int ZSTD_maxCLevel(void);/*!< maximum compression level available */ +
int ZSTD_maxCLevel(void); /*!< maximum compression level available */ size_t ZSTD_compressBound(size_t srcSize); /*!< maximum compressed size in worst case scenario */ unsigned ZSTD_isError(size_t code); /*!< tells if a `size_t` function result is an error code */ const char* ZSTD_getErrorName(size_t code); /*!< provides readable string from an error code */ -
When compressing many times, - it is recommended to allocate a context just once, and re-use it for each successive compression operation. - This will make workload friendlier for system's memory. - Use one context per thread for parallel execution in multi-threaded environments. -
typedef struct ZSTD_CCtx_s ZSTD_CCtx; -ZSTD_CCtx* ZSTD_createCCtx(void); -size_t ZSTD_freeCCtx(ZSTD_CCtx* cctx); -
size_t ZSTD_compressCCtx(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel);Same as ZSTD_compress(), requires an allocated ZSTD_CCtx (see ZSTD_createCCtx()).
typedef struct ZSTD_DCtx_s ZSTD_DCtx; +Decompression context
typedef struct ZSTD_DCtx_s ZSTD_DCtx; ZSTD_DCtx* ZSTD_createDCtx(void); size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx); -
size_t ZSTD_decompressDCtx(ZSTD_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);Same as ZSTD_decompress(), requires an allocated ZSTD_DCtx (see ZSTD_createDCtx()).
typedef struct ZSTD_DCtx_s ZSTD
Start a new compression by initializing ZSTD_CStream.
Use ZSTD_initCStream() to start a new compression operation.
- Use ZSTD_initCStream_usingDict() for a compression which requires a dictionary.
+ Use ZSTD_initCStream_usingDict() or ZSTD_initCStream_usingCDict() for a compression which requires a dictionary (experimental section)
Use ZSTD_compressStream() repetitively to consume input stream.
The function will automatically update both `pos` fields.
Note that it may not consume the entire input, in which case `pos < size`,
and it's up to the caller to present again remaining data.
@return : a size hint, preferred nb of bytes to use as input for next function call
- (it's just a hint, to help latency a little, any other value will work fine)
- (note : the size hint is guaranteed to be <= ZSTD_CStreamInSize() )
or an error code, which can be tested using ZSTD_isError().
+ Note 1 : it's just a hint, to help latency a little, any other value will work fine.
+ Note 2 : size hint is guaranteed to be <= ZSTD_CStreamInSize()
- At any moment, it's possible to flush whatever data remains within buffer, using ZSTD_flushStream().
+ At any moment, it's possible to flush whatever data remains within internal buffer, using ZSTD_flushStream().
`output->pos` will be updated.
- Note some content might still be left within internal buffer if `output->size` is too small.
+ Note that some content might still be left within internal buffer if `output->size` is too small.
@return : nb of bytes still present within internal buffer (0 if it's empty)
or an error code, which can be tested using ZSTD_isError().
@@ -222,20 +214,12 @@ Decompression context
typedef struct ZSTD_DCtx_s ZSTD
The epilogue is required for decoders to consider a frame completed.
Similar to ZSTD_flushStream(), it may not be able to flush the full content if `output->size` is too small.
In which case, call again ZSTD_endStream() to complete the flush.
- @return : nb of bytes still present within internal buffer (0 if it's empty)
+ @return : nb of bytes still present within internal buffer (0 if it's empty, hence compression completed)
or an error code, which can be tested using ZSTD_isError().
