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author | Yann Collet <yann.collet.73@gmail.com> | 2014-11-30 22:32:12 (GMT) |
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committer | Yann Collet <yann.collet.73@gmail.com> | 2014-11-30 22:32:12 (GMT) |
commit | d008c87151abf8c36a9f98d28461bf6f3dfdc6ae (patch) | |
tree | f9cbf5a95577a4bbbe610b1dca00e1f332e56623 /lz4.c | |
parent | 80030c16fff7a8a5dae18cf2b1ab5da508137847 (diff) | |
download | lz4-d008c87151abf8c36a9f98d28461bf6f3dfdc6ae.zip lz4-d008c87151abf8c36a9f98d28461bf6f3dfdc6ae.tar.gz lz4-d008c87151abf8c36a9f98d28461bf6f3dfdc6ae.tar.bz2 |
New directory structure : library source files into /lib directory
Diffstat (limited to 'lz4.c')
-rw-r--r-- | lz4.c | 1365 |
1 files changed, 0 insertions, 1365 deletions
@@ -1,1365 +0,0 @@ -/* - LZ4 - Fast LZ compression algorithm - 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 - modification, are permitted provided that the following conditions are - met: - - * Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following disclaimer - in the documentation and/or other materials provided with the - distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - You can contact the author at : - - LZ4 source repository : http://code.google.com/p/lz4/ - - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c -*/ - - -/************************************** - Tuning parameters -**************************************/ -/* - * HEAPMODE : - * Select how default compression functions will allocate memory for their hash table, - * in memory stack (0:default, fastest), or in memory heap (1:requires malloc()). - */ -#define HEAPMODE 0 - -/* - * CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS : - * By default, the source code expects the compiler to correctly optimize - * 4-bytes and 8-bytes read on architectures able to handle it efficiently. - * This is not always the case. In some circumstances (ARM notably), - * the compiler will issue cautious code even when target is able to correctly handle unaligned memory accesses. - * - * You can force the compiler to use unaligned memory access by uncommenting the line below. - * One of the below scenarios will happen : - * 1 - Your target CPU correctly handle unaligned access, and was not well optimized by compiler (good case). - * You will witness large performance improvements (+50% and up). - * Keep the line uncommented and send a word to upstream (https://groups.google.com/forum/#!forum/lz4c) - * The goal is to automatically detect such situations by adding your target CPU within an exception list. - * 2 - Your target CPU correctly handle unaligned access, and was already already optimized by compiler - * No change will be experienced. - * 3 - Your target CPU inefficiently handle unaligned access. - * You will experience a performance loss. Comment back the line. - * 4 - Your target CPU does not handle unaligned access. - * Program will crash. - * If uncommenting results in better performance (case 1) - * please report your configuration to upstream (https://groups.google.com/forum/#!forum/lz4c) - * An automatic detection macro will be added to match your case within future versions of the library. - */ -/* #define CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS 1 */ - - -/************************************** - CPU Feature Detection -**************************************/ -/* - * Automated efficient unaligned memory access detection - * Based on known hardware architectures - * This list will be updated thanks to feedbacks - */ -#if defined(CPU_HAS_EFFICIENT_UNALIGNED_MEMORY_ACCESS) \ - || defined(__ARM_FEATURE_UNALIGNED) \ - || defined(__i386__) || defined(__x86_64__) \ - || defined(_M_IX86) || defined(_M_X64) \ - || defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_8__) \ - || (defined(_M_ARM) && (_M_ARM >= 7)) -# define LZ4_UNALIGNED_ACCESS 1 -#else -# define LZ4_UNALIGNED_ACCESS 0 -#endif - -/* - * LZ4_FORCE_SW_BITCOUNT - * 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 defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ -/* "restrict" is a known keyword */ -#else -# define restrict /* Disable restrict */ -#endif - -#ifdef _MSC_VER /* Visual Studio */ -# define FORCE_INLINE static __forceinline -# include <intrin.h> -# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */ -#else -# ifdef __GNUC__ -# define FORCE_INLINE static inline __attribute__((always_inline)) -# else -# define FORCE_INLINE static inline -# endif -#endif - -#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) - -#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) -# define expect(expr,value) (__builtin_expect ((expr),(value)) ) -#else -# define expect(expr,value) (expr) -#endif - -#define likely(expr) expect((expr) != 0, 1) -#define unlikely(expr) expect((expr) != 0, 0) - - -/************************************** - Memory routines -**************************************/ -#include <stdlib.h> /* malloc, calloc, free */ -#define ALLOCATOR(n,s) calloc(n,s) -#define FREEMEM free -#include <string.h> /* memset, memcpy */ -#define MEM_INIT memset - - -/************************************** - Includes -**************************************/ -#include "lz4.h" - - -/************************************** - Basic Types -**************************************/ -#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */ -# include <stdint.h> - 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 - - -/************************************** - Reading and writing into memory -**************************************/ -#define STEPSIZE sizeof(size_t) - -static unsigned LZ4_64bits(void) { return sizeof(void*)==8; } - -static unsigned LZ4_isLittleEndian(void) -{ - const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ - return one.c[0]; -} - - -static U16 LZ4_readLE16(const void* memPtr) -{ - if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian())) - return *(U16*)memPtr; - else - { - const BYTE* p = memPtr; - return (U16)((U16)p[0] + (p[1]<<8)); - } -} - -static void LZ4_writeLE16(void* memPtr, U16 value) -{ - if ((LZ4_UNALIGNED_ACCESS) && (LZ4_isLittleEndian())) - { - *(U16*)memPtr = value; - return; - } - else - { - BYTE* p = memPtr; - p[0] = (BYTE) value; - p[1] = (BYTE)(value>>8); - } -} - - -static U16 LZ4_read16(const void* memPtr) -{ - if (LZ4_UNALIGNED_ACCESS) - return *(U16*)memPtr; - else - { - U16 val16; - memcpy(&val16, memPtr, 2); - return val16; - } -} - -static U32 LZ4_read32(const void* memPtr) -{ - if (LZ4_UNALIGNED_ACCESS) - return *(U32*)memPtr; - else - { - U32 val32; - memcpy(&val32, memPtr, 4); - return val32; - } -} - -static U64 LZ4_read64(const void* memPtr) -{ - if (LZ4_UNALIGNED_ACCESS) - return *(U64*)memPtr; - else - { - U64 val64; - memcpy(&val64, memPtr, 8); - return val64; - } -} - -static size_t LZ4_read_ARCH(const void* p) -{ - if (LZ4_64bits()) - return (size_t)LZ4_read64(p); - else - return (size_t)LZ4_read32(p); -} - - -static void LZ4_copy4(void* dstPtr, const void* srcPtr) -{ - if (LZ4_UNALIGNED_ACCESS) - { - *(U32*)dstPtr = *(U32*)srcPtr; - return; - } - memcpy(dstPtr, srcPtr, 4); -} - -static void LZ4_copy8(void* dstPtr, const void* srcPtr) -{ - if (LZ4_UNALIGNED_ACCESS) - { - if (LZ4_64bits()) - *(U64*)dstPtr = *(U64*)srcPtr; - else - ((U32*)dstPtr)[0] = ((U32*)srcPtr)[0], - ((U32*)dstPtr)[1] = ((U32*)srcPtr)[1]; - return; - } - memcpy(dstPtr, srcPtr, 8); -} - -/* customized version of memcpy, which may overwrite up to 7 bytes beyond dstEnd */ -static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd) -{ - BYTE* d = dstPtr; - const BYTE* s = srcPtr; - BYTE* e = dstEnd; - do { LZ4_copy8(d,s); d+=8; s+=8; } while (d<e); -} - - -/************************************** - Common Constants -**************************************/ -#define MINMATCH 4 - -#define COPYLENGTH 8 -#define LASTLITERALS 5 -#define MFLIMIT (COPYLENGTH+MINMATCH) -static const int LZ4_minLength = (MFLIMIT+1); - -#define KB *(1 <<10) -#define MB *(1 <<20) -#define GB *(1U<<30) - -#define MAXD_LOG 16 -#define MAX_DISTANCE ((1 << MAXD_LOG) - 1) - -#define ML_BITS 4 -#define ML_MASK ((1U<<ML_BITS)-1) -#define RUN_BITS (8-ML_BITS) -#define RUN_MASK ((1U<<RUN_BITS)-1) - - -/************************************** - Common Utils -**************************************/ -#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */ - - -/******************************** - Common functions -********************************/ -static unsigned LZ4_NbCommonBytes (register size_t val) -{ - if (LZ4_isLittleEndian()) - { - if (LZ4_64bits()) - { -# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) - unsigned long r = 0; - _BitScanForward64( &r, (U64)val ); - return (int)(r>>3); -# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) - return (__builtin_ctzll((U64)val) >> 3); -# else - 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 }; - return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58]; -# endif - } - else /* 32 bits */ - { -# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) - unsigned long r; - _BitScanForward( &r, (U32)val ); - return (int)(r>>3); -# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) - return (__builtin_ctz((U32)val) >> 3); -# else - 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 }; - return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27]; -# endif - } - } - else /* Big Endian CPU */ - { - if (LZ4_64bits()) - { -# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) - unsigned long r = 0; - _BitScanReverse64( &r, val ); - return (unsigned)(r>>3); -# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) - return (__builtin_clzll(val) >> 3); -# else - unsigned r; - if (!