ddidderr/zstd-rs
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support targetlen==0 with strategy==ZSTD_fast

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to mean "normal compression",
targetlen >= 1 now means "disable huffman compression of literals"
This commit is contained in:
Yann Collet
2018-06-07 15:49:01 -07:00
parent a57b4df85f
commit c2c47e24e0
4 changed files with 13 additions and 14 deletions
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lib/compress/zstd_fast.c
+5 -2
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@@ -45,7 +45,7 @@ FORCE_INLINE_TEMPLATE
size_t ZSTD_compressBlock_fast_generic(
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
void const* src, size_t srcSize,
U32 const hlog, U32 const stepSize, U32 const mls,
U32 const hlog, U32 stepSize, U32 const mls,
ZSTD_dictMode_e const dictMode)
{
U32* const hashTable = ms->hashTable;
@@ -84,6 +84,7 @@ size_t ZSTD_compressBlock_fast_generic(
|| prefixStartIndex >= (U32)(dictEnd - dictBase));
/* init */
stepSize += !stepSize; /* support stepSize of 0 */
ip += (dictAndPrefixLength == 0);
if (dictMode == ZSTD_noDict) {
U32 const maxRep = (U32)(ip - prefixStart);
@@ -264,7 +265,7 @@ size_t ZSTD_compressBlock_fast_dictMatchState(
static size_t ZSTD_compressBlock_fast_extDict_generic(
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
void const* src, size_t srcSize,
U32 const hlog, U32 const stepSize, U32 const mls)
U32 const hlog, U32 stepSize, U32 const mls)
{
U32* hashTable = ms->hashTable;
const BYTE* const base = ms->window.base;
@@ -281,6 +282,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(
const BYTE* const ilimit = iend - 8;
U32 offset_1=rep[0], offset_2=rep[1];
stepSize += !stepSize; /* support stepSize == 0 */
/* Search Loop */
while (ip < ilimit) { /* < instead of <=, because (ip+1) */
const size_t h = ZSTD_hashPtr(ip, hlog, mls);