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Update LZ4.

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This commit is contained in:
Alex Szpakowski
2017-12-17 21:52:19 -04:00
parent f69affebc9
commit cdcf052a73
8 changed files with 1829 additions and 1111 deletions
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CMakeLists.txt
+1
View File
@@ -1522,6 +1522,7 @@ set(LOVE_SRC_3P_LZ4
src/libraries/lz4/lz4.h
src/libraries/lz4/lz4hc.c
src/libraries/lz4/lz4hc.h
src/libraries/lz4/lz4opt.h
)
add_library(love_3p_lz4 ${LOVE_SRC_3P_LZ4})
platform/xcode/liblove.xcodeproj/project.pbxproj
+4
View File
@@ -1017,6 +1017,7 @@
FAC7CD911FE35E95006A60C7 /* physfs_archiver_grp.c in Sources */ = {isa = PBXBuildFile; fileRef = FAC7CD741FE35E95006A60C7 /* physfs_archiver_grp.c */; };
FAC7CD921FE35E95006A60C7 /* physfs_archiver_hog.c in Sources */ = {isa = PBXBuildFile; fileRef = FAC7CD751FE35E95006A60C7 /* physfs_archiver_hog.c */; };
FAC7CD931FE35E95006A60C7 /* physfs_archiver_zip.c in Sources */ = {isa = PBXBuildFile; fileRef = FAC7CD761FE35E95006A60C7 /* physfs_archiver_zip.c */; };
FAC7CD961FE755B4006A60C7 /* lz4opt.h in Headers */ = {isa = PBXBuildFile; fileRef = FAC7CD951FE755B3006A60C7 /* lz4opt.h */; };
FACA02EC1F5E396B0084B28F /* CompressedData.cpp in Sources */ = {isa = PBXBuildFile; fileRef = FACA02E01F5E396B0084B28F /* CompressedData.cpp */; };
FACA02ED1F5E396B0084B28F /* CompressedData.h in Headers */ = {isa = PBXBuildFile; fileRef = FACA02E11F5E396B0084B28F /* CompressedData.h */; };
FACA02EE1F5E396B0084B28F /* Compressor.cpp in Sources */ = {isa = PBXBuildFile; fileRef = FACA02E21F5E396B0084B28F /* Compressor.cpp */; };
@@ -1915,6 +1916,7 @@
FAC7CD741FE35E95006A60C7 /* physfs_archiver_grp.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = physfs_archiver_grp.c; sourceTree = "<group>"; };
FAC7CD751FE35E95006A60C7 /* physfs_archiver_hog.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = physfs_archiver_hog.c; sourceTree = "<group>"; };
FAC7CD761FE35E95006A60C7 /* physfs_archiver_zip.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = physfs_archiver_zip.c; sourceTree = "<group>"; };
FAC7CD951FE755B3006A60C7 /* lz4opt.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = lz4opt.h; sourceTree = "<group>"; };
FACA02E01F5E396B0084B28F /* CompressedData.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = CompressedData.cpp; sourceTree = "<group>"; };
FACA02E11F5E396B0084B28F /* CompressedData.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CompressedData.h; sourceTree = "<group>"; };
FACA02E21F5E396B0084B28F /* Compressor.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Compressor.cpp; sourceTree = "<group>"; };
@@ -3434,6 +3436,7 @@
FAB17BE51ABFAA9000F9BA27 /* lz4.h */,
FAB17BF31ABFC4B100F9BA27 /* lz4hc.c */,
FAB17BF41ABFC4B100F9BA27 /* lz4hc.h */,
FAC7CD951FE755B3006A60C7 /* lz4opt.h */,
);
path = lz4;
sourceTree = "<group>";
@@ -4025,6 +4028,7 @@
217DFBE01D9F6D490055D849 /* except.h in Headers */,
FA0B79311A958E3B000E1D17 /* Module.h in Headers */,
217DFBF51D9F6D490055D849 /* mime.lua.h in Headers */,
FAC7CD961FE755B4006A60C7 /* lz4opt.h in Headers */,
FA9D8DD31DEB56C3002CD881 /* pixelformat.h in Headers */,
FAF140A61E20934C00F898D2 /* ScanContext.h in Headers */,
FA0B7E4A1A95902C000E1D17 /* wrap_DistanceJoint.h in Headers */,
src/libraries/lz4/lz4.c
Regular → Executable
+520 -472
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File diff suppressed because it is too large Load Diff
src/libraries/lz4/lz4.h
Regular → Executable
+328 -209
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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) 2011-2017, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@@ -29,83 +29,134 @@
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
#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.
