ddidderr/zstd-rs
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support default LL distribution

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This commit is contained in:
Yann Collet
2016-03-21 00:39:19 +01:00
parent d64f435f63
commit 6c62b7dfc8
4 changed files with 65 additions and 61 deletions
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lib/zstd_compress.c
+8 -2
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@@ -655,7 +655,7 @@ static const BYTE deltaCode = 18;
/* CTable for Literal Lengths */
#if 1
{ U32 max = 36;
{ U32 max = 35;
size_t const mostFrequent = FSE_countFast(count, &max, llCodeTable, nbSeq);
if ((mostFrequent == nbSeq) && (nbSeq > 2)) {
*op++ = llCodeTable[0];
@@ -664,7 +664,13 @@ static const BYTE deltaCode = 18;
} else if ((zc->flagStaticTables) && (nbSeq < MAX_SEQ_FOR_STATIC_FSE)) {
LLtype = FSE_ENCODING_STATIC;
} else if ((nbSeq < MIN_SEQ_FOR_DYNAMIC_FSE) || (mostFrequent < (nbSeq >> (LLbits-1)))) {
FSE_buildCTable_raw(CTable_LitLength, LLbits);
static const S16 LL_defaultNorm[36] = { 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 1, 1, 1, 1,
1, 1, 1, 1 };
static const U32 LL_defaultNormLog = 6;
FSE_buildCTable(CTable_LitLength, LL_defaultNorm, 35, LL_defaultNormLog);
LLtype = FSE_ENCODING_RAW;
} else {
size_t NCountSize;