391 lines
14 KiB
C
391 lines
14 KiB
C
|
/* ******************************************************************
|
||
|
|
* FSE : Finite State Entropy decoder
|
||
|
|
* Copyright (c) Yann Collet, Facebook, Inc.
|
||
|
|
*
|
||
|
|
* You can contact the author at :
|
||
|
|
* - FSE source repository : https://github.com/Cyan4973/FiniteStateEntropy
|
||
|
|
* - Public forum : https://groups.google.com/forum/#!forum/lz4c
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
****************************************************************** */
|
||
|
|
|
||
|
|
|
||
|
|
/* **************************************************************
|
||
|
|
* Includes
|
||
|
|
****************************************************************/
|
||
|
|
#include "debug.h" /* assert */
|
||
|
|
#include "bitstream.h"
|
||
|
|
#include "compiler.h"
|
||
|
|
#define FSE_STATIC_LINKING_ONLY
|
||
|
|
#include "fse.h"
|
||
|
|
#include "error_private.h"
|
||
|
|
#define ZSTD_DEPS_NEED_MALLOC
|
||
|
|
#include "zstd_deps.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* **************************************************************
|
||
|
|
* Error Management
|
||
|
|
****************************************************************/
|
||
|
|
#define FSE_isError ERR_isError
|
||
|
|
#define FSE_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c) /* use only *after* variable declarations */
|
||
|
|
|
||
|
|
|
||
|
|
/* **************************************************************
|
||
|
|
* Templates
|
||
|
|
****************************************************************/
|
||
|
|
/*
|
||
|
|
designed to be included
|
||
|
|
for type-specific functions (template emulation in C)
|
||
|
|
Objective is to write these functions only once, for improved maintenance
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* safety checks */
|
||
|
|
#ifndef FSE_FUNCTION_EXTENSION
|
||
|
|
# error "FSE_FUNCTION_EXTENSION must be defined"
|
||
|
|
#endif
|
||
|
|
#ifndef FSE_FUNCTION_TYPE
|
||
|
|
# error "FSE_FUNCTION_TYPE must be defined"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Function names */
|
||
|
|
#define FSE_CAT(X,Y) X##Y
|
||
|
|
#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 */
|
||
|
|
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (tdPtr);
|
||
|
|
U16* symbolNext = (U16*)workSpace;
|
||
|
|
BYTE* spread = (BYTE*)(symbolNext + maxSymbolValue + 1);
|
||
|
|
|
||
|
|
U32 const maxSV1 = maxSymbolValue + 1;
|
||
|
|
U32 const tableSize = 1 << tableLog;
|
||
|
|
U32 highThreshold = tableSize-1;
|
||
|
|
|
||
|
|
/* Sanity Checks */
|
||
|
|
if (FSE_BUILD_DTABLE_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(maxSymbolValue_tooLarge);
|
||
|
|
if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge);
|
||
|
|
if (tableLog > FSE_MAX_TABLELOG) return ERROR(tableLog_tooLarge);
|
||
|
|
|
||
|
|
/* Init, lay down lowprob symbols */
|
||
|
|
{ FSE_DTableHeader DTableH;
|
||
|
|
DTableH.tableLog = (U16)tableLog;
|
||
|
|
DTableH.fastMode = 1;
|
||
|
|
{ S16 const largeLimit= (S16)(1 << (tableLog-1));
|
||
|
|
U32 s;
|
||
|
|
for (s=0; s<maxSV1; s++) {
|
||
|
|
if (normalizedCounter[s]==-1) {
|
||
|
|
tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s;
|
||
|
|
symbolNext[s] = 1;
|
||
|
|
} else {
|
||
|
|
if (normalizedCounter[s] >= largeLimit) DTableH.fastMode=0;
|
||
|
|
symbolNext[s] = normalizedCounter[s];
|
||
|
|
} } }
|
||
|
|
ZSTD_memcpy(dt, &DTableH, sizeof(DTableH));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Spread symbols */
|
||
|
|
if (highThreshold == tableSize - 1) {
|
||
|
|
size_t const tableMask = tableSize-1;
|
||
|
|
size_t const step = FSE_TABLESTEP(tableSize);
|
||
|
|
/* First lay down the symbols in order.
|
||
|
|
* We use a uint64_t to lay down 8 bytes at a time. This reduces branch
|
||
|
|
* misses since small blocks generally have small table logs, so nearly
|
||
|
|
* all symbols have counts <= 8. We ensure we have 8 bytes at the end of
|
||
|
|
* our buffer to handle the over-write.
