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Update lz4 library to the latest stable version (1.7.5, 2016-11-28)

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kmeaw 2017-05-06 11:29:08 +03:00 committed by alexey-milovidov
parent 11ec4c627d
commit 6b9fbd2095
4 changed files with 957 additions and 879 deletions
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385
contrib/liblz4/include/lz4/lz4.h
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@ -1,7 +1,7 @@
/*
LZ4 - Fast LZ compression algorithm
Header File
Copyright (C) 2011-2015, Yann Collet.
* LZ4 - Fast LZ compression algorithm
* Header File
* Copyright (C) 2011-2016, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@ -29,34 +29,79 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 source repository : https://github.com/Cyan4973/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
- LZ4 homepage : http://www.lz4.org
- LZ4 source repository : https://github.com/lz4/lz4
*/
#pragma once
#ifndef LZ4_H_2983827168210
#define LZ4_H_2983827168210
#if defined (__cplusplus)
extern "C" {
#endif
/*
* lz4.h provides block compression functions, and gives full buffer control to programmer.
* If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
* and can let the library handle its own memory, please use lz4frame.h instead.
/* --- Dependency --- */
#include <stddef.h> /* size_t */
/**
Introduction
LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
The LZ4 compression library provides in-memory compression and decompression functions.
Compression can be done in:
- a single step (described as Simple Functions)
- a single step, reusing a context (described in Advanced Functions)
- unbounded multiple steps (described as Streaming compression)
lz4.h provides block compression functions. It gives full buffer control to user.
Decompressing an lz4-compressed block also requires metadata (such as compressed size).
Each application is free to encode such metadata in whichever way it wants.
An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
take care of encoding standard metadata alongside LZ4-compressed blocks.
If your application requires interoperability, it's recommended to use it.
A library is provided to take care of it, see lz4frame.h.
*/
/**************************************
* Version
**************************************/
/*^***************************************************************
* Export parameters
*****************************************************************/
/*
* LZ4_DLL_EXPORT :
* Enable exporting of functions when building a Windows DLL
*/
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
# define LZ4LIB_API __declspec(dllexport)
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
# 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
# define LZ4LIB_API
#endif
/*========== Version =========== */
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
int LZ4_versionNumber (void);
#define LZ4_VERSION_RELEASE 5 /* for tweaks, bug-fixes, or development */
/**************************************
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
#define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
#define LZ4_QUOTE(str) #str
#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
LZ4LIB_API int LZ4_versionNumber (void);
LZ4LIB_API const char* LZ4_versionString (void);
/*-************************************
* Tuning parameter
**************************************/
/*
/*!
* LZ4_MEMORY_USAGE :
* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
* Increasing memory usage improves compression ratio
@ -66,15 +111,10 @@ int LZ4_versionNumber (void);
#define LZ4_MEMORY_USAGE 14
/**************************************
/*-************************************
* Simple Functions
**************************************/
int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
/*
LZ4_compress_default() :
/*! LZ4_compress_default() :
Compresses 'sourceSize' bytes from buffer 'source'
into already allocated 'dest' buffer of size 'maxDestSize'.
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
@ -86,9 +126,10 @@ LZ4_compress_default() :
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
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);
LZ4_decompress_safe() :
/*! LZ4_decompress_safe() :
compressedSize : is the precise full size of the compressed block.
maxDecompressedSize : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
@ -97,15 +138,16 @@ LZ4_decompress_safe() :
This function is protected against buffer overflow exploits, including 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);
/**************************************
/*-************************************
* Advanced Functions
**************************************/
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
/*
/*!
LZ4_compressBound() :
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).
@ -115,9 +157,9 @@ LZ4_compressBound() :
return : maximum output size in a "worst case" scenario
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
*/
int LZ4_compressBound(int inputSize);
LZ4LIB_API int LZ4_compressBound(int inputSize);
/*
/*!
LZ4_compress_fast() :
Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
@ -125,21 +167,21 @@ LZ4_compress_fast() :
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.
*/
int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
/*
/*!
LZ4_compress_fast_extState() :
Same compression function, just using an externally allocated memory space to store compression state.
Use LZ4_sizeofState() to know how much memory must be allocated,
and allocate it on 8-bytes boundaries (using malloc() typically).
Then, provide it as 'void* state' to compression function.
*/
int LZ4_sizeofState(void);
int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
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);
/*
/*!
LZ4_compress_destSize() :
Reverse the logic, by compressing as much data as possible from 'source' buffer
into already allocated buffer 'dest' of size 'targetDestSize'.
@ -150,10 +192,10 @@ LZ4_compress_destSize() :
return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
or 0 if compression fails
*/
int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
/*
/*!
LZ4_decompress_fast() :
originalSize : is the original and therefore uncompressed size
return : the number of bytes read from the source buffer (in other words, the compressed size)
@ -164,9 +206,9 @@ LZ4_decompress_fast() :
However, it does not provide any protection against intentionally modified data stream (malicious input).
Use this function in trusted environment only (data to decode comes from a trusted source).
*/
int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
/*
/*!
LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source'
into destination buffer 'dest' of size 'maxDecompressedSize'.
@ -178,98 +220,73 @@ LZ4_decompress_safe_partial() :
If the source stream is detected malformed, the function will stop decoding and return 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
*/
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* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
/***********************************************
/*-*********************************************
* Streaming Compression Functions
***********************************************/
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
/*
* LZ4_stream_t
* information structure to track an LZ4 stream.
* important : init this structure content before first use !
* note : only allocated directly the structure if you are statically linking LZ4
* If you are using liblz4 as a DLL, please use below construction methods instead.
typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
/*! LZ4_createStream() and LZ4_freeStream() :
* LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
* LZ4_freeStream() releases its memory.
