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Updated LZ4 to the latest version.

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This commit is contained in:
Alex Szpakowski
2015-05-29 18:01:02 -03:00
parent 457903a425
commit 8c3dd76327
5 changed files with 781 additions and 592 deletions
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src/libraries/lz4/lz4.c
+418 -269
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src/libraries/lz4/lz4.h
+140 -95
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@@ -1,7 +1,8 @@
/*
LZ4 - Fast LZ compression algorithm
Header File
Copyright (C) 2011-2014, Yann Collet.
Copyright (C) 2011-2015, 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
@@ -28,7 +29,7 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 source repository : http://code.google.com/p/lz4/
- LZ4 source repository : https://github.com/Cyan4973/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#pragma once
@@ -38,22 +39,22 @@ extern "C" {
#endif
/*
* lz4.h provides raw compression format functions, for optimal performance and integration into programs.
* If you need to generate data using an inter-operable format (respecting the framing specification),
* please use lz4frame.h instead.
* 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.
*/
/**************************************
Version
* Version
**************************************/
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 5 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE 0 /* 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);
/**************************************
Tuning parameter
* Tuning parameter
**************************************/
/*
* LZ4_MEMORY_USAGE :
@@ -66,77 +67,90 @@ int LZ4_versionNumber (void);
/**************************************
Simple Functions
* Simple Functions
**************************************/
int LZ4_compress (const char* source, char* dest, int sourceSize);
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() :
Compresses 'sourceSize' bytes from 'source' into 'dest'.
Destination buffer must be already allocated,
and must be sized to handle worst cases situations (input data not compressible)
Worst case size evaluation is provided by function LZ4_compressBound()
inputSize : Max supported value is LZ4_MAX_INPUT_SIZE
return : the number of bytes written in buffer dest
or 0 if the compression fails
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).
It also runs faster, so it's a recommended setting.
If the function cannot compress 'source' into a more limited 'dest' budget,
compression stops *immediately*, and the function result is zero.
As a consequence, 'dest' content is not valid.
This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
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
LZ4_decompress_safe() :
compressedSize : is obviously the source size
maxDecompressedSize : is the size of the destination buffer, which must be already allocated.
return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize)
If the destination buffer is not large enough, decoding will stop and output an error code (<0).
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)
If destination buffer is not large enough, decoding will stop and output an error code (<0).
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,
and never writes outside of output buffer, nor reads outside of input buffer.
It is also protected against malicious data packets.
This function is protected against buffer overflow exploits, including malicious data packets.
It never writes outside output buffer, nor reads outside input buffer.
*/
/**************************************
Advanced Functions
* Advanced Functions
**************************************/
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
#define LZ4_COMPRESSBOUND(isize) ((unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
#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 (output 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).
isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
return : maximum output size in a "worst case" scenario
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
inputSize : max supported value is LZ4_MAX_INPUT_SIZE
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 isize);
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.
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()
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);
/*
LZ4_compress_limitedOutput() :
Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
If it cannot achieve it, compression will stop, and result of the function will be zero.
This saves time and memory on detecting non-compressible (or barely compressible) data.
This function never writes outside of provided output buffer.
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
maxOutputSize : is the size of the destination buffer (which must be already allocated)
return : the number of bytes written in buffer 'dest'
or 0 if compression fails
*/
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
/*
LZ4_compress_withState() :
Same compression functions, but using an externally allocated memory space to store compression state.
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 then, provide it as 'void* state' to compression functions.
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_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_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'.
This function either compresses the entire 'source' content into 'dest' if it's large enough,
or fill 'dest' buffer completely with as much data as possible from 'source'.
*sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
New value is necessarily <= old value.
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);
/*
@@ -152,7 +166,6 @@ LZ4_decompress_fast() :
*/
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'
@@ -169,9 +182,8 @@ int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedS
/***********************************************
Streaming Compression Functions
* Streaming Compression Functions
***********************************************/
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
/*
@@ -187,7 +199,7 @@ typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
* LZ4_resetStream
* Use this function to init an allocated LZ4_stream_t structure
*/
void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
void LZ4_resetStream (LZ4_stream_t* streamPtr);
/*
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
@@ -196,7 +208,7 @@ void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
* They are more future proof, in case of a change of LZ4_stream_t size.
*/
LZ4_stream_t* LZ4_createStream(void);
int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr);
int LZ4_freeStream (LZ4_stream_t* streamPtr);
/*
* LZ4_loadDict
@@ -205,36 +217,31 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr);
* Loading a size of 0 is allowed.
