diff options
Diffstat (limited to 'lib/zstd.h')
| -rw-r--r-- | lib/zstd.h | 508 |
1 files changed, 254 insertions, 254 deletions
diff --git a/lib/zstd.h b/lib/zstd.h index 9ac0a73dceb6..6405da602e8f 100644 --- a/lib/zstd.h +++ b/lib/zstd.h @@ -45,11 +45,11 @@ extern "C" { Levels >= 20, labeled `--ultra`, should be used with caution, as they require more memory. Compression can be done in: - a single step (described as Simple API) - - a single step, reusing a context (described as Explicit memory management) + - a single step, reusing a context (described as Explicit context) - unbounded multiple steps (described as Streaming compression) The compression ratio achievable on small data can be highly improved using a dictionary in: - a single step (described as Simple dictionary API) - - a single step, reusing a dictionary (described as Fast dictionary API) + - a single step, reusing a dictionary (described as Bulk-processing dictionary API) Advanced experimental functions can be accessed using #define ZSTD_STATIC_LINKING_ONLY before including zstd.h. Advanced experimental APIs shall never be used with a dynamic library. @@ -59,7 +59,7 @@ extern "C" { /*------ Version ------*/ #define ZSTD_VERSION_MAJOR 1 #define ZSTD_VERSION_MINOR 3 -#define ZSTD_VERSION_RELEASE 3 +#define ZSTD_VERSION_RELEASE 4 #define ZSTD_VERSION_NUMBER (ZSTD_VERSION_MAJOR *100*100 + ZSTD_VERSION_MINOR *100 + ZSTD_VERSION_RELEASE) ZSTDLIB_API unsigned ZSTD_versionNumber(void); /**< useful to check dll version */ @@ -68,7 +68,7 @@ ZSTDLIB_API unsigned ZSTD_versionNumber(void); /**< useful to check dll versio #define ZSTD_QUOTE(str) #str #define ZSTD_EXPAND_AND_QUOTE(str) ZSTD_QUOTE(str) #define ZSTD_VERSION_STRING ZSTD_EXPAND_AND_QUOTE(ZSTD_LIB_VERSION) -ZSTDLIB_API const char* ZSTD_versionString(void); /* v1.3.0 */ +ZSTDLIB_API const char* ZSTD_versionString(void); /* added in v1.3.0 */ /*************************************** @@ -92,7 +92,7 @@ ZSTDLIB_API size_t ZSTD_compress( void* dst, size_t dstCapacity, ZSTDLIB_API size_t ZSTD_decompress( void* dst, size_t dstCapacity, const void* src, size_t compressedSize); -/*! ZSTD_getFrameContentSize() : v1.3.0 +/*! ZSTD_getFrameContentSize() : added in v1.3.0 * `src` should point to the start of a ZSTD encoded frame. * `srcSize` must be at least as large as the frame header. * hint : any size >= `ZSTD_frameHeaderSize_max` is large enough. @@ -120,26 +120,24 @@ ZSTDLIB_API unsigned long long ZSTD_getFrameContentSize(const void *src, size_t /*! ZSTD_getDecompressedSize() : * NOTE: This function is now obsolete, in favor of ZSTD_getFrameContentSize(). - * Both functions work the same way, - * but ZSTD_getDecompressedSize() blends - * "empty", "unknown" and "error" results in the same return value (0), - * while ZSTD_getFrameContentSize() distinguishes them. - * - * 'src' is the start of a zstd compressed frame. - * @return : content size to be decompressed, as a 64-bits value _if known and not empty_, 0 otherwise. */ + * Both functions work the same way, but ZSTD_getDecompressedSize() blends + * "empty", "unknown" and "error" results to the same return value (0), + * while ZSTD_getFrameContentSize() gives them separate return values. + * `src` is the start of a zstd compressed frame. + * @return : content size to be decompressed, as a 64-bits value _if known and not empty_, 0 otherwise. */ ZSTDLIB_API unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize); /*====== Helper functions ======*/ #define ZSTD_COMPRESSBOUND(srcSize) ((srcSize) + ((srcSize)>>8) + (((srcSize) < (128<<10)) ? (((128<<10) - (srcSize)) >> 11) /* margin, from 64 to 0 */ : 0)) /* this formula ensures that bound(A) + bound(B) <= bound(A+B) as long as A and B >= 128 KB */ -ZSTDLIB_API size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size in worst case scenario */ +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_maxCLevel(void); /*!< maximum compression level available */ /*************************************** -* Explicit memory management +* Explicit context ***************************************/ /*= Compression context * When compressing many times, @@ -345,7 +343,7 @@ ZSTDLIB_API size_t ZSTD_CStreamOutSize(void); /**< recommended size for output * *******************************************************************************/ typedef ZSTD_DCtx ZSTD_DStream; /**< DCtx and DStream are now effectively same object (>= v1.3.0) */ - /* Continue to distinguish them for compatibility with versions <= v1.2.0 */ + /* For compatibility with versions <= v1.2.0, continue to consider them separated. */ /*===== ZSTD_DStream management functions =====*/ ZSTDLIB_API ZSTD_DStream* ZSTD_createDStream(void); ZSTDLIB_API size_t ZSTD_freeDStream(ZSTD_DStream* zds); @@ -375,23 +373,24 @@ ZSTDLIB_API size_t ZSTD_DStreamOutSize(void); /*!< recommended size for output /* --- Constants ---*/ #define ZSTD_MAGICNUMBER 0xFD2FB528 /* >= v0.8.0 */ #define ZSTD_MAGIC_SKIPPABLE_START 0x184D2A50U -#define ZSTD_MAGIC_DICTIONARY 0xEC30A437 /* v0.7+ */ +#define ZSTD_MAGIC_DICTIONARY 0xEC30A437 /* >= v0.7.0 */ #define ZSTD_WINDOWLOG_MAX_32 30 #define ZSTD_WINDOWLOG_MAX_64 31 #define ZSTD_WINDOWLOG_MAX ((unsigned)(sizeof(size_t) == 4 ? ZSTD_WINDOWLOG_MAX_32 : ZSTD_WINDOWLOG_MAX_64)) #define ZSTD_WINDOWLOG_MIN 10 -#define ZSTD_HASHLOG_MAX MIN(ZSTD_WINDOWLOG_MAX, 30) +#define ZSTD_HASHLOG_MAX ((ZSTD_WINDOWLOG_MAX < 30) ? ZSTD_WINDOWLOG_MAX : 30) #define ZSTD_HASHLOG_MIN 6 -#define ZSTD_CHAINLOG_MAX MIN(ZSTD_WINDOWLOG_MAX+1, 30) +#define ZSTD_CHAINLOG_MAX_32 29 +#define ZSTD_CHAINLOG_MAX_64 30 +#define ZSTD_CHAINLOG_MAX ((unsigned)(sizeof(size_t) == 4 ? ZSTD_CHAINLOG_MAX_32 : ZSTD_CHAINLOG_MAX_64)) #define ZSTD_CHAINLOG_MIN ZSTD_HASHLOG_MIN #define ZSTD_HASHLOG3_MAX 17 #define ZSTD_SEARCHLOG_MAX (ZSTD_WINDOWLOG_MAX-1) #define ZSTD_SEARCHLOG_MIN 1 #define ZSTD_SEARCHLENGTH_MAX 7 /* only for ZSTD_fast, other strategies are limited to 6 */ #define ZSTD_SEARCHLENGTH_MIN 3 /* only for ZSTD_btopt, other strategies are limited to 4 */ -#define ZSTD_TARGETLENGTH_MIN 4 /* only useful for btopt */ -#define ZSTD_TARGETLENGTH_MAX 999 /* only useful for btopt */ +#define ZSTD_TARGETLENGTH_MIN 1 /* only used by btopt, btultra and btfast */ #define ZSTD_LDM_MINMATCH_MIN 4 #define ZSTD_LDM_MINMATCH_MAX 4096 #define ZSTD_LDM_BUCKETSIZELOG_MAX 8 @@ -432,12 +431,17 @@ typedef struct { typedef struct ZSTD_CCtx_params_s