*/
typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
LZ4LIB_API int LZ4_freeStream (LZ4_stream_t* streamPtr);
/*
* LZ4_resetStream
* Use this function to init an allocated LZ4_stream_t structure
/*! LZ4_resetStream() :
* 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.
*/
void LZ4_resetStream (LZ4_stream_t* streamPtr);
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
/*
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
* LZ4_freeStream releases its memory.
* In the context of a DLL (liblz4), please use these methods rather than the static struct.
* They are more future proof, in case of a change of LZ4_stream_t size.
/*! LZ4_loadDict() :
* Use this function to load a static dictionary into LZ4_stream.
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed.
* Return : dictionary size, in bytes (necessarily <= 64 KB)
*/
LZ4_stream_t* LZ4_createStream(void);
int LZ4_freeStream (LZ4_stream_t* streamPtr);
LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
/*
* LZ4_loadDict
* Use this function to load a static dictionary into LZ4_stream.
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed.
* Return : dictionary size, in bytes (necessarily <= 64 KB)
/*! LZ4_compress_fast_continue() :
* Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
* Important : Previous data blocks are assumed to still be present and unmodified !
* 'dst' buffer must be already allocated.
* If maxDstSize >= 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.
*/
int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
/*
* LZ4_compress_fast_continue
* Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
* Important : Previous data blocks are assumed to still be present and unmodified !
* 'dst' buffer must be already allocated.
* If maxDstSize >= 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.
/*! LZ4_saveDict() :
* If previously compressed data block is not guaranteed to remain available at its memory location,
* save it into a safer place (char* safeBuffer).
* Note : you don't need to call LZ4_loadDict() afterwards,
* dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue().
* Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
*/
int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
/*
* LZ4_saveDict
* If previously compressed data block is not guaranteed to remain available at its memory location
* save it into a safer place (char* safeBuffer)
* Note : you don't need to call LZ4_loadDict() afterwards,
* dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue()
* Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error
*/
int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
/************************************************
/*-**********************************************
* Streaming Decompression Functions
* Bufferless synchronous API
************************************************/
typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* incomplete type (defined later) */
#define LZ4_STREAMDECODESIZE_U64 4
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
/*
* LZ4_streamDecode_t
* information structure to track an LZ4 stream.
* init this structure content using LZ4_setStreamDecode or memset() before first use !
*
* In the context of a DLL (liblz4) please prefer usage of construction methods below.
* They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
* LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
* LZ4_freeStreamDecode releases its memory.
/* creation / destruction of streaming decompression tracking structure */
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
/*! LZ4_setStreamDecode() :
* Use this function to instruct where to find the dictionary.
* Setting a size of 0 is allowed (same effect as reset).
* @return : 1 if OK, 0 if error
*/
LZ4_streamDecode_t* LZ4_createStreamDecode(void);
int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*
* LZ4_setStreamDecode
* Use this function to instruct where to find the dictionary.
* Setting a size of 0 is allowed (same effect as reset).
* Return : 1 if OK, 0 if error
*/
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*
*_continue() :
/*!
LZ4_decompress_*_continue() :
These decoding functions allow decompression of multiple blocks in "streaming" mode.
Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
In the case of a ring buffers, decoding buffer must be either :
@ -285,35 +302,120 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
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()
*/
int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
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_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
/*
Advanced decoding functions :
*_usingDict() :
These decoding functions work the same as
a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
*/
int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
/*! LZ4_decompress_*_usingDict() :
* These decoding functions work the same as
* a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
* 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_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
/*^**********************************************
* !!!!!! STATIC LINKING ONLY !!!!!!
***********************************************/
/*-************************************
* Private definitions
**************************************
* Do not use these definitions.
* They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
* Using these definitions will expose code to API and/or ABI break in future versions of the library.
**************************************/
#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
/**************************************
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h>
typedef struct {
uint32_t hashTable[LZ4_HASH_SIZE_U32];
uint32_t currentOffset;
uint32_t initCheck;
const uint8_t* dictionary;
uint8_t* bufferStart; /* obsolete, used for slideInputBuffer */
uint32_t dictSize;
} LZ4_stream_t_internal;
typedef struct {
const uint8_t* externalDict;
size_t extDictSize;
const uint8_t* prefixEnd;
size_t prefixSize;
} LZ4_streamDecode_t_internal;
#else
typedef struct {
unsigned int hashTable[LZ4_HASH_SIZE_U32];
unsigned int currentOffset;
unsigned int initCheck;
const unsigned char* dictionary;
unsigned char* bufferStart; /* obsolete, used for slideInputBuffer */
unsigned int dictSize;
} LZ4_stream_t_internal;
typedef struct {
const unsigned char* externalDict;
size_t extDictSize;
const unsigned char* prefixEnd;
size_t prefixSize;
} LZ4_streamDecode_t_internal;
#endif
/*!
* LZ4_stream_t :
* information structure to track an LZ4 stream.
* init this structure before first use.
* note : only use in association with static linking !
* this definition is not API/ABI safe,
* and may change in a future version !
*/
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
union LZ4_stream_u {
unsigned long long table[LZ4_STREAMSIZE_U64];
LZ4_stream_t_internal internal_donotuse;
} ; /* previously typedef'd to LZ4_stream_t */
/*!
* LZ4_streamDecode_t :
* information structure to track an LZ4 stream during decompression.
* init this structure using LZ4_setStreamDecode (or memset()) before first use
* note : only use in association with static linking !
* this definition is not API/ABI safe,
* and may change in a future version !
*/
#define LZ4_STREAMDECODESIZE_U64 4
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
union LZ4_streamDecode_u {
unsigned long long table[LZ4_STREAMDECODESIZE_U64];
LZ4_streamDecode_t_internal internal_donotuse;
} ; /* previously typedef'd to LZ4_streamDecode_t */
/*=************************************
* Obsolete Functions
**************************************/
/* Deprecate Warnings */
/* Should these warnings messages be a problem,
/* Deprecation warnings */
/* Should these warnings be a problem,
it is generally possible to disable them,
with -Wno-deprecated-declarations for gcc
or _CRT_SECURE_NO_WARNINGS in Visual for example.