* Return : dictionary size, in bytes (necessarily <= 64 KB)
*/
int LZ4_loadDict (LZ4_stream_t* LZ4_streamPtr, const char* dictionary, int dictSize);
int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
/*
* LZ4_compress_continue
* Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio
* Previous data blocks are assumed to still be present at their previous location.
* 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_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
/*
* LZ4_compress_limitedOutput_continue
* Same as before, but also specify a maximum target compressed size (maxOutputSize)
* If objective cannot be met, compression exits, and returns a zero.
*/
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
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 again LZ4_compress_continue()
* Return : dictionary size in bytes, or 0 if error
* Note : any dictSize > 64 KB will be interpreted as 64KB.
* 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* LZ4_streamPtr, char* safeBuffer, int dictSize);
int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
/************************************************
Streaming Decompression Functions
* Streaming Decompression Functions
************************************************/
#define LZ4_STREAMDECODESIZE_U64 4
@@ -265,8 +272,18 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
*_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)
If this condition is not possible, save the relevant part of decoded data into a safe buffer,
and indicate where is its new address using LZ4_setStreamDecode()
In the case of a ring buffers, decoding buffer must be either :
- Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
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.
maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
In which case, encoding and decoding buffers do not need to be synchronized,
and encoding ring buffer can have any size, including small ones ( < 64 KB).
- _At least_ 64 KB + 8 bytes + maxBlockSize.
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()
*/
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);
@@ -276,8 +293,8 @@ int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch
Advanced decoding functions :
*_usingDict() :
These decoding functions work the same as
a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
They are stand-alone and don't use nor update an LZ4_streamDecode_t structure.
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);
@@ -285,29 +302,57 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
/**************************************
Obsolete Functions
* Obsolete Functions
**************************************/
/*
Obsolete decompression functions
These function names are deprecated and should no longer be used.
They are only provided here for compatibility with older user 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 if you really need them.
It is highly recommended to stop using these functions and migrate to newer ones */
/* 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 */
/* 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);
/* 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.
- 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 */
void* LZ4_create (const char* inputBuffer);
int LZ4_sizeofStreamState(void);
int LZ4_resetStreamState(void* state, const char* inputBuffer);
char* LZ4_slideInputBuffer (void* state);
LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
/* Obsolete streaming decoding functions */
int LZ4_decompress_safe_withPrefix64k (const char* source, char* dest, int compressedSize, int maxOutputSize);
int LZ4_decompress_fast_withPrefix64k (const char* source, char* dest, int originalSize);
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_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
#if defined (__cplusplus)
src/libraries/lz4/lz4hc.c
+112 -133
View File
@@ -1,52 +1,53 @@
/*
LZ4 HC - High Compression Mode of LZ4
Copyright (C) 2011-2014, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
LZ4 HC - High Compression Mode of LZ4
Copyright (C) 2011-2015, Yann Collet.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
You can contact the author at :
- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
- LZ4 source repository : http://code.google.com/p/lz4/
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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
*/
/**************************************
Tuning Parameter
* Tuning Parameter
**************************************/
static const int LZ4HC_compressionLevel_default = 8;
static const int LZ4HC_compressionLevel_default = 9;
/**************************************
Includes
* Includes
**************************************/
#include "lz4hc.h"
/**************************************
Local Compiler Options
* Local Compiler Options
**************************************/
#if defined(__GNUC__)
# pragma GCC diagnostic ignored "-Wunused-function"
@@ -58,18 +59,18 @@ static const int LZ4HC_compressionLevel_default = 8;
/**************************************
Common LZ4 definition
* Common LZ4 definition
**************************************/
#define LZ4_COMMONDEFS_ONLY
#include "lz4.c"
/**************************************
Local Constants
* Local Constants
**************************************/
#define DICTIONARY_LOGSIZE 16
#define MAXD (1<<DICTIONARY_LOGSIZE)
#define MAXD_MASK ((U32)(MAXD - 1))
#define MAXD_MASK (MAXD - 1)
