lz4: Update our internal copy to release r131
Clang and GCC optimizations and bug fixes. Have a look at the NEWS file for more details.
This commit is contained in:
Stefan Schmidt
parent
1243b24f9b
commit
1872c06ff0
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@ -1,19 +1,44 @@
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r131
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New : Dos/DJGPP target, thanks to Louis Santillan (#114)
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Added : Example using lz4frame library, by Zbigniew Jędrzejewski-Szmek (#118)
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Changed: xxhash symbols are modified (namespace emulation) within liblz4
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r130:
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Fixed : incompatibility sparse mode vs console, reported by Yongwoon Cho (#105)
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Fixed : LZ4IO exits too early when frame crc not present, reported by Yongwoon Cho (#106)
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Fixed : incompatibility sparse mode vs append mode, reported by Takayuki Matsuoka (#110)
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Performance fix : big compression speed boost for clang (+30%)
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New : cross-version test, by Takayuki Matsuoka
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r129:
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Added : LZ4_compress_fast(), LZ4_compress_fast_continue()
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Added : LZ4_compress_destSize()
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Changed: New lz4 and lz4hc compression API. Previous function prototypes still supported.
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Changed: Sparse file support enabled by default
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New : LZ4 CLI improved performance compressing/decompressing multiple files (#86, kind contribution from Kyle J. Harper & Takayuki Matsuoka)
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Fixed : GCC 4.9+ optimization bug - Reported by Markus Trippelsdorf, Greg Slazinski & Evan Nemerson
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Changed: Enums converted to LZ4F_ namespace convention - by Takayuki Matsuoka
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Added : AppVeyor CI environment, for Visual tests - Suggested by Takayuki Matsuoka
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Modified:Obsolete functions generate warnings - Suggested by Evan Nemerson, contributed by Takayuki Matsuoka
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Fixed : Bug #75 (unfinished stream), reported by Yongwoon Cho
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Updated: Documentation converted to MarkDown format
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r128:
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New : lz4cli sparse file support
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New : command -m, to compress multiple files in a single command
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Fixed : Restored lz4hc compression ratio (was slightly lower since r124)
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New : lz4 cli supports long commands
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New : lz4frame & lz4cli frame content size support
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New : lz4frame supports skippable frames
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Changed:Default "make install" directory is /usr/local
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New : lz4 cli supports "pass-through" mode
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New : datagen can generate sparse files
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New : scan-build tests
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New : g++ compatibility tests
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New : arm cross-compilation test
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Fixed : Fuzzer + frametest compatibility with NetBSD (issue #48)
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Added : Visual project directory
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Updated:Man page & Specification
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New : lz4cli sparse file support (Requested by Neil Wilson, and contributed by Takayuki Matsuoka)
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New : command -m, to compress multiple files in a single command (suggested by Kyle J. Harper)
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Fixed : Restored lz4hc compression ratio (slightly lower since r124)
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New : lz4 cli supports long commands (suggested by Takayuki Matsuoka)
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New : lz4frame & lz4cli frame content size support
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New : lz4frame supports skippable frames, as requested by Sergey Cherepanov
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Changed: Default "make install" directory is /usr/local, as notified by Ron Johnson
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New : lz4 cli supports "pass-through" mode, requested by Neil Wilson
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New : datagen can generate sparse files
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New : scan-build tests, thanks to kind help by Takayuki Matsuoka
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New : g++ compatibility tests
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New : arm cross-compilation test, thanks to kind help by Takayuki Matsuoka
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Fixed : Fuzzer + frametest compatibility with NetBSD (issue #48, reported by Thomas Klausner)
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Added : Visual project directory
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Updated: Man page & Specification
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r127:
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N/A : added a file on SVN
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@ -1,15 +1,16 @@
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LZ4 - Library Files
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================================
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This directory contains many files, but you don't necessarily need them all.
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The __lib__ directory contains several files, but you don't necessarily need them all.
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If you want to integrate LZ4 compression/decompression into your program, you basically need to include "**lz4.c**" and "**lz4.h**" only.
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To integrate fast LZ4 compression/decompression into your program, you basically just need "**lz4.c**" and "**lz4.h**".
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If you want more compression, at the cost of compression speed (but preserving decompression speed), you will also have to include "**lz4hc.c**" and "**lz4hc.h**". Note that lz4hc needs lz4 to work properly.
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For more compression at the cost of compression speed (while preserving decompression speed), use **lz4hc** on top of regular lz4. `lz4hc` only provides compression functions. It also needs `lz4` to compile properly.
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Next level, if you want to produce files or data streams compatible with lz4 utility, you will have to use and include "**lz4frame.c**" and **lz4frame.h**". This library encapsulate lz4-compressed blocks into the official interoperable frame format. In order to work properly, lz4frame needs lz4 and lz4hc, and also "**xxhash.c**" and "**xxhash.h**", which provide the error detection algorithm.
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If you want to produce files or data streams compatible with `lz4` command line utility, use **lz4frame**. This library encapsulates lz4-compressed blocks into the [official interoperable frame format]. In order to work properly, lz4frame needs lz4 and lz4hc, and also **xxhash**, which provides error detection algorithm.
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(_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.)
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A more complex "lz4frame_static.h" is also provided, although its usage is not recommended. It contains definitions which are not guaranteed to remain stable within future versions. Use only if you don't plan to update your lz4 version.
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A more complex "lz4frame_static.h" is also provided, although its usage is not recommended. It contains definitions which are not guaranteed to remain stable within future versions. Use for static linking ***only***.
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The other files are not source code. There are :
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@ -17,3 +18,4 @@ The other files are not source code. There are :
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- Makefile : script to compile or install lz4 library (static or dynamic)
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- liblz4.pc.in : for pkg-config (make install)
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[official interoperable frame format]: ../lz4_Frame_format.md
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@ -34,7 +34,7 @@
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/**************************************
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Tuning parameters
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* Tuning parameters
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**************************************/
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/*
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* HEAPMODE :
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@ -44,50 +44,15 @@
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#define HEAPMODE 0
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/*
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* CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS :
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* By default, the source code expects the compiler to correctly optimize
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* 4-bytes and 8-bytes read on architectures able to handle it efficiently.
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* This is not always the case. In some circumstances (ARM notably),
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* the compiler will issue cautious code even when target is able to correctly handle unaligned memory accesses.
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*
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* You can force the compiler to use unaligned memory access by uncommenting the line below.
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* One of the below scenarios will happen :
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* 1 - Your target CPU correctly handle unaligned access, and was not well optimized by compiler (good case).
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* You will witness large performance improvements (+50% and up).
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* Keep the line uncommented and send a word to upstream (https://groups.google.com/forum/#!forum/lz4c)
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* The goal is to automatically detect such situations by adding your target CPU within an exception list.
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* 2 - Your target CPU correctly handle unaligned access, and was already already optimized by compiler
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* No change will be experienced.
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* 3 - Your target CPU inefficiently handle unaligned access.
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* You will experience a performance loss. Comment back the line.
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* 4 - Your target CPU does not handle unaligned access.
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* Program will crash.
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* If uncommenting results in better performance (case 1)
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* please report your configuration to upstream (https://groups.google.com/forum/#!forum/lz4c)
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* This way, an automatic detection macro can be added to match your case within later versions of the library.
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* ACCELERATION_DEFAULT :
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* Select "acceleration" for LZ4_compress_fast() when parameter value <= 0
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*/
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/* #define CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS 1 */
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#define ACCELERATION_DEFAULT 1
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/**************************************
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CPU Feature Detection
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* CPU Feature Detection
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**************************************/
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/*
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* Automated efficient unaligned memory access detection
