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Update lz4

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git-svn-id: https://svn.eduke32.com/eduke32@6846 1a8010ca-5511-0410-912e-c29ae57300e0
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terminx 2018-04-23 06:35:11 +00:00
parent ef9845a947
commit b3aa64a026
2 changed files with 1247 additions and 697 deletions
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source/build/include/lz4.h
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@ -1,7 +1,7 @@
/* /*
* LZ4 - Fast LZ compression algorithm * LZ4 - Fast LZ compression algorithm
* Header File * Header File
* Copyright (C) 2011-2016, Yann Collet. * Copyright (C) 2011-2017, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@ -32,13 +32,13 @@
- LZ4 homepage : http://www.lz4.org - LZ4 homepage : http://www.lz4.org
- LZ4 source repository : https://github.com/lz4/lz4 - LZ4 source repository : https://github.com/lz4/lz4
*/ */
#ifndef LZ4_H_2983827168210
#define LZ4_H_2983827168210
#if defined (__cplusplus) #if defined (__cplusplus)
extern "C" { extern "C" {
#endif #endif
#ifndef LZ4_H_2983827168210
#define LZ4_H_2983827168210
/* --- Dependency --- */ /* --- Dependency --- */
#include <stddef.h> /* size_t */ #include <stddef.h> /* size_t */
@ -72,20 +72,28 @@ extern "C" {
/* /*
* LZ4_DLL_EXPORT : * LZ4_DLL_EXPORT :
* Enable exporting of functions when building a Windows DLL * Enable exporting of functions when building a Windows DLL
* LZ4LIB_VISIBILITY :
* Control library symbols visibility.
*/ */
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1) #ifndef LZ4LIB_VISIBILITY
# define LZ4LIB_API __declspec(dllexport) # if defined(__GNUC__) && (__GNUC__ >= 4)
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1) # define LZ4LIB_VISIBILITY __attribute__ ((visibility ("default")))
# define LZ4LIB_API __declspec(dllimport) /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
# else # else
# define LZ4LIB_API # define LZ4LIB_VISIBILITY
# endif
#endif
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
# define LZ4LIB_API __declspec(dllexport) LZ4LIB_VISIBILITY
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
# define LZ4LIB_API __declspec(dllimport) LZ4LIB_VISIBILITY /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
#else
# define LZ4LIB_API LZ4LIB_VISIBILITY
#endif #endif
/*------ Version ------*/
/*========== Version =========== */
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */ #define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */ #define LZ4_VERSION_MINOR 8 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE 5 /* for tweaks, bug-fixes, or development */ #define LZ4_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE) #define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
@ -94,8 +102,8 @@ extern "C" {
#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str) #define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION) #define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
LZ4LIB_API int LZ4_versionNumber (void); LZ4LIB_API int LZ4_versionNumber (void); /**< library version number; useful to check dll version */
LZ4LIB_API const char* LZ4_versionString (void); LZ4LIB_API const char* LZ4_versionString (void); /**< library version string; unseful to check dll version */
/*-************************************ /*-************************************
@ -105,40 +113,40 @@ LZ4LIB_API const char* LZ4_versionString (void);
* LZ4_MEMORY_USAGE : * LZ4_MEMORY_USAGE :
* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.) * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
* Increasing memory usage improves compression ratio * Increasing memory usage improves compression ratio
* Reduced memory usage can improve speed, due to cache effect * Reduced memory usage may improve speed, thanks to cache effect
* Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
*/ */
#ifndef LZ4_MEMORY_USAGE
# define LZ4_MEMORY_USAGE 14 # define LZ4_MEMORY_USAGE 14
#endif
/*-************************************ /*-************************************
* Simple Functions * Simple Functions
**************************************/ **************************************/
/*! LZ4_compress_default() : /*! LZ4_compress_default() :
Compresses 'sourceSize' bytes from buffer 'source' Compresses 'srcSize' bytes from buffer 'src'
into already allocated 'dest' buffer of size 'maxDestSize'. into already allocated 'dst' buffer of size 'dstCapacity'.
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize). Compression is guaranteed to succeed if 'dstCapacity' >= LZ4_compressBound(srcSize).
