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update lz4 to version 1.8.3

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Tino Reichardt
2018-10-21 12:55:39 +02:00
parent a42c9c1c77
commit e69385e597
9 changed files with 2727 additions and 1585 deletions
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56
C/lz4/README.md
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@@ -1,44 +1,43 @@
LZ4 - Library Files
================================
The directory contains many files, but depending on project's objectives,
The `/lib` directory contains many files, but depending on project's objectives,
not all of them are necessary.
#### Minimal LZ4 build
The minimum required is **`lz4.c`** and **`lz4.h`**,
which will provide the fast compression and decompression algorithm.
which provides the fast compression and decompression algorithm.
They generate and decode data using [LZ4 block format].
#### The High Compression variant of LZ4
#### High Compression variant
For more compression at the cost of compression speed,
the High Compression variant **lz4hc** is available.
It's necessary to add **`lz4hc.c`** and **`lz4hc.h`**.
The variant still depends on regular `lz4` source files.
In particular, the decompression is still provided by `lz4.c`.
For more compression ratio at the cost of compression speed,
the High Compression variant called **lz4hc** is available.
Add files **`lz4hc.c`** and **`lz4hc.h`**.
The variant still depends on regular `lib/lz4.*` source files.
#### Compatibility issues
#### Frame variant, for interoperability
In order to produce files or streams compatible with `lz4` command line utility,
In order to produce compressed data compatible with `lz4` command line utility,
it's necessary to encode lz4-compressed blocks using the [official interoperable frame format].
This format is generated and decoded automatically by the **lz4frame** library.
In order to work properly, lz4frame needs lz4 and lz4hc, and also **xxhash**,
which provides error detection.
(_Advanced stuff_ : It's possible to hide xxhash symbols into a local namespace.
This is what `liblz4` does, to avoid symbol duplication
in case a user program would link to several libraries containing xxhash symbols.)
Its public API is described in `lib/lz4frame.h`.
In order to work properly, lz4frame needs all other modules present in `/lib`,
including, lz4 and lz4hc, and also **xxhash**.
So it's necessary to include all `*.c` and `*.h` files present in `/lib`.
#### Advanced API
#### Advanced / Experimental API
A more complex `lz4frame_static.h` is also provided.
It contains definitions which are not guaranteed to remain stable within future versions.
It must be used with static linking ***only***.
A complex API defined in `lz4frame_static.h` contains definitions
which are not guaranteed to remain stable in future versions.
As a consequence, it must be used with static linking ***only***.
#### Using MinGW+MSYS to create DLL
#### Windows : using MinGW+MSYS to create DLL
DLL can be created using MinGW+MSYS with the `make liblz4` command.
This command creates `dll\liblz4.dll` and the import library `dll\liblz4.lib`.
@@ -51,23 +50,24 @@ file it should be linked with `dll\liblz4.dll`. For example:
```
gcc $(CFLAGS) -Iinclude/ test-dll.c -o test-dll dll\liblz4.dll
```
The compiled executable will require LZ4 DLL which is available at `dll\liblz4.dll`.
The compiled executable will require LZ4 DLL which is available at `dll\liblz4.dll`.
#### Miscellaneous
#### Miscellaneous
Other files present in the directory are not source code. There are :
- LICENSE : contains the BSD license text
- Makefile : script to compile or install lz4 library (static or dynamic)
- liblz4.pc.in : for pkg-config (make install)
- README.md : this file
- `LICENSE` : contains the BSD license text
- `Makefile` : `make` script to compile and install lz4 library (static and dynamic)
- `liblz4.pc.in` : for `pkg-config` (used in `make install`)
- `README.md` : this file
[official interoperable frame format]: ../doc/lz4_Frame_format.md
[LZ4 block format]: ../doc/lz4_Block_format.md
#### License
#### License
All source material within __lib__ directory are BSD 2-Clause licensed.
See [LICENSE](LICENSE) for details.
The license is also repeated at the top of each source file.
The license is also reminded at the top of each source file.

1451
C/lz4/lz4.c
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440
C/lz4/lz4.h
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@@ -1,7 +1,7 @@
/*
* LZ4 - Fast LZ compression algorithm
* Header File
* Copyright (C) 2011-2017, Yann Collet.
* Copyright (C) 2011-present, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@@ -46,7 +46,7 @@ extern "C" {
/**
Introduction
LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
LZ4 is lossless compression algorithm, providing compression speed at 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.
@@ -62,8 +62,8 @@ extern "C" {
An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
take care of encoding standard metadata alongside LZ4-compressed blocks.
If your application requires interoperability, it's recommended to use it.
A library is provided to take care of it, see lz4frame.h.
Frame format is required for interoperability.
It is delivered through a companion API, declared in lz4frame.h.
*/
/*^***************************************************************
@@ -72,24 +72,28 @@ extern "C" {
/*
* LZ4_DLL_EXPORT :
* Enable exporting of functions when building a Windows DLL
* LZ4LIB_API :
* LZ4LIB_VISIBILITY :
* Control library symbols visibility.
*/
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
# define LZ4LIB_API __declspec(dllexport)
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
# define LZ4LIB_API __declspec(dllimport) /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
#elif defined(__GNUC__) && (__GNUC__ >= 4)
# define LZ4LIB_API __attribute__ ((__visibility__ ("default")))
#else
# define LZ4LIB_API
#ifndef LZ4LIB_VISIBILITY
# if defined(__GNUC__) && (__GNUC__ >= 4)
# define LZ4LIB_VISIBILITY __attribute__ ((visibility ("default")))
# else
# define LZ4LIB_VISIBILITY
# endif
#endif
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
# define LZ4LIB_API __declspec(dllexport) LZ4LIB_VISIBILITY
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
# define LZ4LIB_API __declspec(dllimport) LZ4LIB_VISIBILITY /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
#else
# define LZ4LIB_API LZ4LIB_VISIBILITY
#endif
/*------ Version ------*/
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
#define LZ4_VERSION_MINOR 8 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE 0 /* for tweaks, bug-fixes, or development */
#define LZ4_VERSION_RELEASE 3 /* for tweaks, bug-fixes, or development */
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
@@ -98,8 +102,8 @@ extern "C" {
#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
LZ4LIB_API int LZ4_versionNumber (void); /**< library version number; to be used when checking dll version */
LZ4LIB_API const char* LZ4_versionString (void); /**< library version string; to be used when checking dll version */
LZ4LIB_API int LZ4_versionNumber (void); /**< library version number; useful to check dll version */
LZ4LIB_API const char* LZ4_versionString (void); /**< library version string; unseful to check dll version */
/*-************************************
@@ -109,7 +113,7 @@ LZ4LIB_API const char* LZ4_versionString (void); /**< library version string;
* 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
* Reduced memory usage may improve speed, thanks to cache effect
* Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
*/
#ifndef LZ4_MEMORY_USAGE
@@ -120,30 +124,29 @@ LZ4LIB_API const char* LZ4_versionString (void); /**< library version string;
* Simple Functions
**************************************/
/*! 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).
Compresses 'srcSize' bytes from buffer 'src'
into already allocated 'dst' buffer of size 'dstCapacity'.
Compression is guaranteed to succeed if 'dstCapacity' >= LZ4_compressBound(srcSize).
It also runs faster, so it's a recommended setting.
If the function cannot compress 'source' into a more limited 'dest' budget,
If the function cannot compress 'src' into a more limited 'dst' budget,
compression stops *immediately*, and the function result is zero.
As a consequence, 'dest' content is not valid.
This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
or 0 if compression fails */
LZ4LIB_API int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
Note : as a consequence, 'dst' content is not valid.
Note 2 : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
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 */
LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
/*! LZ4_decompress_safe() :
compressedSize : is the precise full size of the compressed block.
maxDecompressedSize : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
If destination buffer is not large enough, decoding will stop and output an error code (<0).
compressedSize : is the exact complete size of the compressed block.
dstCapacity : is the size of destination buffer, which must be already allocated.
return : the number of bytes decompressed into destination buffer (necessarily <= dstCapacity)
If destination buffer is not large enough, decoding will stop and output an error code (negative value).
If the source stream is detected malformed, the function will stop decoding and return a negative result.
This function is protected against buffer overflow exploits, including malicious data packets.
It never writes outside output buffer, nor reads outside input buffer.
This function is protected against malicious data packets.
*/
LZ4LIB_API int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
/*-************************************
@@ -157,22 +160,22 @@ 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)
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)
*/
LZ4LIB_API int LZ4_compressBound(int inputSize);
/*!
LZ4_compress_fast() :
Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
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 (see lz4.c), which is 1.
Values <= 0 will be replaced by ACCELERATION_DEFAULT (currently == 1, see lz4.c).
*/
LZ4LIB_API int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
LZ4LIB_API int LZ4_compress_fast (const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*!
@@ -180,58 +183,79 @@ 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.
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* source, char* dest, int inputSize, int maxDestSize, int acceleration);
LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*!
LZ4_compress_destSize() :
Reverse the logic, by compressing as much data as possible from 'source' buffer
into already allocated buffer 'dest' of size 'targetDestSize'.
This function either compresses the entire 'source' content into 'dest' if it's large enough,
or fill 'dest' buffer completely with as much data as possible from 'source'.
*sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
New value is necessarily <= old value.
return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
or 0 if compression fails
/*! 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.
*/
LZ4LIB_API int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
LZ4LIB_API int LZ4_compress_destSize (const char* src, char* dst, int* srcSizePtr, int targetDstSize);
/*!
LZ4_decompress_fast() :
originalSize : is the original and therefore uncompressed size
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).
*/
LZ4LIB_API int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
/*! LZ4_decompress_fast() : **unsafe!**
* This function used to be a bit faster than LZ4_decompress_safe(),
* though situation has changed in recent versions,
* and now `LZ4_decompress_safe()` can be as fast and sometimes faster than `LZ4_decompress_fast()`.
* Moreover, LZ4_decompress_fast() is not protected vs malformed input, as it doesn't perform full validation of compressed data.
* As a consequence, this function is no longer recommended, and may be deprecated in future versions.
* It's only remaining specificity is that it can decompress data without knowing its compressed size.
*
* 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).
* If the source stream is detected malformed, the function stops decoding and returns a negative result.
* note : This function requires uncompressed originalSize to be known in advance.
* The function never writes past the output buffer.
* However, since it doesn't know its 'src' size, it may read past the intended input.
* Also, because match offsets are not validated during decoding,
* reads from 'src' may underflow.
* Use this function in trusted environment **only**.
*/
LZ4LIB_API int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
/*!
LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source'
into destination buffer 'dest' of size 'maxDecompressedSize'.
The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached,
reducing decompression time.
return : the number of bytes decoded in the destination buffer (necessarily <= maxDecompressedSize)
Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
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
*/
LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);
/*! 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);
/*-*********************************************
* Streaming Compression Functions
***********************************************/
typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
/*! LZ4_createStream() and LZ4_freeStream() :
* LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
@@ -242,87 +266,219 @@ LZ4LIB_API int LZ4_freeStream (LZ4_stream_t* streamPtr);
/*! LZ4_resetStream() :
* An LZ4_stream_t structure can be allocated once and re-used multiple times.
* Use this function to init an allocated `LZ4_stream_t` structure and start a new compression.
* Use this function to start compressing a new stream.
*/
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
/*! LZ4_loadDict() :
* Use this function to load a static dictionary into LZ4_stream.
* Use this function to load a static dictionary into LZ4_stream_t.
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed.
* Return : dictionary size, in bytes (necessarily <= 64 KB)
* Loading a size of 0 is allowed, and is the same as reset.
* @return : dictionary size, in bytes (necessarily <= 64 KB)
*/
LZ4LIB_API 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 remain present and unmodified !
* 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.
* If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function @return==0.
* After an error, the stream status is invalid, it can only be reset or freed.
*
* @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.
* It's not possible to append blocks together and expect a single invocation of LZ4_decompress_*() to decompress them together.
* Each block must be decompressed separately, calling LZ4_decompress_*() with associated metadata.
*
* 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 invalid, it can only be reset or freed.
*/
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
/*! LZ4_saveDict() :
* If previously compressed data block is not guaranteed to remain available at its current memory location,
* If last 64KB data cannot be guaranteed to remain available at its current memory location,
* save it into a safer place (char* safeBuffer).
* Note : it's not necessary to call LZ4_loadDict() after LZ4_saveDict(), dictionary is immediately usable.
* @return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
* 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.
*/
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
/*-**********************************************
* Streaming Decompression Functions
* Bufferless synchronous API
************************************************/
typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* incomplete type (defined later) */
typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* tracking context */
/*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
* creation / destruction of streaming decompression tracking structure */
* 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() :
* 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
* 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(mbs) (65536 + 14 + (mbs)) /* for static allocation; mbs presumed valid */
/*! LZ4_decompress_*_continue() :
* These decoding functions allow decompression of multiple blocks in "streaming" mode.
* Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
* In the case of a ring buffers, decoding buffer must be either :
* - 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.
* 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).
