kimcinoo
/
efl
forked from enlightenment/efl
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

lz4: fix possible security issue. 

See :
- http://fastcompression.blogspot.fr/2014/06/lets-move-on.html
- http://www.openwall.com/lists/oss-security/2014/06/26/25

@fix
This commit is contained in:
Cedric BAIL 2014-06-29 12:56:56 +02:00
parent 201d9b567d
commit 2c97212736
4 changed files with 2615 additions and 1720 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1547
src/static_libs/lz4/lz4.c
View File

File diff suppressed because it is too large Load Diff

272
src/static_libs/lz4/lz4.h
View File

@ -1,7 +1,7 @@
/*
LZ4 - Fast LZ compression algorithm
Header File
Copyright (C) 2011-2012, Yann Collet.
Copyright (C) 2011-2014, 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
@ -28,8 +28,8 @@
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
You can contact the author at :
- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
- LZ4 source repository : http://code.google.com/p/lz4/
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
#pragma once
@ -38,89 +38,267 @@ extern "C" {
#endif
//**************************************
// Compiler Options
//**************************************
#ifdef _MSC_VER // Visual Studio
# define inline __inline // Visual is not C99, but supports some kind of inline
#endif
/**************************************
Version
**************************************/
#define LZ4_VERSION_MAJOR 1 /* for major interface/format changes */
#define LZ4_VERSION_MINOR 2 /* for minor interface/format changes */
#define LZ4_VERSION_RELEASE 0 /* for tweaks, bug-fixes, or development */
//****************************
// Simple Functions
//****************************
/**************************************
Tuning parameter
**************************************/
/*
* LZ4_MEMORY_USAGE :
* Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
* Increasing memory usage improves compression ratio
* Reduced memory usage can improve speed, due to cache effect
* Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
*/
#define LZ4_MEMORY_USAGE 14
int LZ4_compress (const char* source, char* dest, int isize);
int LZ4_uncompress (const char* source, char* dest, int osize);
/**************************************
Simple Functions
**************************************/
int LZ4_compress (const char* source, char* dest, int inputSize);
int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxOutputSize);
/*
LZ4_compress() :
Compresses 'isize' bytes from 'source' into 'dest'.
Compresses 'inputSize' 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()
isize : is the input size. Max supported value is ~1.9GB
inputSize : Max supported value is LZ4_MAX_INPUT_VALUE
return : the number of bytes written in buffer dest
or 0 if the compression fails
LZ4_uncompress() :
osize : is the output size, therefore the original size
return : the number of bytes read in the source buffer
If the source stream is malformed, the function will stop decoding and return a negative result, indicating the byte position of the faulty instruction
This function never writes outside of provided buffers, and never modifies input buffer.
note : destination buffer must be already allocated.
its size must be a minimum of 'osize' bytes.
LZ4_decompress_safe() :
compressedSize : is obviously the source size
maxOutputSize : is the size of the destination buffer, which must be already allocated.
return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
If the 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 :
it never writes outside of output buffer, and never reads outside of input buffer.
Therefore, it is protected against malicious data packets.
*/
//****************************
// Advanced Functions
//****************************
/*
Note :
Should you prefer to explicitly allocate compression-table memory using your own allocation method,
use the streaming functions provided below, simply reset the memory area between each call to LZ4_compress_continue()
*/
static inline int LZ4_compressBound(int isize) { return ((isize) + ((isize)/255) + 16); }
#define LZ4_COMPRESSBOUND( isize) ((isize) + ((isize)/255) + 16)
/**************************************
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)
/*
LZ4_compressBound() :
Provides the maximum size that LZ4 may output in a "worst case" scenario (input data not compressible)
primarily useful for memory allocation of output buffer.
inline function is recommended for the general case,
but macro is also provided when results need to be evaluated at compile time (such as table size allocation).
macro is also provided when result needs to be evaluated at compilation (such as stack memory allocation).
isize : is the input size. Max supported value is ~1.9GB
isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
return : maximum output size in a "worst case" scenario
note : this function is limited by "int" range (2^31-1)
or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
*/
int LZ4_compressBound(int isize);
int LZ4_compress_limitedOutput (const char* source, char* dest, int isize, int maxOutputSize);
/*
LZ4_compress_limitedOutput() :
Compress 'isize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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.
isize : is the input size. Max supported value is ~1.9GB
inputSize : 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 the compression fails
*/
int LZ4_compress_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
/*
LZ4_uncompress_unknownOutputSize() :
isize : is the input size, therefore the compressed size
maxOutputSize : is the size of the destination buffer (which must be already allocated)
return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
If the source stream is malformed, the function will stop decoding and return a negative result, indicating the byte position of the faulty instruction
This function never writes beyond dest + maxOutputSize, and is therefore protected against malicious data packets
note : Destination buffer must be already allocated.
This version is slightly slower than LZ4_uncompress()
LZ4_decompress_fast() :
originalSize : is the original and therefore uncompressed size
return : the number of bytes read from the source buffer (in other words, the compressed size)
If the source stream is malformed, the function will stop decoding and return a negative result.
Destination buffer must be already allocated. Its size must be a minimum of 'originalSize' bytes.
note : This function is a bit faster than LZ4_decompress_safe()
It provides fast decompression and fully respect memory boundaries for properly formed compressed data.
