ddidderr/zstd-rs
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4 repcodes when litLen==0

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This commit is contained in:
inikep
2016-03-17 19:53:38 +01:00
parent 3e743052cd
commit c56e32e782
2 changed files with 33 additions and 44 deletions
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lib/zstd_decompress.c
+25 -25
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@@ -653,15 +653,13 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
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];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
} else
offset = seqState->prevOffset[0];
} else {
if (offset < ZSTD_REP_NUM) { /* offset = 1,2,3 */
if (offsetCode==0) offset = 0;
if (offset < ZSTD_REP_NUM) {
if (!litLength && offset <= 1)
offset = 1-offset;
if (offset != 0)
{
size_t temp = seqState->prevOffset[offset];
if (offset != 1) {
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
@@ -670,23 +668,25 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
offset = temp;
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
} else {
offset -= ZSTD_REP_NUM - 1;
#if 0
seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
#else
if (kSlotNew < 3)
seqState->prevOffset[3] = seqState->prevOffset[2];
if (kSlotNew < 2)
seqState->prevOffset[2] = seqState->prevOffset[1];
if (kSlotNew < 1)
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[kSlotNew] = offset;
#endif
}
else
offset = seqState->prevOffset[0];
} else {
offset -= ZSTD_REP_NUM - 1;
#if 0
seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
#else
if (kSlotNew < 3)
seqState->prevOffset[3] = seqState->prevOffset[2];
if (kSlotNew < 2)
seqState->prevOffset[2] = seqState->prevOffset[1];
if (kSlotNew < 1)
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[kSlotNew] = offset;
#endif
}
#else
if (offsetCode==0) offset = litLength ? seq->offset : seqState->prevOffset[0]; /* repcode, cmove */