FSE_PUBLIC_API unsigned FSE_versionNumber(void); /**< library version number; to be used when checking dll version */
-/*-****************************************
-* FSE simple functions
-******************************************/
-/*! FSE_compress() :
- Compress content of buffer 'src', of size 'srcSize', into destination buffer 'dst'.
- 'dst' buffer must be already allocated. Compression runs faster is dstCapacity >= FSE_compressBound(srcSize).
- @return : size of compressed data (<= dstCapacity).
- Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!!
- if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression instead.
- if FSE_isError(return), compression failed (more details using FSE_getErrorName())
-*/
-FSE_PUBLIC_API size_t FSE_compress(void* dst, size_t dstCapacity,
- const void* src, size_t srcSize);
-
-/*! FSE_decompress():
- Decompress FSE data from buffer 'cSrc', of size 'cSrcSize',
- into already allocated destination buffer 'dst', of size 'dstCapacity'.
- @return : size of regenerated data (<= maxDstSize),
- or an error code, which can be tested using FSE_isError() .
-
- ** Important ** : FSE_decompress() does not decompress non-compressible nor RLE data !!!
- Why ? : making this distinction requires a header.
- Header management is intentionally delegated to the user layer, which can better manage special cases.
-*/
-FSE_PUBLIC_API size_t FSE_decompress(void* dst, size_t dstCapacity,
- const void* cSrc, size_t cSrcSize);
-
-
/*-*****************************************
* Tool functions
******************************************/
FSE_PUBLIC_API const char* FSE_getErrorName(size_t code); /* provides error code string (useful for debugging) */
-/*-*****************************************
-* FSE advanced functions
-******************************************/
-/*! FSE_compress2() :
- Same as FSE_compress(), but allows the selection of 'maxSymbolValue' and 'tableLog'
- Both parameters can be defined as '0' to mean : use default value
- @return : size of compressed data
- Special values : if return == 0, srcData is not compressible => Nothing is stored within cSrc !!!
- if return == 1, srcData is a single byte symbol * srcSize times. Use RLE compression.
- if FSE_isError(return), it's an error code.
-*/
-FSE_PUBLIC_API size_t FSE_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
-
-
/*-*****************************************
* FSE detailed API
******************************************/
/*! Constructor and Destructor of FSE_CTable.
Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */
typedef unsigned FSE_CTable; /* don't allocate that. It's only meant to be more restrictive than void* */
-FSE_PUBLIC_API FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog);
-FSE_PUBLIC_API void FSE_freeCTable (FSE_CTable* ct);
/*! FSE_buildCTable():
Builds `ct`, which must be already allocated, using FSE_createCTable().
unsigned* maxSymbolValuePtr, unsigned* tableLogPtr,
const void* rBuffer, size_t rBuffSize, int bmi2);
-/*! Constructor and Destructor of FSE_DTable.
- Note that its size depends on 'tableLog' */
typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */
-FSE_PUBLIC_API FSE_DTable* FSE_createDTable(unsigned tableLog);
-FSE_PUBLIC_API void FSE_freeDTable(FSE_DTable* dt);
-
-/*! FSE_buildDTable():
- Builds 'dt', which must be already allocated, using FSE_createDTable().
- return : 0, or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_buildDTable (FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog);
-
-/*! FSE_decompress_usingDTable():
- Decompress compressed source `cSrc` of size `cSrcSize` using `dt`
- into `dst` which must be already allocated.
- @return : size of regenerated data (necessarily <= `dstCapacity`),
- or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_decompress_usingDTable(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, const FSE_DTable* dt);
/*!
Tutorial :
unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus);
/**< same as FSE_optimalTableLog(), which used `minus==2` */
-/* FSE_compress_wksp() :
- * Same as FSE_compress2(), but using an externally allocated scratch buffer (`workSpace`).
- * FSE_COMPRESS_WKSP_SIZE_U32() provides the minimum size required for `workSpace` as a table of FSE_CTable.