It also runs faster, so it's a recommended setting. It also runs faster, so it's a recommended setting.
If the function cannot compress 'source' into a more limited 'dest' budget, If the function cannot compress 'src' into a more limited 'dst' budget,
compression stops *immediately*, and the function result is zero. compression stops *immediately*, and the function result is zero.
As a consequence, 'dest' content is not valid. Note : as a consequence, 'dst' content is not valid.
This function never writes outside 'dest' buffer, nor read outside 'source' buffer. Note 2 : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE srcSize : max supported value is LZ4_MAX_INPUT_SIZE.
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated) dstCapacity : size of buffer 'dst' (which must be already allocated)
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize) return : the number of bytes written into buffer 'dst' (necessarily <= dstCapacity)
or 0 if compression fails */ or 0 if compression fails */
LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize); LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
/*! LZ4_decompress_safe() : /*! LZ4_decompress_safe() :
compressedSize : is the precise full size of the compressed block. compressedSize : is the exact complete size of the compressed block.
maxDecompressedSize : is the size of destination buffer, which must be already allocated. dstCapacity : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize) return : the number of bytes decompressed into destination buffer (necessarily <= dstCapacity)
If destination buffer is not large enough, decoding will stop and output an error code (<0). If destination buffer is not large enough, decoding will stop and output an error code (negative value).
If the source stream is detected malformed, the function will stop decoding and return a negative result. If the source stream is detected malformed, the function will stop decoding and return a negative result.
This function is protected against buffer overflow exploits, including malicious data packets. This function is protected against malicious data packets.
It never writes outside output buffer, nor reads outside input buffer.
*/ */
LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize); LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
/*-************************************ /*-************************************
@ -152,22 +160,22 @@ LZ4_compressBound() :
Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible) Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
This function is primarily useful for memory allocation purposes (destination buffer size). This function is primarily useful for memory allocation purposes (destination buffer size).
Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example). Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize) Note that LZ4_compress_default() compresses faster when dstCapacity is >= LZ4_compressBound(srcSize)
inputSize : max supported value is LZ4_MAX_INPUT_SIZE inputSize : max supported value is LZ4_MAX_INPUT_SIZE
return : maximum output size in a "worst case" scenario return : maximum output size in a "worst case" scenario
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE) or 0, if input size is incorrect (too large or negative)
*/ */
LZ4LIB_API int LZ4_compressBound(int inputSize); LZ4LIB_API int LZ4_compressBound(int inputSize);
/*! /*!
LZ4_compress_fast() : LZ4_compress_fast() :
Same as LZ4_compress_default(), but allows to select an "acceleration" factor. Same as LZ4_compress_default(), but allows selection of "acceleration" factor.
The larger the acceleration value, the faster the algorithm, but also the lesser the compression. The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed. It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
An acceleration value of "1" is the same as regular LZ4_compress_default() An acceleration value of "1" is the same as regular LZ4_compress_default()
Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1. Values <= 0 will be replaced by ACCELERATION_DEFAULT (currently == 1, see lz4.c).
*/ */
LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration); LZ4LIB_API int LZ4_compress_fast (const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*! /*!
@ -178,49 +186,51 @@ LZ4_compress_fast_extState() :
Then, provide it as 'void* state' to compression function. Then, provide it as 'void* state' to compression function.
*/ */
LZ4LIB_API int LZ4_sizeofState(void); LZ4LIB_API int LZ4_sizeofState(void);
LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration); LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*! /*!
LZ4_compress_destSize() : LZ4_compress_destSize() :
Reverse the logic, by compressing as much data as possible from 'source' buffer Reverse the logic : compresses as much data as possible from 'src' buffer
into already allocated buffer 'dest' of size 'targetDestSize'. into already allocated buffer 'dst' of size 'targetDestSize'.
This function either compresses the entire 'source' content into 'dest' if it's large enough, This function either compresses the entire 'src' content into 'dst' if it's large enough,
or fill 'dest' buffer completely with as much data as possible from 'source'. or fill 'dst' buffer completely with as much data as possible from 'src'.
*sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'. *srcSizePtr : will be modified to indicate how many bytes where read from 'src' to fill 'dst'.