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* Based on known hardware architectures
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* This list will be updated thanks to feedbacks
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*/
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#if defined(CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS) \
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|| defined(__ARM_FEATURE_UNALIGNED) \
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|| defined(__i386__) || defined(__x86_64__) \
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|| defined(_M_IX86) || defined(_M_X64) \
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|| defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) \
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|| (defined(_M_ARM) && (_M_ARM >= 7))
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# define LZ4_UNALIGNED_ACCESS 1
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#else
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# define LZ4_UNALIGNED_ACCESS 0
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#endif
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/*
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* LZ4_FORCE_SW_BITCOUNT
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* Define this parameter if your target system or compiler does not support hardware bit count
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#endif
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/**************************************
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* Includes
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**************************************/
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#include "lz4.h"
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/**************************************
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* Compiler Options
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**************************************/
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#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
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/* "restrict" is a known keyword */
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#else
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# define restrict /* Disable restrict */
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#endif
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#ifdef _MSC_VER /* Visual Studio */
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# define FORCE_INLINE static __forceinline
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# include <intrin.h>
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# pragma warning(disable : 4293) /* disable: C4293: too large shift (32-bits) */
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#else
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# if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
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# ifdef __GNUC__
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# if defined(__GNUC__) || defined(__clang__)
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# define FORCE_INLINE static inline __attribute__((always_inline))
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# else
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# define FORCE_INLINE static inline
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# endif /* __STDC_VERSION__ */
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#endif /* _MSC_VER */
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#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
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#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
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/* LZ4_GCC_VERSION is defined into lz4.h */
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#if (LZ4_GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
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# define expect(expr,value) (__builtin_expect ((expr),(value)) )
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#else
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# define expect(expr,value) (expr)
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/**************************************
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Memory routines
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* Memory routines
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**************************************/
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#include <stdlib.h> /* malloc, calloc, free */
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#define ALLOCATOR(n,s) calloc(n,s)
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/**************************************
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Includes
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**************************************/
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#include "lz4.h"
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/**************************************
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Basic Types
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* Basic Types
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**************************************/
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#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
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# include <stdint.h>
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@ -171,7 +129,7 @@
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/**************************************
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Reading and writing into memory
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* Reading and writing into memory
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**************************************/
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#define STEPSIZE sizeof(size_t)
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@ -184,10 +142,19 @@ static unsigned LZ4_isLittleEndian(void)
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}
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static U16 LZ4_read16(const void* memPtr)
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{
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U16 val16;
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memcpy(&val16, memPtr, 2);
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return val16;
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}
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static U16 LZ4_readLE16(const void* memPtr)
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{
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if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian()))
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return *(U16*)memPtr;
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if (LZ4_isLittleEndian())
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{
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return LZ4_read16(memPtr);
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}
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else
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{
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const BYTE* p = (const BYTE*)memPtr;
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@ -197,10 +164,9 @@ static U16 LZ4_readLE16(const void* memPtr)
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static void LZ4_writeLE16(void* memPtr, U16 value)
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{
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if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian()))
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if (LZ4_isLittleEndian())
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{
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*(U16*)memPtr = value;
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return;
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memcpy(memPtr, &value, 2);
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}
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else
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{
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@ -210,41 +176,18 @@ static void LZ4_writeLE16(void* memPtr, U16 value)
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}
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}
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static U16 LZ4_read16(const void* memPtr)
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{
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if (LZ4_UNALIGNED_ACCESS)
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return *(U16*)memPtr;
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else
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{
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U16 val16;
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memcpy(&val16, memPtr, 2);
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return val16;
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}
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}
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static U32 LZ4_read32(const void* memPtr)
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{
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if (LZ4_UNALIGNED_ACCESS)
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return *(U32*)memPtr;
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else
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{
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U32 val32;
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memcpy(&val32, memPtr, 4);
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return val32;
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}
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U32 val32;
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memcpy(&val32, memPtr, 4);
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return val32;
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}
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static U64 LZ4_read64(const void* memPtr)
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{
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if (LZ4_UNALIGNED_ACCESS)
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return *(U64*)memPtr;
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else
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{
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U64 val64;
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memcpy(&val64, memPtr, 8);
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return val64;
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}
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U64 val64;
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memcpy(&val64, memPtr, 8);
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return val64;
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}
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static size_t LZ4_read_ARCH(const void* p)
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@ -256,31 +199,9 @@ static size_t LZ4_read_ARCH(const void* p)
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}
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static void LZ4_copy4(void* dstPtr, const void* srcPtr)
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{
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if (LZ4_UNALIGNED_ACCESS)
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{
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*(U32*)dstPtr = *(U32*)srcPtr;
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return;
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}
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memcpy(dstPtr, srcPtr, 4);
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}
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static void LZ4_copy4(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 4); }
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static void LZ4_copy8(void* dstPtr, const void* srcPtr)
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{
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#if GCC_VERSION!=409 /* disabled on GCC 4.9, as it generates invalid opcode (crash) */
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if (LZ4_UNALIGNED_ACCESS)
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{
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if (LZ4_64bits())
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*(U64*)dstPtr = *(U64*)srcPtr;
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else
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((U32*)dstPtr)[0] = ((U32*)srcPtr)[0],
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((U32*)dstPtr)[1] = ((U32*)srcPtr)[1];
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return;
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}
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#endif
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memcpy(dstPtr, srcPtr, 8);
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}
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static void LZ4_copy8(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 8); }
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/* customized version of memcpy, which may overwrite up to 7 bytes beyond dstEnd */
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static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd)
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@ -293,7 +214,7 @@ static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd)
