diff options
Diffstat (limited to 'lib/lz4frame.h')
| -rw-r--r-- | lib/lz4frame.h | 52 |
1 files changed, 27 insertions, 25 deletions
diff --git a/lib/lz4frame.h b/lib/lz4frame.h index e29f84a..01a756a 100644 --- a/lib/lz4frame.h +++ b/lib/lz4frame.h @@ -91,7 +91,7 @@ size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* prefere size_t LZ4F_compressFrame(void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_preferences_t* preferencesPtr); /* LZ4F_compressFrame() - * Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.4.1. + * Compress an entire srcBuffer into a valid LZ4 frame, as defined by specification v1.5 * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. * You can get the minimum value of dstMaxSize by using LZ4F_compressFrameBound() * If this condition is not respected, LZ4F_compressFrame() will fail (result is an errorCode) @@ -115,8 +115,8 @@ typedef struct { /* Resource Management */ #define LZ4F_VERSION 100 -LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* LZ4F_compressionContextPtr, unsigned version); -LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_compressionContext); +LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* cctxPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t cctx); /* LZ4F_createCompressionContext() : * The first thing to do is to create a compressionContext object, which will be used in all compression operations. * This is achieved using LZ4F_createCompressionContext(), which takes as argument a version and an LZ4F_preferences_t structure. @@ -129,7 +129,7 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_comp /* Compression */ -size_t LZ4F_compressBegin(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* preferencesPtr); +size_t LZ4F_compressBegin(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_preferences_t* prefsPtr); /* LZ4F_compressBegin() : * will write the frame header into dstBuffer. * dstBuffer must be large enough to accommodate a header (dstMaxSize). Maximum header size is 15 bytes. @@ -138,14 +138,14 @@ size_t LZ4F_compressBegin(LZ4F_compressionContext_t compressionContext, void* ds * or an error code (can be tested using LZ4F_isError()) */ -size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr); +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. - * preferencesPtr is optional : you can provide NULL as argument, all preferences will then be set to default. + * prefsPtr is optional : you can provide NULL as argument, all preferences will then be set to default. * Note that different preferences will produce in different results. */ -size_t LZ4F_compressUpdate(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* compressOptionsPtr); +size_t LZ4F_compressUpdate(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, 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. * The most important rule is that dstBuffer MUST be large enough (dstMaxSize) to ensure compression completion even in worst case. @@ -156,17 +156,18 @@ size_t LZ4F_compressUpdate(LZ4F_compressionContext_t compressionContext, void* d * The function outputs an error code if it fails (can be tested using LZ4F_isError()) */ -size_t LZ4F_flush(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr); +size_t LZ4F_flush(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr); /* LZ4F_flush() - * Should you need to create compressed data immediately, without waiting for a block to be filled, - * you can call LZ4_flush(), which will immediately compress any remaining data buffered within compressionContext. - * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. + * Should you need to generate compressed data immediately, without waiting for the current block to be filled, + * you can call LZ4_flush(), which will immediately compress any remaining data buffered within cctx. + * Note that dstMaxSize must be large enough to ensure the operation will be successful. + * LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. * The result of the function is the number of bytes written into dstBuffer - * (it can be zero, this means there was no data left within compressionContext) + * (it can be zero, this means there was no data left within cctx) * The function outputs an error code if it fails (can be tested using LZ4F_isError()) */ -size_t LZ4F_compressEnd(LZ4F_compressionContext_t compressionContext, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* compressOptionsPtr); +size_t LZ4F_compressEnd(LZ4F_compressionContext_t cctx, void* dstBuffer, size_t dstMaxSize, const LZ4F_compressOptions_t* cOptPtr); /* LZ4F_compressEnd() * When you want to properly finish the compressed frame, just call LZ4F_compressEnd(). * It will flush whatever data remained within compressionContext (like LZ4_flush()) @@ -174,7 +175,7 @@ size_t LZ4F_compressEnd(LZ4F_compressionContext_t compressionContext, void* dstB * The result of the function is the number of bytes written into dstBuffer (necessarily >= 4 (endMark size)) * The function outputs an error code if it fails (can be tested using LZ4F_isError()) * The LZ4F_compressOptions_t structure is optional : you can provide NULL as argument. - * compressionContext can then be used again, starting with LZ4F_compressBegin(). + * A successful call to LZ4F_compressEnd() makes cctx available again for future compression work. */ @@ -192,21 +193,21 @@ typedef struct { /* Resource management */ -LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_decompressionContext_t* ctxPtr, unsigned version); -LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t ctx); +LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_decompressionContext_t* dctxPtr, unsigned version); +LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_decompressionContext_t dctx); /* LZ4F_createDecompressionContext() : - * The first thing to do is to create a decompressionContext object, which will be used in all decompression operations. + * The first thing to do is to create an LZ4F_decompressionContext_t object, which will be used in all decompression operations. * This is achieved using LZ4F_createDecompressionContext(). - * The version provided MUST be LZ4F_VERSION. It is intended to track potential version differences between different binaries. + * The version provided MUST be LZ4F_VERSION. It is intended to track potential breaking differences between different versions. * The function will provide a pointer to a fully allocated and initialized LZ4F_decompressionContext_t object. - * If the result LZ4F_errorCode_t is not OK_NoError, there was an error during context creation. - * Object can release its memory using LZ4F_freeDecompressionContext(); + * The result is an errorCode, which can be tested using LZ4F_isError(). + * dctx memory can be released using LZ4F_freeDecompressionContext(); */ /* Decompression */ -size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t ctx, +size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t dctx, LZ4F_frameInfo_t* frameInfoPtr, const void* srcBuffer, size_t* srcSizePtr); /* LZ4F_getFrameInfo() @@ -220,10 +221,10 @@ size_t LZ4F_getFrameInfo(LZ4F_decompressionContext_t ctx, * or an error code which can be tested using LZ4F_isError(). */ -size_t LZ4F_decompress(LZ4F_decompressionContext_t ctx, +size_t LZ4F_decompress(LZ4F_decompressionContext_t dctx, void* dstBuffer, size_t* dstSizePtr, const void* srcBuffer, size_t* srcSizePtr, - const LZ4F_decompressOptions_t* optionsPtr); + const LZ4F_decompressOptions_t* dOptPtr); /* LZ4F_decompress() * Call this function repetitively to regenerate data compressed within srcBuffer. * The function will attempt to decode *srcSizePtr bytes from srcBuffer, into dstBuffer of maximum size *dstSizePtr. @@ -243,12 +244,13 @@ size_t LZ4F_decompress(LZ4F_decompressionContext_t ctx, * Schematically, it's the size of the current (or remaining) compressed block + header of next block. * Respecting the hint provides some boost to performance, since it does skip intermediate buffers. * This is just a hint, you can always provide any srcSize you want. - * When a frame is fully decoded, the function result will be 0. (no more data expected) + * When a frame is fully decoded, the function result will be 0 (no more data expected). * If decompression failed, function result is an error code, which can be tested using LZ4F_isError(). + * + * After a frame is fully decoded, dctx can be used again to decompress another frame. */ - #if defined (__cplusplus) } #endif |