- */
-#define FSE_COMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) ( FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) + ((maxTableLog > 12) ? (1 << (maxTableLog - 2)) : 1024) )
-size_t FSE_compress_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize);
-
-size_t FSE_buildCTable_raw (FSE_CTable* ct, unsigned nbBits);
-/**< build a fake FSE_CTable, designed for a flat distribution, where each symbol uses nbBits */
-
size_t FSE_buildCTable_rle (FSE_CTable* ct, unsigned char symbolValue);
/**< build a fake FSE_CTable, designed to compress always the same symbolValue */
FSE_PUBLIC_API size_t FSE_buildDTable_wksp(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize);
/**< Same as FSE_buildDTable(), using an externally allocated `workspace` produced with `FSE_BUILD_DTABLE_WKSP_SIZE_U32(maxSymbolValue)` */
-size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits);
-/**< build a fake FSE_DTable, designed to read a flat distribution where each symbol uses nbBits */
-
-size_t FSE_buildDTable_rle (FSE_DTable* dt, unsigned char symbolValue);
-/**< build a fake FSE_DTable, designed to always generate the same symbolValue */
-
#define FSE_DECOMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) (FSE_DTABLE_SIZE_U32(maxTableLog) + 1 + FSE_BUILD_DTABLE_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) + (FSE_MAX_SYMBOL_VALUE + 1) / 2 + 1)
#define FSE_DECOMPRESS_WKSP_SIZE(maxTableLog, maxSymbolValue) (FSE_DECOMPRESS_WKSP_SIZE_U32(maxTableLog, maxSymbolValue) * sizeof(unsigned))
-size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize);
-/**< same as FSE_decompress(), using an externally allocated `workSpace` produced with `FSE_DECOMPRESS_WKSP_SIZE_U32(maxLog, maxSymbolValue)` */
-
size_t FSE_decompress_wksp_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize, int bmi2);
-/**< Same as FSE_decompress_wksp() but with dynamic BMI2 support. Pass 1 if your CPU supports BMI2 or 0 if it doesn't. */
+/**< same as FSE_decompress(), using an externally allocated `workSpace` produced with `FSE_DECOMPRESS_WKSP_SIZE_U32(maxLog, maxSymbolValue)`.
+ * Set bmi2 to 1 if your CPU supports BMI2 or 0 if it doesn't */
typedef enum {
FSE_repeat_none, /**< Cannot use the previous table */
#define FSE_FUNCTION_NAME(X,Y) FSE_CAT(X,Y)
#define FSE_TYPE_NAME(X,Y) FSE_CAT(X,Y)
-
-/* Function templates */
-FSE_DTable* FSE_createDTable (unsigned tableLog)
-{
- if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX;
- return (FSE_DTable*)ZSTD_malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) );
-}
-
-void FSE_freeDTable (FSE_DTable* dt)
-{
- ZSTD_free(dt);
-}
-
static size_t FSE_buildDTable_internal(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize)
{
void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */
/*-*******************************************************
* Decompression (Byte symbols)
*********************************************************/
-size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
-{
- void* ptr = dt;
- FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
- void* dPtr = dt + 1;
- FSE_decode_t* const cell = (FSE_decode_t*)dPtr;
-
- DTableH->tableLog = 0;
- DTableH->fastMode = 0;
-
- cell->newState = 0;
- cell->symbol = symbolValue;
- cell->nbBits = 0;
-
- return 0;
-}
-
-
-size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
-{
- void* ptr = dt;
- FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
- void* dPtr = dt + 1;
- FSE_decode_t* const dinfo = (FSE_decode_t*)dPtr;
- const unsigned tableSize = 1 << nbBits;
- const unsigned tableMask = tableSize - 1;
- const unsigned maxSV1 = tableMask+1;
- unsigned s;
-
- /* Sanity checks */
- if (nbBits < 1) return ERROR(GENERIC); /* min size */
-
- /* Build Decoding Table */
- DTableH->tableLog = (U16)nbBits;
- DTableH->fastMode = 1;
