HADOOP-17144. Update Hadoop's lz4 to v1.9.2. Contributed by Hemanth Boyina.
This commit is contained in:
hemanthboyina
parent
1e3a6efcef
commit
42e7e0380f
@ -44,6 +44,7 @@ public class Lz4Compressor implements Compressor {
|
||||
private byte[] userBuf = null;
|
||||
private int userBufOff = 0, userBufLen = 0;
|
||||
private boolean finish, finished;
|
||||
private int dstCapacity;
|
||||
|
||||
private long bytesRead = 0L;
|
||||
private long bytesWritten = 0L;
|
||||
@ -77,8 +78,14 @@ public Lz4Compressor(int directBufferSize, boolean useLz4HC) {
|
||||
this.directBufferSize = directBufferSize;
|
||||
|
||||
uncompressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
|
||||
compressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
|
||||
compressedDirectBuf.position(directBufferSize);
|
||||
|
||||
// Compression is guaranteed to succeed if 'dstCapacity' >=
|
||||
// LZ4_compressBound(srcSize)
|
||||
// whereas LZ4_compressBound(isize) is (isize) + ((isize)/255) + 16)
|
||||
this.dstCapacity = (directBufferSize) + ((directBufferSize) / 255) + 16;
|
||||
|
||||
compressedDirectBuf = ByteBuffer.allocateDirect(this.dstCapacity);
|
||||
compressedDirectBuf.position(this.dstCapacity);
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@ -30,7 +30,7 @@
|
||||
static jfieldID Lz4Compressor_uncompressedDirectBuf;
|
||||
static jfieldID Lz4Compressor_uncompressedDirectBufLen;
|
||||
static jfieldID Lz4Compressor_compressedDirectBuf;
|
||||
static jfieldID Lz4Compressor_directBufferSize;
|
||||
static jfieldID Lz4Compressor_dstCapacity;
|
||||
|
||||
|
||||
JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_initIDs
|
||||
@ -44,8 +44,8 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_init
|
||||
Lz4Compressor_compressedDirectBuf = (*env)->GetFieldID(env, clazz,
|
||||
"compressedDirectBuf",
|
||||
"Ljava/nio/Buffer;");
|
||||
Lz4Compressor_directBufferSize = (*env)->GetFieldID(env, clazz,
|
||||
"directBufferSize", "I");
|
||||
Lz4Compressor_dstCapacity = (*env)->GetFieldID(env, clazz,
|
||||
"dstCapacity", "I");
|
||||
}
|
||||
|
||||
JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_compressBytesDirect
|
||||
@ -57,7 +57,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_comp
|
||||
jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_uncompressedDirectBuf);
|
||||
jint uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen);
|
||||
jobject compressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_compressedDirectBuf);
|
||||
jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_directBufferSize);
|
||||
jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_dstCapacity);
|
||||
|
||||
// Get the input direct buffer
|
||||
uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
|
||||
@ -73,7 +73,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_comp
|
||||
return (jint)0;
|
||||
}
|
||||
|
||||
compressed_direct_buf_len = LZ4_compress(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len);
|
||||
compressed_direct_buf_len = LZ4_compress_default(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len, compressed_direct_buf_len);
|
||||
if (compressed_direct_buf_len < 0){
|
||||
THROW(env, "java/lang/InternalError", "LZ4_compress failed");
|
||||
}
|
||||
@ -101,7 +101,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_comp
|
||||
jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_uncompressedDirectBuf);
|
||||
jint uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen);
|
||||
jobject compressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_compressedDirectBuf);
|
||||
jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_directBufferSize);
|
||||
jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_dstCapacity);
|
||||
|
||||
// Get the input direct buffer
|
||||
uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
|
||||
@ -117,7 +117,7 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_comp
|
||||
return (jint)0;
|
||||
}
|
||||
|
||||
compressed_direct_buf_len = LZ4_compressHC(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len);
|
||||
compressed_direct_buf_len = LZ4_compress_HC(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len, compressed_direct_buf_len, 0);
|
||||
if (compressed_direct_buf_len < 0){
|
||||
THROW(env, "java/lang/InternalError", "LZ4_compressHC failed");
|
||||
}
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
@ -1,7 +1,8 @@
|
||||
/*
|
||||
LZ4 - Fast LZ compression algorithm
|
||||
Header File
|
||||
Copyright (C) 2011-2014, Yann Collet.
|
||||
* LZ4 - Fast LZ compression algorithm
|
||||
* Header File
|
||||
* Copyright (C) 2011-present, 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
|
||||
@ -28,294 +29,734 @@
|
||||
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 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 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.
|
||||
#ifndef LZ4_H_2983827168210
|
||||
#define LZ4_H_2983827168210
|
||||
|
||||
/* --- Dependency --- */
|
||||
#include <stddef.h> /* size_t */
|
||||
|
||||
|
||||
/**
|
||||
Introduction
|
||||
|
||||
LZ4 is lossless compression algorithm, providing compression speed >500 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.
|
||||
It gives full buffer control to user.
|
||||
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 generates and decodes LZ4-compressed blocks (doc/lz4_Block_format.md).
|
||||
Decompressing such a compressed block requires additional metadata.
|
||||
Exact metadata depends on exact decompression function.
|
||||
For the typical case of LZ4_decompress_safe(),
|
||||
metadata includes block's compressed size, and maximum bound of decompressed size.
|
||||
Each application is free to encode and pass such metadata in whichever way it wants.
|
||||
|
||||
lz4.h only handle blocks, it can not generate Frames.
|
||||
|
||||
Blocks are different from Frames (doc/lz4_Frame_format.md).
|
||||
Frames bundle both blocks and metadata in a specified manner.
|
||||
Embedding metadata is required for compressed data to be self-contained and portable.
|
||||
Frame format is delivered through a companion API, declared in lz4frame.h.
|
||||
The `lz4` CLI can only manage frames.
|
||||
*/
|
||||
|
||||
/**************************************
|
||||
Version
|
||||
**************************************/
|
||||
#define LZ4_VERSION_MAJOR 1 /* for major interface/format changes */
|
||||
#define LZ4_VERSION_MINOR 3 /* for minor interface/format changes */
|
||||
#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
|
||||
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
|
||||
int LZ4_versionNumber (void);
|
||||
|
||||
/**************************************
|
||||
Tuning parameter
|
||||
**************************************/
|
||||
/*^***************************************************************
|
||||
* 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 9 /* for new (non-breaking) interface capabilities */
|
||||
#define LZ4_VERSION_RELEASE 2 /* for tweaks, bug-fixes, or development */
|
||||
|
||||
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
|
||||
|
||||
#define LZ4_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; useful to check dll version */
|
||||
LZ4LIB_API const char* LZ4_versionString (void); /**< library version string; useful to check 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
|
||||
* Increasing memory usage improves compression ratio.
|
||||
* Reduced memory usage may improve speed, thanks to better cache locality.
|
||||
* 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
|
||||
/*-************************************
|
||||
* Simple Functions
|
||||
**************************************/
|
||||
/*! 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 'src' into a more limited 'dst' budget,
|
||||
* compression stops *immediately*, and the function result is zero.
|
||||
* In which case, 'dst' content is undefined (invalid).
|
||||
* srcSize : max supported value is LZ4_MAX_INPUT_SIZE.
|
||||
* dstCapacity : 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
|
||||
* Note : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
|
||||
*/
|
||||
LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
|
||||
|
||||
int LZ4_compress (const char* source, char* dest, int sourceSize);
|
||||
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_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).
|
||||
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.
|
||||
*/
|
||||
/*! 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), presumed an upper bound of decompressed size.
|
||||
* @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.
|
||||
* Note 1 : This function is protected against malicious data packets :
|
||||
* it will never writes outside 'dst' buffer, nor read outside 'source' buffer,
|
||||
* even if the compressed block is maliciously modified to order the decoder to do these actions.