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/**************************************
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Common Constants
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* Common Constants
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**************************************/
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#define MINMATCH 4
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@ -334,7 +255,7 @@ static unsigned LZ4_NbCommonBytes (register size_t val)
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unsigned long r = 0;
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_BitScanForward64( &r, (U64)val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_ctzll((U64)val) >> 3);
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# else
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static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
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@ -347,7 +268,7 @@ static unsigned LZ4_NbCommonBytes (register size_t val)
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unsigned long r;
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_BitScanForward( &r, (U32)val );
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return (int)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_ctz((U32)val) >> 3);
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# else
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static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
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@ -363,8 +284,8 @@ static unsigned LZ4_NbCommonBytes (register size_t val)
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unsigned long r = 0;
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_BitScanReverse64( &r, val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clzll(val) >> 3);
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# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clzll((U64)val) >> 3);
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# else
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unsigned r;
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if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
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@ -379,8 +300,8 @@ static unsigned LZ4_NbCommonBytes (register size_t val)
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unsigned long r = 0;
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_BitScanReverse( &r, (unsigned long)val );
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return (unsigned)(r>>3);
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# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clz(val) >> 3);
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# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
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return (__builtin_clz((U32)val) >> 3);
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# else
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unsigned r;
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if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
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@ -422,13 +343,6 @@ static const int LZ4_64Klimit = ((64 KB) + (MFLIMIT-1));
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static const U32 LZ4_skipTrigger = 6; /* Increase this value ==> compression run slower on incompressible data */
|
||||
|
||||
|
||||
/**************************************
|
||||
* Local Utils
|
||||
**************************************/
|
||||
int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; }
|
||||
int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); }
|
||||
|
||||
|
||||
/**************************************
|
||||
* Local Structures and types
|
||||
**************************************/
|
||||
|
|
@ -437,7 +351,7 @@ typedef struct {
|
|||
U32 currentOffset;
|
||||
U32 initCheck;
|
||||
const BYTE* dictionary;
|
||||
const BYTE* bufferStart;
|
||||
BYTE* bufferStart; /* obsolete, used for slideInputBuffer */
|
||||
U32 dictSize;
|
||||
} LZ4_stream_t_internal;
|
||||
|
||||
|
|
@ -451,6 +365,14 @@ typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive;
|
|||
typedef enum { full = 0, partial = 1 } earlyEnd_directive;
|
||||
|
||||
|
||||
/**************************************
|
||||
* Local Utils
|
||||
**************************************/
|
||||
int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; }
|
||||
int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); }
|
||||
int LZ4_sizeofState() { return LZ4_STREAMSIZE; }
|
||||
|
||||
|
||||
|
||||
/********************************
|
||||
* Compression functions
|
||||
|
|
@ -464,7 +386,22 @@ static U32 LZ4_hashSequence(U32 sequence, tableType_t const tableType)
|
|||
return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG));
|
||||
}
|
||||
|
||||
static U32 LZ4_hashPosition(const BYTE* p, tableType_t tableType) { return LZ4_hashSequence(LZ4_read32(p), tableType); }
|
||||
static const U64 prime5bytes = 889523592379ULL;
|
||||
static U32 LZ4_hashSequence64(size_t sequence, tableType_t const tableType)
|
||||
{
|
||||
const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG+1 : LZ4_HASHLOG;
|
||||
const U32 hashMask = (1<<hashLog) - 1;
|
||||
return ((sequence * prime5bytes) >> (40 - hashLog)) & hashMask;
|
||||
}
|
||||
|
||||
static U32 LZ4_hashSequenceT(size_t sequence, tableType_t const tableType)
|
||||
{
|
||||
if (LZ4_64bits())
|
||||
return LZ4_hashSequence64(sequence, tableType);
|
||||
return LZ4_hashSequence((U32)sequence, tableType);
|
||||
}
|
||||
|
||||
static U32 LZ4_hashPosition(const void* p, tableType_t tableType) { return LZ4_hashSequenceT(LZ4_read_ARCH(p), tableType); }
|
||||
|
||||
static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t const tableType, const BYTE* srcBase)
|
||||
{
|
||||
|
|
@ -495,16 +432,17 @@ static const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t t
|
|||
return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase);
|
||||
}
|
||||
|
||||
static int LZ4_compress_generic(
|
||||
void* ctx,
|
||||
const char* source,
|
||||
char* dest,
|
||||
int inputSize,
|
||||
int maxOutputSize,
|
||||
limitedOutput_directive outputLimited,
|
||||
tableType_t const tableType,
|
||||
dict_directive dict,
|
||||
dictIssue_directive dictIssue)
|
||||
FORCE_INLINE int LZ4_compress_generic(
|
||||
void* const ctx,
|
||||
const char* const source,
|
||||
char* const dest,
|
||||
const int inputSize,
|
||||
const int maxOutputSize,
|
||||
const limitedOutput_directive outputLimited,
|
||||
const tableType_t tableType,
|
||||
const dict_directive dict,
|
||||
const dictIssue_directive dictIssue,
|
||||
const U32 acceleration)
|
||||
{
|
||||
LZ4_stream_t_internal* const dictPtr = (LZ4_stream_t_internal*)ctx;
|
||||
|
||||
|
|
@ -527,7 +465,7 @@ static int LZ4_compress_generic(
|
|||
size_t refDelta=0;
|
||||
|
||||
/* Init conditions */
|
||||
if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
|
||||
if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
|
||||
switch(dict)
|
||||
{
|
||||
case noDict:
|
||||
|
|
@ -558,15 +496,15 @@ static int LZ4_compress_generic(
|
|||
BYTE* token;
|
||||
{
|
||||
const BYTE* forwardIp = ip;
|
||||
unsigned step=1;
|
||||
unsigned searchMatchNb = (1U << LZ4_skipTrigger);
|
||||
unsigned step = 1;
|
||||
unsigned searchMatchNb = acceleration << LZ4_skipTrigger;
|
||||
|
||||
/* Find a match */
|
||||
do {
|
||||
U32 h = forwardH;
|
||||
ip = forwardIp;
|
||||
forwardIp += step;
|
||||
step = searchMatchNb++ >> LZ4_skipTrigger;
|
||||
step = (searchMatchNb++ >> LZ4_skipTrigger);
|
||||
|
||||
if (unlikely(forwardIp > mflimit)) goto _last_literals;
|
||||
|
||||
|
|
@ -693,13 +631,22 @@ _next_match:
|
|||
_last_literals:
|
||||
/* Encode Last Literals */
|
||||
{
|
||||
int lastRun = (int)(iend - anchor);
|
||||
if ((outputLimited) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize))
|
||||
const size_t lastRun = (size_t)(iend - anchor);
|
||||
if ((outputLimited) && ((op - (BYTE*)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 >= 255 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
|
||||
else *op++ = (BYTE)(lastRun<<ML_BITS);
|
||||
memcpy(op, anchor, iend - anchor);
|
||||
op += iend-anchor;
|
||||
if (lastRun >= RUN_MASK)
|
||||
{
|
||||
size_t accumulator = lastRun - RUN_MASK;
|
||||
*op++ = RUN_MASK << ML_BITS;
|
||||
for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
|
||||
*op++ = (BYTE) accumulator;
|
||||
}
|
||||
else
|
||||
{
|
||||
*op++ = (BYTE)(lastRun<<ML_BITS);
|
||||
}
|
||||
memcpy(op, anchor, lastRun);
|
||||
op += lastRun;
|
||||
}
|
||||
|
||||
/* End */
|
||||
|
|
@ -707,39 +654,271 @@ _last_literals:
|
|||
}
|
||||
|
||||
|
||||
int LZ4_compress(const char* source, char* dest, int inputSize)
|
||||
int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
|
||||
{
|
||||
LZ4_resetStream((LZ4_stream_t*)state);
|
||||
if (acceleration < 1) acceleration = ACCELERATION_DEFAULT;
|
||||
|
||||
if (maxOutputSize >= LZ4_compressBound(inputSize))
|
||||
{
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue, acceleration);
|
||||
else
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
|
||||
else
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int LZ4_compress_fast(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
|
||||
{
|
||||
#if (HEAPMODE)
|
||||
void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U64, 8); /* Aligned on 8-bytes boundaries */
|
||||
void* ctxPtr = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */
|
||||
#else
|
||||
U64 ctx[LZ4_STREAMSIZE_U64] = {0}; /* Ensure data is aligned on 8-bytes boundaries */
|
||||
LZ4_stream_t ctx;
|
||||
void* ctxPtr = &ctx;
|
||||
#endif
|
||||
int result;
|
||||
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue);
|
||||
else
|
||||
result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue);
|
||||
int result = LZ4_compress_fast_extState(ctxPtr, source, dest, inputSize, maxOutputSize, acceleration);
|
||||
|
||||
#if (HEAPMODE)
|
||||
FREEMEM(ctx);
|
||||
FREEMEM(ctxPtr);
|
||||
#endif
|
||||
return result;
|
||||
}
|
||||
|
||||
int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
|
||||
int LZ4_compress_default(const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
#if (HEAPMODE)
|
||||
void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U64, 8); /* Aligned on 8-bytes boundaries */
|
||||
#else
|
||||
U64 ctx[LZ4_STREAMSIZE_U64] = {0}; /* Ensure data is aligned on 8-bytes boundaries */
|
||||
#endif
|
||||
int result;
|
||||
return LZ4_compress_fast(source, dest, inputSize, maxOutputSize, 1);
|
||||
}
|
||||
|
||||
|
||||
/* hidden debug function */
|
||||
/* strangely enough, gcc generates faster code when this function is uncommented, even if unused */
|
||||
int LZ4_compress_fast_force(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
|
||||
{
|
||||
LZ4_stream_t ctx;
|
||||
|
||||
LZ4_resetStream(&ctx);
|
||||
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue);
|
||||
return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
|
||||
else
|
||||
result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue);
|
||||
return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
|
||||
}
|
||||
|
||||
|
||||
/********************************
|
||||
* destSize variant
|
||||
********************************/
|
||||
|
||||
static int LZ4_compress_destSize_generic(
|
||||
void* const ctx,
|
||||
const char* const src,
|
||||
char* const dst,
|
||||
int* const srcSizePtr,
|
||||
const int targetDstSize,
|
||||
const tableType_t tableType)
|
||||
{
|
||||
const BYTE* ip = (const BYTE*) src;
|
||||
const BYTE* base = (const BYTE*) src;
|
||||
const BYTE* lowLimit = (const BYTE*) src;
|
||||
const BYTE* anchor = ip;
|
||||
const BYTE* const iend = ip + *srcSizePtr;
|
||||
const BYTE* const mflimit = iend - MFLIMIT;
|
||||
const BYTE* const matchlimit = iend - LASTLITERALS;
|
||||
|
||||
BYTE* op = (BYTE*) dst;
|
||||
BYTE* const oend = op + targetDstSize;
|
||||
BYTE* const oMaxLit = op + targetDstSize - 2 /* offset */ - 8 /* because 8+MINMATCH==MFLIMIT */ - 1 /* token */;
|
||||
BYTE* const oMaxMatch = op + targetDstSize - (LASTLITERALS + 1 /* token */);
|
||||
BYTE* const oMaxSeq = oMaxLit - 1 /* token */;
|
||||
|
||||
U32 forwardH;
|
||||
|
||||
|
||||
/* Init conditions */
|
||||
if (targetDstSize < 1) return 0; /* Impossible to store anything */
|
||||
if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
|
||||
if ((tableType == byU16) && (*srcSizePtr>=LZ4_64Klimit)) return 0; /* Size too large (not within 64K limit) */
|
||||
if (*srcSizePtr<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
|
||||
|
||||
/* First Byte */
|
||||
*srcSizePtr = 0;
|
||||
LZ4_putPosition(ip, ctx, tableType, base);
|
||||
ip++; forwardH = LZ4_hashPosition(ip, tableType);
|
||||
|
||||
/* Main Loop */
|
||||
for ( ; ; )
|
||||
{
|
||||
const BYTE* match;
|
||||
BYTE* token;
|
||||
{
|
||||
const BYTE* forwardIp = ip;
|
||||
unsigned step = 1;
|
||||
unsigned searchMatchNb = 1 << LZ4_skipTrigger;
|
||||
|
||||
/* Find a match */
|
||||
do {
|
||||
U32 h = forwardH;
|
||||
ip = forwardIp;
|
||||
forwardIp += step;
|
||||
step = (searchMatchNb++ >> LZ4_skipTrigger);
|
||||
|
||||
if (unlikely(forwardIp > mflimit))
|
||||
goto _last_literals;
|
||||
|
||||
match = LZ4_getPositionOnHash(h, ctx, tableType, base);
|
||||
forwardH = LZ4_hashPosition(forwardIp, tableType);
|
||||
LZ4_putPositionOnHash(ip, h, ctx, tableType, base);
|
||||
|
||||
} while ( ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip))
|
||||
|| (LZ4_read32(match) != LZ4_read32(ip)) );
|
||||
}
|
||||
|
||||
/* Catch up */
|
||||
while ((ip>anchor) && (match > lowLimit) && (unlikely(ip[-1]==match[-1]))) { ip--; match--; }
|
||||
|
||||
{
|
||||
/* Encode Literal length */
|
||||
unsigned litLength = (unsigned)(ip - anchor);
|
||||
token = op++;
|
||||
if (op + ((litLength+240)/255) + litLength > oMaxLit)
|
||||
{
|
||||
/* Not enough space for a last match */
