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356 lines
20 KiB
356 lines
20 KiB
/* ****************************************************************** |
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* huff0 huffman codec, |
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* part of Finite State Entropy library |
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* Copyright (c) Yann Collet, Facebook, Inc. |
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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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* This source code is licensed under both the BSD-style license (found in the |
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found |
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* in the COPYING file in the root directory of this source tree). |
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* You may select, at your option, one of the above-listed licenses. |
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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 "zstd_deps.h" /* size_t */ |
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/* *** library symbols visibility *** */ |
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/* Note : when linking with -fvisibility=hidden on gcc, or by default on Visual, |
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* HUF symbols remain "private" (internal symbols for library only). |
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* Set macro FSE_DLL_EXPORT to 1 if you want HUF symbols visible on DLL interface */ |
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#if defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) && defined(__GNUC__) && (__GNUC__ >= 4) |
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# define HUF_PUBLIC_API __attribute__ ((visibility ("default"))) |
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#elif defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) /* Visual expected */ |
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# define HUF_PUBLIC_API __declspec(dllexport) |
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#elif defined(FSE_DLL_IMPORT) && (FSE_DLL_IMPORT==1) |
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# define HUF_PUBLIC_API __declspec(dllimport) /* not required, just to generate faster code (saves a function pointer load from IAT and an indirect jump) */ |
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#else |
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# define HUF_PUBLIC_API |
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#endif |
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/* ========================== */ |
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/* *** simple functions *** */ |
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/* ========================== */ |
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/* HUF_compress() : |
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* Compress content from buffer 'src', of size 'srcSize', into buffer 'dst'. |
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* 'dst' buffer must be already allocated. |
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* Compression runs faster if `dstCapacity` >= HUF_compressBound(srcSize). |
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* `srcSize` must be <= `HUF_BLOCKSIZE_MAX` == 128 KB. |
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* @return : size of compressed data (<= `dstCapacity`). |
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* Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!! |
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* if HUF_isError(return), compression failed (more details using HUF_getErrorName()) |
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*/ |
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HUF_PUBLIC_API size_t HUF_compress(void* dst, size_t dstCapacity, |
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const void* src, size_t srcSize); |
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/* HUF_decompress() : |
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* Decompress HUF data from buffer 'cSrc', of size 'cSrcSize', |
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* into already allocated buffer 'dst', of minimum size 'dstSize'. |
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* `originalSize` : **must** be the ***exact*** size of original (uncompressed) data. |
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* Note : in contrast with FSE, HUF_decompress can regenerate |
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* RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, |
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* because it knows size to regenerate (originalSize). |
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* @return : size of regenerated data (== originalSize), |
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* or an error code, which can be tested using HUF_isError() |
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*/ |
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HUF_PUBLIC_API size_t HUF_decompress(void* dst, size_t originalSize, |
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const void* cSrc, size_t cSrcSize); |
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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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HUF_PUBLIC_API size_t HUF_compressBound(size_t size); /*< maximum compressed size (worst case) */ |
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/* Error Management */ |
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HUF_PUBLIC_API unsigned HUF_isError(size_t code); /*< tells if a return value is an error code */ |
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HUF_PUBLIC_API const char* HUF_getErrorName(size_t code); /*< provides error code string (useful for debugging) */ |
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/* *** Advanced function *** */ |
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/* HUF_compress2() : |
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* Same as HUF_compress(), but offers control over `maxSymbolValue` and `tableLog`. |
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* `maxSymbolValue` must be <= HUF_SYMBOLVALUE_MAX . |
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* `tableLog` must be `<= HUF_TABLELOG_MAX` . */ |
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HUF_PUBLIC_API size_t HUF_compress2 (void* dst, size_t dstCapacity, |
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const void* src, size_t srcSize, |
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unsigned maxSymbolValue, unsigned tableLog); |
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/* HUF_compress4X_wksp() : |
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* Same as HUF_compress2(), but uses externally allocated `workSpace`. |
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* `workspace` must have minimum alignment of 4, and be at least as large as HUF_WORKSPACE_SIZE */ |
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#define HUF_WORKSPACE_SIZE ((6 << 10) + 256) |
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#define HUF_WORKSPACE_SIZE_U32 (HUF_WORKSPACE_SIZE / sizeof(U32)) |
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HUF_PUBLIC_API size_t HUF_compress4X_wksp (void* dst, size_t dstCapacity, |
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const void* src, size_t srcSize, |
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unsigned maxSymbolValue, unsigned tableLog, |
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void* workSpace, size_t wkspSize); |
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#endif /* HUF_H_298734234 */ |
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/* ****************************************************************** |
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* WARNING !! |
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* The following section contains advanced and experimental definitions |
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* which shall never be used in the context of a dynamic library, |
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* because they are not guaranteed to remain stable in the future. |
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* Only consider them in association with static linking. |
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* *****************************************************************/ |