#define HASH_LOG (DICTIONARY_LOGSIZE-1)
#define HASHTABLESIZE (1 << HASH_LOG)
@@ -81,36 +82,36 @@ static const int g_maxCompressionLevel = 16;
/**************************************
Local Types
* Local Types
**************************************/
typedef struct
{
U32 hashTable[HASHTABLESIZE];
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 */
const BYTE* inputBuffer;/* deprecated */
BYTE* inputBuffer; /* deprecated */
U32 dictLimit; /* below that point, need extDict */
U32 lowLimit; /* below that point, no more dict */
U32 nextToUpdate;
U32 nextToUpdate; /* index from which to continue dictionary update */
U32 compressionLevel;
} LZ4HC_Data_Structure;
/**************************************
Local Macros
* Local Macros
**************************************/
#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
#define DELTANEXT(p) chainTable[(size_t)(p) & MAXD_MASK]
#define GETNEXT(p) ((p) - (size_t)DELTANEXT(p))
//#define DELTANEXTU16(p) chainTable[(p) & MAXD_MASK] /* flexible, MAXD dependent */
#define DELTANEXTU16(p) chainTable[(U16)(p)] /* faster */
static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
/**************************************
HC Compression
* HC Compression
**************************************/
static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
{
@@ -118,7 +119,6 @@ static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
hc4->nextToUpdate = 64 KB;
hc4->base = start - 64 KB;
hc4->inputBuffer = start;
hc4->end = start;
hc4->dictBase = start - 64 KB;
hc4->dictLimit = 64 KB;
@@ -140,7 +140,7 @@ FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
U32 h = LZ4HC_hashPtr(base+idx);
size_t delta = idx - HashTable[h];
if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
chainTable[idx & 0xFFFF] = (U16)delta;
DELTANEXTU16(idx) = (U16)delta;
HashTable[h] = idx;
idx++;
}
@@ -196,7 +196,7 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
if (mlt > ml) { ml = mlt; *matchpos = base + matchIndex; } /* virtual matchpos */
}
}
matchIndex -= chainTable[matchIndex & 0xFFFF];
matchIndex -= DELTANEXTU16(matchIndex);
}
return (int)ml;
@@ -205,9 +205,9 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
LZ4HC_Data_Structure* hc4,
const BYTE* ip,
const BYTE* iLowLimit,
const BYTE* iHighLimit,
const BYTE* const ip,
const BYTE* const iLowLimit,
const BYTE* const iHighLimit,
int longest,
const BYTE** matchpos,
const BYTE** startpos,
@@ -217,9 +217,9 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
U32* const HashTable = hc4->hashTable;
const BYTE* const base = hc4->base;
const U32 dictLimit = hc4->dictLimit;
const BYTE* const lowPrefixPtr = base + dictLimit;
const U32 lowLimit = (hc4->lowLimit + 64 KB > (U32)(ip-base)) ? hc4->lowLimit : (U32)(ip - base) - (64 KB - 1);
const BYTE* const dictBase = hc4->dictBase;
const BYTE* match;
U32 matchIndex;
int nbAttempts = maxNbAttempts;
int delta = (int)(ip-iLowLimit);
@@ -234,42 +234,46 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
nbAttempts--;
if (matchIndex >= dictLimit)
{
match = base + matchIndex;
if (*(iLowLimit + longest) == *(match - delta + longest))
if (LZ4_read32(match) == LZ4_read32(ip))
const BYTE* matchPtr = base + matchIndex;
if (*(iLowLimit + longest) == *(matchPtr - delta + longest))
if (LZ4_read32(matchPtr) == LZ4_read32(ip))
{
const BYTE* startt = ip;
const BYTE* tmpMatch = match;
const BYTE* const matchEnd = ip + MINMATCH + LZ4_count(ip+MINMATCH, match+MINMATCH, iHighLimit);
int mlt = MINMATCH + LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
int back = 0;
while ((startt>iLowLimit) && (tmpMatch > iLowLimit) && (startt[-1] == tmpMatch[-1])) {startt--; tmpMatch--;}
while ((ip+back>iLowLimit)
&& (matchPtr+back > lowPrefixPtr)
&& (ip[back-1] == matchPtr[back-1]))
back--;
if ((matchEnd-startt) > longest)
mlt -= back;
if (mlt > longest)
{
longest = (int)(matchEnd-startt);
*matchpos = tmpMatch;
*startpos = startt;
longest = (int)mlt;
*matchpos = matchPtr+back;
*startpos = ip+back;
}
}
}
else
{
match = dictBase + matchIndex;
if (LZ4_read32(match) == LZ4_read32(ip))
const BYTE* matchPtr = dictBase + matchIndex;
if (LZ4_read32(matchPtr) == LZ4_read32(ip))
{
size_t mlt;
int back=0;
const BYTE* vLimit = ip + (dictLimit - matchIndex);
if (vLimit > iHighLimit) vLimit = iHighLimit;
mlt = LZ4_count(ip+MINMATCH, match+MINMATCH, vLimit) + MINMATCH;
mlt = LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
if ((ip+mlt == vLimit) && (vLimit < iHighLimit))
mlt += LZ4_count(ip+mlt, base+dictLimit, iHighLimit);
while ((ip+back > iLowLimit) && (matchIndex+back > lowLimit) && (ip[back-1] == match[back-1])) back--;
while ((ip+back > iLowLimit) && (matchIndex+back > lowLimit) && (ip[back-1] == matchPtr[back-1])) back--;
mlt -= back;
if ((int)mlt > longest) { longest = (int)mlt; *matchpos = base + matchIndex + back; *startpos = ip+back; }
}
}
matchIndex -= chainTable[matchIndex & 0xFFFF];
matchIndex -= DELTANEXTU16(matchIndex);
}
return longest;
@@ -531,69 +535,38 @@ _Search3:
}
int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel)
{
LZ4HC_Data_Structure ctx;
LZ4HC_init(&ctx, (const BYTE*)source);
return LZ4HC_compress_generic (&ctx, source, dest, inputSize, 0, compressionLevel, noLimit);
}
int LZ4_compressHC(const char* source, char* dest, int inputSize) { return LZ4_compressHC2(source, dest, inputSize, 0); }
int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
{
LZ4HC_Data_Structure ctx;
LZ4HC_init(&ctx, (const BYTE*)source);
