lz4.h

Go to the documentation of this file.

/*
 *  LZ4 - Fast LZ compression algorithm
 *  Header File
 *  Copyright (C) 2011-2020, Yann Collet.
 
   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
 
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:
 
       * Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
       * Redistributions in binary form must reproduce the above
   copyright notice, this list of conditions and the following disclaimer
   in the documentation and/or other materials provided with the
   distribution.
 
   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
   You can contact the author at :
    - LZ4 homepage : http://www.lz4.org
    - LZ4 source repository : https://github.com/lz4/lz4
*/
#if defined (__cplusplus)
extern "C" {
#endif
 
#ifndef LZ4_H_2983827168210
#define LZ4_H_2983827168210
 
/* --- Dependency --- */
#include <stddef.h>   /* size_t */
 
 
/*^***************************************************************
*  Export parameters
*****************************************************************/
/*
*  LZ4_DLL_EXPORT :
*  Enable exporting of functions when building a Windows DLL
*  LZ4LIB_VISIBILITY :
*  Control library symbols visibility.
*/
#ifndef LZ4LIB_VISIBILITY
#  if defined(__GNUC__) && (__GNUC__ >= 4)
#    define LZ4LIB_VISIBILITY __attribute__ ((visibility ("default")))
#  else
#    define LZ4LIB_VISIBILITY
#  endif
#endif
#if defined(LZ4_DLL_EXPORT) && (LZ4_DLL_EXPORT==1)
#  define LZ4LIB_API __declspec(dllexport) LZ4LIB_VISIBILITY
#elif defined(LZ4_DLL_IMPORT) && (LZ4_DLL_IMPORT==1)
#  define LZ4LIB_API __declspec(dllimport) LZ4LIB_VISIBILITY /* It isn't required but allows to generate better code, saving a function pointer load from the IAT and an indirect jump.*/
#else
#  define LZ4LIB_API LZ4LIB_VISIBILITY
#endif
 
#if defined(LZ4_FREESTANDING) && (LZ4_FREESTANDING == 1)
#  define LZ4_HEAPMODE 0
#  define LZ4HC_HEAPMODE 0
#  define LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION 1
#  if !defined(LZ4_memcpy)
#    error "LZ4_FREESTANDING requires macro 'LZ4_memcpy'."
#  endif
#  if !defined(LZ4_memset)
#    error "LZ4_FREESTANDING requires macro 'LZ4_memset'."
#  endif
#  if !defined(LZ4_memmove)
#    error "LZ4_FREESTANDING requires macro 'LZ4_memmove'."
#  endif
#elif ! defined(LZ4_FREESTANDING)
#  define LZ4_FREESTANDING 0
#endif
 
 
/*------   Version   ------*/
#define LZ4_VERSION_MAJOR    1    /* for breaking interface changes  */
#define LZ4_VERSION_MINOR    9    /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE  4    /* for tweaks, bug-fixes, or development */
 
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
 
#define LZ4_LIB_VERSION LZ4_VERSION_MAJOR.LZ4_VERSION_MINOR.LZ4_VERSION_RELEASE
#define LZ4_QUOTE(str) #str
#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)  /* requires v1.7.3+ */
 
LZ4LIB_API int LZ4_versionNumber (void);  
LZ4LIB_API const char* LZ4_versionString (void);   
/*-************************************
*  Tuning parameter
**************************************/
#define LZ4_MEMORY_USAGE_MIN 10
#define LZ4_MEMORY_USAGE_DEFAULT 14
#define LZ4_MEMORY_USAGE_MAX 20
 
#ifndef LZ4_MEMORY_USAGE
# define LZ4_MEMORY_USAGE LZ4_MEMORY_USAGE_DEFAULT
#endif
 
#if (LZ4_MEMORY_USAGE < LZ4_MEMORY_USAGE_MIN)
#  error "LZ4_MEMORY_USAGE is too small !"
#endif
 
#if (LZ4_MEMORY_USAGE > LZ4_MEMORY_USAGE_MAX)
#  error "LZ4_MEMORY_USAGE is too large !"
#endif
 
/*-************************************
*  Simple Functions
**************************************/
LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
 
LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
 
 
/*-************************************
*  Advanced Functions
**************************************/
#define LZ4_MAX_INPUT_SIZE        0x7E000000   /* 2 113 929 216 bytes */
#define LZ4_COMPRESSBOUND(isize)  ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
 
LZ4LIB_API int LZ4_compressBound(int inputSize);
 
LZ4LIB_API int LZ4_compress_fast (const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 
 
LZ4LIB_API int LZ4_sizeofState(void);
LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 
 
LZ4LIB_API int LZ4_compress_destSize (const char* src, char* dst, int* srcSizePtr, int targetDstSize);
 