-Streaming compression functions
typedef struct ZSTD_CStream_s ZSTD_CStream;
-ZSTD_CStream* ZSTD_createCStream(void);
-size_t ZSTD_freeCStream(ZSTD_CStream* zcs);
-size_t ZSTD_initCStream(ZSTD_CStream* zcs, int compressionLevel);
-size_t ZSTD_compressStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
-size_t ZSTD_flushStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output);
-size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output);
-
size_t ZSTD_CStreamInSize(void); /**< recommended size for input buffer */
size_t ZSTD_CStreamOutSize(void); /**< recommended size for output buffer. Guarantee to successfully flush at least one complete compressed block in all circumstances. */
@@ -261,12 +245,6 @@ Streaming compression functions
typedef struct ZSTD_C
-Streaming decompression functions
typedef struct ZSTD_DStream_s ZSTD_DStream;
-ZSTD_DStream* ZSTD_createDStream(void);
-size_t ZSTD_freeDStream(ZSTD_DStream* zds);
-size_t ZSTD_initDStream(ZSTD_DStream* zds);
-size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
-
size_t ZSTD_DStreamInSize(void); /*!< recommended size for input buffer */
size_t ZSTD_DStreamOutSize(void); /*!< recommended size for output buffer. Guarantee to successfully flush at least one complete block in all circumstances. */
@@ -303,10 +281,10 @@ Streaming decompression functions
typedef struct ZSTD
ZSTD_frameParameters fParams;
} ZSTD_parameters;
-Custom memory allocation functions
typedef void* (*ZSTD_allocFunction) (void* opaque, size_t size);
+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;
-
+
Advanced compression functions
size_t ZSTD_estimateCCtxSize(ZSTD_compressionParameters cParams);
@@ -331,14 +309,14 @@ Custom memory allocation functions
typedef void* (*ZS
Gives the amount of memory used by a given ZSTD_sizeof_CDict
-ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long srcSize, size_t dictSize);
- same as ZSTD_getCParams(), but @return a full `ZSTD_parameters` object instead of a `ZSTD_compressionParameters`.
- All fields of `ZSTD_frameParameters` are set to default (0)
+
ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long estimatedSrcSize, size_t dictSize);
+ @return ZSTD_compressionParameters structure for a selected compression level and estimated srcSize.
+ `estimatedSrcSize` value is optional, select 0 if not known
-ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long srcSize, size_t dictSize);
- @return ZSTD_compressionParameters structure for a selected compression level and srcSize.
- `srcSize` value is optional, select 0 if not known
+
ZSTD_parameters ZSTD_getParams(int compressionLevel, unsigned long long estimatedSrcSize, size_t dictSize);
+ same as ZSTD_getCParams(), but @return a full `ZSTD_parameters` object instead of sub-component `ZSTD_compressionParameters`.
+ All fields of `ZSTD_frameParameters` are set to default (0)
size_t ZSTD_checkCParams(ZSTD_compressionParameters params);
@@ -409,22 +387,23 @@ Custom memory allocation functions
typedef void* (*ZS
Advanced streaming functions
-Advanced Streaming compression functions
ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem);
+Advanced Streaming compression functions
ZSTD_CStream* ZSTD_createCStream_advanced(ZSTD_customMem customMem);
+size_t ZSTD_initCStream_srcSize(ZSTD_CStream* zcs, int compressionLevel, unsigned long long pledgedSrcSize); /**< pledgedSrcSize must be correct */
size_t ZSTD_initCStream_usingDict(ZSTD_CStream* zcs, const void* dict, size_t dictSize, int compressionLevel);
size_t ZSTD_initCStream_advanced(ZSTD_CStream* zcs, const void* dict, size_t dictSize,
ZSTD_parameters params, unsigned long long pledgedSrcSize); /**< pledgedSrcSize is optional and can be zero == unknown */
size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict); /**< note : cdict will just be referenced, and must outlive compression session */
size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize); /**< re-use compression parameters from previous init; skip dictionary loading stage; zcs must be init at least once before */
size_t ZSTD_sizeof_CStream(const ZSTD_CStream* zcs);
-
-Advanced Streaming decompression functions
typedef enum { ZSTDdsp_maxWindowSize } ZSTD_DStreamParameter_e;
+
+Advanced Streaming decompression functions
typedef enum { ZSTDdsp_maxWindowSize } ZSTD_DStreamParameter_e;
ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem);
size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize);
size_t ZSTD_setDStreamParameter(ZSTD_DStream* zds, ZSTD_DStreamParameter_e paramType, unsigned paramValue);
size_t ZSTD_initDStream_usingDDict(ZSTD_DStream* zds, const ZSTD_DDict* ddict); /**< note : ddict will just be referenced, and must outlive decompression session */
size_t ZSTD_resetDStream(ZSTD_DStream* zds); /**< re-use decompression parameters from previous init; saves dictionary loading */
size_t ZSTD_sizeof_DStream(const ZSTD_DStream* zds);
-
+
Buffer-less and synchronous inner streaming functions
This is an advanced API, giving full control over buffer management, for users which need direct control over memory.