|
||||
op--;
|
||||
goto _last_literals;
|
||||
}
|
||||
if (litLength>=RUN_MASK)
|
||||
{
|
||||
unsigned len = litLength - RUN_MASK;
|
||||
*token=(RUN_MASK<<ML_BITS);
|
||||
for(; len >= 255 ; len-=255) *op++ = 255;
|
||||
*op++ = (BYTE)len;
|
||||
}
|
||||
else *token = (BYTE)(litLength<<ML_BITS);
|
||||
|
||||
/* Copy Literals */
|
||||
LZ4_wildCopy(op, anchor, op+litLength);
|
||||
op += litLength;
|
||||
}
|
||||
|
||||
_next_match:
|
||||
/* Encode Offset */
|
||||
LZ4_writeLE16(op, (U16)(ip-match)); op+=2;
|
||||
|
||||
/* Encode MatchLength */
|
||||
{
|
||||
size_t matchLength;
|
||||
|
||||
matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit);
|
||||
|
||||
if (op + ((matchLength+240)/255) > oMaxMatch)
|
||||
{
|
||||
/* Match description too long : reduce it */
|
||||
matchLength = (15-1) + (oMaxMatch-op) * 255;
|
||||
}
|
||||
//printf("offset %5i, matchLength%5i \n", (int)(ip-match), matchLength + MINMATCH);
|
||||
ip += MINMATCH + matchLength;
|
||||
|
||||
if (matchLength>=ML_MASK)
|
||||
{
|
||||
*token += ML_MASK;
|
||||
matchLength -= ML_MASK;
|
||||
while (matchLength >= 255) { matchLength-=255; *op++ = 255; }
|
||||
*op++ = (BYTE)matchLength;
|
||||
}
|
||||
else *token += (BYTE)(matchLength);
|
||||
}
|
||||
|
||||
anchor = ip;
|
||||
|
||||
/* Test end of block */
|
||||
if (ip > mflimit) break;
|
||||
if (op > oMaxSeq) break;
|
||||
|
||||
/* Fill table */
|
||||
LZ4_putPosition(ip-2, ctx, tableType, base);
|
||||
|
||||
/* Test next position */
|
||||
match = LZ4_getPosition(ip, ctx, tableType, base);
|
||||
LZ4_putPosition(ip, ctx, tableType, base);
|
||||
if ( (match+MAX_DISTANCE>=ip)
|
||||
&& (LZ4_read32(match)==LZ4_read32(ip)) )
|
||||
{ token=op++; *token=0; goto _next_match; }
|
||||
|
||||
/* Prepare next loop */
|
||||
forwardH = LZ4_hashPosition(++ip, tableType);
|
||||
}
|
||||
|
||||
_last_literals:
|
||||
/* Encode Last Literals */
|
||||
{
|
||||
size_t lastRunSize = (size_t)(iend - anchor);
|
||||
if (op + 1 /* token */ + ((lastRunSize+240)/255) /* litLength */ + lastRunSize /* literals */ > oend)
|
||||
{
|
||||
/* adapt lastRunSize to fill 'dst' */
|
||||
lastRunSize = (oend-op) - 1;
|
||||
lastRunSize -= (lastRunSize+240)/255;
|
||||
}
|
||||
ip = anchor + lastRunSize;
|
||||
|
||||
if (lastRunSize >= RUN_MASK)
|
||||
{
|
||||
size_t accumulator = lastRunSize - RUN_MASK;
|
||||
*op++ = RUN_MASK << ML_BITS;
|
||||
for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
|
||||
*op++ = (BYTE) accumulator;
|
||||
}
|
||||
else
|
||||
{
|
||||
*op++ = (BYTE)(lastRunSize<<ML_BITS);
|
||||
}
|
||||
memcpy(op, anchor, lastRunSize);
|
||||
op += lastRunSize;
|
||||
}
|
||||
|
||||
/* End */
|
||||
*srcSizePtr = (int) (((const char*)ip)-src);
|
||||
return (int) (((char*)op)-dst);
|
||||
}
|
||||
|
||||
|
||||
static int LZ4_compress_destSize_extState (void* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize)
|
||||
{
|
||||
LZ4_resetStream((LZ4_stream_t*)state);
|
||||
|
||||
if (targetDstSize >= LZ4_compressBound(*srcSizePtr)) /* compression success is guaranteed */
|
||||
{
|
||||
return LZ4_compress_fast_extState(state, src, dst, *srcSizePtr, targetDstSize, 1);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (*srcSizePtr < LZ4_64Klimit)
|
||||
return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, byU16);
|
||||
else
|
||||
return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, LZ4_64bits() ? byU32 : byPtr);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int LZ4_compress_destSize(const char* src, char* dst, int* srcSizePtr, int targetDstSize)
|
||||
{
|
||||
#if (HEAPMODE)
|
||||
void* ctx = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */
|
||||
#else
|
||||
LZ4_stream_t ctxBody;
|
||||
void* ctx = &ctxBody;
|
||||
#endif
|
||||
|
||||
int result = LZ4_compress_destSize_extState(ctx, src, dst, srcSizePtr, targetDstSize);
|
||||
|
||||
#if (HEAPMODE)
|
||||
FREEMEM(ctx);
|
||||
|
|
@ -748,19 +927,10 @@ int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, in
|
|||
}
|
||||
|
||||
|
||||
/*****************************************
|
||||
* Experimental : Streaming functions
|
||||
*****************************************/
|
||||
|
||||
/*
|
||||
* LZ4_initStream
|
||||
* Use this function once, to init a newly allocated LZ4_stream_t structure
|
||||
* Return : 1 if OK, 0 if error
|
||||
*/
|
||||
void LZ4_resetStream (LZ4_stream_t* LZ4_stream)
|
||||
{
|
||||
MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t));
|
||||
}
|
||||
/********************************
|
||||
* Streaming functions
|
||||
********************************/
|
||||
|
||||
LZ4_stream_t* LZ4_createStream(void)
|
||||
{
|
||||
|
|
@ -770,6 +940,11 @@ LZ4_stream_t* LZ4_createStream(void)
|
|||
return lz4s;
|
||||
}
|
||||
|
||||
void LZ4_resetStream (LZ4_stream_t* LZ4_stream)
|
||||
{
|
||||
MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t));
|
||||
}
|
||||
|
||||
int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
|
||||
{
|
||||
FREEMEM(LZ4_stream);
|
||||
|
|
@ -777,6 +952,7 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
|
|||
}
|
||||
|
||||
|
||||
#define HASH_UNIT sizeof(size_t)
|
||||
int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
|
||||
{
|
||||
LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict;
|
||||
|
|
@ -784,24 +960,26 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
|
|||
const BYTE* const dictEnd = p + dictSize;
|
||||
const BYTE* base;
|
||||
|
||||
if (dict->initCheck) LZ4_resetStream(LZ4_dict); /* Uninitialized structure detected */
|
||||
if ((dict->initCheck) || (dict->currentOffset > 1 GB)) /* Uninitialized structure, or reuse overflow */
|
||||
LZ4_resetStream(LZ4_dict);
|
||||
|
||||
if (dictSize < MINMATCH)
|
||||
if (dictSize < (int)HASH_UNIT)
|
||||
{
|
||||
dict->dictionary = NULL;
|
||||
dict->dictSize = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (p <= dictEnd - 64 KB) p = dictEnd - 64 KB;
|
||||
if ((dictEnd - p) > 64 KB) p = dictEnd - 64 KB;
|
||||
dict->currentOffset += 64 KB;
|
||||
base = p - dict->currentOffset;
|
||||
dict->dictionary = p;
|
||||
dict->dictSize = (U32)(dictEnd - p);
|
||||
dict->currentOffset += dict->dictSize;
|
||||
|
||||
while (p <= dictEnd-MINMATCH)
|
||||
while (p <= dictEnd-HASH_UNIT)
|
||||
{
|
||||
LZ4_putPosition(p, dict, byU32, base);
|
||||
LZ4_putPosition(p, dict->hashTable, byU32, base);
|
||||
p+=3;
|
||||
}
|
||||
|
||||
|
|
@ -830,8 +1008,7 @@ static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src)
|
|||
}
|
||||
|
||||
|
||||
FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* source, char* dest, int inputSize,
|
||||
int maxOutputSize, limitedOutput_directive limit)
|
||||
int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
|
||||
{
|
||||
LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_stream;
|
||||
const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize;
|
||||
|
|
@ -840,6 +1017,7 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
|
|||
if (streamPtr->initCheck) return 0; /* Uninitialized structure detected */
|
||||
if ((streamPtr->dictSize>0) && (smallest>dictEnd)) smallest = dictEnd;
|
||||
LZ4_renormDictT(streamPtr, smallest);
|
||||
if (acceleration < 1) acceleration = ACCELERATION_DEFAULT;
|
||||
|
||||
/* Check overlapping input/dictionary space */
|
||||
{
|
||||
|
|
@ -858,9 +1036,9 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
|
|||
{
|
||||
int result;
|
||||
if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset))
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, dictSmall);
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, dictSmall, acceleration);
|
||||
else
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, noDictIssue);
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, noDictIssue, acceleration);
|
||||
streamPtr->dictSize += (U32)inputSize;
|
||||
streamPtr->currentOffset += (U32)inputSize;
|
||||
return result;
|
||||
|
|
@ -870,9 +1048,9 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
|
|||
{
|
||||
int result;
|
||||
if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset))
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, dictSmall);
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, dictSmall, acceleration);
|
||||
else
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, noDictIssue);
|
||||
result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, noDictIssue, acceleration);
|
||||
streamPtr->dictionary = (const BYTE*)source;
|
||||
streamPtr->dictSize = (U32)inputSize;
|
||||
streamPtr->currentOffset += (U32)inputSize;
|
||||
|
|
@ -880,18 +1058,8 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
|
|||
}
|
||||
}
|
||||
|
||||
int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize)
|
||||
{
|
||||
return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, 0, notLimited);
|
||||
}
|
||||
|
||||
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput);
|
||||
}
|
||||
|
||||
|
||||
/* Hidden debug function, to force separate dictionary mode */
|
||||
/* Hidden debug function, to force external dictionary mode */
|
||||
int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int inputSize)
|
||||
{
|
||||
LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_dict;
|
||||
|
|
@ -902,7 +1070,7 @@ int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char*
|
|||
if (smallest > (const BYTE*) source) smallest = (const BYTE*) source;
|
||||
LZ4_renormDictT((LZ4_stream_t_internal*)LZ4_dict, smallest);
|
||||
|
||||
result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue);
|
||||
result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue, 1);
|
||||
|
||||
streamPtr->dictionary = (const BYTE*)source;
|
||||
streamPtr->dictSize = (U32)inputSize;
|
||||
|
|
@ -955,7 +1123,7 @@ FORCE_INLINE int LZ4_decompress_generic(
|
|||
)
|
||||
{
|
||||
/* Local Variables */
|
||||
const BYTE* restrict ip = (const BYTE*) source;
|
||||
const BYTE* ip = (const BYTE*) source;
|
||||
const BYTE* const iend = ip + inputSize;
|
||||
|
||||
BYTE* op = (BYTE*) dest;
|
||||
|
|
@ -1051,8 +1219,7 @@ FORCE_INLINE int LZ4_decompress_generic(
|
|||
{
|
||||
/* match can be copied as a single segment from external dictionary */
|
||||
match = dictEnd - (lowPrefix-match);
|
||||
memcpy(op, match, length);
|
||||
op += length;
|
||||
memmove(op, match, length); op += length;
|
||||
}
|
||||
else
|
||||
{
|
||||
|
|
@ -1110,11 +1277,11 @@ FORCE_INLINE int LZ4_decompress_generic(
|
|||
if (endOnInput)
|
||||
return (int) (((char*)op)-dest); /* Nb of output bytes decoded */
|
||||
else
|
||||
return (int) (((char*)ip)-source); /* Nb of input bytes read */
|
||||
return (int) (((const char*)ip)-source); /* Nb of input bytes read */
|
||||
|
||||
/* Overflow error detected */
|
||||
_output_error:
|
||||
return (int) (-(((char*)ip)-source))-1;
|
||||
return (int) (-(((const char*)ip)-source))-1;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -1138,9 +1305,9 @@ int LZ4_decompress_fast(const char* source, char* dest, int originalSize)
|
|||
|
||||
typedef struct
|
||||
{
|
||||
BYTE* externalDict;
|
||||
const BYTE* externalDict;
|
||||
size_t extDictSize;
|
||||
BYTE* prefixEnd;
|
||||
const BYTE* prefixEnd;
|
||||
size_t prefixSize;
|
||||
} LZ4_streamDecode_t_internal;
|
||||
|
||||
|
|
@ -1172,7 +1339,7 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
|
|||
{
|
||||
LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode;
|
||||
lz4sd->prefixSize = (size_t) dictSize;
|
||||
lz4sd->prefixEnd = (BYTE*) dictionary + dictSize;
|
||||
lz4sd->prefixEnd = (const BYTE*) dictionary + dictSize;
|
||||
lz4sd->externalDict = NULL;
|
||||
lz4sd->extDictSize = 0;
|
||||
return 1;
|
||||
|
|
@ -1261,7 +1428,7 @@ FORCE_INLINE int LZ4_decompress_usingDict_generic(const char* source, char* dest
|
|||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, withPrefix64k, (BYTE*)dest-64 KB, NULL, 0);
|
||||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest-dictSize, NULL, 0);
|
||||
}
|
||||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, usingExtDict, (BYTE*)dest, (BYTE*)dictStart, dictSize);
|
||||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, usingExtDict, (BYTE*)dest, (const BYTE*)dictStart, dictSize);
|
||||
}
|
||||
|
||||
int LZ4_decompress_safe_usingDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize)
|
||||
|
|
@ -1277,13 +1444,21 @@ int LZ4_decompress_fast_usingDict(const char* source, char* dest, int originalSi
|
|||
/* debug function */
|
||||
int LZ4_decompress_safe_forceExtDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize)
|
||||
{
|
||||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, (BYTE*)dest, (BYTE*)dictStart, dictSize);
|
||||
return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, (BYTE*)dest, (const BYTE*)dictStart, dictSize);
|
||||
}
|
||||
|
||||
|
||||
/***************************************************
|
||||
* Obsolete Functions
|
||||
***************************************************/
|
||||
/* obsolete compression functions */
|
||||
int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize) { return LZ4_compress_default(source, dest, inputSize, maxOutputSize); }
|
||||
int LZ4_compress(const char* source, char* dest, int inputSize) { return LZ4_compress_default(source, dest, inputSize, LZ4_compressBound(inputSize)); }
|
||||
int LZ4_compress_limitedOutput_withState (void* state, const char* src, char* dst, int srcSize, int dstSize) { return LZ4_compress_fast_extState(state, src, dst, srcSize, dstSize, 1); }
|
||||
int LZ4_compress_withState (void* state, const char* src, char* dst, int srcSize) { return LZ4_compress_fast_extState(state, src, dst, srcSize, LZ4_compressBound(srcSize), 1); }
|
||||
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_fast_continue(LZ4_stream, src, dst, srcSize, maxDstSize, 1); }
|
||||
int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize) { return LZ4_compress_fast_continue(LZ4_stream, source, dest, inputSize, LZ4_compressBound(inputSize), 1); }
|
||||
|
||||
/*
|
||||
These function names are deprecated and should no longer be used.