ZSTD_CCtx_params; -/*--- Custom memory allocation functions ---*/ -typedef void* (*ZSTD_allocFunction) (void* opaque, size_t size); -typedef void (*ZSTD_freeFunction) (void* opaque, void* address); -typedef struct { ZSTD_allocFunction customAlloc; ZSTD_freeFunction customFree; void* opaque; } ZSTD_customMem; -/* use this constant to defer to stdlib's functions */ -static ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL }; +typedef enum { + ZSTD_dct_auto=0, /* dictionary is "full" when starting with ZSTD_MAGIC_DICTIONARY, otherwise it is "rawContent" */ + ZSTD_dct_rawContent, /* ensures dictionary is always loaded as rawContent, even if it starts with ZSTD_MAGIC_DICTIONARY */ + ZSTD_dct_fullDict /* refuses to load a dictionary if it does not respect Zstandard's specification */ +} ZSTD_dictContentType_e; + +typedef enum { + ZSTD_dlm_byCopy = 0, /**< Copy dictionary content internally */ + ZSTD_dlm_byRef, /**< Reference dictionary content -- the dictionary buffer must outlive its users. */ +} ZSTD_dictLoadMethod_e; + /*************************************** @@ -483,12 +487,12 @@ ZSTDLIB_API size_t ZSTD_frameHeaderSize(const void* src, size_t srcSize); /*************************************** -* Context memory usage +* Memory management ***************************************/ /*! ZSTD_sizeof_*() : * These functions give the current memory usage of selected object. - * Object memory usage can evolve when re-used multiple times. */ + * Object memory usage can evolve when re-used. */ ZSTDLIB_API size_t ZSTD_sizeof_CCtx(const ZSTD_CCtx* cctx); ZSTDLIB_API size_t ZSTD_sizeof_DCtx(const ZSTD_DCtx* dctx); ZSTDLIB_API size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs); @@ -503,8 +507,8 @@ ZSTDLIB_API size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict); * It will also consider src size to be arbitrarily "large", which is worst case. * If srcSize is known to always be small, ZSTD_estimateCCtxSize_usingCParams() can provide a tighter estimation. * ZSTD_estimateCCtxSize_usingCParams() can be used in tandem with ZSTD_getCParams() to create cParams from compressionLevel. - * ZSTD_estimateCCtxSize_usingCCtxParams() can be used in tandem with ZSTD_CCtxParam_setParameter(). Only single-threaded compression is supported. This function will return an error code if ZSTD_p_nbThreads is > 1. - * Note : CCtx estimation is only correct for single-threaded compression */ + * ZSTD_estimateCCtxSize_usingCCtxParams() can be used in tandem with ZSTD_CCtxParam_setParameter(). Only single-threaded compression is supported. This function will return an error code if ZSTD_p_nbWorkers is >= 1. + * Note : CCtx size estimation is only correct for single-threaded compression. */ ZSTDLIB_API size_t ZSTD_estimateCCtxSize(int compressionLevel); ZSTDLIB_API size_t ZSTD_estimateCCtxSize_usingCParams(ZSTD_compressionParameters cParams); ZSTDLIB_API size_t ZSTD_estimateCCtxSize_usingCCtxParams(const ZSTD_CCtx_params* params); @@ -515,8 +519,8 @@ ZSTDLIB_API size_t ZSTD_estimateDCtxSize(void); * It will also consider src size to be arbitrarily "large", which is worst case. * If srcSize is known to always be small, ZSTD_estimateCStreamSize_usingCParams() can provide a tighter estimation. * ZSTD_estimateCStreamSize_usingCParams() can be used in tandem with ZSTD_getCParams() to create cParams from compressionLevel. - * ZSTD_estimateCStreamSize_usingCCtxParams() can be used in tandem with ZSTD_CCtxParam_setParameter(). Only single-threaded compression is supported. This function will return an error code if ZSTD_p_nbThreads is set to a value > 1. - * Note : CStream estimation is only correct for single-threaded compression. + * ZSTD_estimateCStreamSize_usingCCtxParams() can be used in tandem with ZSTD_CCtxParam_setParameter(). Only single-threaded compression is supported. This function will return an error code if ZSTD_p_nbWorkers is >= 1. + * Note : CStream size estimation is only correct for single-threaded compression. * ZSTD_DStream memory budget depends on window Size. * This information can be passed manually, using ZSTD_estimateDStreamSize, * or deducted from a valid frame Header, using ZSTD_estimateDStreamSize_fromFrame(); @@ -529,84 +533,92 @@ ZSTDLIB_API size_t ZSTD_estimateCStreamSize_usingCCtxParams(const ZSTD_CCtx_para ZSTDLIB_API size_t ZSTD_estimateDStreamSize(size_t windowSize); ZSTDLIB_API size_t ZSTD_estimateDStreamSize_fromFrame(const void* src, size_t srcSize); -typedef enum { - ZSTD_dlm_byCopy = 0, /**< Copy dictionary content internally */ - ZSTD_dlm_byRef, /**< Reference dictionary content -- the dictionary buffer must outlive its users. */ -} ZSTD_dictLoadMethod_e; - /*! ZSTD_estimate?DictSize() : * ZSTD_estimateCDictSize() will bet that src size is relatively "small", and content is copied, like ZSTD_createCDict(). - * ZSTD_estimateCStreamSize_advanced_usingCParams() makes it possible to control precisely compression parameters, like ZSTD_createCDict_advanced(). - * Note : dictionary created by reference using ZSTD_dlm_byRef are smaller + * ZSTD_estimateCDictSize_advanced() makes it possible to control compression parameters precisely, like ZSTD_createCDict_advanced(). + * Note : dictionaries created by reference (`ZSTD_dlm_byRef`) are logically smaller. */ ZSTDLIB_API size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel); ZSTDLIB_API size_t ZSTD_estimateCDictSize_advanced(size_t dictSize, ZSTD_compressionParameters cParams, ZSTD_dictLoadMethod_e dictLoadMethod); ZSTDLIB_API size_t ZSTD_estimateDDictSize(size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod); - -/*************************************** -* Advanced compression functions -***************************************/ -/*! ZSTD_createCCtx_advanced() : - * Create a ZSTD compression context using external alloc and free functions */ -ZSTDLIB_API ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem); - -/*! ZSTD_initStaticCCtx() : initialize a fixed-size zstd compression context - * workspace: The memory area to emplace the context into. - * Provided pointer must 8-bytes aligned. - * It must outlive context usage. - * workspaceSize: Use ZSTD_estimateCCtxSize() or ZSTD_estimateCStreamSize() - * to determine how large workspace must be to support scenario. - * @return : pointer to ZSTD_CCtx* (same address as workspace, but different type), - * or NULL if error (typically size too small) - * Note : zstd