|
||||
* In such case, the decoder stops immediately, and considers the compressed block malformed.
|
||||
* Note 2 : compressedSize and dstCapacity must be provided to the function, the compressed block does not contain them.
|
||||
* The implementation is free to send / store / derive this information in whichever way is most beneficial.
|
||||
* If there is a need for a different format which bundles together both compressed data and its metadata, consider looking at lz4frame.h instead.
|
||||
*/
|
||||
LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
|
||||
|
||||
|
||||
/**************************************
|
||||
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() :
|
||||
/*! 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
|
||||
Note that LZ4_compress_default() compresses faster when dstCapacity 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)
|
||||
or 0, if input size is incorrect (too large or negative)
|
||||
*/
|
||||
int LZ4_compressBound(int isize);
|
||||
LZ4LIB_API int LZ4_compressBound(int inputSize);
|
||||
|
||||
|
||||
/*
|
||||
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
|
||||
/*! LZ4_compress_fast() :
|
||||
Same as LZ4_compress_default(), but allows selection of "acceleration" factor.
|
||||
The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
|
||||
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 (currently == 1, see lz4.c).
|
||||
*/
|
||||
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
|
||||
LZ4LIB_API int LZ4_compress_fast (const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
|
||||
|
||||
|
||||
/*
|
||||
LZ4_compress_withState() :
|
||||
Same compression functions, but 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.
|
||||
/*! LZ4_compress_fast_extState() :
|
||||
* Same as LZ4_compress_fast(), using an externally allocated memory space for its state.
|
||||
* Use LZ4_sizeofState() to know how much memory must be allocated,
|
||||
* and allocate it on 8-bytes boundaries (using `malloc()` typically).
|
||||
* Then, provide this buffer as `void* state` to compression function.
|
||||
*/
|
||||
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 : 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'.
|
||||
* note: acceleration parameter is fixed to "default".
|
||||
*
|
||||
* *srcSizePtr : will be modified to indicate how many bytes where read from 'src' to fill 'dst'.
|
||||
* New value is necessarily <= input value.
|
||||
* @return : Nb bytes written into 'dst' (necessarily <= targetDestSize)
|
||||
* or 0 if compression fails.
|
||||
*/
|
||||
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);
|
||||
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
|
||||
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.
|
||||
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);
|
||||
/*! LZ4_decompress_safe_partial() :
|
||||
* Decompress an LZ4 compressed block, of size 'srcSize' at position 'src',
|
||||
* into destination buffer 'dst' of size 'dstCapacity'.
|
||||
* Up to 'targetOutputSize' bytes will be decoded.
|
||||
* The function stops decoding on reaching this objective,
|
||||
* which can boost performance when only the beginning of a block is required.
|
||||
*
|
||||
* @return : the number of bytes decoded in `dst` (necessarily <= dstCapacity)
|
||||
* If source stream is detected malformed, function returns a negative result.
|
||||
*
|
||||
* Note : @return can be < targetOutputSize, if compressed block contains less data.
|
||||
*
|
||||
* Note 2 : this function features 2 parameters, targetOutputSize and dstCapacity,
|
||||
* and expects targetOutputSize <= dstCapacity.
|
||||
* It effectively stops decoding on reaching targetOutputSize,
|
||||
* so dstCapacity is kind of redundant.
|
||||
* This is because in a previous version of this function,
|
||||
* decoding operation would not "break" a sequence in the middle.
|
||||
* As a consequence, there was no guarantee that decoding would stop at exactly targetOutputSize,
|
||||
* it could write more bytes, though only up to dstCapacity.
|
||||
* Some "margin" used to be required for this operation to work properly.
|
||||
* This is no longer necessary.
|
||||
* The function nonetheless keeps its signature, in an effort to not break API.
|
||||
*/
|
||||
LZ4LIB_API int LZ4_decompress_safe_partial (const char* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);
|
||||
|
||||
|
||||
/*
|
||||
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.
|
||||
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
|
||||
*/
|
||||
int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
|
||||
|
||||
|
||||
/***********************************************
|
||||
Experimental Streaming Compression Functions
|
||||
/*-*********************************************
|
||||
* Streaming Compression Functions
|
||||
***********************************************/
|
||||
typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
|
||||
|
||||
#define LZ4_STREAMSIZE_U32 ((1 << (LZ4_MEMORY_USAGE-2)) + 8)
|
||||
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U32 * sizeof(unsigned int))
|
||||
/*
|
||||
* LZ4_stream_t
|
||||
* information structure to track an LZ4 stream.
|
||||
* important : init this structure content before first use !
|
||||
LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
|
||||
LZ4LIB_API int LZ4_freeStream (LZ4_stream_t* streamPtr);
|
||||
|
||||
/*! LZ4_resetStream_fast() : v1.9.0+
|
||||
* Use this to prepare an LZ4_stream_t for a new chain of dependent blocks
|
||||
* (e.g., LZ4_compress_fast_continue()).
|
||||
*
|
||||
* An LZ4_stream_t must be initialized once before usage.
|
||||
* This is automatically done when created by LZ4_createStream().
|
||||
* However, should the LZ4_stream_t be simply declared on stack (for example),
|
||||
* it's necessary to initialize it first, using LZ4_initStream().
|
||||
*
|
||||
* After init, start any new stream with LZ4_resetStream_fast().
|
||||
* A same LZ4_stream_t can be re-used multiple times consecutively
|
||||
* and compress multiple streams,
|
||||
* provided that it starts each new stream with LZ4_resetStream_fast().
|
||||
*
|
||||
* LZ4_resetStream_fast() is much faster than LZ4_initStream(),
|
||||
* but is not compatible with memory regions containing garbage data.
|
||||
*
|
||||
* Note: it's only useful to call LZ4_resetStream_fast()
|
||||
* in the context of streaming compression.
|
||||
* The *extState* functions perform their own resets.
|
||||
* Invoking LZ4_resetStream_fast() before is redundant, and even counterproductive.
|
||||
*/
|
||||
typedef struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
|
||||
LZ4LIB_API void LZ4_resetStream_fast (LZ4_stream_t* streamPtr);
|
||||
|
||||
/*
|
||||
* LZ4_resetStream
|
||||
* Use this function to init an allocated LZ4_stream_t structure
|
||||
/*! LZ4_loadDict() :
|
||||
* Use this function to reference a static dictionary into LZ4_stream_t.
|
||||
* The dictionary must remain available during compression.
|
||||
* LZ4_loadDict() triggers a reset, so any previous data will be forgotten.
|
||||
* The same dictionary will have to be loaded on decompression side for successful decoding.
|
||||
* Dictionary are useful for better compression of small data (KB range).
|
||||
* While LZ4 accept any input as dictionary,
|
||||
* results are generally better when using Zstandard's Dictionary Builder.
|
||||
* Loading a size of 0 is allowed, and is the same as reset.
|
||||
* @return : loaded dictionary size, in bytes (necessarily <= 64 KB)
|
||||
*/
|
||||
void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
|
||||
LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
|
||||
|
||||
/*
|
||||
* If you prefer dynamic allocation methods,
|
||||
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
|
||||
* LZ4_freeStream releases its memory.
|
||||
/*! LZ4_compress_fast_continue() :
|
||||
* Compress 'src' content using data from previously compressed blocks, for better compression ratio.
|
||||
* 'dst' buffer must be already allocated.
|
||||
* If dstCapacity >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
|
||||
*
|
||||
* @return : size of compressed block
|
||||
* or 0 if there is an error (typically, cannot fit into 'dst').
|
||||
*
|
||||
* Note 1 : Each invocation to LZ4_compress_fast_continue() generates a new block.
|
||||
* Each block has precise boundaries.
|
||||
* Each block must be decompressed separately, calling LZ4_decompress_*() with relevant metadata.
|
||||
* It's not possible to append blocks together and expect a single invocation of LZ4_decompress_*() to decompress them together.
