X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.fastlz%2Fnative%2Flz4hc.c;fp=bundles%2Forg.simantics.fastlz%2Fnative%2Flz4hc.c;h=cca755c26c74cc2f54afcbe9bcce0cbe8b613c82;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.fastlz/native/lz4hc.c b/bundles/org.simantics.fastlz/native/lz4hc.c
new file mode 100644
index 000000000..cca755c26
--- /dev/null
+++ b/bundles/org.simantics.fastlz/native/lz4hc.c
@@ -0,0 +1,663 @@
+/*
+   LZ4 HC - High Compression Mode of LZ4
+   Copyright (C) 2011-2012, Yann Collet.
+   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are
+   met:
+
+       * Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+       * Redistributions in binary form must reproduce the above
+   copyright notice, this list of conditions and the following disclaimer
+   in the documentation and/or other materials provided with the
+   distribution.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+   You can contact the author at :
+   - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
+   - LZ4 source repository : http://code.google.com/p/lz4/
+*/
+
+
+//**************************************
+// 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
+#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__))) )
+#define LZ4_BIG_ENDIAN 1
+#else
+// 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
+#if defined(__ARM_FEATURE_UNALIGNED)
+#define LZ4_FORCE_UNALIGNED_ACCESS 1
+#endif
+
+
+//**************************************
+// Compiler Options
+//**************************************
+#if __STDC_VERSION__ >= 199901L    // C99
+  /* "restrict" is a known keyword */
+#else
+#define restrict  // Disable restrict
+#endif
+
+#ifdef _MSC_VER
+#define inline __forceinline    // Visual is not C99, but supports some kind of inline
+#endif
+
+#ifdef _MSC_VER  // Visual Studio
+#define bswap16(x) _byteswap_ushort(x)
+#else
+#define bswap16(x)  ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
+#endif
+
+
+//**************************************
+// Includes
+//**************************************
+#include <stdlib.h>   // calloc, free
+#include <string.h>   // memset, memcpy
+#include "lz4hc.h"
+
+#define ALLOCATOR(s) calloc(1,s)
+#define FREEMEM free
+#define MEM_INIT memset
+
+
+//**************************************
+// 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
+#include <stdint.h>
+#define BYTE	uint8_t
+#define U16		uint16_t
+#define U32		uint32_t
+#define S32		int32_t
+#define U64		uint64_t
+#endif
+
+#ifndef LZ4_FORCE_UNALIGNED_ACCESS
+#pragma pack(push, 1) 
+#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;
+
+#ifndef LZ4_FORCE_UNALIGNED_ACCESS
+#pragma pack(pop) 
+#endif
+
+#define A64(x) (((U64_S *)(x))->v)
+#define A32(x) (((U32_S *)(x))->v)
+#define A16(x) (((U16_S *)(x))->v)
+
+
+//**************************************
+// Constants
+//**************************************
+#define MINMATCH 4
+
+#define DICTIONARY_LOGSIZE 16
+#define MAXD (1<<DICTIONARY_LOGSIZE)
+#define MAXD_MASK ((U32)(MAXD - 1))
+#define MAX_DISTANCE (MAXD - 1)
+
+#define HASH_LOG (DICTIONARY_LOGSIZE-1)
+#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)
+#define RUN_MASK ((1U<<RUN_BITS)-1)
+
+#define COPYLENGTH 8
+#define LASTLITERALS 5
+#define MFLIMIT (COPYLENGTH+MINMATCH)
+#define MINLENGTH (MFLIMIT+1)
+#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
+
+
+//**************************************
+// 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
+#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
+#endif
+
+#if defined(LZ4_BIG_ENDIAN)
+#define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = bswap16(v); d = (s) - v; }
+#define LZ4_WRITE_LITTLEENDIAN_16(p,i)  { U16 v = (U16)(i); v = bswap16(v); A16(p) = v; p+=2; }
+#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
+//************************************************************
+typedef struct 
+{
+	const BYTE* base;
+	HTYPE hashTable[HASHTABLESIZE];
+	U16 chainTable[MAXD];
+	const BYTE* nextToUpdate;
+} LZ4HC_Data_Structure;
+
+
+//**************************************