* - _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()
*
* 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* source, char* dest, int compressedSize, int maxDecompressedSize);
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int srcSize, int dstCapacity);
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
/*! LZ4_decompress_*_usingDict() :
* These decoding functions work the same as
* a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
* They are stand-alone, and don't need an LZ4_streamDecode_t structure.
* Dictionary is presumed stable : it must remain accessible and unmodified during next decompression.
*/
LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* src, char* dst, int srcSize, int dstCapcity, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
/*^**********************************************
* !!!!!! STATIC LINKING ONLY !!!!!!
***********************************************/
/*-************************************
* Unstable declarations
**************************************
* Declarations in this section should be considered unstable.
* Use at your own peril, etc., etc.
* They may be removed in the future.
* Their signatures may change.
**************************************/
#ifdef LZ4_STATIC_LINKING_ONLY
/*! LZ4_resetStream_fast() :
* Use this, like LZ4_resetStream(), to prepare a context for a new chain of
* calls to a streaming API (e.g., LZ4_compress_fast_continue()).
*
* Note:
* Using this in advance of a non- streaming-compression function is redundant,
* and potentially bad for performance, since they all perform their own custom
* reset internally.
*
* Differences from LZ4_resetStream():
* When an LZ4_stream_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_resetStream()).
*
* LZ4_streams are guaranteed to be in a valid state when:
* - returned from LZ4_createStream()
* - reset by LZ4_resetStream()
* - memset(stream, 0, sizeof(LZ4_stream_t)), though this is discouraged
* - the stream was in a valid state and was reset by LZ4_resetStream_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 (e.g., LZ4_compress_fast_extState()) and
* that returned success
*
* When a stream isn't known to be in a valid state, it is not safe to pass to
* any fastReset or streaming function. It must first be cleansed by the full
* LZ4_resetStream().
*/
LZ4LIB_API void LZ4_resetStream_fast (LZ4_stream_t* streamPtr);
/*! 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_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 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_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 dictionary stream pointer 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_API void LZ4_attach_dictionary(LZ4_stream_t *working_stream, const LZ4_stream_t *dictionary_stream);
#endif
/*-************************************
* Private definitions
**************************************
@@ -337,14 +493,16 @@ LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, in
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h>
typedef struct {
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;
uint32_t initCheck;
uint16_t initCheck;
uint16_t tableType;
const uint8_t* dictionary;
uint8_t* bufferStart; /* obsolete, used for slideInputBuffer */
const LZ4_stream_t_internal* dictCtx;
uint32_t dictSize;
} LZ4_stream_t_internal;
};
typedef struct {
const uint8_t* externalDict;
@@ -355,14 +513,16 @@ typedef struct {
#else
typedef struct {
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 int initCheck;
unsigned short initCheck;
unsigned short tableType;
const unsigned char* dictionary;
unsigned char* bufferStart; /* obsolete, used for slideInputBuffer */
const LZ4_stream_t_internal* dictCtx;
unsigned int dictSize;
} LZ4_stream_t_internal;
};
typedef struct {
const unsigned char* externalDict;
@@ -434,26 +594,34 @@ union LZ4_streamDecode_u {
#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
/* Obsolete compression functions */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress (const char* source, char* dest, int sourceSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress (const char* source, char* dest, int sourceSize);
LZ4_DEPRECATED("use LZ4_compress_default() instead") LZ4LIB_API int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, 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 */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast() instead") int LZ4_uncompress (const char* source, char* dest, int outputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe() instead") int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
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; use new streaming interface whenever possible */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
/* Obsolete streaming 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 */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
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);
#endif /* LZ4_H_2983827168210 */

445
C/lz4/lz4frame.c
View File

@@ -46,11 +46,25 @@ You can contact the author at :
#endif
/*-************************************
* Tuning parameters
**************************************/
/*
* LZ4F_HEAPMODE :
* Select how default compression functions will allocate memory for their hash table,
* in memory stack (0:default, fastest), or in memory heap (1:requires malloc()).
*/
#ifndef LZ4F_HEAPMODE
# define LZ4F_HEAPMODE 0
#endif
/*-************************************
* Memory routines
**************************************/
#include <stdlib.h> /* malloc, calloc, free */
#define ALLOCATOR(s) calloc(1,s)
#define ALLOC(s) malloc(s)
#define ALLOC_AND_ZERO(s) calloc(1,s)
#define FREEMEM free
#include <string.h> /* memset, memcpy, memmove */
#define MEM_INIT memset
@@ -59,19 +73,42 @@ You can contact the author at :
/*-************************************
* Includes
**************************************/
#include "lz4frame_static.h"
#define LZ4F_STATIC_LINKING_ONLY
#include "lz4frame.h"
#define LZ4_STATIC_LINKING_ONLY
#include "lz4.h"
#define LZ4_HC_STATIC_LINKING_ONLY
#include "lz4hc.h"
#define XXH_STATIC_LINKING_ONLY
#include "../zstd/xxhash.h"
#include "xxhash.h"
/*-************************************
* Debug
**************************************/
#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=1)
# include <assert.h>
#else
# ifndef assert
# define assert(condition) ((void)0)
# endif
#endif
#define LZ4F_STATIC_ASSERT(c) { enum { LZ4F_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=2) && !defined(DEBUGLOG)
# include <stdio.h>
static int g_debuglog_enable = 1;
# define DEBUGLOG(l, ...) { \
if ((g_debuglog_enable) && (l<=LZ4_DEBUG)) { \
fprintf(stderr, __FILE__ ": "); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, " \n"); \
} }
#else
# define DEBUGLOG(l, ...) {} /* disabled */
#endif
/*-************************************
* Basic Types
@@ -180,7 +217,8 @@ typedef struct LZ4F_cctx_s
U64 totalInSize;
XXH32_state_t xxh;
void* lz4CtxPtr;
U32 lz4CtxLevel; /* 0: unallocated; 1: LZ4_stream_t; 3: LZ4_streamHC_t */
U16 lz4CtxAlloc; /* sized for: 0 = none, 1 = lz4 ctx, 2 = lz4hc ctx */
U16 lz4CtxState; /* in use as: 0 = none, 1 = lz4 ctx, 2 = lz4hc ctx */
} LZ4F_cctx_t;
@@ -271,7 +309,7 @@ static size_t LZ4F_compressBound_internal(size_t srcSize,
size_t alreadyBuffered)
{
LZ4F_preferences_t prefsNull;
memset(&prefsNull, 0, sizeof(prefsNull));
MEM_INIT(&prefsNull, 0, sizeof(prefsNull));
prefsNull.frameInfo.contentChecksumFlag = LZ4F_contentChecksumEnabled; /* worst case */
{ const LZ4F_preferences_t* const prefsPtr = (preferencesPtr==NULL) ? &prefsNull : preferencesPtr;
U32 const flush = prefsPtr->autoFlush | (srcSize==0);
@@ -281,7 +319,7 @@ static size_t LZ4F_compressBound_internal(size_t srcSize,
size_t const bufferedSize = MIN(alreadyBuffered, maxBuffered);
size_t const maxSrcSize = srcSize + bufferedSize;
unsigned const nbFullBlocks = (unsigned)(maxSrcSize / blockSize);
size_t const partialBlockSize = (srcSize - (srcSize==0)) & (blockSize-1); /* 0 => -1 == MAX => blockSize-1 */
size_t const partialBlockSize = maxSrcSize & (blockSize-1);
size_t const lastBlockSize = flush ? partialBlockSize : 0;
unsigned const nbBlocks = nbFullBlocks + (lastBlockSize>0);
@@ -300,7 +338,7 @@ size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* prefere
size_t const headerSize = maxFHSize; /* max header size, including optional fields */
if (preferencesPtr!=NULL) prefs = *preferencesPtr;
else memset(&prefs, 0, sizeof(prefs));
else MEM_INIT(&prefs, 0, sizeof(prefs));
prefs.autoFlush = 1;
return headerSize + LZ4F_compressBound_internal(srcSize, &prefs, 0);;
@@ -316,27 +354,22 @@ size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* prefere
* @return : number of bytes written into dstBuffer,
* or an error code if it fails (can be tested using LZ4F_isError())
*/
size_t LZ4F_compressFrame_usingCDict(void* dstBuffer, size_t dstCapacity,
size_t LZ4F_compressFrame_usingCDict(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const void* srcBuffer, size_t srcSize,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* preferencesPtr)
{
LZ4F_cctx_t cctxI;
LZ4_stream_t lz4ctx;
LZ4F_preferences_t prefs;
LZ4F_compressOptions_t options;
BYTE* const dstStart = (BYTE*) dstBuffer;
BYTE* dstPtr = dstStart;
BYTE* const dstEnd = dstStart + dstCapacity;
memset(&cctxI, 0, sizeof(cctxI));
cctxI.version = LZ4F_VERSION;
cctxI.maxBufferSize = 5 MB; /* mess with real buffer size to prevent dynamic allocation; works only because autoflush==1 & stableSrc==1 */
if (preferencesPtr!=NULL)
prefs = *preferencesPtr;
else
memset(&prefs, 0, sizeof(prefs));
MEM_INIT(&prefs, 0, sizeof(prefs));
if (prefs.frameInfo.contentSize != 0)
prefs.frameInfo.contentSize = (U64)srcSize; /* auto-correct content size if selected (!=0) */
@@ -345,32 +378,24 @@ size_t LZ4F_compressFrame_usingCDict(void* dstBuffer, size_t dstCapacity,
if (srcSize <= LZ4F_getBlockSize(prefs.frameInfo.blockSizeID))
prefs.frameInfo.blockMode = LZ4F_blockIndependent; /* only one block => no need for inter-block link */
if (prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
cctxI.lz4CtxPtr = &lz4ctx;
cctxI.lz4CtxLevel = 1;
} /* fast compression context pre-created on stack */
memset(&options, 0, sizeof(options));
MEM_INIT(&options, 0, sizeof(options));
options.stableSrc = 1;
if (dstCapacity < LZ4F_compressFrameBound(srcSize, &prefs)) /* condition to guarantee success */
return err0r(LZ4F_ERROR_dstMaxSize_tooSmall);
{ size_t const headerSize = LZ4F_compressBegin_usingCDict(&cctxI, dstBuffer, dstCapacity, cdict, &prefs); /* write header */
{ size_t const headerSize = LZ4F_compressBegin_usingCDict(cctx, dstBuffer, dstCapacity, cdict, &prefs); /* write header */
if (LZ4F_isError(headerSize)) return headerSize;
dstPtr += headerSize; /* header size */ }
{ size_t const cSize = LZ4F_compressUpdate(&cctxI, dstPtr, dstEnd-dstPtr, srcBuffer, srcSize, &options);
{ size_t const cSize = LZ4F_compressUpdate(cctx, dstPtr, dstEnd-dstPtr, srcBuffer, srcSize, &options);
if (LZ4F_isError(cSize)) return cSize;
dstPtr += cSize; }
{ size_t const tailSize = LZ4F_compressEnd(&cctxI, dstPtr, dstEnd-dstPtr, &options); /* flush last block, and generate suffix */
{ size_t const tailSize = LZ4F_compressEnd(cctx, dstPtr, dstEnd-dstPtr, &options); /* flush last block, and generate suffix */
if (LZ4F_isError(tailSize)) return tailSize;
dstPtr += tailSize; }
if (prefs.compressionLevel >= LZ4HC_CLEVEL_MIN) /* Ctx allocation only for lz4hc */
FREEMEM(cctxI.lz4CtxPtr);
return (dstPtr - dstStart);
}
@@ -386,9 +411,44 @@ size_t LZ4F_compressFrame(void* dstBuffer, size_t dstCapacity,
const void* srcBuffer, size_t srcSize,
const LZ4F_preferences_t* preferencesPtr)
{
return LZ4F_compressFrame_usingCDict(dstBuffer, dstCapacity,
srcBuffer, srcSize,
NULL, preferencesPtr);
size_t result;
#if (LZ4F_HEAPMODE)
LZ4F_cctx_t *cctxPtr;
result = LZ4F_createCompressionContext(&cctxPtr, LZ4F_VERSION);
if (LZ4F_isError(result)) return result;
#else
LZ4F_cctx_t cctx;
LZ4_stream_t lz4ctx;
LZ4F_cctx_t *cctxPtr = &cctx;
DEBUGLOG(4, "LZ4F_compressFrame");
MEM_INIT(&cctx, 0, sizeof(cctx));
cctx.version = LZ4F_VERSION;
cctx.maxBufferSize = 5 MB; /* mess with real buffer size to prevent dynamic allocation; works only because autoflush==1 & stableSrc==1 */
if (preferencesPtr == NULL ||
preferencesPtr->compressionLevel < LZ4HC_CLEVEL_MIN)
{
LZ4_resetStream(&lz4ctx);
cctxPtr->lz4CtxPtr = &lz4ctx;
cctxPtr->lz4CtxAlloc = 1;
cctxPtr->lz4CtxState = 1;
}
#endif
result = LZ4F_compressFrame_usingCDict(cctxPtr, dstBuffer, dstCapacity,
srcBuffer, srcSize,
NULL, preferencesPtr);
#if (LZ4F_HEAPMODE)
LZ4F_freeCompressionContext(cctxPtr);
#else
if (preferencesPtr != NULL &&
preferencesPtr->compressionLevel >= LZ4HC_CLEVEL_MIN)
{
FREEMEM(cctxPtr->lz4CtxPtr);
}
#endif
return result;
}
@@ -411,13 +471,14 @@ struct LZ4F_CDict_s {
LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize)
{
const char* dictStart = (const char*)dictBuffer;
LZ4F_CDict* cdict = (LZ4F_CDict*) malloc(sizeof(*cdict));
LZ4F_CDict* cdict = (LZ4F_CDict*) ALLOC(sizeof(*cdict));
DEBUGLOG(4, "LZ4F_createCDict");
if (!cdict) return NULL;
if (dictSize > 64 KB) {
dictStart += dictSize - 64 KB;
dictSize = 64 KB;
}
cdict->dictContent = ALLOCATOR(dictSize);
cdict->dictContent = ALLOC(dictSize);
cdict->fastCtx = LZ4_createStream();
cdict->HCCtx = LZ4_createStreamHC();
if (!cdict->dictContent || !cdict->fastCtx || !cdict->HCCtx) {
@@ -425,9 +486,8 @@ LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize)
return NULL;
}
memcpy(cdict->dictContent, dictStart, dictSize);
LZ4_resetStream(cdict->fastCtx);
LZ4_loadDict (cdict->fastCtx, (const char*)cdict->dictContent, (int)dictSize);
LZ4_resetStreamHC(cdict->HCCtx, LZ4HC_CLEVEL_DEFAULT);
LZ4_setCompressionLevel(cdict->HCCtx, LZ4HC_CLEVEL_DEFAULT);
LZ4_loadDictHC(cdict->HCCtx, (const char*)cdict->dictContent, (int)dictSize);
return cdict;
}
@@ -456,7 +516,7 @@ void LZ4F_freeCDict(LZ4F_CDict* cdict)
*/
LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_compressionContext_t* LZ4F_compressionContextPtr, unsigned version)
{
LZ4F_cctx_t* const cctxPtr = (LZ4F_cctx_t*)ALLOCATOR(sizeof(LZ4F_cctx_t));
LZ4F_cctx_t* const cctxPtr = (LZ4F_cctx_t*)ALLOC_AND_ZERO(sizeof(LZ4F_cctx_t));
if (cctxPtr==NULL) return err0r(LZ4F_ERROR_allocation_failed);
cctxPtr->version = version;
@@ -482,6 +542,36 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_compressionContext_t LZ4F_comp
}
/**
* This function prepares the internal LZ4(HC) stream for a new compression,
* resetting the context and attaching the dictionary, if there is one.
