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Update LZ4 to v1.8.0
This commit is contained in:
Tino Reichardt
126
C/lz4/lz4hc.h
126
C/lz4/lz4hc.h
@@ -1,7 +1,7 @@
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/*
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LZ4 HC - High Compression Mode of LZ4
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Header File
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Copyright (C) 2011-2016, Yann Collet.
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Copyright (C) 2011-2017, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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@@ -58,8 +58,8 @@ extern "C" {
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* `dst` must be already allocated.
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* Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
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* Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
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* `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_MAX_CLEVEL will work.
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* Values >LZ4HC_MAX_CLEVEL behave the same as LZ4HC_MAX_CLEVEL.
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* `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_CLEVEL_MAX will work.
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* Values >LZ4HC_CLEVEL_MAX behave the same as LZ4HC_CLEVEL_MAX.
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* @return : the number of bytes written into 'dst'
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* or 0 if compression fails.
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*/
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@@ -113,25 +113,23 @@ LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, in
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Then, use LZ4_compress_HC_continue() to compress each successive block.
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Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
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'dst' buffer should be sized to handle worst case scenarios, using LZ4_compressBound(), to ensure operation success.
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'dst' buffer should be sized to handle worst case scenarios (see LZ4_compressBound()), to ensure operation success.
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Because in case of failure, the API does not guarantee context recovery, and context will have to be reset.
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If `dst` buffer budget cannot be >= LZ4_compressBound(), consider using LZ4_compress_HC_continue_destSize() instead.
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If, for any reason, previous data blocks can't be preserved unmodified in memory during next compression block,
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you must save it to a safer memory space, using LZ4_saveDictHC().
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If, for any reason, previous data block can't be preserved unmodified in memory for next compression block,
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you can save it to a more stable memory space, using LZ4_saveDictHC().
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Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer'.
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*/
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/*-******************************************
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* !!!!! STATIC LINKING ONLY !!!!!
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*******************************************/
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/*-*************************************
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* PRIVATE DEFINITIONS :
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* Do not use these definitions.
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* They are exposed to allow static allocation of `LZ4_streamHC_t`.
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* Using these definitions makes the code vulnerable to potential API break when upgrading LZ4
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**************************************/
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#define LZ4HC_DICTIONARY_LOGSIZE 17
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#define LZ4HC_DICTIONARY_LOGSIZE 17 /* because of btopt, hc would only need 16 */
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#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
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#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
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@@ -147,14 +145,14 @@ typedef struct
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{
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uint32_t hashTable[LZ4HC_HASHTABLESIZE];
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uint16_t chainTable[LZ4HC_MAXD];
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const uint8_t* end; /* next block here to continue on current prefix */
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const uint8_t* base; /* All index relative to this position */
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const uint8_t* dictBase; /* alternate base for extDict */
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uint8_t* inputBuffer; /* deprecated */
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uint32_t dictLimit; /* below that point, need extDict */
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uint32_t lowLimit; /* below that point, no more dict */
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uint32_t nextToUpdate; /* index from which to continue dictionary update */
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uint32_t searchNum; /* only for optimal parser */
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const uint8_t* end; /* next block here to continue on current prefix */
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const uint8_t* base; /* All index relative to this position */
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const uint8_t* dictBase; /* alternate base for extDict */
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uint8_t* inputBuffer; /* deprecated */
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uint32_t dictLimit; /* below that point, need extDict */
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uint32_t lowLimit; /* below that point, no more dict */
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uint32_t nextToUpdate; /* index from which to continue dictionary update */
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uint32_t searchNum; /* only for optimal parser */
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uint32_t compressionLevel;
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} LZ4HC_CCtx_internal;
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@@ -163,7 +161,7 @@ typedef struct
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typedef struct
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{
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unsigned int hashTable[LZ4HC_HASHTABLESIZE];
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unsigned short chainTable[LZ4HC_MAXD];
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unsigned short chainTable[LZ4HC_MAXD];
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const unsigned char* end; /* next block here to continue on current prefix */
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const unsigned char* base; /* All index relative to this position */
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const unsigned char* dictBase; /* alternate base for extDict */
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@@ -172,7 +170,7 @@ typedef struct
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unsigned int lowLimit; /* below that point, no more dict */
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unsigned int nextToUpdate; /* index from which to continue dictionary update */
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unsigned int searchNum; /* only for optimal parser */
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unsigned int compressionLevel;
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int compressionLevel;
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} LZ4HC_CCtx_internal;
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#endif
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@@ -200,25 +198,25 @@ union LZ4_streamHC_u {
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/* deprecated compression functions */
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/* these functions will trigger warning messages in future releases */
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LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC (const char* source, char* dest, int inputSize);
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LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
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LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
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LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
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LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
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LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC (const char* source, char* dest, int inputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
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/* Deprecated Streaming functions using older model; should no longer be used */
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LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
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LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
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LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
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LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
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LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
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LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
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#if defined (__cplusplus)
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@@ -226,3 +224,55 @@ LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(
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#endif
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#endif /* LZ4_HC_H_19834876238432 */
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/*-************************************************
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* !!!!! STATIC LINKING ONLY !!!!!
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* Following definitions are considered experimental.
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* They should not be linked from DLL,
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* as there is no guarantee of API stability yet.
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* Prototypes will be promoted to "stable" status
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* after successfull usage in real-life scenarios.
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*************************************************/
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#ifdef LZ4_HC_STATIC_LINKING_ONLY /* protection macro */
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#ifndef LZ4_HC_SLO_098092834
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#define LZ4_HC_SLO_098092834
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/*! LZ4_compress_HC_destSize() : v1.8.0 (experimental)
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* Will try to compress as much data from `src` as possible
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* that can fit into `targetDstSize` budget.
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* Result is provided in 2 parts :
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* @return : the number of bytes written into 'dst'
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* or 0 if compression fails.
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* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`
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*/
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int LZ4_compress_HC_destSize(void* LZ4HC_Data,
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const char* src, char* dst,
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int* srcSizePtr, int targetDstSize,
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int compressionLevel);
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/*! LZ4_compress_HC_continue_destSize() : v1.8.0 (experimental)
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* Similar as LZ4_compress_HC_continue(),
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* but will read a variable nb of bytes from `src`
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* to fit into `targetDstSize` budget.
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* Result is provided in 2 parts :
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* @return : the number of bytes written into 'dst'
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* or 0 if compression fails.
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* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`.
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* Important : due to limitations, this prototype only works well up to cLevel < LZ4HC_CLEVEL_OPT_MIN
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* beyond that level, compression performance will be much reduced due to internal incompatibilities
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*/
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int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
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const char* src, char* dst,
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int* srcSizePtr, int targetDstSize);
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/*! LZ4_setCompressionLevel() : v1.8.0 (experimental)
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* It's possible to change compression level after LZ4_resetStreamHC(), between 2 invocations of LZ4_compress_HC_continue*(),
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* but that requires to stay in the same mode (aka 1-10 or 11-12).
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* This function ensures this condition.
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*/
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void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
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#endif /* LZ4_HC_SLO_098092834 */
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#endif /* LZ4_HC_STATIC_LINKING_ONLY */
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