It does not provide full protection against intentionnally modified data stream.
Use this function in a trusted environment (data to decode comes from a trusted source).
*/
int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
/*
LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source'
into output buffer 'dest' of size 'maxOutputSize'.
The function tries to stop decompressing operation as soon as 'targetOutputSize' has been reached,
reducing decompression time.
return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
Note : this number can be < 'targetOutputSize' should the compressed block to decode be smaller.
Always control how many bytes were decoded.
If the source stream is detected malformed, the function will stop decoding and return a negative result.
This function never writes outside of output buffer, and never reads outside of input buffer. It is therefore protected against malicious data packets
*/
int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedSize, int targetOutputSize, int maxOutputSize);
/***********************************************
Experimental Streaming Compression Functions
***********************************************/
#define LZ4_STREAMSIZE_U32 ((1 << (LZ4_MEMORY_USAGE-2)) + 8)
#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U32 * sizeof(unsigned int))
/*
* LZ4_stream_t
* information structure to track an LZ4 stream.
* important : set this structure content to zero before first use !
*/
typedef struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
/*
* If you prefer dynamic allocation methods,
* LZ4_createStream
* provides a pointer (void*) towards an initialized LZ4_stream_t structure.
* LZ4_free just frees it.
*/
void* LZ4_createStream();
int LZ4_free (void* LZ4_stream);
/*
* 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 (same effect as init).
* Return : 1 if OK, 0 if error
*/
int LZ4_loadDict (void* LZ4_stream, 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.
*/
int LZ4_compress_continue (void* LZ4_stream, 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 (void* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
/*
* LZ4_saveDict
* If previously compressed data block is not guaranteed to remain at its previous memory location
* save it into a safe 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()
* Return : 1 if OK, 0 if error
* Note : any dictSize > 64 KB will be interpreted as 64KB.
*/
int LZ4_saveDict (void* LZ4_stream, char* safeBuffer, int dictSize);
/************************************************
Experimental Streaming Decompression Functions
************************************************/
#define LZ4_STREAMDECODESIZE_U32 4
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
/*
* LZ4_streamDecode_t
* information structure to track an LZ4 stream.
* important : set this structure content to zero before first use !
*/
typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
/*
* If you prefer dynamic allocation methods,
* LZ4_createStreamDecode()
* provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
* LZ4_free just frees it.
*/
void* LZ4_createStreamDecode();
int LZ4_free (void* LZ4_stream); /* yes, it's the same one as for compression */
/*
*_continue() :
These decoding functions allow decompression of multiple blocks in "streaming" mode.
Previously decoded blocks must still be available at the memory position where they were decoded.
If it's not possible, save the relevant part of decoded data into a safe buffer,
and indicate where it stands using LZ4_setDictDecode()
*/
int LZ4_decompress_safe_continue (void* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize);
int LZ4_decompress_fast_continue (void* LZ4_streamDecode, const char* source, char* dest, int originalSize);
/*
* LZ4_setDictDecode
* Use this function to instruct where to find the dictionary.
* This function can be used to specify a static dictionary,
* or to instruct where to find some previously decoded data saved into a different memory space.
* Setting a size of 0 is allowed (same effect as no dictionary).
* Return : 1 if OK, 0 if error
*/
int LZ4_setDictDecode (void* LZ4_streamDecode, const char* dictionary, int dictSize);
/*
Advanced decoding functions :
*_usingDict() :
These decoding functions work the same as
a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
all together into a single function call.
It doesn't use nor update an LZ4_streamDecode_t structure.
*/
int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize);
int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
/**************************************
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
*/
int LZ4_uncompress (const char* source, char* dest, int outputSize);
int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
/* Obsolete functions for externally allocated state; use streaming interface instead */
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);
/* 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);
/* 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);
#if defined (__cplusplus)

625
src/static_libs/lz4/lz4hc.c
View File

@ -1,6 +1,6 @@
/*
LZ4 HC - High Compression Mode of LZ4
Copyright (C) 2011-2012, Yann Collet.
Copyright (C) 2011-2014, 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
@ -32,98 +32,153 @@
*/
//**************************************
// CPU Feature Detection
//**************************************
// 32 or 64 bits ?
#if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) || defined(__amd64) || defined(__ppc64__) || defined(_WIN64) || defined(__LP64__) || defined(_LP64) ) // Detects 64 bits mode
/**************************************
Tuning Parameter
**************************************/
#define LZ4HC_DEFAULT_COMPRESSIONLEVEL 8
/**************************************
Memory routines
**************************************/
#include <stdlib.h> /* calloc, free */
#define ALLOCATOR(s) calloc(1,s)
#define FREEMEM free
#include <string.h> /* memset, memcpy */
#define MEM_INIT memset
/**************************************
CPU Feature Detection
**************************************/
/* 32 or 64 bits ? */
#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
|| defined(__powerpc64__) || defined(__powerpc64le__) \
|| defined(__ppc64__) || defined(__ppc64le__) \
|| defined(__PPC64__) || defined(__PPC64LE__) \
|| defined(__ia64) || defined(__itanium__) || defined(_M_IA64) ) /* Detects 64 bits mode */
# define LZ4_ARCH64 1
#else
# define LZ4_ARCH64 0
#endif
// Little Endian or Big Endian ?