*
* It needs to be called at the beginning of each independent compression
* stream (i.e., at the beginning of a frame in blockLinked mode, or at the
* beginning of each block in blockIndependent mode).
*/
static void LZ4F_initStream(void* ctx,
const LZ4F_CDict* cdict,
int level,
LZ4F_blockMode_t blockMode) {
if (level < LZ4HC_CLEVEL_MIN) {
if (cdict != NULL || blockMode == LZ4F_blockLinked) {
/* In these cases, we will call LZ4_compress_fast_continue(),
* which needs an already reset context. Otherwise, we'll call a
* one-shot API. The non-continued APIs internally perform their own
* resets at the beginning of their calls, where they know what
* tableType they need the context to be in. So in that case this
* would be misguided / wasted work. */
LZ4_resetStream_fast((LZ4_stream_t*)ctx);
}
LZ4_attach_dictionary((LZ4_stream_t *)ctx, cdict ? cdict->fastCtx : NULL);
} else {
LZ4_resetStreamHC_fast((LZ4_streamHC_t*)ctx, level);
LZ4_attach_HC_dictionary((LZ4_streamHC_t *)ctx, cdict ? cdict->HCCtx : NULL);
}
}
/*! LZ4F_compressBegin_usingCDict() :
* init streaming compression and writes frame header into dstBuffer.
* dstBuffer must be >= LZ4F_HEADER_SIZE_MAX bytes.
@@ -499,21 +589,33 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctxPtr,
BYTE* headerStart;
if (dstCapacity < maxFHSize) return err0r(LZ4F_ERROR_dstMaxSize_tooSmall);
memset(&prefNull, 0, sizeof(prefNull));
MEM_INIT(&prefNull, 0, sizeof(prefNull));
if (preferencesPtr == NULL) preferencesPtr = &prefNull;
cctxPtr->prefs = *preferencesPtr;
/* Ctx Management */
{ U32 const tableID = (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) ? 1 : 2; /* 0:nothing ; 1:LZ4 table ; 2:HC tables */
if (cctxPtr->lz4CtxLevel < tableID) {
{ U16 const ctxTypeID = (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) ? 1 : 2;
if (cctxPtr->lz4CtxAlloc < ctxTypeID) {
FREEMEM(cctxPtr->lz4CtxPtr);
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN)
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
cctxPtr->lz4CtxPtr = (void*)LZ4_createStream();
else
} else {
cctxPtr->lz4CtxPtr = (void*)LZ4_createStreamHC();
}
if (cctxPtr->lz4CtxPtr == NULL) return err0r(LZ4F_ERROR_allocation_failed);
cctxPtr->lz4CtxLevel = tableID;
} }
cctxPtr->lz4CtxAlloc = ctxTypeID;
cctxPtr->lz4CtxState = ctxTypeID;
} else if (cctxPtr->lz4CtxState != ctxTypeID) {
/* otherwise, a sufficient buffer is allocated, but we need to
* reset it to the correct context type */
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
LZ4_resetStream((LZ4_stream_t *) cctxPtr->lz4CtxPtr);
} else {
LZ4_resetStreamHC((LZ4_streamHC_t *) cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel);
}
cctxPtr->lz4CtxState = ctxTypeID;
}
}
/* Buffer Management */
if (cctxPtr->prefs.frameInfo.blockSizeID == 0)
@@ -527,7 +629,7 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctxPtr,
if (cctxPtr->maxBufferSize < requiredBuffSize) {
cctxPtr->maxBufferSize = 0;
FREEMEM(cctxPtr->tmpBuff);
cctxPtr->tmpBuff = (BYTE*)ALLOCATOR(requiredBuffSize);
cctxPtr->tmpBuff = (BYTE*)ALLOC_AND_ZERO(requiredBuffSize);
if (cctxPtr->tmpBuff == NULL) return err0r(LZ4F_ERROR_allocation_failed);
cctxPtr->maxBufferSize = requiredBuffSize;
} }
@@ -539,19 +641,10 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctxPtr,
cctxPtr->cdict = cdict;
if (cctxPtr->prefs.frameInfo.blockMode == LZ4F_blockLinked) {
/* frame init only for blockLinked : blockIndependent will be init at each block */
if (cdict) {
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN) {
memcpy(cctxPtr->lz4CtxPtr, cdict->fastCtx, sizeof(*cdict->fastCtx));
} else {
memcpy(cctxPtr->lz4CtxPtr, cdict->HCCtx, sizeof(*cdict->HCCtx));
LZ4_setCompressionLevel((LZ4_streamHC_t*)cctxPtr->lz4CtxPtr, cctxPtr->prefs.compressionLevel);
}
} else {
if (cctxPtr->prefs.compressionLevel < LZ4HC_CLEVEL_MIN)
LZ4_resetStream((LZ4_stream_t*)(cctxPtr->lz4CtxPtr));
else
LZ4_resetStreamHC((LZ4_streamHC_t*)(cctxPtr->lz4CtxPtr), cctxPtr->prefs.compressionLevel);
}
LZ4F_initStream(cctxPtr->lz4CtxPtr, cdict, cctxPtr->prefs.compressionLevel, LZ4F_blockLinked);
}
if (preferencesPtr->compressionLevel >= LZ4HC_CLEVEL_MIN) {
LZ4_favorDecompressionSpeed((LZ4_streamHC_t*)cctxPtr->lz4CtxPtr, (int)preferencesPtr->favorDecSpeed);
}
/* Magic Number */
@@ -604,10 +697,10 @@ size_t LZ4F_compressBegin(LZ4F_cctx* cctxPtr,
}
/* LZ4F_compressBound() :
* @ return size of Dst buffer given a srcSize to handle worst case situations.
* The LZ4F_frameInfo_t structure is optional : if NULL, preferences will be set to cover worst case situations.
* This function cannot fail.
/* LZ4F_compressBound() :
* @return minimum capacity of dstBuffer for a given srcSize to handle worst case scenario.
* LZ4F_preferences_t structure is optional : if NULL, preferences will be set to cover worst case scenario.
* This function cannot fail.
*/
size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr)
{
@@ -645,29 +738,29 @@ static size_t LZ4F_makeBlock(void* dst, const void* src, size_t srcSize,
static int LZ4F_compressBlock(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
{
int const acceleration = (level < -1) ? -level : 1;
int const acceleration = (level < 0) ? -level + 1 : 1;
LZ4F_initStream(ctx, cdict, level, LZ4F_blockIndependent);
if (cdict) {
memcpy(ctx, cdict->fastCtx, sizeof(*cdict->fastCtx));
return LZ4_compress_fast_continue((LZ4_stream_t*)ctx, src, dst, srcSize, dstCapacity, acceleration);
} else {
return LZ4_compress_fast_extState_fastReset(ctx, src, dst, srcSize, dstCapacity, acceleration);
}
return LZ4_compress_fast_extState(ctx, src, dst, srcSize, dstCapacity, acceleration);
}
static int LZ4F_compressBlock_continue(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
{
int const acceleration = (level < -1) ? -level : 1;
int const acceleration = (level < 0) ? -level + 1 : 1;
(void)cdict; /* init once at beginning of frame */
return LZ4_compress_fast_continue((LZ4_stream_t*)ctx, src, dst, srcSize, dstCapacity, acceleration);
}
static int LZ4F_compressBlockHC(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
{
LZ4F_initStream(ctx, cdict, level, LZ4F_blockIndependent);
if (cdict) {
memcpy(ctx, cdict->HCCtx, sizeof(*cdict->HCCtx));
LZ4_setCompressionLevel((LZ4_streamHC_t*)ctx, level);
return LZ4_compress_HC_continue((LZ4_streamHC_t*)ctx, src, dst, srcSize, dstCapacity);
}
return LZ4_compress_HC_extStateHC(ctx, src, dst, srcSize, dstCapacity, level);
return LZ4_compress_HC_extStateHC_fastReset(ctx, src, dst, srcSize, dstCapacity, level);
}
static int LZ4F_compressBlockHC_continue(void* ctx, const char* src, char* dst, int srcSize, int dstCapacity, int level, const LZ4F_CDict* cdict)
@@ -716,10 +809,12 @@ size_t LZ4F_compressUpdate(LZ4F_cctx* cctxPtr,
LZ4F_lastBlockStatus lastBlockCompressed = notDone;
compressFunc_t const compress = LZ4F_selectCompression(cctxPtr->prefs.frameInfo.blockMode, cctxPtr->prefs.compressionLevel);
DEBUGLOG(4, "LZ4F_compressUpdate (srcSize=%zu)", srcSize);
if (cctxPtr->cStage != 1) return err0r(LZ4F_ERROR_GENERIC);
if (dstCapacity < LZ4F_compressBound_internal(srcSize, &(cctxPtr->prefs), cctxPtr->tmpInSize)) return err0r(LZ4F_ERROR_dstMaxSize_tooSmall);
memset(&cOptionsNull, 0, sizeof(cOptionsNull));
if (dstCapacity < LZ4F_compressBound_internal(srcSize, &(cctxPtr->prefs), cctxPtr->tmpInSize))
return err0r(LZ4F_ERROR_dstMaxSize_tooSmall);
MEM_INIT(&cOptionsNull, 0, sizeof(cOptionsNull));
if (compressOptionsPtr == NULL) compressOptionsPtr = &cOptionsNull;
/* complete tmp buffer */
@@ -887,8 +982,7 @@ typedef enum {
dstage_getBlockHeader, dstage_storeBlockHeader,
dstage_copyDirect, dstage_getBlockChecksum,
dstage_getCBlock, dstage_storeCBlock,
dstage_decodeCBlock, dstage_decodeCBlock_intoDst,
dstage_decodeCBlock_intoTmp, dstage_flushOut,
dstage_flushOut,
dstage_getSuffix, dstage_storeSuffix,
dstage_getSFrameSize, dstage_storeSFrameSize,
dstage_skipSkippable
@@ -924,7 +1018,7 @@ struct LZ4F_dctx_s {
*/
LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_dctx** LZ4F_decompressionContextPtr, unsigned versionNumber)
{
LZ4F_dctx* const dctx = (LZ4F_dctx*)ALLOCATOR(sizeof(LZ4F_dctx));
LZ4F_dctx* const dctx = (LZ4F_dctx*)ALLOC_AND_ZERO(sizeof(LZ4F_dctx));
if (dctx==NULL) return err0r(LZ4F_ERROR_GENERIC);
dctx->version = versionNumber;
@@ -996,7 +1090,7 @@ static size_t LZ4F_decodeHeader(LZ4F_dctx* dctx, const void* src, size_t srcSize
/* need to decode header to get frameInfo */
if (srcSize < minFHSize) return err0r(LZ4F_ERROR_frameHeader_incomplete); /* minimal frame header size */
memset(&(dctx->frameInfo), 0, sizeof(dctx->frameInfo));
MEM_INIT(&(dctx->frameInfo), 0, sizeof(dctx->frameInfo));
/* special case : skippable frames */
if ((LZ4F_readLE32(srcPtr) & 0xFFFFFFF0U) == LZ4F_MAGIC_SKIPPABLE_START) {
@@ -1129,24 +1223,31 @@ LZ4F_errorCode_t LZ4F_getFrameInfo(LZ4F_dctx* dctx, LZ4F_frameInfo_t* frameInfoP
/* LZ4F_updateDict() :
* only used for LZ4F_blockLinked mode */
static void LZ4F_updateDict(LZ4F_dctx* dctx, const BYTE* dstPtr, size_t dstSize, const BYTE* dstPtr0, unsigned withinTmp)
static void LZ4F_updateDict(LZ4F_dctx* dctx,
const BYTE* dstPtr, size_t dstSize, const BYTE* dstBufferStart,
unsigned withinTmp)
{
if (dctx->dictSize==0)
dctx->dict = (const BYTE*)dstPtr; /* priority to dictionary continuity */
if (dctx->dict + dctx->dictSize == dstPtr) { /* dictionary continuity */
if (dctx->dict + dctx->dictSize == dstPtr) { /* dictionary continuity, directly within dstBuffer */
dctx->dictSize += dstSize;
return;
}
if (dstPtr - dstPtr0 + dstSize >= 64 KB) { /* dstBuffer large enough to become dictionary */
dctx->dict = (const BYTE*)dstPtr0;
dctx->dictSize = dstPtr - dstPtr0 + dstSize;
if (dstPtr - dstBufferStart + dstSize >= 64 KB) { /* history in dstBuffer becomes large enough to become dictionary */
dctx->dict = (const BYTE*)dstBufferStart;
dctx->dictSize = dstPtr - dstBufferStart + dstSize;
return;
}
if ((withinTmp) && (dctx->dict == dctx->tmpOutBuffer)) {
