1999/1111/port/thwack.h (diff list | history)

port/thwack.h on 1999/1001
1999/1001		typedef struct Thwack Thwack; typedef struct Unthwack Unthwack; typedef struct ThwBlock ThwBlock; typedef struct UnthwBlock UnthwBlock; enum {
1999/1022		ThwStats = 8,
1999/1001		ThwMaxBlock = 1600, /* max size of compressible block */
1999/1022		HashLog = 12,
1999/1001		HashSize = 1<<HashLog, HashMask = HashSize - 1,
1999/1111		MinMatch = 3, /* shortest match possible */
1999/1001		MaxOff = 8, OffBase = 6,
1999/1022		MinDecode = 8, /* minimum bits to decode a match or lit; >= 8 */
1999/1001		EWinBlocks = 32, /* blocks held in encoder window */ DWinBlocks = 32, /* blocks held in decoder window */
1999/1111		CompBlocks = 10, /* max blocks used to encode data */
1999/1001		MaxSeqMask = 8, /* number of bits in coding block mask */
1999/1022		MaxSeqStart = 256 /* max offset of initial coding block */
1999/1001		}; struct ThwBlock { ulong seq; /* sequence number for this data */ uchar acked; /* ok to use this block; the decoder has it */ ushort begin; /* time of first byte in hash */ uchar *edata; /* last byte of valid data */ ushort maxoff; /* time of last valid hash entry */ ushort *hash; uchar *data; }; struct Thwack {
1999/1007		int slot; /* next block to use */
1999/1001		ThwBlock blocks[EWinBlocks]; ushort hash[EWinBlocks][HashSize]; uchar data[EWinBlocks][ThwMaxBlock]; }; struct UnthwBlock { ulong seq; /* sequence number for this data */ ushort maxoff; /* valid data in each block */ uchar *data; }; struct Unthwack { int slot; /* next block to use */ UnthwBlock blocks[DWinBlocks]; uchar data[DWinBlocks][ThwMaxBlock]; }; void thwackinit(Thwack*); void unthwackinit(Unthwack*);
1999/1022		int thwack(Thwack*, uchar *dst, uchar *src, int nsrc, ulong seq, ulong stats[ThwStats]);
1999/1001		void thwackack(Thwack*, ulong seq, ulong mask); int unthwack(Unthwack*, uchar *dst, int ndst, uchar *src, int nsrc, ulong seq);
1999/1111		int unthwackadd(Unthwack*, uchar *src, int nsrc, ulong seq);