#ifndef LZ4_H_2983827168210
#define LZ4_H_2983827168210
/* --- 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
**************************************/
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#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);
/*^***************************************************************
* Export parameters
*****************************************************************/
/*
* LZ4_DLL_EXPORT :
* Enable exporting of functions when building a Windows DLL
* LZ4LIB_VISIBILITY :
* Control library symbols visibility.
*/
#ifndef LZ4LIB_VISIBILITY
# if defined(__GNUC__) && (__GNUC__ >= 4)
# define LZ4LIB_VISIBILITY __attribute__ ((visibility ("default")))
# else
# define LZ4LIB_VISIBILITY
# endif
#endif
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
# define LZ4LIB_API __declspec(dllexport) LZ4LIB_VISIBILITY
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
# define LZ4LIB_API __declspec(dllimport) LZ4LIB_VISIBILITY /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
#else
# define LZ4LIB_API LZ4LIB_VISIBILITY
#endif
/**************************************
/*------ Version ------*/
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 8 /* 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)
#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); /**< library version number; to be used when checking dll version */
LZ4LIB_API const char* LZ4_versionString (void); /**< library version string; to be used when checking dll version */
/*-************************************
* 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
* Reduced memory usage can improve speed, due to cache effect
* Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
*/
#define LZ4_MEMORY_USAGE 14
#ifndef LZ4_MEMORY_USAGE
# define LZ4_MEMORY_USAGE 14
#endif
/**************************************
/*-************************************
* 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() :
Compresses 'sourceSize' bytes from buffer 'source'
into already allocated 'dest' buffer of size 'maxDestSize'.
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
/*! LZ4_compress_default() :
Compresses 'srcSize' bytes from buffer 'src'
into already allocated 'dst' buffer of size 'dstCapacity'.
Compression is guaranteed to succeed if 'dstCapacity' >= LZ4_compressBound(srcSize).
It also runs faster, so it's a recommended setting.
If the function cannot compress 'source' into a more limited 'dest' budget,
If the function cannot compress 'src' into a limited 'dst' 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
As a consequence, 'dst' content is not valid.
This function never writes outside 'dst' buffer, nor read outside 'source' buffer.
srcSize : supported max value is LZ4_MAX_INPUT_VALUE
dstCapacity : full or partial size of buffer 'dst' (which must be already allocated)
return : the number of bytes written into buffer 'dst' (necessarily <= dstCapacity)
or 0 if compression fails */
LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
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)
If destination buffer is not large enough, decoding will stop and output an error code (<0).
/*! LZ4_decompress_safe() :
compressedSize : is the exact complete size of the compressed block.
dstCapacity : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= dstCapacity)
If destination buffer is not large enough, decoding will stop and output an error code (negative value).
If the source stream is detected malformed, the function will stop decoding and return a negative result.
This function is protected against buffer overflow exploits, including malicious data packets.
It never writes outside output buffer, nor reads outside input buffer.
*/
LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
/**************************************
/*-************************************
* 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 +166,9 @@ 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.
@@ -125,195 +176,268 @@ 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* src, char* dst, int srcSize, int dstCapacity, 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* src, char* dst, int srcSize, int dstCapacity, 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
Reverse the logic : compresses as much data as possible from 'src' buffer
into already allocated buffer 'dst' of size 'targetDestSize'.
