1 files changed, 159 insertions, 0 deletions
diff --git a/src/Common/lzma/LzFind.h b/src/Common/lzma/LzFind.h
new file mode 100644
index 00000000..a3f72c98
--- /dev/null
+++ b/src/Common/lzma/LzFind.h
@@ -0,0 +1,159 @@
+/* LzFind.h -- Match finder for LZ algorithms
+2023-03-04 : Igor Pavlov : Public domain */
+
+#ifndef ZIP7_INC_LZ_FIND_H
+#define ZIP7_INC_LZ_FIND_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+typedef UInt32 CLzRef;
+
+typedef struct
+{
+  const Byte *buffer;
+  UInt32 pos;
+  UInt32 posLimit;
+  UInt32 streamPos;  /* wrap over Zero is allowed (streamPos < pos). Use (UInt32)(streamPos - pos) */
+  UInt32 lenLimit;
+
+  UInt32 cyclicBufferPos;
+  UInt32 cyclicBufferSize; /* it must be = (historySize + 1) */
+
+  Byte streamEndWasReached;
+  Byte btMode;
+  Byte bigHash;
+  Byte directInput;
+
+  UInt32 matchMaxLen;
+  CLzRef *hash;
+  CLzRef *son;
+  UInt32 hashMask;
+  UInt32 cutValue;
+
+  Byte *bufBase;
+  ISeqInStreamPtr stream;
+  
+  UInt32 blockSize;
+  UInt32 keepSizeBefore;
+  UInt32 keepSizeAfter;
+
+  UInt32 numHashBytes;
+  size_t directInputRem;
+  UInt32 historySize;
+  UInt32 fixedHashSize;
+  Byte numHashBytes_Min;
+  Byte numHashOutBits;
+  Byte _pad2_[2];
+  SRes result;
+  UInt32 crc[256];
+  size_t numRefs;
+
+  UInt64 expectedDataSize;
+} CMatchFinder;
+
+#define Inline_MatchFinder_GetPointerToCurrentPos(p) ((const Byte *)(p)->buffer)
+
+#define Inline_MatchFinder_GetNumAvailableBytes(p) ((UInt32)((p)->streamPos - (p)->pos))
+
+/*
+#define Inline_MatchFinder_IsFinishedOK(p) \
+    ((p)->streamEndWasReached \
+        && (p)->streamPos == (p)->pos \
+        && (!(p)->directInput || (p)->directInputRem == 0))
+*/
+      
+int MatchFinder_NeedMove(CMatchFinder *p);
+/* Byte *MatchFinder_GetPointerToCurrentPos(CMatchFinder *p); */
+void MatchFinder_MoveBlock(CMatchFinder *p);
+void MatchFinder_ReadIfRequired(CMatchFinder *p);
+
+void MatchFinder_Construct(CMatchFinder *p);
+
+/* (directInput = 0) is default value.
+   It's required to provide correct (directInput) value
+   before calling MatchFinder_Create().
+   You can set (directInput) by any of the following calls:
+     - MatchFinder_SET_DIRECT_INPUT_BUF()
+     - MatchFinder_SET_STREAM()
+     - MatchFinder_SET_STREAM_MODE()
+*/
+
+#define MatchFinder_SET_DIRECT_INPUT_BUF(p, _src_, _srcLen_) { \
+  (p)->stream = NULL; \
+  (p)->directInput = 1; \
+  (p)->buffer = (_src_); \
+  (p)->directInputRem = (_srcLen_); }
+
+/*
+#define MatchFinder_SET_STREAM_MODE(p) { \
+  (p)->directInput = 0; }
+*/
+
+#define MatchFinder_SET_STREAM(p, _stream_) { \
+  (p)->stream = _stream_; \
+  (p)->directInput = 0; }
+  
+
+int MatchFinder_Create(CMatchFinder *p, UInt32 historySize,
+    UInt32 keepAddBufferBefore, UInt32 matchMaxLen, UInt32 keepAddBufferAfter,
+    ISzAllocPtr alloc);
+void MatchFinder_Free(CMatchFinder *p, ISzAllocPtr alloc);
+void MatchFinder_Normalize3(UInt32 subValue, CLzRef *items, size_t numItems);
+
+/*
+#define MatchFinder_INIT_POS(p, val) \
+    (p)->pos = (val); \
+    (p)->streamPos = (val);
+*/
+
+// void MatchFinder_ReduceOffsets(CMatchFinder *p, UInt32 subValue);
+#define MatchFinder_REDUCE_OFFSETS(p, subValue) \
+    (p)->pos -= (subValue); \
+    (p)->streamPos -= (subValue);
+
+
+UInt32 * GetMatchesSpec1(UInt32 lenLimit, UInt32 curMatch, UInt32 pos, const Byte *buffer, CLzRef *son,
+    size_t _cyclicBufferPos, UInt32 _cyclicBufferSize, UInt32 _cutValue,
+    UInt32 *distances, UInt32 maxLen);
+
+/*
+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 void (*Mf_Init_Func)(void *object);
+typedef UInt32 (*Mf_GetNumAvailableBytes_Func)(void *object);
+typedef const Byte * (*Mf_GetPointerToCurrentPos_Func)(void *object);
+typedef UInt32 * (*Mf_GetMatches_Func)(void *object, UInt32 *distances);
+typedef void (*Mf_Skip_Func)(void *object, UInt32);
+
+typedef struct
+{
+  Mf_Init_Func Init;
+  Mf_GetNumAvailableBytes_Func GetNumAvailableBytes;
+  Mf_GetPointerToCurrentPos_Func GetPointerToCurrentPos;
+  Mf_GetMatches_Func GetMatches;
+  Mf_Skip_Func Skip;
+} IMatchFinder2;
+
+void MatchFinder_CreateVTable(CMatchFinder *p, IMatchFinder2 *vTable);
+
+void MatchFinder_Init_LowHash(CMatchFinder *p);
+void MatchFinder_Init_HighHash(CMatchFinder *p);
+void MatchFinder_Init_4(CMatchFinder *p);
+void MatchFinder_Init(CMatchFinder *p);
+
+UInt32* Bt3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
+UInt32* Hc3Zip_MatchFinder_GetMatches(CMatchFinder *p, UInt32 *distances);
+
+void Bt3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
+void Hc3Zip_MatchFinder_Skip(CMatchFinder *p, UInt32 num);
+
+void LzFindPrepare(void);
+
+EXTERN_C_END
+
+#endif