/* assumption : dctx->dict + dctx->dictSize == dctx->tmpOut + dctx->tmpOutStart */
assert(dstSize < 64 KB); /* if dstSize >= 64 KB, dictionary would be set into dstBuffer directly */
/* dstBuffer does not contain whole useful history (64 KB), so it must be saved within tmpOut */
if ((withinTmp) && (dctx->dict == dctx->tmpOutBuffer)) { /* continue history within tmpOutBuffer */
/* withinTmp expectation : content of [dstPtr,dstSize] is same as [dict+dictSize,dstSize], so we just extend it */
assert(dctx->dict + dctx->dictSize == dctx->tmpOut + dctx->tmpOutStart);
dctx->dictSize += dstSize;
return;
}
@@ -1167,7 +1268,7 @@ static void LZ4F_updateDict(LZ4F_dctx* dctx, const BYTE* dstPtr, size_t dstSize,
if (dctx->dict == dctx->tmpOutBuffer) { /* copy dst into tmp to complete dict */
if (dctx->dictSize + dstSize > dctx->maxBufferSize) { /* tmp buffer not large enough */
size_t const preserveSize = 64 KB - dstSize; /* note : dstSize < 64 KB */
size_t const preserveSize = 64 KB - dstSize;
memcpy(dctx->tmpOutBuffer, dctx->dict + dctx->dictSize - preserveSize, preserveSize);
dctx->dictSize = preserveSize;
}
@@ -1177,7 +1278,7 @@ static void LZ4F_updateDict(LZ4F_dctx* dctx, const BYTE* dstPtr, size_t dstSize,
}
/* join dict & dest into tmp */
{ size_t preserveSize = 64 KB - dstSize; /* note : dstSize < 64 KB */
{ size_t preserveSize = 64 KB - dstSize;
if (preserveSize > dctx->dictSize) preserveSize = dctx->dictSize;
memcpy(dctx->tmpOutBuffer, dctx->dict + dctx->dictSize - preserveSize, preserveSize);
memcpy(dctx->tmpOutBuffer + preserveSize, dstPtr, dstSize);
@@ -1223,7 +1324,7 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
size_t nextSrcSizeHint = 1;
memset(&optionsNull, 0, sizeof(optionsNull));
MEM_INIT(&optionsNull, 0, sizeof(optionsNull));
if (decompressOptionsPtr==NULL) decompressOptionsPtr = &optionsNull;
*srcSizePtr = 0;
*dstSizePtr = 0;
@@ -1244,7 +1345,7 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
}
dctx->tmpInSize = 0;
if (srcEnd-srcPtr == 0) return minFHSize; /* 0-size input */
dctx->tmpInTarget = minFHSize; /* minimum to attempt decode */
dctx->tmpInTarget = minFHSize; /* minimum size to decode header */
dctx->dStage = dstage_storeFrameHeader;
/* fall-through */
@@ -1253,29 +1354,32 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
memcpy(dctx->header + dctx->tmpInSize, srcPtr, sizeToCopy);
dctx->tmpInSize += sizeToCopy;
srcPtr += sizeToCopy;
if (dctx->tmpInSize < dctx->tmpInTarget) {
nextSrcSizeHint = (dctx->tmpInTarget - dctx->tmpInSize) + BHSize; /* rest of header + nextBlockHeader */
doAnotherStage = 0; /* not enough src data, ask for some more */
break;
}
{ size_t const hSize = LZ4F_decodeHeader(dctx, dctx->header, dctx->tmpInTarget); /* will update dStage appropriately */
if (LZ4F_isError(hSize)) return hSize;
}
}
if (dctx->tmpInSize < dctx->tmpInTarget) {
nextSrcSizeHint = (dctx->tmpInTarget - dctx->tmpInSize) + BHSize; /* rest of header + nextBlockHeader */
doAnotherStage = 0; /* not enough src data, ask for some more */
break;
}
{ size_t const hSize = LZ4F_decodeHeader(dctx, dctx->header, dctx->tmpInTarget); /* will update dStage appropriately */
if (LZ4F_isError(hSize)) return hSize;
}
break;
case dstage_init:
if (dctx->frameInfo.contentChecksumFlag) XXH32_reset(&(dctx->xxh), 0);
/* internal buffers allocation */
{ size_t const bufferNeeded = dctx->maxBlockSize + ((dctx->frameInfo.blockMode==LZ4F_blockLinked) * 128 KB) + 4 /* block checksum */;
{ size_t const bufferNeeded = dctx->maxBlockSize
+ ((dctx->frameInfo.blockMode==LZ4F_blockLinked) * 128 KB);
if (bufferNeeded > dctx->maxBufferSize) { /* tmp buffers too small */
dctx->maxBufferSize = 0; /* ensure allocation will be re-attempted on next entry*/
FREEMEM(dctx->tmpIn);
dctx->tmpIn = (BYTE*)ALLOCATOR(dctx->maxBlockSize);
if (dctx->tmpIn == NULL) return err0r(LZ4F_ERROR_allocation_failed);
dctx->tmpIn = (BYTE*)ALLOC(dctx->maxBlockSize + 4 /* block checksum */);
if (dctx->tmpIn == NULL)
return err0r(LZ4F_ERROR_allocation_failed);
FREEMEM(dctx->tmpOutBuffer);
dctx->tmpOutBuffer= (BYTE*)ALLOCATOR(bufferNeeded);
if (dctx->tmpOutBuffer== NULL) return err0r(LZ4F_ERROR_allocation_failed);
dctx->tmpOutBuffer= (BYTE*)ALLOC(bufferNeeded);
if (dctx->tmpOutBuffer== NULL)
return err0r(LZ4F_ERROR_allocation_failed);
dctx->maxBufferSize = bufferNeeded;
} }
dctx->tmpInSize = 0;
@@ -1299,18 +1403,20 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
if (dctx->dStage == dstage_storeBlockHeader) /* can be skipped */
case dstage_storeBlockHeader:
{ size_t sizeToCopy = BHSize - dctx->tmpInSize;
if (sizeToCopy > (size_t)(srcEnd - srcPtr)) sizeToCopy = srcEnd - srcPtr;
{ size_t const remainingInput = (size_t)(srcEnd - srcPtr);
size_t const wantedData = BHSize - dctx->tmpInSize;
size_t const sizeToCopy = MIN(wantedData, remainingInput);
memcpy(dctx->tmpIn + dctx->tmpInSize, srcPtr, sizeToCopy);
srcPtr += sizeToCopy;
dctx->tmpInSize += sizeToCopy;
if (dctx->tmpInSize < BHSize) { /* not enough input for cBlockSize */
nextSrcSizeHint = BHSize - dctx->tmpInSize;
doAnotherStage = 0;
break;
}
selectedIn = dctx->tmpIn;
}
} /* if (dctx->dStage == dstage_storeBlockHeader) */
/* decode block header */
{ size_t const nextCBlockSize = LZ4F_readLE32(selectedIn) & 0x7FFFFFFFU;
@@ -1396,12 +1502,11 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
U32 const calcCRC = XXH32_digest(&dctx->blockChecksum);
if (readCRC != calcCRC)
return err0r(LZ4F_ERROR_blockChecksum_invalid);
}
}
} }
dctx->dStage = dstage_getBlockHeader; /* new block */
break;
case dstage_getCBlock: /* entry from dstage_decodeCBlockSize */
case dstage_getCBlock:
if ((size_t)(srcEnd-srcPtr) < dctx->tmpInTarget) {
dctx->tmpInSize = 0;
dctx->dStage = dstage_storeCBlock;
@@ -1410,11 +1515,12 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
/* input large enough to read full block directly */
selectedIn = srcPtr;
srcPtr += dctx->tmpInTarget;
dctx->dStage = dstage_decodeCBlock;
break;
if (0) /* jump over next block */
case dstage_storeCBlock:
{ size_t const sizeToCopy = MIN(dctx->tmpInTarget - dctx->tmpInSize, (size_t)(srcEnd-srcPtr));
{ size_t const wantedData = dctx->tmpInTarget - dctx->tmpInSize;
size_t const inputLeft = (size_t)(srcEnd-srcPtr);
size_t const sizeToCopy = MIN(wantedData, inputLeft);
memcpy(dctx->tmpIn + dctx->tmpInSize, srcPtr, sizeToCopy);
dctx->tmpInSize += sizeToCopy;
srcPtr += sizeToCopy;
@@ -1424,30 +1530,32 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
break;
}
selectedIn = dctx->tmpIn;
dctx->dStage = dstage_decodeCBlock;
}
/* fall-through */
/* At this stage, input is large enough to decode a block */
case dstage_decodeCBlock:
/* At this stage, input is large enough to decode a block */
if (dctx->frameInfo.blockChecksumFlag) {
dctx->tmpInTarget -= 4;
assert(selectedIn != NULL); /* selectedIn is defined at this stage (either srcPtr, or dctx->tmpIn) */
{ U32 const readBlockCrc = LZ4F_readLE32(selectedIn + dctx->tmpInTarget);
U32 const calcBlockCrc = XXH32(selectedIn, dctx->tmpInTarget, 0);
if (readBlockCrc != calcBlockCrc)
return err0r(LZ4F_ERROR_blockChecksum_invalid);
} }
if ((size_t)(dstEnd-dstPtr) < dctx->maxBlockSize) /* not enough place into dst : decode into tmpOut */
dctx->dStage = dstage_decodeCBlock_intoTmp;
else
dctx->dStage = dstage_decodeCBlock_intoDst;
break;
case dstage_decodeCBlock_intoDst:
{ int const decodedSize = LZ4_decompress_safe_usingDict(
if ((size_t)(dstEnd-dstPtr) >= dctx->maxBlockSize) {
const char* dict = (const char*)dctx->dict;
size_t dictSize = dctx->dictSize;
int decodedSize;
if (dict && dictSize > 1 GB) {
/* the dictSize param is an int, avoid truncation / sign issues */
dict += dictSize - 64 KB;
dictSize = 64 KB;
}
/* enough capacity in `dst` to decompress directly there */
decodedSize = LZ4_decompress_safe_usingDict(
(const char*)selectedIn, (char*)dstPtr,
(int)dctx->tmpInTarget, (int)dctx->maxBlockSize,
(const char*)dctx->dict, (int)dctx->dictSize);
dict, (int)dictSize);
if (decodedSize < 0) return err0r(LZ4F_ERROR_GENERIC); /* decompression failed */
if (dctx->frameInfo.contentChecksumFlag)
XXH32_update(&(dctx->xxh), dstPtr, decodedSize);
@@ -1463,9 +1571,7 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
break;
}
case dstage_decodeCBlock_intoTmp:
/* not enough place into dst : decode into tmpOut */
/* ensure enough place for tmpOut */
if (dctx->frameInfo.blockMode == LZ4F_blockLinked) {
if (dctx->dict == dctx->tmpOutBuffer) {
@@ -1477,14 +1583,21 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
} else { /* dict not within tmp */
size_t const reservedDictSpace = MIN(dctx->dictSize, 64 KB);
dctx->tmpOut = dctx->tmpOutBuffer + reservedDictSpace;
}
}
} }
/* Decode block */
{ int const decodedSize = LZ4_decompress_safe_usingDict(
{ const char* dict = (const char*)dctx->dict;
size_t dictSize = dctx->dictSize;
int decodedSize;
if (dict && dictSize > 1 GB) {
/* the dictSize param is an int, avoid truncation / sign issues */
dict += dictSize - 64 KB;
dictSize = 64 KB;
}
decodedSize = LZ4_decompress_safe_usingDict(
(const char*)selectedIn, (char*)dctx->tmpOut,
(int)dctx->tmpInTarget, (int)dctx->maxBlockSize,
(const char*)dctx->dict, (int)dctx->dictSize);
dict, (int)dictSize);
if (decodedSize < 0) /* decompression failed */
return err0r(LZ4F_ERROR_decompressionFailed);
if (dctx->frameInfo.contentChecksumFlag)
@@ -1502,8 +1615,8 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
memcpy(dstPtr, dctx->tmpOut + dctx->tmpOutStart, sizeToCopy);
/* dictionary management */
if (dctx->frameInfo.blockMode==LZ4F_blockLinked)
LZ4F_updateDict(dctx, dstPtr, sizeToCopy, dstStart, 1);
if (dctx->frameInfo.blockMode == LZ4F_blockLinked)
LZ4F_updateDict(dctx, dstPtr, sizeToCopy, dstStart, 1 /*withinTmp*/);
dctx->tmpOutStart += sizeToCopy;
dstPtr += sizeToCopy;
@@ -1512,35 +1625,34 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
dctx->dStage = dstage_getBlockHeader; /* get next block */
break;
}
/* could not flush everything : stop there, just request a block header */