 
LZ4LIB_API int LZ4_decompress_safe_partial (const char* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);
 
 
/*-*********************************************
*  Streaming Compression Functions
***********************************************/
typedef union LZ4_stream_u LZ4_stream_t;  /* incomplete type (defined later) */
 
#if !defined(RC_INVOKED) /* https://docs.microsoft.com/en-us/windows/win32/menurc/predefined-macros */
#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
LZ4LIB_API int           LZ4_freeStream (LZ4_stream_t* streamPtr);
#endif /* !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION) */
#endif
 
LZ4LIB_API void LZ4_resetStream_fast (LZ4_stream_t* streamPtr);
 
LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
 
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
 
 
/*-**********************************************
*  Streaming Decompression Functions
*  Bufferless synchronous API
************************************************/
typedef union LZ4_streamDecode_u LZ4_streamDecode_t;   /* tracking context */
 
#if !defined(RC_INVOKED) /* https://docs.microsoft.com/en-us/windows/win32/menurc/predefined-macros */
#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
LZ4LIB_API int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
#endif /* !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION) */
#endif
 
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
 
LZ4LIB_API int LZ4_decoderRingBufferSize(int maxBlockSize);
#define LZ4_DECODER_RING_BUFFER_SIZE(maxBlockSize) (65536 + 14 + (maxBlockSize))  /* for static allocation; maxBlockSize presumed valid */
 
LZ4LIB_API int
LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode,
                        const char* src, char* dst,
                        int srcSize, int dstCapacity);
 
 
LZ4LIB_API int
LZ4_decompress_safe_usingDict(const char* src, char* dst,
                              int srcSize, int dstCapacity,
                              const char* dictStart, int dictSize);
 
LZ4LIB_API int
LZ4_decompress_safe_partial_usingDict(const char* src, char* dst,
                                      int compressedSize,
                                      int targetOutputSize, int maxOutputSize,
                                      const char* dictStart, int dictSize);
 
#endif /* LZ4_H_2983827168210 */
 
 
/*^*************************************
 * !!!!!!   STATIC LINKING ONLY   !!!!!!
 ***************************************/
 
/*-****************************************************************************
 * Experimental section
 *
 * Symbols declared in this section must be considered unstable. Their
 * signatures or semantics may change, or they may be removed altogether in the
 * future. They are therefore only safe to depend on when the caller is
 * statically linked against the library.
 *
 * To protect against unsafe usage, not only are the declarations guarded,
 * the definitions are hidden by default
 * when building LZ4 as a shared/dynamic library.
 *
 * In order to access these declarations,
 * define LZ4_STATIC_LINKING_ONLY in your application
 * before including LZ4's headers.
 *
 * In order to make their implementations accessible dynamically, you must
 * define LZ4_PUBLISH_STATIC_FUNCTIONS when building the LZ4 library.
 ******************************************************************************/
 
#ifdef LZ4_STATIC_LINKING_ONLY
 
#ifndef LZ4_STATIC_3504398509
#define LZ4_STATIC_3504398509
 
#ifdef LZ4_PUBLISH_STATIC_FUNCTIONS
#define LZ4LIB_STATIC_API LZ4LIB_API
#else
#define LZ4LIB_STATIC_API
#endif
 
 
LZ4LIB_STATIC_API int LZ4_compress_fast_extState_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 
LZ4LIB_STATIC_API void
LZ4_attach_dictionary(LZ4_stream_t* workingStream,
                const LZ4_stream_t* dictionaryStream);
 
 
#define LZ4_DECOMPRESS_INPLACE_MARGIN(compressedSize)          (((compressedSize) >> 8) + 32)
#define LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize)   ((decompressedSize) + LZ4_DECOMPRESS_INPLACE_MARGIN(decompressedSize))  
#ifndef LZ4_DISTANCE_MAX   /* history window size; can be user-defined at compile time */
#  define LZ4_DISTANCE_MAX 65535   /* set to maximum value by default */
#endif
 
#define LZ4_COMPRESS_INPLACE_MARGIN                           (LZ4_DISTANCE_MAX + 32)   /* LZ4_DISTANCE_MAX can be safely replaced by srcSize when it's smaller */
#define LZ4_COMPRESS_INPLACE_BUFFER_SIZE(maxCompressedSize)   ((maxCompressedSize) + LZ4_COMPRESS_INPLACE_MARGIN)  
#endif   /* LZ4_STATIC_3504398509 */
#endif   /* LZ4_STATIC_LINKING_ONLY */
 
 
 
#ifndef LZ4_H_98237428734687
#define LZ4_H_98237428734687
 
/*-************************************************************
 *  Private Definitions
 **************************************************************
 * Do not use these definitions directly.
 * They are only exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
 * Accessing members will expose user code to API and/or ABI break in future versions of the library.
 **************************************************************/
#define LZ4_HASHLOG   (LZ4_MEMORY_USAGE-2)
#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG)       /* required as macro for static allocation */
 
