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int preferRepeat); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
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size_t HUF_decompress1X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize);
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size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
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size_t workspaceSize); /**< single-symbol decoder */
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size_t HUF_decompress1X4_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
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size_t workspaceSize); /**< double-symbols decoder */
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size_t HUF_decompress1X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize,
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const HUF_DTable *DTable); /**< automatic selection of sing or double symbol decoder, based on DTable */
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size_t HUF_decompress1X2_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
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size_t HUF_decompress1X4_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
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#endif /* HUF_H_298734234 */
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