#if (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN) || defined(_ARCH_PPC) || defined(__PPC__) || defined(__PPC) || defined(PPC) || defined(__powerpc__) || defined(__powerpc) || defined(powerpc) || ((defined(__BYTE_ORDER__)&&(__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))) )
/*
* Little Endian or Big Endian ?
* Overwrite the #define below if you know your architecture endianess
*/
#include <stdlib.h> /* Apparently required to detect endianess */
#if defined (__GLIBC__)
# include <endian.h>
# if (__BYTE_ORDER == __BIG_ENDIAN)
# define LZ4_BIG_ENDIAN 1
# endif
#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN))
# define LZ4_BIG_ENDIAN 1
#elif defined(__sparc) || defined(__sparc__) \
|| defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
|| defined(__hpux) || defined(__hppa) \
|| defined(_MIPSEB) || defined(__s390__)
# define LZ4_BIG_ENDIAN 1
#else
// Little Endian assumed. PDP Endian and other very rare endian format are unsupported.
/* Little Endian assumed. PDP Endian and other very rare endian format are unsupported. */
#endif
// Unaligned memory access is automatically enabled for "common" CPU, such as x86.
// For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected
// If you know your target CPU supports unaligned memory access, you may want to force this option manually to improve performance
/*
* Unaligned memory access is automatically enabled for "common" CPU, such as x86.
* For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected
* If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
*/
#if defined(__ARM_FEATURE_UNALIGNED)
# define LZ4_FORCE_UNALIGNED_ACCESS 1
#endif
/* Define this parameter if your target system or compiler does not support hardware bit count */
#if defined(_MSC_VER) && defined(_WIN32_WCE) /* Visual Studio for Windows CE does not support Hardware bit count */
# define LZ4_FORCE_SW_BITCOUNT
#endif
//**************************************
// Compiler Options
//**************************************
#if __STDC_VERSION__ >= 199901L // C99
/**************************************
Compiler Options
**************************************/
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
/* "restrict" is a known keyword */
#else
#define restrict // Disable restrict
# define restrict /* Disable restrict */
#endif
#ifdef _MSC_VER
#define inline __forceinline // Visual is not C99, but supports some kind of inline
#include <intrin.h> // For Visual 2005
# if LZ4_ARCH64 // 64-bit
# pragma intrinsic(_BitScanForward64) // For Visual 2005
# pragma intrinsic(_BitScanReverse64) // For Visual 2005
#ifdef _MSC_VER /* Visual Studio */
# define FORCE_INLINE static __forceinline
# include <intrin.h> /* For Visual 2005 */
# if LZ4_ARCH64 /* 64-bits */
# pragma intrinsic(_BitScanForward64) /* For Visual 2005 */
# pragma intrinsic(_BitScanReverse64) /* For Visual 2005 */
# else /* 32-bits */
# pragma intrinsic(_BitScanForward) /* For Visual 2005 */
# pragma intrinsic(_BitScanReverse) /* For Visual 2005 */
# endif
# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
# pragma warning(disable : 4701) /* disable: C4701: potentially uninitialized local variable used */
#else
# pragma intrinsic(_BitScanForward) // For Visual 2005
# pragma intrinsic(_BitScanReverse) // For Visual 2005
# ifdef __GNUC__
# define FORCE_INLINE static inline __attribute__((always_inline))
# else
# define FORCE_INLINE static inline
# endif
#endif
#ifdef _MSC_VER // Visual Studio
#ifdef _MSC_VER /* Visual Studio */
# define lz4_bswap16(x) _byteswap_ushort(x)
#else
# define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
#endif
//**************************************
// Includes
//**************************************
#include <stdlib.h> // calloc, free
#include <string.h> // memset, memcpy
/**************************************
Includes
**************************************/
#include "lz4hc.h"
#define ALLOCATOR(s) calloc(1,s)
#define FREEMEM free
#define MEM_INIT memset
#include "lz4.h"
//**************************************
// Basic Types
//**************************************
#if defined(_MSC_VER) // Visual Studio does not support 'stdint' natively
#define BYTE unsigned __int8
#define U16 unsigned __int16
#define U32 unsigned __int32
#define S32 __int32
#define U64 unsigned __int64
#else
/**************************************
Basic Types
**************************************/
#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
# include <stdint.h>
#define BYTE uint8_t
#define U16 uint16_t
#define U32 uint32_t
#define S32 int32_t
#define U64 uint64_t
typedef uint8_t BYTE;
typedef uint16_t U16;
typedef uint32_t U32;
typedef int32_t S32;
typedef uint64_t U64;
#else
typedef unsigned char BYTE;
typedef unsigned short U16;
typedef unsigned int U32;
typedef signed int S32;
typedef unsigned long long U64;
#endif
#ifndef LZ4_FORCE_UNALIGNED_ACCESS
#if defined(__GNUC__) && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
