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updated fse (minor refactor)

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This commit is contained in:
Yann Collet 2016-05-06 16:55:27 +02:00
parent 18dedece91
commit a5dacdf551
2 changed files with 57 additions and 58 deletions
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69
lib/decompress/fse_decompress.c
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@ -111,17 +111,13 @@ void FSE_freeDTable (FSE_DTable* dt)
size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
{
FSE_DTableHeader DTableH;
void* const tdPtr = dt+1; /* because dt is unsigned, 32-bits aligned on 32-bits */
void* const tdPtr = dt+1; /* because *dt is unsigned, 32-bits aligned on 32-bits */
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (tdPtr);
const U32 tableSize = 1 << tableLog;
const U32 tableMask = tableSize-1;
const U32 step = FSE_TABLESTEP(tableSize);
U16 symbolNext[FSE_MAX_SYMBOL_VALUE+1];
U32 const maxSV1 = maxSymbolValue + 1;
U32 const tableSize = 1 << tableLog;
U32 highThreshold = tableSize-1;
S16 const largeLimit= (S16)(1 << (tableLog-1));
U32 noLarge = 1;
U32 s;
/* Sanity Checks */
if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE) return ERROR(maxSymbolValue_tooLarge);
@ -129,18 +125,24 @@ size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned
/* Init, lay down lowprob symbols */
DTableH.tableLog = (U16)tableLog;
for (s=0; s<=maxSymbolValue; s++) {
if (normalizedCounter[s]==-1) {
tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s;
symbolNext[s] = 1;
} else {
if (normalizedCounter[s] >= largeLimit) noLarge=0;
symbolNext[s] = normalizedCounter[s];
} }
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];
} } }
memcpy(dt, &DTableH, sizeof(DTableH));
/* Spread symbols */
{ U32 position = 0;
for (s=0; s<=maxSymbolValue; s++) {
{ 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;
@ -154,15 +156,12 @@ size_t FSE_buildDTable(FSE_DTable* dt, const short* normalizedCounter, unsigned
/* Build Decoding table */
{ U32 u;
for (u=0; u<tableSize; u++) {
FSE_FUNCTION_TYPE symbol = (FSE_FUNCTION_TYPE)(tableDecode[u].symbol);
FSE_FUNCTION_TYPE const symbol = (FSE_FUNCTION_TYPE)(tableDecode[u].symbol);
U16 nextState = symbolNext[symbol]++;
tableDecode[u].nbBits = (BYTE) (tableLog - BIT_highbit32 ((U32)nextState) );
tableDecode[u].newState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize);
} }
DTableH.fastMode = (U16)noLarge;
memcpy(dt, &DTableH, sizeof(DTableH));
return 0;
}
@ -199,7 +198,7 @@ size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
FSE_decode_t* const dinfo = (FSE_decode_t*)dPtr;
const unsigned tableSize = 1 << nbBits;
const unsigned tableMask = tableSize - 1;
const unsigned maxSymbolValue = tableMask;
const unsigned maxSV1 = tableMask+1;
unsigned s;
/* Sanity checks */
@ -208,7 +207,7 @@ size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
/* Build Decoding Table */
DTableH->tableLog = (U16)nbBits;
DTableH->fastMode = 1;
for (s=0; s<=maxSymbolValue; s++) {
for (s=0; s<maxSV1; s++) {
dinfo[s].newState = 0;
dinfo[s].symbol = (BYTE)s;
dinfo[s].nbBits = (BYTE)nbBits;
@ -230,11 +229,10 @@ FORCE_INLINE size_t FSE_decompress_usingDTable_generic(
BIT_DStream_t bitD;
FSE_DState_t state1;
FSE_DState_t state2;
size_t errorCode;
/* Init */
errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */
if (FSE_isError(errorCode)) return errorCode;
{ size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize); /* replaced last arg by maxCompressed Size */
if (FSE_isError(errorCode)) return errorCode; }
FSE_initDState(&state1, &bitD, dt);
FSE_initDState(&state2, &bitD, dt);
@ -308,22 +306,21 @@ size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, size_t cSr
DTable_max_t dt; /* Static analyzer seems unable to understand this table will be properly initialized later */
unsigned tableLog;
unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE;
size_t errorCode;
if (cSrcSize<2) return ERROR(srcSize_wrong); /* too small input size */
/* normal FSE decoding mode */
errorCode = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize);
if (FSE_isError(errorCode)) return errorCode;
if (errorCode >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */
ip += errorCode;
cSrcSize -= errorCode;
{ size_t const NCountLength = FSE_readNCount (counting, &maxSymbolValue, &tableLog, istart, cSrcSize);
if (FSE_isError(NCountLength)) return NCountLength;
if (NCountLength >= cSrcSize) return ERROR(srcSize_wrong); /* too small input size */
ip += NCountLength;
cSrcSize -= NCountLength;
}
errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog);
if (FSE_isError(errorCode)) return errorCode;
{ size_t const errorCode = FSE_buildDTable (dt, counting, maxSymbolValue, tableLog);
if (FSE_isError(errorCode)) return errorCode; }
/* always return, even if it is an error code */
return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt);
return FSE_decompress_usingDTable (dst, maxDstSize, ip, cSrcSize, dt); /* always return, even if it is an error code */
}