+// 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_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
+//**************************************
+#if LZ4_ARCH64
+
+inline static int LZ4_NbCommonBytes (register U64 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+    #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanReverse64( &r, val );
+    return (int)(r>>3);
+    #elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_clzll(val) >> 3); 
+    #else
+	int 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
+    #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanForward64( &r, val );
+    return (int)(r>>3);
+    #elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_ctzll(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 & -val) * 0x0218A392CDABBD3F)) >> 58];
+    #endif
+#endif
+}
+
+#else
+
+inline static int LZ4_NbCommonBytes (register U32 val)
+{
+#if defined(LZ4_BIG_ENDIAN)
+    #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanReverse( &r, val );
+    return (int)(r>>3);
+    #elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_clz(val) >> 3); 
+    #else
+	int r;
+	if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+	r += (!val);
+	return r;
+    #endif
+#else
+    #if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    unsigned long r = 0;
+    _BitScanForward( &r, val );
+    return (int)(r>>3);
+    #elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
+    return (__builtin_ctz(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
+#endif
+}
+
+#endif
+
+
+inline static int LZ4HC_Init (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->base = base;
+	return 1;
+}
+
+
+inline static void* LZ4HC_Create (const BYTE* base)
+{
+	void* hc4 = ALLOCATOR(sizeof(LZ4HC_Data_Structure));
+
+	LZ4HC_Init (hc4, base);
+	return hc4;
+}
+
+
+inline static int LZ4HC_Free (void** LZ4HC_Data)
+{
+	FREEMEM(*LZ4HC_Data);
+	*LZ4HC_Data = NULL;
+	return (1);
+}
+
+
+inline static void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
+{
+	U16*   chainTable = hc4->chainTable;
+	HTYPE* HashTable  = hc4->hashTable;
+	INITBASE(base,hc4->base);
+
+	while(hc4->nextToUpdate < ip)
+	{
+		ADD_HASH(hc4->nextToUpdate);
+		hc4->nextToUpdate++;
+	}
+}
+
+
+inline static int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* const matchlimit, const BYTE** matchpos)
+{
+	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;
+
+	// HC4 match finder
+	LZ4HC_Insert(hc4, ip);
+	ref = HASH_POINTER(ip);
+	while ((ref > (ip-MAX_DISTANCE)) && (nbAttempts))
+	{
+		nbAttempts--;
+		if (*(ref+ml) == *(ip+ml))
+		if (*(U32*)ref == *(U32*)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 = ipt-ip; *matchpos = ref; }
+		}
+		ref = GETNEXT(ref);
+	}
+
+	return 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)
+{
+	U16* const  chainTable = hc4->chainTable;
+	HTYPE* const HashTable = hc4->hashTable;
+	INITBASE(base,hc4->base);
+	const BYTE*  ref;
+	int nbAttempts = MAX_NB_ATTEMPTS;
+	int delta = ip-startLimit;
+
+	// First Match
+	LZ4HC_Insert(hc4, ip);
+	ref = HASH_POINTER(ip);
+
+	while ((ref > ip-MAX_DISTANCE) && (ref >= hc4->base) && (nbAttempts))
+	{
+		nbAttempts--;
+		if (*(startLimit + longest) == *(ref - delta + longest))
+		if (*(U32*)ref == *(U32*)ip)
+		{
+			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);
+				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:
+
+			reft = ref;
+			while ((startt>startLimit) && (reft > hc4->base) && (startt[-1] == reft[-1])) {startt--; reft--;}
+
+			if ((ipt-startt) > longest)
+			{
+				longest = ipt-startt;
+				*matchpos = reft;
+				*startpos = startt;
+			}
+		}
+		ref = GETNEXT(ref);
+	}
+
+	return longest;
+}
+
+
+inline static int LZ4_encodeSequence(const BYTE** ip, BYTE** op, const BYTE** anchor, int ml, const BYTE* ref)
+{
+	int length, len; 
+	BYTE* token;
+
+	// Encode Literal length
+	length = *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);
+
+	// Copy Literals
+	LZ4_BLINDCOPY(*anchor, *op, length);
+
+	// Encode Offset
+	LZ4_WRITE_LITTLEENDIAN_16(*op,*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;	
+
+	// Prepare next loop