will never resize nor malloc() when using a static cctx. - * If it needs more memory than available, it will simply error out. +/*! ZSTD_initStatic*() : + * Initialize an object using a pre-allocated fixed-size buffer. + * workspace: The memory area to emplace the object into. + * Provided pointer *must be 8-bytes aligned*. + * Buffer must outlive object. + * workspaceSize: Use ZSTD_estimate*Size() to determine + * how large workspace must be to support target scenario. + * @return : pointer to object (same address as workspace, just different type), + * or NULL if error (size too small, incorrect alignment, etc.) + * Note : zstd will never resize nor malloc() when using a static buffer. + * If the object requires more memory than available, + * zstd will just error out (typically ZSTD_error_memory_allocation). * Note 2 : there is no corresponding "free" function. - * Since workspace was allocated externally, it must be freed externally too. - * Limitation 1 : currently not compatible with internal CDict creation, such as - * ZSTD_CCtx_loadDictionary() or ZSTD_initCStream_usingDict(). - * Limitation 2 : currently not compatible with multi-threading + * Since workspace is allocated externally, it must be freed externally too. + * Note 3 : cParams : use ZSTD_getCParams() to convert a compression level + * into its associated cParams. + * Limitation 1 : currently not compatible with internal dictionary creation, triggered by + * ZSTD_CCtx_loadDictionary(), ZSTD_initCStream_usingDict() or ZSTD_initDStream_usingDict(). + * Limitation 2 : static cctx currently not compatible with multi-threading. + * Limitation 3 : static dctx is incompatible with legacy support. */ -ZSTDLIB_API ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize); +ZSTDLIB_API ZSTD_CCtx* ZSTD_initStaticCCtx(void* workspace, size_t workspaceSize); +ZSTDLIB_API ZSTD_CStream* ZSTD_initStaticCStream(void* workspace, size_t workspaceSize); /**< same as ZSTD_initStaticCCtx() */ +ZSTDLIB_API ZSTD_DCtx* ZSTD_initStaticDCtx(void* workspace, size_t workspaceSize); +ZSTDLIB_API ZSTD_DStream* ZSTD_initStaticDStream(void* workspace, size_t workspaceSize); /**< same as ZSTD_initStaticDCtx() */ -/*! ZSTD_createCDict_byReference() : - * Create a digested dictionary for compression - * Dictionary content is simply referenced, and therefore stays in dictBuffer. - * It is important that dictBuffer outlives CDict, it must remain read accessible throughout the lifetime of CDict */ -ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_byReference(const void* dictBuffer, size_t dictSize, int compressionLevel); +ZSTDLIB_API const ZSTD_CDict* ZSTD_initStaticCDict( + void* workspace, size_t workspaceSize, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_compressionParameters cParams); + +ZSTDLIB_API const ZSTD_DDict* ZSTD_initStaticDDict( + void* workspace, size_t workspaceSize, + const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType); + +/*! Custom memory allocation : + * These prototypes make it possible to pass your own allocation/free functions. + * ZSTD_customMem is provided at creation time, using ZSTD_create*_advanced() variants listed below. + * All allocation/free operations will be completed using these custom variants instead of regular <stdlib.h> ones. + */ +typedef void* (*ZSTD_allocFunction) (void* opaque, size_t size); +typedef void (*ZSTD_freeFunction) (void* opaque, void* address); +typedef struct { ZSTD_allocFunction customAlloc; ZSTD_freeFunction customFree; void* opaque; } ZSTD_customMem; +static ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL }; /**< this constant defers to stdlib's functions */ + +ZSTDLIB_API ZSTD_CCtx* ZSTD_createCCtx_advanced(ZSTD_customMem customMem); +ZSTDLIB_API ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem); +ZSTDLIB_API ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem); +ZSTDLIB_API ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem); -typedef enum { ZSTD_dm_auto=0, /* dictionary is "full" if it starts with ZSTD_MAGIC_DICTIONARY, otherwise it is "rawContent" */ - ZSTD_dm_rawContent, /* ensures dictionary is always loaded as rawContent, even if it starts with ZSTD_MAGIC_DICTIONARY */ - ZSTD_dm_fullDict /* refuses to load a dictionary if it does not respect Zstandard's specification */ -} ZSTD_dictMode_e; -/*! ZSTD_createCDict_advanced() : - * Create a ZSTD_CDict using external alloc and free, and customized compression parameters */ ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced(const void* dict, size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod, - ZSTD_dictMode_e dictMode, + ZSTD_dictContentType_e dictContentType, ZSTD_compressionParameters cParams, ZSTD_customMem customMem); -/*! ZSTD_initStaticCDict() : - * Generate a digested dictionary in provided memory area. - * workspace: The memory area to emplace the dictionary into. - * Provided pointer must 8-bytes aligned. - * It must outlive dictionary usage. - * workspaceSize: Use ZSTD_estimateCDictSize() - * to determine how large workspace must be. - * cParams : use ZSTD_getCParams() to transform a compression level - * into its relevants cParams. - * @return : pointer to ZSTD_CDict* (same address as workspace, but different type), - * or NULL if error (typically, size too small). - * Note : there is no corresponding "free" function. - * Since workspace was allocated externally, it must be freed externally. - */ -ZSTDLIB_API ZSTD_CDict* ZSTD_initStaticCDict( - void* workspace, size_t workspaceSize, - const void* dict, size_t dictSize, - ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictMode_e dictMode, - ZSTD_compressionParameters cParams); +ZSTDLIB_API ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize, + ZSTD_dictLoadMethod_e dictLoadMethod, + ZSTD_dictContentType_e dictContentType, + ZSTD_customMem customMem); + + + +/*************************************** +* Advanced compression functions +***************************************/ + +/*! ZSTD_createCDict_byReference() : + * Create a digested dictionary for compression + * Dictionary content is simply referenced, and therefore stays in dictBuffer. + * It is important that dictBuffer outlives CDict, it must remain read accessible throughout the lifetime of CDict */ +ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_byReference(const void* dictBuffer, size_t dictSize, int compressionLevel); /*! ZSTD_getCParams() : * @return