287 lines
14 KiB
C++
287 lines
14 KiB
C++
/* ******************************************************************
|
|
* huff0 huffman codec,
|
|
* part of Finite State Entropy library
|
|
* Copyright (c) Meta Platforms, Inc. and affiliates.
|
|
*
|
|
* You can contact the author at :
|
|
* - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
|
|
*
|
|
* This source code is licensed under both the BSD-style license (found in the
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
|
* in the COPYING file in the root directory of this source tree).
|
|
* You may select, at your option, one of the above-listed licenses.
|
|
****************************************************************** */
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef HUF_H_298734234
|
|
#define HUF_H_298734234
|
|
|
|
/* *** Dependencies *** */
|
|
#include "zstd_deps.h" /* size_t */
|
|
#include "mem.h" /* U32 */
|
|
#define FSE_STATIC_LINKING_ONLY
|
|
#include "fse.h"
|
|
|
|
|
|
/* *** Tool functions *** */
|
|
#define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */
|
|
size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */
|
|
|
|
/* Error Management */
|
|
unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */
|
|
const char* HUF_getErrorName(size_t code); /**< provides error code string (useful for debugging) */
|
|
|
|
|
|
#define HUF_WORKSPACE_SIZE ((8 << 10) + 512 /* sorting scratch space */)
|
|
#define HUF_WORKSPACE_SIZE_U64 (HUF_WORKSPACE_SIZE / sizeof(U64))
|
|
|
|
/* *** Constants *** */
|
|
#define HUF_TABLELOG_MAX 12 /* max runtime value of tableLog (due to static allocation); can be modified up to HUF_TABLELOG_ABSOLUTEMAX */
|
|
#define HUF_TABLELOG_DEFAULT 11 /* default tableLog value when none specified */
|
|
#define HUF_SYMBOLVALUE_MAX 255
|
|
|
|
#define HUF_TABLELOG_ABSOLUTEMAX 12 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
|
|
#if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX)
|
|
# error "HUF_TABLELOG_MAX is too large !"
|
|
#endif
|
|
|
|
|
|
/* ****************************************
|
|
* Static allocation
|
|
******************************************/
|
|
/* HUF buffer bounds */
|
|
#define HUF_CTABLEBOUND 129
|
|
#define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true when incompressible is pre-filtered with fast heuristic */
|
|
#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
|
|
|
|
/* static allocation of HUF's Compression Table */
|
|
/* this is a private definition, just exposed for allocation and strict aliasing purpose. never EVER access its members directly */
|
|
typedef size_t HUF_CElt; /* consider it an incomplete type */
|
|
#define HUF_CTABLE_SIZE_ST(maxSymbolValue) ((maxSymbolValue)+2) /* Use tables of size_t, for proper alignment */
|
|
#define HUF_CTABLE_SIZE(maxSymbolValue) (HUF_CTABLE_SIZE_ST(maxSymbolValue) * sizeof(size_t))
|
|
#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
|
|
HUF_CElt name[HUF_CTABLE_SIZE_ST(maxSymbolValue)] /* no final ; */
|
|
|
|
/* static allocation of HUF's DTable */
|
|
typedef U32 HUF_DTable;
|
|
#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog)))
|
|
#define HUF_CREATE_STATIC_DTABLEX1(DTable, maxTableLog) \
|
|
HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1) * 0x01000001) }
|
|
#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \
|
|
HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog) * 0x01000001) }
|
|
|
|
|
|
/* ****************************************
|
|
* Advanced decompression functions
|
|
******************************************/
|
|
|
|
/**
|
|
* Huffman flags bitset.
|
|
* For all flags, 0 is the default value.
|
|
*/
|
|
typedef enum {
|
|
/**
|
|
* If compiled with DYNAMIC_BMI2: Set flag only if the CPU supports BMI2 at runtime.
|
|
* Otherwise: Ignored.
|
|
*/
|
|
HUF_flags_bmi2 = (1 << 0),
|
|
/**
|
|
* If set: Test possible table depths to find the one that produces the smallest header + encoded size.
|
|
* If unset: Use heuristic to find the table depth.
|
|
*/
|
|
HUF_flags_optimalDepth = (1 << 1),
|
|
/**
|
|
* If set: If the previous table can encode the input, always reuse the previous table.
|
|
* If unset: If the previous table can encode the input, reuse the previous table if it results in a smaller output.
|
|
*/
|
|
HUF_flags_preferRepeat = (1 << 2),
|
|
/**
|
|
* If set: Sample the input and check if the sample is uncompressible, if it is then don't attempt to compress.
|
|
* If unset: Always histogram the entire input.
