diff options
Diffstat (limited to 'lib/lz4.c')
-rw-r--r-- | lib/lz4.c | 84 |
1 files changed, 40 insertions, 44 deletions
@@ -151,14 +151,15 @@ typedef size_t uptrval; /* generally true, except OpenVMS-64 */ #endif +#if defined(__x86_64__) + typedef U64 reg_t; /* 64-bits in x32 mode */ +#else + typedef size_t reg_t; /* 32-bits in x32 mode */ +#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 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */ @@ -171,7 +172,7 @@ static unsigned LZ4_isLittleEndian(void) static U16 LZ4_read16(const void* memPtr) { return *(const U16*) memPtr; } static U32 LZ4_read32(const void* memPtr) { return *(const U32*) memPtr; } -static size_t LZ4_read_ARCH(const void* memPtr) { return *(const size_t*) memPtr; } +static reg_t LZ4_read_ARCH(const void* memPtr) { return *(const reg_t*) memPtr; } static void LZ4_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; } static void LZ4_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } @@ -180,11 +181,11 @@ static void LZ4_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; } /* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */ /* currently only defined for gcc and icc */ -typedef union { U16 u16; U32 u32; size_t uArch; } __attribute__((packed)) unalign; +typedef union { U16 u16; U32 u32; reg_t uArch; } __attribute__((packed)) unalign; static U16 LZ4_read16(const void* ptr) { return ((const unalign*)ptr)->u16; } static U32 LZ4_read32(const void* ptr) { return ((const unalign*)ptr)->u32; } -static size_t LZ4_read_ARCH(const void* ptr) { return ((const unalign*)ptr)->uArch; } +static reg_t LZ4_read_ARCH(const void* ptr) { return ((const unalign*)ptr)->uArch; } static void LZ4_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; } static void LZ4_write32(void* memPtr, U32 value) { ((unalign*)memPtr)->u32 = value; } @@ -201,9 +202,9 @@ static U32 LZ4_read32(const void* memPtr) U32 val; memcpy(&val, memPtr, sizeof(val)); return val; } -static size_t LZ4_read_ARCH(const void* memPtr) +static reg_t LZ4_read_ARCH(const void* memPtr) { - size_t val; memcpy(&val, memPtr, sizeof(val)); return val; + reg_t val; memcpy(&val, memPtr, sizeof(val)); return val; } static void LZ4_write16(void* memPtr, U16 value) @@ -252,12 +253,6 @@ static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd) const BYTE* s = (const BYTE*)srcPtr; BYTE* const e = (BYTE*)dstEnd; -#if 0 - const size_t l2 = 8 - (((size_t)d) & (sizeof(void*)-1)); - LZ4_copy8(d,s); if (d>e-9) return; - d+=l2; s+=l2; -#endif /* join to align */ - do { LZ4_copy8(d,s); d+=8; s+=8; } while (d<e); } @@ -294,10 +289,10 @@ static const int LZ4_minLength = (MFLIMIT+1); /*-************************************ * Common functions **************************************/ -static unsigned LZ4_NbCommonBytes (register size_t val) +static unsigned LZ4_NbCommonBytes (register reg_t val) { if (LZ4_isLittleEndian()) { - if (LZ4_64bits()) { + if (sizeof(val)==8) { # if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) unsigned long r = 0; _BitScanForward64( &r, (U64)val ); @@ -321,7 +316,7 @@ static unsigned LZ4_NbCommonBytes (register size_t val) # endif } } else /* Big Endian CPU */ { - if (LZ4_64bits()) { + if (sizeof(val)==8) { # if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT) unsigned long r = 0; _BitScanReverse64( &r, val ); @@ -352,18 +347,19 @@ static unsigned LZ4_NbCommonBytes (register size_t val) } } +#define STEPSIZE sizeof(reg_t) 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 const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn); + reg_t const 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 ((STEPSIZE==8) && (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); @@ -421,9 +417,9 @@ static U32 LZ4_hash5(U64 sequence, tableType_t const tableType) return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog)); } -FORCE_INLINE U32 LZ4_hashPosition(const void* p, tableType_t const tableType) +FORCE_INLINE U32 LZ4_hashPosition(const void* const p, tableType_t const tableType) { - if ((LZ4_64bits()) && (tableType == byU32)) return LZ4_hash5(LZ4_read_ARCH(p), tableType); + if ((sizeof(reg_t)==8) && (tableType != byU16)) return LZ4_hash5(LZ4_read_ARCH(p), tableType); return LZ4_hash4(LZ4_read32(p), tableType); } @@ -460,7 +456,7 @@ FORCE_INLINE const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableTy /** LZ4_compress_generic() : inlined, to ensure branches are decided at compilation time */ FORCE_INLINE int LZ4_compress_generic( - LZ4_stream_t_internal* const dictPtr, + LZ4_stream_t_internal* const cctx, const char* const source, char* const dest, const int inputSize, @@ -474,10 +470,10 @@ FORCE_INLINE int LZ4_compress_generic( 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* const lowRefLimit = ip - cctx->dictSize; + const BYTE* const dictionary = cctx->dictionary; + const BYTE* const dictEnd = dictionary + cctx->dictSize; + const ptrdiff_t dictDelta = dictEnd - (const BYTE*)source; const BYTE* anchor = (const BYTE*) source; const BYTE* const iend = ip + inputSize; const BYTE* const mflimit = iend - MFLIMIT; @@ -487,7 +483,6 @@ FORCE_INLINE int LZ4_compress_generic( BYTE* const olimit = op + maxOutputSize; U32 forwardH; - size_t refDelta=0; /* Init