ZSTD_compressionParameters structure for a selected compression level and estimated srcSize. @@ -652,28 +664,6 @@ ZSTDLIB_API size_t ZSTD_compress_usingCDict_advanced(ZSTD_CCtx* cctx, * Note 3 : Skippable Frame Identifiers are considered valid. */ ZSTDLIB_API unsigned ZSTD_isFrame(const void* buffer, size_t size); -/*! ZSTD_createDCtx_advanced() : - * Create a ZSTD decompression context using external alloc and free functions */ -ZSTDLIB_API ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem); - -/*! ZSTD_initStaticDCtx() : initialize a fixed-size zstd decompression context - * workspace: The memory area to emplace the context into. - * Provided pointer must 8-bytes aligned. - * It must outlive context usage. - * workspaceSize: Use ZSTD_estimateDCtxSize() or ZSTD_estimateDStreamSize() - * to determine how large workspace must be to support scenario. - * @return : pointer to ZSTD_DCtx* (same address as workspace, but different type), - * or NULL if error (typically size too small) - * Note : zstd will never resize nor malloc() when using a static dctx. - * If it needs more memory than available, it will simply error out. - * Note 2 : static dctx is incompatible with legacy support - * Note 3 : there is no corresponding "free" function. - * Since workspace was allocated externally, it must be freed externally. - * Limitation : currently not compatible with internal DDict creation, - * such as ZSTD_initDStream_usingDict(). - */ -ZSTDLIB_API ZSTD_DCtx* ZSTD_initStaticDCtx(void* workspace, size_t workspaceSize); - /*! ZSTD_createDDict_byReference() : * Create a digested dictionary, ready to start decompression operation without startup delay. * Dictionary content is referenced, and therefore stays in dictBuffer. @@ -681,26 +671,6 @@ ZSTDLIB_API ZSTD_DCtx* ZSTD_initStaticDCtx(void* workspace, size_t workspaceSize * it must remain read accessible throughout the lifetime of DDict */ ZSTDLIB_API ZSTD_DDict* ZSTD_createDDict_byReference(const void* dictBuffer, size_t dictSize); -/*! ZSTD_createDDict_advanced() : - * Create a ZSTD_DDict using external alloc and free, optionally by reference */ -ZSTDLIB_API ZSTD_DDict* ZSTD_createDDict_advanced(const void* dict, size_t dictSize, - ZSTD_dictLoadMethod_e dictLoadMethod, - ZSTD_customMem customMem); - -/*! ZSTD_initStaticDDict() : - * Generate a digested dictionary in provided memory area. - * workspace: The memory area to emplace the dictionary into. - * Provided pointer must 8-bytes aligned. - * It must outlive dictionary usage. - * workspaceSize: Use ZSTD_estimateDDictSize() - * to determine how large workspace must be. - * @return : pointer to ZSTD_DDict*, or NULL if error (size too small) - * Note : there is no corresponding "free" function. - * Since workspace was allocated externally, it must be freed externally. - */ -ZSTDLIB_API ZSTD_DDict* ZSTD_initStaticDDict(void* workspace, size_t workspaceSize, - const void* dict, size_t dictSize, - ZSTD_dictLoadMethod_e dictLoadMethod); /*! ZSTD_getDictID_fromDict() : * Provides the dictID stored within dictionary. @@ -732,8 +702,6 @@ ZSTDLIB_API unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize); ********************************************************************/ /*===== Advanced Streaming compression functions =====*/ -ZSTDLIB_API ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem); -ZSTDLIB_API ZSTD_CStream* ZSTD_initStaticCStream(void* workspace, size_t workspaceSize); /**< same as ZSTD_initStaticCCtx() */ ZSTDLIB_API size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pledgedSrcSize); /**< pledgedSrcSize must be correct. If it is not known at init time, use ZSTD_CONTENTSIZE_UNKNOWN. Note that, for compatibility with older programs, "0" also disables frame content size field. It may be enabled in the future. */ ZSTDLIB_API size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel); /**< creates of an internal CDict (incompatible with static CCtx), except if dict == NULL or dictSize < 8, in which case no dict is used. Note: dict is loaded with ZSTD_dm_auto (treated as a full zstd dictionary if it begins with ZSTD_MAGIC_DICTIONARY, else as raw content) and ZSTD_dlm_byCopy.*/ ZSTDLIB_API size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs, const void* dict, size_t dictSize, @@ -748,14 +716,28 @@ ZSTDLIB_API size_t ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs, const * If pledgedSrcSize is not known at reset time, use macro ZSTD_CONTENTSIZE_UNKNOWN. * If pledgedSrcSize > 0, its value must be correct, as it will be written in header, and controlled at the end. * For the time being, pledgedSrcSize==0 is interpreted as "srcSize unknown" for compatibility with older programs, - * but it may change to mean "empty" in some future version, so prefer using macro ZSTD_CONTENTSIZE_UNKNOWN. + * but it will change to mean "empty" in future version, so use macro ZSTD_CONTENTSIZE_UNKNOWN instead. * @return : 0, or an error code (which can be tested using ZSTD_isError()) */ ZSTDLIB_API size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize); +typedef struct { + unsigned long long ingested; + unsigned long long consumed; + unsigned long long produced; +} ZSTD_frameProgression; + +/* ZSTD_getFrameProgression(): + * tells how much data has been ingested (read from input) + * consumed (input actually compressed) and produced (output) for current frame. + * Therefore, (ingested - consumed) is amount of input data buffered internally, not yet compressed. + * Can report progression inside worker threads (multi-threading and non-blocking mode). + */ +ZSTD_frameProgression ZSTD_getFrameProgression(const ZSTD_CCtx* cctx); + + + /*===== Advanced Streaming decompression functions =====*/ -ZSTDLIB_API ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem); -ZSTDLIB_API ZSTD_DStream* ZSTD_initStaticDStream(void* workspace, size_t workspaceSize); /**< same as ZSTD_initStaticDCtx() */ typedef enum { DStream_p_maxWindowSize } ZSTD_DStreamParameter_e; ZSTDLIB_API size_t ZSTD_setDStreamParameter(ZSTD_DStream* zds, ZSTD_DStreamParameter_e paramType, unsigned paramValue); /* obsolete : this API will be removed in a future version */ ZSTDLIB_API size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize); /**< note: no dictionary will be used if dict == NULL or dictSize < 8 */ @@ -924,10 +906,8 @@ ZSTDLIB_API ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx); * and