|
|
*/
|
|
HUF_flags_suspectUncompressible = (1 << 3),
|
|
/**
|
|
* If set: Don't use assembly implementations
|
|
* If unset: Allow using assembly implementations
|
|
*/
|
|
HUF_flags_disableAsm = (1 << 4),
|
|
/**
|
|
* If set: Don't use the fast decoding loop, always use the fallback decoding loop.
|
|
* If unset: Use the fast decoding loop when possible.
|
|
*/
|
|
HUF_flags_disableFast = (1 << 5)
|
|
} HUF_flags_e;
|
|
|
|
|
|
/* ****************************************
|
|
* HUF detailed API
|
|
* ****************************************/
|
|
#define HUF_OPTIMAL_DEPTH_THRESHOLD ZSTD_btultra
|
|
|
|
/*! HUF_compress() does the following:
|
|
* 1. count symbol occurrence from source[] into table count[] using FSE_count() (exposed within "fse.h")
|
|
* 2. (optional) refine tableLog using HUF_optimalTableLog()
|
|
* 3. build Huffman table from count using HUF_buildCTable()
|
|
* 4. save Huffman table to memory buffer using HUF_writeCTable()
|
|
* 5. encode the data stream using HUF_compress4X_usingCTable()
|
|
*
|
|
* The following API allows targeting specific sub-functions for advanced tasks.
|
|
* For example, it's possible to compress several blocks using the same 'CTable',
|
|
* or to save and regenerate 'CTable' using external methods.
|
|
*/
|
|
unsigned HUF_minTableLog(unsigned symbolCardinality);
|
|
unsigned HUF_cardinality(const unsigned* count, unsigned maxSymbolValue);
|
|
unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, void* workSpace,
|
|
size_t wkspSize, HUF_CElt* table, const unsigned* count, int flags); /* table is used as scratch space for building and testing tables, not a return value */
|
|
size_t HUF_writeCTable_wksp(void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog, void* workspace, size_t workspaceSize);
|
|
size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable, int flags);
|
|
size_t HUF_estimateCompressedSize(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue);
|
|
int HUF_validateCTable(const HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue);
|
|
|
|
typedef enum {
|
|
HUF_repeat_none, /**< Cannot use the previous table */
|
|
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 */
|
|
HUF_repeat_valid /**< Can use the previous table and it is assumed to be valid */
|
|
} HUF_repeat;
|
|
|
|
/** HUF_compress4X_repeat() :
|
|
* Same as HUF_compress4X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
|
|
* If it uses hufTable it does not modify hufTable or repeat.
|
|
* If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
|
|
* If preferRepeat then the old table will always be used if valid.
|
|
* If suspectUncompressible then some sampling checks will be run to potentially skip huffman coding */
|
|
size_t HUF_compress4X_repeat(void* dst, size_t dstSize,
|
|
const void* src, size_t srcSize,
|
|
unsigned maxSymbolValue, unsigned tableLog,
|
|
void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */
|
|
HUF_CElt* hufTable, HUF_repeat* repeat, int flags);
|
|
|
|
/** HUF_buildCTable_wksp() :
|
|
* Same as HUF_buildCTable(), but using externally allocated scratch buffer.
|
|
* `workSpace` must be aligned on 4-bytes boundaries, and its size must be >= HUF_CTABLE_WORKSPACE_SIZE.
|
|
*/
|
|
#define HUF_CTABLE_WORKSPACE_SIZE_U32 ((4 * (HUF_SYMBOLVALUE_MAX + 1)) + 192)
|
|
#define HUF_CTABLE_WORKSPACE_SIZE (HUF_CTABLE_WORKSPACE_SIZE_U32 * sizeof(unsigned))
|
|
size_t HUF_buildCTable_wksp (HUF_CElt* tree,
|
|
const unsigned* count, U32 maxSymbolValue, U32 maxNbBits,
|
|
void* workSpace, size_t wkspSize);
|
|
|
|
/*! HUF_readStats() :
|
|
* Read compact Huffman tree, saved by HUF_writeCTable().
|
|
* `huffWeight` is destination buffer.
|
|
* @return : size read from `src` , or an error Code .
|
|
* Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */
|
|
size_t HUF_readStats(BYTE* huffWeight, size_t hwSize,
|
|
U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr,
|
|
const void* src, size_t srcSize);
|
|
|
|
/*! HUF_readStats_wksp() :
|
|
* Same as HUF_readStats() but takes an external workspace which must be
|
|
* 4-byte aligned and its size must be >= HUF_READ_STATS_WORKSPACE_SIZE.
|
|
* If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0.