# define _PACKED __attribute__ ((packed))
#else
# define _PACKED
#endif
#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
# ifdef __IBMC__
# pragma pack(1)
# else
# pragma pack(push, 1)
# endif
#endif
typedef struct _U16_S { U16 v; } U16_S;
typedef struct _U32_S { U32 v; } U32_S;
typedef struct _U64_S { U64 v; } U64_S;
typedef struct _U16_S { U16 v; } _PACKED U16_S;
typedef struct _U32_S { U32 v; } _PACKED U32_S;
typedef struct _U64_S { U64 v; } _PACKED U64_S;
#ifndef LZ4_FORCE_UNALIGNED_ACCESS
#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
# pragma pack(pop)
#endif
@ -132,9 +187,9 @@ typedef struct _U64_S { U64 v; } U64_S;
#define A16(x) (((U16_S *)(x))->v)
//**************************************
// Constants
//**************************************
/**************************************
Constants
**************************************/
#define MINMATCH 4
#define DICTIONARY_LOGSIZE 16
@ -146,8 +201,6 @@ typedef struct _U64_S { U64 v; } U64_S;
#define HASHTABLESIZE (1 << HASH_LOG)
#define HASH_MASK (HASHTABLESIZE - 1)
#define MAX_NB_ATTEMPTS 256
#define ML_BITS 4
#define ML_MASK (size_t)((1U<<ML_BITS)-1)
#define RUN_BITS (8-ML_BITS)
@ -159,68 +212,71 @@ typedef struct _U64_S { U64 v; } U64_S;
#define MINLENGTH (MFLIMIT+1)
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
#define KB *(1U<<10)
#define MB *(1U<<20)
#define GB *(1U<<30)
//**************************************
// Architecture-specific macros
//**************************************
#if LZ4_ARCH64 // 64-bit
/**************************************
Architecture-specific macros
**************************************/
#if LZ4_ARCH64 /* 64-bit */
# define STEPSIZE 8
# define LZ4_COPYSTEP(s,d) A64(d) = A64(s); d+=8; s+=8;
# define LZ4_COPYPACKET(s,d) LZ4_COPYSTEP(s,d)
#define UARCH U64
# define AARCH A64
# define HTYPE U32
# define INITBASE(b,s) const BYTE* const b = s
#else // 32-bit
#else /* 32-bit */
# define STEPSIZE 4
# define LZ4_COPYSTEP(s,d) A32(d) = A32(s); d+=4; s+=4;
# define LZ4_COPYPACKET(s,d) LZ4_COPYSTEP(s,d); LZ4_COPYSTEP(s,d);
#define UARCH U32
# define AARCH A32
#define HTYPE const BYTE*
#define INITBASE(b,s) const int b = 0
# define HTYPE U32
# define INITBASE(b,s) const BYTE* const b = s
#endif
#if defined(LZ4_BIG_ENDIAN)
# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
# define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
#else // Little Endian
#else /* Little Endian */
# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
# define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
#endif
//************************************************************
// Local Types
//************************************************************
/**************************************
Local Types
**************************************/
typedef struct
{
const BYTE* inputBuffer;
const BYTE* base;
const BYTE* end;
HTYPE hashTable[HASHTABLESIZE];
U16 chainTable[MAXD];
const BYTE* nextToUpdate;
} LZ4HC_Data_Structure;
//**************************************
// Macros
//**************************************
/**************************************
Macros
**************************************/
#define LZ4_WILDCOPY(s,d,e) do { LZ4_COPYPACKET(s,d) } while (d<e);
#define LZ4_BLINDCOPY(s,d,l) { BYTE* e=d+l; LZ4_WILDCOPY(s,d,e); d=e; }
#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
#define HASH_VALUE(p) HASH_FUNCTION(*(U32*)(p))
#define HASH_VALUE(p) HASH_FUNCTION(A32(p))
#define HASH_POINTER(p) (HashTable[HASH_VALUE(p)] + base)
#define DELTANEXT(p) chainTable[(size_t)(p) & MAXD_MASK]
#define GETNEXT(p) ((p) - (size_t)DELTANEXT(p))
#define ADD_HASH(p) { size_t delta = (p) - HASH_POINTER(p); if (delta>MAX_DISTANCE) delta = MAX_DISTANCE; DELTANEXT(p) = (U16)delta; HashTable[HASH_VALUE(p)] = (p) - base; }
//**************************************
// Private functions
//**************************************
/**************************************
Private functions
**************************************/
#if LZ4_ARCH64
inline static int LZ4_NbCommonBytes (register U64 val)
FORCE_INLINE int LZ4_NbCommonBytes (register U64 val)
{
#if defined(LZ4_BIG_ENDIAN)
# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
@ -252,11 +308,11 @@ inline static int LZ4_NbCommonBytes (register U64 val)
#else
inline static int LZ4_NbCommonBytes (register U32 val)
FORCE_INLINE int LZ4_NbCommonBytes (register U32 val)
{
#if defined(LZ4_BIG_ENDIAN)
# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
unsigned long r = 0;
unsigned long r;
_BitScanReverse( &r, val );
return (int)(r>>3);
# elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
@ -269,7 +325,7 @@ inline static int LZ4_NbCommonBytes (register U32 val)
# endif
#else
# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
unsigned long r = 0;
unsigned long r;
_BitScanForward( &r, val );
return (int)(r>>3);
# elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
@ -284,34 +340,46 @@ inline static int LZ4_NbCommonBytes (register U32 val)