This function either compresses the entire 'src' content into 'dst' if it's large enough,
or fill 'dst' buffer completely with as much data as possible from 'src'.
*srcSizePtr : will be modified to indicate how many bytes where read from 'src' to fill 'dst'.
New value is necessarily <= old value.
return : Nb bytes written into 'dst' (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* src, char* dst, int* srcSizePtr, int targetDstSize);
/*
LZ4_decompress_fast() :
originalSize : is the original and therefore uncompressed size
/*!
LZ4_decompress_fast() : (unsafe!!)
originalSize : is the original uncompressed size
return : the number of bytes read from the source buffer (in other words, the compressed size)
If the source stream is detected malformed, the function will stop decoding and return a negative result.
Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes.
note : This function fully respect memory boundaries for properly formed compressed data.
Destination buffer must be already allocated. Its size must be >= 'originalSize' bytes.
note : This function respects memory boundaries for *properly formed* compressed data.
It is a bit faster than LZ4_decompress_safe().
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* src, char* dst, 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'.
The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached,
reducing decompression time.
return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize)
Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
This function decompress a compressed block of size 'srcSize' at position 'src'
into destination buffer 'dst' of size 'dstCapacity'.
The function will decompress a minimum of 'targetOutputSize' bytes, and stop after that.
However, it's not accurate, and may write more than 'targetOutputSize' (but <= dstCapacity).
@return : the number of bytes decoded in the destination buffer (necessarily <= dstCapacity)
Note : this number can be < 'targetOutputSize' should the compressed block contain less data.
Always control how many bytes were decoded.
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
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* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);
/***********************************************
/*-*********************************************
* 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 start compressing a new stream.
*/
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_t.
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed, and is the same as reset.
* @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 content into 'src' using data from previously compressed blocks, improving compression ratio.
* 'dst' buffer must be already allocated.
* If dstCapacity >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
*
* Important : Up to 64KB of previously compressed data is assumed to remain present and unmodified in memory !
* Special 1 : If input buffer is a double-buffer, it can have any size, including < 64 KB.
* Special 2 : If input buffer is a ring-buffer, it can have any size, including < 64 KB.
*
* @return : size of compressed block
* or 0 if there is an error (typically, compressed data cannot fit into 'dst')
* After an error, the stream status is invalid, it can only be reset or freed.
*/
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 dstCapacity, 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 current memory location,
* save it into a safer place (char* safeBuffer).
* Note : it's not necessary to call LZ4_loadDict() after LZ4_saveDict(), dictionary is immediately usable.
* @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) */
/*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
* creation / destruction of streaming decompression tracking structure.
* A tracking structure can be re-used multiple times sequentially. */
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
/*! LZ4_setStreamDecode() :
* An LZ4_streamDecode_t structure can be allocated once and re-used multiple times.
* Use this function to start decompression of a new stream of blocks.
* A dictionary can optionnally be set. Use NULL or size 0 for a simple reset order.
* @return : 1 if OK, 0 if error
*/
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*! LZ4_decompress_*_continue() :
* These decoding functions allow decompression of consecutive blocks in "streaming" mode.
* A block is an unsplittable entity, it must be presented entirely to a decompression function.
* Decompression functions only accept one block at a time.
* Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB).
*
* Special : if application sets a ring buffer for decompression, it must respect one of the following conditions :
* - 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 of any 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() before decompressing next block.
*/
LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int srcSize, int dstCapacity);
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
/*! 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* src, char* dst, int srcSize, int dstCapcity, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
/*^**********************************************
* !!!!!! STATIC LINKING ONLY !!!!!!
***********************************************/
/*-************************************
* 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,
* it 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))
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.
