trees.c File Reference
`#include "deflate.h"`

Go to the source code of this file.

## Classes

struct | static_tree_desc_s

## Macros

#define | MAX_BL_BITS 7
#define | END_BLOCK 256
#define | REP_3_6 16
#define | REPZ_3_10 17
#define | REPZ_11_138 18
#define | DIST_CODE_LEN 512 /* see definition of array dist_code below */
#define | send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
#define | put_short(s, w)
#define | send_bits(s, value, length)
#define | SMALLEST 1
#define | pqremove(s, tree, top)
#define | smaller(tree, n, m, depth)

## Functions

void tr_static_init | OF ((void))
void init_block | OF ((deflate_state *s))
void pqdownheap | OF ((deflate_state *s, ct_data *tree, int k))
void gen_bitlen | OF ((deflate_state *s, tree_desc *desc))
void gen_codes | OF ((ct_data *tree, int max_code, ushf *bl_count))
void scan_tree | OF ((deflate_state *s, ct_data *tree, int max_code))
void send_all_trees | OF ((deflate_state *s, int lcodes, int dcodes, int blcodes))
void compress_block | OF ((deflate_state *s, const ct_data *ltree, const ct_data *dtree))
unsigned bi_reverse | OF ((unsigned value, int length))
void | tr_static_init ()
void ZLIB_INTERNAL | _tr_init (deflate_state *s)
void | init_block (deflate_state *s)
void | pqdownheap (deflate_state *s, ct_data *tree, int k)
void | gen_bitlen (deflate_state *s, tree_desc *desc)
void | gen_codes (ct_data *tree, int max_code, ushf *bl_count)
void | build_tree (deflate_state *s, tree_desc *desc)
void | scan_tree (deflate_state *s, ct_data *tree, int max_code)
void | send_tree (deflate_state *s, ct_data *tree, int max_code)
int | build_bl_tree (deflate_state *s)
void | send_all_trees (deflate_state *s, int lcodes, int dcodes, int blcodes)
void ZLIB_INTERNAL | _tr_stored_block (deflate_state *s, charf *buf, ulg stored_len, int last)
void ZLIB_INTERNAL | _tr_flush_bits (deflate_state *s)
void ZLIB_INTERNAL | _tr_align (deflate_state *s)
void ZLIB_INTERNAL | _tr_flush_block (deflate_state *s, charf *buf, ulg stored_len, int last)
int ZLIB_INTERNAL | _tr_tally (deflate_state *s, unsigned dist, unsigned lc)
void | compress_block (deflate_state *s, const ct_data *ltree, const ct_data *dtree)
int | detect_data_type (deflate_state *s)
unsigned | bi_reverse (unsigned code, int len)
void | bi_flush (deflate_state *s)
void | bi_windup (deflate_state *s)

## Variables

const int | extra_lbits [LENGTH_CODES] = {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}
const int | extra_dbits [D_CODES] = {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}
const int | extra_blbits [BL_CODES] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7}
const uch | bl_order [BL_CODES] = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15}
ct_data | static_ltree [L_CODES+2]
ct_data | static_dtree [D_CODES]
uch | _dist_code [DIST_CODE_LEN]
uch | _length_code [MAX_MATCH-MIN_MATCH+1]
int | base_length [LENGTH_CODES]
int | base_dist [D_CODES]
const static_tree_desc | static_l_desc
const static_tree_desc | static_d_desc
const static_tree_desc | static_bl_desc

## Macro Definition Documentation

## DIST_CODE_LEN

#define DIST_CODE_LEN 512 /* see definition of array dist_code below */

Definition at line 81 of file trees.c.

## END_BLOCK

#define END_BLOCK 256

Definition at line 50 of file trees.c.

## MAX_BL_BITS

#define MAX_BL_BITS 7

Definition at line 47 of file trees.c.

## pqremove

#define pqremove | ( |  | s,
|  |  | tree,
|  |  | top
| ) |  |

Value:
{\
top = s->heap[SMALLEST]; \
s->heap[SMALLEST] = s->heap[s->heap_len--]; \
pqdownheap(s, tree, SMALLEST); \
}
SMALLEST
#define SMALLEST
Definition: trees.c:422

Definition at line 430 of file trees.c.

## put_short

#define put_short | ( |  | s,
|  |  | w
| ) |  |

Value:
{ \
put_byte(s, (uch)((w) & 0xff)); \
put_byte(s, (uch)((ush)(w) >> 8)); \
}
ush
unsigned short ush
Definition: zutil.h:45
uch
unsigned char uch
Definition: zutil.h:43

Definition at line 174 of file trees.c.

## REP_3_6

#define REP_3_6 16

Definition at line 53 of file trees.c.

## REPZ_11_138

#define REPZ_11_138 18

Definition at line 59 of file trees.c.

## REPZ_3_10

#define REPZ_3_10 17

Definition at line 56 of file trees.c.

## send_bits

#define send_bits | ( |  | s,
|  |  | value,
|  |  | length
| ) |  |

Value:
{ int len = length;\
if (s->bi_valid > (int)Buf_size - len) {\
int val = (int)value;\
s->bi_buf |= (ush)val << s->bi_valid;\
put_short(s, s->bi_buf);\
s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
s->bi_valid += len - Buf_size;\
} else {\
s->bi_buf |= (ush)(value) << s->bi_valid;\
s->bi_valid += len;\
}\
}
Buf_size
#define Buf_size
Definition: deflate.h:51
put_short
#define put_short(s, w)
Definition: trees.c:174

Definition at line 211 of file trees.c.