then applied on all subsequent compression jobs. * When no parameter is ever provided, CCtx is created with compression level ZSTD_CLEVEL_DEFAULT. * - * This API is intended to replace all others experimental API. - * It can basically do all other use cases, and even new ones. - * In constrast with _advanced() variants, it stands a reasonable chance to become "stable", - * after a good testing period. + * This API is intended to replace all others advanced / experimental API entry points. + * But it stands a reasonable chance to become "stable", after a reasonable testing period. */ /* note on naming convention : @@ -944,12 +924,12 @@ ZSTDLIB_API ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx); * All enum will be pinned to explicit values before reaching "stable API" status */ typedef enum { - /* Question : should we have a format ZSTD_f_auto ? - * For the time being, it would mean exactly the same as ZSTD_f_zstd1. - * But, in the future, should several formats be supported, + /* Opened question : should we have a format ZSTD_f_auto ? + * Today, it would mean exactly the same as ZSTD_f_zstd1. + * But, in the future, should several formats become supported, * on the compression side, it would mean "default format". - * On the decompression side, it would mean "multi format", - * and ZSTD_f_zstd1 could be reserved to mean "accept *only* zstd frames". + * On the decompression side, it would mean "automatic format detection", + * so that ZSTD_f_zstd1 would mean "accept *only* zstd frames". * Since meaning is a little different, another option could be to define different enums for compression and decompression. * This question could be kept for later, when there are actually multiple formats to support, * but there is also the question of pinning enum values, and pinning value `0` is especially important */ @@ -967,42 +947,76 @@ typedef enum { /* compression parameters */ ZSTD_p_compressionLevel=100, /* Update all compression parameters according to pre-defined cLevel table * Default level is ZSTD_CLEVEL_DEFAULT==3. - * Special: value 0 means "do not change cLevel". */ + * Special: value 0 means "do not change cLevel". + * Note 1 : it's possible to pass a negative compression level by casting it to unsigned type. + * Note 2 : setting a level sets all default values of other compression parameters. + * Note 3 : setting compressionLevel automatically updates ZSTD_p_compressLiterals. */ ZSTD_p_windowLog, /* Maximum allowed back-reference distance, expressed as power of 2. * Must be clamped between ZSTD_WINDOWLOG_MIN and ZSTD_WINDOWLOG_MAX. - * Special: value 0 means "do not change windowLog". + * Special: value 0 means "use default windowLog". * Note: Using a window size greater than ZSTD_MAXWINDOWSIZE_DEFAULT (default: 2^27) - * requires setting the maximum window size at least as large during decompression. */ + * requires explicitly allowing such window size during decompression stage. */ ZSTD_p_hashLog, /* Size of the probe table, as a power of 2. * Resulting table size is (1 << (hashLog+2)). * Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX. * Larger tables improve compression ratio of strategies <= dFast, * and improve speed of strategies > dFast. - * Special: value 0 means "do not change hashLog". */ + * Special: value 0 means "use default hashLog". */ ZSTD_p_chainLog, /* Size of the full-search table, as a power of 2. * Resulting table size is (1 << (chainLog+2)). * Larger tables result in better and slower compression. * This parameter is useless when using "fast" strategy. - * Special: value 0 means "do not change chainLog". */ + * Special: value 0 means "use default chainLog". */ ZSTD_p_searchLog, /* Number of search attempts, as a power of 2. * More attempts result in better and slower compression. * This parameter is useless when using "fast" and "dFast" strategies. - * Special: value 0 means "do not change searchLog". */ + * Special: value 0 means "use default searchLog". */ ZSTD_p_minMatch, /* Minimum size of searched matches (note : repCode matches can be smaller). * Larger values make faster compression and decompression, but decrease ratio. * Must be clamped between ZSTD_SEARCHLENGTH_MIN and ZSTD_SEARCHLENGTH_MAX. * Note that currently, for all strategies < btopt, effective minimum is 4. - * Note that currently, for all strategies > fast, effective maximum is 6. - * Special: value 0 means "do not change minMatchLength". */ - ZSTD_p_targetLength, /* Only useful for strategies >= btopt. - * Length of Match considered "good enough" to stop search. - * Larger values make compression stronger and slower. - * Special: value 0 means "do not change targetLength". */ + * , for all strategies > fast, effective maximum is 6. + * Special: value 0 means "use default minMatchLength". */ + ZSTD_p_targetLength, /* Impact of this field depends on strategy. + * For strategies btopt & btultra: + * Length of Match considered "good enough" to stop search. + * Larger values make compression stronger, and slower. + * For strategy fast: + * Distance between match sampling. + * Larger values make compression faster, and weaker. + * Special: value 0 means "use default targetLength". */ ZSTD_p_compressionStrategy, /* See ZSTD_strategy enum definition. * Cast selected strategy as unsigned for ZSTD_CCtx_setParameter() compatibility. * The higher the value of selected strategy, the more complex it is, * resulting in stronger and slower compression. - * Special: value 0 means "do not change strategy". */ + * Special: value 0 means "use default strategy". */ + + ZSTD_p_enableLongDistanceMatching=160, /* Enable long distance matching. + * This parameter is designed to improve compression ratio + * for large inputs, by finding large matches at long distance. + * It increases memory usage and window size. + * Note: enabling this parameter increases ZSTD_p_windowLog to 128 MB + * except when expressly set to a different value. */ + ZSTD_p_ldmHashLog, /* Size of the table for long distance matching, as a power of 2. + * Larger values increase memory usage and compression ratio, + * but decrease compression speed. + * Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX + * default: windowlog - 7. + * Special: value 0 means "automatically determine hashlog". */ + ZSTD_p_ldmMinMatch, /* Minimum match size for long distance matcher. + * Larger/too small