You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
# define LZ4_DEPRECATE_WARNING_DEFBLOCK
typically with -Wno-deprecated-declarations for gcc
or _CRT_SECURE_NO_WARNINGS in Visual.
Otherwise, it's also possible to define LZ4_DISABLE_DEPRECATE_WARNINGS */
#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
# define LZ4_DEPRECATED(message) /* disable deprecation warnings */
#else
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
# define LZ4_DEPRECATED(message) [[deprecated(message)]]
# elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
# elif (LZ4_GCC_VERSION >= 301)
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
@ -323,20 +425,19 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
# define LZ4_DEPRECATED(message)
# endif
#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
/* Obsolete compression functions */
/* These functions are planned to start generate warnings by r131 approximately */
int LZ4_compress (const char* source, char* dest, int sourceSize);
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_default() instead") 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_fast_extState() instead") 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_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") int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
/* Obsolete decompression functions */
/* These function names are completely deprecated and must no longer be used.
They are only provided here for compatibility with older programs.
They are only provided in lz4.c for compatibility with older programs.
- 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.
@ -358,3 +459,5 @@ LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress
#if defined (__cplusplus)
}
#endif
#endif /* LZ4_H_2983827168210 */

255
contrib/liblz4/include/lz4/lz4hc.h
View File

@ -1,7 +1,7 @@
/*
LZ4 HC - High Compression Mode of LZ4
Header File
Copyright (C) 2011-2015, Yann Collet.
Copyright (C) 2011-2016, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
Redistribution and use in source and binary forms, with or without
@ -28,107 +28,92 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 source repository : https://github.com/Cyan4973/lz4
- LZ4 source repository : https://github.com/lz4/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#pragma once
#ifndef LZ4_HC_H_19834876238432
#define LZ4_HC_H_19834876238432
#if defined (__cplusplus)
extern "C" {
#endif
/*****************************
* Includes
*****************************/
#include <stddef.h> /* size_t */
/* --- Dependency --- */
/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
#include "lz4.h" /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
/**************************************
* Block Compression
**************************************/
int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/*
LZ4_compress_HC :
Destination buffer 'dst' must be already allocated.
Compression completion is guaranteed if 'dst' buffer is sized to handle worst circumstances (data not compressible)
Worst size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
srcSize : Max supported value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
compressionLevel : Recommended values are between 4 and 9, although any value between 0 and 16 will work.
0 means "use default value" (see lz4hc.c).
Values >16 behave the same as 16.
return : the number of bytes written into buffer 'dst'
or 0 if compression fails.
*/
/* --- Useful constants --- */
#define LZ4HC_CLEVEL_MIN 3
#define LZ4HC_CLEVEL_DEFAULT 9
#define LZ4HC_CLEVEL_OPT_MIN 11
#define LZ4HC_CLEVEL_MAX 12
/*-************************************
* Block Compression
**************************************/
/*! LZ4_compress_HC() :
* Compress data from `src` into `dst`, using the more powerful but slower "HC" algorithm.
* `dst` must be already allocated.
* Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
* Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
* `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_MAX_CLEVEL will work.
* Values >LZ4HC_MAX_CLEVEL behave the same as LZ4HC_MAX_CLEVEL.
* @return : the number of bytes written into 'dst'
* or 0 if compression fails.
*/
LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel);
/* Note :
Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
*/
* Decompression functions are provided within "lz4.h" (BSD license)
*/
int LZ4_sizeofStateHC(void);
int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/*
LZ4_compress_HC_extStateHC() :
Use this function if you prefer to manually allocate memory for compression tables.
To know how much memory must be allocated for the compression tables, use :
int LZ4_sizeofStateHC();
Allocated memory must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
The allocated memory can then be provided to the compression functions using 'void* state' parameter.
LZ4_compress_HC_extStateHC() is equivalent to previously described function.
It just uses externally allocated memory for stateHC.
*/
/*! LZ4_compress_HC_extStateHC() :
* Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
* `state` size is provided by LZ4_sizeofStateHC().
* Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
*/
LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
LZ4LIB_API int LZ4_sizeofStateHC(void);
/**************************************
* Streaming Compression
**************************************/
#define LZ4_STREAMHCSIZE 262192
#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
typedef struct { size_t table[LZ4_STREAMHCSIZE_SIZET]; } LZ4_streamHC_t;
/*
LZ4_streamHC_t
This structure allows static allocation of LZ4 HC streaming state.
State must then be initialized using LZ4_resetStreamHC() before first use.
/*-************************************
* Streaming Compression
* Bufferless synchronous API
**************************************/
typedef union LZ4_streamHC_u LZ4_streamHC_t; /* incomplete type (defined later) */
Static allocation should only be used in combination with static linking.
If you want to use LZ4 as a DLL, please use construction functions below, which are future-proof.
*/
/*! LZ4_createStreamHC() and LZ4_freeStreamHC() :
* These functions create and release memory for LZ4 HC streaming state.
* Newly created states are automatically initialized.
* Existing states can be re-used several times, using LZ4_resetStreamHC().
* These methods are API and ABI stable, they can be used in combination with a DLL.
*/
LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
LZ4LIB_API int LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
LZ4LIB_API void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
LZ4LIB_API int LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
LZ4_streamHC_t* LZ4_createStreamHC(void);
int LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
/*
These functions create and release memory for LZ4 HC streaming state.
Newly created states are already initialized.
Existing state space can be re-used anytime using LZ4_resetStreamHC().
If you use LZ4 as a DLL, use these functions instead of static structure allocation,
to avoid size mismatch between different versions.
*/
LZ4LIB_API int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
int LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
/*
These functions compress data in successive blocks of any size, using previous blocks as dictionary.