#endif
inline static int LZ4HC_Init (LZ4HC_Data_Structure* hc4, const BYTE* base)
int LZ4_sizeofStreamStateHC()
{
return sizeof(LZ4HC_Data_Structure);
}
FORCE_INLINE void LZ4_initHC (LZ4HC_Data_Structure* hc4, const BYTE* base)
{
MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
hc4->nextToUpdate = base + LZ4_ARCH64;
hc4->nextToUpdate = base + 1;
hc4->base = base;
return 1;
hc4->inputBuffer = base;
hc4->end = base;
}
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer)
{
if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1; /* Error : pointer is not aligned for pointer (32 or 64 bits) */
LZ4_initHC((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
return 0;
}
inline static void* LZ4HC_Create (const BYTE* base)
void* LZ4_createHC (const char* inputBuffer)
{
void* hc4 = ALLOCATOR(sizeof(LZ4HC_Data_Structure));
LZ4HC_Init (hc4, base);
LZ4_initHC ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
return hc4;
}
inline static int LZ4HC_Free (void** LZ4HC_Data)
int LZ4_freeHC (void* LZ4HC_Data)
{
FREEMEM(*LZ4HC_Data);
*LZ4HC_Data = NULL;
return (1);
FREEMEM(LZ4HC_Data);
return (0);
}
inline static void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
/* Update chains up to ip (excluded) */
FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
{
U16* chainTable = hc4->chainTable;
HTYPE* HashTable = hc4->hashTable;
@ -319,80 +387,149 @@ inline static void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
while(hc4->nextToUpdate < ip)
{
ADD_HASH(hc4->nextToUpdate);
const BYTE* const p = hc4->nextToUpdate;
size_t delta = (p) - HASH_POINTER(p);
if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
DELTANEXT(p) = (U16)delta;
HashTable[HASH_VALUE(p)] = (HTYPE)((p) - base);
hc4->nextToUpdate++;
}
}
inline static int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* const matchlimit, const BYTE** matchpos)
char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
{
LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
U32 distance = (U32)(hc4->end - hc4->inputBuffer) - 64 KB;
distance = (distance >> 16) << 16; /* Must be a multiple of 64 KB */
LZ4HC_Insert(hc4, hc4->end - MINMATCH);
memcpy((void*)(hc4->end - 64 KB - distance), (const void*)(hc4->end - 64 KB), 64 KB);
hc4->nextToUpdate -= distance;
hc4->base -= distance;
if ((U32)(hc4->inputBuffer - hc4->base) > 1 GB + 64 KB) /* Avoid overflow */
{
int i;
hc4->base += 1 GB;
for (i=0; i<HASHTABLESIZE; i++) hc4->hashTable[i] -= 1 GB;
}
hc4->end -= distance;
return (char*)(hc4->end);
}
FORCE_INLINE size_t LZ4HC_CommonLength (const BYTE* p1, const BYTE* p2, const BYTE* const matchlimit)
{
const BYTE* p1t = p1;
while (p1t<matchlimit-(STEPSIZE-1))
{
size_t diff = AARCH(p2) ^ AARCH(p1t);
if (!diff) { p1t+=STEPSIZE; p2+=STEPSIZE; continue; }
p1t += LZ4_NbCommonBytes(diff);
return (p1t - p1);
}
if (LZ4_ARCH64) if ((p1t<(matchlimit-3)) && (A32(p2) == A32(p1t))) { p1t+=4; p2+=4; }
if ((p1t<(matchlimit-1)) && (A16(p2) == A16(p1t))) { p1t+=2; p2+=2; }
if ((p1t<matchlimit) && (*p2 == *p1t)) p1t++;
return (p1t - p1);
}
FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* const matchlimit, const BYTE** matchpos, const int maxNbAttempts)
{
U16* const chainTable = hc4->chainTable;
HTYPE* const HashTable = hc4->hashTable;
const BYTE* ref;
INITBASE(base,hc4->base);
int nbAttempts=MAX_NB_ATTEMPTS;
int ml=0;
int nbAttempts=maxNbAttempts;
size_t repl=0, ml=0;
U16 delta=0; /* useless assignment, to remove an uninitialization warning */
// HC4 match finder
/* HC4 match finder */
LZ4HC_Insert(hc4, ip);
ref = HASH_POINTER(ip);
while ((ref >= (ip-MAX_DISTANCE)) && (nbAttempts))
#define REPEAT_OPTIMIZATION
#ifdef REPEAT_OPTIMIZATION
/* Detect repetitive sequences of length <= 4 */
if ((U32)(ip-ref) <= 4) /* potential repetition */
{
if (A32(ref) == A32(ip)) /* confirmed */
{
delta = (U16)(ip-ref);
repl = ml = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
*matchpos = ref;
}
ref = GETNEXT(ref);
}
#endif
while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
{
nbAttempts--;
if (*(ref+ml) == *(ip+ml))
if (*(U32*)ref == *(U32*)ip)
if (A32(ref) == A32(ip))
{
const BYTE* reft = ref+MINMATCH;
const BYTE* ipt = ip+MINMATCH;
while (ipt<matchlimit-(STEPSIZE-1))
{
UARCH diff = AARCH(reft) ^ AARCH(ipt);
if (!diff) { ipt+=STEPSIZE; reft+=STEPSIZE; continue; }
ipt += LZ4_NbCommonBytes(diff);
goto _endCount;
}
if (LZ4_ARCH64) if ((ipt<(matchlimit-3)) && (A32(reft) == A32(ipt))) { ipt+=4; reft+=4; }
if ((ipt<(matchlimit-1)) && (A16(reft) == A16(ipt))) { ipt+=2; reft+=2; }
if ((ipt<matchlimit) && (*reft == *ipt)) ipt++;
_endCount:
if (ipt-ip > ml) { ml = (int)(ipt-ip); *matchpos = ref; }
size_t mlt = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
if (mlt > ml) { ml = mlt; *matchpos = ref; }
}
ref = GETNEXT(ref);
}
return ml;
#ifdef REPEAT_OPTIMIZATION
/* Complete table */
if (repl)
{
const BYTE* ptr = ip;
const BYTE* end;
end = ip + repl - (MINMATCH-1);
while(ptr < end-delta)
{
DELTANEXT(ptr) = delta; /* Pre-Load */
