Yann Collet
parent
3583d19c4e
commit
96d887429b
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@ -416,8 +416,8 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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ZSTD_c_windowLog=101, </b>/* Maximum allowed back-reference distance, expressed as power of 2.<b>
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* Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX.
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* Special: value 0 means "use default windowLog".
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* Note: Using a window size greater than 1<<ZSTD_WINDOWLOG_LIMIT_DEFAULT
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* requires explicitly allowing such window size during decompression stage if using streaming. */
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* Note: Using a windowLog greater than ZSTD_WINDOWLOG_LIMIT_DEFAULT
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* requires explicitly allowing such window size at decompression stage if using streaming. */
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ZSTD_c_hashLog=102, </b>/* Size of the initial probe table, as a power of 2.<b>
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* Resulting memory usage is (1 << (hashLog+2)).
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* Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX.
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@ -580,7 +580,7 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Special: Loading a NULL (or 0-size) dictionary invalidates previous dictionary,
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meaning "return to no-dictionary mode".
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Note 1 : Dictionary is sticky, it will be used for all future compression jobs.
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Note 1 : Dictionary is sticky, it will be used for all future compressed frames.
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To return to "no-dictionary" situation, load a NULL dictionary (or reset parameters).
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Note 2 : Loading a dictionary involves building tables.
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It's also a CPU consuming operation, with non-negligible impact on latency.
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@ -594,10 +594,10 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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</p></pre><BR>
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<pre><b>size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict);
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</b><p> Reference a prepared dictionary, to be used for all next compression jobs.
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</b><p> Reference a prepared dictionary, to be used for all next compressed frames.
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Note that compression parameters are enforced from within CDict,
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and supercede any compression parameter previously set within CCtx.
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The dictionary will remain valid for future compression jobs using same CCtx.
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The dictionary will remain valid for future compressed frames using same CCtx.
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@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Special : Referencing a NULL CDict means "return to no-dictionary mode".
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Note 1 : Currently, only one dictionary can be managed.
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@ -607,14 +607,14 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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<pre><b>size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx,
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const void* prefix, size_t prefixSize);
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</b><p> Reference a prefix (single-usage dictionary) for next compression job.
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</b><p> Reference a prefix (single-usage dictionary) for next compressed frame.
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A prefix is **only used once**. Tables are discarded at end of frame (ZSTD_e_end).
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Decompression will need same prefix to properly regenerate data.
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Compressing with a prefix is similar in outcome as performing a diff and compressing it,
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but performs much faster, especially during decompression (compression speed is tunable with compression level).
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Note that prefix is **only used once**. Tables are discarded at end of compression job (ZSTD_e_end).
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@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Special: Adding any prefix (including NULL) invalidates any previous prefix or dictionary
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Note 1 : Prefix buffer is referenced. It **must** outlive compression job.
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Note 1 : Prefix buffer is referenced. It **must** outlive compression.
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Its content must remain unmodified during compression.
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Note 2 : If the intention is to diff some large src data blob with some prior version of itself,
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ensure that the window size is large enough to contain the entire source.
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@ -764,14 +764,14 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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<pre><b>size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx,
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const void* prefix, size_t prefixSize);
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</b><p> Reference a prefix (single-usage dictionary) for next compression job.
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</b><p> Reference a prefix (single-usage dictionary) to decompress next frame.
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This is the reverse operation of ZSTD_CCtx_refPrefix(),
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and must use the same prefix as the one used during compression.
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Prefix is **only used once**. Reference is discarded at end of frame.
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End of frame is reached when ZSTD_decompressStream() returns 0.
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@result : 0, or an error code (which can be tested with ZSTD_isError()).
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Note 1 : Adding any prefix (including NULL) invalidates any previously set prefix or dictionary
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Note 2 : Prefix buffer is referenced. It **must** outlive decompression job.
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Note 2 : Prefix buffer is referenced. It **must** outlive decompression.
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Prefix buffer must remain unmodified up to the end of frame,
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reached when ZSTD_decompressStream() returns 0.