One key assumption is that previous blocks (up to 64 KB) remain read-accessible while compressing next blocks.
There is an exception for ring buffers, which can be smaller 64 KB.
Such case is automatically detected and correctly handled by LZ4_compress_HC_continue().
There is an exception for ring buffers, which can be smaller than 64 KB.
Ring buffers scenario is automatically detected and handled by LZ4_compress_HC_continue().
Before starting compression, state must be properly initialized, using LZ4_resetStreamHC().
A first "fictional block" can then be designated as initial dictionary, using LZ4_loadDictHC() (Optional).
Then, use LZ4_compress_HC_continue() to compress each successive block.
It works like LZ4_compress_HC(), but use previous memory blocks as dictionary to improve compression.
Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
As a reminder, size 'dst' buffer to handle worst cases, using LZ4_compressBound(), to ensure success of compression operation.
'dst' buffer should be sized to handle worst case scenarios, using LZ4_compressBound(), to ensure operation success.
If, for any reason, previous data blocks can't be preserved unmodified in memory during next compression block,
you must save it to a safer memory space, using LZ4_saveDictHC().
@ -136,50 +121,102 @@ int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSi
*/
/*-******************************************
* !!!!! STATIC LINKING ONLY !!!!!
*******************************************/
/**************************************
/*-*************************************
* PRIVATE DEFINITIONS :
* Do not use these definitions.
* They are exposed to allow static allocation of `LZ4_streamHC_t`.
* Using these definitions makes the code vulnerable to potential API break when upgrading LZ4
**************************************/
#define LZ4HC_DICTIONARY_LOGSIZE 17
#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
#define LZ4HC_HASH_LOG 15
#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG)
#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1)
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h>
typedef struct
{
uint32_t hashTable[LZ4HC_HASHTABLESIZE];
uint16_t chainTable[LZ4HC_MAXD];
const uint8_t* end; /* next block here to continue on current prefix */
const uint8_t* base; /* All index relative to this position */
const uint8_t* dictBase; /* alternate base for extDict */
uint8_t* inputBuffer; /* deprecated */
uint32_t dictLimit; /* below that point, need extDict */
uint32_t lowLimit; /* below that point, no more dict */
uint32_t nextToUpdate; /* index from which to continue dictionary update */
uint32_t searchNum; /* only for optimal parser */
uint32_t compressionLevel;
} LZ4HC_CCtx_internal;
#else
typedef struct
{
unsigned int hashTable[LZ4HC_HASHTABLESIZE];
unsigned short chainTable[LZ4HC_MAXD];
const unsigned char* end; /* next block here to continue on current prefix */
const unsigned char* base; /* All index relative to this position */
const unsigned char* dictBase; /* alternate base for extDict */
unsigned char* inputBuffer; /* deprecated */
unsigned int dictLimit; /* below that point, need extDict */
unsigned int lowLimit; /* below that point, no more dict */
unsigned int nextToUpdate; /* index from which to continue dictionary update */
unsigned int searchNum; /* only for optimal parser */
unsigned int compressionLevel;
} LZ4HC_CCtx_internal;
#endif
#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56) /* 393268 */
#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
union LZ4_streamHC_u {
size_t table[LZ4_STREAMHCSIZE_SIZET];
LZ4HC_CCtx_internal internal_donotuse;
}; /* previously typedef'd to LZ4_streamHC_t */
/*
LZ4_streamHC_t :
This structure allows static allocation of LZ4 HC streaming state.
State must be initialized using LZ4_resetStreamHC() before first use.
Static allocation shall only be used in combination with static linking.
When invoking LZ4 from a DLL, use create/free functions instead, which are API and ABI stable.
*/
/*-************************************
* Deprecated Functions
**************************************/
/* Deprecate Warnings */
/* Should these warnings messages be a problem,
it is generally possible to disable them,
with -Wno-deprecated-declarations for gcc
or _CRT_SECURE_NO_WARNINGS in Visual for example.
You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
# define LZ4_DEPRECATE_WARNING_DEFBLOCK
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
# elif (LZ4_GCC_VERSION >= 301)
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
# elif defined(_MSC_VER)
# define LZ4_DEPRECATED(message) __declspec(deprecated(message))
# else
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
# define LZ4_DEPRECATED(message)
# endif
#endif // LZ4_DEPRECATE_WARNING_DEFBLOCK
/* see lz4.h LZ4_DISABLE_DEPRECATE_WARNINGS to turn off deprecation warnings */
/* compression functions */
/* these functions are planned to trigger warning messages by r131 approximately */
int LZ4_compressHC (const char* source, char* dest, int inputSize);
int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
/* deprecated compression functions */
/* these functions will trigger warning messages in future releases */
LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC (const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
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);
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
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);
/* Streaming functions following the older model; should no longer be used */
/* Deprecated Streaming functions using older model; should no longer be used */
LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
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);
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
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);
LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
@ -187,3 +224,5 @@ LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(
#if defined (__cplusplus)
}
#endif
#endif /* LZ4_HC_H_19834876238432 */

815
contrib/liblz4/src/lz4.c
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File diff suppressed because it is too large Load Diff

381
contrib/liblz4/src/lz4hc.c
View File

@ -1,6 +1,6 @@
/*
LZ4 HC - High Compression Mode of LZ4
Copyright (C) 2011-2015, Yann Collet.
Copyright (C) 2011-2016, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@ -28,27 +28,36 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 source repository : https://github.com/Cyan4973/lz4
- LZ4 source repository : https://github.com/lz4/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
/**************************************
/* *************************************
* Tuning Parameter
**************************************/
static const int LZ4HC_compressionLevel_default = 9;
***************************************/
/*!
* HEAPMODE :
* Select how default compression function will allocate workplace memory,
* in stack (0:fastest), or in heap (1:requires malloc()).
* Since workplace is rather large, heap mode is recommended.