*/
LZ4_streamDecode_t* LZ4_createStreamDecode(void);
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
*/
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*
*_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 :
- 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);
union LZ4_streamDecode_u {
unsigned long long table[LZ4_STREAMDECODESIZE_U64];
LZ4_streamDecode_t_internal internal_donotuse;
} ; /* previously typedef'd to LZ4_streamDecode_t */
/*
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);
/**************************************
/*-************************************
* Obsolete Functions
**************************************/
/* Deprecate Warnings */
/* Should these warnings messages be a problem,
/*! Deprecation warnings
Should deprecation 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(__clang__) /* clang doesn't handle mixed C++11 and CNU attributes */
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
# elif defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
# define LZ4_DEPRECATED(message) [[deprecated(message)]]
# elif (LZ4_GCC_VERSION >= 405)
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
# elif (LZ4_GCC_VERSION >= 301)
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
@@ -323,36 +447,31 @@ 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);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress (const char* source, char* dest, int sourceSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
LZ4LIB_API 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.
- 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); */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast() instead") int LZ4_uncompress (const char* source, char* dest, int outputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe() instead") int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
/* Obsolete streaming functions; use new streaming interface whenever possible */
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);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
/* Obsolete streaming decoding functions */
LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
#endif /* LZ4_H_2983827168210 */
#if defined (__cplusplus)
src/libraries/lz4/lz4hc.c
Regular → Executable
+448 -314
View File
File diff suppressed because it is too large Load Diff
src/libraries/lz4/lz4hc.h
Regular → Executable
+198 -115
View File
@@ -1,7 +1,7 @@
/*
LZ4 HC - High Compression Mode of LZ4
Header File
Copyright (C) 2011-2015, Yann Collet.
Copyright (C) 2011-2017, 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
@@ -28,162 +28,245 @@
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 requires lz4.h/lz4.c for 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` : any value between 1 and LZ4HC_CLEVEL_MAX will work.
* Values > LZ4HC_CLEVEL_MAX behave the same as LZ4HC_CLEVEL_MAX.
* @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() should do properly).
*/
LZ4LIB_API int LZ4_sizeofStateHC(void);
LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/**************************************
* 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 (see LZ4_compressBound()), to ensure operation success.
Because in case of failure, the API does not guarantee context recovery, and context will have to be reset.
If `dst` buffer budget cannot be >= LZ4_compressBound(), consider using LZ4_compress_HC_continue_destSize() instead.
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().
If, for any reason, previous data block can't be preserved unmodified in memory for next compression block,
you can save it to a more stable memory space, using LZ4_saveDictHC().
Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer'.
*/
/*-**************************************************************
* 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 16
#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 */
int 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 */
int compressionLevel;
} LZ4HC_CCtx_internal;
#endif
#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56) /* 262200 */
#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 */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC (const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
/* 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);
/* Deprecated Streaming functions using older model; should no longer be used */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
#if defined (__cplusplus)
}
#endif
#endif /* LZ4_HC_H_19834876238432 */
/*-**************************************************
* !!!!! STATIC LINKING ONLY !!!!!
* Following definitions are considered experimental.
* They should not be linked from DLL,
* as there is no guarantee of API stability yet.
* Prototypes will be promoted to "stable" status
* after successfull usage in real-life scenarios.
***************************************************/
#ifdef LZ4_HC_STATIC_LINKING_ONLY /* protection macro */
#ifndef LZ4_HC_SLO_098092834
#define LZ4_HC_SLO_098092834
/*! LZ4_compress_HC_destSize() : v1.8.0 (experimental)
* Will try to compress as much data from `src` as possible
* that can fit into `targetDstSize` budget.
* Result is provided in 2 parts :
* @return : the number of bytes written into 'dst'
* or 0 if compression fails.
* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`
*/
int LZ4_compress_HC_destSize(void* LZ4HC_Data,
const char* src, char* dst,
int* srcSizePtr, int targetDstSize,
int compressionLevel);
/*! LZ4_compress_HC_continue_destSize() : v1.8.0 (experimental)
* Similar as LZ4_compress_HC_continue(),
* but will read a variable nb of bytes from `src`
* to fit into `targetDstSize` budget.
