ddidderr/zstd-rs
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support for alternate offset (fusion)

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This commit is contained in:
Yann Collet
2016-03-24 02:42:15 +01:00
parent b21ce15efe
commit 646693e3be
3 changed files with 19 additions and 16 deletions
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lib/zstd_decompress.c
+11 -8
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@@ -634,9 +634,12 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
U32 const llBits = LL_bits[llCode];
U32 const mlBits = ML_bits[mlCode];
U32 const ofBits = ofCode ? ofCode-1 : 0;
U32 const ofBits = ofCode;
U32 const totalBits = llBits+mlBits+ofBits;
size_t const allBits = BIT_readBits(&(seqState->DStream), llBits+mlBits+ofBits);
size_t const allBits = BIT_readBits(&(seqState->DStream), totalBits);
if (totalBits > 64 - 7 - (LLFSELog+MLFSELog+OffFSELog)) BIT_reloadDStream(&(seqState->DStream));
static const U32 LL_base[MaxLL+1] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
@@ -650,10 +653,10 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
0x1000, 0x2000, 0x4000, 0x8000, 0x10000 };
static const U32 OF_base[MaxOff+1] = {
1 /*fake*/, 1, 2, 4, 8, 0x10, 0x20, 0x40,
0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000,
0x8000, 0x10000, 0x20000, 0x40000, 0x80000, 0x100000, 0x200000, 0x400000,
0x800000, 0x1000000, 0x2000000, 0x4000000, /*fake*/ 1, 1, 1, 1 };
0, 1, 3, 7, 0xF, 0x1F, 0x3F, 0x7F,
0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF,
0xFFFF, 0x1FFFF, 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF, 0x7FFFFF,
0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, /*fake*/ 1, 1, 1, 1, 1 };
/* sequence */
seq->litLength = LL_base[llCode] + BIT_getLowerBits(allBits, llBits);
@@ -792,8 +795,8 @@ static size_t ZSTD_decompressSequences(
ZSTD_decodeSequence(&sequence, &seqState, mls);
#if 0 /* for debug */
{ U32 pos = (U32)(op-base);
if ((pos > 10354000) && (pos < 10355000))
printf("pos %6u : %3u literals & match %3u bytes at distance %6u \n",
if ((pos > 23945280) && (pos < 23946797))
printf("Dpos %6u : %3u literals & match %3u bytes at distance %6u \n",
pos, (U32)sequence.litLength, (U32)sequence.matchLength, (U32)sequence.offset);
}
#endif