return LZ4HC_compress_generic (&ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
}
int LZ4_compressHC_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
{
return LZ4_compressHC2_limitedOutput(source, dest, inputSize, maxOutputSize, 0);
}
/*****************************
* Using external allocation
* ***************************/
int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); }
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel)
int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
{
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*)source);
return LZ4HC_compress_generic (state, source, dest, inputSize, 0, compressionLevel, noLimit);
LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)src);
if (maxDstSize < LZ4_compressBound(srcSize))
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
else
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
}
int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize)
{ return LZ4_compressHC2_withStateHC (state, source, dest, inputSize, 0); }
int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
int LZ4_compress_HC(const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
{
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*)source);
return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
LZ4HC_Data_Structure state;
return LZ4_compress_HC_extStateHC(&state, src, dst, srcSize, maxDstSize, compressionLevel);
}
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
{ return LZ4_compressHC2_limitedOutput_withStateHC (state, source, dest, inputSize, maxOutputSize, 0); }
/**************************************
* Streaming Functions
* ************************************/
* Streaming Functions
**************************************/
/* allocation */
LZ4_streamHC_t* LZ4_createStreamHC(void) { return (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t)); }
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }
/* initialization */
void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
{
LZ4_STATIC_ASSERT(sizeof(LZ4HC_Data_Structure) <= LZ4_STREAMHCSIZE); /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
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;
}
@@ -646,14 +619,15 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
}
/* 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) && ((BYTE*)source < dictEnd))
if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd))
{
if (sourceEnd > dictEnd) sourceEnd = dictEnd;
ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
@@ -664,14 +638,12 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
return LZ4HC_compress_generic (ctxPtr, source, dest, inputSize, maxOutputSize, ctxPtr->compressionLevel, limit);
}
int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize)
int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
{
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, 0, noLimit);
}
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
{
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
if (maxOutputSize < LZ4_compressBound(inputSize))
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
else
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
}
@@ -684,7 +656,7 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
if (dictSize > 64 KB) dictSize = 64 KB;
if (dictSize < 4) dictSize = 0;
if (dictSize > prefixSize) dictSize = prefixSize;
memcpy(safeBuffer, streamPtr->end - dictSize, dictSize);
memmove(safeBuffer, streamPtr->end - dictSize, dictSize);
{
U32 endIndex = (U32)(streamPtr->end - streamPtr->base);
streamPtr->end = (const BYTE*)safeBuffer + dictSize;
@@ -698,21 +670,39 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
/***********************************
* Deprecated Functions
***********************************/
* Deprecated Functions
***********************************/
/* 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); }
int LZ4_compressHC2_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, cLevel); }
int LZ4_compressHC_withStateHC (void* state, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, maxDstSize, 0); }
int LZ4_compressHC2_withStateHC (void* state, const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, maxDstSize, cLevel); }
int LZ4_compressHC_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, LZ4_compressBound(srcSize)); }
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, maxDstSize); }
/* Deprecated streaming functions */
/* These functions currently generate deprecation warnings */
int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer)
int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
{
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;
return 0;
}
void* LZ4_createHC (const char* inputBuffer)
void* LZ4_createHC (char* inputBuffer)
{
void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure));
LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
((LZ4HC_Data_Structure*)hc4)->inputBuffer = (BYTE*)inputBuffer;
return hc4;
}
@@ -722,17 +712,6 @@ int LZ4_freeHC (void* LZ4HC_Data)
return (0);
}
/*
int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize)
{
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, 0, noLimit);
}
int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize)
{
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, 0, limitedOutput);
}
*/
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);
src/libraries/lz4/lz4hc.h
+105 -90
View File
@@ -1,7 +1,7 @@
/*
LZ4 HC - High Compression Mode of LZ4
Header File
Copyright (C) 2011-2014, Yann Collet.
