kopia lustrzana https://github.com/f4exb/sdrangel
361 wiersze
18 KiB
C
361 wiersze
18 KiB
C
/*
|
|
LZ4 - Fast LZ compression algorithm
|
|
Header File
|
|
Copyright (C) 2011-2015, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- LZ4 source repository : https://github.com/Cyan4973/lz4
|
|
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
|
|
*/
|
|
#pragma once
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* lz4.h provides block compression functions, and gives full buffer control to programmer.
|
|
* If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
|
|
* and can let the library handle its own memory, please use lz4frame.h instead.
|
|
*/
|
|
|
|
/**************************************
|
|
* Version
|
|
**************************************/
|
|
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
|
|
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
|
|
#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
|
|
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
|
|
int LZ4_versionNumber (void);
|
|
|
|
/**************************************
|
|
* Tuning parameter
|
|
**************************************/
|
|
/*
|
|
* LZ4_MEMORY_USAGE :
|
|
* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
|
|
* Increasing memory usage improves compression ratio
|
|
* Reduced memory usage can improve speed, due to cache effect
|
|
* Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
|
|
*/
|
|
#define LZ4_MEMORY_USAGE 14
|
|
|
|
|
|
/**************************************
|
|
* Simple Functions
|
|
**************************************/
|
|
|
|
int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
|
|
int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
|
|
|
|
/*
|
|
LZ4_compress_default() :
|
|
Compresses 'sourceSize' bytes from buffer 'source'
|
|
into already allocated 'dest' buffer of size 'maxDestSize'.
|
|
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
|
|
It also runs faster, so it's a recommended setting.
|
|
If the function cannot compress 'source' into a more limited 'dest' budget,
|
|
compression stops *immediately*, and the function result is zero.
|
|
As a consequence, 'dest' content is not valid.
|
|
This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
|
|
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
|
|
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
|
|
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
|
|
or 0 if compression fails
|
|
|
|
LZ4_decompress_safe() :
|
|
compressedSize : is the precise full size of the compressed block.
|
|
maxDecompressedSize : is the size of destination buffer, which must be already allocated.
|
|
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
|
|
If destination buffer is not large enough, decoding will stop and output an error code (<0).
|
|
If the source stream is detected malformed, the function will stop decoding and return a negative result.
|
|
This function is protected against buffer overflow exploits, including malicious data packets.
|
|
It never writes outside output buffer, nor reads outside input buffer.
|
|
*/
|
|
|
|
|
|
/**************************************
|
|
* Advanced Functions
|
|
**************************************/
|
|
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
|
|
#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
|
|
|
|
/*
|
|
LZ4_compressBound() :
|
|
Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
|
|
This function is primarily useful for memory allocation purposes (destination buffer size).
|
|
Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
|
|
Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
|
|
inputSize : max supported value is LZ4_MAX_INPUT_SIZE
|
|
return : maximum output size in a "worst case" scenario
|
|
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
|
|
*/
|
|
int LZ4_compressBound(int inputSize);
|
|
|
|
/*
|
|
LZ4_compress_fast() :
|
|
Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
|
|
The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
|
|
It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
|
|
An acceleration value of "1" is the same as regular LZ4_compress_default()
|
|
Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
|
|
*/
|
|
int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
|
|
|
|
|
|
/*
|
|
LZ4_compress_fast_extState() :
|
|
Same compression function, just using an externally allocated memory space to store compression state.
|
|
Use LZ4_sizeofState() to know how much memory must be allocated,
|
|
and allocate it on 8-bytes boundaries (using malloc() typically).
|
|
Then, provide it as 'void* state' to compression function.
|
|
*/
|
|
int LZ4_sizeofState(void);
|
|
int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
|
|
|
|
|
|
/*
|
|
LZ4_compress_destSize() :
|
|
Reverse the logic, by compressing as much data as possible from 'source' buffer
|
|
into already allocated buffer 'dest' of size 'targetDestSize'.
|
|
This function either compresses the entire 'source' content into 'dest' if it's large enough,
|
|
or fill 'dest' buffer completely with as much data as possible from 'source'.
|
|
*sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
|
|
New value is necessarily <= old value.
|
|
return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
|
|
or 0 if compression fails
|
|
*/
|
|
int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
|
|
|
|
|
|
/*
|
|
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() :
|
|
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);
|
|
|
|
|
|
/***********************************************
|
|
* Streaming Compression Functions
|
|
***********************************************/
|
|
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
|
|
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
|
|
/*
|
|
* LZ4_stream_t
|
|
* information structure to track an LZ4 stream.
|
|
* important : init this structure content before first use !
|
|
* note : only allocated directly the structure if you are statically linking LZ4
|
|
* If you are using liblz4 as a DLL, please use below construction methods instead.
|
|
*/
|
|
typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
|
|
|
|
/*
|
|
* LZ4_resetStream
|
|
* Use this function to init an allocated LZ4_stream_t structure
|
|
*/
|
|
void LZ4_resetStream (LZ4_stream_t* streamPtr);
|
|
|
|
/*
|
|
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
|
|
* LZ4_freeStream releases its memory.
|
|
* In the context of a DLL (liblz4), please use these methods rather than the static struct.