+	*ip += ml;
+	*anchor = *ip; 
+
+	return 0;
+}
+
+
+//****************************
+// Compression CODE
+//****************************
+
+int LZ4_compressHCCtx(LZ4HC_Data_Structure* ctx,
+				 const char* source, 
+				 char* dest,
+				 int isize)
+{	
+	const BYTE* ip = (const BYTE*) source;
+	const BYTE* anchor = ip;
+	const BYTE* const iend = ip + isize;
+	const BYTE* const mflimit = iend - MFLIMIT;
+	const BYTE* const matchlimit = (iend - LASTLITERALS);
+
+	BYTE* op = (BYTE*) dest;
+
+	int	ml, ml2, ml3, ml0;
+	const BYTE* ref=NULL;
+	const BYTE* start2=NULL;
+	const BYTE* ref2=NULL;
+	const BYTE* start3=NULL;
+	const BYTE* ref3=NULL;
+	const BYTE* start0;
+	const BYTE* ref0;
+
+	ip++;
+
+	// Main Loop
+	while (ip < mflimit)
+	{
+		ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref));
+		if (!ml) { ip++; continue; }
+
+		// 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);
+		else ml2=ml;
+
+		if (ml2 == ml)  // No better match
+		{
+			LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
+			continue;
+		}
+
+		if (start0 < ip)
+		{
+			if (start2 < ip + ml0)   // empirical
+			{
+				ip = start0;
+				ref = ref0;
+				ml = ml0;
+			}
+		}
+
+		// Here, start0==ip
+		if ((start2 - ip) < 3)   // First Match too small : removed
+		{
+			ml = ml2;
+			ip = start2;
+			ref =ref2;
+			goto _Search2;
+		}
+
+_Search3:
+		// Currently we have :
+		// ml2 > ml1, and
+		// ip1+3 <= ip2 (usually < ip1+ml1)
+		if ((start2 - ip) < OPTIMAL_ML)
+		{
+			int correction;
+			int new_ml = ml;
+			if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML;
+			if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = start2 - ip + ml2 - MINMATCH;
+			correction = new_ml - (start2 - ip);
+			if (correction > 0)
+			{
+				start2 += correction;
+				ref2 += correction;
+				ml2 -= correction;
+			}
+		}
+		// 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);
+		else ml3=ml2;
+
+		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 = start2 - ip + ml2 - MINMATCH;
+					correction = ml - (start2 - ip);
+					if (correction > 0)
+					{
+						start2 += correction;
+						ref2 += correction;
+						ml2 -= correction;
+					}
+				}
+				else
+				{
+					ml = start2 - ip;
+				}
+			}
+			// Now, encode 2 sequences
+			LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
+			ip = start2;
+			LZ4_encodeSequence(&ip, &op, &anchor, ml2, ref2);
+			continue;
+		}
+
+		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 (start2 < ip+ml)
+				{
+					int correction = (ip+ml) - start2;
+					start2 += correction;
+					ref2 += correction;
+					ml2 -= correction;
+					if (ml2 < MINMATCH)
+					{
+						start2 = start3;
+						ref2 = ref3;
+						ml2 = ml3;
+					}
+				}
+
+				LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
+				ip  = start3;
+				ref = ref3;
+				ml  = ml3;
+
+				start0 = start2;
+				ref0 = ref2;
+				ml0 = ml2;
+				goto _Search2;
+			}
+
+			start2 = start3;
+			ref2 = ref3;
+			ml2 = ml3;
+			goto _Search3;
+		}
+
+		// 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)
+			{
+				int correction;
+				if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
+				if (ip + ml > start2 + ml2 - MINMATCH) ml = start2 - ip + ml2 - MINMATCH;
+				correction = ml - (start2 - ip);
+				if (correction > 0)
+				{
+					start2 += correction;
+					ref2 += correction;
+					ml2 -= correction;
+				}
+			}
+			else
+			{
+				ml = start2 - ip;
+			}
+		}
+		LZ4_encodeSequence(&ip, &op, &anchor, ml, ref);
+
+		ip = start2;
+		ref = ref2;
+		ml = ml2;
+
+		start2 = start3;
+		ref2 = ref3;
+		ml2 = ml3;
+
+		goto _Search3;
+
+	}
+
+	// Encode Last Literals
+	{
+		int lastRun = iend - anchor;
+		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);
+		memcpy(op, anchor, iend - anchor);
+		op += iend-anchor;
+	} 
+
+	// End
+	return (int) (((char*)op)-dest);
+}
+
+
+int LZ4_compressHC(const char* source, 
+				 char* dest,
+				 int isize)
+{
+	void* ctx = LZ4HC_Create((const BYTE*)source);
+	int result = LZ4_compressHCCtx(ctx, source, dest, isize);
+	LZ4HC_Free (&ctx);
+
+	return result;
+}
+
+