doAnotherStage = 0;
nextSrcSizeHint = BHSize;
doAnotherStage = 0; /* still some data to flush */
break;
}
case dstage_getSuffix:
{ size_t const suffixSize = dctx->frameInfo.contentChecksumFlag * 4;
if (dctx->frameRemainingSize)
return err0r(LZ4F_ERROR_frameSize_wrong); /* incorrect frame size decoded */
if (suffixSize == 0) { /* frame completed */
nextSrcSizeHint = 0;
LZ4F_resetDecompressionContext(dctx);
doAnotherStage = 0;
break;
}
if ((srcEnd - srcPtr) < 4) { /* not enough size for entire CRC */
dctx->tmpInSize = 0;
dctx->dStage = dstage_storeSuffix;
} else {
selectedIn = srcPtr;
srcPtr += 4;
}
if (dctx->frameRemainingSize)
return err0r(LZ4F_ERROR_frameSize_wrong); /* incorrect frame size decoded */
if (!dctx->frameInfo.contentChecksumFlag) { /* no checksum, frame is completed */
nextSrcSizeHint = 0;
LZ4F_resetDecompressionContext(dctx);
doAnotherStage = 0;
break;
}
if ((srcEnd - srcPtr) < 4) { /* not enough size for entire CRC */
dctx->tmpInSize = 0;
dctx->dStage = dstage_storeSuffix;
} else {
selectedIn = srcPtr;
srcPtr += 4;
}
if (dctx->dStage == dstage_storeSuffix) /* can be skipped */
case dstage_storeSuffix:
{
size_t sizeToCopy = 4 - dctx->tmpInSize;
if (sizeToCopy > (size_t)(srcEnd - srcPtr)) sizeToCopy = srcEnd - srcPtr;
{ size_t const remainingInput = (size_t)(srcEnd - srcPtr);
size_t const wantedData = 4 - dctx->tmpInSize;
size_t const sizeToCopy = MIN(wantedData, remainingInput);
memcpy(dctx->tmpIn + dctx->tmpInSize, srcPtr, sizeToCopy);
srcPtr += sizeToCopy;
dctx->tmpInSize += sizeToCopy;
@@ -1550,9 +1662,9 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
break;
}
selectedIn = dctx->tmpIn;
}
} /* if (dctx->dStage == dstage_storeSuffix) */
/* case dstage_checkSuffix: */ /* no direct call, avoid scan-build warning */
/* case dstage_checkSuffix: */ /* no direct entry, avoid initialization risks */
{ U32 const readCRC = LZ4F_readLE32(selectedIn);
U32 const resultCRC = XXH32_digest(&(dctx->xxh));
if (readCRC != resultCRC)
@@ -1576,8 +1688,7 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
if (dctx->dStage == dstage_storeSFrameSize)
case dstage_storeSFrameSize:
{
size_t const sizeToCopy = MIN(dctx->tmpInTarget - dctx->tmpInSize,
{ size_t const sizeToCopy = MIN(dctx->tmpInTarget - dctx->tmpInSize,
(size_t)(srcEnd - srcPtr) );
memcpy(dctx->header + dctx->tmpInSize, srcPtr, sizeToCopy);
srcPtr += sizeToCopy;
@@ -1589,9 +1700,9 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
break;
}
selectedIn = dctx->header + 4;
}
} /* if (dctx->dStage == dstage_storeSFrameSize) */
/* case dstage_decodeSFrameSize: */ /* no direct access */
/* case dstage_decodeSFrameSize: */ /* no direct entry */
{ size_t const SFrameSize = LZ4F_readLE32(selectedIn);
dctx->frameInfo.contentSize = SFrameSize;
dctx->tmpInTarget = SFrameSize;
@@ -1606,36 +1717,38 @@ size_t LZ4F_decompress(LZ4F_dctx* dctx,
doAnotherStage = 0;
nextSrcSizeHint = dctx->tmpInTarget;
if (nextSrcSizeHint) break; /* still more to skip */
/* frame fully skipped : prepare context for a new frame */
LZ4F_resetDecompressionContext(dctx);
break;
}
}
}
} /* switch (dctx->dStage) */
} /* while (doAnotherStage) */
/* preserve history within tmp if necessary */
if ( (dctx->frameInfo.blockMode==LZ4F_blockLinked)
&& (dctx->dict != dctx->tmpOutBuffer)
&& (dctx->dStage != dstage_getFrameHeader)
&& (!decompressOptionsPtr->stableDst)
&& ((unsigned)(dctx->dStage-1) < (unsigned)(dstage_getSuffix-1)) )
/* preserve history within tmp whenever necessary */
LZ4F_STATIC_ASSERT((unsigned)dstage_init == 2);
if ( (dctx->frameInfo.blockMode==LZ4F_blockLinked) /* next block will use up to 64KB from previous ones */
&& (dctx->dict != dctx->tmpOutBuffer) /* dictionary is not already within tmp */
&& (!decompressOptionsPtr->stableDst) /* cannot rely on dst data to remain there for next call */
&& ((unsigned)(dctx->dStage)-2 < (unsigned)(dstage_getSuffix)-2) ) /* valid stages : [init ... getSuffix[ */
{
if (dctx->dStage == dstage_flushOut) {
size_t preserveSize = dctx->tmpOut - dctx->tmpOutBuffer;
size_t const preserveSize = dctx->tmpOut - dctx->tmpOutBuffer;
size_t copySize = 64 KB - dctx->tmpOutSize;
const BYTE* oldDictEnd = dctx->dict + dctx->dictSize - dctx->tmpOutStart;
if (dctx->tmpOutSize > 64 KB) copySize = 0;
if (copySize > preserveSize) copySize = preserveSize;
memcpy(dctx->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize);
if (copySize > 0)
memcpy(dctx->tmpOutBuffer + preserveSize - copySize, oldDictEnd - copySize, copySize);
dctx->dict = dctx->tmpOutBuffer;
dctx->dictSize = preserveSize + dctx->tmpOutStart;
} else {
size_t newDictSize = dctx->dictSize;
const BYTE* oldDictEnd = dctx->dict + dctx->dictSize;
if ((newDictSize) > 64 KB) newDictSize = 64 KB;
const BYTE* const oldDictEnd = dctx->dict + dctx->dictSize;
size_t const newDictSize = MIN(dctx->dictSize, 64 KB);
memcpy(dctx->tmpOutBuffer, oldDictEnd - newDictSize, newDictSize);
if (newDictSize > 0)
memcpy(dctx->tmpOutBuffer, oldDictEnd - newDictSize, newDictSize);
dctx->dict = dctx->tmpOutBuffer;
dctx->dictSize = newDictSize;

268
C/lz4/lz4frame.h
View File

@@ -33,9 +33,10 @@
*/
/* LZ4F is a stand-alone API to create LZ4-compressed frames
* conformant with specification v1.5.1.
* conformant with specification v1.6.1.
* It also offers streaming capabilities.
* lz4.h is not required when using lz4frame.h.
* lz4.h is not required when using lz4frame.h,
* except to get constant such as LZ4_VERSION_NUMBER.
* */
#ifndef LZ4F_H_09782039843
@@ -93,8 +94,8 @@ extern "C" {
**************************************/
typedef size_t LZ4F_errorCode_t;
LZ4FLIB_API unsigned LZ4F_isError(LZ4F_errorCode_t code); /**< tells if a `LZ4F_errorCode_t` function result is an error code */
LZ4FLIB_API const char* LZ4F_getErrorName(LZ4F_errorCode_t code); /**< return error code string; useful for debugging */
LZ4FLIB_API unsigned LZ4F_isError(LZ4F_errorCode_t code); /**< tells when a function result is an error code */
LZ4FLIB_API const char* LZ4F_getErrorName(LZ4F_errorCode_t code); /**< return error code string; for debugging */
/*-************************************
@@ -159,38 +160,48 @@ typedef LZ4F_contentChecksum_t contentChecksum_t;
/*! LZ4F_frameInfo_t :
* makes it possible to set or read frame parameters.
* It's not required to set all fields, as long as the structure was initially memset() to zero.
* For all fields, 0 sets it to default value */
* Structure must be first init to 0, using memset() or LZ4F_INIT_FRAMEINFO,
* setting all parameters to default.
* It's then possible to update selectively some parameters */
typedef struct {
LZ4F_blockSizeID_t blockSizeID; /* max64KB, max256KB, max1MB, max4MB ; 0 == default */
LZ4F_blockMode_t blockMode; /* LZ4F_blockLinked, LZ4F_blockIndependent ; 0 == default */
LZ4F_contentChecksum_t contentChecksumFlag; /* if enabled, frame is terminated with a 32-bits checksum of decompressed data ; 0 == disabled (default) */
LZ4F_frameType_t frameType; /* read-only field : LZ4F_frame or LZ4F_skippableFrame */
unsigned long long contentSize; /* Size of uncompressed content ; 0 == unknown */
unsigned dictID; /* Dictionary ID, sent by the compressor to help decoder select the correct dictionary; 0 == no dictID provided */
LZ4F_blockChecksum_t blockChecksumFlag; /* if enabled, each block is followed by a checksum of block's compressed data ; 0 == disabled (default) */
LZ4F_blockSizeID_t blockSizeID; /* max64KB, max256KB, max1MB, max4MB; 0 == default */
LZ4F_blockMode_t blockMode; /* LZ4F_blockLinked, LZ4F_blockIndependent; 0 == default */
LZ4F_contentChecksum_t contentChecksumFlag; /* 1: frame terminated with 32-bit checksum of decompressed data; 0: disabled (default) */
LZ4F_frameType_t frameType; /* read-only field : LZ4F_frame or LZ4F_skippableFrame */
unsigned long long contentSize; /* Size of uncompressed content ; 0 == unknown */
unsigned dictID; /* Dictionary ID, sent by compressor to help decoder select correct dictionary; 0 == no dictID provided */
LZ4F_blockChecksum_t blockChecksumFlag; /* 1: each block followed by a checksum of block's compressed data; 0: disabled (default) */
} LZ4F_frameInfo_t;
#define LZ4F_INIT_FRAMEINFO { 0, 0, 0, 0, 0, 0, 0 } /* v1.8.3+ */
/*! LZ4F_preferences_t :
* makes it possible to supply detailed compression parameters to the stream interface.
* It's not required to set all fields, as long as the structure was initially memset() to zero.
* makes it possible to supply advanced compression instructions to streaming interface.
* Structure must be first init to 0, using memset() or LZ4F_INIT_PREFERENCES,
* setting all parameters to default.
* All reserved fields must be set to zero. */
typedef struct {
LZ4F_frameInfo_t frameInfo;
int compressionLevel; /* 0 == default (fast mode); values above LZ4HC_CLEVEL_MAX count as LZ4HC_CLEVEL_MAX; values below 0 trigger "fast acceleration", proportional to value */
unsigned autoFlush; /* 1 == always flush, to reduce usage of internal buffers */
unsigned reserved[4]; /* must be zero for forward compatibility */
int compressionLevel; /* 0: default (fast mode); values > LZ4HC_CLEVEL_MAX count as LZ4HC_CLEVEL_MAX; values < 0 trigger "fast acceleration" */
unsigned autoFlush; /* 1: always flush; reduces usage of internal buffers */
unsigned favorDecSpeed; /* 1: parser favors decompression speed vs compression ratio. Only works for high compression modes (>= LZ4HC_CLEVEL_OPT_MIN) */ /* v1.8.2+ */
unsigned reserved[3]; /* must be zero for forward compatibility */
} LZ4F_preferences_t;
LZ4FLIB_API int LZ4F_compressionLevel_max(void);
#define LZ4F_INIT_PREFERENCES { LZ4F_INIT_FRAMEINFO, 0, 0, 0, { 0, 0, 0 } } /* v1.8.3+ */
/*-*********************************
* Simple compression function
***********************************/
LZ4FLIB_API int LZ4F_compressionLevel_max(void);
/*! LZ4F_compressFrameBound() :
* Returns the maximum possible size of a frame compressed with LZ4F_compressFrame() given srcSize content and preferences.