(val>>32)) { r=4; } else { r=0; val>>=32; } - if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; } - r += (!val); - return r; -# endif - } - else /* 32 bits */ - { -# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT) - unsigned long r = 0; - _BitScanReverse( &r, (unsigned long)val ); - return (unsigned)(r>>3); -# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT) - return (__builtin_clz(val) >> 3); -# else - unsigned r; - if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; } - r += (!val); - return r; -# endif - } - } -} - -static unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit) -{ - const BYTE* const pStart = pIn; - - while (likely(pIn<pInLimit-(STEPSIZE-1))) - { - size_t diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn); - if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; } - pIn += LZ4_NbCommonBytes(diff); - return (unsigned)(pIn - pStart); - } - if (LZ4_64bits()) if ((pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; } - if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; } - if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++; - - return (unsigned)(pIn - pStart); -} - - -#ifndef LZ4_COMMONDEFS_ONLY -/************************************** - Local Common Constants -**************************************/ -#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2) -#define HASHTABLESIZE (1 << LZ4_MEMORY_USAGE) -#define HASH_SIZE_U32 (1 << LZ4_HASHLOG) - -#define LZ4_64KLIMIT ((64 KB) + (MFLIMIT-1)) -#define SKIPSTRENGTH 6 /* Increasing this value will make the compression run slower on incompressible data */ - -#define MAXD_LOG 16 -#define MAX_DISTANCE ((1 << MAXD_LOG) - 1) - - -/************************************** - Local Utils -**************************************/ -int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; } -int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); } - - -/************************************** - Local Structures and types -**************************************/ -typedef struct { - U32 hashTable[HASH_SIZE_U32]; - U32 currentOffset; - U32 initCheck; - const BYTE* dictionary; - const BYTE* bufferStart; - U32 dictSize; -} LZ4_stream_t_internal; - -typedef enum { notLimited = 0, limitedOutput = 1 } limitedOutput_directive; -typedef enum { byPtr, byU32, byU16 } tableType_t; - -typedef enum { noDict = 0, withPrefix64k, usingExtDict } dict_directive; -typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive; - -typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive; -typedef enum { full = 0, partial = 1 } earlyEnd_directive; - - - -/******************************** - Compression functions -********************************/ - -static U32 LZ4_hashSequence(U32 sequence, tableType_t tableType) -{ - if (tableType == byU16) - return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1))); - else - 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 void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) -{ - switch (tableType) - { - case byPtr: { const BYTE** hashTable = (const BYTE**) tableBase; hashTable[h] = p; return; } - case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); return; } - case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); return; } - } -} - -static void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) -{ - U32 h = LZ4_hashPosition(p, tableType); - LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase); -} - -static const BYTE* LZ4_getPositionOnHash(U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase) -{ - if (tableType == byPtr) { const BYTE** hashTable = (const BYTE**) tableBase; return hashTable[h]; } - if (tableType == byU32) { U32* hashTable = (U32*) tableBase; return hashTable[h] + srcBase; } - { U16* hashTable = (U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */ -} - -static