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streaming compression : lazy parameter adaptation with stable input

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effectively makes ZSTD_c_stableInput compatible ZSTD_compressStream()
and zstd_e_continue operation mode.
This commit is contained in:
Yann Collet
2022-01-26 10:31:24 -08:00
parent 5684bae4f6
commit c0c5ffa973
2 changed files with 19 additions and 12 deletions
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lib/zstd.h
+3 -3
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@@ -1843,14 +1843,14 @@ ZSTDLIB_STATIC_API size_t ZSTD_CCtx_refPrefix_advanced(ZSTD_CCtx* cctx, const vo
* large enough to fit a block (see ZSTD_c_stableOutBuffer). This will also
* avoid the memcpy() from the input buffer to the input window buffer.
*
* NOTE: ZSTD_compressStream2() will error if ZSTD_e_end is not used.
* That means this flag cannot be used with ZSTD_compressStream().
* NOTE: ZSTD_compressStream2() will error if ZSTD_e_flush is used.
* That means this flag cannot be used with ZSTD_flushStream().
*
* NOTE: So long as the ZSTD_inBuffer always points to valid memory, using
* this flag is ALWAYS memory safe, and will never access out-of-bounds
* memory. However, compression WILL fail if you violate the preconditions.
*
* WARNING: The data in the ZSTD_inBuffer in the range [dst, dst + pos) MUST
* WARNING: The data in the ZSTD_inBuffer in the range [src, src + pos) MUST
* not be modified during compression or you will get data corruption. This
* is because zstd needs to reference data in the ZSTD_inBuffer to find
* matches. Normally zstd maintains its own window buffer for this purpose,