conditions */ if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported inputSize, too large (or negative) */ @@ -499,11 +494,11 @@ FORCE_INLINE int LZ4_compress_generic( lowLimit = (const BYTE*)source; break; case withPrefix64k: - base = (const BYTE*)source - dictPtr->currentOffset; - lowLimit = (const BYTE*)source - dictPtr->dictSize; + base = (const BYTE*)source - cctx->currentOffset; + lowLimit = (const BYTE*)source - cctx->dictSize; break; case usingExtDict: - base = (const BYTE*)source - dictPtr->currentOffset; + base = (const BYTE*)source - cctx->currentOffset; lowLimit = (const BYTE*)source; break; } @@ -511,11 +506,12 @@ FORCE_INLINE int LZ4_compress_generic( if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */ /* First Byte */ - LZ4_putPosition(ip, dictPtr->hashTable, tableType, base); + LZ4_putPosition(ip, cctx->hashTable, tableType, base); ip++; forwardH = LZ4_hashPosition(ip, tableType); /* Main Loop */ for ( ; ; ) { + ptrdiff_t refDelta = 0; const BYTE* match; BYTE* token; @@ -531,7 +527,7 @@ FORCE_INLINE int LZ4_compress_generic( if (unlikely(forwardIp > mflimit)) goto _last_literals; - match = LZ4_getPositionOnHash(h, dictPtr->hashTable, tableType, base); + match = LZ4_getPositionOnHash(h, cctx->hashTable, tableType, base); if (dict==usingExtDict) { if (match < (const BYTE*)source) { refDelta = dictDelta; @@ -541,7 +537,7 @@ FORCE_INLINE int LZ4_compress_generic( lowLimit = (const BYTE*)source; } } forwardH = LZ4_hashPosition(forwardIp, tableType); - LZ4_putPositionOnHash(ip, h, dictPtr->hashTable, tableType, base); + LZ4_putPositionOnHash(ip, h, cctx->hashTable, tableType, base); } while ( ((dictIssue==dictSmall) ? (match < lowRefLimit) : 0) || ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip)) @@ -614,10 +610,10 @@ _next_match: if (ip > mflimit) break; /* Fill table */ - LZ4_putPosition(ip-2, dictPtr->hashTable, tableType, base); + LZ4_putPosition(ip-2, cctx->hashTable, tableType, base); /* Test next position */ - match = LZ4_getPosition(ip, dictPtr->hashTable, tableType, base); + match = LZ4_getPosition(ip, cctx->hashTable, tableType, base); if (dict==usingExtDict) { if (match < (const BYTE*)source) { refDelta = dictDelta; @@ -626,7 +622,7 @@ _next_match: refDelta = 0; lowLimit = (const BYTE*)source; } } - LZ4_putPosition(ip, dictPtr->hashTable, tableType, base); + LZ4_putPosition(ip, cctx->hashTable, tableType, base); if ( ((dictIssue==dictSmall) ? (match>=lowRefLimit) : 1) && (match+MAX_DISTANCE>=ip) && (LZ4_read32(match+refDelta)==LZ4_read32(ip)) ) @@ -669,12 +665,12 @@ int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int if (inputSize < LZ4_64Klimit) return LZ4_compress_generic(ctx, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(ctx, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(ctx, source, dest, inputSize, 0, notLimited, (sizeof(void*)==8) ? byU32 : byPtr, noDict, noDictIssue, acceleration); } else { if (inputSize < LZ4_64Klimit) return LZ4_compress_generic(ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(ctx, source, dest, inputSize, maxOutputSize, limitedOutput, (sizeof(void*)==8) ? byU32 : byPtr, noDict, noDictIssue, acceleration); } } @@ -713,7 +709,7 @@ int LZ4_compress_fast_force(const char* source, char* dest, int inputSize, int m if (inputSize < LZ4_64Klimit) return LZ4_compress_generic(&ctx.internal_donotuse, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration); else - return LZ4_compress_generic(&ctx.internal_donotuse, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration); + return LZ4_compress_generic(&ctx.internal_donotuse, source, dest, inputSize, maxOutputSize, limitedOutput, sizeof(void*)==8 ? byU32 : byPtr, noDict, noDictIssue, acceleration); } @@ -887,7 +883,7 @@ static int LZ4_compress_destSize_extState (LZ4_stream_t* state, const char* src, if (*srcSizePtr < LZ4_64Klimit) return LZ4_compress_destSize_generic(&state->internal_donotuse, src, dst, srcSizePtr, targetDstSize, byU16); else - return LZ4_compress_destSize_generic(&state->internal_donotuse, src, dst, srcSizePtr, targetDstSize, LZ4_64bits() ? byU32 : byPtr); + return LZ4_compress_destSize_generic(&state->internal_donotuse, src, dst, srcSizePtr, targetDstSize, sizeof(void*)==8 ? byU32 : byPtr); } } @@ -935,7 +931,7 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_stream) } -#define HASH_UNIT sizeof(size_t) +#define HASH_UNIT sizeof(reg_t) int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize) { LZ4_stream_t_internal* dict = &LZ4_dict->internal_donotuse; @@ -971,7 +967,7 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int 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 */ + ((uptrval)LZ4_dict->currentOffset > (uptrval)src)) { /* address space overflow */ /* rescale hash table */ U32 const delta = LZ4_dict->currentOffset - 64 KB; const BYTE* dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize; @@ -1432,7 +1428,7 @@ static void LZ4_init(LZ4_stream_t* lz4ds, BYTE* base) int LZ4_resetStreamState(void* state, char* inputBuffer) { - if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */ + if ((((uptrval)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */ LZ4_init((LZ4_stream_t*)state, (BYTE*)inputBuffer); return 0; } |