values usually decrease compression ratio. + * Must be clamped between ZSTD_LDM_MINMATCH_MIN and ZSTD_LDM_MINMATCH_MAX. + * Special: value 0 means "use default value" (default: 64). */ + ZSTD_p_ldmBucketSizeLog, /* Log size of each bucket in the LDM hash table for collision resolution. + * Larger values improve collision resolution but decrease compression speed. + * The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX . + * Special: value 0 means "use default value" (default: 3). */ + ZSTD_p_ldmHashEveryLog, /* Frequency of inserting/looking up entries in the LDM hash table. + * Must be clamped between 0 and (ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN). + * Default is MAX(0, (windowLog - ldmHashLog)), optimizing hash table usage. + * Larger values improve compression speed. + * Deviating far from default value will likely result in a compression ratio decrease. + * Special: value 0 means "automatically determine hashEveryLog". */ /* frame parameters */ ZSTD_p_contentSizeFlag=200, /* Content size will be written into frame header _whenever known_ (default:1) @@ -1012,58 +1026,45 @@ typedef enum { ZSTD_p_dictIDFlag, /* When applicable, dictionary's ID is written into frame header (default:1) */ /* multi-threading parameters */ - ZSTD_p_nbThreads=400, /* Select how many threads a compression job can spawn (default:1) - * More threads improve speed, but also increase memory usage. - * Can only receive a value > 1 if ZSTD_MULTITHREAD is enabled. - * Special: value 0 means "do not change nbThreads" */ - ZSTD_p_jobSize, /* Size of a compression job. This value is only enforced in streaming (non-blocking) mode. - * Each compression job is completed in parallel, so indirectly controls the nb of active threads. + /* These parameters are only useful if multi-threading is enabled (ZSTD_MULTITHREAD). + * They return an error otherwise. */ + ZSTD_p_nbWorkers=400, /* Select how many threads will be spawned to compress in parallel. + * When nbWorkers >= 1, triggers asynchronous mode : + * ZSTD_compress_generic() consumes some input, flush some output if possible, and immediately gives back control to caller, + * while compression work is performed in parallel, within worker threads. + * (note : a strong exception to this rule is when first invocation sets ZSTD_e_end : it becomes a blocking call). + * More workers improve speed, but also increase memory usage. + * Default value is `0`, aka "single-threaded mode" : no worker is spawned, compression is performed inside Caller's thread, all invocations are blocking */ + ZSTD_p_jobSize, /* Size of a compression job. This value is enforced only in non-blocking mode. + * Each compression job is completed in parallel, so this value indirectly controls the nb of active threads. * 0 means default, which is dynamically determined based on compression parameters. - * Job size must be a minimum of overlapSize, or 1 KB, whichever is largest + * Job size must be a minimum of overlapSize, or 1 MB, whichever is largest. * The minimum size is automatically and transparently enforced */ ZSTD_p_overlapSizeLog, /* Size of previous input reloaded at the beginning of each job. * 0 => no overlap, 6(default) => use 1/8th of windowSize, >=9 => use full windowSize */ - /* advanced parameters - may not remain available after API update */ + /* =================================================================== */ + /* experimental parameters - no stability guaranteed */ + /* =================================================================== */ + + ZSTD_p_compressLiterals=1000, /* control huffman compression of literals (enabled) by default. + * disabling it improves speed and decreases compression ratio by a large amount. + * note : this setting is automatically updated when changing compression level. + * positive compression levels set ZSTD_p_compressLiterals to 1. + * negative compression levels set ZSTD_p_compressLiterals to 0. */ + ZSTD_p_forceMaxWindow=1100, /* Force back-reference distances to remain < windowSize, * even when referencing into Dictionary content (default:0) */ - ZSTD_p_enableLongDistanceMatching=1200, /* Enable long distance matching. - * This parameter is designed to improve the compression - * ratio for large inputs with long distance matches. - * This increases the memory usage as well as window size. - * Note: setting this parameter sets all the LDM parameters - * as well as ZSTD_p_windowLog. It should be set after - * ZSTD_p_compressionLevel and before ZSTD_p_windowLog and - * other LDM parameters. Setting the compression level - * after this parameter overrides the window log, though LDM - * will remain enabled until explicitly disabled. */ - ZSTD_p_ldmHashLog, /* Size of the table for long distance matching, as a power of 2. - * Larger values increase memory usage and compression ratio, but decrease - * compression speed. - * Must be clamped between ZSTD_HASHLOG_MIN and ZSTD_HASHLOG_MAX - * (default: windowlog - 7). */ - ZSTD_p_ldmMinMatch, /* Minimum size of searched matches for long distance matcher. - * Larger/too small values usually decrease compression ratio. - * Must be clamped between ZSTD_LDM_MINMATCH_MIN - * and ZSTD_LDM_MINMATCH_MAX (default: 64). */ - ZSTD_p_ldmBucketSizeLog, /* Log size of each bucket in the LDM hash table for collision resolution. - * Larger values usually improve collision resolution but may decrease - * compression speed. - * The maximum value is ZSTD_LDM_BUCKETSIZELOG_MAX (default: 3). */ - ZSTD_p_ldmHashEveryLog, /* Frequency of inserting/looking up entries in the LDM hash table. - * The default is MAX(0, (windowLog - ldmHashLog)) to - * optimize hash table usage. - * Larger values improve compression speed. Deviating far from the - * default value will likely result in a decrease in compression ratio. - * Must be clamped between 0 and ZSTD_WINDOWLOG_MAX - ZSTD_HASHLOG_MIN. */ } ZSTD_cParameter; /*! ZSTD_CCtx_setParameter() : * Set one compression parameter, selected by enum ZSTD_cParameter. + * Setting a parameter is generally only possible during frame initialization (before starting compression), + * except for a few exceptions which can be updated during compression: compressionLevel, hashLog, chainLog, searchLog, minMatch, targetLength and strategy. * Note : when `value` is an enum, cast it to unsigned for proper type checking. - * @result : informational value (typically, the