const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase) -{ - U32 h = LZ4_hashPosition(p, tableType); - 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 tableType, - dict_directive dict, - dictIssue_directive dictIssue) -{ - LZ4_stream_t_internal* const dictPtr = (LZ4_stream_t_internal*)ctx; - - const BYTE* ip = (const BYTE*) source; - const BYTE* base; - const BYTE* lowLimit; - const BYTE* const lowRefLimit = ip - dictPtr->dictSize; - const BYTE* const dictionary = dictPtr->dictionary; - const BYTE* const dictEnd = dictionary + dictPtr->dictSize; - const size_t dictDelta = dictEnd - (const BYTE*)source; - const BYTE* anchor = (const BYTE*) source; - const BYTE* const iend = ip + inputSize; - const BYTE* const mflimit = iend - MFLIMIT; - const BYTE* const matchlimit = iend - LASTLITERALS; - - BYTE* op = (BYTE*) dest; - BYTE* const olimit = op + maxOutputSize; - - const int skipStrength = SKIPSTRENGTH; - U32 forwardH; - size_t refDelta=0; - - /* Init conditions */ - if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */ - switch(dict) - { - case noDict: - default: - base = (const BYTE*)source; - lowLimit = (const BYTE*)source; - break; - case withPrefix64k: - base = (const BYTE*)source - dictPtr->currentOffset; - lowLimit = (const BYTE*)source - dictPtr->dictSize; - break; - case usingExtDict: - base = (const BYTE*)source - dictPtr->currentOffset; - lowLimit = (const BYTE*)source; - break; - } - if ((tableType == byU16) && (inputSize>=(int)LZ4_64KLIMIT)) return 0; /* Size too large (not within 64K limit) */ - if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */ - - /* First Byte */ - LZ4_putPosition(ip, ctx, tableType, base); - ip++; forwardH = LZ4_hashPosition(ip, tableType); - - /* Main Loop */ - for ( ; ; ) - { - const BYTE* ref; - BYTE* token; - { - const BYTE* forwardIp = ip; - unsigned step=1; - unsigned searchMatchNb = (1U << skipStrength); - - /* Find a match */ - do { - U32 h = forwardH; - ip = forwardIp; - forwardIp += step; - step = searchMatchNb++ >> skipStrength; - - if (unlikely(forwardIp > mflimit)) goto _last_literals; - - ref = LZ4_getPositionOnHash(h, ctx, tableType, base); - if (dict==usingExtDict) - { - if (ref<(const BYTE*)source) - { - refDelta = dictDelta; - lowLimit = dictionary; - } - else - { - refDelta = 0; - lowLimit = (const BYTE*)source; - } - } - forwardH = LZ4_hashPosition(forwardIp, tableType); - LZ4_putPositionOnHash(ip, h, ctx, tableType, base); - - } while ( ((dictIssue==dictSmall) ? (ref < lowRefLimit) : 0) - || ((tableType==byU16) ? 0 : (ref + MAX_DISTANCE < ip)) - || (LZ4_read32(ref+refDelta) != LZ4_read32(ip)) ); - } - - /* Catch up */ - while ((ip>anchor) && (ref+refDelta > lowLimit) && (unlikely(ip[-1]==ref[refDelta-1]))) { ip--; ref--; } - - { - /* Encode Literal length */ - unsigned litLength = (unsigned)(ip - anchor); - token = op++; - if ((outputLimited) && (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit))) - return 0; /* Check output limit */ - if (litLength>=RUN_MASK) - { - int len = (int)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-ref)); op+=2; - - /* Encode MatchLength */ - { - unsigned matchLength; - - if ((dict==usingExtDict) && (lowLimit==dictionary)) - { - const BYTE* limit; - ref += refDelta; - limit = ip + (dictEnd-ref); - if (limit > matchlimit) limit = matchlimit; - matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, limit); - ip += MINMATCH + matchLength; - if (ip==limit) - { - unsigned more = LZ4_count(ip, (const BYTE*)source, matchlimit); - matchLength += more; - ip += more; - } - } - else - { - matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, matchlimit); - ip += MINMATCH + matchLength; - } - - if (matchLength>=ML_MASK) - { - if ((outputLimited) && (unlikely(op + (1 + LASTLITERALS) + (matchLength>>8) > olimit))) - return 0; /* Check output limit */ - *token += ML_MASK; - matchLength -= ML_MASK; - for (; matchLength >= 510 ; matchLength-=510) { *op++ = 255; *op++ = 255; } - if (matchLength >= 255) { matchLength-=255; *op++ = 255; } - *op++ = (BYTE)matchLength; - } - else *token += (BYTE)(matchLength); - } - - anchor = ip; - - /* Test end of chunk */ - if (ip > mflimit) break; - - /* Fill table */ - LZ4_putPosition(ip-2, ctx, tableType, base); - - /* Test next position */ - ref = LZ4_getPosition(ip, ctx, tableType, base); - if (dict==usingExtDict) - { - if (ref<(const BYTE*)source) - { - refDelta = dictDelta; - lowLimit = dictionary; - } - else - { - refDelta = 0; - lowLimit = (const