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