*/
#ifndef LZ4HC_HEAPMODE
# define LZ4HC_HEAPMODE 1
#endif
/**************************************
* Includes
**************************************/
#include <lz4/lz4hc.h>
/* *************************************
* Dependency
***************************************/
#include "lz4hc.h"
/**************************************
/* *************************************
* Local Compiler Options
**************************************/
***************************************/
#if defined(__GNUC__)
# pragma GCC diagnostic ignored "-Wunused-function"
#endif
@ -58,52 +67,24 @@ static const int LZ4HC_compressionLevel_default = 9;
#endif
/**************************************
/* *************************************
* Common LZ4 definition
**************************************/
***************************************/
#define LZ4_COMMONDEFS_ONLY
#include "lz4.c"
/**************************************
/* *************************************
* Local Constants
**************************************/
#define DICTIONARY_LOGSIZE 16
#define MAXD (1<<DICTIONARY_LOGSIZE)
#define MAXD_MASK (MAXD - 1)
#define HASH_LOG (DICTIONARY_LOGSIZE-1)
#define HASHTABLESIZE (1 << HASH_LOG)
#define HASH_MASK (HASHTABLESIZE - 1)
***************************************/
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
static const int g_maxCompressionLevel = 16;
/**************************************
* Local Types
**************************************/
typedef struct
{
U32 hashTable[HASHTABLESIZE];
U16 chainTable[MAXD];
const BYTE* end; /* next block here to continue on current prefix */
const BYTE* base; /* All index relative to this position */
const BYTE* dictBase; /* alternate base for extDict */
BYTE* inputBuffer; /* deprecated */
U32 dictLimit; /* below that point, need extDict */
U32 lowLimit; /* below that point, no more dict */
U32 nextToUpdate; /* index from which to continue dictionary update */
U32 compressionLevel;
} LZ4HC_Data_Structure;
/**************************************
* Local Macros
**************************************/
#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
//#define DELTANEXTU16(p) chainTable[(p) & MAXD_MASK] /* flexible, MAXD dependent */
#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-LZ4HC_HASH_LOG))
#define DELTANEXTMAXD(p) chainTable[(p) & LZ4HC_MAXD_MASK] /* flexible, LZ4HC_MAXD dependent */
#define DELTANEXTU16(p) chainTable[(U16)(p)] /* faster */
static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
@ -113,7 +94,7 @@ static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)
/**************************************
* HC Compression
**************************************/
static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
static void LZ4HC_init (LZ4HC_CCtx_internal* hc4, const BYTE* start)
{
MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
@ -127,21 +108,20 @@ static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
/* Update chains up to ip (excluded) */
FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
{
U16* chainTable = hc4->chainTable;
U32* HashTable = hc4->hashTable;
U16* const chainTable = hc4->chainTable;
U32* const hashTable = hc4->hashTable;
const BYTE* const base = hc4->base;
const U32 target = (U32)(ip - base);
U32 const target = (U32)(ip - base);
U32 idx = hc4->nextToUpdate;
while(idx < target)
{
U32 h = LZ4HC_hashPtr(base+idx);
size_t delta = idx - HashTable[h];
while (idx < target) {
U32 const h = LZ4HC_hashPtr(base+idx);
size_t delta = idx - hashTable[h];
if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
DELTANEXTU16(idx) = (U16)delta;
HashTable[h] = idx;
hashTable[h] = idx;
idx++;
}
@ -149,7 +129,7 @@ FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
}
FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* Index table will be updated */
FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_CCtx_internal* hc4, /* Index table will be updated */
const BYTE* ip, const BYTE* const iLimit,
const BYTE** matchpos,
const int maxNbAttempts)
@ -161,7 +141,6 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
const U32 dictLimit = hc4->dictLimit;
const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1);
U32 matchIndex;
const BYTE* match;
int nbAttempts=maxNbAttempts;
size_t ml=0;
@ -169,24 +148,19 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
LZ4HC_Insert(hc4, ip);
matchIndex = HashTable[LZ4HC_hashPtr(ip)];
while ((matchIndex>=lowLimit) && (nbAttempts))
{
while ((matchIndex>=lowLimit) && (nbAttempts)) {
nbAttempts--;
if (matchIndex >= dictLimit)
{
match = base + matchIndex;
if (matchIndex >= dictLimit) {
const BYTE* const match = base + matchIndex;
if (*(match+ml) == *(ip+ml)
&& (LZ4_read32(match) == LZ4_read32(ip)))
{
size_t mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, iLimit) + MINMATCH;
size_t const mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, iLimit) + MINMATCH;
if (mlt > ml) { ml = mlt; *matchpos = match; }
}
}
else
{
match = dictBase + matchIndex;
if (LZ4_read32(match) == LZ4_read32(ip))
{
} else {
const BYTE* const match = dictBase + matchIndex;
if (LZ4_read32(match) == LZ4_read32(ip)) {
size_t mlt;
const BYTE* vLimit = ip + (dictLimit - matchIndex);
if (vLimit > iLimit) vLimit = iLimit;
@ -204,7 +178,7 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
LZ4HC_Data_Structure* hc4,
LZ4HC_CCtx_internal* hc4,
const BYTE* const ip,
const BYTE* const iLowLimit,
const BYTE* const iHighLimit,
@ -229,38 +203,32 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
LZ4HC_Insert(hc4, ip);
matchIndex = HashTable[LZ4HC_hashPtr(ip)];