ptr++;
}
do
{
DELTANEXT(ptr) = delta;
HashTable[HASH_VALUE(ptr)] = (HTYPE)((ptr) - base); /* Head of chain */
ptr++;
} while(ptr < end);
hc4->nextToUpdate = end;
}
#endif
return (int)ml;
}
inline static int LZ4HC_InsertAndGetWiderMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* startLimit, const BYTE* matchlimit, int longest, const BYTE** matchpos, const BYTE** startpos)
FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* startLimit, const BYTE* matchlimit, int longest, const BYTE** matchpos, const BYTE** startpos, const int maxNbAttempts)
{
U16* const chainTable = hc4->chainTable;
HTYPE* const HashTable = hc4->hashTable;
INITBASE(base,hc4->base);
const BYTE* ref;
int nbAttempts = MAX_NB_ATTEMPTS;
int nbAttempts = maxNbAttempts;
int delta = (int)(ip-startLimit);
// First Match
/* First Match */
LZ4HC_Insert(hc4, ip);
ref = HASH_POINTER(ip);
while ((ref >= ip-MAX_DISTANCE) && (ref >= hc4->base) && (nbAttempts))
while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
{
nbAttempts--;
if (*(startLimit + longest) == *(ref - delta + longest))
if (*(U32*)ref == *(U32*)ip)
if (A32(ref) == A32(ip))
{
#if 1
const BYTE* reft = ref+MINMATCH;
const BYTE* ipt = ip+MINMATCH;
const BYTE* startt = ip;
while (ipt<matchlimit-(STEPSIZE-1))
{
UARCH diff = AARCH(reft) ^ AARCH(ipt);
size_t diff = AARCH(reft) ^ AARCH(ipt);
if (!diff) { ipt+=STEPSIZE; reft+=STEPSIZE; continue; }
ipt += LZ4_NbCommonBytes(diff);
goto _endCount;
@ -401,9 +538,15 @@ inline static int LZ4HC_InsertAndGetWiderMatch (LZ4HC_Data_Structure* hc4, const
if ((ipt<(matchlimit-1)) && (A16(reft) == A16(ipt))) { ipt+=2; reft+=2; }
if ((ipt<matchlimit) && (*reft == *ipt)) ipt++;
_endCount:
reft = ref;
while ((startt>startLimit) && (reft > hc4->base) && (startt[-1] == reft[-1])) {startt--; reft--;}
#else
/* Easier for code maintenance, but unfortunately slower too */
const BYTE* startt = ip;
const BYTE* reft = ref;
const BYTE* ipt = ip + MINMATCH + LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit);
#endif
while ((startt>startLimit) && (reft > hc4->inputBuffer) && (startt[-1] == reft[-1])) {startt--; reft--;}
if ((ipt-startt) > longest)
{
@ -419,53 +562,69 @@ _endCount:
}
inline static int LZ4_encodeSequence(const BYTE** ip, BYTE** op, const BYTE** anchor, int ml, const BYTE* ref)
typedef enum { noLimit = 0, limitedOutput = 1 } limitedOutput_directive;
FORCE_INLINE int LZ4HC_encodeSequence (
const BYTE** ip,
BYTE** op,
const BYTE** anchor,
int matchLength,
const BYTE* ref,
limitedOutput_directive limitedOutputBuffer,
BYTE* oend)
{
int length, len;
int length;
BYTE* token;
// Encode Literal length
/* Encode Literal length */
length = (int)(*ip - *anchor);
token = (*op)++;
if (length>=(int)RUN_MASK) { *token=(RUN_MASK<<ML_BITS); len = length-RUN_MASK; for(; len > 254 ; len-=255) *(*op)++ = 255; *(*op)++ = (BYTE)len; }
else *token = (length<<ML_BITS);
if ((limitedOutputBuffer) && ((*op + length + (2 + 1 + LASTLITERALS) + (length>>8)) > oend)) return 1; /* Check output limit */
if (length>=(int)RUN_MASK) { int len; *token=(RUN_MASK<<ML_BITS); len = length-RUN_MASK; for(; len > 254 ; len-=255) *(*op)++ = 255; *(*op)++ = (BYTE)len; }
else *token = (BYTE)(length<<ML_BITS);
// Copy Literals
/* Copy Literals */
LZ4_BLINDCOPY(*anchor, *op, length);
// Encode Offset
/* Encode Offset */
LZ4_WRITE_LITTLEENDIAN_16(*op,(U16)(*ip-ref));
// Encode MatchLength
len = (int)(ml-MINMATCH);
if (len>=(int)ML_MASK) { *token+=ML_MASK; len-=ML_MASK; for(; len > 509 ; len-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (len > 254) { len-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)len; }
else *token += len;
/* Encode MatchLength */
length = (int)(matchLength-MINMATCH);
if ((limitedOutputBuffer) && (*op + (1 + LASTLITERALS) + (length>>8) > oend)) return 1; /* Check output limit */
if (length>=(int)ML_MASK) { *token+=ML_MASK; length-=ML_MASK; for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (length > 254) { length-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)length; }
else *token += (BYTE)(length);
// Prepare next loop
*ip += ml;
/* Prepare next loop */
*ip += matchLength;
*anchor = *ip;
return 0;
}
//****************************
// Compression CODE
//****************************
int LZ4_compressHCCtx(LZ4HC_Data_Structure* ctx,
#define MAX_COMPRESSION_LEVEL 16
static int LZ4HC_compress_generic (
void* ctxvoid,
const char* source,
char* dest,
int isize)
int inputSize,
int maxOutputSize,
int compressionLevel,
limitedOutput_directive limit
)
{
LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid;
const BYTE* ip = (const BYTE*) source;
const BYTE* anchor = ip;
const BYTE* const iend = ip + isize;
const BYTE* const iend = ip + inputSize;
const BYTE* const mflimit = iend - MFLIMIT;
const BYTE* const matchlimit = (iend - LASTLITERALS);
BYTE* op = (BYTE*) dest;
BYTE* const oend = op + maxOutputSize;
const int maxNbAttempts = compressionLevel > MAX_COMPRESSION_LEVEL ? 1 << MAX_COMPRESSION_LEVEL : compressionLevel ? 1<<(compressionLevel-1) : 1<<LZ4HC_DEFAULT_COMPRESSIONLEVEL;
