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63 lines
2.1 KiB
63 lines
2.1 KiB
/*
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** lzcommon.h - Shared information for LZ modules.
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**
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** Author: DavidDi
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*/
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// Constants
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/////////////
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#define RING_BUF_LEN 4096 // size of ring buffer
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#define MAX_RING_BUF_LEN 4224 // size of ring buffer - from LZFile
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// struct declaration in lzexpand.h
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#define NIL RING_BUF_LEN // flag index used in binary search
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// trees
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#define BUF_CLEAR_BYTE ((BYTE) ' ') // rgbyteRingBuf[] initializer
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#define MAX_LITERAL_LEN 2 // encode string into position and
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// length if match length greater than
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// this value (== # of bytes required
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// to encode position and length)
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#define FIRST_MAX_MATCH_LEN 0x10 // ALG_FIRST used this length
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#define LZ_MAX_MATCH_LEN (0x10 + MAX_LITERAL_LEN)
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#define LZA_MAX_MATCH_LEN 64
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// upper limit for match length
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// (n.b., assume length field implies
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// length += 3)
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// Maximum number of bytes LZDecode() and LZADecode() will expand beyond
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// position requested.
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#define MAX_OVERRUN ((long)pLZI->cbMaxMatchLen)
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// Globals
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///////////
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extern INT iCurMatch, // index of longest match (set by LZInsertNode())
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cbCurMatch; // length of longest match (set by LZInsertNode())
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extern DWORD uFlags; // LZ decoding description byte
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extern INT iCurRingBufPos; // ring buffer offset
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// Prototypes
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//////////////
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// lzcommon.c
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extern BOOL LZInitTree(PLZINFO pLZI);
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extern VOID LZFreeTree(PLZINFO pLZI);
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extern VOID LZInsertNode(INT nodeToInsert, BOOL bDoArithmeticInsert, PLZINFO pLZI);
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extern VOID LZDeleteNode(INT nodeToDelete, PLZINFO pLZI);
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// lzcomp.c
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extern INT LZEncode(INT doshSource, INT doshDest, PLZINFO pLZI);
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// lzexp.c
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extern INT LZDecode(INT doshSource, INT doshDest, LONG cblExpandedLength,
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BOOL bRestartDecoding, BOOL bFirstAlg, PLZINFO pLZI);
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