while ((matchIndex>=lowLimit) && (nbAttempts))
{
while ((matchIndex>=lowLimit) && (nbAttempts)) {
nbAttempts--;
if (matchIndex >= dictLimit)
{
if (matchIndex >= dictLimit) {
const BYTE* matchPtr = base + matchIndex;
if (*(iLowLimit + longest) == *(matchPtr - delta + longest))
if (LZ4_read32(matchPtr) == LZ4_read32(ip))
{
if (*(iLowLimit + longest) == *(matchPtr - delta + longest)) {
if (LZ4_read32(matchPtr) == LZ4_read32(ip)) {
int mlt = MINMATCH + LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
int back = 0;
while ((ip+back>iLowLimit)
while ((ip+back > iLowLimit)
&& (matchPtr+back > lowPrefixPtr)
&& (ip[back-1] == matchPtr[back-1]))
back--;
mlt -= back;
if (mlt > longest)
{
if (mlt > longest) {
longest = (int)mlt;
*matchpos = matchPtr+back;
*startpos = ip+back;
}
}
}
else
{
const BYTE* matchPtr = dictBase + matchIndex;
if (LZ4_read32(matchPtr) == LZ4_read32(ip))
{
}
} else {
const BYTE* const matchPtr = dictBase + matchIndex;
if (LZ4_read32(matchPtr) == LZ4_read32(ip)) {
size_t mlt;
int back=0;
const BYTE* vLimit = ip + (dictLimit - matchIndex);
@ -320,8 +288,15 @@ FORCE_INLINE int LZ4HC_encodeSequence (
/* Encode MatchLength */
length = (int)(matchLength-MINMATCH);
if ((limitedOutputBuffer) && (*op + (length>>8) + (1 + LASTLITERALS) > oend)) return 1; /* Check output limit */
if (length>=(int)ML_MASK) { *token+=ML_MASK; length-=ML_MASK; for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (length > 254) { length-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)length; }
else *token += (BYTE)(length);
if (length>=(int)ML_MASK) {
*token += ML_MASK;
length -= ML_MASK;
for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; }
if (length > 254) { length-=255; *(*op)++ = 255; }
*(*op)++ = (BYTE)length;
} else {
*token += (BYTE)(length);
}
/* Prepare next loop */
*ip += matchLength;
@ -330,18 +305,18 @@ FORCE_INLINE int LZ4HC_encodeSequence (
return 0;
}
#include "lz4opt.h"
static int LZ4HC_compress_generic (
void* ctxvoid,
const char* source,
char* dest,
int inputSize,
int maxOutputSize,
int compressionLevel,
static int LZ4HC_compress_hashChain (
LZ4HC_CCtx_internal* const ctx,
const char* const source,
char* const dest,
int const inputSize,
int const maxOutputSize,
unsigned maxNbAttempts,
limitedOutput_directive limit
)
{
LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid;
const BYTE* ip = (const BYTE*) source;
const BYTE* anchor = ip;
const BYTE* const iend = ip + inputSize;
@ -351,28 +326,22 @@ static int LZ4HC_compress_generic (
BYTE* op = (BYTE*) dest;
BYTE* const oend = op + maxOutputSize;
unsigned maxNbAttempts;
int ml, ml2, ml3, ml0;
const BYTE* ref=NULL;
const BYTE* start2=NULL;
const BYTE* ref2=NULL;
const BYTE* start3=NULL;
const BYTE* ref3=NULL;
const BYTE* ref = NULL;
const BYTE* start2 = NULL;
const BYTE* ref2 = NULL;
const BYTE* start3 = NULL;
const BYTE* ref3 = NULL;
const BYTE* start0;
const BYTE* ref0;
/* init */
if (compressionLevel > g_maxCompressionLevel) compressionLevel = g_maxCompressionLevel;
if (compressionLevel < 1) compressionLevel = LZ4HC_compressionLevel_default;
maxNbAttempts = 1 << (compressionLevel-1);
ctx->end += inputSize;
ip++;
/* Main Loop */
while (ip < mflimit)
{
while (ip < mflimit) {
ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref), maxNbAttempts);
if (!ml) { ip++; continue; }
@ -383,19 +352,16 @@ static int LZ4HC_compress_generic (
_Search2:
if (ip+ml < mflimit)
ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2, maxNbAttempts);
ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 0, matchlimit, ml, &ref2, &start2, maxNbAttempts);
else ml2 = ml;
if (ml2 == ml) /* No better match */
{
if (ml2 == ml) { /* No better match */
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
continue;
}
if (start0 < ip)
{
if (start2 < ip + ml0) /* empirical */
{
if (start0 < ip) {
if (start2 < ip + ml0) { /* empirical */
ip = start0;
ref = ref0;
ml = ml0;
@ -403,8 +369,7 @@ _Search2:
}
/* Here, start0==ip */
if ((start2 - ip) < 3) /* First Match too small : removed */
{
if ((start2 - ip) < 3) { /* First Match too small : removed */
ml = ml2;
ip = start2;
ref =ref2;
@ -417,15 +382,13 @@ _Search3:
* ml2 > ml1, and
* ip1+3 <= ip2 (usually < ip1+ml1)
*/
if ((start2 - ip) < OPTIMAL_ML)
{
if ((start2 - ip) < OPTIMAL_ML) {
int correction;
int new_ml = ml;
if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML;
if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = (int)(start2 - ip) + ml2 - MINMATCH;
correction = new_ml - (int)(start2 - ip);
if (correction > 0)
{
if (correction > 0) {
start2 += correction;
ref2 += correction;
ml2 -= correction;
@ -437,8 +400,7 @@ _Search3:
ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts);
else ml3 = ml2;
if (ml3 == ml2) /* No better match : 2 sequences to encode */
{
if (ml3 == ml2) { /* No better match : 2 sequences to encode */
/* ip & ref are known; Now for ml */
if (start2 < ip+ml) ml = (int)(start2 - ip);
/* Now, encode 2 sequences */
@ -448,18 +410,14 @@ _Search3:
continue;
}
if (start3 < ip+ml+3) /* Not enough space for match 2 : remove it */
{
if (start3 >= (ip+ml)) /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
{
if (start2 < ip+ml)
{
if (start3 < ip+ml+3) { /* Not enough space for match 2 : remove it */
if (start3 >= (ip+ml)) { /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
if (start2 < ip+ml) {
int correction = (int)(ip+ml - start2);
start2 += correction;
ref2 += correction;
ml2 -= correction;
if (ml2 < MINMATCH)
{
if (ml2 < MINMATCH) {
start2 = start3;
ref2 = ref3;
ml2 = ml3;
@ -487,23 +445,18 @@ _Search3:
* OK, now we have 3 ascending matches; let's write at least the first one