|
||||
*
|
||||
* Note 2 : The previous 64KB of source data is __assumed__ to remain present, unmodified, at same address in memory !
|
||||
*
|
||||
* Note 3 : When input is structured as a double-buffer, each buffer can have any size, including < 64 KB.
|
||||
* Make sure that buffers are separated, by at least one byte.
|
||||
* This construction ensures that each block only depends on previous block.
|
||||
*
|
||||
* Note 4 : If input buffer is a ring-buffer, it can have any size, including < 64 KB.
|
||||
*
|
||||
* Note 5 : After an error, the stream status is undefined (invalid), it can only be reset or freed.
|
||||
*/
|
||||
LZ4_stream_t* LZ4_createStream(void);
|
||||
int LZ4_freeStream (LZ4_stream_t* LZ4_stream);
|
||||
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
|
||||
|
||||
/*
|
||||
* 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 : 1 if OK, 0 if error
|
||||
/*! LZ4_saveDict() :
|
||||
* If last 64KB data cannot be guaranteed to remain available at its current memory location,
|
||||
* save it into a safer place (char* safeBuffer).
|
||||
* This is schematically equivalent to a memcpy() followed by LZ4_loadDict(),
|
||||
* but is much faster, because LZ4_saveDict() doesn't need to rebuild tables.
|
||||
* @return : saved dictionary size in bytes (necessarily <= maxDictSize), or 0 if error.
|
||||
*/
|
||||
int LZ4_loadDict (LZ4_stream_t* LZ4_stream, 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.
|
||||
*/
|
||||
int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, 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_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
int LZ4_saveDict (LZ4_stream_t* LZ4_stream, char* safeBuffer, int dictSize);
|
||||
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
|
||||
|
||||
|
||||
/************************************************
|
||||
Experimental Streaming Decompression Functions
|
||||
/*-**********************************************
|
||||
* Streaming Decompression Functions
|
||||
* Bufferless synchronous API
|
||||
************************************************/
|
||||
typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* tracking context */
|
||||
|
||||
#define LZ4_STREAMDECODESIZE_U32 4
|
||||
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
|
||||
/*
|
||||
* LZ4_streamDecode_t
|
||||
/*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
|
||||
* creation / destruction of streaming decompression tracking context.
|
||||
* A tracking context can be re-used multiple times.
|
||||
*/
|
||||
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
|
||||
LZ4LIB_API int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
|
||||
|
||||
/*! LZ4_setStreamDecode() :
|
||||
* An LZ4_streamDecode_t context can be allocated once and re-used multiple times.
|
||||
* Use this function to start decompression of a new stream of blocks.
|
||||
* A dictionary can optionally be set. Use NULL or size 0 for a reset order.
|
||||
* Dictionary is presumed stable : it must remain accessible and unmodified during next decompression.
|
||||
* @return : 1 if OK, 0 if error
|
||||
*/
|
||||
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
|
||||
|
||||
/*! LZ4_decoderRingBufferSize() : v1.8.2+
|
||||
* Note : in a ring buffer scenario (optional),
|
||||
* blocks are presumed decompressed next to each other
|
||||
* up to the moment there is not enough remaining space for next block (remainingSize < maxBlockSize),
|
||||
* at which stage it resumes from beginning of ring buffer.
|
||||
* When setting such a ring buffer for streaming decompression,
|
||||
* provides the minimum size of this ring buffer
|
||||
* to be compatible with any source respecting maxBlockSize condition.
|
||||
* @return : minimum ring buffer size,
|
||||
* or 0 if there is an error (invalid maxBlockSize).
|
||||
*/
|
||||
LZ4LIB_API int LZ4_decoderRingBufferSize(int maxBlockSize);
|
||||
#define LZ4_DECODER_RING_BUFFER_SIZE(maxBlockSize) (65536 + 14 + (maxBlockSize)) /* for static allocation; maxBlockSize presumed valid */
|
||||
|
||||
/*! 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 accepts one block at a time.
|
||||
* The last 64KB of previously decoded data *must* remain available and unmodified at the memory position where they were decoded.
|
||||
* If less than 64KB of data has been decoded, all the data must be present.
|
||||
*
|
||||
* Special : if decompression side sets a ring buffer, it must respect one of the following conditions :
|
||||
* - Decompression buffer size is _at least_ LZ4_decoderRingBufferSize(maxBlockSize).
|
||||
* maxBlockSize is the maximum size of any single block. It can have any value > 16 bytes.
|
||||
* In which case, encoding and decoding buffers do not need to be synchronized.
|
||||
* Actually, data can be produced by any source compliant with LZ4 format specification, and respecting maxBlockSize.
|
||||
* - Synchronized mode :
|
||||
* Decompression buffer size is _exactly_ the same as compression buffer size,
|
||||
* and follows exactly same update rule (block boundaries at same positions),
|
||||
* and decoding function is provided with exact decompressed size of each block (exception for last block of the stream),
|
||||
* _then_ decoding & encoding ring buffer can have any size, including small ones ( < 64 KB).
|
||||
* - Decompression buffer is larger than encoding buffer, by a minimum of maxBlockSize more bytes.
|
||||
* 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).
|
||||
*
|
||||
* Whenever these conditions are not possible,
|
||||
* save the last 64KB of decoded data into a safe buffer where it can't be modified during decompression,
|
||||
* then indicate where this data 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);
|
||||
|
||||
|
||||
/*! 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.
|
||||
* Dictionary is presumed stable : it must remain accessible and unmodified during decompression.
|
||||
* Performance tip : Decompression speed can be substantially increased
|
||||
* when dst == dictStart + dictSize.
|
||||
*/
|
||||
LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* src, char* dst, int srcSize, int dstCapcity, const char* dictStart, int dictSize);
|
||||
|
||||
#endif /* LZ4_H_2983827168210 */
|
||||
|
||||
|
||||
/*^*************************************
|
||||
* !!!!!! STATIC LINKING ONLY !!!!!!
|
||||
***************************************/
|
||||
|
||||
/*-****************************************************************************
|
||||
* Experimental section
|
||||
*
|
||||
* Symbols declared in this section must be considered unstable. Their
|
||||
* signatures or semantics may change, or they may be removed altogether in the
|
||||
* future. They are therefore only safe to depend on when the caller is
|
||||
* statically linked against the library.
|
||||
*
|
||||
* To protect against unsafe usage, not only are the declarations guarded,
|
||||
* the definitions are hidden by default
|
||||
* when building LZ4 as a shared/dynamic library.
|
||||
*
|
||||
* In order to access these declarations,
|
||||
* define LZ4_STATIC_LINKING_ONLY in your application
|
||||
* before including LZ4's headers.
|
||||
*
|
||||
* In order to make their implementations accessible dynamically, you must
|
||||
* define LZ4_PUBLISH_STATIC_FUNCTIONS when building the LZ4 library.
|
||||
******************************************************************************/
|
||||
|
||||
#ifdef LZ4_STATIC_LINKING_ONLY
|
||||
|
||||
#ifndef LZ4_STATIC_3504398509
|
||||
#define LZ4_STATIC_3504398509
|
||||
|
||||
#ifdef LZ4_PUBLISH_STATIC_FUNCTIONS
|
||||
#define LZ4LIB_STATIC_API LZ4LIB_API
|
||||
#else
|
||||
#define LZ4LIB_STATIC_API
|
||||
#endif
|
||||
|
||||
|
||||
/*! LZ4_compress_fast_extState_fastReset() :
|
||||
* A variant of LZ4_compress_fast_extState().
|
||||
*
|
||||
* Using this variant avoids an expensive initialization step.
|
||||
* It is only safe to call if the state buffer is known to be correctly initialized already
|
||||
* (see above comment on LZ4_resetStream_fast() for a definition of "correctly initialized").
|
||||
* From a high level, the difference is that
|
||||
* this function initializes the provided state with a call to something like LZ4_resetStream_fast()
|
||||
* while LZ4_compress_fast_extState() starts with a call to LZ4_resetStream().
