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src/lz4.h  view on Meta::CPAN

       Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
             Always control how many bytes were decoded.
             If the source stream is detected malformed, the function will stop decoding and return a negative result.
             This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
*/
LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize);


/*-*********************************************
*  Streaming Compression Functions
***********************************************/
typedef union LZ4_stream_u LZ4_stream_t;   /* incomplete type (defined later) */

/*! LZ4_createStream() and LZ4_freeStream() :
 *  LZ4_createStream() will allocate and initialize an `LZ4_stream_t` structure.
 *  LZ4_freeStream() releases its memory.
 */
LZ4LIB_API LZ4_stream_t* LZ4_createStream(void);
LZ4LIB_API int           LZ4_freeStream (LZ4_stream_t* streamPtr);

/*! LZ4_resetStream() :
 *  An LZ4_stream_t structure can be allocated once and re-used multiple times.
 *  Use this function to init an allocated `LZ4_stream_t` structure and start a new compression.
 */
LZ4LIB_API void LZ4_resetStream (LZ4_stream_t* streamPtr);

/*! LZ4_loadDict() :
 *  Use this function to load a static dictionary into LZ4_stream.
 *  Any previous data will be forgotten, only 'dictionary' will remain in memory.
 *  Loading a size of 0 is allowed.
 *  Return : dictionary size, in bytes (necessarily <= 64 KB)
 */
LZ4LIB_API int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);

/*! LZ4_compress_fast_continue() :
 *  Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
 *  Important : Previous data blocks are assumed to 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.
 */
LZ4LIB_API int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);

/*! LZ4_saveDict() :
 *  If previously compressed data block is not guaranteed to remain available at its memory location,
 *  save it into a safer place (char* safeBuffer).
 *  Note : you don't need to call LZ4_loadDict() afterwards,
 *         dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue().
 *  Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error.
 */
LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);


/*-**********************************************
*  Streaming Decompression Functions
*  Bufferless synchronous API
************************************************/
typedef union LZ4_streamDecode_u LZ4_streamDecode_t;   /* incomplete type (defined later) */

/*! LZ4_createStreamDecode() and LZ4_freeStreamDecode() :
 *  creation / destruction of streaming decompression tracking structure */
LZ4LIB_API LZ4_streamDecode_t* LZ4_createStreamDecode(void);
LZ4LIB_API int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);

/*! LZ4_setStreamDecode() :
 *  Use this function to instruct where to find the dictionary.
 *  Setting a size of 0 is allowed (same effect as reset).
 *  @return : 1 if OK, 0 if error
 */
LZ4LIB_API int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);

/*!
LZ4_decompress_*_continue() :
    These decoding functions allow decompression of multiple blocks in "streaming" mode.
    Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
    In the case of a ring buffers, decoding buffer must be either :
    - Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
      In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
    - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
      maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
      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()
*/
LZ4LIB_API int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
LZ4LIB_API int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);


/*! LZ4_decompress_*_usingDict() :
 *  These decoding functions work the same as
 *  a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
 *  They are stand-alone, and don't need an LZ4_streamDecode_t structure.
 */
LZ4LIB_API int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
LZ4LIB_API int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);


/*^**********************************************
 * !!!!!!   STATIC LINKING ONLY   !!!!!!
 ***********************************************/
/*-************************************
 *  Private definitions
 **************************************
 * Do not use these definitions.
 * They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
 * Using these definitions will expose code to API and/or ABI break in future versions of the library.
 **************************************/
#define LZ4_HASHLOG   (LZ4_MEMORY_USAGE-2)
#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG)       /* required as macro for static allocation */

#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#include <stdint.h>

typedef struct {
    uint32_t hashTable[LZ4_HASH_SIZE_U32];
    uint32_t currentOffset;
    uint32_t initCheck;
    const uint8_t* dictionary;
    uint8_t* bufferStart;   /* obsolete, used for slideInputBuffer */
    uint32_t dictSize;
} LZ4_stream_t_internal;

typedef struct {
    const uint8_t* externalDict;
    size_t extDictSize;
    const uint8_t* prefixEnd;
    size_t prefixSize;
} LZ4_streamDecode_t_internal;

src/lz4.h  view on Meta::CPAN

    LZ4_stream_t_internal internal_donotuse;
} ;  /* previously typedef'd to LZ4_stream_t */


/*!
 * LZ4_streamDecode_t :
 * information structure to track an LZ4 stream during decompression.
 * init this structure  using LZ4_setStreamDecode (or memset()) before first use
 * note : only use in association with static linking !
 *        this definition is not API/ABI safe,
 *        and may change in a future version !
 */
#define LZ4_STREAMDECODESIZE_U64  4
#define LZ4_STREAMDECODESIZE     (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
union LZ4_streamDecode_u {
    unsigned long long table[LZ4_STREAMDECODESIZE_U64];
    LZ4_streamDecode_t_internal internal_donotuse;
} ;   /* previously typedef'd to LZ4_streamDecode_t */


/*-************************************
*  Obsolete Functions
**************************************/

/*! Deprecation warnings
   Should deprecation warnings be a problem,
   it is generally possible to disable them,
   typically with -Wno-deprecated-declarations for gcc
   or _CRT_SECURE_NO_WARNINGS in Visual.
   Otherwise, it's also possible to define LZ4_DISABLE_DEPRECATE_WARNINGS */
#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
#  define LZ4_DEPRECATED(message)   /* disable deprecation warnings */
#else
#  define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
#  if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
#    define LZ4_DEPRECATED(message) [[deprecated(message)]]
#  elif (LZ4_GCC_VERSION >= 405) || defined(__clang__)
#    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
#  elif (LZ4_GCC_VERSION >= 301)
#    define LZ4_DEPRECATED(message) __attribute__((deprecated))
#  elif defined(_MSC_VER)
#    define LZ4_DEPRECATED(message) __declspec(deprecated(message))
#  else
#    pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
#    define LZ4_DEPRECATED(message)
#  endif
#endif /* LZ4_DISABLE_DEPRECATE_WARNINGS */

/* Obsolete compression functions */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress               (const char* source, char* dest, int sourceSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_default() instead") int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") int LZ4_compress_limitedOutput_continue  (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);

/* Obsolete decompression functions */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast() instead") int LZ4_uncompress (const char* source, char* dest, int outputSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe() instead") int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);

/* Obsolete streaming functions; use new streaming interface whenever possible */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_createStream() instead") int   LZ4_sizeofStreamState(void);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_resetStream() instead")  int   LZ4_resetStreamState(void* state, char* inputBuffer);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_saveDict() instead")     char* LZ4_slideInputBuffer (void* state);

/* Obsolete streaming decoding functions */
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
LZ4LIB_API LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);

#endif /* LZ4_H_2983827168210 */

#if defined (__cplusplus)
}
#endif