New value is necessarily <= old value. New value is necessarily <= old value.
return : Nb bytes written into 'dest' (necessarily <= targetDestSize) return : Nb bytes written into 'dst' (necessarily <= targetDestSize)
or 0 if compression fails or 0 if compression fails
*/ */
LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize); LZ4LIB_API int LZ4_compress_destSize (const char* src, char* dst, int* srcSizePtr, int targetDstSize);
/*! /*!
LZ4_decompress_fast() : LZ4_decompress_fast() : **unsafe!**
originalSize : is the original and therefore uncompressed size This function is a bit faster than LZ4_decompress_safe(),
return : the number of bytes read from the source buffer (in other words, the compressed size) but doesn't provide any security guarantee.
If the source stream is detected malformed, the function will stop decoding and return a negative result. originalSize : is the uncompressed size to regenerate
Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes. Destination buffer must be already allocated, and its size must be >= 'originalSize' bytes.
note : This function fully respect memory boundaries for properly formed compressed data. return : number of bytes read from source buffer (== compressed size).
It is a bit faster than LZ4_decompress_safe(). If the source stream is detected malformed, the function stops decoding and return a negative result.
However, it does not provide any protection against intentionally modified data stream (malicious input). note : This function respects memory boundaries for *properly formed* compressed data.
Use this function in trusted environment only (data to decode comes from a trusted source). However, it does not provide any protection against malicious input.
It also doesn't know 'src' size, and implies it's >= compressed size.
Use this function in trusted environment **only**.
*/ */
LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize); LZ4LIB_API int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
/*! /*!
LZ4_decompress_safe_partial() : LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source' This function decompress a compressed block of size 'srcSize' at position 'src'
into destination buffer 'dest' of size 'maxDecompressedSize'. into destination buffer 'dst' of size 'dstCapacity'.
The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached, The function will decompress a minimum of 'targetOutputSize' bytes, and stop after that.
reducing decompression time. However, it's not accurate, and may write more than 'targetOutputSize' (but always <= dstCapacity).
return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize) @return : the number of bytes decoded in the destination buffer (necessarily <= dstCapacity)
Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller. Note : this number can also be < targetOutputSize, if compressed block contains less data.
Always control how many bytes were decoded. Therefore, always control how many bytes were decoded.
If the source stream is detected malformed, the function will stop decoding and return a negative result. If source stream is detected malformed, function returns a negative result.
This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets This function is protected against malicious data packets.
*/ */
LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize); LZ4LIB_API int LZ4_decompress_safe_partial (const char* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);
/*-********************************************* /*-*********************************************
@ -237,35 +247,44 @@ LZ4LIB_API int LZ4_freeStream (LZ4_stream_t* streamPtr);
/*! LZ4_resetStream() : /*! LZ4_resetStream() :
* An LZ4_stream_t structure can be allocated once and re-used multiple times. * An LZ4_stream_t structure can be allocated once and re-used multiple times.
* Use this function to init an allocated `LZ4_stream_t` structure and start a new compression. * Use this function to start compressing a new stream.
*/ */
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr); LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
/*! LZ4_loadDict() : /*! LZ4_loadDict() :
* Use this function to load a static dictionary into LZ4_stream. * Use this function to load a static dictionary into LZ4_stream_t.
* Any previous data will be forgotten, only 'dictionary' will remain in memory. * Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed. * Loading a size of 0 is allowed, and is the same as reset.
* Return : dictionary size, in bytes (necessarily <= 64 KB) * @return : dictionary size, in bytes (necessarily <= 64 KB)
*/ */
LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize); LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
/*! LZ4_compress_fast_continue() : /*! LZ4_compress_fast_continue() :
* Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio. * Compress 'src' content using data from previously compressed blocks, for better compression ratio.
* Important : Previous data blocks are assumed to still be present and unmodified !
* 'dst' buffer must be already allocated. * 'dst' buffer must be already allocated.
* If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster. * If dstCapacity >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
* If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero. *
* Important : The previous 64KB of compressed data is assumed to remain present and unmodified in memory!
