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zstdmt: added ability to change compression parameters during compression

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This commit is contained in:
Yann Collet
2018-02-01 16:13:31 -08:00
parent 2bfc79ab8d
commit 60fa90b6c0
4 changed files with 49 additions and 8 deletions
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lib/compress/zstdmt_compress.h
+21 -6
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@@ -38,7 +38,7 @@ ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
/* === Simple buffer-to-butter one-pass function === */
/* === Simple one-pass compression function === */
ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
void* dst, size_t dstCapacity,
@@ -50,7 +50,7 @@ ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
/* === Streaming functions === */
ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize); /**< if srcSize is not known at reset time, use ZSTD_CONTENTSIZE_UNKNOWN. Note: for compatibility with older programs, 0 means the same as ZSTD_CONTENTSIZE_UNKNOWN, but it may change in the future, to mean "empty" */
ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize); /**< if srcSize is not known at reset time, use ZSTD_CONTENTSIZE_UNKNOWN. Note: for compatibility with older programs, 0 means the same as ZSTD_CONTENTSIZE_UNKNOWN, but it will change in the future to mean "empty" */
ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
@@ -68,7 +68,7 @@ ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const ZSTD_CDict* cdict,
ZSTD_parameters const params,
ZSTD_parameters params,
unsigned overlapLog);
ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,
@@ -109,15 +109,30 @@ ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
ZSTD_EndDirective endOp);
/* === Private definitions; never ever use directly === */
/* ========================================================
* === Private interface, for use by ZSTD_compress.c ===
* === Not exposed in libzstd. Never invoke directly ===
* ======================================================== */
size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value);
/* ZSTDMT_CCtxParam_setNbThreads()
* Set nbThreads, and clamp it correctly,
* also reset jobSize and overlapLog */
* Set nbThreads, and clamp it.
* Also reset jobSize and overlapLog */
size_t ZSTDMT_CCtxParam_setNbThreads(ZSTD_CCtx_params* params, unsigned nbThreads);
/*! ZSTDMT_MTCtx_setParametersUsingCCtxParams() :
* Apply a ZSTD_CCtx_params to the compression context.
* This works even during compression, and will be applied to next compression job.
* However, the following parameters will NOT be updated after compression has been started :
* - window size
* - pledgedSrcSize
* - nb threads
* - job size
* - overlap size
*/
void ZSTDMT_MTCtx_setParametersUsingCCtxParams(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* params);
/* ZSTDMT_getNbThreads():
* @return nb threads currently active in mtctx.
* mtctx must be valid */