|
||
|
|
*/
|
||
|
|
{
|
||
|
|
U64 const add = 0x0101010101010101ull;
|
||
|
|
size_t pos = 0;
|
||
|
|
U64 sv = 0;
|
||
|
|
U32 s;
|
||
|
|
for (s=0; s<maxSV1; ++s, sv += add) {
|
||
|
|
int i;
|
||
|
|
int const n = normalizedCounter[s];
|
||
|
|
MEM_write64(spread + pos, sv);
|
||
|
|
for (i = 8; i < n; i += 8) {
|
||
|
|
MEM_write64(spread + pos + i, sv);
|
||
|
|
}
|
||
|
|
pos += n;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* Now we spread those positions across the table.
|
||
|
|
* The benefit of doing it in two stages is that we avoid the 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.
|
||
|
|
*/
|
||
|
|
{
|
||
|
|
size_t position = 0;
|
||
|
|
size_t s;
|
||
|
|
size_t const unroll = 2;
|
||
|
|
assert(tableSize % unroll == 0); /* FSE_MIN_TABLELOG is 5 */
|
||
|
|
for (s = 0; s < (size_t)tableSize; s += unroll) {
|
||
|
|
size_t u;
|
||
|
|
for (u = 0; u < unroll; ++u) {
|
||
|
|
size_t const uPosition = (position + (u * step)) & tableMask;
|
||
|
|
tableDecode[uPosition].symbol = spread[s + u];
|
||
|
|
}
|
||
|
|
position = (position + (unroll * step)) & tableMask;
|
||
|
|
}
|
||
|
|
assert(position == 0);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
U32 const tableMask = tableSize-1;
|
||
|
|
U32 const step = FSE_TABLESTEP(tableSize);
|
||
|
|
U32 s, position = 0;
|
||
|
|
for (s=0; s<maxSV1; s++) {
|
||
|
|
int i;
|
||
|
|
for (i=0; i<normalizedCounter[s]; i++) {
|
||
|
|
tableDecode[position].symbol = (FSE_FUNCTION_TYPE)s;
|
||
|
|
position = (position + step) & tableMask;
|
||
|
|
while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */
|
||
|
|
} }
|
||
|
|
if (position!=0) return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Build Decoding table */
|
||
|
|
{ U32 u;
|
||
|
|
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].newState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize);
|
||
|
|
} }
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t FSE_buildDTable_wksp(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize)
|
||
|
|
{
|
||
|
|
return FSE_buildDTable_internal(dt, normalizedCounter, maxSymbolValue, tableLog, workSpace, wkspSize);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef FSE_COMMONDEFS_ONLY
|
||
|
|
|
||
|
|
/*-*******************************************************
|
||
|
|
* 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,
|
||
|
|
const void* cSrc, size_t cSrcSize,
|
||
|
|
const FSE_DTable* dt, const unsigned fast)
|
||
|
|
{
|
||
|
|
BYTE* const ostart = (BYTE*) dst;
|
||
|
|
BYTE* op = ostart;
|
||
|
|
BYTE* const omax = op + maxDstSize;
|
||
|
|
BYTE* const olimit = omax-3;
|
||
|
|
|
||
|
|
BIT_DStream_t bitD;
|
||
|
|
FSE_DState_t state1;
|
||
|
|
FSE_DState_t state2;
|
||
|
|
|
||
|
|
/* Init */
|
||
|
|
CHECK_F(BIT_initDStream(&bitD, cSrc, cSrcSize));
|
||
|
|
|
||
|
|
FSE_initDState(&state1, &bitD, dt);
|
||
|
|
FSE_initDState(&state2, &bitD, dt);
|
||
|
|
|
||
|
|
#define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD)
|
||
|
|
|
||
|
|
/* 4 symbols per loop */
|
||
|
|
for ( ; (BIT_reloadDStream(&bitD)==BIT_DStream_unfinished) & (op<olimit) ; op+=4) {
|
||
|
|
op[0] = FSE_GETSYMBOL(&state1);
|
||
|
|
|
||
|
|
if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
||
|
|
BIT_reloadDStream(&bitD);
|
||
|
|
|
||
|
|
op[1] = FSE_GETSYMBOL(&state2);
|
||
|
|
|
||
|
|
if (FSE_MAX_TABLELOG*4+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
||
|
|