|
||||
They are only provided here for compatibility with older user programs.
|
||||
|
|
@ -1298,23 +1473,23 @@ int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize,
|
|||
|
||||
int LZ4_sizeofStreamState() { return LZ4_STREAMSIZE; }
|
||||
|
||||
static void LZ4_init(LZ4_stream_t_internal* lz4ds, const BYTE* base)
|
||||
static void LZ4_init(LZ4_stream_t_internal* lz4ds, BYTE* base)
|
||||
{
|
||||
MEM_INIT(lz4ds, 0, LZ4_STREAMSIZE);
|
||||
lz4ds->bufferStart = base;
|
||||
}
|
||||
|
||||
int LZ4_resetStreamState(void* state, const char* inputBuffer)
|
||||
int LZ4_resetStreamState(void* state, char* inputBuffer)
|
||||
{
|
||||
if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */
|
||||
LZ4_init((LZ4_stream_t_internal*)state, (const BYTE*)inputBuffer);
|
||||
LZ4_init((LZ4_stream_t_internal*)state, (BYTE*)inputBuffer);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void* LZ4_create (const char* inputBuffer)
|
||||
void* LZ4_create (char* inputBuffer)
|
||||
{
|
||||
void* lz4ds = ALLOCATOR(8, LZ4_STREAMSIZE_U64);
|
||||
LZ4_init ((LZ4_stream_t_internal*)lz4ds, (const BYTE*)inputBuffer);
|
||||
LZ4_init ((LZ4_stream_t_internal*)lz4ds, (BYTE*)inputBuffer);
|
||||
return lz4ds;
|
||||
}
|
||||
|
||||
|
|
@ -1325,32 +1500,6 @@ char* LZ4_slideInputBuffer (void* LZ4_Data)
|
|||
return (char*)(ctx->bufferStart + dictSize);
|
||||
}
|
||||
|
||||
/* Obsolete compresson functions using User-allocated state */
|
||||
|
||||
int LZ4_sizeofState() { return LZ4_STREAMSIZE; }
|
||||
|
||||
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize)
|
||||
{
|
||||
if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
|
||||
MEM_INIT(state, 0, LZ4_STREAMSIZE);
|
||||
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue);
|
||||
else
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue);
|
||||
}
|
||||
|
||||
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
|
||||
MEM_INIT(state, 0, LZ4_STREAMSIZE);
|
||||
|
||||
if (inputSize < LZ4_64Klimit)
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue);
|
||||
else
|
||||
return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue);
|
||||
}
|
||||
|
||||
/* Obsolete streaming decompression functions */
|
||||
|
||||
int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int compressedSize, int maxOutputSize)
|
||||
|
|
|
|||
|
|
@ -39,17 +39,17 @@ extern "C" {
|
|||
#endif
|
||||
|
||||
/*
|
||||
* lz4.h provides block compression functions, for optimal performance.
|
||||
* lz4.h provides block compression functions, and gives full buffer control to programmer.
|
||||
* If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
|
||||
* please use lz4frame.h instead.
|
||||
* and can let the library handle its own memory, please use lz4frame.h instead.
|
||||
*/
|
||||
|
||||
/**************************************
|
||||
* Version
|
||||
**************************************/
|
||||
#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
|
||||
#define LZ4_VERSION_MINOR 6 /* for new (non-breaking) interface capabilities */
|
||||
#define LZ4_VERSION_RELEASE 0 /* for tweaks, bug-fixes, or development */
|
||||
#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
|
||||
#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
|
||||
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
|
||||
int LZ4_versionNumber (void);
|
||||
|
||||
|
|
@ -70,28 +70,32 @@ int LZ4_versionNumber (void);
|
|||
* Simple Functions
|
||||
**************************************/
|
||||
|
||||
int LZ4_compress (const char* source, char* dest, int sourceSize);
|
||||
int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
|
||||
int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
|
||||
|
||||
/*
|
||||
LZ4_compress() :
|
||||
Compresses 'sourceSize' bytes from 'source' into 'dest'.
|
||||
Destination buffer must be already allocated,
|
||||
and must be sized to handle worst cases situations (input data not compressible)
|
||||
Worst case size evaluation is provided by function LZ4_compressBound()
|
||||
inputSize : Max supported value is LZ4_MAX_INPUT_SIZE
|
||||
return : the number of bytes written in buffer dest
|
||||
or 0 if the compression fails
|
||||
LZ4_compress_default() :
|
||||
Compresses 'sourceSize' bytes from buffer 'source'
|
||||
into already allocated 'dest' buffer of size 'maxDestSize'.
|
||||
Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
|
||||
It also runs faster, so it's a recommended setting.
|
||||
If the function cannot compress 'source' into a more limited 'dest' budget,
|
||||
compression stops *immediately*, and the function result is zero.
|
||||
As a consequence, 'dest' content is not valid.
|
||||
This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
|
||||
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
|
||||
maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
|
||||
return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
|
||||
or 0 if compression fails
|
||||
|
||||
LZ4_decompress_safe() :
|
||||
compressedSize : is obviously the source size
|
||||
maxDecompressedSize : is the size of the destination buffer, which must be already allocated.
|
||||
return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize)
|
||||
If the destination buffer is not large enough, decoding will stop and output an error code (<0).
|
||||
compressedSize : is the precise full size of the compressed block.
|
||||
maxDecompressedSize : is the size of destination buffer, which must be already allocated.
|
||||
return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
|
||||
If destination buffer is not large enough, decoding will stop and output an error code (<0).
|
||||
If the source stream is detected malformed, the function will stop decoding and return a negative result.
|
||||
This function is protected against buffer overflow exploits,
|
||||
and never writes outside of output buffer, nor reads outside of input buffer.
|
||||
It is also protected against malicious data packets.
|
||||
This function is protected against buffer overflow exploits, including malicious data packets.
|
||||
It never writes outside output buffer, nor reads outside input buffer.
|
||||
*/
|
||||
|
||||
|
||||
|
|
@ -99,45 +103,54 @@ LZ4_decompress_safe() :
|
|||
* Advanced Functions
|
||||
**************************************/
|
||||
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
|
||||
#define LZ4_COMPRESSBOUND(isize) ((unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
|
||||
#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
|
||||
|
||||
/*
|
||||
LZ4_compressBound() :
|
||||
Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
|
||||
This function is primarily useful for memory allocation purposes (output buffer size).
|
||||
This function is primarily useful for memory allocation purposes (destination buffer size).
|
||||
Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
|
||||
|
||||
isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
|
||||
return : maximum output size in a "worst case" scenario
|
||||
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
|
||||
Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
|
||||
inputSize : max supported value is LZ4_MAX_INPUT_SIZE
|
||||
return : maximum output size in a "worst case" scenario
|
||||
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
|
||||
*/
|
||||
int LZ4_compressBound(int isize);
|
||||
int LZ4_compressBound(int inputSize);
|
||||
|
||||
/*
|
||||
LZ4_compress_fast() :
|
||||
Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
|
||||
The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
|
||||
It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
|
||||
An acceleration value of "1" is the same as regular LZ4_compress_default()
|
||||
Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
|
||||
*/
|
||||
int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
|
||||
|
||||
|
||||
/*
|
||||
LZ4_compress_limitedOutput() :
|
||||
Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
|
||||
If it cannot achieve it, compression will stop, and result of the function will be zero.
|
||||
This saves time and memory on detecting non-compressible (or barely compressible) data.
|
||||
This function never writes outside of provided output buffer.
|
||||
|
||||
sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
|
||||
maxOutputSize : is the size of the destination buffer (which must be already allocated)
|
||||
return : the number of bytes written in buffer 'dest'
|
||||
or 0 if compression fails
|
||||
*/
|
||||
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
|
||||
|
||||
|
||||
/*
|
||||
LZ4_compress_withState() :
|
||||
Same compression functions, but using an externally allocated memory space to store compression state.
|
||||
LZ4_compress_fast_extState() :
|
||||
Same compression function, just using an externally allocated memory space to store compression state.
|
||||
Use LZ4_sizeofState() to know how much memory must be allocated,
|
||||
and then, provide it as 'void* state' to compression functions.
|
||||
and allocate it on 8-bytes boundaries (using malloc() typically).
|
||||
Then, provide it as 'void* state' to compression function.
|
||||
*/
|
||||
int LZ4_sizeofState(void);
|
||||
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
|
||||
|
||||
|
||||
/*
|
||||
LZ4_compress_destSize() :
|
||||
Reverse the logic, by compressing as much data as possible from 'source' buffer
|
||||
into already allocated buffer 'dest' of size 'targetDestSize'.
|
||||
This function either compresses the entire 'source' content into 'dest' if it's large enough,
|
||||
or fill 'dest' buffer completely with as much data as possible from 'source'.
|
||||
*sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
|
||||
New value is necessarily <= old value.
|
||||
return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
|
||||
or 0 if compression fails
|
||||
*/
|
||||
int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
|
||||
|
||||
|
||||
/*
|
||||
|
|
@ -153,7 +166,6 @@ LZ4_decompress_fast() :
|
|||
*/
|
||||
int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
|
||||
|
||||
|
||||
/*
|
||||
LZ4_decompress_safe_partial() :
|
||||
This function decompress a compressed block of size 'compressedSize' at position 'source'
|
||||
|
|
@ -172,7 +184,6 @@ int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedS
|
|||
/***********************************************
|
||||
* Streaming Compression Functions
|
||||
***********************************************/
|
||||
|
||||
#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
|
||||
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
|
||||
/*
|
||||
|
|
@ -188,7 +199,7 @@ typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
|
|||
* LZ4_resetStream
|
||||
* Use this function to init an allocated LZ4_stream_t structure
|
||||
*/
|
||||
void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
|
||||
void LZ4_resetStream (LZ4_stream_t* streamPtr);
|
||||
|
||||
/*
|
||||
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
|
||||
|
|
@ -197,7 +208,7 @@ void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
|
|||
* They are more future proof, in case of a change of LZ4_stream_t size.