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#if !defined(HUF_H_HUF_STATIC_LINKING_ONLY) |
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#define HUF_H_HUF_STATIC_LINKING_ONLY |
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/* *** Dependencies *** */ |
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#include "mem.h" /* U32 */ |
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#define FSE_STATIC_LINKING_ONLY |
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#include "fse.h" |
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/* *** Constants *** */ |
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#define HUF_TABLELOG_MAX 12 /* max runtime value of tableLog (due to static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */ |
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#define HUF_TABLELOG_DEFAULT 11 /* default tableLog value when none 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 when incompressible is 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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/* this is a private definition, just exposed for allocation and strict aliasing purpose. never EVER access its members directly */ |
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struct HUF_CElt_s { |
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U16 val; |
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BYTE nbBits; |
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}; /* typedef'd to HUF_CElt */ |
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typedef struct HUF_CElt_s HUF_CElt; /* consider it an incomplete type */ |
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#define HUF_CTABLE_SIZE_U32(maxSymbolValue) ((maxSymbolValue)+1) /* Use tables of U32, for proper alignment */ |
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#define HUF_CTABLE_SIZE(maxSymbolValue) (HUF_CTABLE_SIZE_U32(maxSymbolValue) * sizeof(U32)) |
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#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \ |
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HUF_CElt name[HUF_CTABLE_SIZE_U32(maxSymbolValue)] /* 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_DTABLEX1(DTable, maxTableLog) \ |
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HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1) * 0x01000001) } |
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#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \ |
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HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog) * 0x01000001) } |
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/* **************************************** |
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* Advanced decompression functions |
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******************************************/ |
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size_t HUF_decompress4X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< single-symbol decoder */ |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< double-symbols decoder */ |
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#endif |
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size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< decodes RLE and uncompressed */ |
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size_t HUF_decompress4X_hufOnly(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< considers RLE and uncompressed as errors */ |
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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, size_t wkspSize); /*< considers RLE and uncompressed as errors */ |
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size_t HUF_decompress4X1_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< single-symbol decoder */ |
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size_t HUF_decompress4X1_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /*< single-symbol decoder */ |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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size_t HUF_decompress4X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< double-symbols decoder */ |
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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, size_t wkspSize); /*< double-symbols decoder */ |
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#endif |
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/* **************************************** |
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* HUF detailed API |
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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() (exposed within "fse.h") |
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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() |
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* 5. encode the data stream using HUF_compress4X_usingCTable() |
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* |
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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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unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue); |
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size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits); /* @return : maxNbBits; CTable and count can overlap. In which case, CTable will overwrite count content */ |
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size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog); |
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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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size_t HUF_estimateCompressedSize(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue); |
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int HUF_validateCTable(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue); |
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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, 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, |
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const void* src, size_t srcSize, |
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unsigned maxSymbolValue, unsigned tableLog, |
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void* workSpace, size_t wkspSize, /*< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */ |
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HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2); |
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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 its size must be >= HUF_CTABLE_WORKSPACE_SIZE. |
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*/ |
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#define HUF_CTABLE_WORKSPACE_SIZE_U32 (2*HUF_SYMBOLVALUE_MAX +1 +1) |
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#define HUF_CTABLE_WORKSPACE_SIZE (HUF_CTABLE_WORKSPACE_SIZE_U32 * sizeof(unsigned)) |
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size_t HUF_buildCTable_wksp (HUF_CElt* tree, |
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const unsigned* count, U32 maxSymbolValue, U32 maxNbBits, |
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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(BYTE* huffWeight, size_t hwSize, |
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U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr, |
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const void* src, size_t srcSize); |
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/*! HUF_readStats_wksp() : |
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* Same as HUF_readStats() but takes an external workspace which must be |
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* 4-byte aligned and its size must be >= HUF_READ_STATS_WORKSPACE_SIZE. |
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* If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0. |
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*/ |
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#define HUF_READ_STATS_WORKSPACE_SIZE_U32 FSE_DECOMPRESS_WKSP_SIZE_U32(6, HUF_TABLELOG_MAX-1) |
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#define HUF_READ_STATS_WORKSPACE_SIZE (HUF_READ_STATS_WORKSPACE_SIZE_U32 * sizeof(unsigned)) |
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size_t HUF_readStats_wksp(BYTE* huffWeight, size_t hwSize, |
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U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr, |
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const void* src, size_t srcSize, |