46
lib/decompress/huf_decompress.c
View File

@ -114,7 +114,7 @@ size_t HUF_readDTableX2 (U16* DTable, const void* src, size_t srcSize)
/* Prepare ranks */
nextRankStart = 0;
for (n=1; n<=tableLog; n++) {
for (n=1; n<tableLog+1; n++) {
U32 current = nextRankStart;
nextRankStart += (rankVal[n] << (n-1));
rankVal[n] = current;
@ -442,7 +442,7 @@ size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
/* Get start index of each weight */
{ U32 w, nextRankStart = 0;
for (w=1; w<=maxW; w++) {
for (w=1; w<maxW+1; w++) {
U32 current = nextRankStart;
nextRankStart += rankStats[w];
rankStart[w] = current;
@ -454,8 +454,8 @@ size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
/* sort symbols by weight */
{ U32 s;
for (s=0; s<nbSymbols; s++) {
U32 w = weightList[s];
U32 r = rankStart[w]++;
U32 const w = weightList[s];
U32 const r = rankStart[w]++;
sortedSymbol[r].symbol = (BYTE)s;
sortedSymbol[r].weight = (BYTE)w;
}
@ -463,21 +463,23 @@ size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
}
/* Build rankVal */
{ const U32 minBits = tableLog+1 - maxW;
U32 nextRankVal = 0;
U32 w, consumed;
const int rescale = (memLog-tableLog) - 1; /* tableLog <= memLog */
U32* rankVal0 = rankVal[0];
for (w=1; w<=maxW; w++) {
U32 current = nextRankVal;
nextRankVal += rankStats[w] << (w+rescale);
rankVal0[w] = current;
}
for (consumed = minBits; consumed <= memLog - minBits; consumed++) {
U32* rankValPtr = rankVal[consumed];
for (w = 1; w <= maxW; w++) {
rankValPtr[w] = rankVal0[w] >> consumed;
} } }
{ U32* const rankVal0 = rankVal[0];
{ int const rescale = (memLog-tableLog) - 1; /* tableLog <= memLog */
U32 nextRankVal = 0;
U32 w;
for (w=1; w<maxW+1; w++) {
U32 current = nextRankVal;
nextRankVal += rankStats[w] << (w+rescale);
rankVal0[w] = current;
} }
{ U32 const minBits = tableLog+1 - maxW;
U32 consumed;
for (consumed = minBits; consumed < memLog - minBits + 1; consumed++) {
U32* const rankValPtr = rankVal[consumed];
U32 w;
for (w = 1; w < maxW+1; w++) {
rankValPtr[w] = rankVal0[w] >> consumed;
} } } }
HUF_fillDTableX4(dt, memLog,
sortedSymbol, sizeOfSort,
@ -788,7 +790,7 @@ size_t HUF_readDTableX6 (U32* DTable, const void* src, size_t srcSize)
/* Get start index of each weight */
{ U32 w, nextRankStart = 0;
for (w=1; w<=maxW; w++) {
for (w=1; w<maxW+1; w++) {
U32 current = nextRankStart;
nextRankStart += rankStats[w];
rankStart[w] = current;
@ -814,14 +816,14 @@ size_t HUF_readDTableX6 (U32* DTable, const void* src, size_t srcSize)
U32 w, consumed;
const int rescale = (memLog-tableLog) - 1; /* tableLog <= memLog */
U32* rankVal0 = rankVal[0];
for (w=1; w<=maxW; w++) {
for (w=1; w<maxW+1; w++) {
U32 current = nextRankVal;
nextRankVal += rankStats[w] << (w+rescale);
rankVal0[w] = current;
}
for (consumed = minBits; consumed <= memLog - minBits; consumed++) {
U32* rankValPtr = rankVal[consumed];
for (w = 1; w <= maxW; w++) {
for (w = 1; w < maxW+1; w++) {
rankValPtr[w] = rankVal0[w] >> consumed;
} } }