diff --git a/lib/zstd.h b/lib/zstd.h index 85b314ee..111516d0 100644 --- a/lib/zstd.h +++ b/lib/zstd.h @@ -109,7 +109,6 @@ ZSTDLIB_API const char* ZSTD_versionString(void); #define ZSTD_BLOCKSIZE_MAX (1<= first frame size * @return : the compressed size of the first frame starting at `src`, @@ -180,9 +179,9 @@ ZSTDLIB_API size_t ZSTD_findFrameCompressedSize(const void* src, size_t srcSize) ZSTDLIB_API size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size in worst case single-pass scenario */ ZSTDLIB_API unsigned ZSTD_isError(size_t code); /*!< tells if a `size_t` function result is an error code */ ZSTDLIB_API const char* ZSTD_getErrorName(size_t code); /*!< provides readable string from an error code */ -ZSTDLIB_API int ZSTD_minCLevel(void); /*!< minimum negative compression level allowed */ +ZSTDLIB_API int ZSTD_minCLevel(void); /*!< minimum negative compression level allowed, requires v1.4.0+ */ ZSTDLIB_API int ZSTD_maxCLevel(void); /*!< maximum compression level available */ -ZSTDLIB_API int ZSTD_defaultCLevel(void); /*!< default compression level, specified by ZSTD_CLEVEL_DEFAULT */ +ZSTDLIB_API int ZSTD_defaultCLevel(void); /*!< default compression level, specified by ZSTD_CLEVEL_DEFAULT, requires v1.5.0+ */ /*************************************** @@ -235,9 +234,9 @@ ZSTDLIB_API size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, const void* src, size_t srcSize); -/*************************************** -* Advanced compression API -***************************************/ +/********************************************* +* Advanced compression API (Requires v1.4.0+) +**********************************************/ /* API design : * Parameters are pushed one by one into an existing context, @@ -274,7 +273,7 @@ typedef enum { ZSTD_lcm_huffman = 1, /**< Always attempt Huffman compression. Uncompressed literals will still be * emitted if Huffman compression is not profitable. */ ZSTD_lcm_uncompressed = 2 /**< Always emit uncompressed literals. */ -} ZSTD_literalCompressionMode_e; +} ZSTD_literalCompressionMode_e; /* Requires v1.5.0+ */ typedef enum { @@ -341,7 +340,8 @@ typedef enum { * The higher the value of selected strategy, the more complex it is, * resulting in stronger and slower compression. * Special: value 0 means "use default strategy". */ - ZSTD_c_literalCompressionMode=108, /* Controls how the literals are compressed (default is auto). + ZSTD_c_literalCompressionMode=108, /* Note : requires v1.5.0+ + * Controls how the literals are compressed (default is auto). * The value must be of type ZSTD_literalCompressionMode_e. * See ZSTD_literalCompressionMode_e enum definition for details. */ @@ -534,9 +534,9 @@ ZSTDLIB_API size_t ZSTD_compress2( ZSTD_CCtx* cctx, const void* src, size_t srcSize); -/*************************************** -* Advanced decompression API -***************************************/ +/*********************************************** +* Advanced decompression API (Requires v1.4.0+) +************************************************/ /* The advanced API pushes parameters one by one into an existing DCtx context. * Parameters are sticky, and remain valid for all following frames @@ -698,7 +698,7 @@ typedef enum { : note : multithreaded compression will block to flush as much output as possible. */ } ZSTD_EndDirective; -/*! ZSTD_compressStream2() : +/*! ZSTD_compressStream2() : Requires v1.4.0+ * Behaves about the same as ZSTD_compressStream, with additional control on end directive. * - Compression parameters are pushed into CCtx before starting compression, using ZSTD_CCtx_set*() * - Compression parameters cannot be changed once compression is started (save a list of exceptions in multi-threading mode) @@ -744,11 +744,11 @@ ZSTDLIB_API size_t ZSTD_CStreamOutSize(void); /**< recommended size for output /* ***************************************************************************** - * This following is a legacy streaming API. + * This following is a legacy streaming API, available since v1.0+ . * It can be replaced by ZSTD_CCtx_reset() and ZSTD_compressStream2(). * It is redundant, but remains fully supported. - * Advanced parameters and dictionary compression can only be used through the - * new API. + * Streaming in combination with advanced parameters and dictionary compression + * can only be used through the new API. ******************************************************************************/ /*! @@ -909,25 +909,25 @@ ZSTDLIB_API size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx, * Dictionary helper functions *******************************/ -/*! ZSTD_getDictID_fromDict() : +/*! ZSTD_getDictID_fromDict() : Requires v1.4.0+ * Provides the dictID stored within dictionary. * if @return == 0, the dictionary is not conformant with Zstandard specification. * It can still be loaded, but as a content-only dictionary. */ ZSTDLIB_API unsigned ZSTD_getDictID_fromDict(const void* dict, size_t