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Note 3 : By default, the prefix is treated as raw content (ZSTD_dm_rawContent).
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@ -1066,7 +1066,7 @@ size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params);
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- ZSTD_CCtx_setParametersUsingCCtxParams() : Apply parameters to
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an existing CCtx.
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These parameters will be applied to
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all subsequent compression jobs.
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all subsequent frames.
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- ZSTD_compressStream2() : Do compression using the CCtx.
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- ZSTD_freeCCtxParams() : Free the memory.
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@ -1228,7 +1228,7 @@ size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict);
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size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs, const ZSTD_CDict* cdict, ZSTD_frameParameters fParams, unsigned long long pledgedSrcSize); </b>/**< same as ZSTD_initCStream_usingCDict(), with control over frame parameters. pledgedSrcSize must be correct. If srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN. */<b>
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</pre></b><BR>
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<pre><b>size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize);
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</b><p> start a new compression job, using same parameters from previous job.
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</b><p> start a new frame, using same parameters from previous frame.
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This is typically useful to skip dictionary loading stage, since it will re-use it in-place.
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Note that zcs must be init at least once before using ZSTD_resetCStream().
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If pledgedSrcSize is not known at reset time, use macro ZSTD_CONTENTSIZE_UNKNOWN.
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28
lib/zstd.h
28
lib/zstd.h
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@ -481,7 +481,7 @@ ZSTDLIB_API size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
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/* API design :
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* Parameters are pushed one by one into an existing context,
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* using ZSTD_CCtx_set*() functions.
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* Pushed parameters are sticky : they are applied to next job, and any subsequent job.
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* Pushed parameters are sticky : they are valid for next compressed frame, and any subsequent frame.
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* "sticky" parameters are applicable to `ZSTD_compress2()` and `ZSTD_compressStream*()` !
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* They do not apply to "simple" one-shot variants such as ZSTD_compressCCtx()
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*
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@ -518,8 +518,8 @@ typedef enum {
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ZSTD_c_windowLog=101, /* Maximum allowed back-reference distance, expressed as power of 2.
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* Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX.
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* Special: value 0 means "use default windowLog".
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* Note: Using a window size greater than 1<<ZSTD_WINDOWLOG_LIMIT_DEFAULT
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* requires explicitly allowing such window size during decompression stage if using streaming. */
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* Note: Using a windowLog greater than ZSTD_WINDOWLOG_LIMIT_DEFAULT
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* requires explicitly allowing such window size at decompression stage if using streaming. */
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ZSTD_c_hashLog=102, /* Size of the initial probe table, as a power of 2.
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* Resulting memory usage is (1 << (hashLog+2)).
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* Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX.
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@ -683,7 +683,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long lo
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* @result : 0, or an error code (which can be tested with ZSTD_isError()).
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* Special: Loading a NULL (or 0-size) dictionary invalidates previous dictionary,
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* meaning "return to no-dictionary mode".
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* Note 1 : Dictionary is sticky, it will be used for all future compression jobs.
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* Note 1 : Dictionary is sticky, it will be used for all future compressed frames.
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* To return to "no-dictionary" situation, load a NULL dictionary (or reset parameters).
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* Note 2 : Loading a dictionary involves building tables.
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* It's also a CPU consuming operation, with non-negligible impact on latency.
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@ -697,10 +697,10 @@ ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long lo
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ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize);
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/*! ZSTD_CCtx_refCDict() :
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* Reference a prepared dictionary, to be used for all next compression jobs.
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* Reference a prepared dictionary, to be used for all next compressed frames.
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* Note that compression parameters are enforced from within CDict,
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* and supercede any compression parameter previously set within CCtx.
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* The dictionary will remain valid for future compression jobs using same CCtx.
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* The dictionary will remain valid for future compressed frames using same CCtx.
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* @result : 0, or an error code (which can be tested with ZSTD_isError()).
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* Special : Referencing a NULL CDict means "return to no-dictionary mode".
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* Note 1 : Currently, only one dictionary can be managed.