* Result is provided in 2 parts :
* @return : the number of bytes written into 'dst'
* or 0 if compression fails.
* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`.
*/
int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
const char* src, char* dst,
int* srcSizePtr, int targetDstSize);
/*! LZ4_setCompressionLevel() : v1.8.0 (experimental)
* It's possible to change compression level between 2 invocations of LZ4_compress_HC_continue*()
*/
void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
#endif /* LZ4_HC_SLO_098092834 */
#endif /* LZ4_HC_STATIC_LINKING_ONLY */
src/libraries/lz4/lz4opt.h
Executable
+329
View File
@@ -0,0 +1,329 @@
/*
lz4opt.h - Optimal Mode of LZ4
Copyright (C) 2015-2017, Przemyslaw Skibinski <inikep@gmail.com>
Note : this file is intended to be included within lz4hc.c
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* 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.
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/lz4/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#define LZ4_OPT_NUM (1<<12)
typedef struct {
int price;
int off;
int mlen;
int litlen;
} LZ4HC_optimal_t;
/* price in bytes */
LZ4_FORCE_INLINE int LZ4HC_literalsPrice(int const litlen)
{
int price = litlen;
if (litlen >= (int)RUN_MASK)
price += 1 + (litlen-RUN_MASK)/255;
return price;
}
/* requires mlen >= MINMATCH */
LZ4_FORCE_INLINE int LZ4HC_sequencePrice(int litlen, int mlen)
{
int price = 1 + 2 ; /* token + 16-bit offset */
price += LZ4HC_literalsPrice(litlen);
if (mlen >= (int)(ML_MASK+MINMATCH))
price += 1 + (mlen-(ML_MASK+MINMATCH))/255;
return price;
}
/*-*************************************
* Match finder
***************************************/
typedef struct {
int off;
int len;
} LZ4HC_match_t;
LZ4_FORCE_INLINE
LZ4HC_match_t LZ4HC_FindLongerMatch(LZ4HC_CCtx_internal* const ctx,
const BYTE* ip, const BYTE* const iHighLimit,
int minLen, int nbSearches)
{
LZ4HC_match_t match = { 0 , 0 };
const BYTE* matchPtr = NULL;
/* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
* but this won't be the case here, as we define iLowLimit==ip,
* so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
int const matchLength = LZ4HC_InsertAndGetWiderMatch(ctx, ip, ip, iHighLimit, minLen, &matchPtr, &ip, nbSearches);
if (matchLength <= minLen) return match;
match.len = matchLength;
match.off = (int)(ip-matchPtr);
return match;
}
static int LZ4HC_compress_optimal (
LZ4HC_CCtx_internal* ctx,
const char* const source,
char* dst,
int inputSize,
int dstCapacity,
limitedOutput_directive limit,
int const nbSearches,
size_t sufficient_len,
int const fullUpdate
)
{
#define TRAILING_LITERALS 3
LZ4HC_optimal_t opt[LZ4_OPT_NUM + TRAILING_LITERALS]; /* this uses a bit too much stack memory to my taste ... */
const BYTE* ip = (const BYTE*) source;
const BYTE* anchor = ip;
const BYTE* const iend = ip + inputSize;
const BYTE* const mflimit = iend - MFLIMIT;
const BYTE* const matchlimit = iend - LASTLITERALS;
BYTE* op = (BYTE*) dst;
BYTE* const oend = op + dstCapacity;
/* init */
DEBUGLOG(5, "LZ4HC_compress_optimal");
if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
/* Main Loop */
assert(ip - anchor < LZ4_MAX_INPUT_SIZE);
while (ip < mflimit) {
int const llen = (int)(ip - anchor);
int best_mlen, best_off;
int cur, last_match_pos = 0;
LZ4HC_match_t const firstMatch = LZ4HC_FindLongerMatch(ctx, ip, matchlimit, MINMATCH-1, nbSearches);
if (firstMatch.len==0) { ip++; continue; }
if ((size_t)firstMatch.len > sufficient_len) {