int ml, ml2, ml3, ml0;
const BYTE* ref=NULL;
const BYTE* start2=NULL;
@ -475,33 +634,38 @@ int LZ4_compressHCCtx(LZ4HC_Data_Structure* ctx,
const BYTE* start0;
const BYTE* ref0;
/* Ensure blocks follow each other */
if (ip != ctx->end) return 0;
ctx->end += inputSize;
ip++;
// Main Loop
/* Main Loop */
while (ip < mflimit)
{
ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref));
ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref), maxNbAttempts);
if (!ml) { ip++; continue; }
// saved, in case we would skip too much
/* saved, in case we would skip too much */
start0 = ip;
ref0 = ref;
ml0 = ml;
_Search2:
if (ip+ml < mflimit)
ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2);
ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2, maxNbAttempts);
else ml2 = ml;
if (ml2 == ml) // No better match
if (ml2 == ml) /* No better match */
{
LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
continue;
}
if (start0 < ip)
{
if (start2 < ip + ml0) // empirical
if (start2 < ip + ml0) /* empirical */
{
ip = start0;
ref = ref0;
@ -509,8 +673,8 @@ _Search2:
}
}
// Here, start0==ip
if ((start2 - ip) < 3) // First Match too small : removed
/* Here, start0==ip */
if ((start2 - ip) < 3) /* First Match too small : removed */
{
ml = ml2;
ip = start2;
@ -519,9 +683,11 @@ _Search2:
}
_Search3:
// Currently we have :
// ml2 > ml1, and
// ip1+3 <= ip2 (usually < ip1+ml1)
/*
* Currently we have :
* ml2 > ml1, and
* ip1+3 <= ip2 (usually < ip1+ml1)
*/
if ((start2 - ip) < OPTIMAL_ML)
{
int correction;
@ -536,45 +702,26 @@ _Search3:
ml2 -= correction;
}
}
// Now, we have start2 = ip+new_ml, with new_ml=min(ml, OPTIMAL_ML=18)
/* Now, we have start2 = ip+new_ml, with new_ml = min(ml, OPTIMAL_ML=18) */
if (start2 + ml2 < mflimit)
ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3);
ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts);
else ml3 = ml2;
if (ml3 == ml2) // No better match : 2 sequences to encode
if (ml3 == ml2) /* No better match : 2 sequences to encode */
{
// ip & ref are known; Now for ml
if (start2 < ip+ml)
{
if ((start2 - ip) < OPTIMAL_ML)
{
int correction;
if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
if (ip+ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
correction = ml - (int)(start2 - ip);
if (correction > 0)
{
start2 += correction;
ref2 += correction;
ml2 -= correction;
}
}
else
{
ml = (int)(start2 - ip);
}
}
// Now, encode 2 sequences
LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
/* ip & ref are known; Now for ml */
if (start2 < ip+ml) ml = (int)(start2 - ip);
/* Now, encode 2 sequences */
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
ip = start2;
LZ4_encodeSequence(&ip, &op, &anchor, ml2, ref2);
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml2, ref2, limit, oend)) return 0;
continue;
}
if (start3 < ip+ml+3) // Not enough space for match 2 : remove it
if (start3 < ip+ml+3) /* Not enough space for match 2 : remove it */
{
if (start3 >= (ip+ml)) // can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1
if (start3 >= (ip+ml)) /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
{
if (start2 < ip+ml)
{
@ -590,7 +737,7 @@ _Search3:
}
}
LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
ip = start3;
ref = ref3;
ml = ml3;
@ -607,8 +754,10 @@ _Search3:
goto _Search3;
}
// OK, now we have 3 ascending matches; let's write at least the first one
// ip & ref are known; Now for ml
/*
* OK, now we have 3 ascending matches; let's write at least the first one
* ip & ref are known; Now for ml
*/
if (start2 < ip+ml)
{
if ((start2 - ip) < (int)ML_MASK)
@ -629,7 +778,7 @@ _Search3:
ml = (int)(start2 - ip);
}
}
LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
ip = start2;
ref = ref2;
@ -643,29 +792,101 @@ _Search3:
}
// Encode Last Literals
/* Encode Last Literals */
{
int lastRun = (int)(iend - anchor);
if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0; /* Check output limit */
if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
else *op++ = (lastRun<<ML_BITS);
else *op++ = (BYTE)(lastRun<<ML_BITS);
memcpy(op, anchor, iend - anchor);
op += iend-anchor;
}
// End
/* End */
return (int) (((char*)op)-dest);
}
int LZ4_compressHC(const char* source,
char* dest,
int isize)
int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel)
{
void* ctx = LZ4HC_Create((const BYTE*)source);
int result = LZ4_compressHCCtx(ctx, source, dest, isize);
LZ4HC_Free (&ctx);
void* ctx = LZ4_createHC(source);
int result;
if (ctx==NULL) return 0;
result = LZ4HC_compress_generic (ctx, source, dest, inputSize, 0, compressionLevel, noLimit);
LZ4_freeHC(ctx);
return result;
}
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)
{
void* ctx = LZ4_createHC(source);
int result;
if (ctx==NULL) return 0;
result = LZ4HC_compress_generic (ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
LZ4_freeHC(ctx);
return result;
}