*
* Special 1 : When input is a double-buffer, they can have any size, including < 64 KB.
* Make sure that buffers are separated by at least one byte.
* This way, each block only depends on previous block.
* Special 2 : If input buffer is a ring-buffer, it can have any size, including < 64 KB.
*
* @return : size of compressed block
* or 0 if there is an error (typically, cannot fit into 'dst').
* After an error, the stream status is invalid, it can only be reset or freed.
*/ */
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration); LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*! LZ4_saveDict() : /*! LZ4_saveDict() :
* If previously compressed data block is not guaranteed to remain available at its memory location, * If last 64KB data cannot be guaranteed to remain available at its current memory location,
* save it into a safer place (char* safeBuffer). * save it into a safer place (char* safeBuffer).
* Note : you don't need to call LZ4_loadDict() afterwards, * This is schematically equivalent to a memcpy() followed by LZ4_loadDict(),
* dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue(). * but is much faster, because LZ4_saveDict() doesn't need to rebuild tables.
* Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error. * @return : saved dictionary size in bytes (necessarily <= maxDictSize), or 0 if error.
*/ */
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize); LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
/*-********************************************** /*-**********************************************
@ -274,36 +293,42 @@ LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dict
************************************************/ ************************************************/
typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* incomplete type (defined later) */ typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* incomplete type (defined later) */
/* creation / destruction of streaming decompression tracking structure */ /*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
* creation / destruction of streaming decompression tracking structure.
* A tracking structure can be re-used multiple times sequentially. */
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void); LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream); LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
/*! LZ4_setStreamDecode() : /*! LZ4_setStreamDecode() :
* Use this function to instruct where to find the dictionary. * An LZ4_streamDecode_t structure can be allocated once and re-used multiple times.
* Setting a size of 0 is allowed (same effect as reset). * Use this function to start decompression of a new stream of blocks.
* A dictionary can optionnally be set. Use NULL or size 0 for a reset order.
* @return : 1 if OK, 0 if error * @return : 1 if OK, 0 if error
*/ */
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize); LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*! /*! LZ4_decompress_*_continue() :
LZ4_decompress_*_continue() : * These decoding functions allow decompression of consecutive blocks in "streaming" mode.
These decoding functions allow decompression of multiple blocks in "streaming" mode. * A block is an unsplittable entity, it must be presented entirely to a decompression function.
Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB) * Decompression functions only accept one block at a time.
In the case of a ring buffers, decoding buffer must be either : * The last 64KB of previously decoded data *must* remain available and unmodified at the memory position where they were decoded.
- Exactly same size as encoding buffer, with same update rule (block boundaries at same positions) * If less than 64KB of data has been decoded all the data must be present.
In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB). *
- Larger than encoding buffer, by a minimum of maxBlockSize more bytes. * Special : if application sets a ring buffer for decompression, it must respect one of the following conditions :
maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block. * - Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
In which case, encoding and decoding buffers do not need to be synchronized, * In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
and encoding ring buffer can have any size, including small ones ( < 64 KB). * - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
- _At least_ 64 KB + 8 bytes + maxBlockSize. * maxBlockSize is implementation dependent. It's the maximum size of any single block.
In which case, encoding and decoding buffers do not need to be synchronized, * In which case, encoding and decoding buffers do not need to be synchronized,
and encoding ring buffer can have any size, including larger than decoding buffer. * and encoding ring buffer can have any size, including small ones ( < 64 KB).
Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer, * - _At least_ 64 KB + 8 bytes + maxBlockSize.
and indicate where it is saved using LZ4_setStreamDecode() * In which case, encoding and decoding buffers do not need to be synchronized,
* and encoding ring buffer can have any size, including larger than decoding buffer.
* Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
* and indicate where it is saved using LZ4_setStreamDecode() before decompressing next block.
*/ */
LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize); LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int srcSize, int dstCapacity);
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize); LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
/*! LZ4_decompress_*_usingDict() : /*! LZ4_decompress_*_usingDict() :
@ -311,13 +336,87 @@ LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecod
* a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue() * a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
* They are stand-alone, and don't need an LZ4_streamDecode_t structure. * They are stand-alone, and don't need an LZ4_streamDecode_t structure.
