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Update to LZ4 v1.7.5

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Tino Reichardt
2017-02-06 20:15:11 +01:00
parent f4f2729f08
commit 2e656cea76
7 changed files with 450 additions and 39 deletions
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23
C/lz4/lz4frame.h
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@@ -206,10 +206,11 @@ LZ4FLIB_API LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
/* Compression */
#define LZ4F_HEADER_SIZE_MAX 15
LZ4FLIB_API size_t LZ4F_compressBegin(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const LZ4F_preferences_t* prefsPtr);
/* LZ4F_compressBegin() :
* will write the frame header into dstBuffer.
* dstBuffer must be large enough to accommodate a header. Maximum header size is 15 bytes.
* dstCapacity must be large enough to store the header. Maximum header size is LZ4F_HEADER_SIZE_MAX bytes.
* `prefsPtr` is optional : you can provide NULL as argument, all preferences will then be set to default.
* @return : number of bytes written into dstBuffer for the header
* or an error code (which can be tested using LZ4F_isError())
@@ -217,20 +218,20 @@ LZ4FLIB_API size_t LZ4F_compressBegin(LZ4F_cctx* cctx, void* dstBuffer, size_t d
LZ4FLIB_API size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
/* LZ4F_compressBound() :
* Provides the minimum size of Dst buffer given srcSize to handle worst case situations.
* Different preferences can produce different results.
* prefsPtr is optional : you can provide NULL as argument, all preferences will then be set to cover worst case.
* This function includes frame termination cost (4 bytes, or 8 if frame checksum is enabled)
* Provides dstCapacity given a srcSize to guarantee operation success in worst case situations.
* prefsPtr is optional : you can provide NULL as argument, preferences will be set to cover worst case scenario.
* Result is always the same for a srcSize and prefsPtr, so it can be trusted to size reusable buffers.
* When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() operations.
*/
LZ4FLIB_API size_t LZ4F_compressUpdate(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* cOptPtr);
/* LZ4F_compressUpdate() :
* LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
* An important rule is that dstBuffer MUST be large enough (dstCapacity) to ensure compression completion even in worst case.
* This value is provided by using LZ4F_compressBound().
* An important rule is that dstCapacity MUST be large enough to ensure operation success even in worst case situations.
* This value is provided by LZ4F_compressBound().
* If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
* LZ4F_compressUpdate() doesn't guarantee error recovery. When an error occurs, compression context must be freed or resized.
* `cOptPtr` is optional : it's possible to provide NULL, all options will be set to default.
* `cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
* @return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
* or an error code if it fails (which can be tested using LZ4F_isError())
*/
@@ -245,12 +246,12 @@ LZ4FLIB_API size_t LZ4F_flush(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapaci
* or an error code if it fails (which can be tested using LZ4F_isError())
*/
LZ4FLIB_API size_t LZ4F_compressEnd(LZ4F_cctx* cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr);
LZ4FLIB_API size_t LZ4F_compressEnd(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const LZ4F_compressOptions_t* cOptPtr);
/* LZ4F_compressEnd() :
* To properly finish the compressed frame, invoke LZ4F_compressEnd().
* To properly finish an LZ4 frame, invoke LZ4F_compressEnd().
* It will flush whatever data remained within `cctx` (like LZ4_flush())
* and properly finalize the frame, with an endMark and a checksum.
* `cOptPtr` is optional : it's possible to provide NULL, all options will be set to default.
* `cOptPtr` is optional : NULL can be provided, in which case all options will be set to default.
* @return : number of bytes written into dstBuffer (necessarily >= 4 (endMark), or 8 if optional frame checksum is enabled)
* or an error code if it fails (which can be tested using LZ4F_isError())
* A successful call to LZ4F_compressEnd() makes `cctx` available again for another compression task.