* ip & ref are known; Now for ml
*/
if (start2 < ip+ml)
{
if ((start2 - ip) < (int)ML_MASK)
{
if (start2 < ip+ml) {
if ((start2 - ip) < (int)ML_MASK) {
int correction;
if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
correction = ml - (int)(start2 - ip);
if (correction > 0)
{
if (correction > 0) {
start2 += correction;
ref2 += correction;
ml2 -= correction;
}
}
else
{
} else {
ml = (int)(start2 - ip);
}
}
@ -521,8 +474,7 @@ _Search3:
}
/* Encode Last Literals */
{
int lastRun = (int)(iend - anchor);
{ int lastRun = (int)(iend - anchor);
if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; /* Check output limit */
if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
else *op++ = (BYTE)(lastRun<<ML_BITS);
@ -534,23 +486,64 @@ _Search3:
return (int) (((char*)op)-dest);
}
static int LZ4HC_getSearchNum(int compressionLevel)
{
switch (compressionLevel) {
default: return 0; /* unused */
case 11: return 128;
case 12: return 1<<10;
}
}
int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); }
static int LZ4HC_compress_generic (
LZ4HC_CCtx_internal* const ctx,
const char* const source,
char* const dest,
int const inputSize,
int const maxOutputSize,
int compressionLevel,
limitedOutput_directive limit
)
{
if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;
if (compressionLevel > 9) {
switch (compressionLevel) {
case 10: return LZ4HC_compress_hashChain(ctx, source, dest, inputSize, maxOutputSize, 1 << (16-1), limit);
case 11: ctx->searchNum = LZ4HC_getSearchNum(compressionLevel); return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, 128, 0);
default:
case 12: ctx->searchNum = LZ4HC_getSearchNum(compressionLevel); return LZ4HC_compress_optimal(ctx, source, dest, inputSize, maxOutputSize, limit, LZ4_OPT_NUM, 1);
}
}
return LZ4HC_compress_hashChain(ctx, source, dest, inputSize, maxOutputSize, 1 << (compressionLevel-1), limit);
}
int LZ4_sizeofStateHC(void) { return sizeof(LZ4_streamHC_t); }
int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
{
LZ4HC_CCtx_internal* ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)src);
LZ4HC_init (ctx, (const BYTE*)src);
if (maxDstSize < LZ4_compressBound(srcSize))
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
return LZ4HC_compress_generic (ctx, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
else
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
return LZ4HC_compress_generic (ctx, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
}
int LZ4_compress_HC(const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
{
LZ4HC_Data_Structure state;
return LZ4_compress_HC_extStateHC(&state, src, dst, srcSize, maxDstSize, compressionLevel);
#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
LZ4_streamHC_t* const statePtr = (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t));
#else
LZ4_streamHC_t state;
LZ4_streamHC_t* const statePtr = &state;
#endif
int const cSize = LZ4_compress_HC_extStateHC(statePtr, src, dst, srcSize, maxDstSize, compressionLevel);
#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
free(statePtr);
#endif
return cSize;
}
@ -566,32 +559,38 @@ int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_st
/* initialization */
void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
{
LZ4_STATIC_ASSERT(sizeof(LZ4HC_Data_Structure) <= sizeof(LZ4_streamHC_t)); /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->base = NULL;
((LZ4HC_Data_Structure*)LZ4_streamHCPtr)->compressionLevel = (unsigned)compressionLevel;
LZ4_STATIC_ASSERT(sizeof(LZ4HC_CCtx_internal) <= sizeof(size_t) * LZ4_STREAMHCSIZE_SIZET); /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
LZ4_streamHCPtr->internal_donotuse.base = NULL;
LZ4_streamHCPtr->internal_donotuse.compressionLevel = (unsigned)compressionLevel;
LZ4_streamHCPtr->internal_donotuse.searchNum = LZ4HC_getSearchNum(compressionLevel);
}
int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize)
{
LZ4HC_Data_Structure* ctxPtr = (LZ4HC_Data_Structure*) LZ4_streamHCPtr;
if (dictSize > 64 KB)
{
LZ4HC_CCtx_internal* ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
if (dictSize > 64 KB) {
dictionary += dictSize - 64 KB;
dictSize = 64 KB;
}
LZ4HC_init (ctxPtr, (const BYTE*)dictionary);
if (dictSize >= 4) LZ4HC_Insert (ctxPtr, (const BYTE*)dictionary +(dictSize-3));
ctxPtr->end = (const BYTE*)dictionary + dictSize;
if (ctxPtr->compressionLevel >= LZ4HC_CLEVEL_OPT_MIN)
LZ4HC_updateBinTree(ctxPtr, ctxPtr->end - MFLIMIT, ctxPtr->end - LASTLITERALS);
else
if (dictSize >= 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3);
return dictSize;
}
/* compression */
static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newBlock)
static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock)
{
if (ctxPtr->end >= ctxPtr->base + 4)
LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
if (ctxPtr->compressionLevel >= LZ4HC_CLEVEL_OPT_MIN)
LZ4HC_updateBinTree(ctxPtr, ctxPtr->end - MFLIMIT, ctxPtr->end - LASTLITERALS);
else
if (ctxPtr->end >= ctxPtr->base + 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
/* Only one memory segment for extDict, so any previous extDict is lost at this stage */
ctxPtr->lowLimit = ctxPtr->dictLimit;
ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base);
@ -601,34 +600,29 @@ static void LZ4HC_setExternalDict(LZ4HC_Data_Structure* ctxPtr, const BYTE* newB
ctxPtr->nextToUpdate = ctxPtr->dictLimit; /* match referencing will resume from there */
}
static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
static int LZ4_compressHC_continue_generic (LZ4_streamHC_t* LZ4_streamHCPtr,