|
||||
*/
|
||||
LZ4LIB_STATIC_API int LZ4_compress_fast_extState_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
|
||||
|
||||
/*! LZ4_attach_dictionary() :
|
||||
* This is an experimental API that allows
|
||||
* efficient use of a static dictionary many times.
|
||||
*
|
||||
* Rather than re-loading the dictionary buffer into a working context before
|
||||
* each compression, or copying a pre-loaded dictionary's LZ4_stream_t into a
|
||||
* working LZ4_stream_t, this function introduces a no-copy setup mechanism,
|
||||
* in which the working stream references the dictionary stream in-place.
|
||||
*
|
||||
* Several assumptions are made about the state of the dictionary stream.
|
||||
* Currently, only streams which have been prepared by LZ4_loadDict() should
|
||||
* be expected to work.
|
||||
*
|
||||
* Alternatively, the provided dictionaryStream may be NULL,
|
||||
* in which case any existing dictionary stream is unset.
|
||||
*
|
||||
* If a dictionary is provided, it replaces any pre-existing stream history.
|
||||
* The dictionary contents are the only history that can be referenced and
|
||||
* logically immediately precede the data compressed in the first subsequent
|
||||
* compression call.
|
||||
*
|
||||
* The dictionary will only remain attached to the working stream through the
|
||||
* first compression call, at the end of which it is cleared. The dictionary
|
||||
* stream (and source buffer) must remain in-place / accessible / unchanged
|
||||
* through the completion of the first compression call on the stream.
|
||||
*/
|
||||
LZ4LIB_STATIC_API void LZ4_attach_dictionary(LZ4_stream_t* workingStream, const LZ4_stream_t* dictionaryStream);
|
||||
|
||||
|
||||
/*! In-place compression and decompression
|
||||
*
|
||||
* It's possible to have input and output sharing the same buffer,
|
||||
* for highly contrained memory environments.
|
||||
* In both cases, it requires input to lay at the end of the buffer,
|
||||
* and decompression to start at beginning of the buffer.
|
||||
* Buffer size must feature some margin, hence be larger than final size.
|
||||
*
|
||||
* |<------------------------buffer--------------------------------->|
|
||||
* |<-----------compressed data--------->|
|
||||
* |<-----------decompressed size------------------>|
|
||||
* |<----margin---->|
|
||||
*
|
||||
* This technique is more useful for decompression,
|
||||
* since decompressed size is typically larger,
|
||||
* and margin is short.
|
||||
*
|
||||
* In-place decompression will work inside any buffer
|
||||
* which size is >= LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize).
|
||||
* This presumes that decompressedSize > compressedSize.
|
||||
* Otherwise, it means compression actually expanded data,
|
||||
* and it would be more efficient to store such data with a flag indicating it's not compressed.
|
||||
* This can happen when data is not compressible (already compressed, or encrypted).
|
||||
*
|
||||
* For in-place compression, margin is larger, as it must be able to cope with both
|
||||
* history preservation, requiring input data to remain unmodified up to LZ4_DISTANCE_MAX,
|
||||
* and data expansion, which can happen when input is not compressible.
|
||||
* As a consequence, buffer size requirements are much higher,
|
||||
* and memory savings offered by in-place compression are more limited.
|
||||
*
|
||||
* There are ways to limit this cost for compression :
|
||||
* - Reduce history size, by modifying LZ4_DISTANCE_MAX.
|
||||
* Note that it is a compile-time constant, so all compressions will apply this limit.
|
||||
* Lower values will reduce compression ratio, except when input_size < LZ4_DISTANCE_MAX,
|
||||
* so it's a reasonable trick when inputs are known to be small.
|
||||
* - Require the compressor to deliver a "maximum compressed size".
|
||||
* This is the `dstCapacity` parameter in `LZ4_compress*()`.
|
||||
* When this size is < LZ4_COMPRESSBOUND(inputSize), then compression can fail,
|
||||
* in which case, the return code will be 0 (zero).
|
||||
* The caller must be ready for these cases to happen,
|
||||
* and typically design a backup scheme to send data uncompressed.
|
||||
* The combination of both techniques can significantly reduce
|
||||
* the amount of margin required for in-place compression.
|
||||
*
|
||||
* In-place compression can work in any buffer
|
||||
* which size is >= (maxCompressedSize)
|
||||
* with maxCompressedSize == LZ4_COMPRESSBOUND(srcSize) for guaranteed compression success.
|
||||
* LZ4_COMPRESS_INPLACE_BUFFER_SIZE() depends on both maxCompressedSize and LZ4_DISTANCE_MAX,
|
||||
* so it's possible to reduce memory requirements by playing with them.
|
||||
*/
|
||||
|
||||
#define LZ4_DECOMPRESS_INPLACE_MARGIN(compressedSize) (((compressedSize) >> 8) + 32)
|
||||
#define LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize) ((decompressedSize) + LZ4_DECOMPRESS_INPLACE_MARGIN(decompressedSize)) /**< note: presumes that compressedSize < decompressedSize. note2: margin is overestimated a bit, since it could use compressedSize instead */
|
||||
|
||||
#ifndef LZ4_DISTANCE_MAX /* history window size; can be user-defined at compile time */
|
||||
# define LZ4_DISTANCE_MAX 65535 /* set to maximum value by default */
|
||||
#endif
|
||||
|
||||
#define LZ4_COMPRESS_INPLACE_MARGIN (LZ4_DISTANCE_MAX + 32) /* LZ4_DISTANCE_MAX can be safely replaced by srcSize when it's smaller */
|
||||
#define LZ4_COMPRESS_INPLACE_BUFFER_SIZE(maxCompressedSize) ((maxCompressedSize) + LZ4_COMPRESS_INPLACE_MARGIN) /**< maxCompressedSize is generally LZ4_COMPRESSBOUND(inputSize), but can be set to any lower value, with the risk that compression can fail (return code 0(zero)) */
|
||||
|
||||
#endif /* LZ4_STATIC_3504398509 */
|
||||
#endif /* LZ4_STATIC_LINKING_ONLY */
|
||||
|
||||
|
||||
|
||||
#ifndef LZ4_H_98237428734687
|
||||
#define LZ4_H_98237428734687
|
||||
|
||||
/*-************************************************************
|
||||
* PRIVATE DEFINITIONS
|
||||
**************************************************************
|
||||
* Do not use these definitions directly.
|
||||
* They are only exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
|
||||
* Accessing members 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 LZ4_stream_t_internal LZ4_stream_t_internal;
|
||||
struct LZ4_stream_t_internal {
|
||||
uint32_t hashTable[LZ4_HASH_SIZE_U32];
|
||||
uint32_t currentOffset;
|
||||
uint16_t dirty;
|
||||
uint16_t tableType;
|
||||
const uint8_t* dictionary;
|
||||
const LZ4_stream_t_internal* dictCtx;
|
||||
uint32_t dictSize;
|
||||
};
|
||||
|
||||
typedef struct {
|
||||
const uint8_t* externalDict;
|
||||
size_t extDictSize;
|
||||
const uint8_t* prefixEnd;
|
||||
size_t prefixSize;
|
||||
} LZ4_streamDecode_t_internal;
|
||||
|
||||
#else
|
||||
|
||||
typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
|
||||
struct LZ4_stream_t_internal {
|
||||
unsigned int hashTable[LZ4_HASH_SIZE_U32];
|
||||
unsigned int currentOffset;
|
||||
unsigned short dirty;
|
||||
unsigned short tableType;
|
||||
const unsigned char* dictionary;
|
||||
const LZ4_stream_t_internal* dictCtx;
|
||||
unsigned int dictSize;
|
||||
};
|
||||
|
||||
typedef struct {
|
||||
const unsigned char* externalDict;
|
||||
const unsigned char* prefixEnd;
|
||||
size_t extDictSize;
|
||||
size_t prefixSize;
|
||||
} LZ4_streamDecode_t_internal;
|
||||
|
||||
#endif
|
||||
|
||||
/*! LZ4_stream_t :
|
||||
* information structure to track an LZ4 stream.