/* good enough solution : immediate encoding */
int const firstML = firstMatch.len;
const BYTE* const matchPos = ip - firstMatch.off;
if ( LZ4HC_encodeSequence(&ip, &op, &anchor, firstML, matchPos, limit, oend) ) /* updates ip, op and anchor */
return 0; /* error */
continue;
}
/* set prices for first positions (literals) */
{ int rPos;
for (rPos = 0 ; rPos < MINMATCH ; rPos++) {
int const cost = LZ4HC_literalsPrice(llen + rPos);
opt[rPos].mlen = 1;
opt[rPos].off = 0;
opt[rPos].litlen = llen + rPos;
opt[rPos].price = cost;
DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
rPos, cost, opt[rPos].litlen);
} }
/* set prices using initial match */
{ int mlen = MINMATCH;
int const matchML = firstMatch.len; /* necessarily < sufficient_len < LZ4_OPT_NUM */
int const offset = firstMatch.off;
assert(matchML < LZ4_OPT_NUM);
for ( ; mlen <= matchML ; mlen++) {
int const cost = LZ4HC_sequencePrice(llen, mlen);
opt[mlen].mlen = mlen;
opt[mlen].off = offset;
opt[mlen].litlen = llen;
opt[mlen].price = cost;
DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i) -- initial setup",
mlen, cost, mlen);
} }
last_match_pos = firstMatch.len;
{ int addLit;
for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
opt[last_match_pos+addLit].mlen = 1; /* literal */
opt[last_match_pos+addLit].off = 0;
opt[last_match_pos+addLit].litlen = addLit;
opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
} }
/* check further positions */
for (cur = 1; cur < last_match_pos; cur++) {
const BYTE* const curPtr = ip + cur;
LZ4HC_match_t newMatch;
if (curPtr >= mflimit) break;
DEBUGLOG(7, "rPos:%u[%u] vs [%u]%u",
cur, opt[cur].price, opt[cur+1].price, cur+1);
if (fullUpdate) {
/* not useful to search here if next position has same (or lower) cost */
if ( (opt[cur+1].price <= opt[cur].price)
/* in some cases, next position has same cost, but cost rises sharply after, so a small match would still be beneficial */
&& (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/) )
continue;
} else {
/* not useful to search here if next position has same (or lower) cost */
if (opt[cur+1].price <= opt[cur].price) continue;
}
DEBUGLOG(7, "search at rPos:%u", cur);
if (fullUpdate)
newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, MINMATCH-1, nbSearches);
else
/* only test matches of minimum length; slightly faster, but misses a few bytes */
newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, last_match_pos - cur, nbSearches);
if (!newMatch.len) continue;
if ( ((size_t)newMatch.len > sufficient_len)
|| (newMatch.len + cur >= LZ4_OPT_NUM) ) {
/* immediate encoding */
best_mlen = newMatch.len;
best_off = newMatch.off;
last_match_pos = cur + 1;
goto encode;
}
/* before match : set price with literals at beginning */
{ int const baseLitlen = opt[cur].litlen;
int litlen;
for (litlen = 1; litlen < MINMATCH; litlen++) {
int const price = opt[cur].price - LZ4HC_literalsPrice(baseLitlen) + LZ4HC_literalsPrice(baseLitlen+litlen);
int const pos = cur + litlen;
if (price < opt[pos].price) {
opt[pos].mlen = 1; /* literal */
opt[pos].off = 0;
opt[pos].litlen = baseLitlen+litlen;
opt[pos].price = price;
DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)",
pos, price, opt[pos].litlen);
} } }
/* set prices using match at position = cur */
{ int const matchML = newMatch.len;
int ml = MINMATCH;
assert(cur + newMatch.len < LZ4_OPT_NUM);
for ( ; ml <= matchML ; ml++) {
int const pos = cur + ml;
int const offset = newMatch.off;
int price;
int ll;