|
||||
*/
|
||||
LZ4_stream_t* LZ4_createStream(void);
|
||||
int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr);
|
||||
int LZ4_freeStream (LZ4_stream_t* streamPtr);
|
||||
|
||||
/*
|
||||
* LZ4_loadDict
|
||||
|
|
@ -206,32 +217,27 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_streamPtr);
|
|||
* Loading a size of 0 is allowed.
|
||||
* Return : dictionary size, in bytes (necessarily <= 64 KB)
|
||||
*/
|
||||
int LZ4_loadDict (LZ4_stream_t* LZ4_streamPtr, const char* dictionary, int dictSize);
|
||||
int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
|
||||
|
||||
/*
|
||||
* LZ4_compress_continue
|
||||
* Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio
|
||||
* Previous data blocks are assumed to still be present at their previous location.
|
||||
* dest buffer must be already allocated, and sized to at least LZ4_compressBound(inputSize)
|
||||
* LZ4_compress_fast_continue
|
||||
* Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
|
||||
* Important : Previous data blocks are assumed to still be present and unmodified !
|
||||
* 'dst' buffer must be already allocated.
|
||||
* If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
|
||||
* If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
|
||||
*/
|
||||
int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
|
||||
|
||||
/*
|
||||
* LZ4_compress_limitedOutput_continue
|
||||
* Same as before, but also specify a maximum target compressed size (maxOutputSize)
|
||||
* If objective cannot be met, compression exits, and returns a zero.
|
||||
*/
|
||||
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
|
||||
|
||||
/*
|
||||
* LZ4_saveDict
|
||||
* If previously compressed data block is not guaranteed to remain available at its memory location
|
||||
* save it into a safer place (char* safeBuffer)
|
||||
* Note : you don't need to call LZ4_loadDict() afterwards,
|
||||
* dictionary is immediately usable, you can therefore call again LZ4_compress_continue()
|
||||
* dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue()
|
||||
* Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error
|
||||
*/
|
||||
int LZ4_saveDict (LZ4_stream_t* LZ4_streamPtr, char* safeBuffer, int dictSize);
|
||||
int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
|
||||
|
||||
|
||||
/************************************************
|
||||
|
|
@ -266,8 +272,18 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
|
|||
*_continue() :
|
||||
These decoding functions allow decompression of multiple blocks in "streaming" mode.
|
||||
Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
|
||||
If this condition is not possible, save the relevant part of decoded data into a safe buffer,
|
||||
and indicate where is its new address using LZ4_setStreamDecode()
|
||||
In the case of a ring buffers, decoding buffer must be either :
|
||||
- Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
|
||||
In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
|
||||
- Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
|
||||
maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
|
||||
In which case, encoding and decoding buffers do not need to be synchronized,
|
||||
and encoding ring buffer can have any size, including small ones ( < 64 KB).
|
||||
- _At least_ 64 KB + 8 bytes + maxBlockSize.
|
||||
In which case, encoding and decoding buffers do not need to be synchronized,
|
||||
and encoding ring buffer can have any size, including larger than decoding buffer.
|
||||
Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
|
||||
and indicate where it is saved using LZ4_setStreamDecode()
|
||||
*/
|
||||
int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
|
||||
int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
|
||||
|
|
@ -277,8 +293,8 @@ int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch
|
|||
Advanced decoding functions :
|
||||
*_usingDict() :
|
||||
These decoding functions work the same as
|
||||
a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
|
||||
They are stand-alone and don't use nor update an LZ4_streamDecode_t structure.
|
||||
a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
|
||||
They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
|
||||
*/
|
||||
int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
|
||||
int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
|
||||
|
|
@ -288,27 +304,55 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
|
|||
/**************************************
|
||||
* Obsolete Functions
|
||||
**************************************/
|
||||
/*
|
||||
Obsolete decompression functions
|
||||
These function names are deprecated and should no longer be used.
|
||||
They are only provided here for compatibility with older user programs.
|
||||
- LZ4_uncompress is the same as LZ4_decompress_fast
|
||||
- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
|
||||
These function prototypes are now disabled; uncomment them if you really need them.
|
||||
It is highly recommended to stop using these functions and migrate to newer ones */
|
||||
/* Deprecate Warnings */
|
||||
/* Should these warnings messages be a problem,
|
||||
it is generally possible to disable them,
|
||||
with -Wno-deprecated-declarations for gcc
|
||||
or _CRT_SECURE_NO_WARNINGS in Visual for example.
|
||||
You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
|
||||
#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
|
||||
# define LZ4_DEPRECATE_WARNING_DEFBLOCK
|
||||
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
|
||||
# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
|
||||
# elif (LZ4_GCC_VERSION >= 301)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
|
||||
# elif defined(_MSC_VER)
|
||||
# define LZ4_DEPRECATED(message) __declspec(deprecated(message))
|
||||
# else
|
||||
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
|
||||
# define LZ4_DEPRECATED(message)
|
||||
# endif
|
||||
#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
|
||||
|
||||
/* Obsolete compression functions */
|
||||
/* These functions are planned to start generate warnings by r131 approximately */
|
||||
int LZ4_compress (const char* source, char* dest, int sourceSize);
|
||||
int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
|
||||
int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
/* Obsolete decompression functions */
|
||||
/* These function names are completely deprecated and must no longer be used.
|
||||
They are only provided here for compatibility with older programs.
|
||||
- LZ4_uncompress is the same as LZ4_decompress_fast
|
||||
- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
|
||||
These function prototypes are now disabled; uncomment them only if you really need them.
|
||||
It is highly recommended to stop using these prototypes and migrate to maintained ones */
|
||||
/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
|
||||
/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
|
||||
|
||||
|
||||
/* Obsolete streaming functions; use new streaming interface whenever possible */
|
||||
void* LZ4_create (const char* inputBuffer);
|
||||
int LZ4_sizeofStreamState(void);
|
||||
int LZ4_resetStreamState(void* state, const char* inputBuffer);
|
||||
char* LZ4_slideInputBuffer (void* state);
|
||||
LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
|
||||
LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
|
||||
LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
|
||||
LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
|
||||
|
||||
/* Obsolete streaming decoding functions */
|
||||
int LZ4_decompress_safe_withPrefix64k (const char* source, char* dest, int compressedSize, int maxOutputSize);
|
||||
int LZ4_decompress_fast_withPrefix64k (const char* source, char* dest, int originalSize);
|
||||
LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
|
||||
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
|
||||
|
||||
|
||||
#if defined (__cplusplus)
|
||||
|
|
|
|||
|
|
@ -1,53 +1,53 @@
|
|||
/*
|
||||
LZ4 HC - High Compression Mode of LZ4
|
||||
Copyright (C) 2011-2015, Yann Collet.
|
||||
LZ4 HC - High Compression Mode of LZ4
|
||||
Copyright (C) 2011-2015, Yann Collet.
|
||||
|
||||
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
||||
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:
|
||||
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.
|
||||
* 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.
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
You can contact the author at :
|
||||
- LZ4 source repository : https://github.com/Cyan4973/lz4
|
||||
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
|
||||
You can contact the author at :
|
||||
- LZ4 source repository : https://github.com/Cyan4973/lz4
|
||||
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
|
||||
*/
|
||||
|
||||
|
||||
|
||||
/**************************************
|
||||
Tuning Parameter
|
||||
* Tuning Parameter
|
||||
**************************************/
|
||||
static const int LZ4HC_compressionLevel_default = 9;
|
||||
|
||||
|
||||
/**************************************
|
||||
Includes
|
||||
* Includes
|
||||
**************************************/
|
||||
#include "lz4hc.h"
|
||||
|
||||
|
||||
/**************************************
|
||||
Local Compiler Options
|
||||
* Local Compiler Options
|
||||
**************************************/
|
||||
#if defined(__GNUC__)
|
||||
# pragma GCC diagnostic ignored "-Wunused-function"
|
||||
|
|
@ -59,18 +59,18 @@ static const int LZ4HC_compressionLevel_default = 9;
|
|||
|
||||
|
||||
/**************************************
|
||||
Common LZ4 definition
|
||||
* Common LZ4 definition
|
||||
**************************************/
|
||||
#define LZ4_COMMONDEFS_ONLY
|
||||
#include "lz4.c"
|
||||
|
||||
|
||||
/**************************************
|
||||
Local Constants
|
||||
* Local Constants
|
||||
**************************************/
|
||||
#define DICTIONARY_LOGSIZE 16
|
||||
#define MAXD (1<<DICTIONARY_LOGSIZE)
|
||||
#define MAXD_MASK ((U32)(MAXD - 1))
|
||||
#define MAXD_MASK (MAXD - 1)
|
||||
|
||||
#define HASH_LOG (DICTIONARY_LOGSIZE-1)
|
||||
#define HASHTABLESIZE (1 << HASH_LOG)
|
||||
|
|
@ -82,36 +82,36 @@ static const int g_maxCompressionLevel = 16;
|
|||
|
||||
|
||||
/**************************************
|
||||
Local Types
|
||||
* Local Types
|
||||
**************************************/
|
||||
typedef struct
|
||||
{
|
||||
U32 hashTable[HASHTABLESIZE];
|
||||
U32 hashTable[HASHTABLESIZE];
|
||||
U16 chainTable[MAXD];
|
||||
const BYTE* end; /* next block here to continue on current prefix */
|
||||
const BYTE* base; /* All index relative to this position */
|
||||
const BYTE* dictBase; /* alternate base for extDict */
|
||||
const BYTE* inputBuffer;/* deprecated */
|
||||
BYTE* inputBuffer; /* deprecated */
|
||||
U32 dictLimit; /* below that point, need extDict */
|
||||
U32 lowLimit; /* below that point, no more dict */
|
||||
U32 nextToUpdate;
|
||||
U32 nextToUpdate; /* index from which to continue dictionary update */
|
||||
U32 compressionLevel;
|
||||