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() { return sizeof(LZ4HC_Data_Structure); }
int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel)
{
if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
return LZ4HC_compress_generic (state, source, dest, inputSize, 0, 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)
{
if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
}
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); }
/****************************
Stream functions
****************************/
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_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);
}
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_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
{
return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
}

121
src/static_libs/lz4/lz4hc.h
View File

@ -1,7 +1,7 @@
/*
LZ4 HC - High Compression Mode of LZ4
Header File
Copyright (C) 2011-2012, Yann Collet.
Copyright (C) 2011-2014, 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
@ -39,19 +39,132 @@ extern "C" {
#endif
int LZ4_compressHC (const char* source, char* dest, int isize);
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 regular LZ4 source code (see "lz4.h") (BSD license)
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 compressions 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 area instead of allocating their own (on stack, or on heap).
*/
/**************************************
Streaming Functions
**************************************/
/* Note : these streaming functions still follows the older model */
void* LZ4_createHC (const char* inputBuffer);
int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize);
int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize);
char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
int LZ4_freeHC (void* LZ4HC_Data);
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);
/*
These functions allow the compression of dependent blocks, where each block benefits from prior 64 KB within preceding blocks.
In order to achieve this, it is necessary to start creating the LZ4HC Data Structure, thanks to the function :
void* LZ4_createHC (const char* inputBuffer);
The result of the function is the (void*) pointer on the LZ4HC Data Structure.
This pointer will be needed in all other functions.
If the pointer returned is NULL, then the allocation has failed, and compression must be aborted.
The only parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
The input buffer must be already allocated, and size at least 192KB.
'inputBuffer' will also be the 'const char* source' of the first block.
All blocks are expected to lay next to each other within the input buffer, starting from 'inputBuffer'.
To compress each block, use either LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue().
Their behavior are identical to LZ4_compressHC() or LZ4_compressHC_limitedOutput(),
but require the LZ4HC Data Structure as their first argument, and check that each block starts right after the previous one.
If next block does not begin immediately after the previous one, the compression will fail (return 0).
When it's no longer possible to lay the next block after the previous one (not enough space left into input buffer), a call to :
char* LZ4_slideInputBufferHC(void* LZ4HC_Data);
must be performed. It will typically copy the latest 64KB of input at the beginning of input buffer.
Note that, for this function to work properly, minimum size of an input buffer must be 192KB.
==> The memory position where the next input data block must start is provided as the result of the function.
Compression can then resume, using LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(), as usual.
When compression is completed, a call to LZ4_freeHC() will release the memory used by the LZ4HC Data Structure.
*/
int LZ4_sizeofStreamStateHC(void);
int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
/*
These functions achieve the same result as :
void* LZ4_createHC (const char* inputBuffer);
They are provided here to allow the user program to allocate memory using its own routines.
To know how much space must be allocated, use LZ4_sizeofStreamStateHC();
Note also that space must be aligned for pointers (32 or 64 bits).
Once space is allocated, you must initialize it using : LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
void* state is a pointer to the space allocated.
It must be aligned for pointers (32 or 64 bits), and be large enough.
The parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
The input buffer must be already allocated, and size at least 192KB.
'inputBuffer' will also be the 'const char* source' of the first block.
The same space can be re-used multiple times, just by initializing it each time with LZ4_resetStreamState().
return value of LZ4_resetStreamStateHC() must be 0 is OK.
Any other value means there was an error (typically, state is not aligned for pointers (32 or 64 bits)).
*/