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-rw-r--r--LzFind.h74
1 files changed, 74 insertions, 0 deletions
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+/* LzFind.h -- Match finder for LZ algorithms
+2009-04-22 : Igor Pavlov : Public domain */
+
+typedef uint32_t CLzRef;
+
+typedef struct
+{
+ uint8_t *bufferBase;
+ uint8_t *buffer;
+ CLzRef *hash;
+ CLzRef *son;
+ uint32_t pos;
+ uint32_t posLimit;
+ uint32_t streamPos;
+ uint32_t lenLimit;
+
+ uint32_t cyclicBufferPos;
+ uint32_t cyclicBufferSize; /* it must be = (historySize + 1) */
+
+ uint32_t matchMaxLen;
+ uint32_t hashMask;
+ uint32_t cutValue;
+
+ uint32_t blockSize;
+ uint32_t keepSizeBefore;
+ uint32_t keepSizeAfter;
+
+ uint32_t numHashBytes;
+ uint32_t historySize;
+ uint32_t hashSizeSum;
+ uint32_t numSons;
+ int infd;
+ int result;
+ uint32_t crc;
+ bool btMode;
+ bool streamEndWasReached;
+} CMatchFinder;
+
+
+/* Conditions:
+ historySize <= 3 GB
+ keepAddBufferBefore + matchMaxLen + keepAddBufferAfter < 511MB
+*/
+int Mf_Init(CMatchFinder *p, const int ifd, const int mc, uint32_t historySize,
+ uint32_t keepAddBufferBefore, uint32_t matchMaxLen, uint32_t keepAddBufferAfter);
+
+void Mf_Free(CMatchFinder *p);
+
+
+/*
+Conditions:
+ Mf_GetNumAvailableBytes_Func must be called before each Mf_GetMatchLen_Func.
+ Mf_GetPointerToCurrentPos_Func's result must be used only before any other function
+*/
+
+typedef uint32_t (*Mf_GetMatches_Func)(void *object, uint32_t *distances);
+typedef void (*Mf_Skip_Func)(void *object, uint32_t);
+
+typedef struct _IMatchFinder
+{
+ Mf_GetMatches_Func GetMatches;
+ Mf_Skip_Func Skip;
+} IMatchFinder;
+
+void Mf_CreateVTable(CMatchFinder *p, IMatchFinder *vTable);
+
+static inline uint32_t Mf_GetNumAvailableBytes(CMatchFinder *p)
+ { return p->streamPos - p->pos; }
+
+static inline uint8_t Mf_GetIndexByte(CMatchFinder *p, int index)
+ { return p->buffer[index]; }
+
+static inline uint8_t * Mf_GetPointerToCurrentPos(CMatchFinder *p)
+ { return p->buffer; }