} LZ4HC_Data_Structure;
|
||||
|
||||
|
||||
/**************************************
|
||||
Local Macros
|
||||
* Local Macros
|
||||
**************************************/
|
||||
#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
|
||||
#define DELTANEXT(p) chainTable[(size_t)(p) & MAXD_MASK]
|
||||
#define GETNEXT(p) ((p) - (size_t)DELTANEXT(p))
|
||||
//#define DELTANEXTU16(p) chainTable[(p) & MAXD_MASK] /* flexible, MAXD dependent */
|
||||
#define DELTANEXTU16(p) chainTable[(U16)(p)] /* faster */
|
||||
|
||||
static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
|
||||
|
||||
|
||||
|
||||
/**************************************
|
||||
HC Compression
|
||||
* HC Compression
|
||||
**************************************/
|
||||
static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
|
||||
{
|
||||
|
|
@ -119,7 +119,6 @@ static void LZ4HC_init (LZ4HC_Data_Structure* hc4, const BYTE* start)
|
|||
MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
|
||||
hc4->nextToUpdate = 64 KB;
|
||||
hc4->base = start - 64 KB;
|
||||
hc4->inputBuffer = start;
|
||||
hc4->end = start;
|
||||
hc4->dictBase = start - 64 KB;
|
||||
hc4->dictLimit = 64 KB;
|
||||
|
|
@ -141,7 +140,7 @@ FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
|
|||
U32 h = LZ4HC_hashPtr(base+idx);
|
||||
size_t delta = idx - HashTable[h];
|
||||
if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
|
||||
chainTable[idx & 0xFFFF] = (U16)delta;
|
||||
DELTANEXTU16(idx) = (U16)delta;
|
||||
HashTable[h] = idx;
|
||||
idx++;
|
||||
}
|
||||
|
|
@ -197,7 +196,7 @@ FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, /* I
|
|||
if (mlt > ml) { ml = mlt; *matchpos = base + matchIndex; } /* virtual matchpos */
|
||||
}
|
||||
}
|
||||
matchIndex -= chainTable[matchIndex & 0xFFFF];
|
||||
matchIndex -= DELTANEXTU16(matchIndex);
|
||||
}
|
||||
|
||||
return (int)ml;
|
||||
|
|
@ -274,7 +273,7 @@ FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (
|
|||
if ((int)mlt > longest) { longest = (int)mlt; *matchpos = base + matchIndex + back; *startpos = ip+back; }
|
||||
}
|
||||
}
|
||||
matchIndex -= chainTable[matchIndex & 0xFFFF];
|
||||
matchIndex -= DELTANEXTU16(matchIndex);
|
||||
}
|
||||
|
||||
return longest;
|
||||
|
|
@ -536,63 +535,32 @@ _Search3:
|
|||
}
|
||||
|
||||
|
||||
int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel)
|
||||
{
|
||||
LZ4HC_Data_Structure ctx;
|
||||
LZ4HC_init(&ctx, (const BYTE*)source);
|
||||
return LZ4HC_compress_generic (&ctx, source, dest, inputSize, 0, compressionLevel, noLimit);
|
||||
}
|
||||
|
||||
int LZ4_compressHC(const char* source, char* dest, int inputSize) { return LZ4_compressHC2(source, dest, inputSize, 0); }
|
||||
|
||||
int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
|
||||
{
|
||||
LZ4HC_Data_Structure ctx;
|
||||
LZ4HC_init(&ctx, (const BYTE*)source);
|
||||
return LZ4HC_compress_generic (&ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
|
||||
}
|
||||
|
||||
int LZ4_compressHC_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
return LZ4_compressHC2_limitedOutput(source, dest, inputSize, maxOutputSize, 0);
|
||||
}
|
||||
|
||||
|
||||
/*****************************
|
||||
* Using external allocation
|
||||
* ***************************/
|
||||
int LZ4_sizeofStateHC(void) { return sizeof(LZ4HC_Data_Structure); }
|
||||
|
||||
|
||||
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel)
|
||||
int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
|
||||
{
|
||||
if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
|
||||
LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
|
||||
return LZ4HC_compress_generic (state, source, dest, inputSize, 0, compressionLevel, noLimit);
|
||||
LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)src);
|
||||
if (maxDstSize < LZ4_compressBound(srcSize))
|
||||
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, limitedOutput);
|
||||
else
|
||||
return LZ4HC_compress_generic (state, src, dst, srcSize, maxDstSize, compressionLevel, noLimit);
|
||||
}
|
||||
|
||||
int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize)
|
||||
{ return LZ4_compressHC2_withStateHC (state, source, dest, inputSize, 0); }
|
||||
|
||||
|
||||
int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
|
||||
int LZ4_compress_HC(const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel)
|
||||
{
|
||||
if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
|
||||
LZ4HC_init ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
|
||||
return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
|
||||
LZ4HC_Data_Structure state;
|
||||
return LZ4_compress_HC_extStateHC(&state, src, dst, srcSize, maxDstSize, compressionLevel);
|
||||
}
|
||||
|
||||
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{ return LZ4_compressHC2_limitedOutput_withStateHC (state, source, dest, inputSize, maxOutputSize, 0); }
|
||||
|
||||
|
||||
|
||||
/**************************************
|
||||
* Streaming Functions
|
||||
* ************************************/
|
||||
* Streaming Functions
|
||||
**************************************/
|
||||
/* allocation */
|
||||
LZ4_streamHC_t* LZ4_createStreamHC(void) { return (LZ4_streamHC_t*)malloc(sizeof(LZ4_streamHC_t)); }
|
||||
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }
|
||||
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr) { free(LZ4_streamHCPtr); return 0; }
|
||||
|
||||
|
||||
/* initialization */
|
||||
|
|
@ -651,14 +619,15 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
|
|||
}
|
||||
|
||||
/* Check if blocks follow each other */
|
||||
if ((const BYTE*)source != ctxPtr->end) LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
|
||||
if ((const BYTE*)source != ctxPtr->end)
|
||||
LZ4HC_setExternalDict(ctxPtr, (const BYTE*)source);
|
||||
|
||||
/* Check overlapping input/dictionary space */
|
||||
{
|
||||
const BYTE* sourceEnd = (const BYTE*) source + inputSize;
|
||||
const BYTE* dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
|
||||
const BYTE* dictEnd = ctxPtr->dictBase + ctxPtr->dictLimit;
|
||||
if ((sourceEnd > dictBegin) && ((BYTE*)source < dictEnd))
|
||||
if ((sourceEnd > dictBegin) && ((const BYTE*)source < dictEnd))
|
||||
{
|
||||
if (sourceEnd > dictEnd) sourceEnd = dictEnd;
|
||||
ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
|
||||
|
|
@ -669,14 +638,12 @@ static int LZ4_compressHC_continue_generic (LZ4HC_Data_Structure* ctxPtr,
|
|||
return LZ4HC_compress_generic (ctxPtr, source, dest, inputSize, maxOutputSize, ctxPtr->compressionLevel, limit);
|
||||
}
|
||||
|
||||
int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize)
|
||||
int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, 0, noLimit);
|
||||
}
|
||||
|
||||
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
|
||||
if (maxOutputSize < LZ4_compressBound(inputSize))
|
||||
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, limitedOutput);
|
||||
else
|
||||
return LZ4_compressHC_continue_generic ((LZ4HC_Data_Structure*)LZ4_streamHCPtr, source, dest, inputSize, maxOutputSize, noLimit);
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -689,7 +656,7 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
|
|||
if (dictSize > 64 KB) dictSize = 64 KB;
|
||||
if (dictSize < 4) dictSize = 0;
|
||||
if (dictSize > prefixSize) dictSize = prefixSize;
|
||||
memcpy(safeBuffer, streamPtr->end - dictSize, dictSize);
|
||||
memmove(safeBuffer, streamPtr->end - dictSize, dictSize);
|
||||
{
|
||||
U32 endIndex = (U32)(streamPtr->end - streamPtr->base);
|
||||
streamPtr->end = (const BYTE*)safeBuffer + dictSize;
|
||||
|
|
@ -703,21 +670,40 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
|
|||
|
||||
|
||||
/***********************************
|
||||
* Deprecated Functions
|
||||
***********************************/
|
||||
* Deprecated Functions
|
||||
***********************************/
|
||||
/* Deprecated compression functions */
|
||||
/* These functions are planned to start generate warnings by r131 approximately */
|
||||
int LZ4_compressHC(const char* src, char* dst, int srcSize) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
|
||||
int LZ4_compressHC_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, 0); }
|
||||
int LZ4_compressHC2(const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
|
||||
int LZ4_compressHC2_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, cLevel); }
|
||||
int LZ4_compressHC_withStateHC (void* state, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
|
||||
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_extStateHC (state, src, dst, srcSize, maxDstSize, 0); }
|
||||
int LZ4_compressHC2_withStateHC (void* state, const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
|
||||
int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* src, char* dst, int srcSize, int maxDstSize, int cLevel) { return LZ4_compress_HC_extStateHC(state, src, dst, srcSize, maxDstSize, cLevel); }
|
||||
int LZ4_compressHC_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, LZ4_compressBound(srcSize)); }
|
||||
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC_continue (ctx, src, dst, srcSize, maxDstSize); }
|
||||
|
||||
|
||||
/* Deprecated streaming functions */
|
||||
/* These functions currently generate deprecation warnings */
|
||||
int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
|
||||
|
||||
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer)
|
||||
int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
|
||||
{
|
||||
if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1; /* Error : pointer is not aligned for pointer (32 or 64 bits) */
|
||||
LZ4HC_init((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
|
||||
((LZ4HC_Data_Structure*)state)->inputBuffer = (BYTE*)inputBuffer;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void* LZ4_createHC (const char* inputBuffer)
|
||||
void* LZ4_createHC (char* inputBuffer)
|
||||
{
|
||||
void* hc4 = ALLOCATOR(1, sizeof(LZ4HC_Data_Structure));
|
||||
if (hc4 == NULL) return NULL; /* not enough memory */
|
||||
LZ4HC_init ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
|
||||
((LZ4HC_Data_Structure*)hc4)->inputBuffer = (BYTE*)inputBuffer;
|
||||
return hc4;
|
||||
}
|
||||
|
||||
|
|
@ -727,17 +713,6 @@ int LZ4_freeHC (void* LZ4HC_Data)
|
|||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize)
|
||||
{
|
||||
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, 0, noLimit);
|
||||
}
|
||||
int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize)
|
||||
{
|
||||
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, 0, limitedOutput);
|
||||
}
|
||||
*/
|
||||
|
||||
int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel)
|
||||
{
|
||||
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, compressionLevel, noLimit);
|
||||
|
|
|
|||
|
|
@ -38,70 +38,6 @@
|
|||
extern "C" {
|
||||
#endif
|
||||
|
||||
|
||||
int LZ4_compressHC (const char* source, char* dest, int inputSize);
|
||||
/*
|
||||
LZ4_compressHC :
|
||||
return : the number of bytes in compressed buffer dest
|
||||
or 0 if compression fails.
|
||||
note : destination buffer must be already allocated.