- for (s=0; s<maxSV1; s++) {
- dinfo[s].newState = 0;
- dinfo[s].symbol = (BYTE)s;
- dinfo[s].nbBits = (BYTE)nbBits;
- }
-
- return 0;
-}
FORCE_INLINE_TEMPLATE size_t FSE_decompress_usingDTable_generic(
void* dst, size_t maxDstSize,
return op-ostart;
}
-
-size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
- const void* cSrc, size_t cSrcSize,
- const FSE_DTable* dt)
-{
- const void* ptr = dt;
- const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr;
- const U32 fastMode = DTableH->fastMode;
-
- /* select fast mode (static) */
- if (fastMode) return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1);
- return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0);
-}
-
-
-size_t FSE_decompress_wksp(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
-{
- return FSE_decompress_wksp_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, /* bmi2 */ 0);
-}
-
typedef struct {
short ncount[FSE_MAX_SYMBOL_VALUE + 1];
FSE_DTable dtable[1]; /* Dynamically sized */
return FSE_decompress_wksp_body_default(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize);
}
-
-typedef FSE_DTable DTable_max_t[FSE_DTABLE_SIZE_U32(FSE_MAX_TABLELOG)];
-
-#ifndef ZSTD_NO_UNUSED_FUNCTIONS
-size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog) {
- U32 wksp[FSE_BUILD_DTABLE_WKSP_SIZE_U32(FSE_TABLELOG_ABSOLUTE_MAX, FSE_MAX_SYMBOL_VALUE)];
- return FSE_buildDTable_wksp(dt, normalizedCounter, maxSymbolValue, tableLog, wksp, sizeof(wksp));
-}
-
-size_t FSE_decompress(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize)
-{
- /* Static analyzer seems unable to understand this table will be properly initialized later */
- U32 wksp[FSE_DECOMPRESS_WKSP_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)];
- return FSE_decompress_wksp(dst, dstCapacity, cSrc, cSrcSize, FSE_MAX_TABLELOG, wksp, sizeof(wksp));
-}
-#endif
-
-
#endif /* FSE_COMMONDEFS_ONLY */
* FSE Compression Code
****************************************************************/
-FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog)
-{
- size_t size;
- if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX;
- size = FSE_CTABLE_SIZE_U32 (tableLog, maxSymbolValue) * sizeof(U32);
- return (FSE_CTable*)ZSTD_malloc(size);
-}
-
-void FSE_freeCTable (FSE_CTable* ct) { ZSTD_free(ct); }
-
/* provides the minimum logSize to safely represent a distribution */
static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue)
{
return tableLog;
}
-
-/* fake FSE_CTable, for raw (uncompressed) input */
-size_t FSE_buildCTable_raw (FSE_CTable* ct, unsigned nbBits)
-{
- const unsigned tableSize = 1 << nbBits;
- const unsigned tableMask = tableSize - 1;
- const unsigned maxSymbolValue = tableMask;
- void* const ptr = ct;
- U16* const tableU16 = ( (U16*) ptr) + 2;
- void* const FSCT = ((U32*)ptr) + 1 /* header */ + (tableSize>>1); /* assumption : tableLog >= 1 */
- FSE_symbolCompressionTransform* const symbolTT = (FSE_symbolCompressionTransform*) (FSCT);
- unsigned s;
-
- /* Sanity checks */
- if (nbBits < 1) return ERROR(GENERIC); /* min size */
-
- /* header */
- tableU16[-2] = (U16) nbBits;
- tableU16[-1] = (U16) maxSymbolValue;
-
- /* Build table */
- for (s=0; s<tableSize; s++)
- tableU16[s] = (U16)(tableSize + s);
-
- /* Build Symbol Transformation Table */
- { const U32 deltaNbBits = (nbBits << 16) - (1 << nbBits);
- for (s=0; s<=maxSymbolValue; s++) {
- symbolTT[s].deltaNbBits = deltaNbBits;
- symbolTT[s].deltaFindState = s-1;
- } }
-
- return 0;
-}
-
/* fake FSE_CTable, for rle input (always same symbol) */
size_t FSE_buildCTable_rle (FSE_CTable* ct, BYTE symbolValue)
{
size_t FSE_compressBound(size_t size) { return FSE_COMPRESSBOUND(size); }
-#ifndef ZSTD_NO_UNUSED_FUNCTIONS
-/* FSE_compress_wksp() :
- * Same as FSE_compress2(), but using an externally allocated scratch buffer (`workSpace`).
