Source code of Windows XP (NT5)
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/*
* common/compdefs.h * * Definitions for both encoder and decoder */
/*
* Smallest allowable match length */#define MIN_MATCH 2
/*
* Maximum match length */#define MAX_MATCH (MIN_MATCH+255)
/*
* Number of uncompressed symbols */#define NUM_CHARS 256
/*
* Number of match lengths which are correlated with match positions */#define NUM_PRIMARY_LENGTHS 7
/*
* Primary lengths plus the extension code */#define NUM_LENGTHS (NUM_PRIMARY_LENGTHS+1)
/*
* Equals number of different possible match lengths minus primary lengths */#define NUM_SECONDARY_LENGTHS ((MAX_MATCH-MIN_MATCH+1)-NUM_PRIMARY_LENGTHS)
/* NL_SHIFT = log2(NUM_LENGTHS) */#define NL_SHIFT 3
/*
* Number of repeated offsets */#define NUM_REPEATED_OFFSETS 3
/*
* Number of elements in the aligned offset tree */#define ALIGNED_NUM_ELEMENTS 8
/*
* Repeat codes for outputting trees */
/* Minimum number of repetitions of anything we're interested in */#define TREE_ENC_REP_MIN 4
/* Maximum repetitions for "type A" repetition of zeroes *//* (min...min+REP_ZERO_FIRST) */#define TREE_ENC_REP_ZERO_FIRST 16
/* Maximum repetitions for "type B" repetition of zeroes *//* (min+REP_ZERO_FIRST...min+REP_ZERO_FIRST+REP_ZERO_SECOND) */#define TREE_ENC_REP_ZERO_SECOND 32
/* Maximum repetitions for "type C" repetition of anything *//* (min...min_REP_SAME_FIRST) */#define TREE_ENC_REP_SAME_FIRST 2
/* Bits required to output the above numbers */#define TREE_ENC_REPZ_FIRST_EXTRA_BITS 4
#define TREE_ENC_REPZ_SECOND_EXTRA_BITS 5
#define TREE_ENC_REP_SAME_EXTRA_BITS 1
/* Number of cfdata frames before E8's are turned off automatically */#define E8_CFDATA_FRAME_THRESHOLD 32768
/*
* Block types */typedef enum{ BLOCKTYPE_INVALID = 0, BLOCKTYPE_VERBATIM = 1, /* normal block */ BLOCKTYPE_ALIGNED = 2, /* aligned offset block */ BLOCKTYPE_UNCOMPRESSED = 3 /* uncompressed block */} lzx_block_type;
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