* Note : this result is only usable with LZ4F_compressFrame(), not with multi-segments compression.
* Returns the maximum possible compressed size with LZ4F_compressFrame() given srcSize and preferences.
* `preferencesPtr` is optional. It can be replaced by NULL, in which case, the function will assume default preferences.
* Note : this result is only usable with LZ4F_compressFrame().
* It may also be used with LZ4F_compressUpdate() _if no flush() operation_ is performed.
*/
LZ4FLIB_API size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
@@ -219,8 +230,9 @@ typedef struct {
/*--- Resource Management ---*/
#define LZ4F_VERSION 100
#define LZ4F_VERSION 100 /* This number can be used to check for an incompatible API breaking change */
LZ4FLIB_API unsigned LZ4F_getVersion(void);
/*! LZ4F_createCompressionContext() :
* The first thing to do is to create a compressionContext object, which will be used in all compression operations.
* This is achieved using LZ4F_createCompressionContext(), which takes as argument a version.
@@ -235,7 +247,7 @@ LZ4FLIB_API LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
/*---- Compression ----*/
#define LZ4F_HEADER_SIZE_MAX 19
#define LZ4F_HEADER_SIZE_MAX 19 /* LZ4 Frame header size can vary from 7 to 19 bytes */
/*! LZ4F_compressBegin() :
* will write the frame header into dstBuffer.
* dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
@@ -248,45 +260,58 @@ LZ4FLIB_API size_t LZ4F_compressBegin(LZ4F_cctx* cctx,
const LZ4F_preferences_t* prefsPtr);
/*! LZ4F_compressBound() :
* Provides dstCapacity given a srcSize to guarantee operation success in worst case situations.
* prefsPtr is optional : you can provide NULL as argument, preferences will be set to cover worst case scenario.
* Result is always the same for a srcSize and prefsPtr, so it can be trusted to size reusable buffers.
* When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() operations.
* Provides minimum dstCapacity required to guarantee compression success
* given a srcSize and preferences, covering worst case scenario.
* prefsPtr is optional : when NULL is provided, preferences will be set to cover worst case scenario.
* Estimation is valid for either LZ4F_compressUpdate(), LZ4F_flush() or LZ4F_compressEnd(),
* Estimation includes the possibility that internal buffer might already be filled by up to (blockSize-1) bytes.
* It also includes frame footer (ending + checksum), which would have to be generated by LZ4F_compressEnd().
* Estimation doesn't include frame header, as it was already generated by LZ4F_compressBegin().
* Result is always the same for a srcSize and prefsPtr, so it can be trusted to size reusable buffers.
* When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() operations.
*/
LZ4FLIB_API size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
/*! LZ4F_compressUpdate() :
* LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
* An important rule is that dstCapacity MUST be large enough to ensure operation success even in worst case situations.
* This value is provided by LZ4F_compressBound().
* If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
* LZ4F_compressUpdate() doesn't guarantee error recovery. When an error occurs, compression context must be freed or resized.
* LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
* Important rule: dstCapacity MUST be large enough to ensure operation success even in worst case situations.
* This value is provided by LZ4F_compressBound().
* If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
* LZ4F_compressUpdate() doesn't guarantee error recovery.
* When an error occurs, compression context must be freed or resized.
* `cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
* @return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
* or an error code if it fails (which can be tested using LZ4F_isError())
*/
LZ4FLIB_API size_t LZ4F_compressUpdate(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const void* srcBuffer, size_t srcSize, const LZ4F_compressOptions_t* cOptPtr);
LZ4FLIB_API size_t LZ4F_compressUpdate(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const void* srcBuffer, size_t srcSize,
const LZ4F_compressOptions_t* cOptPtr);
/*! LZ4F_flush() :
* When data must be generated and sent immediately, without waiting for a block to be completely filled,
* it's possible to call LZ4_flush(). It will immediately compress any data buffered within cctx.
* When data must be generated and sent immediately, without waiting for a block to be completely filled,
* it's possible to call LZ4_flush(). It will immediately compress any data buffered within cctx.
* `dstCapacity` must be large enough to ensure the operation will be successful.
* `cOptPtr` is optional : it's possible to provide NULL, all options will be set to default.
* @return : number of bytes written into dstBuffer (it can be zero, which means there was no data stored within cctx)
* @return : nb of bytes written into dstBuffer (can be zero, when there is no data stored within cctx)
* or an error code if it fails (which can be tested using LZ4F_isError())
*/
LZ4FLIB_API size_t LZ4F_flush(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const LZ4F_compressOptions_t* cOptPtr);
LZ4FLIB_API size_t LZ4F_flush(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_compressOptions_t* cOptPtr);
/*! LZ4F_compressEnd() :
* To properly finish an LZ4 frame, invoke LZ4F_compressEnd().
* It will flush whatever data remained within `cctx` (like LZ4_flush())
* and properly finalize the frame, with an endMark and a checksum.
* `cOptPtr` is optional : NULL can be provided, in which case all options will be set to default.
* @return : number of bytes written into dstBuffer (necessarily >= 4 (endMark), or 8 if optional frame checksum is enabled)
* @return : nb of bytes written into dstBuffer, necessarily >= 4 (endMark),
* or an error code if it fails (which can be tested using LZ4F_isError())
* A successful call to LZ4F_compressEnd() makes `cctx` available again for another compression task.
*/
LZ4FLIB_API size_t LZ4F_compressEnd(LZ4F_cctx* cctx, void* dstBuffer, size_t dstCapacity, const LZ4F_compressOptions_t* cOptPtr);
LZ4FLIB_API size_t LZ4F_compressEnd(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_compressOptions_t* cOptPtr);
/*-*********************************
@@ -296,21 +321,21 @@ typedef struct LZ4F_dctx_s LZ4F_dctx; /* incomplete type */
typedef LZ4F_dctx* LZ4F_decompressionContext_t; /* compatibility with previous API versions */
typedef struct {
unsigned stableDst; /* pledge that at least 64KB+64Bytes of previously decompressed data remain unmodifed where it was decoded. This optimization skips storage operations in tmp buffers */
unsigned stableDst; /* pledges that last 64KB decompressed data will remain available unmodified. This optimization skips storage operations in tmp buffers. */
unsigned reserved[3]; /* must be set to zero for forward compatibility */
} LZ4F_decompressOptions_t;
/* Resource management */
/*!LZ4F_createDecompressionContext() :
* Create an LZ4F_dctx object, to track all decompression operations.
* The version provided MUST be LZ4F_VERSION.
* The function provides a pointer to an allocated and initialized LZ4F_dctx object.
* The result is an errorCode, which can be tested using LZ4F_isError().
* dctx memory can be released using LZ4F_freeDecompressionContext();
* The result of LZ4F_freeDecompressionContext() is indicative of the current state of decompressionContext when being released.
* That is, it should be == 0 if decompression has been completed fully and correctly.
/*! LZ4F_createDecompressionContext() :
* Create an LZ4F_dctx object, to track all decompression operations.
* The version provided MUST be LZ4F_VERSION.
* The function provides a pointer to an allocated and initialized LZ4F_dctx object.
* The result is an errorCode, which can be tested using LZ4F_isError().
* dctx memory can be released using LZ4F_freeDecompressionContext();
* Result of LZ4F_freeDecompressionContext() indicates current state of decompressionContext when being released.
* That is, it should be == 0 if decompression has been completed fully and correctly.
*/
LZ4FLIB_API LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_dctx** dctxPtr, unsigned version);
LZ4FLIB_API LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_dctx* dctx);
@@ -347,27 +372,32 @@ LZ4FLIB_API size_t LZ4F_getFrameInfo(LZ4F_dctx* dctx,
/*! LZ4F_decompress() :
* Call this function repetitively to regenerate compressed data from `srcBuffer`.
* The function will attempt to decode up to *srcSizePtr bytes from srcBuffer, into dstBuffer of capacity *dstSizePtr.
* The function will read up to *srcSizePtr bytes from srcBuffer,
* and decompress data into dstBuffer, of capacity *dstSizePtr.
*
* The number of bytes regenerated into dstBuffer is provided within *dstSizePtr (necessarily <= original value).
* The nb of bytes consumed from srcBuffer will be written into *srcSizePtr (necessarily <= original value).
* The nb of bytes decompressed into dstBuffer will be written into *dstSizePtr (necessarily <= original value).
*
* The number of bytes consumed from srcBuffer is provided within *srcSizePtr (necessarily <= original value).
* Number of bytes consumed can be < number of bytes provided.
* It typically happens when dstBuffer is not large enough to contain all decoded data.
* The function does not necessarily read all input bytes, so always check value in *srcSizePtr.
* Unconsumed source data must be presented again in subsequent invocations.
*
* `dstBuffer` content is expected to be flushed between each invocation, as its content will be overwritten.
* `dstBuffer` itself can be changed at will between each consecutive function invocation.
* `dstBuffer` can freely change between each consecutive function invocation.
* `dstBuffer` content will be overwritten.
*
* @return : an hint of how many `srcSize` bytes LZ4F_decompress() expects for next call.
* Schematically, it's the size of the current (or remaining) compressed block + header of next block.
* Respecting the hint provides some small speed benefit, because it skips intermediate buffers.
* This is just a hint though, it's always possible to provide any srcSize.
*
* When a frame is fully decoded, @return will be 0 (no more data expected).
* When provided with more bytes than necessary to decode a frame,
* LZ4F_decompress() will stop reading exactly at end of current frame, and @return 0.
*
* If decompression failed, @return is an error code, which can be tested using LZ4F_isError().
* After a decompression error, the `dctx` context is not resumable.
* Use LZ4F_resetDecompressionContext() to return to clean state.
*
* After a frame is fully decoded, dctx can be used again to decompress another frame.
* After a decompression error, use LZ4F_resetDecompressionContext() before re-using dctx, to return to clean state.
*/
LZ4FLIB_API size_t LZ4F_decompress(LZ4F_dctx* dctx,
void* dstBuffer, size_t* dstSizePtr,
@@ -375,11 +405,11 @@ LZ4FLIB_API size_t LZ4F_decompress(LZ4F_dctx* dctx,
const LZ4F_decompressOptions_t* dOptPtr);
/*! LZ4F_resetDecompressionContext() : v1.8.0
/*! LZ4F_resetDecompressionContext() : added in v1.8.0
* In case of an error, the context is left in "undefined" state.
* In which case, it's necessary to reset it, before re-using it.
* This method can also be used to abruptly stop an unfinished decompression,
* and start a new one using the same context. */
* This method can also be used to abruptly stop any unfinished decompression,
* and start a new one using same context resources. */
LZ4FLIB_API void LZ4F_resetDecompressionContext(LZ4F_dctx* dctx); /* always successful */
@@ -389,3 +419,123 @@ LZ4FLIB_API void LZ4F_resetDecompressionContext(LZ4F_dctx* dctx); /* always su
#endif
#endif /* LZ4F_H_09782039843 */
#if defined(LZ4F_STATIC_LINKING_ONLY) && !defined(LZ4F_H_STATIC_09782039843)
#define LZ4F_H_STATIC_09782039843
#if defined (__cplusplus)
extern "C" {
#endif
/* These declarations are not stable and may change in the future. They are
* therefore only safe to depend on when the caller is statically linked
* against the library. To access their declarations, define
* LZ4F_STATIC_LINKING_ONLY.
*
* There is a further protection mechanism where these symbols aren't published
* into shared/dynamic libraries. You can override this behavior and force
* them to be published by defining LZ4F_PUBLISH_STATIC_FUNCTIONS. Use at
* your own risk.