- * `wkspSize` size must be `(1<<tableLog)`.
- */
-size_t FSE_compress_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize)
-{
- BYTE* const ostart = (BYTE*) dst;
- BYTE* op = ostart;
- BYTE* const oend = ostart + dstSize;
-
- unsigned count[FSE_MAX_SYMBOL_VALUE+1];
- S16 norm[FSE_MAX_SYMBOL_VALUE+1];
- FSE_CTable* CTable = (FSE_CTable*)workSpace;
- size_t const CTableSize = FSE_CTABLE_SIZE_U32(tableLog, maxSymbolValue);
- void* scratchBuffer = (void*)(CTable + CTableSize);
- size_t const scratchBufferSize = wkspSize - (CTableSize * sizeof(FSE_CTable));
-
- /* init conditions */
- if (wkspSize < FSE_COMPRESS_WKSP_SIZE_U32(tableLog, maxSymbolValue)) return ERROR(tableLog_tooLarge);
- if (srcSize <= 1) return 0; /* Not compressible */
- if (!maxSymbolValue) maxSymbolValue = FSE_MAX_SYMBOL_VALUE;
- if (!tableLog) tableLog = FSE_DEFAULT_TABLELOG;
-
- /* Scan input and build symbol stats */
- { CHECK_V_F(maxCount, HIST_count_wksp(count, &maxSymbolValue, src, srcSize, scratchBuffer, scratchBufferSize) );
- if (maxCount == srcSize) return 1; /* only a single symbol in src : rle */
- if (maxCount == 1) return 0; /* each symbol present maximum once => not compressible */
- if (maxCount < (srcSize >> 7)) return 0; /* Heuristic : not compressible enough */
- }
-
- tableLog = FSE_optimalTableLog(tableLog, srcSize, maxSymbolValue);
- CHECK_F( FSE_normalizeCount(norm, tableLog, count, srcSize, maxSymbolValue, /* useLowProbCount */ srcSize >= 2048) );
-
- /* Write table description header */
- { CHECK_V_F(nc_err, FSE_writeNCount(op, oend-op, norm, maxSymbolValue, tableLog) );
- op += nc_err;
- }
-
- /* Compress */
- CHECK_F( FSE_buildCTable_wksp(CTable, norm, maxSymbolValue, tableLog, scratchBuffer, scratchBufferSize) );
- { CHECK_V_F(cSize, FSE_compress_usingCTable(op, oend - op, src, srcSize, CTable) );
- if (cSize == 0) return 0; /* not enough space for compressed data */
- op += cSize;
- }
-
- /* check compressibility */
- if ( (size_t)(op-ostart) >= srcSize-1 ) return 0;
-
- return op-ostart;
-}
-
-typedef struct {
- FSE_CTable CTable_max[FSE_CTABLE_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)];
- union {
- U32 hist_wksp[HIST_WKSP_SIZE_U32];
- BYTE scratchBuffer[1 << FSE_MAX_TABLELOG];
- } workspace;
-} fseWkspMax_t;
-
-size_t FSE_compress2 (void* dst, size_t dstCapacity, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog)
-{
- fseWkspMax_t scratchBuffer;
- DEBUG_STATIC_ASSERT(sizeof(scratchBuffer) >= FSE_COMPRESS_WKSP_SIZE_U32(FSE_MAX_TABLELOG, FSE_MAX_SYMBOL_VALUE)); /* compilation failures here means scratchBuffer is not large enough */
- if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge);
- return FSE_compress_wksp(dst, dstCapacity, src, srcSize, maxSymbolValue, tableLog, &scratchBuffer, sizeof(scratchBuffer));
-}
-
-size_t FSE_compress (void* dst, size_t dstCapacity, const void* src, size_t srcSize)
-{
- return FSE_compress2(dst, dstCapacity, src, srcSize, FSE_MAX_SYMBOL_VALUE, FSE_DEFAULT_TABLELOG);
-}
-#endif
-
#endif /* FSE_COMMONDEFS_ONLY */
projects / thirdparty / zstd.git / commitdiff
