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fix #942 : streaming interface does not compress after ZSTD_initCStream()

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While the final result is still, technically, a frame,
the resulting frame expands initial data instead of compressing it.
This is because the streaming API creates a tiny 1-byte buffer for input,
because it believes input is empty (0-bytes),
because in the past, 0 used to mean "unknown" instead.

This patch fixes the issue.
Todo : add a test which traps the issue.
This commit is contained in:
Yann Collet 2017-12-07 02:52:50 -05:00
parent 896980ec15
commit 3aa2b27a89
1 changed files with 3 additions and 1 deletions
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4
lib/compress/zstd_compress.c
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@ -2466,6 +2466,7 @@ size_t ZSTD_compress_usingCDict(ZSTD_CCtx* cctx,
ZSTD_CStream* ZSTD_createCStream(void)
{
DEBUGLOG(3, "ZSTD_createCStream");
return ZSTD_createCStream_advanced(ZSTD_defaultCMem);
}
@ -2633,7 +2634,8 @@ size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigne
size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel)
{
return ZSTD_initCStream_srcSize(zcs, compressionLevel, 0);
DEBUGLOG(4, "ZSTD_initCStream");
return ZSTD_initCStream_srcSize(zcs, compressionLevel, ZSTD_CONTENTSIZE_UNKNOWN);
}
/*====== Compression ======*/