Copyright (C) 2011-2015, 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
@@ -28,8 +28,8 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
- LZ4 source repository : http://code.google.com/p/lz4/
- LZ4 source repository : https://github.com/Cyan4973/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#pragma once
@@ -38,135 +38,150 @@
extern "C" {
#endif
/*****************************
* Includes
*****************************/
#include <stddef.h> /* size_t */
int LZ4_compressHC (const char* source, char* dest, int inputSize);
/**************************************
* Block Compression
**************************************/
int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/*
LZ4_compressHC :
return : the number of bytes in compressed buffer dest
or 0 if compression fails.
note : destination buffer must be already allocated.
To avoid any problem, size it to handle worst cases situations (input data not compressible)
Worst case size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
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.
*/
int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
/*
LZ4_compress_limitedOutput() :
Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
If it cannot achieve it, compression will stop, and result of the function will be zero.
This function never writes outside of provided output buffer.
inputSize : Max supported value is 1 GB
maxOutputSize : is maximum allowed size into the destination buffer (which must be already allocated)
return : the number of output bytes written in buffer 'dest'
or 0 if compression fails.
*/
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);
/*
Same functions as above, but with programmable 'compressionLevel'.
Recommended values are between 4 and 9, although any value between 0 and 16 will work.
'compressionLevel'==0 means use default 'compressionLevel' value.
Values above 16 behave the same as 16.
Equivalent variants exist for all other compression functions below.
*/
/* Note :
Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
*/
/**************************************
Using an external allocation
**************************************/
int LZ4_sizeofStateHC(void);
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_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/*
These functions are provided should you prefer to allocate memory for compression tables with your own allocation methods.
To know how much memory must be allocated for the compression tables, use :
int LZ4_sizeofStateHC();
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();
Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0).
Allocated memory must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
The allocated memory can be provided to the compression functions using 'void* state' parameter.
LZ4_compress_withStateHC() and LZ4_compress_limitedOutput_withStateHC() are equivalent to previously described functions.
They just use the externally allocated memory for state instead of allocating their own (on stack, or on heap).
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.
*/
/**************************************
Experimental Streaming Functions
* Streaming Compression
**************************************/
#define LZ4_STREAMHCSIZE_U64 32774
#define LZ4_STREAMHCSIZE (LZ4_STREAMHCSIZE_U64 * sizeof(unsigned long long))
typedef struct { unsigned long long table[LZ4_STREAMHCSIZE_U64]; } LZ4_streamHC_t;
#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.
LZ4_streamHC_t
This structure allows static allocation of LZ4 HC streaming state.
State must then be initialized using LZ4_resetStreamHC() before first use.
Static allocation should only be used with statically linked library.
If you want to use LZ4 as a DLL, please use construction functions below, which are more future-proof.
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_streamHC_t* LZ4_createStreamHC(void);
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr);
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, please use these functions instead of direct struct allocation,
to avoid size mismatch between different versions.
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.
*/
void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize);
void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
int LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
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);
int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int maxDictSize);
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 each previous block will remain read-accessible while compressing next block.
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().
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).
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_compressHC_continue() or LZ4_compressHC_limitedOutput_continue() to compress each successive block.
They work like usual LZ4_compressHC() or LZ4_compressHC_limitedOutput(), but use previous memory blocks to improve compression.
Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
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.
If, for any reason, previous data block can't be preserved in memory during next compression block,
you must save it to a safer memory space,
using LZ4_saveDictHC().
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().
Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer'.
*/
/**************************************
* Deprecated Streaming Functions
* ************************************/
/* Note : these streaming functions follows the older model, and should no longer be used */
void* LZ4_createHC (const char* inputBuffer);
char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
int LZ4_freeHC (void* LZ4HC_Data);
* 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
int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
/* 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);
int LZ4_sizeofStreamStateHC(void);
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
/* Streaming functions following the 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_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
#if defined (__cplusplus)