DEBUGLOG(7, "testing price rPos %i (last_match_pos=%i)",
pos, last_match_pos);
if (opt[cur].mlen == 1) {
ll = opt[cur].litlen;
price = ((cur > ll) ? opt[cur - ll].price : 0)
+ LZ4HC_sequencePrice(ll, ml);
} else {
ll = 0;
price = opt[cur].price + LZ4HC_sequencePrice(0, ml);
}
if (pos > last_match_pos+TRAILING_LITERALS || price <= opt[pos].price) {
DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i)",
pos, price, ml);
assert(pos < LZ4_OPT_NUM);
if ( (ml == matchML) /* last pos of last match */
&& (last_match_pos < pos) )
last_match_pos = pos;
opt[pos].mlen = ml;
opt[pos].off = offset;
opt[pos].litlen = ll;
opt[pos].price = price;
} } }
/* complete following positions with literals */
{ int addLit;
for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
opt[last_match_pos+addLit].mlen = 1; /* literal */
opt[last_match_pos+addLit].off = 0;
opt[last_match_pos+addLit].litlen = addLit;
opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)", last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
} }
} /* for (cur = 1; cur <= last_match_pos; cur++) */
best_mlen = opt[last_match_pos].mlen;
best_off = opt[last_match_pos].off;
cur = last_match_pos - best_mlen;
encode: /* cur, last_match_pos, best_mlen, best_off must be set */
assert(cur < LZ4_OPT_NUM);
assert(last_match_pos >= 1); /* == 1 when only one candidate */
DEBUGLOG(6, "reverse traversal, looking for shortest path")
DEBUGLOG(6, "last_match_pos = %i", last_match_pos);
{ int candidate_pos = cur;
int selected_matchLength = best_mlen;
int selected_offset = best_off;
while (1) { /* from end to beginning */
int const next_matchLength = opt[candidate_pos].mlen; /* can be 1, means literal */
int const next_offset = opt[candidate_pos].off;
DEBUGLOG(6, "pos %i: sequence length %i", candidate_pos, selected_matchLength);
opt[candidate_pos].mlen = selected_matchLength;
opt[candidate_pos].off = selected_offset;
selected_matchLength = next_matchLength;
selected_offset = next_offset;
if (next_matchLength > candidate_pos) break; /* last match elected, first match to encode */
assert(next_matchLength > 0); /* can be 1, means literal */
candidate_pos -= next_matchLength;
} }
/* encode all recorded sequences in order */
{ int rPos = 0; /* relative position (to ip) */
while (rPos < last_match_pos) {
int const ml = opt[rPos].mlen;
int const offset = opt[rPos].off;
if (ml == 1) { ip++; rPos++; continue; } /* literal; note: can end up with several literals, in which case, skip them */
rPos += ml;
assert(ml >= MINMATCH);
assert((offset >= 1) && (offset <= MAX_DISTANCE));
if ( LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ip - offset, limit, oend) ) /* updates ip, op and anchor */
return 0; /* error */
} }
} /* while (ip < mflimit) */
/* Encode Last Literals */
{ int lastRun = (int)(iend - anchor);
if ( (limit)
&& (((char*)op - dst) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)dstCapacity))
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);
memcpy(op, anchor, iend - anchor);
op += iend-anchor;
}
/* End */
return (int) ((char*)op-dst);
}
src/modules/data/Compressor.cpp
+1 -1
View File
@@ -72,7 +72,7 @@ public:
// Use LZ4-HC for compression level 9 and higher.
int csize = 0;
if (level > 8)
csize = LZ4_compress_HC(data, compressedbytes + headersize, (int) dataSize, maxdestsize, 0);
csize = LZ4_compress_HC(data, compressedbytes + headersize, (int) dataSize, maxdestsize, LZ4HC_CLEVEL_DEFAULT);
else
csize = LZ4_compress_default(data, compressedbytes + headersize, (int) dataSize, maxdestsize);