*/
#ifdef LZ4F_PUBLISH_STATIC_FUNCTIONS
#define LZ4FLIB_STATIC_API LZ4FLIB_API
#else
#define LZ4FLIB_STATIC_API
#endif
/* --- Error List --- */
#define LZ4F_LIST_ERRORS(ITEM) \
ITEM(OK_NoError) \
ITEM(ERROR_GENERIC) \
ITEM(ERROR_maxBlockSize_invalid) \
ITEM(ERROR_blockMode_invalid) \
ITEM(ERROR_contentChecksumFlag_invalid) \
ITEM(ERROR_compressionLevel_invalid) \
ITEM(ERROR_headerVersion_wrong) \
ITEM(ERROR_blockChecksum_invalid) \
ITEM(ERROR_reservedFlag_set) \
ITEM(ERROR_allocation_failed) \
ITEM(ERROR_srcSize_tooLarge) \
ITEM(ERROR_dstMaxSize_tooSmall) \
ITEM(ERROR_frameHeader_incomplete) \
ITEM(ERROR_frameType_unknown) \
ITEM(ERROR_frameSize_wrong) \
ITEM(ERROR_srcPtr_wrong) \
ITEM(ERROR_decompressionFailed) \
ITEM(ERROR_headerChecksum_invalid) \
ITEM(ERROR_contentChecksum_invalid) \
ITEM(ERROR_frameDecoding_alreadyStarted) \
ITEM(ERROR_maxCode)
#define LZ4F_GENERATE_ENUM(ENUM) LZ4F_##ENUM,
/* enum list is exposed, to handle specific errors */
typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM) } LZ4F_errorCodes;
LZ4FLIB_STATIC_API LZ4F_errorCodes LZ4F_getErrorCode(size_t functionResult);
/**********************************
* Bulk processing dictionary API
*********************************/
typedef struct LZ4F_CDict_s LZ4F_CDict;
/*! LZ4_createCDict() :
* When compressing multiple messages / blocks with the same dictionary, it's recommended to load it just once.
* LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay.
* LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only.
* `dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict */
LZ4FLIB_STATIC_API LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize);
LZ4FLIB_STATIC_API void LZ4F_freeCDict(LZ4F_CDict* CDict);
/*! LZ4_compressFrame_usingCDict() :
* Compress an entire srcBuffer into a valid LZ4 frame using a digested Dictionary.
* cctx must point to a context created by LZ4F_createCompressionContext().
* If cdict==NULL, compress without a dictionary.
* dstBuffer MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
* If this condition is not respected, function will fail (@return an errorCode).
* The LZ4F_preferences_t structure is optional : you may provide NULL as argument,
* but it's not recommended, as it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer.
* or an error code if it fails (can be tested using LZ4F_isError()) */
LZ4FLIB_STATIC_API size_t LZ4F_compressFrame_usingCDict(
LZ4F_cctx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* preferencesPtr);
/*! LZ4F_compressBegin_usingCDict() :
* Inits streaming dictionary compression, and writes the frame header into dstBuffer.
* dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
* `prefsPtr` is optional : you may provide NULL as argument,
* however, it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer for the header,
* or an error code (which can be tested using LZ4F_isError()) */
LZ4FLIB_STATIC_API size_t LZ4F_compressBegin_usingCDict(
LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* prefsPtr);
/*! LZ4F_decompress_usingDict() :
* Same as LZ4F_decompress(), using a predefined dictionary.
* Dictionary is used "in place", without any preprocessing.
* It must remain accessible throughout the entire frame decoding. */
LZ4FLIB_STATIC_API size_t LZ4F_decompress_usingDict(
LZ4F_dctx* dctxPtr,
void* dstBuffer, size_t* dstSizePtr,
const void* srcBuffer, size_t* srcSizePtr,
const void* dict, size_t dictSize,
const LZ4F_decompressOptions_t* decompressOptionsPtr);
#if defined (__cplusplus)
}
#endif
#endif /* defined(LZ4F_STATIC_LINKING_ONLY) && !defined(LZ4F_H_STATIC_09782039843) */

104
C/lz4/lz4frame_static.h
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@@ -36,108 +36,12 @@
#ifndef LZ4FRAME_STATIC_H_0398209384
#define LZ4FRAME_STATIC_H_0398209384
#if defined (__cplusplus)
extern "C" {
#endif
/* lz4frame_static.h should be used solely in the context of static linking.
* It contains definitions which are not stable and may change in the future.
* Never use it in the context of DLL linking.
/* The declarations that formerly were made here have been merged into
* lz4frame.h, protected by the LZ4F_STATIC_LINKING_ONLY macro. Going forward,
* it is recommended to simply include that header directly.
*/
/* --- Dependency --- */
#define LZ4F_STATIC_LINKING_ONLY
#include "lz4frame.h"
/* --- Error List --- */
#define LZ4F_LIST_ERRORS(ITEM) \
ITEM(OK_NoError) \
ITEM(ERROR_GENERIC) \
ITEM(ERROR_maxBlockSize_invalid) \
ITEM(ERROR_blockMode_invalid) \
ITEM(ERROR_contentChecksumFlag_invalid) \
ITEM(ERROR_compressionLevel_invalid) \
ITEM(ERROR_headerVersion_wrong) \
ITEM(ERROR_blockChecksum_invalid) \
ITEM(ERROR_reservedFlag_set) \
ITEM(ERROR_allocation_failed) \
ITEM(ERROR_srcSize_tooLarge) \
ITEM(ERROR_dstMaxSize_tooSmall) \
ITEM(ERROR_frameHeader_incomplete) \
ITEM(ERROR_frameType_unknown) \
ITEM(ERROR_frameSize_wrong) \
ITEM(ERROR_srcPtr_wrong) \
ITEM(ERROR_decompressionFailed) \
ITEM(ERROR_headerChecksum_invalid) \
ITEM(ERROR_contentChecksum_invalid) \
ITEM(ERROR_frameDecoding_alreadyStarted) \
ITEM(ERROR_maxCode)
#define LZ4F_GENERATE_ENUM(ENUM) LZ4F_##ENUM,
/* enum list is exposed, to handle specific errors */
typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM) } LZ4F_errorCodes;
LZ4F_errorCodes LZ4F_getErrorCode(size_t functionResult);
/**********************************
* Bulk processing dictionary API
*********************************/
typedef struct LZ4F_CDict_s LZ4F_CDict;
/*! LZ4_createCDict() :
* When compressing multiple messages / blocks with the same dictionary, it's recommended to load it just once.
* LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay.
* LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only.
* `dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict */
LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize);
void LZ4F_freeCDict(LZ4F_CDict* CDict);
/*! LZ4_compressFrame_usingCDict() :
* Compress an entire srcBuffer into a valid LZ4 frame using a digested Dictionary.
* If cdict==NULL, compress without a dictionary.
* dstBuffer MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
* If this condition is not respected, function will fail (@return an errorCode).
* The LZ4F_preferences_t structure is optional : you may provide NULL as argument,
* but it's not recommended, as it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer.
* or an error code if it fails (can be tested using LZ4F_isError()) */
size_t LZ4F_compressFrame_usingCDict(void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* preferencesPtr);
/*! LZ4F_compressBegin_usingCDict() :
* Inits streaming dictionary compression, and writes the frame header into dstBuffer.
* dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
* `prefsPtr` is optional : you may provide NULL as argument,
* however, it's the only way to provide dictID in the frame header.
* @return : number of bytes written into dstBuffer for the header,
* or an error code (which can be tested using LZ4F_isError()) */
size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* prefsPtr);
/*! LZ4F_decompress_usingDict() :
* Same as LZ4F_decompress(), using a predefined dictionary.
* Dictionary is used "in place", without any preprocessing.
* It must remain accessible throughout the entire frame decoding. */
size_t LZ4F_decompress_usingDict(LZ4F_dctx* dctxPtr,
void* dstBuffer, size_t* dstSizePtr,
const void* srcBuffer, size_t* srcSizePtr,
const void* dict, size_t dictSize,
const LZ4F_decompressOptions_t* decompressOptionsPtr);
#if defined (__cplusplus)
}
#endif
#endif /* LZ4FRAME_STATIC_H_0398209384 */

991
C/lz4/lz4hc.c
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191
C/lz4/lz4hc.h
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@@ -39,14 +39,14 @@ extern "C" {
#endif
/* --- Dependency --- */
/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
/* note : lz4hc requires lz4.h/lz4.c for compilation */
#include "lz4.h" /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
/* --- Useful constants --- */
#define LZ4HC_CLEVEL_MIN 3
#define LZ4HC_CLEVEL_DEFAULT 9
#define LZ4HC_CLEVEL_OPT_MIN 11
#define LZ4HC_CLEVEL_OPT_MIN 10
#define LZ4HC_CLEVEL_MAX 12
@@ -54,12 +54,12 @@ extern "C" {
* Block Compression
**************************************/
/*! LZ4_compress_HC() :
* Compress data from `src` into `dst`, using the more powerful but slower "HC" algorithm.
* Compress data from `src` into `dst`, using the more powerful but slower "HC" algorithm.
* `dst` must be already allocated.
* Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
* Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
* `compressionLevel` : Recommended values are between 4 and 9, although any value between 1 and LZ4HC_CLEVEL_MAX will work.
* Values >LZ4HC_CLEVEL_MAX behave the same as LZ4HC_CLEVEL_MAX.
* 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.
*/
@@ -72,12 +72,12 @@ LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int dst
/*! LZ4_compress_HC_extStateHC() :
* Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
* Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
* `state` size is provided by LZ4_sizeofStateHC().
* Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
* Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() should do properly).
*/
LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
LZ4LIB_API int LZ4_sizeofStateHC(void);
LZ4LIB_API int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
/*-************************************
@@ -87,10 +87,10 @@ LZ4LIB_API int LZ4_sizeofStateHC(void);
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.
* Existing states can be re-used several times, using LZ4_resetStreamHC().
* These methods are API and ABI stable, they can be used in combination with a DLL.
* These functions create and release memory for LZ4 HC streaming state.
* Newly created states are automatically initialized.
* Existing states can be re-used several times, using LZ4_resetStreamHC().
* These methods are API and ABI stable, they can be used in combination with a DLL.
*/
LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
LZ4LIB_API int LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
@@ -123,13 +123,13 @@ LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, in
*/
/*-*************************************
/*-**************************************************************
* PRIVATE DEFINITIONS :
* Do not use these definitions.
* They are exposed to allow static allocation of `LZ4_streamHC_t`.
* Using these definitions makes the code vulnerable to potential API break when upgrading LZ4
**************************************/
#define LZ4HC_DICTIONARY_LOGSIZE 17 /* because of btopt, hc would only need 16 */
****************************************************************/
#define LZ4HC_DICTIONARY_LOGSIZE 16
#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
@@ -141,41 +141,43 @@ LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, in
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h>
typedef struct
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 */
uint8_t* inputBuffer; /* deprecated */
uint32_t dictLimit; /* below that point, need extDict */
uint32_t lowLimit; /* below that point, no more dict */
uint32_t nextToUpdate; /* index from which to continue dictionary update */
uint32_t searchNum; /* only for optimal parser */
uint32_t compressionLevel;
} LZ4HC_CCtx_internal;
short compressionLevel;
short favorDecSpeed;
const LZ4HC_CCtx_internal* dictCtx;
};
#else
typedef struct
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 char* inputBuffer; /* deprecated */
unsigned int dictLimit; /* below that point, need extDict */
unsigned int lowLimit; /* below that point, no more dict */
unsigned int nextToUpdate; /* index from which to continue dictionary update */
unsigned int searchNum; /* only for optimal parser */
int compressionLevel;
} LZ4HC_CCtx_internal;
short compressionLevel;
short favorDecSpeed;
const LZ4HC_CCtx_internal* dictCtx;
};
#endif
#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56) /* 393268 */
#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56) /* 262200 */
#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
union LZ4_streamHC_u {
size_t table[LZ4_STREAMHCSIZE_SIZET];
@@ -197,26 +199,32 @@ union LZ4_streamHC_u {
/* see lz4.h LZ4_DISABLE_DEPRECATE_WARNINGS to turn off deprecation warnings */
/* deprecated compression functions */
/* these functions will trigger warning messages in future releases */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC (const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC() instead") int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
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);
/* Deprecated Streaming functions using older model; should no longer be used */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
/* 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_resetStreamHC() instead") LZ4LIB_API int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
#if defined (__cplusplus)
@@ -225,18 +233,23 @@ LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStr
#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
#if defined (__cplusplus)
extern "C" {
#endif
/*! LZ4_compress_HC_destSize() : v1.8.0 (experimental)
* Will try to compress as much data from `src` as possible
* that can fit into `targetDstSize` budget.
@@ -246,9 +259,9 @@ LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStr
* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`
*/
int LZ4_compress_HC_destSize(void* LZ4HC_Data,
const char* src, char* dst,
int* srcSizePtr, int targetDstSize,
int compressionLevel);
const char* src, char* dst,
int* srcSizePtr, int targetDstSize,
int compressionLevel);
/*! LZ4_compress_HC_continue_destSize() : v1.8.0 (experimental)
* Similar as LZ4_compress_HC_continue(),
@@ -258,21 +271,85 @@ int LZ4_compress_HC_destSize(void* LZ4HC_Data,
* @return : the number of bytes written into 'dst'
* or 0 if compression fails.
* `srcSizePtr` : value will be updated to indicate how much bytes were read from `src`.
* Important : due to limitations, this prototype only works well up to cLevel < LZ4HC_CLEVEL_OPT_MIN
* beyond that level, compression performance will be much reduced due to internal incompatibilities
*/
int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
const char* src, char* dst,
int* srcSizePtr, int targetDstSize);
/*! LZ4_setCompressionLevel() : v1.8.0 (experimental)
* It's possible to change compression level after LZ4_resetStreamHC(), between 2 invocations of LZ4_compress_HC_continue*(),
* but that requires to stay in the same mode (aka 1-10 or 11-12).