BYTE*)source; - } - } - LZ4_putPosition(ip, ctx, tableType, base); - if ( ((dictIssue==dictSmall) ? (ref>=lowRefLimit) : 1) - && (ref+MAX_DISTANCE>=ip) - && (LZ4_read32(ref+refDelta)==LZ4_read32(ip)) ) - { token=op++; *token=0; goto _next_match; } - - /* Prepare next loop */ - forwardH = LZ4_hashPosition(++ip, tableType); - } - -_last_literals: - /* Encode Last Literals */ - { - int lastRun = (int)(iend - anchor); - if ((outputLimited) && (((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 >= 255 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; } - else *op++ = (BYTE)(lastRun<<ML_BITS); - memcpy(op, anchor, iend - anchor); - op += iend-anchor; - } - - /* End */ - return (int) (((char*)op)-dest); -} - - -int LZ4_compress(const char* source, char* dest, int inputSize) -{ -#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; - - if (inputSize < (int)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); - -#if (HEAPMODE) - FREEMEM(ctx); -#endif - return result; -} - -int LZ4_compress_limitedOutput(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; - - if (inputSize < (int)LZ4_64KLIMIT) - result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue); - else - result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue); - -#if (HEAPMODE) - FREEMEM(ctx); -#endif - return result; -} - - -/***************************************** - 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)); -} - -LZ4_stream_t* LZ4_createStream(void) -{ - LZ4_stream_t* lz4s = (LZ4_stream_t*)ALLOCATOR(8, LZ4_STREAMSIZE_U64); - LZ4_STATIC_ASSERT(LZ4_STREAMSIZE >= sizeof(LZ4_stream_t_internal)); /* A compilation error here means LZ4_STREAMSIZE is not large enough */ - LZ4_resetStream(lz4s); - return lz4s; -} - -int LZ4_freeStream (LZ4_stream_t* LZ4_stream) -{ - FREEMEM(LZ4_stream); - return (0); -} - - -int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) -{ - LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; - const BYTE* p = (const BYTE*)dictionary; - const BYTE* const dictEnd = p + dictSize; - const BYTE* base; - - if (dict->initCheck) LZ4_resetStream(LZ4_dict); /* Uninitialized structure detected */ - - if (dictSize < MINMATCH) - { - dict->dictionary = NULL; - dict->dictSize = 0; - return 0; - } - - if (p <= dictEnd - 64 KB) p = dictEnd - 64 KB; - base = p - dict->currentOffset; - dict->dictionary = p; - dict->dictSize = (U32)(dictEnd - p); - dict->currentOffset += dict->dictSize; - - while (p <= dictEnd-MINMATCH) - { - LZ4_putPosition(p, dict, byU32, base); - p+=3; - } - - return dict->dictSize; -} - - -static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src) -{ - if ((LZ4_dict->currentOffset > 0x80000000) || - ((size_t)LZ4_dict->currentOffset > (size_t)src)) /* address space overflow */ - { - /* rescale hash table */ - U32 delta = LZ4_dict->currentOffset - 64 KB; - const BYTE* dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize; - int i; - for (i=0; i<HASH_SIZE_U32; i++) - { - if (LZ4_dict->hashTable[i] < delta) LZ4_dict->hashTable[i]=0; - else LZ4_dict->hashTable[i] -= delta; - } - LZ4_dict->currentOffset = 64 KB; - if (LZ4_dict->dictSize > 64 KB) LZ4_dict->dictSize = 64 KB; - LZ4_dict->dictionary = dictEnd - LZ4_dict->dictSize; - } -} - - -FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* source, char* dest, int inputSize, - int maxOutputSize, limitedOutput_directive limit) -{ - LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_stream; - const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; - - const BYTE* smallest = (const BYTE*) source; - if (streamPtr->initCheck) return 0; /* Uninitialized structure detected */ - if ((streamPtr->dictSize>0) && (smallest>dictEnd)) smallest = dictEnd; - LZ4_renormDictT(streamPtr, smallest); - - /* Check overlapping input/dictionary space */ - { - const BYTE* sourceEnd = (const BYTE*) source + inputSize; - if ((sourceEnd > streamPtr->dictionary) && (sourceEnd < dictEnd)) - { - streamPtr->dictSize = (U32)(dictEnd - sourceEnd); - if (streamPtr->dictSize > 64 KB) streamPtr->dictSize = 64 KB; - if (streamPtr->dictSize < 4) streamPtr->dictSize = 0; - streamPtr->dictionary = dictEnd - streamPtr->dictSize; - } - } - - /* prefix mode : source data follows dictionary */ - if (dictEnd == (const BYTE*)source) - { - 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); - else - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, noDictIssue); - streamPtr->dictSize += (U32)inputSize; - streamPtr->currentOffset += (U32)inputSize; - return result; - } - - /* external dictionary mode */ - { - 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); - else - result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, noDictIssue); - streamPtr->dictionary = (const BYTE*)source; - streamPtr->dictSize = (U32)inputSize; - streamPtr->currentOffset += (U32)inputSize; - return result; - } -} - -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 */ -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; - int result; - const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize; - - const BYTE* smallest = dictEnd; - 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); - - streamPtr->dictionary = (const BYTE*)source; - streamPtr->dictSize = (U32)inputSize; - streamPtr->currentOffset += (U32)inputSize; - - return result; -} - - -int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize) -{ - LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict; - const BYTE* previousDictEnd = dict->dictionary + dict->dictSize; - - if ((U32)dictSize > 64 KB) dictSize = 64 KB; /* useless to define a dictionary > 64 KB */ - if ((U32)dictSize > dict->dictSize) dictSize = dict->dictSize; - - memmove(safeBuffer, previousDictEnd - dictSize, dictSize); - - dict->dictionary = (const BYTE*)safeBuffer; - dict->dictSize = (U32)dictSize; - - return dictSize; -} - - - -/**************************** - Decompression functions -****************************/ -/* - * This generic decompression function cover all use cases. - * It shall be instantiated several times, using different sets of directives - * Note that it is essential this generic function is really inlined, - * in order to remove useless branches during compilation optimization. - */ -FORCE_INLINE int LZ4_decompress_generic( - const char* const source, - char* const dest, - int inputSize, - int outputSize, /* If endOnInput==endOnInputSize, this value is the max size of Output Buffer. */ - - int endOnInput, /* endOnOutputSize, endOnInputSize */ - int partialDecoding, /* full, partial */ - int targetOutputSize, /* only used if partialDecoding==partial */ - int dict, /* noDict, withPrefix64k, usingExtDict */ - const BYTE* const lowPrefix, /* == dest if dict == noDict */ - const BYTE* const dictStart, /* only if dict==usingExtDict */ - const size_t dictSize /* note : = 0 if noDict */ - ) -{ - /* Local Variables */ - const BYTE* restrict ip = (const BYTE*) source; - const BYTE* const iend = ip + inputSize; - - BYTE* op = (BYTE*) dest; - BYTE* const oend = op + outputSize; - BYTE* cpy; - BYTE* oexit = op + targetOutputSize; - const BYTE* const lowLimit = lowPrefix - dictSize; - - const BYTE* const dictEnd = (const BYTE*)dictStart + dictSize; - const size_t dec32table[] = {4, 1, 2, 1, 4, 4, 4, 4}; - const size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3}; - - const int safeDecode = (endOnInput==endOnInputSize); - const int checkOffset = ((safeDecode) && (dictSize < (int)(64 KB))); - - - /* Special cases */ - if ((partialDecoding) && (oexit> oend-MFLIMIT)) oexit = oend-MFLIMIT; /* targetOutputSize too high => decode everything */ - if ((endOnInput) && (unlikely(outputSize==0))) return ((inputSize==1) && (*ip==0)) ? 0 : -1; /* Empty output buffer */ - if ((!endOnInput) && (unlikely(outputSize==0))) return (*ip==0?1:-1); - - - /* Main Loop */ - while (1) - { - unsigned token; - size_t length; - const BYTE* match; - - /* get literal length */ - token = *ip++; - if ((length=(token>>ML_BITS)) == RUN_MASK) - { - unsigned s; - do - { - s = *ip++; - length += s; - } - while (likely((endOnInput)?ip<iend-RUN_MASK:1) && (s==255)); - if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)(op))) goto _output_error; /* overflow detection */ - if ((safeDecode) && unlikely((size_t)(ip+length)<(size_t)(ip))) goto _output_error; /* overflow detection */ - } - - /* copy literals */ - cpy = op+length; - if (((endOnInput) && ((cpy>(partialDecoding?oexit:oend-MFLIMIT)) || (ip+length>iend-(2+1+LASTLITERALS))) ) - || ((!endOnInput) && (cpy>oend-COPYLENGTH))) - { - if (partialDecoding) - { - if (cpy > oend) goto _output_error; /* Error : write attempt beyond end of output buffer */ - if ((endOnInput) && (ip+length > iend)) goto _output_error; /* Error : read attempt beyond end of input buffer */ - } - else - { - if ((!endOnInput) && (cpy != oend)) goto _output_error; /* Error : block decoding must stop exactly there */ - if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) goto _output_error; /* Error : input must be consumed */ - } - memcpy(op, ip, length); - ip += length; - op += length; - break; /* Necessarily EOF, due to parsing restrictions */ - } - LZ4_wildCopy(op, ip, cpy); - ip += length; op = cpy; - - /* get offset */ - match = cpy - LZ4_readLE16(ip); ip+=2; - if ((checkOffset) && (unlikely(match < lowLimit))) goto _output_error; /* Error : offset outside destination buffer */ - - /* get matchlength */ - length = token & ML_MASK; - if (length == ML_MASK) - { - unsigned s; - do - { - if ((endOnInput) && (ip > iend-LASTLITERALS)) goto _output_error; - s = *ip++; - length += s; - } while (s==255); - if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)op)) goto _output_error; /* overflow detection */ - } - length += MINMATCH; - - /* check external dictionary */ - if ((dict==usingExtDict) && (match < lowPrefix)) - { - if (unlikely(op+length > oend-LASTLITERALS)) goto _output_error; /* doesn't respect parsing restriction */ - - if (length <= (size_t)(lowPrefix-match)) - { - /* match can be copied as a single segment from external dictionary */ - match = dictEnd - (lowPrefix-match); - memcpy(op, match, length); - op += length; - } - else - { - /* match encompass external dictionary and current segment */ - size_t copySize = (size_t)(lowPrefix-match); - memcpy(op, dictEnd - copySize, copySize); - op += copySize; - copySize = length - copySize; - if (copySize > (size_t)(op-lowPrefix)) /* overlap within current segment */ - { - BYTE* const endOfMatch = op + copySize; - const BYTE* copyFrom = lowPrefix; - while (op < endOfMatch) *op++ = *copyFrom++; - } - else - { - memcpy(op, lowPrefix, copySize); - op += copySize; - } - } - continue; - } - - /* copy repeated sequence */ - cpy = op + length; - if (unlikely((op-match)<8)) - { - const size_t dec64 = dec64table[op-match]; - op[0] = match[0]; - op[1] = match[1]; - op[2] = match[2]; - op[3] = match[3]; - match += dec32table[op-match]; - LZ4_copy4(op+4, match); - op += 8; match -= dec64; - } else { LZ4_copy8(op, match); op+=8; match+=8; } - - if (unlikely(cpy>oend-12)) - { - if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last LASTLITERALS bytes must be literals */ - if (op < oend-8) - { - LZ4_wildCopy(op, match, oend-8); - match += (oend-8) - op; - op = oend-8; - } - while (op<cpy) *op++ = *match++; - } - else - LZ4_wildCopy(op, match, cpy); - op=cpy; /* correction */ - } - - /* end of decoding */ - if (endOnInput) - return (int) (((char*)op)-dest); /* Nb of output bytes decoded */ - else - return (int) (((char*)ip)-source); /* Nb of input bytes read */ - - /* Overflow error detected */ -_output_error: - return (int) (-(((char*)ip)-source))-1; -} - - -int LZ4_decompress_safe(const char* source, char* dest, int compressedSize, int maxDecompressedSize) -{ - return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, full, 0, noDict, (BYTE*)dest, NULL, 0); -} - -int LZ4_decompress_safe_partial(const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize) -{ - return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, partial, targetOutputSize, noDict, (BYTE*)dest, NULL, 0); -} - -int LZ4_decompress_fast(const char* source, char* dest, int originalSize) -{ - return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)(dest - 64 KB), NULL, 64 KB); -} - - -/* streaming decompression functions */ - -typedef struct -{ - BYTE* externalDict; - size_t extDictSize; - BYTE* prefixEnd; - size_t prefixSize; -} LZ4_streamDecode_t_internal; - -/* - * If you prefer dynamic allocation methods, - * LZ4_createStreamDecode() - * provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure. - */ -LZ4_streamDecode_t* LZ4_createStreamDecode(void) -{ - LZ4_streamDecode_t* lz4s = (LZ4_streamDecode_t*) ALLOCATOR(sizeof(U64), LZ4_STREAMDECODESIZE_U64); - return lz4s; -} - -int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream) -{ - FREEMEM(LZ4_stream); - return 0; -} - -/* - * LZ4_setStreamDecode - * Use this function to instruct where to find the dictionary - * This function is not necessary if previous data is still available where it was decoded. - * Loading a size of 0 is allowed (same effect as no dictionary). - * Return : 1 if OK, 0 if error - */ -int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize) -{ - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; - lz4sd->prefixSize = (size_t) dictSize; - lz4sd->prefixEnd = (BYTE*) dictionary + dictSize; - lz4sd->externalDict = NULL; - lz4sd->extDictSize = 0; - return 1; -} - -/* -*_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_setStreamDecode() -*/ -int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize) -{ - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; - int result; - - if (lz4sd->prefixEnd == (BYTE*)dest) - { - result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, - endOnInputSize, full, 0, - usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); - if (result <= 0) return result; - lz4sd->prefixSize += result; - lz4sd->prefixEnd += result; - } - else - { - lz4sd->extDictSize = lz4sd->prefixSize; - lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize; - result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, - endOnInputSize, full, 0, - usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize); - if (result <= 0) return result; - lz4sd->prefixSize = result; - lz4sd->prefixEnd = (BYTE*)dest + result; - } - - return result; -} - -int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize) -{ - LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode; - int result; - - if (lz4sd->prefixEnd == (BYTE*)dest) - { - result = LZ4_decompress_generic(source, dest, 0, originalSize, - endOnOutputSize, full, 0, - usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize); - if (result <= 0) return result; - lz4sd->prefixSize += originalSize; - lz4sd->prefixEnd += originalSize; - } - else - { - lz4sd->extDictSize = lz4sd->prefixSize; - lz4sd->externalDict = (BYTE*)dest - lz4sd->extDictSize; - result = LZ4_decompress_generic(source, dest, 0, originalSize, - endOnOutputSize, full, 0, - usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize); - if (result <= 0) return result; - lz4sd->prefixSize = originalSize; - lz4sd->prefixEnd = (BYTE*)dest + originalSize; - } - - return result; -} - - -/* -Advanced decoding functions : -*_usingDict() : - These decoding functions work the same as "_continue" ones, - the dictionary must be explicitly provided within parameters -*/ - -FORCE_INLINE int LZ4_decompress_usingDict_generic(const char* source, char* dest, int compressedSize, int maxOutputSize, int safe, const char* dictStart, int dictSize) -{ - if (dictSize==0) - return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest, NULL, 0); - if (dictStart+dictSize == dest) - { - if (dictSize >= (int)(64 KB - 1)) - 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); -} - -int LZ4_decompress_safe_usingDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize) -{ - return LZ4_decompress_usingDict_generic(source, dest, compressedSize, maxOutputSize, 1, dictStart, dictSize); -} - -int LZ4_decompress_fast_usingDict(const char* source, char* dest, int originalSize, const char* dictStart, int dictSize) -{ - return LZ4_decompress_usingDict_generic(source, dest, 0, originalSize, 0, dictStart, dictSize); -} - -/* 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); -} - - -/*************************************************** - Obsolete 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 totally equivalent to LZ4_decompress_fast -- LZ4_uncompress_unknownOutputSize is totally equivalent to LZ4_decompress_safe -*/ -int LZ4_uncompress (const char* source, char* dest, int outputSize) { return LZ4_decompress_fast(source, dest, outputSize); } -int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize) { return LZ4_decompress_safe(source, dest, isize, maxOutputSize); } - - -/* Obsolete Streaming functions */ - -int LZ4_sizeofStreamState() { return LZ4_STREAMSIZE; } - -static void LZ4_init(LZ4_stream_t_internal* lz4ds, const BYTE* base) -{ - MEM_INIT(lz4ds, 0, LZ4_STREAMSIZE); - lz4ds->bufferStart = base; -} - -int LZ4_resetStreamState(void* state, const 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); - return 0; -} - -void* LZ4_create (const char* inputBuffer) -{ - void* lz4ds = ALLOCATOR(8, LZ4_STREAMSIZE_U64); - LZ4_init ((LZ4_stream_t_internal*)lz4ds, (const BYTE*)inputBuffer); - return lz4ds; -} - -char* LZ4_slideInputBuffer (void* LZ4_Data) -{ - LZ4_stream_t_internal* lz4ds = (LZ4_stream_t_internal*)LZ4_Data; - - LZ4_saveDict((LZ4_stream_t*)LZ4_Data, (char*)lz4ds->bufferStart, 64 KB); - - return (char*)(lz4ds->bufferStart + 64 KB); -} - -/* 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 < (int)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 < (int)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) -{ - return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB); -} - -int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int originalSize) -{ - return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB); -} - -#endif /* LZ4_COMMONDEFS_ONLY */ - |