AuroraMiddleware/lz4
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decompress_generic: drop partial copy check in fast loop

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We've already checked that we are more than FASTLOOP_SAFE_DISTANCE
away from the end, so this branch can never be true, we will have
already jumped to the second decode loop.
This commit is contained in:
Dave Watson 2019-01-25 14:47:15 -08:00
parent 59332a3026
commit 232f1e261f
1 changed files with 0 additions and 15 deletions
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15
lib/lz4.c
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@ -1632,20 +1632,6 @@ LZ4_decompress_generic(
/* partialDecoding : may not respect endBlock parsing restrictions */ /* partialDecoding : may not respect endBlock parsing restrictions */
assert(op<=oend); assert(op<=oend);
if (partialDecoding && (cpy > oend-MATCH_SAFEGUARD_DISTANCE)) {
size_t const mlen = MIN(length, (size_t)(oend-op));
const BYTE* const matchEnd = match + mlen;
BYTE* const copyEnd = op + mlen;
if (matchEnd > op) { /* overlap copy */
while (op < copyEnd) *op++ = *match++;
} else {
memcpy(op, match, mlen);
}
op = copyEnd;
if (op==oend) goto decode_done;
continue;
}
if (unlikely(offset<16)) { if (unlikely(offset<16)) {
if (offset < 8) { if (offset < 8) {
op[0] = match[0]; op[0] = match[0];
@ -1858,7 +1844,6 @@ LZ4_decompress_generic(
} }
op = cpy; /* wildcopy correction */ op = cpy; /* wildcopy correction */
} }
decode_done:
/* end of decoding */ /* end of decoding */
if (endOnInput) if (endOnInput)