{ if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) { op+=2; break; } }
|
||
|
|
|
||
|
|
op[2] = FSE_GETSYMBOL(&state1);
|
||
|
|
|
||
|
|
if (FSE_MAX_TABLELOG*2+7 > sizeof(bitD.bitContainer)*8) /* This test must be static */
|
||
|
|
BIT_reloadDStream(&bitD);
|
||
|
|
|
||
|
|
op[3] = FSE_GETSYMBOL(&state2);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* tail */
|
||
|
|
/* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */
|
||
|
|
while (1) {
|
||
|
|
if (op>(omax-2)) return ERROR(dstSize_tooSmall);
|
||
|
|
*op++ = FSE_GETSYMBOL(&state1);
|
||
|
|
if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) {
|
||
|
|
*op++ = FSE_GETSYMBOL(&state2);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (op>(omax-2)) return ERROR(dstSize_tooSmall);
|
||
|
|
*op++ = FSE_GETSYMBOL(&state2);
|
||
|
|
if (BIT_reloadDStream(&bitD)==BIT_DStream_overflow) {
|
||
|
|
*op++ = FSE_GETSYMBOL(&state1);
|
||
|
|
break;
|
||
|
|
} }
|
||
|
|
|
||
|
|
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 */
|
||
|
|
} FSE_DecompressWksp;
|
||
|
|
|
||
|
|
|
||
|
|
FORCE_INLINE_TEMPLATE size_t FSE_decompress_wksp_body(
|
||
|
|
void* dst, size_t dstCapacity,
|
||
|
|
const void* cSrc, size_t cSrcSize,
|
||
|
|
unsigned maxLog, void* workSpace, size_t wkspSize,
|
||
|
|
int bmi2)
|
||
|
|
{
|
||
|
|
const BYTE* const istart = (const BYTE*)cSrc;
|
||
|
|
const BYTE* ip = istart;
|
||
|
|
unsigned tableLog;
|
||
|
|
unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE;
|
||
|
|
FSE_DecompressWksp* const wksp = (FSE_DecompressWksp*)workSpace;
|
||
|
|
|
||
|
|
DEBUG_STATIC_ASSERT((FSE_MAX_SYMBOL_VALUE + 1) % 2 == 0);
|
||
|
|
if (wkspSize < sizeof(*wksp)) return ERROR(GENERIC);
|
||
|
|
|
||
|
|
/* normal FSE decoding mode */
|
||
|
|
{
|
||
|
|
size_t const NCountLength = FSE_readNCount_bmi2(wksp->ncount, &maxSymbolValue, &tableLog, istart, cSrcSize, bmi2);
|
||
|
|
if (FSE_isError(NCountLength)) return NCountLength;
|
||
|
|
if (tableLog > maxLog) return ERROR(tableLog_tooLarge);
|
||
|
|
assert(NCountLength <= cSrcSize);
|
||
|
|
ip += NCountLength;
|
||
|
|
cSrcSize -= NCountLength;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (FSE_DECOMPRESS_WKSP_SIZE(tableLog, maxSymbolValue) > wkspSize) return ERROR(tableLog_tooLarge);
|
||
|
|
workSpace = wksp->dtable + FSE_DTABLE_SIZE_U32(tableLog);
|
||
|
|
wkspSize -= sizeof(*wksp) + FSE_DTABLE_SIZE(tableLog);
|
||
|
|
|
||
|
|
CHECK_F( FSE_buildDTable_internal(wksp->dtable, wksp->ncount, maxSymbolValue, tableLog, workSpace, wkspSize) );
|
||
|
|
|
||
|
|
{
|
||
|
|
const void* ptr = wksp->dtable;
|
||
|
|
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, dstCapacity, ip, cSrcSize, wksp->dtable, 1);
|
||
|
|
return FSE_decompress_usingDTable_generic(dst, dstCapacity, ip, cSrcSize, wksp->dtable, 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Avoids the FORCE_INLINE of the _body() function. */
|
||
|
|
static size_t FSE_decompress_wksp_body_default(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, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if DYNAMIC_BMI2
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
#if DYNAMIC_BMI2
|
||
|
|
if (bmi2) {
|
||
|
|
return FSE_decompress_wksp_body_bmi2(dst, dstCapacity, cSrc, cSrcSize, maxLog, workSpace, wkspSize);
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
(void)bmi2;
|
||
|
|
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)];
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* FSE_COMMONDEFS_ONLY */
|