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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
#ifndef TREES_H_
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#define TREES_H_
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/* Constants */
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#define DIST_CODE_LEN 512
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/* see definition of array dist_code in trees.c */
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#define MAX_BL_BITS 7
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/* Bit length codes must not exceed MAX_BL_BITS bits */
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#define REP_3_6 16
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/* repeat previous bit length 3-6 times (2 bits of repeat count) */
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#define REPZ_3_10 17
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/* repeat a zero length 3-10 times (3 bits of repeat count) */
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#define REPZ_11_138 18
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/* repeat a zero length 11-138 times (7 bits of repeat count) */
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static const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
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= {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
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static const int extra_dbits[D_CODES] /* extra bits for each distance code */
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= {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
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static const int extra_blbits[BL_CODES] /* extra bits for each bit length code */
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= {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
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static const unsigned char bl_order[BL_CODES]
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= {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
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/* The lengths of the bit length codes are sent in order of decreasing
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* probability, to avoid transmitting the lengths for unused bit length codes.
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*/
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/* Function definitions */
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void gen_codes (ct_data *tree, int max_code, uint16_t *bl_count);
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#endif
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