|
|
* They are more future proof, in case of a change of LZ4_stream_t size.
|
|
*/
|
|
LZ4_stream_t* LZ4_createStream(void);
|
|
int LZ4_freeStream (LZ4_stream_t* streamPtr);
|
|
|
|
/*
|
|
* LZ4_loadDict
|
|
* Use this function to load a static dictionary into LZ4_stream.
|
|
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
|
|
* Loading a size of 0 is allowed.
|
|
* Return : dictionary size, in bytes (necessarily <= 64 KB)
|
|
*/
|
|
int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
|
|
|
|
/*
|
|
* LZ4_compress_fast_continue
|
|
* Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
|
|
* Important : Previous data blocks are assumed to still be present and unmodified !
|
|
* 'dst' buffer must be already allocated.
|
|
* If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
|
|
* If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
|
|
*/
|
|
int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
|
|
|
|
/*
|
|
* LZ4_saveDict
|
|
* If previously compressed data block is not guaranteed to remain available at its memory location
|
|
* save it into a safer place (char* safeBuffer)
|
|
* Note : you don't need to call LZ4_loadDict() afterwards,
|
|
* dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue()
|
|
* Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error
|
|
*/
|
|
int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
|
|
|
|
|
|
/************************************************
|
|
* Streaming Decompression Functions
|
|
************************************************/
|
|
|
|
#define LZ4_STREAMDECODESIZE_U64 4
|
|
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
|
|
typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
|
|
/*
|
|
* LZ4_streamDecode_t
|
|
* information structure to track an LZ4 stream.
|
|
* init this structure content using LZ4_setStreamDecode or memset() before first use !
|
|
*
|
|
* In the context of a DLL (liblz4) please prefer usage of construction methods below.
|
|
* They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
|
|
* LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
|
|
* LZ4_freeStreamDecode releases its memory.
|
|
*/
|
|
LZ4_streamDecode_t* LZ4_createStreamDecode(void);
|
|
int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
|
|
|
|
/*
|
|
* LZ4_setStreamDecode
|
|
* Use this function to instruct where to find the dictionary.
|
|
* Setting a size of 0 is allowed (same effect as reset).
|
|
* Return : 1 if OK, 0 if error
|
|
*/
|
|
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
|
|
|
|
/*
|
|
*_continue() :
|
|
These decoding functions allow decompression of multiple blocks in "streaming" mode.
|
|
Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
|
|
In the case of a ring buffers, decoding buffer must be either :
|
|
- Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
|
|
In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
|
|
- Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
|
|
maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
|
|
In which case, encoding and decoding buffers do not need to be synchronized,
|
|
and encoding ring buffer can have any size, including small ones ( < 64 KB).
|
|
- _At least_ 64 KB + 8 bytes + maxBlockSize.
|
|
In which case, encoding and decoding buffers do not need to be synchronized,
|
|
and encoding ring buffer can have any size, including larger than decoding buffer.
|
|
Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
|
|
and indicate where it is saved using LZ4_setStreamDecode()
|
|
*/
|
|
int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
|
|
int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
|
|
|
|
|
|
/*
|
|
Advanced decoding functions :
|
|
*_usingDict() :
|
|
These decoding functions work the same as
|
|
a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
|
|
They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
|
|
*/
|
|
int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
|
|
int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
|
|
|
|
|
|
|
|
/**************************************
|
|
* Obsolete Functions
|
|
**************************************/
|
|
/* Deprecate Warnings */
|
|
/* Should these warnings messages be a problem,
|
|
it is generally possible to disable them,
|
|
with -Wno-deprecated-declarations for gcc
|
|
or _CRT_SECURE_NO_WARNINGS in Visual for example.
|
|
You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
|
|
#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
|
|
# define LZ4_DEPRECATE_WARNING_DEFBLOCK
|
|
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
|
|
# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
|
|
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
|
|
# elif (LZ4_GCC_VERSION >= 301)
|
|
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
|
|
# elif defined(_MSC_VER)
|
|
# define LZ4_DEPRECATED(message) __declspec(deprecated(message))
|
|
# else
|
|
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
|
|
# define LZ4_DEPRECATED(message)
|
|
# endif
|
|
#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
|
|
|
|
/* Obsolete compression functions */
|
|
/* These functions are planned to start generate warnings by r131 approximately */
|
|
int LZ4_compress (const char* source, char* dest, int sourceSize);
|
|
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
|
|
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
|
|
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
|
int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
|
|
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
|
|
|
/* Obsolete decompression functions */
|
|
/* These function names are completely deprecated and must no longer be used.
|
|
They are only provided here for compatibility with older programs.
|
|
- LZ4_uncompress is the same as LZ4_decompress_fast
|
|
- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
|
|
These function prototypes are now disabled; uncomment them only if you really need them.
|
|
It is highly recommended to stop using these prototypes and migrate to maintained ones */
|
|
/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
|
|
/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
|
|
|
|
/* Obsolete streaming functions; use new streaming interface whenever possible */
|
|
LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
|
|
LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
|
|
LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
|
|
LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
|
|
|
|
/* Obsolete streaming decoding functions */
|
|
LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
|
|
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|