ddidderr/zstd-rs
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support for ZSTD_REP_NUM == 1 and ZSTD_REP_NUM == 4

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This commit is contained in:
inikep
2016-03-17 11:21:00 +01:00
parent 5945308983
commit 7d1742825b
4 changed files with 30 additions and 11 deletions
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lib/zstd_decompress.c
+14 -1
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@@ -632,6 +632,9 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
/* Literal length */
litLength = FSE_peakSymbol(&(seqState->stateLL));
#if 0 //ZSTD_REP_NUM == 1
size_t prevOffset = litLength ? seq->offset : seqState->prevOffset[0];
#endif
if (litLength == MaxLL) {
U32 add = *dumps++;
if (add < 255) litLength += add;
@@ -654,6 +657,7 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
if (offsetCode==0) nbBits = 0; /* cmove */
offset = offsetPrefix[offsetCode] + BIT_readBits(&(seqState->DStream), nbBits);
if (MEM_32bits()) BIT_reloadDStream(&(seqState->DStream));
#if ZSTD_REP_NUM == 4
if (offsetCode==0) {
if (!litLength) {
offset = seqState->prevOffset[1];
@@ -675,7 +679,16 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seq->offset; /* cmove */
}
}
}
#else
#if 0
if (offsetCode==0) offset = prevOffset; /* repcode, cmove */
if (offsetCode | !litLength) seqState->prevOffset[0] = seq->offset; /* cmove */
#else
if (offsetCode==0) offset = litLength ? seq->offset : seqState->prevOffset[0]; /* repcode, cmove */
if (offsetCode | !litLength) seqState->prevOffset[0] = seq->offset; /* cmove */
#endif
#endif
FSE_decodeSymbol(&(seqState->stateOffb), &(seqState->DStream)); /* update */
// printf("offsetCode=%d nbBits=%d offset=%d\n", offsetCode, nbBits, (int)offset); fflush(stdout);
}