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@ -709,14 +709,14 @@ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, s
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ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict);
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/*! ZSTD_CCtx_refPrefix() :
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* Reference a prefix (single-usage dictionary) for next compression job.
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* Reference a prefix (single-usage dictionary) for next compressed frame.
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* A prefix is **only used once**. Tables are discarded at end of frame (ZSTD_e_end).
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* Decompression will need same prefix to properly regenerate data.
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* Compressing with a prefix is similar in outcome as performing a diff and compressing it,
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* but performs much faster, especially during decompression (compression speed is tunable with compression level).
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* Note that prefix is **only used once**. Tables are discarded at end of compression job (ZSTD_e_end).
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* @result : 0, or an error code (which can be tested with ZSTD_isError()).
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* Special: Adding any prefix (including NULL) invalidates any previous prefix or dictionary
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* Note 1 : Prefix buffer is referenced. It **must** outlive compression job.
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* Note 1 : Prefix buffer is referenced. It **must** outlive compression.
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* Its content must remain unmodified during compression.
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* Note 2 : If the intention is to diff some large src data blob with some prior version of itself,
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* ensure that the window size is large enough to contain the entire source.
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@ -810,7 +810,7 @@ ZSTDLIB_API size_t ZSTD_compressStream2( ZSTD_CCtx* cctx,
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/* ============================== */
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/* The advanced API pushes parameters one by one into an existing DCtx context.
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* Parameters are sticky, and remain valid for all following decompression jobs
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* Parameters are sticky, and remain valid for all following frames
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* using the same DCtx context.
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* It's possible to reset parameters to default values using ZSTD_DCtx_reset().
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* Note : This API is compatible with existing ZSTD_decompressDCtx() and ZSTD_decompressStream().
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@ -886,14 +886,14 @@ ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, s
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ZSTDLIB_API size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict);
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/*! ZSTD_DCtx_refPrefix() :
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* Reference a prefix (single-usage dictionary) for next compression job.
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* Reference a prefix (single-usage dictionary) to decompress next frame.
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* This is the reverse operation of ZSTD_CCtx_refPrefix(),
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* and must use the same prefix as the one used during compression.
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* Prefix is **only used once**. Reference is discarded at end of frame.
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* End of frame is reached when ZSTD_decompressStream() returns 0.
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* @result : 0, or an error code (which can be tested with ZSTD_isError()).
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* Note 1 : Adding any prefix (including NULL) invalidates any previously set prefix or dictionary
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* Note 2 : Prefix buffer is referenced. It **must** outlive decompression job.
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* Note 2 : Prefix buffer is referenced. It **must** outlive decompression.
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* Prefix buffer must remain unmodified up to the end of frame,
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* reached when ZSTD_decompressStream() returns 0.
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* Note 3 : By default, the prefix is treated as raw content (ZSTD_dm_rawContent).
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@ -1316,7 +1316,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_getParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param
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* - ZSTD_CCtx_setParametersUsingCCtxParams() : Apply parameters to
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* an existing CCtx.
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* These parameters will be applied to
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* all subsequent compression jobs.
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* all subsequent frames.
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* - ZSTD_compressStream2() : Do compression using the CCtx.
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* - ZSTD_freeCCtxParams() : Free the memory.
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*
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@ -1493,7 +1493,7 @@ ZSTDLIB_API size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDi
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ZSTDLIB_API size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs, const ZSTD_CDict* cdict, ZSTD_frameParameters fParams, unsigned long long pledgedSrcSize); /**< same as ZSTD_initCStream_usingCDict(), with control over frame parameters. pledgedSrcSize must be correct. If srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN. */
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/*! ZSTD_resetCStream() :
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* start a new compression job, using same parameters from previous job.
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* start a new frame, using same parameters from previous frame.
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* This is typically useful to skip dictionary loading stage, since it will re-use it in-place.
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* Note that zcs must be init at least once before using ZSTD_resetCStream().
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* If pledgedSrcSize is not known at reset time, use macro ZSTD_CONTENTSIZE_UNKNOWN.
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