dictSize); -/*! ZSTD_getDictID_fromCDict() : +/*! ZSTD_getDictID_fromCDict() : Requires v1.5.0+ * Provides the dictID of the dictionary loaded into `cdict`. * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty. * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */ ZSTDLIB_API unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict); -/*! ZSTD_getDictID_fromDDict() : +/*! ZSTD_getDictID_fromDDict() : Requires v1.4.0+ * Provides the dictID of the dictionary loaded into `ddict`. * If @return == 0, the dictionary is not conformant to Zstandard specification, or empty. * Non-conformant dictionaries can still be loaded, but as content-only dictionaries. */ ZSTDLIB_API unsigned ZSTD_getDictID_fromDDict(const ZSTD_DDict* ddict); -/*! ZSTD_getDictID_fromFrame() : +/*! ZSTD_getDictID_fromFrame() : Requires v1.4.0+ * Provides the dictID required to decompressed the frame stored within `src`. * If @return == 0, the dictID could not be decoded. * This could for one of the following reasons : @@ -941,7 +941,7 @@ ZSTDLIB_API unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize); /******************************************************************************* - * Advanced dictionary and prefix API + * Advanced dictionary and prefix API (Requires v1.4.0+) * * This API allows dictionaries to be used with ZSTD_compress2(), * ZSTD_compressStream2(), and ZSTD_decompress(). Dictionaries are sticky, and @@ -950,7 +950,7 @@ ZSTDLIB_API unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize); ******************************************************************************/ -/*! ZSTD_CCtx_loadDictionary() : +/*! ZSTD_CCtx_loadDictionary() : Requires v1.4.0+ * Create an internal CDict from `dict` buffer. * Decompression will have to use same dictionary. * @result : 0, or an error code (which can be tested with ZSTD_isError()). @@ -969,7 +969,7 @@ ZSTDLIB_API unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize); * to precisely select how dictionary content must be interpreted. */ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, size_t dictSize); -/*! ZSTD_CCtx_refCDict() : +/*! ZSTD_CCtx_refCDict() : Requires v1.4.0+ * Reference a prepared dictionary, to be used for all next compressed frames. * Note that compression parameters are enforced from within CDict, * and supersede any compression parameter previously set within CCtx. @@ -983,7 +983,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary(ZSTD_CCtx* cctx, const void* dict, s * Note 2 : CDict is just referenced, its lifetime must outlive its usage within CCtx. */ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict); -/*! ZSTD_CCtx_refPrefix() : +/*! ZSTD_CCtx_refPrefix() : Requires v1.4.0+ * Reference a prefix (single-usage dictionary) for next compressed frame. * A prefix is **only used once**. Tables are discarded at end of frame (ZSTD_e_end). * Decompression will need same prefix to properly regenerate data. @@ -1004,7 +1004,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict); ZSTDLIB_API size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize); -/*! ZSTD_DCtx_loadDictionary() : +/*! ZSTD_DCtx_loadDictionary() : Requires v1.4.0+ * Create an internal DDict from dict buffer, * to be used to decompress next frames. * The dictionary remains valid for all future frames, until explicitly invalidated. @@ -1021,7 +1021,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, */ ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); -/*! ZSTD_DCtx_refDDict() : +/*! ZSTD_DCtx_refDDict() : Requires v1.4.0+ * Reference a prepared dictionary, to be used to decompress next frames. * The dictionary remains active for decompression of future frames using same DCtx. * @@ -1039,7 +1039,7 @@ ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, s */ ZSTDLIB_API size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict); -/*! ZSTD_DCtx_refPrefix() : +/*! ZSTD_DCtx_refPrefix() : Requires v1.4.0+ * Reference a prefix (single-usage dictionary) to decompress next frame. * This is the reverse operation of ZSTD_CCtx_refPrefix(), * and must use the same prefix as the one used during compression. @@ -1060,7 +1060,7 @@ ZSTDLIB_API size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, /* === Memory management === */ -/*! ZSTD_sizeof_*() : +/*! ZSTD_sizeof_*() : Requires v1.4.0+ * These functions give the _current_ memory usage of selected object. * Note that object memory usage can evolve (increase or decrease) over time. */ ZSTDLIB_API size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx); @@ -1904,7 +1904,7 @@ ZSTDLIB_API size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compre */ ZSTDLIB_API size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params); -/*! ZSTD_CCtxParams_setParameter() : +/*! ZSTD_CCtxParams_setParameter() : Requires v1.4.0+ * Similar to ZSTD_CCtx_setParameter. * Set one compression parameter, selected by enum ZSTD_cParameter. * Parameters must be applied to a ZSTD_CCtx using