krak/zstd
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Code Issues Releases 1 Activity

Literal decompression builds Huffman tables within shared space (for later re-use)

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This commit is contained in:
Yann Collet 2016-06-11 02:35:31 +02:00
parent 237ad4beb3
commit d60a5bf900
1 changed files with 5 additions and 16 deletions
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21
lib/decompress/zstd_decompress.c
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@ -112,7 +112,7 @@ struct ZSTD_DCtx_s
FSE_DTable LLTable[FSE_DTABLE_SIZE_U32(LLFSELog)];
FSE_DTable OffTable[FSE_DTABLE_SIZE_U32(OffFSELog)];
FSE_DTable MLTable[FSE_DTABLE_SIZE_U32(MLFSELog)];
HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog+1)];
HUF_DTable hufTable[HUF_DTABLE_SIZE(HufLog)]; /* can accommodate HUF_decompress4X */
const void* previousDstEnd;
const void* base;
const void* vBase;
@ -143,7 +143,7 @@ size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx)
dctx->base = NULL;
dctx->vBase = NULL;
dctx->dictEnd = NULL;
dctx->hufTable[0] = (HUF_DTable)((HufLog+1)*0x101);
dctx->hufTable[0] = (HUF_DTable)((HufLog)*0x1000001);
dctx->flagRepeatTable = 0;
dctx->dictID = 0;
return 0;
@ -487,8 +487,8 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
if (litCSize + lhSize > srcSize) return ERROR(corruption_detected);
if (HUF_isError(singleStream ?
HUF_decompress1X2(dctx->litBuffer, litSize, istart+lhSize, litCSize) :
HUF_decompress (dctx->litBuffer, litSize, istart+lhSize, litCSize) ))
HUF_decompress1X2_DCtx(dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) :
HUF_decompress4X_DCtx (dctx->hufTable, dctx->litBuffer, litSize, istart+lhSize, litCSize) ))
return ERROR(corruption_detected);
dctx->litPtr = dctx->litBuffer;
@ -677,7 +677,6 @@ typedef struct {
} seqState_t;
static seq_t ZSTD_decodeSequence(seqState_t* seqState)
{
seq_t seq;
@ -869,17 +868,7 @@ static size_t ZSTD_decompressSequences(
for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && nbSeq ; ) {
nbSeq--;
{ seq_t const sequence = ZSTD_decodeSequence(&seqState);
#if 0 /* debug */
static BYTE* start = NULL;
if (start==NULL) start = op;
size_t pos = (size_t)(op-start);
if ((pos >= 5810037) && (pos < 5810400))
printf("Dpos %6u :%5u literals & match %3u bytes at distance %6u \n",
pos, (U32)sequence.litLength, (U32)sequence.matchLength, (U32)sequence.offset);
#endif
{ seq_t const sequence = ZSTD_decodeSequence(&seqState);
size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litLimit_8, base, vBase, dictEnd);
if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
op += oneSeqSize;