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-rw-r--r--Utilities/cmzstd/lib/common/fse_decompress.c108
1 files changed, 8 insertions, 100 deletions
diff --git a/Utilities/cmzstd/lib/common/fse_decompress.c b/Utilities/cmzstd/lib/common/fse_decompress.c
index f4ff58f..1e1c9f9 100644
--- a/Utilities/cmzstd/lib/common/fse_decompress.c
+++ b/Utilities/cmzstd/lib/common/fse_decompress.c
@@ -1,6 +1,6 @@
/* ******************************************************************
* FSE : Finite State Entropy decoder
- * Copyright (c) Yann Collet, Facebook, Inc.
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
*
* You can contact the author at :
* - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
@@ -24,6 +24,7 @@
#include "error_private.h"
#define ZSTD_DEPS_NEED_MALLOC
#include "zstd_deps.h"
+#include "bits.h" /* ZSTD_highbit32 */
/* **************************************************************
@@ -55,19 +56,6 @@
#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 */
@@ -127,10 +115,10 @@ static size_t FSE_buildDTable_internal(FSE_DTable* dt, const short* normalizedCo
}
}
/* Now we spread those positions across the table.
- * The benefit of doing it in two stages is that we avoid the the
+ * The benefit of doing it in two stages is that we avoid the
* variable size inner loop, which caused lots of branch misses.
* Now we can run through all the positions without any branch misses.
- * We unroll the loop twice, since that is what emperically worked best.
+ * We unroll the loop twice, since that is what empirically worked best.
*/
{
size_t position = 0;
@@ -166,7 +154,7 @@ static size_t FSE_buildDTable_internal(FSE_DTable* dt, const short* normalizedCo
for (u=0; u<tableSize; u++) {
FSE_FUNCTION_TYPE const symbol = (FSE_FUNCTION_TYPE)(tableDecode[u].symbol);
U32 const nextState = symbolNext[symbol]++;
- tableDecode[u].nbBits = (BYTE) (tableLog - BIT_highbit32(nextState) );
+ tableDecode[u].nbBits = (BYTE) (tableLog - ZSTD_highbit32(nextState) );
tableDecode[u].newState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize);
} }
@@ -184,49 +172,6 @@ size_t FSE_buildDTable_wksp(FSE_DTable* dt, const short* normalizedCounter, unsi
/*-*******************************************************
* 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,
@@ -290,26 +235,6 @@ FORCE_INLINE_TEMPLATE size_t FSE_decompress_usingDTable_generic(
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 */
@@ -342,7 +267,8 @@ FORCE_INLINE_TEMPLATE size_t FSE_decompress_wksp_body(
}
if (FSE_DECOMPRESS_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(tableLog_tooLarge);
- workSpace = wksp->dtable + FSE_DTABLE_SIZE_U32(tableLog);
+ assert(sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog) <= wkspSize);
+ workSpace = (BYTE*)workSpace + sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog);
wkspSize -= sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog);
CHECK_F( FSE_buildDTable_internal(wksp->dtable, wksp->ncount, maxSymbolValue, tableLog, workSpace, wkspSize) );
@@ -365,7 +291,7 @@ static size_t FSE_decompress_wksp_body_default(void* dst, size_t dstCapacity, co
}
#if DYNAMIC_BMI2
-TARGET_ATTRIBUTE("bmi2") static size_t FSE_decompress_wksp_body_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
+BMI2_TARGET_ATTRIBUTE static size_t FSE_decompress_wksp_body_bmi2(void* dst, size_t dstCapacity, const void* cSrc, size_t cSrcSize, unsigned maxLog, void* workSpace, size_t wkspSize)
{
return FSE_decompress_wksp_body(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize, 1);
}
@@ -382,22 +308,4 @@ size_t FSE_decompress_wksp_bmi2(void* dst, size_t dstCapacity, const void* cSrc,
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 */
generated by cgit v0.12 at 2025-01-13 05:42:08 (GMT)