|
||||
* important : init this structure content using LZ4_setStreamDecode or memset() before first use !
|
||||
* LZ4_stream_t can also be created using LZ4_createStream(), which is recommended.
|
||||
* The structure definition can be convenient for static allocation
|
||||
* (on stack, or as part of larger structure).
|
||||
* Init this structure with LZ4_initStream() before first use.
|
||||
* note : only use this definition in association with static linking !
|
||||
* this definition is not API/ABI safe, and may change in a future version.
|
||||
*/
|
||||
typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
|
||||
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4 + ((sizeof(void*)==16) ? 4 : 0) /*AS-400*/ )
|
||||
#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_setStreamDecode
|
||||
* Use this function to instruct where to find the dictionary.
|
||||
* This function can be used to specify a static dictionary,
|
||||
* or to instruct where to find some previously decoded data saved into a different memory space.
|
||||
* Setting a size of 0 is allowed (same effect as no dictionary).
|
||||
* Return : 1 if OK, 0 if error
|
||||
/*! LZ4_initStream() : v1.9.0+
|
||||
* An LZ4_stream_t structure must be initialized at least once.
|
||||
* This is automatically done when invoking LZ4_createStream(),
|
||||
* but it's not when the structure is simply declared on stack (for example).
|
||||
*
|
||||
* Use LZ4_initStream() to properly initialize a newly declared LZ4_stream_t.
|
||||
* It can also initialize any arbitrary buffer of sufficient size,
|
||||
* and will @return a pointer of proper type upon initialization.
|
||||
*
|
||||
* Note : initialization fails if size and alignment conditions are not respected.
|
||||
* In which case, the function will @return NULL.
|
||||
* Note2: An LZ4_stream_t structure guarantees correct alignment and size.
|
||||
* Note3: Before v1.9.0, use LZ4_resetStream() instead
|
||||
*/
|
||||
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
|
||||
LZ4LIB_API LZ4_stream_t* LZ4_initStream (void* buffer, size_t size);
|
||||
|
||||
/*
|
||||
* If you prefer dynamic allocation methods,
|
||||
* LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
|
||||
* LZ4_freeStreamDecode releases its memory.
|
||||
|
||||
/*! LZ4_streamDecode_t :
|
||||
* information structure to track an LZ4 stream during decompression.
|
||||
* init this structure using LZ4_setStreamDecode() 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 !
|
||||
*/
|
||||
LZ4_streamDecode_t* LZ4_createStreamDecode(void);
|
||||
int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
|
||||
|
||||
/*
|
||||
*_continue() :
|
||||
These decoding functions allow decompression of multiple blocks in "streaming" mode.
|
||||
Previously decoded blocks must still be available at the memory position where they were decoded.
|
||||
If it's not possible, save the relevant part of decoded data into a safe buffer,
|
||||
and indicate where its new address 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);
|
||||
|
||||
|
||||
/*
|
||||
Advanced decoding functions :
|
||||
*_usingDict() :
|
||||
These decoding functions work the same as
|
||||
a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
|
||||
They don't use 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);
|
||||
#define LZ4_STREAMDECODESIZE_U64 (4 + ((sizeof(void*)==16) ? 2 : 0) /*AS-400*/ )
|
||||
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
|
||||
union LZ4_streamDecode_u {
|
||||
unsigned long long table[LZ4_STREAMDECODESIZE_U64];
|
||||
LZ4_streamDecode_t_internal internal_donotuse;
|
||||
} ; /* previously typedef'd to LZ4_streamDecode_t */
|
||||
|
||||
|
||||
|
||||
/**************************************
|
||||
Obsolete Functions
|
||||
/*-************************************
|
||||
* 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 migrated to newer ones */
|
||||
/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
|
||||
/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
|
||||
|
||||
/*
|
||||
* If you prefer dynamic allocation methods,
|
||||
* LZ4_createStreamDecode()
|
||||
* provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
|
||||
* LZ4_free just frees it.
|
||||
/*! Deprecation warnings
|
||||
*
|
||||
* Deprecated functions make the compiler generate a warning when invoked.
|
||||
* This is meant to invite users to update their source code.
|
||||
* Should deprecation warnings be a problem, it is generally possible to disable them,
|
||||
* typically with -Wno-deprecated-declarations for gcc
|
||||
* or _CRT_SECURE_NO_WARNINGS in Visual.
|
||||
*
|
||||
* Another method is to define LZ4_DISABLE_DEPRECATE_WARNINGS
|
||||
* before including the header file.
|
||||
*/
|
||||
/* void* LZ4_createStreamDecode(void); */
|
||||
/*int LZ4_free (void* LZ4_stream); yes, it's the same one as for compression */
|
||||
#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
|
||||
# define LZ4_DEPRECATED(message) /* disable deprecation warnings */
|
||||
#else
|
||||
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
|
||||
# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
|
||||
# define LZ4_DEPRECATED(message) [[deprecated(message)]]
|
||||
# elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
|
||||
# elif (LZ4_GCC_VERSION >= 301)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
|
||||
# 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_DISABLE_DEPRECATE_WARNINGS */
|
||||
|
||||
/* 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);
|
||||
/* Obsolete compression functions */
|
||||
LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress (const char* src, char* dest, int srcSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress_limitedOutput (const char* src, char* dest, int srcSize, int maxOutputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
/* Obsolete decompression functions */
|
||||
LZ4_DEPRECATED("use LZ4_decompress_fast() instead") LZ4LIB_API int LZ4_uncompress (const char* source, char* dest, int outputSize);
|
||||
LZ4_DEPRECATED("use LZ4_decompress_safe() instead") LZ4LIB_API int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
|
||||
|
||||
/* Obsolete streaming functions; degraded functionality; do not use!
|
||||
*
|
||||
* In order to perform streaming compression, these functions depended on data
|
||||
* that is no longer tracked in the state. They have been preserved as well as
|
||||
* possible: using them will still produce a correct output. However, they don't
|
||||
* actually retain any history between compression calls. The compression ratio
|
||||
* achieved will therefore be no better than compressing each chunk
|
||||
* independently.
|
||||
*/
|
||||
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API void* LZ4_create (char* inputBuffer);
|
||||
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API int LZ4_sizeofStreamState(void);
|
||||
LZ4_DEPRECATED("Use LZ4_resetStream() instead") LZ4LIB_API int LZ4_resetStreamState(void* state, char* inputBuffer);
|
||||
LZ4_DEPRECATED("Use LZ4_saveDict() instead") LZ4LIB_API char* LZ4_slideInputBuffer (void* state);
|
||||
|
||||
/* Obsolete streaming decoding functions */
|
||||
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") LZ4LIB_API int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
|
||||
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") LZ4LIB_API int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
|
||||
|
||||
/*! LZ4_decompress_fast() : **unsafe!**
|
||||
* These functions used to be faster than LZ4_decompress_safe(),
|
||||
* but it has changed, and they are now slower than LZ4_decompress_safe().
|
||||
* This is because LZ4_decompress_fast() doesn't know the input size,
|
||||
* and therefore must progress more cautiously in the input buffer to not read beyond the end of block.
|
||||
* On top of that `LZ4_decompress_fast()` is not protected vs malformed or malicious inputs, making it a security liability.
|
||||
* As a consequence, LZ4_decompress_fast() is strongly discouraged, and deprecated.
|
||||
*
|
||||
* The last remaining LZ4_decompress_fast() specificity is that
|
||||
* it can decompress a block without knowing its compressed size.
|
||||
* Such functionality could be achieved in a more secure manner,
|
||||
* by also providing the maximum size of input buffer,
|
||||
* but it would require new prototypes, and adaptation of the implementation to this new use case.