|
|
*/
|
|
#define HUF_READ_STATS_WORKSPACE_SIZE_U32 FSE_DECOMPRESS_WKSP_SIZE_U32(6, HUF_TABLELOG_MAX-1)
|
|
#define HUF_READ_STATS_WORKSPACE_SIZE (HUF_READ_STATS_WORKSPACE_SIZE_U32 * sizeof(unsigned))
|
|
size_t HUF_readStats_wksp(BYTE* huffWeight, size_t hwSize,
|
|
U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr,
|
|
const void* src, size_t srcSize,
|
|
void* workspace, size_t wkspSize,
|
|
int flags);
|
|
|
|
/** HUF_readCTable() :
|
|
* Loading a CTable saved with HUF_writeCTable() */
|
|
size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize, unsigned *hasZeroWeights);
|
|
|
|
/** HUF_getNbBitsFromCTable() :
|
|
* Read nbBits from CTable symbolTable, for symbol `symbolValue` presumed <= HUF_SYMBOLVALUE_MAX
|
|
* Note 1 : If symbolValue > HUF_readCTableHeader(symbolTable).maxSymbolValue, returns 0
|
|
* Note 2 : is not inlined, as HUF_CElt definition is private
|
|
*/
|
|
U32 HUF_getNbBitsFromCTable(const HUF_CElt* symbolTable, U32 symbolValue);
|
|
|
|
typedef struct {
|
|
BYTE tableLog;
|
|
BYTE maxSymbolValue;
|
|
BYTE unused[sizeof(size_t) - 2];
|
|
} HUF_CTableHeader;
|
|
|
|
/** HUF_readCTableHeader() :
|
|
* @returns The header from the CTable specifying the tableLog and the maxSymbolValue.
|
|
*/
|
|
HUF_CTableHeader HUF_readCTableHeader(HUF_CElt const* ctable);
|
|
|
|
/*
|
|
* HUF_decompress() does the following:
|
|
* 1. select the decompression algorithm (X1, X2) based on pre-computed heuristics
|
|
* 2. build Huffman table from save, using HUF_readDTableX?()
|
|
* 3. decode 1 or 4 segments in parallel using HUF_decompress?X?_usingDTable()
|
|
*/
|
|
|
|
/** HUF_selectDecoder() :
|
|
* Tells which decoder is likely to decode faster,
|
|
* based on a set of pre-computed metrics.
|
|
* @return : 0==HUF_decompress4X1, 1==HUF_decompress4X2 .
|
|
* Assumption : 0 < dstSize <= 128 KB */
|
|
U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize);
|
|
|
|
/**
|
|
* The minimum workspace size for the `workSpace` used in
|
|
* HUF_readDTableX1_wksp() and HUF_readDTableX2_wksp().
|
|
*
|
|
* The space used depends on HUF_TABLELOG_MAX, ranging from ~1500 bytes when
|
|
* HUF_TABLE_LOG_MAX=12 to ~1850 bytes when HUF_TABLE_LOG_MAX=15.
|
|
* Buffer overflow errors may potentially occur if code modifications result in
|
|
* a required workspace size greater than that specified in the following
|
|
* macro.
|
|
*/
|
|
#define HUF_DECOMPRESS_WORKSPACE_SIZE ((2 << 10) + (1 << 9))
|
|
#define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32))
|
|
|
|
|
|
/* ====================== */
|
|
/* single stream variants */
|
|
/* ====================== */
|
|
|
|
size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable, int flags);
|
|
/** HUF_compress1X_repeat() :
|
|
* Same as HUF_compress1X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
|
|
* If it uses hufTable it does not modify hufTable or repeat.
|
|
* If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
|
|
* If preferRepeat then the old table will always be used if valid.
|
|
* If suspectUncompressible then some sampling checks will be run to potentially skip huffman coding */
|
|
size_t HUF_compress1X_repeat(void* dst, size_t dstSize,
|
|
const void* src, size_t srcSize,
|
|
unsigned maxSymbolValue, unsigned tableLog,
|
|
void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */
|
|
HUF_CElt* hufTable, HUF_repeat* repeat, int flags);
|
|
|
|
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, int flags);
|
|
#ifndef HUF_FORCE_DECOMPRESS_X1
|
|
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, int flags); /**< double-symbols decoder */
|
|
#endif
|
|
|
|
/* BMI2 variants.
|
|
* If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0.
|
|
*/
|
|
size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int flags);
|
|
#ifndef HUF_FORCE_DECOMPRESS_X2
|
|
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, int flags);
|
|
#endif
|
|
size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int flags);
|
|
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, int flags);
|
|
#ifndef HUF_FORCE_DECOMPRESS_X2
|
|
size_t HUF_readDTableX1_wksp(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize, int flags);
|
|
#endif
|
|
#ifndef HUF_FORCE_DECOMPRESS_X1
|
|
size_t HUF_readDTableX2_wksp(HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize, int flags);
|
|
#endif
|
|
|
|
#endif /* HUF_H_298734234 */
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|