*/ */
LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize); LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* src, char* dst, int srcSize, int dstCapcity, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize); LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
/*^********************************************** /*^**********************************************
* !!!!!! STATIC LINKING ONLY !!!!!! * !!!!!! STATIC LINKING ONLY !!!!!!
***********************************************/ ***********************************************/
/*-************************************
* Unstable declarations
**************************************
* Declarations in this section should be considered unstable.
* Use at your own peril, etc., etc.
* They may be removed in the future.
* Their signatures may change.
**************************************/
#ifdef LZ4_STATIC_LINKING_ONLY
/*! LZ4_resetStream_fast() :
* When an LZ4_stream_t is known to be in a internally coherent state,
* it can often be prepared for a new compression with almost no work, only
* sometimes falling back to the full, expensive reset that is always required
* when the stream is in an indeterminate state (i.e., the reset performed by
* LZ4_resetStream()).
*
* LZ4_streams are guaranteed to be in a valid state when:
* - returned from LZ4_createStream()
* - reset by LZ4_resetStream()
* - memset(stream, 0, sizeof(LZ4_stream_t))
* - the stream was in a valid state and was reset by LZ4_resetStream_fast()
* - the stream was in a valid state and was then used in any compression call
* that returned success
* - the stream was in an indeterminate state and was used in a compression
* call that fully reset the state (LZ4_compress_fast_extState()) and that
* returned success
*/
LZ4LIB_API void LZ4_resetStream_fast (LZ4_stream_t* streamPtr);
/*! LZ4_compress_fast_extState_fastReset() :
* A variant of LZ4_compress_fast_extState().
*
* Using this variant avoids an expensive initialization step. It is only safe
* to call if the state buffer is known to be correctly initialized already
* (see above comment on LZ4_resetStream_fast() for a definition of "correctly
* initialized"). From a high level, the difference is that this function
* initializes the provided state with a call to LZ4_resetStream_fast() while
* LZ4_compress_fast_extState() starts with a call to LZ4_resetStream().
*/
LZ4LIB_API int LZ4_compress_fast_extState_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*! LZ4_attach_dictionary() :
* This is an experimental API that allows for the efficient use of a
* static dictionary many times.
*
* Rather than re-loading the dictionary buffer into a working context before
* each compression, or copying a pre-loaded dictionary's LZ4_stream_t into a
* working LZ4_stream_t, this function introduces a no-copy setup mechanism,
* in which the working stream references the dictionary stream in-place.
*
* Several assumptions are made about the state of the dictionary stream.
* Currently, only streams which have been prepared by LZ4_loadDict() should
* be expected to work.
*
* Alternatively, the provided dictionary stream pointer may be NULL, in which
* case any existing dictionary stream is unset.
*
* If a dictionary is provided, it replaces any pre-existing stream history.
* The dictionary contents are the only history that can be referenced and
* logically immediately precede the data compressed in the first subsequent
* compression call.
*
* The dictionary will only remain attached to the working stream through the
* first compression call, at the end of which it is cleared. The dictionary
* stream (and source buffer) must remain in-place / accessible / unchanged
* through the completion of the first compression call on the stream.