one being set, possibly corrected), + * @result : informational value (typically, value being set clamped correctly), * or an error code (which can be tested with ZSTD_isError()). */ ZSTDLIB_API size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, unsigned value); @@ -1079,26 +1080,24 @@ ZSTDLIB_API size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param ZSTDLIB_API size_t ZSTD_CCtx_setPledgedSrcSize(ZSTD_CCtx* cctx, unsigned long long pledgedSrcSize); /*! ZSTD_CCtx_loadDictionary() : - * Create an internal CDict from dict buffer. - * Decompression will have to use same buffer. + * 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()). - * Special : Adding a NULL (or 0-size) dictionary invalidates any previous dictionary, - * meaning "return to no-dictionary mode". - * Note 1 : `dict` content will be copied internally. Use - * ZSTD_CCtx_loadDictionary_byReference() to reference dictionary - * content instead. The dictionary buffer must then outlive its - * users. + * Special: Adding a NULL (or 0-size) dictionary invalidates previous dictionary, + * meaning "return to no-dictionary mode". + * Note 1 : Dictionary will be used for all future compression jobs. + * To return to "no-dictionary" situation, load a NULL dictionary * Note 2 : Loading a dictionary involves building tables, which are dependent on compression parameters. * For this reason, compression parameters cannot be changed anymore after loading a dictionary. - * It's also a CPU-heavy operation, with non-negligible impact on latency. - * Note 3 : Dictionary will be used for all future compression jobs. - * To return to "no-dictionary" situation, load a NULL dictionary - * Note 5 : Use ZSTD_CCtx_loadDictionary_advanced() to select how dictionary - * content will be interpreted. - */ + * It's also a CPU consuming operation, with non-negligible impact on latency. + * Note 3 :`dict` content will be copied internally. + * Use ZSTD_CCtx_loadDictionary_byReference() to reference dictionary content instead. + * In such a case, dictionary buffer must outlive its users. + * Note 4 : Use ZSTD_CCtx_loadDictionary_advanced() + * 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); ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_byReference(ZSTD_CCtx* cctx, const void* dict, size_t dictSize); -ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_advanced(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictMode_e dictMode); +ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_advanced(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType); /*! ZSTD_CCtx_refCDict() : @@ -1110,8 +1109,7 @@ ZSTDLIB_API size_t ZSTD_CCtx_loadDictionary_advanced(ZSTD_CCtx* cctx, const void * Special : adding a NULL CDict means "return to no-dictionary mode". * Note 1 : Currently, only one dictionary can be managed. * Adding a new dictionary effectively "discards" any previous one. - * Note 2 : CDict is just referenced, its lifetime must outlive CCtx. - */ + * Note 2 : CDict is just referenced, its lifetime must outlive CCtx. */ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict); /*! ZSTD_CCtx_refPrefix() : @@ -1121,20 +1119,29 @@ ZSTDLIB_API size_t ZSTD_CCtx_refCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict); * Subsequent compression jobs will be done without prefix (if none is explicitly referenced). * If there is a need to use same prefix multiple times, consider embedding it into a ZSTD_CDict instead. * @result : 0, or an error code (which can be tested with ZSTD_isError()). - * Special : Adding any prefix (including NULL) invalidates any previous prefix or dictionary + * Special: Adding any prefix (including NULL) invalidates any previous prefix or dictionary * Note 1 : Prefix buffer is referenced. It must outlive compression job. * Note 2 : Referencing a prefix involves building tables, which are dependent on compression parameters. - * It's a CPU-heavy operation, with non-negligible impact on latency. - * Note 3 : By default, the prefix is treated as raw content - * (ZSTD_dm_rawContent). Use ZSTD_CCtx_refPrefix_advanced() to alter - * dictMode. */ + * It's a CPU consuming operation, with non-negligible impact on latency. + * Note 3 : By default, the prefix is treated as raw content (ZSTD_dm_rawContent). + * Use ZSTD_CCtx_refPrefix_advanced() to alter dictMode. */ ZSTDLIB_API size_t ZSTD_CCtx_refPrefix(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize); -ZSTDLIB_API size_t ZSTD_CCtx_refPrefix_advanced(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictMode_e dictMode); +ZSTDLIB_API size_t ZSTD_CCtx_refPrefix_advanced(ZSTD_CCtx* cctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType); + +/*! ZSTD_CCtx_reset() : + * Return a CCtx to clean state. + * Useful after an error, or to interrupt an ongoing compression job and start a new one. + * Any internal data not yet flushed is cancelled. + * Dictionary (if any) is dropped. + * All parameters are back to default values. + * It's possible to modify compression parameters after a reset. + */ +ZSTDLIB_API void ZSTD_CCtx_reset(ZSTD_CCtx* cctx); typedef enum { - ZSTD_e_continue=0, /* collect more data, encoder transparently decides when to output result, for optimal conditions */ + ZSTD_e_continue=0, /* collect more data, encoder decides when to output compressed result, for optimal conditions */ ZSTD_e_flush, /* flush any data provided so far - frame will continue, future data can still reference previous data for better compression */ ZSTD_e_end /* flush any remaining data and close current frame. Any additional data starts a new frame. */ } ZSTD_EndDirective; @@ -1150,10 +1157,11 @@ typedef enum { * and then immediately returns, just indicating that there is some data remaining to be flushed. * The function nonetheless guarantees forward progress : it will return only after it reads or write at least 1+ byte. * - Exception : in multi-threading mode, if the first call requests a ZSTD_e_end directive, it is blocking : it will complete compression before giving back control to caller. - * - @return provides the minimum amount of data remaining to be flushed from internal buffers + * - @return provides a minimum amount of data remaining to be flushed from internal buffers * or an error code, which can be tested using ZSTD_isError(). * if @return != 0, flush is not fully completed, there is still some data left within internal