|
||||
*
|
||||
* Parameters:
|
||||
* originalSize : is the uncompressed size to regenerate.
|
||||
* `dst` must be already allocated, its size must be >= 'originalSize' bytes.
|
||||
* @return : number of bytes read from source buffer (== compressed size).
|
||||
* The function expects to finish at block's end exactly.
|
||||
* If the source stream is detected malformed, the function stops decoding and returns a negative result.
|
||||
* note : LZ4_decompress_fast*() requires originalSize. Thanks to this information, it never writes past the output buffer.
|
||||
* However, since it doesn't know its 'src' size, it may read an unknown amount of input, past input buffer bounds.
|
||||
* Also, since match offsets are not validated, match reads from 'src' may underflow too.
|
||||
* These issues never happen if input (compressed) data is correct.
|
||||
* But they may happen if input data is invalid (error or intentional tampering).
|
||||
* As a consequence, use these functions in trusted environments with trusted data **only**.
|
||||
*/
|
||||
|
||||
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe() instead")
|
||||
LZ4LIB_API int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
|
||||
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_continue() instead")
|
||||
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
|
||||
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_usingDict() instead")
|
||||
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
|
||||
|
||||
/*! LZ4_resetStream() :
|
||||
* An LZ4_stream_t structure must be initialized at least once.
|
||||
* This is done with LZ4_initStream(), or LZ4_resetStream().
|
||||
* Consider switching to LZ4_initStream(),
|
||||
* invoking LZ4_resetStream() will trigger deprecation warnings in the future.
|
||||
*/
|
||||
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
|
||||
|
||||
|
||||
#endif /* LZ4_H_98237428734687 */
|
||||
|
||||
|
||||
#if defined (__cplusplus)
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
@ -1,7 +1,7 @@
|
||||
/*
|
||||
LZ4 HC - High Compression Mode of LZ4
|
||||
Header File
|
||||
Copyright (C) 2011-2014, 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
|
||||
@ -28,146 +28,411 @@
|
||||
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/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
|
||||
|
||||
|
||||
int LZ4_compressHC (const char* source, char* dest, int inputSize);
|
||||
/*
|
||||
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")
|
||||
*/
|
||||
|
||||
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.
|
||||
*/
|
||||
/* --- Dependency --- */
|
||||
/* note : lz4hc requires lz4.h/lz4.c for compilation */
|
||||
#include "lz4.h" /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
|
||||
|
||||
|
||||
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.
|
||||
*/
|
||||
/* --- Useful constants --- */
|
||||
#define LZ4HC_CLEVEL_MIN 3
|
||||
#define LZ4HC_CLEVEL_DEFAULT 9
|
||||
#define LZ4HC_CLEVEL_OPT_MIN 10
|
||||
#define LZ4HC_CLEVEL_MAX 12
|
||||
|
||||
|
||||
/*-************************************
|
||||
* Block Compression
|
||||
**************************************/
|
||||
/*! LZ4_compress_HC() :
|
||||
* Compress data from `src` into `dst`, using the 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)
|
||||
*/
|
||||
|
||||
|
||||
/*! 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* stateHC, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
|
||||
|
||||
|
||||
/*! LZ4_compress_HC_destSize() : v1.9.0+
|
||||
* Will compress as much data as possible from `src`
|
||||
* to fit into `targetDstSize` budget.
|
||||
* Result is provided in 2 parts :
|
||||
* @return : the number of bytes written into 'dst' (necessarily <= targetDstSize)
|
||||
* or 0 if compression fails.
|
||||
* `srcSizePtr` : on success, *srcSizePtr is updated to indicate how much bytes were read from `src`
|
||||
*/
|
||||
LZ4LIB_API int LZ4_compress_HC_destSize(void* stateHC,
|
||||
const char* src, char* dst,
|
||||
int* srcSizePtr, int targetDstSize,
|
||||
int compressionLevel);
|
||||
|
||||
|
||||
/*-************************************
|
||||
* Streaming Compression
|
||||
* Bufferless synchronous API
|
||||
**************************************/
|
||||
typedef union LZ4_streamHC_u LZ4_streamHC_t; /* incomplete type (defined later) */
|
||||
|
||||
/*! LZ4_createStreamHC() and LZ4_freeStreamHC() :
|
||||
* These functions create and release memory for LZ4 HC streaming state.
|
||||
* Newly created states are automatically initialized.
|
||||
* A same state can be used multiple times consecutively,
|
||||
* starting with LZ4_resetStreamHC_fast() to start a new stream of blocks.
|
||||
*/
|
||||
LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
|
||||
LZ4LIB_API int LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
|
||||
|
||||
/*
|
||||
These functions compress data in successive blocks of any size,
|
||||
using previous blocks as dictionary, to improve compression ratio.
|
||||
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 than 64 KB.
|
||||
Ring-buffer scenario is automatically detected and handled within LZ4_compress_HC_continue().
|
||||
|
||||
Before starting compression, state must be allocated and properly initialized.
|
||||
LZ4_createStreamHC() does both, though compression level is set to LZ4HC_CLEVEL_DEFAULT.
|
||||
|
||||
Selecting the compression level can be done with LZ4_resetStreamHC_fast() (starts a new stream)
|
||||
or LZ4_setCompressionLevel() (anytime, between blocks in the same stream) (experimental).
|
||||
LZ4_resetStreamHC_fast() only works on states which have been properly initialized at least once,
|
||||
which is automatically the case when state is created using LZ4_createStreamHC().
|
||||
|
||||
After reset, a first "fictional block" can be designated as initial dictionary,
|
||||
using LZ4_loadDictHC() (Optional).
|
||||
|
||||
Invoke LZ4_compress_HC_continue() to compress each successive block.
|
||||
The number of blocks is unlimited.
|
||||
Previous input blocks, including initial dictionary when present,
|
||||
must remain accessible and unmodified during compression.
|
||||
|
||||
It's allowed to update compression level anytime between blocks,
|
||||
using LZ4_setCompressionLevel() (experimental).
|
||||
|
||||
'dst' buffer should be sized to handle worst case scenarios
|
||||
(see LZ4_compressBound(), it ensures compression success).
|
||||
In case of failure, the API does not guarantee recovery,
|
||||
so the state _must_ be reset.
|
||||
To ensure compression success
|
||||
whenever `dst` buffer size cannot be made >= LZ4_compressBound(),
|
||||
consider using LZ4_compress_HC_continue_destSize().
|
||||
|
||||
Whenever previous input blocks can't be preserved unmodified in-place during compression of next blocks,
|
||||
it's possible to copy the last blocks into a more stable memory space, using LZ4_saveDictHC().
|
||||
Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer' (<= 64 KB)
|
||||
|
||||
After completing a streaming compression,
|
||||
it's possible to start a new stream of blocks, using the same LZ4_streamHC_t state,
|
||||
just by resetting it, using LZ4_resetStreamHC_fast().
|
||||
*/
|
||||
|
||||
LZ4LIB_API void LZ4_resetStreamHC_fast(LZ4_streamHC_t* streamHCPtr, int compressionLevel); /* v1.9.0+ */
|
||||
LZ4LIB_API int LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
|
||||
|
||||
/**************************************
|
||||
Using an external allocation
|
||||
LZ4LIB_API int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr,
|
||||
const char* src, char* dst,
|
||||
int srcSize, int maxDstSize);
|
||||
|
||||
/*! LZ4_compress_HC_continue_destSize() : v1.9.0+
|
||||
* Similar to LZ4_compress_HC_continue(),
|
||||
* but will read as much data as possible from `src`
|
||||
* to fit into `targetDstSize` budget.
|
||||
* Result is provided into 2 parts :
|
||||
* @return : the number of bytes written into 'dst' (necessarily <= targetDstSize)
|
||||
* or 0 if compression fails.
|
||||
* `srcSizePtr` : on success, *srcSizePtr will be updated to indicate how much bytes were read from `src`.