*/
LZ4LIB_API void LZ4_attach_dictionary(LZ4_stream_t *working_stream, const LZ4_stream_t *dictionary_stream);
#endif
/*-************************************ /*-************************************
* Private definitions * Private definitions
************************************** **************************************
@ -332,14 +431,16 @@ LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, in
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) #if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h> #include <stdint.h>
typedef struct { typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
struct LZ4_stream_t_internal {
uint32_t hashTable[LZ4_HASH_SIZE_U32]; uint32_t hashTable[LZ4_HASH_SIZE_U32];
uint32_t currentOffset; uint32_t currentOffset;
uint32_t initCheck; uint16_t initCheck;
uint16_t tableType;
const uint8_t* dictionary; const uint8_t* dictionary;
uint8_t* bufferStart; /* obsolete, used for slideInputBuffer */ const LZ4_stream_t_internal* dictCtx;
uint32_t dictSize; uint32_t dictSize;
} LZ4_stream_t_internal; };
typedef struct { typedef struct {
const uint8_t* externalDict; const uint8_t* externalDict;
@ -350,14 +451,16 @@ typedef struct {
#else #else
typedef struct { typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
struct LZ4_stream_t_internal {
unsigned int hashTable[LZ4_HASH_SIZE_U32]; unsigned int hashTable[LZ4_HASH_SIZE_U32];
unsigned int currentOffset; unsigned int currentOffset;
unsigned int initCheck; unsigned short initCheck;
unsigned short tableType;
const unsigned char* dictionary; const unsigned char* dictionary;
unsigned char* bufferStart; /* obsolete, used for slideInputBuffer */ const LZ4_stream_t_internal* dictCtx;
unsigned int dictSize; unsigned int dictSize;
} LZ4_stream_t_internal; };
typedef struct { typedef struct {
const unsigned char* externalDict; const unsigned char* externalDict;
@ -374,7 +477,7 @@ typedef struct {
* init this structure before first use. * init this structure before first use.
* note : only use in association with static linking ! * note : only use in association with static linking !
* this definition is not API/ABI safe, * this definition is not API/ABI safe,
* and may change in a future version ! * it may change in a future version !
*/ */
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4) #define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long)) #define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
@ -400,11 +503,12 @@ union LZ4_streamDecode_u {
} ; /* previously typedef'd to LZ4_streamDecode_t */ } ; /* previously typedef'd to LZ4_streamDecode_t */
/*=************************************ /*-************************************
* Obsolete Functions * Obsolete Functions
**************************************/ **************************************/
/* Deprecation warnings */
/* Should these warnings be a problem, /*! Deprecation warnings
Should deprecation warnings be a problem,
it is generally possible to disable them, it is generally possible to disable them,
typically with -Wno-deprecated-declarations for gcc typically with -Wno-deprecated-declarations for gcc
or _CRT_SECURE_NO_WARNINGS in Visual. or _CRT_SECURE_NO_WARNINGS in Visual.
@ -428,36 +532,38 @@ union LZ4_streamDecode_u {
#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */ #endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
/* Obsolete compression functions */ /* Obsolete compression functions */
LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress (const char* source, char* dest, int sourceSize); LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress (const char* source, char* dest, int sourceSize);
LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize); LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize); LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize); LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize); LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize); LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
/* Obsolete decompression functions */ /* Obsolete decompression functions */
/* These function names are completely deprecated and must no longer be used. LZ4_DEPRECATED("use LZ4_decompress_fast() instead") LZ4LIB_API int LZ4_uncompress (const char* source, char* dest, int outputSize);
They are only provided in lz4.c for compatibility with older programs. LZ4_DEPRECATED("use LZ4_decompress_safe() instead") LZ4LIB_API int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
- LZ4_uncompress is the same as LZ4_decompress_fast
- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
These function prototypes are now disabled; uncomment them only if you really need them.
It is highly recommended to stop using these prototypes and migrate to maintained ones */
/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
/* Obsolete streaming functions; use new streaming interface whenever possible */ /* Obsolete streaming functions; degraded functionality; do not use!
LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer); *
LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void); * In order to perform streaming compression, these functions depended on data
LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer); * that is no longer tracked in the state. They have been preserved as well as
LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state); * possible: using them will still produce a correct output. However, they don't
* actually retain any history between compression calls. The compression ratio
* achieved will therefore be no better than compressing each chunk
* independently.
*/
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API void* LZ4_create (char* inputBuffer);
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API int LZ4_sizeofStreamState(void);
LZ4_DEPRECATED("Use LZ4_resetStream() instead") LZ4LIB_API int LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4_DEPRECATED("Use LZ4_saveDict() instead") LZ4LIB_API char* LZ4_slideInputBuffer (void* state);
/* Obsolete streaming decoding functions */ /* Obsolete streaming decoding functions */
LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize); LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") LZ4LIB_API int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize); LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") LZ4LIB_API int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
#endif /* LZ4_H_2983827168210 */
#if defined (__cplusplus) #if defined (__cplusplus)
} }
#endif #endif
#endif /* LZ4_H_2983827168210 */

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