But it's also a complex one, with many restrictions (documented below).
@@ -461,13 +440,13 @@ Advanced Streaming decompression functions
typedef en
You can then reuse `ZSTD_CCtx` (ZSTD_compressBegin()) to compress some new frame.
-Buffer-less streaming compression functions
size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel);
+Buffer-less streaming compression functions
size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, int compressionLevel);
size_t ZSTD_compressBegin_usingDict(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel);
size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* cctx, const void* dict, size_t dictSize, ZSTD_parameters params, unsigned long long pledgedSrcSize);
size_t ZSTD_copyCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx, unsigned long long pledgedSrcSize);
size_t ZSTD_compressContinue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
size_t ZSTD_compressEnd(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
-
+
Buffer-less streaming decompression (synchronous mode)
A ZSTD_DCtx object is required to track streaming operations.
Use ZSTD_createDCtx() / ZSTD_freeDCtx() to manage it.
@@ -511,7 +490,7 @@ Buffer-less streaming compression functions
size_t ZS
Note : it's possible to know if next input to present is a header or a block, using ZSTD_nextInputType().
This information is not required to properly decode a frame.
- == Special case : skippable frames ==
+ == Special case : skippable frames ==
Skippable frames allow integration of user-defined data into a flow of concatenated frames.
Skippable frames will be ignored (skipped) by a decompressor. The format of skippable frames is as follows :
@@ -530,7 +509,7 @@ Buffer-less streaming compression functions
size_t ZS
unsigned checksumFlag;
} ZSTD_frameParams;
-Buffer-less streaming decompression functions
size_t ZSTD_getFrameParams(ZSTD_frameParams* fparamsPtr, const void* src, size_t srcSize);
/**< doesn't consume input, see details below */
+Buffer-less streaming decompression functions
size_t ZSTD_getFrameParams(ZSTD_frameParams* fparamsPtr, const void* src, size_t srcSize); /**< doesn't consume input, see details below */
size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx);
size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize);
void ZSTD_copyDCtx(ZSTD_DCtx* dctx, const ZSTD_DCtx* preparedDCtx);
@@ -538,7 +517,7 @@ Buffer-less streaming decompression functions
size_t
size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
typedef enum { ZSTDnit_frameHeader, ZSTDnit_blockHeader, ZSTDnit_block, ZSTDnit_lastBlock, ZSTDnit_checksum, ZSTDnit_skippableFrame } ZSTD_nextInputType_e;
ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx);
-
+
Block functions
Block functions produce and decode raw zstd blocks, without frame metadata.
Frame metadata cost is typically ~18 bytes, which can be non-negligible for very small blocks (< 100 bytes).
@@ -563,10 +542,10 @@ Buffer-less streaming decompression functions
size_t
Use ZSTD_insertBlock() in such a case.
-Raw zstd block functions
size_t ZSTD_getBlockSizeMax(ZSTD_CCtx* cctx);
+Raw zstd block functions
size_t ZSTD_getBlockSizeMax(ZSTD_CCtx* cctx);
size_t ZSTD_compressBlock (ZSTD_CCtx* cctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize); /**< insert block into `dctx` history. Useful for uncompressed blocks */
-
+