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Upgrade LZ4.
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832
ext/lz4/lz4.c
832
ext/lz4/lz4.c
File diff suppressed because it is too large
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135
ext/lz4/lz4.h
135
ext/lz4/lz4.h
@ -37,12 +37,17 @@
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extern "C" {
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#endif
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/*
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* lz4.h provides raw compression format functions, for optimal performance and integration into programs.
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* If you need to generate data using an inter-operable format (respecting the framing specification),
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* please use lz4frame.h instead.
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*/
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/**************************************
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Version
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**************************************/
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#define LZ4_VERSION_MAJOR 1 /* for major interface/format changes */
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#define LZ4_VERSION_MINOR 3 /* for minor interface/format changes */
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#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
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#define LZ4_VERSION_MINOR 5 /* for new (non-breaking) interface capabilities */
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#define LZ4_VERSION_RELEASE 0 /* for tweaks, bug-fixes, or development */
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#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
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int LZ4_versionNumber (void);
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@ -64,12 +69,12 @@ int LZ4_versionNumber (void);
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Simple Functions
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**************************************/
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int LZ4_compress (const char* source, char* dest, int inputSize);
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int LZ4_compress (const char* source, char* dest, int sourceSize);
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int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
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/*
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LZ4_compress() :
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Compresses 'inputSize' bytes from 'source' into 'dest'.
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Compresses 'sourceSize' bytes from 'source' into 'dest'.
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Destination buffer must be already allocated,
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and must be sized to handle worst cases situations (input data not compressible)
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Worst case size evaluation is provided by function LZ4_compressBound()
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@ -83,16 +88,9 @@ LZ4_decompress_safe() :
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return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize)
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If the destination buffer is not large enough, decoding will stop and output an error code (<0).
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If the source stream is detected malformed, the function will stop decoding and return a negative result.
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This function is protected against buffer overflow exploits :
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it never writes outside of output buffer, and never reads outside of input buffer.
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Therefore, it is protected against malicious data packets.
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*/
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/*
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Note :
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Should you prefer to explicitly allocate compression-table memory using your own allocation method,
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use the streaming functions provided below, simply reset the memory area between each call to LZ4_compress_continue()
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This function is protected against buffer overflow exploits,
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and never writes outside of output buffer, nor reads outside of input buffer.
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It is also protected against malicious data packets.
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*/
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@ -104,9 +102,9 @@ Note :
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/*
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LZ4_compressBound() :
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Provides the maximum size that LZ4 may output in a "worst case" scenario (input data not compressible)
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primarily useful for memory allocation of output buffer.
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macro is also provided when result needs to be evaluated at compilation (such as stack memory allocation).
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Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
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This function is primarily useful for memory allocation purposes (output buffer size).
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Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
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isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
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return : maximum output size in a "worst case" scenario
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@ -117,16 +115,17 @@ int LZ4_compressBound(int isize);
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/*
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LZ4_compress_limitedOutput() :
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Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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This saves time and memory on detecting non-compressible (or barely compressible) data.
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This function never writes outside of provided output buffer.
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inputSize : Max supported value is LZ4_MAX_INPUT_VALUE
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sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
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maxOutputSize : is the size of the destination buffer (which must be already allocated)
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return : the number of bytes written in buffer 'dest'
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or 0 if the compression fails
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or 0 if compression fails
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*/
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int LZ4_compress_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
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int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
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/*
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@ -148,7 +147,7 @@ LZ4_decompress_fast() :
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Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes.
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note : This function fully respect memory boundaries for properly formed compressed data.
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It is a bit faster than LZ4_decompress_safe().
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However, it does not provide any protection against intentionnally modified data stream (malicious input).
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However, it does not provide any protection against intentionally modified data stream (malicious input).
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Use this function in trusted environment only (data to decode comes from a trusted source).
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*/
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int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
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@ -170,107 +169,106 @@ int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedS
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/***********************************************
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Experimental Streaming Compression Functions
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Streaming Compression Functions
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***********************************************/
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#define LZ4_STREAMSIZE_U32 ((1 << (LZ4_MEMORY_USAGE-2)) + 8)
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#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U32 * sizeof(unsigned int))
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#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
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#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
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/*
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* LZ4_stream_t
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* information structure to track an LZ4 stream.
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* important : init this structure content before first use !
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* note : only allocated directly the structure if you are statically linking LZ4
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* If you are using liblz4 as a DLL, please use below construction methods instead.
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*/
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typedef struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
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typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
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/*
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* LZ4_resetStream
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* Use this function to init a newly allocated LZ4_stream_t structure
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* You can also reset an existing LZ4_stream_t structure
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* Use this function to init an allocated LZ4_stream_t structure
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*/
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void LZ4_resetStream (LZ4_stream_t* LZ4_stream);
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void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
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/*
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* If you prefer dynamic allocation methods,
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* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
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* LZ4_freeStream releases its memory.
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* In the context of a DLL (liblz4), please use these methods rather than the static struct.