|
||||
* Note that this function may not consume the entire input.
|
||||
*/
|
||||
LZ4LIB_API int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
|
||||
const char* src, char* dst,
|
||||
int* srcSizePtr, int targetDstSize);
|
||||
|
||||
LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
|
||||
|
||||
|
||||
|
||||
/*^**********************************************
|
||||
* !!!!!! STATIC LINKING ONLY !!!!!!
|
||||
***********************************************/
|
||||
|
||||
/*-******************************************************************
|
||||
* PRIVATE DEFINITIONS :
|
||||
* Do not use these definitions directly.
|
||||
* They are merely exposed to allow static allocation of `LZ4_streamHC_t`.
|
||||
* Declare an `LZ4_streamHC_t` directly, rather than any type below.
|
||||
* Even then, only do so in the context of static linking, as definitions may change between versions.
|
||||
********************************************************************/
|
||||
|
||||
#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 LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
|
||||
struct LZ4HC_CCtx_internal
|
||||
{
|
||||
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 */
|
||||
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 */
|
||||
short compressionLevel;
|
||||
int8_t favorDecSpeed; /* favor decompression speed if this flag set,
|
||||
otherwise, favor compression ratio */
|
||||
int8_t dirty; /* stream has to be fully reset if this flag is set */
|
||||
const LZ4HC_CCtx_internal* dictCtx;
|
||||
};
|
||||
|
||||
#else
|
||||
|
||||
typedef struct LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
|
||||
struct LZ4HC_CCtx_internal
|
||||
{
|
||||
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 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 */
|
||||
short compressionLevel;
|
||||
char favorDecSpeed; /* favor decompression speed if this flag set,
|
||||
otherwise, favor compression ratio */
|
||||
char dirty; /* stream has to be fully reset if this flag is set */
|
||||
const LZ4HC_CCtx_internal* dictCtx;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
/* Do not use these definitions directly !
|
||||
* Declare or allocate an LZ4_streamHC_t instead.
|
||||
*/
|
||||
#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56 + ((sizeof(void*)==16) ? 56 : 0) /* AS400*/ ) /* 262200 or 262256*/
|
||||
#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.
|
||||
* This can be used to allocate statically, on state, or as part of a larger structure.
|
||||
*
|
||||
* Such state **must** be initialized using LZ4_initStreamHC() before first use.
|
||||
*
|
||||
* Note that invoking LZ4_initStreamHC() is not required when
|
||||
* the state was created using LZ4_createStreamHC() (which is recommended).
|
||||
* Using the normal builder, a newly created state is automatically initialized.
|
||||
*
|
||||
* Static allocation shall only be used in combination with static linking.
|
||||
*/
|
||||
|
||||
/* LZ4_initStreamHC() : v1.9.0+
|
||||
* Required before first use of a statically allocated LZ4_streamHC_t.
|
||||
* Before v1.9.0 : use LZ4_resetStreamHC() instead
|
||||
*/
|
||||
LZ4LIB_API LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size);
|
||||
|
||||
|
||||
/*-************************************
|
||||
* Deprecated Functions
|
||||
**************************************/
|
||||
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);
|
||||
/* see lz4.h LZ4_DISABLE_DEPRECATE_WARNINGS to turn off deprecation warnings */
|
||||
|
||||
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);
|
||||
/* deprecated compression functions */
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC (const char* source, char* dest, int inputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
/*
|
||||
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();
|
||||
|
||||
Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0).
|
||||
|
||||
The allocated memory can be provided to the compressions 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 area instead of allocating their own (on stack, or on heap).
|
||||
*/
|
||||
/* Obsolete streaming functions; degraded functionality; do not use!
|
||||
*
|
||||
* In order to perform streaming compression, these functions depended on data
|
||||
* that is no longer tracked in the state. They have been preserved as well as
|
||||
* possible: using them will still produce a correct output. However, use of
|
||||
* LZ4_slideInputBufferHC() will truncate the history of the stream, rather
|
||||
* than preserve a window-sized chunk of history.
|
||||
*/
|
||||
LZ4_DEPRECATED("use LZ4_createStreamHC() instead") LZ4LIB_API void* LZ4_createHC (const char* inputBuffer);
|
||||
LZ4_DEPRECATED("use LZ4_saveDictHC() instead") LZ4LIB_API char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
|
||||
LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") LZ4LIB_API int LZ4_freeHC (void* LZ4HC_Data);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API 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") LZ4LIB_API int LZ4_sizeofStreamStateHC(void);
|
||||
LZ4_DEPRECATED("use LZ4_initStreamHC() instead") LZ4LIB_API int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
|
||||
|
||||
|
||||
/**************************************
|
||||
Streaming Functions
|
||||
**************************************/
|
||||
/* Note : these streaming functions still follows the older model */
|
||||
void* LZ4_createHC (const char* inputBuffer);
|
||||
int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
|
||||
int LZ4_freeHC (void* LZ4HC_Data);
|
||||
|
||||
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);
|
||||
|
||||
/*
|
||||
These functions allow the compression of dependent blocks, where each block benefits from prior 64 KB within preceding blocks.
|
||||
In order to achieve this, it is necessary to start creating the LZ4HC Data Structure, thanks to the function :
|
||||
|
||||
void* LZ4_createHC (const char* inputBuffer);
|
||||
The result of the function is the (void*) pointer on the LZ4HC Data Structure.
|
||||
This pointer will be needed in all other functions.
|
||||
If the pointer returned is NULL, then the allocation has failed, and compression must be aborted.
|
||||
The only parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
|
||||
The input buffer must be already allocated, and size at least 192KB.
|
||||
'inputBuffer' will also be the 'const char* source' of the first block.
|
||||
|
||||
All blocks are expected to lay next to each other within the input buffer, starting from 'inputBuffer'.
|
||||
To compress each block, use either LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue().
|
||||
Their behavior are identical to LZ4_compressHC() or LZ4_compressHC_limitedOutput(),
|
||||
but require the LZ4HC Data Structure as their first argument, and check that each block starts right after the previous one.
|
||||
If next block does not begin immediately after the previous one, the compression will fail (return 0).
|
||||
|
||||
When it's no longer possible to lay the next block after the previous one (not enough space left into input buffer), a call to :
|
||||
char* LZ4_slideInputBufferHC(void* LZ4HC_Data);
|
||||
must be performed. It will typically copy the latest 64KB of input at the beginning of input buffer.
|
||||
Note that, for this function to work properly, minimum size of an input buffer must be 192KB.
|
||||
==> The memory position where the next input data block must start is provided as the result of the function.
|
||||
|
||||
Compression can then resume, using LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(), as usual.
|
||||
|
||||
When compression is completed, a call to LZ4_freeHC() will release the memory used by the LZ4HC Data Structure.
|
||||
*/
|
||||
|
||||
int LZ4_sizeofStreamStateHC(void);
|
||||
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
|
||||
|
||||
/*
|
||||
These functions achieve the same result as :
|
||||
void* LZ4_createHC (const char* inputBuffer);
|
||||
|
||||
They are provided here to allow the user program to allocate memory using its own routines.
|
||||
|
||||
To know how much space must be allocated, use LZ4_sizeofStreamStateHC();
|
||||
Note also that space must be aligned for pointers (32 or 64 bits).
|
||||
|
||||
Once space is allocated, you must initialize it using : LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
|
||||
void* state is a pointer to the space allocated.
|
||||
It must be aligned for pointers (32 or 64 bits), and be large enough.
|
||||
The parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
|
||||
The input buffer must be already allocated, and size at least 192KB.
|
||||
'inputBuffer' will also be the 'const char* source' of the first block.
|
||||
|
||||
The same space can be re-used multiple times, just by initializing it each time with LZ4_resetStreamState().
|
||||
return value of LZ4_resetStreamStateHC() must be 0 is OK.
|
||||
Any other value means there was an error (typically, state is not aligned for pointers (32 or 64 bits)).