buffers. - * This is useful to determine if a ZSTD_e_flush or ZSTD_e_end directive is completed. + * This is useful for ZSTD_e_flush, since in this case more flushes are necessary to empty all buffers. + * For ZSTD_e_end, @return == 0 when internal buffers are fully flushed and frame is completed. * - after a ZSTD_e_end directive, if internal buffer is not fully flushed (@return != 0), * only ZSTD_e_end or ZSTD_e_flush operations are allowed. * Before starting a new compression job, or changing compression parameters, @@ -1164,16 +1172,6 @@ ZSTDLIB_API size_t ZSTD_compress_generic (ZSTD_CCtx* cctx, ZSTD_inBuffer* input, ZSTD_EndDirective endOp); -/*! ZSTD_CCtx_reset() : - * Return a CCtx to clean state. - * Useful after an error, or to interrupt an ongoing compression job and start a new one. - * Any internal data not yet flushed is cancelled. - * Dictionary (if any) is dropped. - * All parameters are back to default values. - * It's possible to modify compression parameters after a reset. - */ -ZSTDLIB_API void ZSTD_CCtx_reset(ZSTD_CCtx* cctx); /* Not ready yet ! */ - /*! ZSTD_compress_generic_simpleArgs() : * Same as ZSTD_compress_generic(), @@ -1207,25 +1205,26 @@ ZSTDLIB_API size_t ZSTD_compress_generic_simpleArgs ( * for static allocation for single-threaded compression. */ ZSTDLIB_API ZSTD_CCtx_params* ZSTD_createCCtxParams(void); +ZSTDLIB_API size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params); -/*! ZSTD_resetCCtxParams() : - * Reset params to default, with the default compression level. + +/*! ZSTD_CCtxParams_reset() : + * Reset params to default values. */ -ZSTDLIB_API size_t ZSTD_resetCCtxParams(ZSTD_CCtx_params* params); +ZSTDLIB_API size_t ZSTD_CCtxParams_reset(ZSTD_CCtx_params* params); -/*! ZSTD_initCCtxParams() : +/*! ZSTD_CCtxParams_init() : * Initializes the compression parameters of cctxParams according to * compression level. All other parameters are reset to their default values. */ -ZSTDLIB_API size_t ZSTD_initCCtxParams(ZSTD_CCtx_params* cctxParams, int compressionLevel); +ZSTDLIB_API size_t ZSTD_CCtxParams_init(ZSTD_CCtx_params* cctxParams, int compressionLevel); -/*! ZSTD_initCCtxParams_advanced() : +/*! ZSTD_CCtxParams_init_advanced() : * Initializes the compression and frame parameters of cctxParams according to * params. All other parameters are reset to their default values. */ -ZSTDLIB_API size_t ZSTD_initCCtxParams_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params); +ZSTDLIB_API size_t ZSTD_CCtxParams_init_advanced(ZSTD_CCtx_params* cctxParams, ZSTD_parameters params); -ZSTDLIB_API size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params); /*! ZSTD_CCtxParam_setParameter() : * Similar to ZSTD_CCtx_setParameter. @@ -1238,9 +1237,10 @@ ZSTDLIB_API size_t ZSTD_CCtxParam_setParameter(ZSTD_CCtx_params* params, ZSTD_cP /*! ZSTD_CCtx_setParametersUsingCCtxParams() : * Apply a set of ZSTD_CCtx_params to the compression context. - * This must be done before the dictionary is loaded. - * The pledgedSrcSize is treated as unknown. - * Multithreading parameters are applied only if nbThreads > 1. + * This can be done even after compression is started, + * if nbWorkers==0, this will have no impact until a new compression is started. + * if nbWorkers>=1, new parameters will be picked up at next job, + * with a few restrictions (windowLog, pledgedSrcSize, nbWorkers, jobSize, and overlapLog are not updated). */ ZSTDLIB_API size_t ZSTD_CCtx_setParametersUsingCCtxParams( ZSTD_CCtx* cctx, const ZSTD_CCtx_params* params); @@ -1267,9 +1267,9 @@ ZSTDLIB_API size_t ZSTD_CCtx_setParametersUsingCCtxParams( * Note 3 : Use ZSTD_DCtx_loadDictionary_advanced() to select * how dictionary content will be interpreted and loaded. */ -ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); /* not implemented */ -ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary_byReference(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); /* not implemented */ -ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx, const void* dict, size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictMode_e dictMode); /* not implemented */ +ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); +ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary_byReference(ZSTD_DCtx* dctx, const void* dict, size_t dictSize); +ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx, const void* dict, size_t dictSize, ZSTD_dictLoadMethod_e dictLoadMethod, ZSTD_dictContentType_e dictContentType); /*! ZSTD_DCtx_refDDict() : @@ -1281,7 +1281,7 @@ ZSTDLIB_API size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx, const void * Special : adding a NULL DDict means "return to no-dictionary mode". * Note 2 : DDict is just referenced, its lifetime must outlive its usage from DCtx. */ -ZSTDLIB_API size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict); /* not implemented */ +ZSTDLIB_API size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict); /*! ZSTD_DCtx_refPrefix() : @@ -1295,8 +1295,8 @@ ZSTDLIB_API size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict); * Use ZSTD_CCtx_refPrefix_advanced() to alter dictMode. * Note 4 : Referencing a raw content prefix has almost no cpu nor memory cost. */ -ZSTDLIB_API size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize); /* not implemented */ -ZSTDLIB_API size_t ZSTD_DCtx_refPrefix_advanced(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize, ZSTD_dictMode_e dictMode); /* not implemented */ +ZSTDLIB_API size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize); +ZSTDLIB_API size_t ZSTD_DCtx_refPrefix_advanced(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType); /*! ZSTD_DCtx_setMaxWindowSize() : @@ -1389,7 +1389,7 @@ ZSTDLIB_API void ZSTD_DCtx_reset(ZSTD_DCtx* dctx); ZSTDLIB_API size_t ZSTD_getBlockSize (const ZSTD_CCtx* cctx); ZSTDLIB_API size_t ZSTD_compressBlock (ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); ZSTDLIB_API size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize); -ZSTDLIB_API size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize); /**< insert uncompressed block into `dctx` history. Useful for multi-blocks decompression */ +ZSTDLIB_API size_t ZSTD_insertBlock (ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize); /**< insert uncompressed block into `dctx` history. Useful for multi-blocks decompression. */ #endif /* ZSTD_H_ZSTD_STATIC_LINKING_ONLY */ |