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Merge pull request #1721 from facebook/seq127

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fixed very minor inefficiency (nbSeq==127)
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Yann Collet 2019-08-21 05:19:12 -07:00 committed by GitHub
commit fe0877c664
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1 changed files with 10 additions and 5 deletions
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15
lib/compress/zstd_compress.c
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@ -1981,12 +1981,17 @@ ZSTD_compressSequences_internal(seqStore_t* seqStorePtr,
/* Sequences Header */ /* Sequences Header */
RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/, RETURN_ERROR_IF((oend-op) < 3 /*max nbSeq Size*/ + 1 /*seqHead*/,
dstSize_tooSmall); dstSize_tooSmall);
if (nbSeq < 0x7F) if (nbSeq < 128) {
*op++ = (BYTE)nbSeq; *op++ = (BYTE)nbSeq;
else if (nbSeq < LONGNBSEQ) } else if (nbSeq < LONGNBSEQ) {
op[0] = (BYTE)((nbSeq>>8) + 0x80), op[1] = (BYTE)nbSeq, op+=2; op[0] = (BYTE)((nbSeq>>8) + 0x80);
else op[1] = (BYTE)nbSeq;
op[0]=0xFF, MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ)), op+=3; op+=2;
} else {
op[0]=0xFF;
MEM_writeLE16(op+1, (U16)(nbSeq - LONGNBSEQ));
op+=3;
}
assert(op <= oend); assert(op <= oend);
if (nbSeq==0) { if (nbSeq==0) {
/* Copy the old tables over as if we repeated them */ /* Copy the old tables over as if we repeated them */