mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
1.3 KiB
40 lines
1.3 KiB
#ifndef TREES_H_ |
|
#define TREES_H_ |
|
|
|
/* Constants */ |
|
|
|
#define DIST_CODE_LEN 512 |
|
/* see definition of array dist_code in trees.c */ |
|
|
|
#define MAX_BL_BITS 7 |
|
/* Bit length codes must not exceed MAX_BL_BITS bits */ |
|
|
|
#define REP_3_6 16 |
|
/* repeat previous bit length 3-6 times (2 bits of repeat count) */ |
|
|
|
#define REPZ_3_10 17 |
|
/* repeat a zero length 3-10 times (3 bits of repeat count) */ |
|
|
|
#define REPZ_11_138 18 |
|
/* repeat a zero length 11-138 times (7 bits of repeat count) */ |
|
|
|
static const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */ |
|
= {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}; |
|
|
|
static const int extra_dbits[D_CODES] /* extra bits for each distance code */ |
|
= {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}; |
|
|
|
static const int extra_blbits[BL_CODES] /* extra bits for each bit length code */ |
|
= {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7}; |
|
|
|
static const unsigned char bl_order[BL_CODES] |
|
= {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15}; |
|
/* The lengths of the bit length codes are sent in order of decreasing |
|
* probability, to avoid transmitting the lengths for unused bit length codes. |
|
*/ |
|
|
|
|
|
/* Function definitions */ |
|
void gen_codes (ct_data *tree, int max_code, uint16_t *bl_count); |
|
|
|
#endif
|
|
|