* This function ensures this condition.
* It's possible to change compression level between 2 invocations of LZ4_compress_HC_continue*()
*/
void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
/*! LZ4_favorDecompressionSpeed() : v1.8.2 (experimental)
* Parser will select decisions favoring decompression over compression ratio.
* Only work at highest compression settings (level >= LZ4HC_CLEVEL_OPT_MIN)
*/
void LZ4_favorDecompressionSpeed(LZ4_streamHC_t* LZ4_streamHCPtr, int favor);
/*! LZ4_resetStreamHC_fast() :
* 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
*/
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().
*/
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_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 */

366
C/lz4/lz4opt.h
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@@ -1,366 +0,0 @@
/*
lz4opt.h - Optimal Mode of LZ4
Copyright (C) 2015-2017, Przemyslaw Skibinski <inikep@gmail.com>
Note : this file is intended to be included within lz4hc.c
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 source repository : https://github.com/lz4/lz4
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#define LZ4_OPT_NUM (1<<12)
typedef struct {
int off;
int len;
} LZ4HC_match_t;
typedef struct {
int price;
int off;
int mlen;
int litlen;
} LZ4HC_optimal_t;
/* price in bytes */
FORCE_INLINE size_t LZ4HC_literalsPrice(size_t litlen)
{
size_t price = litlen;
if (litlen >= (size_t)RUN_MASK)
price += 1 + (litlen-RUN_MASK)/255;
return price;
}
/* requires mlen >= MINMATCH */
FORCE_INLINE size_t LZ4HC_sequencePrice(size_t litlen, size_t mlen)
{
size_t price = 2 + 1; /* 16-bit offset + token */
price += LZ4HC_literalsPrice(litlen);
if (mlen >= (size_t)(ML_MASK+MINMATCH))
price+= 1 + (mlen-(ML_MASK+MINMATCH))/255;
return price;
}
/*-*************************************
* Binary Tree search
***************************************/
FORCE_INLINE int LZ4HC_BinTree_InsertAndGetAllMatches (
LZ4HC_CCtx_internal* ctx,
const BYTE* const ip,
const BYTE* const iHighLimit,
size_t best_mlen,
LZ4HC_match_t* matches,
int* matchNum)
{
U16* const chainTable = ctx->chainTable;
U32* const HashTable = ctx->hashTable;
const BYTE* const base = ctx->base;
const U32 dictLimit = ctx->dictLimit;
const U32 current = (U32)(ip - base);
const U32 lowLimit = (ctx->lowLimit + MAX_DISTANCE > current) ? ctx->lowLimit : current - (MAX_DISTANCE - 1);
const BYTE* const dictBase = ctx->dictBase;
const BYTE* match;
int nbAttempts = ctx->searchNum;
int mnum = 0;
U16 *ptr0, *ptr1, delta0, delta1;
U32 matchIndex;
size_t matchLength = 0;
U32* HashPos;
if (ip + MINMATCH > iHighLimit) return 1;
/* HC4 match finder */
HashPos = &HashTable[LZ4HC_hashPtr(ip)];
matchIndex = *HashPos;
*HashPos = current;
ptr0 = &DELTANEXTMAXD(current*2+1);
ptr1 = &DELTANEXTMAXD(current*2);
delta0 = delta1 = (U16)(current - matchIndex);
while ((matchIndex < current) && (matchIndex>=lowLimit) && (nbAttempts)) {
nbAttempts--;
if (matchIndex >= dictLimit) {
match = base + matchIndex;
matchLength = LZ4_count(ip, match, iHighLimit);
} else {
const BYTE* vLimit = ip + (dictLimit - matchIndex);
match = dictBase + matchIndex;
if (vLimit > iHighLimit) vLimit = iHighLimit;
matchLength = LZ4_count(ip, match, vLimit);
if ((ip+matchLength == vLimit) && (vLimit < iHighLimit))
matchLength += LZ4_count(ip+matchLength, base+dictLimit, iHighLimit);
if (matchIndex+matchLength >= dictLimit)
match = base + matchIndex; /* to prepare for next usage of match[matchLength] */
}
if (matchLength > best_mlen) {
best_mlen = matchLength;
if (matches) {
if (matchIndex >= dictLimit)
matches[mnum].off = (int)(ip - match);
else
matches[mnum].off = (int)(ip - (base + matchIndex)); /* virtual matchpos */
matches[mnum].len = (int)matchLength;
mnum++;
}
if (best_mlen > LZ4_OPT_NUM) break;
}
if (ip+matchLength >= iHighLimit) /* equal : no way to know if inf or sup */
break; /* drop , to guarantee consistency ; miss a bit of compression, but other solutions can corrupt the tree */
DEBUGLOG(6, "ip :%016llX", (U64)ip);
DEBUGLOG(6, "match:%016llX", (U64)match);
if (*(ip+matchLength) < *(match+matchLength)) {
*ptr0 = delta0;
ptr0 = &DELTANEXTMAXD(matchIndex*2);
if (*ptr0 == (U16)-1) break;
delta0 = *ptr0;
delta1 += delta0;
matchIndex -= delta0;
} else {
*ptr1 = delta1;
ptr1 = &DELTANEXTMAXD(matchIndex*2+1);
if (*ptr1 == (U16)-1) break;
delta1 = *ptr1;
delta0 += delta1;
matchIndex -= delta1;
}
}
*ptr0 = (U16)-1;
*ptr1 = (U16)-1;
if (matchNum) *matchNum = mnum;
/* if (best_mlen > 8) return best_mlen-8; */
if (!matchNum) return 1;
return 1;
}
FORCE_INLINE void LZ4HC_updateBinTree(LZ4HC_CCtx_internal* ctx, const BYTE* const ip, const BYTE* const iHighLimit)
{
const BYTE* const base = ctx->base;
const U32 target = (U32)(ip - base);
U32 idx = ctx->nextToUpdate;
while(idx < target)
idx += LZ4HC_BinTree_InsertAndGetAllMatches(ctx, base+idx, iHighLimit, 8, NULL, NULL);
}
/** Tree updater, providing best match */
FORCE_INLINE int LZ4HC_BinTree_GetAllMatches (
LZ4HC_CCtx_internal* ctx,
const BYTE* const ip, const BYTE* const iHighLimit,
size_t best_mlen, LZ4HC_match_t* matches, const int fullUpdate)
{
int mnum = 0;
if (ip < ctx->base + ctx->nextToUpdate) return 0; /* skipped area */
if (fullUpdate) LZ4HC_updateBinTree(ctx, ip, iHighLimit);
best_mlen = LZ4HC_BinTree_InsertAndGetAllMatches(ctx, ip, iHighLimit, best_mlen, matches, &mnum);
ctx->nextToUpdate = (U32)(ip - ctx->base + best_mlen);
return mnum;
}
#define SET_PRICE(pos, ml, offset, ll, cost) \
{ \
while (last_pos < pos) { opt[last_pos+1].price = 1<<30; last_pos++; } \
opt[pos].mlen = (int)ml; \
opt[pos].off = (int)offset; \
opt[pos].litlen = (int)ll; \
opt[pos].price = (int)cost; \
}
static int LZ4HC_compress_optimal (
LZ4HC_CCtx_internal* ctx,
const char* const source,
char* dest,
int inputSize,
int maxOutputSize,
limitedOutput_directive limit,
size_t sufficient_len,
const int fullUpdate
)
{
LZ4HC_optimal_t opt[LZ4_OPT_NUM + 1]; /* this uses a bit too much stack memory to my taste ... */
LZ4HC_match_t matches[LZ4_OPT_NUM + 1];
const BYTE* ip = (const BYTE*) source;
const BYTE* anchor = ip;
const BYTE* const iend = ip + inputSize;
const BYTE* const mflimit = iend - MFLIMIT;
const BYTE* const matchlimit = (iend - LASTLITERALS);
BYTE* op = (BYTE*) dest;
BYTE* const oend = op + maxOutputSize;
/* init */
DEBUGLOG(5, "LZ4HC_compress_optimal");
if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
ctx->end += inputSize;
ip++;
/* Main Loop */
while (ip < mflimit) {
size_t const llen = ip - anchor;
size_t last_pos = 0;
size_t match_num, cur, best_mlen, best_off;
memset(opt, 0, sizeof(LZ4HC_optimal_t)); /* memset only the first one */
match_num = LZ4HC_BinTree_GetAllMatches(ctx, ip, matchlimit, MINMATCH-1, matches, fullUpdate);
if (!match_num) { ip++; continue; }
if ((size_t)matches[match_num-1].len > sufficient_len) {
/* good enough solution : immediate encoding */
best_mlen = matches[match_num-1].len;
best_off = matches[match_num-1].off;
cur = 0;
last_pos = 1;
goto encode;
}
/* set prices using matches at position = 0 */
{ size_t matchNb;
for (matchNb = 0; matchNb < match_num; matchNb++) {
size_t mlen = (matchNb>0) ? (size_t)matches[matchNb-1].len+1 : MINMATCH;
best_mlen = matches[matchNb].len; /* necessarily < sufficient_len < LZ4_OPT_NUM */
for ( ; mlen <= best_mlen ; mlen++) {
size_t const cost = LZ4HC_sequencePrice(llen, mlen) - LZ4HC_literalsPrice(llen);
SET_PRICE(mlen, mlen, matches[matchNb].off, 0, cost); /* updates last_pos and opt[pos] */
} } }
if (last_pos < MINMATCH) { ip++; continue; } /* note : on clang at least, this test improves performance */
/* check further positions */
opt[0].mlen = opt[1].mlen = 1;
for (cur = 1; cur <= last_pos; cur++) {
const BYTE* const curPtr = ip + cur;
/* establish baseline price if cur is literal */
{ size_t price, litlen;
if (opt[cur-1].mlen == 1) {
/* no match at previous position */
litlen = opt[cur-1].litlen + 1;
if (cur > litlen) {
price = opt[cur - litlen].price + LZ4HC_literalsPrice(litlen);
} else {
price = LZ4HC_literalsPrice(llen + litlen) - LZ4HC_literalsPrice(llen);
}
} else {
litlen = 1;
price = opt[cur - 1].price + LZ4HC_literalsPrice(1);
}
if (price < (size_t)opt[cur].price)
SET_PRICE(cur, 1 /*mlen*/, 0 /*off*/, litlen, price); /* note : increases last_pos */
}
if (cur == last_pos || curPtr >= mflimit) break;
match_num = LZ4HC_BinTree_GetAllMatches(ctx, curPtr, matchlimit, MINMATCH-1, matches, fullUpdate);
if ((match_num > 0) && (size_t)matches[match_num-1].len > sufficient_len) {
/* immediate encoding */
best_mlen = matches[match_num-1].len;
best_off = matches[match_num-1].off;
last_pos = cur + 1;
goto encode;
}
/* set prices using matches at position = cur */
{ size_t matchNb;
for (matchNb = 0; matchNb < match_num; matchNb++) {
size_t ml = (matchNb>0) ? (size_t)matches[matchNb-1].len+1 : MINMATCH;
best_mlen = (cur + matches[matchNb].len < LZ4_OPT_NUM) ?
(size_t)matches[matchNb].len : LZ4_OPT_NUM - cur;
for ( ; ml <= best_mlen ; ml++) {
size_t ll, price;
if (opt[cur].mlen == 1) {
ll = opt[cur].litlen;
if (cur > ll)
price = opt[cur - ll].price + LZ4HC_sequencePrice(ll, ml);
else
price = LZ4HC_sequencePrice(llen + ll, ml) - LZ4HC_literalsPrice(llen);
} else {
ll = 0;
price = opt[cur].price + LZ4HC_sequencePrice(0, ml);
}
if (cur + ml > last_pos || price < (size_t)opt[cur + ml].price) {
SET_PRICE(cur + ml, ml, matches[matchNb].off, ll, price);
} } } }
} /* for (cur = 1; cur <= last_pos; cur++) */
best_mlen = opt[last_pos].mlen;
best_off = opt[last_pos].off;
cur = last_pos - best_mlen;
encode: /* cur, last_pos, best_mlen, best_off must be set */
opt[0].mlen = 1;
while (1) { /* from end to beginning */
size_t const ml = opt[cur].mlen;
int const offset = opt[cur].off;
opt[cur].mlen = (int)best_mlen;
opt[cur].off = (int)best_off;
best_mlen = ml;
best_off = offset;
if (ml > cur) break; /* can this happen ? */
cur -= ml;
}
/* encode all recorded sequences */
cur = 0;
while (cur < last_pos) {
int const ml = opt[cur].mlen;
int const offset = opt[cur].off;
if (ml == 1) { ip++; cur++; continue; }
cur += ml;
if ( LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ip - offset, limit, oend) ) return 0;
}
} /* while (ip < mflimit) */
/* Encode Last Literals */
{ int lastRun = (int)(iend - anchor);
if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; /* Check output limit */
if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
else *op++ = (BYTE)(lastRun<<ML_BITS);
memcpy(op, anchor, iend - anchor);
op += iend-anchor;
}
/* End */
return (int) ((char*)op-dest);
}