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void* workspace, size_t wkspSize, |
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int bmi2); |
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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 (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize, unsigned *hasZeroWeights); |
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/* HUF_getNbBits() : |
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* Read nbBits from CTable symbolTable, for symbol `symbolValue` presumed <= HUF_SYMBOLVALUE_MAX |
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* Note 1 : is not inlined, as HUF_CElt definition is private |
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* Note 2 : const void* used, so that it can provide a statically allocated table as argument (which uses type U32) */ |
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U32 HUF_getNbBits(const void* symbolTable, U32 symbolValue); |
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/* |
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* HUF_decompress() does the following: |
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* 1. select the decompression algorithm (X1, X2) based on pre-computed heuristics |
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* 2. build Huffman table from save, using HUF_readDTableX?() |
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* 3. decode 1 or 4 segments in parallel using HUF_decompress?X?_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-computed metrics. |
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* @return : 0==HUF_decompress4X1, 1==HUF_decompress4X2 . |
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* Assumption : 0 < dstSize <= 128 KB */ |
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U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize); |
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/* |
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* The minimum workspace size for the `workSpace` used in |
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* HUF_readDTableX1_wksp() and HUF_readDTableX2_wksp(). |
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* |
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* The space used depends on HUF_TABLELOG_MAX, ranging from ~1500 bytes when |
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* HUF_TABLE_LOG_MAX=12 to ~1850 bytes when HUF_TABLE_LOG_MAX=15. |
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* Buffer overflow errors may potentially occur if code modifications result in |
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* a required workspace size greater than that specified in the following |
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* macro. |
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*/ |
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#define HUF_DECOMPRESS_WORKSPACE_SIZE ((2 << 10) + (1 << 9)) |
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#define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32)) |
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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_readDTableX1 (HUF_DTable* DTable, const void* src, size_t srcSize); |
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size_t HUF_readDTableX1_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize); |
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#endif |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize); |
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size_t HUF_readDTableX2_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize); |
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#endif |
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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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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_decompress4X1_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); |
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#endif |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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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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#endif |
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/* ====================== */ |
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/* single stream variants */ |
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/* ====================== */ |
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size_t HUF_compress1X (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog); |
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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, size_t wkspSize); /*< `workSpace` must be a table of at least HUF_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, |
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const void* src, size_t srcSize, |
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unsigned maxSymbolValue, unsigned tableLog, |
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void* workSpace, size_t wkspSize, /*< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */ |
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HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2); |
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size_t HUF_decompress1X1 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */ |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */ |
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#endif |
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size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); |
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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 wkspSize); |
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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_decompress1X1_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< single-symbol decoder */ |
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size_t HUF_decompress1X1_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /*< single-symbol decoder */ |
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#endif |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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size_t HUF_decompress1X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /*< double-symbols decoder */ |
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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, size_t wkspSize); /*< double-symbols decoder */ |
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#endif |
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size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); /*< automatic selection of sing or double symbol decoder, based on DTable */ |
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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_decompress1X1_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); |
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#endif |
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#ifndef HUF_FORCE_DECOMPRESS_X1 |
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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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#endif |
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/* BMI2 variants. |
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* If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0. |
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*/ |
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size_t HUF_decompress1X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2); |
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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_decompress1X1_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2); |
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#endif |
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size_t HUF_decompress4X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2); |
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size_t HUF_decompress4X_hufOnly_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2); |
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#ifndef HUF_FORCE_DECOMPRESS_X2 |
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size_t HUF_readDTableX1_wksp_bmi2(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize, int bmi2); |
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#endif |
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#endif /* HUF_STATIC_LINKING_ONLY */ |
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