const char* source, char* dest,
int inputSize, int maxOutputSize, limitedOutput_directive limit)
{
LZ4HC_CCtx_internal* ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
/* auto-init if forgotten */
if (ctxPtr->base == NULL)
LZ4HC_init (ctxPtr, (const BYTE*) source);
if (ctxPtr->base == NULL) LZ4HC_init (ctxPtr, (const BYTE*) source);
/* Check overflow */
if ((size_t)(ctxPtr->end - ctxPtr->base) > 2 GB)
{
if ((size_t)(ctxPtr->end - ctxPtr->base) > 2 GB) {
size_t dictSize = (size_t)(ctxPtr->end - ctxPtr->base) - ctxPtr->dictLimit;
if (dictSize > 64 KB) dictSize = 64 KB;
LZ4_loadDictHC((LZ4_streamHC_t*)ctxPtr, (const char*)(ctxPtr->end) - dictSize, (int)dictSize);
LZ4_loadDictHC(LZ4_streamHCPtr, (const char*)(ctxPtr->end) - dictSize, (int)dictSize);
}
/* Check if blocks follow each other */
if ((const BYTE*)source != ctxPtr->end)
LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
if ((const BYTE*)source != ctxPtr->end) LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
/* Check overlapping input/dictionary space */
{
const BYTE* sourceEnd = (const BYTE*) source + inputSize;
const BYTE* dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
const BYTE* dictEnd = ctxPtr->dictBase + ctxPtr->dictLimit;
if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd))
{
{ const BYTE* sourceEnd = (const BYTE*) source + inputSize;
const BYTE* const dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
const BYTE* const dictEnd = ctxPtr->dictBase + ctxPtr->dictLimit;
if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd)) {
if (sourceEnd > dictEnd) sourceEnd = dictEnd;
ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
if (ctxPtr->dictLimit - ctxPtr->lowLimit < 4) ctxPtr->lowLimit = ctxPtr->dictLimit;
@ -641,9 +635,9 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
{
if (maxOutputSize < LZ4_compressBound(inputSize))
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
else
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
}
@ -651,14 +645,13 @@ int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* sourc
int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictSize)
{
LZ4HC_Data_Structure* streamPtr = (LZ4HC_Data_Structure*)LZ4_streamHCPtr;
int prefixSize = (int)(streamPtr->end - (streamPtr->base + streamPtr->dictLimit));
LZ4HC_CCtx_internal* const streamPtr = &LZ4_streamHCPtr->internal_donotuse;
int const prefixSize = (int)(streamPtr->end - (streamPtr->base + streamPtr->dictLimit));
if (dictSize > 64 KB) dictSize = 64 KB;
if (dictSize < 4) dictSize = 0;
if (dictSize > prefixSize) dictSize = prefixSize;
memmove(safeBuffer, streamPtr->end - dictSize, dictSize);
{
U32 endIndex = (U32)(streamPtr->end - streamPtr->base);
{ U32 const endIndex = (U32)(streamPtr->end - streamPtr->base);
streamPtr->end = (const BYTE*)safeBuffer + dictSize;
streamPtr->base = streamPtr->end - endIndex;
streamPtr->dictLimit = endIndex - dictSize;
@ -672,8 +665,8 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
/***********************************
* Deprecated Functions
***********************************/
/* These functions currently generate deprecation warnings */
/* Deprecated compression functions */
/* These functions are planned to start generate warnings by r131 approximately */
int LZ4_compressHC(const char* src, char* dst, int srcSize) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
int LZ4_compressHC_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, 0); }
int LZ4_compressHC2(const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
@ -687,45 +680,41 @@ int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src,
/* Deprecated streaming functions */
/* These functions currently generate deprecation warnings */
int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
{
LZ4HC_CCtx_internal *ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1; /* Error : pointer is not aligned for pointer (32 or 64 bits) */
LZ4HC_init((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
((LZ4HC_Data_Structure*)state)->inputBuffer = (BYTE*)inputBuffer;
LZ4HC_init(ctx, (const BYTE*)inputBuffer);
ctx->inputBuffer = (BYTE*)inputBuffer;
return 0;
}
void* LZ4_createHC (char* inputBuffer)
{
void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure));
LZ4_streamHC_t* hc4 = (LZ4_streamHC_t*)ALLOCATOR(1, sizeof(LZ4_streamHC_t));
if (hc4 == NULL) return NULL; /* not enough memory */
LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
((LZ4HC_Data_Structure*)hc4)->inputBuffer = (BYTE*)inputBuffer;
LZ4HC_init (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
hc4->internal_donotuse.inputBuffer = (BYTE*)inputBuffer;
return hc4;
}
int LZ4_freeHC (void* LZ4HC_Data)
{
FREEMEM(LZ4HC_Data);
return (0);
}
int LZ4_freeHC (void* LZ4HC_Data) { FREEMEM(LZ4HC_Data); return 0; }
int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel)
{
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, compressionLevel, noLimit);
return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, source, dest, inputSize, 0, compressionLevel, noLimit);
}
int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
{
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
}
char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
{
LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
int dictSize = LZ4_saveDictHC((LZ4_streamHC_t*)LZ4HC_Data, (char*)(hc4->inputBuffer), 64 KB);
LZ4HC_CCtx_internal* const hc4 = &((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse;
int const dictSize = LZ4_saveDictHC((LZ4_streamHC_t*)LZ4HC_Data, (char*)(hc4->inputBuffer), 64 KB);
return (char*)(hc4->inputBuffer + dictSize);
}