|
||||
To avoid any problem, size it to handle worst cases situations (input data not compressible)
|
||||
Worst case size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
|
||||
*/
|
||||
|
||||
int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
/*
|
||||
LZ4_compress_limitedOutput() :
|
||||
Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
|
||||
If it cannot achieve it, compression will stop, and result of the function will be zero.
|
||||
This function never writes outside of provided output buffer.
|
||||
|
||||
inputSize : Max supported value is 1 GB
|
||||
maxOutputSize : is maximum allowed size into the destination buffer (which must be already allocated)
|
||||
return : the number of output bytes written in buffer 'dest'
|
||||
or 0 if compression fails.
|
||||
*/
|
||||
|
||||
|
||||
int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
/*
|
||||
Same functions as above, but with programmable 'compressionLevel'.
|
||||
Recommended values are between 4 and 9, although any value between 0 and 16 will work.
|
||||
'compressionLevel'==0 means use default 'compressionLevel' value.
|
||||
Values above 16 behave the same as 16.
|
||||
Equivalent variants exist for all other compression functions below.
|
||||
*/
|
||||
|
||||
/* Note :
|
||||
Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
|
||||
*/
|
||||
|
||||
|
||||
/**************************************
|
||||
* Using an external allocation
|
||||
**************************************/
|
||||
int LZ4_sizeofStateHC(void);
|
||||
int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
|
||||
/*
|
||||
These functions are provided should you prefer to allocate memory for compression tables with your own allocation methods.
|
||||
To know how much memory must be allocated for the compression tables, use :
|
||||
int LZ4_sizeofStateHC();
|
||||
|
||||
Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0).
|
||||
|
||||
The allocated memory can be provided to the compression functions using 'void* state' parameter.
|
||||
LZ4_compress_withStateHC() and LZ4_compress_limitedOutput_withStateHC() are equivalent to previously described functions.
|
||||
They just use the externally allocated memory for state instead of allocating their own (on stack, or on heap).
|
||||
*/
|
||||
|
||||
|
||||
|
||||
/*****************************
|
||||
* Includes
|
||||
*****************************/
|
||||
|
|
@ -109,70 +45,143 @@ They just use the externally allocated memory for state instead of allocating th
|
|||
|
||||
|
||||
/**************************************
|
||||
* Experimental Streaming Functions
|
||||
* Block Compression
|
||||
**************************************/
|
||||
int LZ4_compress_HC (const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
|
||||
/*
|
||||
LZ4_compress_HC :
|
||||
Destination buffer 'dst' must be already allocated.
|
||||
Compression completion is guaranteed if 'dst' buffer is sized to handle worst circumstances (data not compressible)
|
||||
Worst size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
|
||||
srcSize : Max supported value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
|
||||
compressionLevel : Recommended values are between 4 and 9, although any value between 0 and 16 will work.
|
||||
0 means "use default value" (see lz4hc.c).
|
||||
Values >16 behave the same as 16.
|
||||
return : the number of bytes written into buffer 'dst'
|
||||
or 0 if compression fails.
|
||||
*/
|
||||
|
||||
|
||||
/* Note :
|
||||
Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
|
||||
*/
|
||||
|
||||
|
||||
int LZ4_sizeofStateHC(void);
|
||||
int LZ4_compress_HC_extStateHC(void* state, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
|
||||
/*
|
||||
LZ4_compress_HC_extStateHC() :
|
||||
Use this function if you prefer to manually allocate memory for compression tables.
|
||||
To know how much memory must be allocated for the compression tables, use :
|
||||
int LZ4_sizeofStateHC();
|
||||
|
||||
Allocated memory must be aligned on 8-bytes boundaries (which a normal malloc() will do properly).
|
||||
|
||||
The allocated memory can then be provided to the compression functions using 'void* state' parameter.
|
||||
LZ4_compress_HC_extStateHC() is equivalent to previously described function.
|
||||
It just uses externally allocated memory for stateHC.
|
||||
*/
|
||||
|
||||
|
||||
/**************************************
|
||||
* Streaming Compression
|
||||
**************************************/
|
||||
#define LZ4_STREAMHCSIZE 262192
|
||||
#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
|
||||
typedef struct { size_t table[LZ4_STREAMHCSIZE_SIZET]; } LZ4_streamHC_t;
|
||||
/*
|
||||
LZ4_streamHC_t
|
||||
This structure allows static allocation of LZ4 HC streaming state.
|
||||
State must then be initialized using LZ4_resetStreamHC() before first use.
|
||||
LZ4_streamHC_t
|
||||
This structure allows static allocation of LZ4 HC streaming state.
|
||||
State must then be initialized using LZ4_resetStreamHC() before first use.
|
||||
|
||||
Static allocation should only be used with statically linked library.
|
||||
If you want to use LZ4 as a DLL, please use construction functions below, which are more future-proof.
|
||||
Static allocation should only be used in combination with static linking.
|
||||
If you want to use LZ4 as a DLL, please use construction functions below, which are future-proof.
|
||||
*/
|
||||
|
||||
|
||||
LZ4_streamHC_t* LZ4_createStreamHC(void);
|
||||
int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr);
|
||||
int LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
|
||||
/*
|
||||
These functions create and release memory for LZ4 HC streaming state.
|
||||
Newly created states are already initialized.
|
||||
Existing state space can be re-used anytime using LZ4_resetStreamHC().
|
||||
If you use LZ4 as a DLL, please use these functions instead of direct struct allocation,
|
||||
to avoid size mismatch between different versions.
|
||||
These functions create and release memory for LZ4 HC streaming state.
|
||||
Newly created states are already initialized.
|
||||
Existing state space can be re-used anytime using LZ4_resetStreamHC().
|
||||
If you use LZ4 as a DLL, use these functions instead of static structure allocation,
|
||||
to avoid size mismatch between different versions.
|
||||
*/
|
||||
|
||||
void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
|
||||
int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, const char* dictionary, int dictSize);
|
||||
void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
|
||||
int LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
|
||||
|
||||
int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr, const char* src, char* dst, int srcSize, int maxDstSize);
|
||||
|
||||
int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int maxDictSize);
|
||||
int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
|
||||
|
||||
/*
|
||||
These functions compress data in successive blocks of any size, using previous blocks as dictionary.
|
||||
One key assumption is that each previous block will remain read-accessible while compressing next block.
|
||||
These functions compress data in successive blocks of any size, using previous blocks as dictionary.
|
||||
One key assumption is that previous blocks (up to 64 KB) remain read-accessible while compressing next blocks.
|
||||
There is an exception for ring buffers, which can be smaller 64 KB.
|
||||
Such case is automatically detected and correctly handled by LZ4_compress_HC_continue().
|
||||
|
||||
Before starting compression, state must be properly initialized, using LZ4_resetStreamHC().
|
||||
A first "fictional block" can then be designated as initial dictionary, using LZ4_loadDictHC() (Optional).
|
||||
Before starting compression, state must be properly initialized, using LZ4_resetStreamHC().
|
||||
A first "fictional block" can then be designated as initial dictionary, using LZ4_loadDictHC() (Optional).
|
||||
|
||||
Then, use LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue() to compress each successive block.
|
||||
They work like usual LZ4_compressHC() or LZ4_compressHC_limitedOutput(), but use previous memory blocks to improve compression.
|
||||
Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
|
||||
Then, use LZ4_compress_HC_continue() to compress each successive block.
|
||||
It works like LZ4_compress_HC(), but use previous memory blocks as dictionary to improve compression.
|
||||
Previous memory blocks (including initial dictionary when present) must remain accessible and unmodified during compression.
|
||||
As a reminder, size 'dst' buffer to handle worst cases, using LZ4_compressBound(), to ensure success of compression operation.
|
||||
|
||||
If, for any reason, previous data block can't be preserved in memory during next compression block,
|
||||
you must save it to a safer memory space,
|
||||
using LZ4_saveDictHC().
|
||||
If, for any reason, previous data blocks can't be preserved unmodified in memory during next compression block,
|
||||
you must save it to a safer memory space, using LZ4_saveDictHC().
|
||||
Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer'.
|
||||
*/
|
||||
|
||||
|
||||
|
||||
/**************************************
|
||||
* Deprecated Streaming Functions
|
||||
* ************************************/
|
||||
/* Note : these streaming functions follows the older model, and should no longer be used */
|
||||
void* LZ4_createHC (const char* inputBuffer);
|
||||
char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
|
||||
int LZ4_freeHC (void* LZ4HC_Data);
|
||||
* Deprecated Functions
|
||||
**************************************/
|
||||
/* Deprecate Warnings */
|
||||
/* Should these warnings messages be a problem,
|
||||
it is generally possible to disable them,
|
||||
with -Wno-deprecated-declarations for gcc
|
||||
or _CRT_SECURE_NO_WARNINGS in Visual for example.
|
||||
You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
|
||||
#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
|
||||
# define LZ4_DEPRECATE_WARNING_DEFBLOCK
|
||||
# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
|
||||
# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
|
||||
# elif (LZ4_GCC_VERSION >= 301)
|
||||
# define LZ4_DEPRECATED(message) __attribute__((deprecated))
|
||||
# elif defined(_MSC_VER)
|
||||
# define LZ4_DEPRECATED(message) __declspec(deprecated(message))
|
||||
# else
|
||||
# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
|
||||
# define LZ4_DEPRECATED(message)
|
||||
# endif
|
||||
#endif // LZ4_DEPRECATE_WARNING_DEFBLOCK
|
||||
|
||||
int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
/* compression functions */
|
||||
/* these functions are planned to trigger warning messages by r131 approximately */
|
||||
int LZ4_compressHC (const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
int LZ4_compressHC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
|
||||
int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
|
||||
|
||||
int LZ4_sizeofStreamStateHC(void);
|
||||
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
|
||||
/* Streaming functions following the older model; should no longer be used */
|
||||
LZ4_DEPRECATED("use LZ4_createStreamHC() instead") void* LZ4_createHC (char* inputBuffer);
|
||||
LZ4_DEPRECATED("use LZ4_saveDictHC() instead") char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
|
||||
LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") int LZ4_freeHC (void* LZ4HC_Data);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
|
||||
LZ4_DEPRECATED("use LZ4_createStreamHC() instead") int LZ4_sizeofStreamStateHC(void);
|
||||
LZ4_DEPRECATED("use LZ4_resetStreamHC() instead") int LZ4_resetStreamStateHC(void* state, char* inputBuffer);
|
||||
|
||||
|
||||
#if defined (__cplusplus)
|
||||
|
|
|
|||
Loading…
Reference in New Issue