#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
# include <stdint.h>
  typedef  int8_t  LZ4_i8;
  typedef uint8_t  LZ4_byte;
  typedef uint16_t LZ4_u16;
  typedef uint32_t LZ4_u32;
#else
  typedef   signed char  LZ4_i8;
  typedef unsigned char  LZ4_byte;
  typedef unsigned short LZ4_u16;
  typedef unsigned int   LZ4_u32;
#endif
 
typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
struct LZ4_stream_t_internal {
    LZ4_u32 hashTable[LZ4_HASH_SIZE_U32];
    const LZ4_byte* dictionary;
    const LZ4_stream_t_internal* dictCtx;
    LZ4_u32 currentOffset;
    LZ4_u32 tableType;
    LZ4_u32 dictSize;
    /* Implicit padding to ensure structure is aligned */
};
 
#define LZ4_STREAM_MINSIZE  ((1UL << LZ4_MEMORY_USAGE) + 32)  /* static size, for inter-version compatibility */
union LZ4_stream_u {
    char minStateSize[LZ4_STREAM_MINSIZE];
    LZ4_stream_t_internal internal_donotuse;
}; /* previously typedef'd to LZ4_stream_t */
 
 
LZ4LIB_API LZ4_stream_t* LZ4_initStream (void* buffer, size_t size);
 
 
typedef struct {
    const LZ4_byte* externalDict;
    const LZ4_byte* prefixEnd;
    size_t extDictSize;
    size_t prefixSize;
} LZ4_streamDecode_t_internal;
 
#define LZ4_STREAMDECODE_MINSIZE 32
union LZ4_streamDecode_u {
    char minStateSize[LZ4_STREAMDECODE_MINSIZE];
    LZ4_streamDecode_t_internal internal_donotuse;
} ;   /* previously typedef'd to LZ4_streamDecode_t */
 
 
 
/*-************************************
*  Obsolete Functions
**************************************/
 
#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
#  define LZ4_DEPRECATED(message)   /* disable deprecation warnings */
#else
#  if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
#    define LZ4_DEPRECATED(message) [[deprecated(message)]]
#  elif defined(_MSC_VER)
#    define LZ4_DEPRECATED(message) __declspec(deprecated(message))
#  elif defined(__clang__) || (defined(__GNUC__) && (__GNUC__ * 10 + __GNUC_MINOR__ >= 45))
#    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
#  elif defined(__GNUC__) && (__GNUC__ * 10 + __GNUC_MINOR__ >= 31)
#    define LZ4_DEPRECATED(message) __attribute__((deprecated))
#  else
#    pragma message("WARNING: LZ4_DEPRECATED needs custom implementation for this compiler")
#    define LZ4_DEPRECATED(message)   /* disabled */
#  endif
#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */
 
LZ4_DEPRECATED("use LZ4_compress_default() instead")       LZ4LIB_API int LZ4_compress               (const char* src, char* dest, int srcSize);
LZ4_DEPRECATED("use LZ4_compress_default() instead")       LZ4LIB_API int LZ4_compress_limitedOutput (const char* src, char* dest, int srcSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_limitedOutput_continue  (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
 
LZ4_DEPRECATED("use LZ4_decompress_fast() instead") LZ4LIB_API int LZ4_uncompress (const char* source, char* dest, int outputSize);
LZ4_DEPRECATED("use LZ4_decompress_safe() instead") LZ4LIB_API int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
 
/* Obsolete streaming functions (since v1.7.0)
 * degraded functionality; do not use!
 *
 * In order to perform streaming compression, these functions depended on data
 * that is no longer tracked in the state. They have been preserved as well as
 * possible: using them will still produce a correct output. However, they don't
 * actually retain any history between compression calls. The compression ratio
 * achieved will therefore be no better than compressing each chunk
 * independently.
 */
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API void* LZ4_create (char* inputBuffer);
LZ4_DEPRECATED("Use LZ4_createStream() instead") LZ4LIB_API int   LZ4_sizeofStreamState(void);
LZ4_DEPRECATED("Use LZ4_resetStream() instead")  LZ4LIB_API int   LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4_DEPRECATED("Use LZ4_saveDict() instead")     LZ4LIB_API char* LZ4_slideInputBuffer (void* state);
 
LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") LZ4LIB_API int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") LZ4LIB_API int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
 
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe() instead")
LZ4LIB_API int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_continue() instead")
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_usingDict() instead")
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
 
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);
 
 
#endif /* LZ4_H_98237428734687 */
 
 
#if defined (__cplusplus)
}
#endif