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* They are more future proof, in case of a change of LZ4_stream_t size.
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*/
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LZ4_stream_t* LZ4_createStream(void);
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int LZ4_freeStream (LZ4_stream_t* LZ4_stream);
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int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr);
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/*
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* LZ4_loadDict
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* Use this function to load a static dictionary into LZ4_stream.
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* Any previous data will be forgotten, only 'dictionary' will remain in memory.
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* Loading a size of 0 is allowed.
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* Return : 1 if OK, 0 if error
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* Return : dictionary size, in bytes (necessarily <= 64 KB)
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*/
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int LZ4_loadDict (LZ4_stream_t* LZ4_stream, const char* dictionary, int dictSize);
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int LZ4_loadDict (LZ4_stream_t* LZ4_streamPtr, const char* dictionary, int dictSize);
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/*
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* LZ4_compress_continue
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* Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio
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* Previous data blocks are assumed to still be present at their previous location.
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*/
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int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
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int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
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/*
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* LZ4_compress_limitedOutput_continue
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* Same as before, but also specify a maximum target compressed size (maxOutputSize)
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* If objective cannot be met, compression exits, and returns a zero.
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*/
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int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
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int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
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/*
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* LZ4_saveDict
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* If previously compressed data block is not guaranteed to remain available at its memory location
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* save it into a safe place (char* safeBuffer)
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* save it into a safer place (char* safeBuffer)
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* Note : you don't need to call LZ4_loadDict() afterwards,
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* dictionary is immediately usable, you can therefore call again LZ4_compress_continue()
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* Return : 1 if OK, 0 if error
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* Return : dictionary size in bytes, or 0 if error
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* Note : any dictSize > 64 KB will be interpreted as 64KB.
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*/
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int LZ4_saveDict (LZ4_stream_t* LZ4_stream, char* safeBuffer, int dictSize);
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int LZ4_saveDict (LZ4_stream_t* LZ4_streamPtr, char* safeBuffer, int dictSize);
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/************************************************
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Experimental Streaming Decompression Functions
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Streaming Decompression Functions
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************************************************/
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#define LZ4_STREAMDECODESIZE_U32 4
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#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
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#define LZ4_STREAMDECODESIZE_U64 4
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#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
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typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
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/*
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* LZ4_streamDecode_t
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* information structure to track an LZ4 stream.
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* important : init this structure content using LZ4_setStreamDecode or memset() before first use !
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*/
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typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
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/*
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* LZ4_setStreamDecode
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* Use this function to instruct where to find the dictionary.
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* This function can be used to specify a static dictionary,
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* or to instruct where to find some previously decoded data saved into a different memory space.
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* Setting a size of 0 is allowed (same effect as no dictionary).
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* Return : 1 if OK, 0 if error
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*/
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int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
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/*
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* If you prefer dynamic allocation methods,
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* init this structure content using LZ4_setStreamDecode or memset() before first use !
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*
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* In the context of a DLL (liblz4) please prefer usage of construction methods below.
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* They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
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* LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
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* LZ4_freeStreamDecode releases its memory.
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*/
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LZ4_streamDecode_t* LZ4_createStreamDecode(void);
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int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
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/*
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* LZ4_setStreamDecode
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* Use this function to instruct where to find the dictionary.
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* Setting a size of 0 is allowed (same effect as reset).
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* Return : 1 if OK, 0 if error
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*/
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int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
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/*
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*_continue() :
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These decoding functions allow decompression of multiple blocks in "streaming" mode.
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Previously decoded blocks must still be available at the memory position where they were decoded.
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If it's not possible, save the relevant part of decoded data into a safe buffer,
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and indicate where its new address using LZ4_setDictDecode()
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Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
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If this condition is not possible, save the relevant part of decoded data into a safe buffer,
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and indicate where is its new address using LZ4_setStreamDecode()
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*/
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int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize);
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int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
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int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
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@ -279,10 +277,9 @@ Advanced decoding functions :
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*_usingDict() :
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These decoding functions work the same as
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a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
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all together into a single function call.
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It doesn't use nor update an LZ4_streamDecode_t structure.
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They are stand-alone and don't use nor update an LZ4_streamDecode_t structure.
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*/
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int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize);
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int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
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int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
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@ -297,18 +294,10 @@ They are only provided here for compatibility with older user programs.
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- LZ4_uncompress is the same as LZ4_decompress_fast
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- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
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These function prototypes are now disabled; uncomment them if you really need them.
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It is highly recommended to stop using these functions and migrated to newer ones */
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It is highly recommended to stop using these functions and migrate to newer ones */
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/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
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/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
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/*
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* If you prefer dynamic allocation methods,
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* LZ4_createStreamDecode()
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* provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
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* LZ4_free just frees it.
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*/
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/* void* LZ4_createStreamDecode(void); */
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/*int LZ4_free (void* LZ4_stream); yes, it's the same one as for compression */
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/* Obsolete streaming functions; use new streaming interface whenever possible */
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void* LZ4_create (const char* inputBuffer);
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