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[lib] Take the shortcut when ZSTD_c_stableOutBuffer is set

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When we have a stable output buffer take the single-pass shortcut.
It is okay to return `dstSizeTooSmall` if the output buffer isn't
big enough, because we know it will never grow.
This commit is contained in:
Nick Terrell 2020-10-12 14:09:12 -07:00
parent 809b2f2071
commit 987cb4ca6a
1 changed files with 2 additions and 1 deletions
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3
lib/compress/zstd_compress.c
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@ -4064,7 +4064,8 @@ static size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
case zcss_load:
if ( (flushMode == ZSTD_e_end)
&& ((size_t)(oend-op) >= ZSTD_compressBound(iend-ip)) /* enough dstCapacity */
&& ( (size_t)(oend-op) >= ZSTD_compressBound(iend-ip) /* Enough output space */
|| zcs->appliedParams.outBufferMode == ZSTD_bm_stable) /* OR we are allowed to return dstSizeTooSmall */
&& (zcs->inBuffPos == 0) ) {
/* shortcut to compression pass directly into output buffer */
size_t const cSize = ZSTD_compressEnd(zcs,