|
||||
*/
|
||||
/* LZ4_resetStreamHC() is now replaced by LZ4_initStreamHC().
|
||||
* The intention is to emphasize the difference with LZ4_resetStreamHC_fast(),
|
||||
* which is now the recommended function to start a new stream of blocks,
|
||||
* but cannot be used to initialize a memory segment containing arbitrary garbage data.
|
||||
*
|
||||
* It is recommended to switch to LZ4_initStreamHC().
|
||||
* LZ4_resetStreamHC() will generate deprecation warnings in a future version.
|
||||
*/
|
||||
LZ4LIB_API void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
|
||||
|
||||
|
||||
#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
|
||||
|
||||
#define LZ4_STATIC_LINKING_ONLY /* LZ4LIB_STATIC_API */
|
||||
#include "lz4.h"
|
||||
|
||||
#if defined (__cplusplus)
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/*! LZ4_setCompressionLevel() : v1.8.0+ (experimental)
|
||||
* It's possible to change compression level
|
||||
* between successive invocations of LZ4_compress_HC_continue*()
|
||||
* for dynamic adaptation.
|
||||
*/
|
||||
LZ4LIB_STATIC_API void LZ4_setCompressionLevel(
|
||||
LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
|
||||
|
||||
/*! LZ4_favorDecompressionSpeed() : v1.8.2+ (experimental)
|
||||
* Opt. Parser will favor decompression speed over compression ratio.
|
||||
* Only applicable to levels >= LZ4HC_CLEVEL_OPT_MIN.
|
||||
*/
|
||||
LZ4LIB_STATIC_API void LZ4_favorDecompressionSpeed(
|
||||
LZ4_streamHC_t* LZ4_streamHCPtr, int favor);
|
||||
|
||||
/*! LZ4_resetStreamHC_fast() : v1.9.0+
|
||||
* When an LZ4_streamHC_t is known to be in a internally coherent state,
|
||||
* it can often be prepared for a new compression with almost no work, only
|
||||
* sometimes falling back to the full, expensive reset that is always required
|
||||
* when the stream is in an indeterminate state (i.e., the reset performed by
|
||||
* LZ4_resetStreamHC()).
|
||||
*
|
||||
* LZ4_streamHCs are guaranteed to be in a valid state when:
|
||||
* - returned from LZ4_createStreamHC()
|
||||
* - reset by LZ4_resetStreamHC()
|
||||
* - memset(stream, 0, sizeof(LZ4_streamHC_t))
|
||||
* - the stream was in a valid state and was reset by LZ4_resetStreamHC_fast()
|
||||
* - the stream was in a valid state and was then used in any compression call
|
||||
* that returned success
|
||||
* - the stream was in an indeterminate state and was used in a compression
|
||||
* call that fully reset the state (LZ4_compress_HC_extStateHC()) and that
|
||||
* returned success
|
||||
*
|
||||
* Note:
|
||||
* A stream that was last used in a compression call that returned an error
|
||||
* may be passed to this function. However, it will be fully reset, which will
|
||||
* clear any existing history and settings from the context.
|
||||
*/
|
||||
LZ4LIB_STATIC_API void LZ4_resetStreamHC_fast(
|
||||
LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
|
||||
|
||||
/*! LZ4_compress_HC_extStateHC_fastReset() :
|
||||
* A variant of LZ4_compress_HC_extStateHC().
|
||||
*
|
||||
* Using this variant avoids an expensive initialization step. It is only safe
|
||||
* to call if the state buffer is known to be correctly initialized already
|
||||
* (see above comment on LZ4_resetStreamHC_fast() for a definition of
|
||||
* "correctly initialized"). From a high level, the difference is that this
|
||||
* function initializes the provided state with a call to
|
||||
* LZ4_resetStreamHC_fast() while LZ4_compress_HC_extStateHC() starts with a
|
||||
* call to LZ4_resetStreamHC().
|
||||
*/
|
||||
LZ4LIB_STATIC_API int LZ4_compress_HC_extStateHC_fastReset (
|
||||
void* state,
|
||||
const char* src, char* dst,
|
||||
int srcSize, int dstCapacity,
|
||||
int compressionLevel);
|
||||
|
||||
/*! LZ4_attach_HC_dictionary() :
|
||||
* This is an experimental API that allows for the efficient use of a
|
||||
* static dictionary many times.
|
||||
*
|
||||
* Rather than re-loading the dictionary buffer into a working context before
|
||||
* each compression, or copying a pre-loaded dictionary's LZ4_streamHC_t into a
|
||||
* working LZ4_streamHC_t, this function introduces a no-copy setup mechanism,
|
||||
* in which the working stream references the dictionary stream in-place.
|
||||
*
|
||||
* Several assumptions are made about the state of the dictionary stream.
|
||||
* Currently, only streams which have been prepared by LZ4_loadDictHC() should
|
||||
* be expected to work.
|
||||
*
|
||||
* Alternatively, the provided dictionary stream pointer may be NULL, in which
|
||||
* case any existing dictionary stream is unset.
|
||||
*
|
||||
* A dictionary should only be attached to a stream without any history (i.e.,
|
||||
* a stream that has just been reset).
|
||||
*
|
||||
* The dictionary will remain attached to the working stream only for the
|
||||
* current stream session. Calls to LZ4_resetStreamHC(_fast) will remove the
|
||||
* dictionary context association from the working stream. The dictionary
|
||||
* stream (and source buffer) must remain in-place / accessible / unchanged
|
||||
* through the lifetime of the stream session.
|
||||
*/
|
||||
LZ4LIB_STATIC_API void LZ4_attach_HC_dictionary(
|
||||
LZ4_streamHC_t *working_stream,
|
||||
const LZ4_streamHC_t *dictionary_stream);
|
||||
|
||||
#if defined (__cplusplus)
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* LZ4_HC_SLO_098092834 */
|
||||
#endif /* LZ4_HC_STATIC_LINKING_ONLY */
|
||||
|
||||
@ -35,7 +35,7 @@ Lz4CompressStream::Lz4CompressStream(OutputStream * stream, uint32_t bufferSizeH
|
||||
|
||||
void Lz4CompressStream::compressOneBlock(const void * buff, uint32_t length) {
|
||||
size_t compressedLength = _tempBufferSize - 8;
|
||||
int ret = LZ4_compress((char*)buff, _tempBuffer + 8, length);
|
||||
int ret = LZ4_compress_default((char*)buff, _tempBuffer + 8, length, LZ4_compressBound(length));
|
||||
if (ret > 0) {
|
||||
compressedLength = ret;
|
||||
((uint32_t*)_tempBuffer)[0] = bswap(length);
|
||||
|
||||
@ -185,7 +185,7 @@ void MeasureSingleFileLz4(const string & path, CompressResult & total, size_t bl
|
||||
size_t currentblocksize = std::min(data.length() - start, blockSize);
|
||||
uint64_t startTime = t.now();
|
||||
for (int i = 0; i < times; i++) {
|
||||
int osize = LZ4_compress((char*)data.data() + start, outputBuffer, currentblocksize);
|
||||
int osize = LZ4_compress_default((char*)data.data() + start, outputBuffer, currentblocksize, LZ4_compressBound(currentblocksize));
|
||||
result.compressedSize += osize;
|
||||
result.uncompressedSize += currentblocksize;
|
||||
}
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
LZ4 - Fast LZ compression algorithm
|
||||
Header File
|
||||
Copyright (C) 2011-2014, Yann Collet.
|
||||
Copyright (C) 2011-present, 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
|
||||
@ -27,5 +27,5 @@
|
||||
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 public forum : https://groups.google.com/forum/#!forum/lz4c
|
||||
- LZ4 homepage : http://www.lz4.org
|
||||
- LZ4 source repository : https://github.com/lz4/lz4
|
||||
|
||||
Loading…
Reference in New Issue
Block a user