## send_code

#define send_code | ( |  | s,
|  |  | c,
|  |  | tree
| ) |  | send_bits(s, tree[c].Code, tree[c].Len)

Definition at line 161 of file trees.c.

## smaller

#define smaller | ( |  | tree,
|  |  | n,
|  |  | m,
|  |  | depth
| ) |  |

Value:
(tree[n].Freq < tree[m].Freq || \
(tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))

Definition at line 441 of file trees.c.

## SMALLEST

#define SMALLEST 1

Definition at line 422 of file trees.c.

## Function Documentation

## _tr_align()

void ZLIB_INTERNAL _tr_align | ( | deflate_state * | s | ) |

Definition at line 896 of file trees.c.

## _tr_flush_bits()

void ZLIB_INTERNAL _tr_flush_bits | ( | deflate_state * | s | ) |

Definition at line 886 of file trees.c.

## _tr_flush_block()

void ZLIB_INTERNAL _tr_flush_block | ( | deflate_state * | s,
|  | charf * | buf,
|  | ulg | stored_len,
|  | int | last
| ) |  |

Definition at line 911 of file trees.c.

## _tr_init()

void ZLIB_INTERNAL _tr_init | ( | deflate_state * | s | ) |

Definition at line 379 of file trees.c.

## _tr_stored_block()

void ZLIB_INTERNAL _tr_stored_block | ( | deflate_state * | s,
|  | charf * | buf,
|  | ulg | stored_len,
|  | int | last
| ) |  |

Definition at line 863 of file trees.c.

## _tr_tally()

int ZLIB_INTERNAL _tr_tally | ( | deflate_state * | s,
|  | unsigned | dist,
|  | unsigned | lc
| ) |  |

Definition at line 1014 of file trees.c.

## bi_flush()

void bi_flush | ( | deflate_state * | s | ) |

Definition at line 1173 of file trees.c.

## bi_reverse()

unsigned bi_reverse | ( | unsigned | code,
|  | int | len
| ) |  |

Definition at line 1158 of file trees.c.

## bi_windup()

void bi_windup | ( | deflate_state * | s | ) |

Definition at line 1190 of file trees.c.

## build_bl_tree()

int build_bl_tree | ( | deflate_state * | s | ) |

Definition at line 799 of file trees.c.

## build_tree()

void build_tree | ( | deflate_state * | s,
|  | tree_desc * | desc
| ) |  |

Definition at line 615 of file trees.c.

## compress_block()

void compress_block | ( | deflate_state * | s,
|  | const ct_data * | ltree,
|  | const ct_data * | dtree
| ) |  |

Definition at line 1064 of file trees.c.

## detect_data_type()

int detect_data_type | ( | deflate_state * | s | ) |

Definition at line 1124 of file trees.c.

## gen_bitlen()

void gen_bitlen | ( | deflate_state * | s,
|  | tree_desc * | desc
| ) |  |

Definition at line 486 of file trees.c.

## gen_codes()

void gen_codes | ( | ct_data * | tree,
|  | int | max_code,
|  | ushf * | bl_count
| ) |  |

Definition at line 572 of file trees.c.

## init_block()

void init_block | ( | deflate_state * | s | ) |

Definition at line 407 of file trees.c.

## OF() [1/9]

void gen_codes OF | ( | (ct_data *tree, int max_code, ushf *bl_count) |  | ) |

## OF() [2/9]

void init_block OF | ( | (deflate_state *s) |  | ) |

## OF() [3/9]

void compress_block OF | ( | (deflate_state *s, const ct_data *ltree, const ct_data *dtree) |  | ) |

## OF() [4/9]

void pqdownheap OF | ( | (deflate_state *s, ct_data *tree, int k) |  | ) |

## OF() [5/9]

void scan_tree OF | ( | (deflate_state *s, ct_data *tree, int max_code) |  | ) |

## OF() [6/9]

void send_all_trees OF | ( | (deflate_state *s, int lcodes, int dcodes, int blcodes) |  | ) |

## OF() [7/9]

void gen_bitlen OF | ( | (deflate_state *s, tree_desc *desc) |  | ) |

## OF() [8/9]

unsigned bi_reverse OF | ( | (unsigned value, int length) |  | ) |

## OF() [9/9]

void tr_static_init OF | ( | (void) |  | ) |

## pqdownheap()

void pqdownheap | ( | deflate_state * | s,
|  | ct_data * | tree,
|  | int | k
| ) |  |

Definition at line 451 of file trees.c.

## scan_tree()

void scan_tree | ( | deflate_state * | s,
|  | ct_data * | tree,
|  | int | max_code
| ) |  |

Definition at line 703 of file trees.c.

## send_all_trees()

void send_all_trees | ( | deflate_state * | s,
|  | int | lcodes,
|  | int | dcodes,
|  | int | blcodes
| ) |  |

Definition at line 834 of file trees.c.

## send_tree()

void send_tree | ( | deflate_state * | s,
|  | ct_data * | tree,
|  | int | max_code
| ) |  |

Definition at line 748 of file trees.c.

## tr_static_init()

void tr_static_init | ( |  | ) |

Definition at line 232 of file trees.c.

## Variable Documentation

## _dist_code

uch _dist_code[DIST_CODE_LEN]

Definition at line 98 of file trees.c.

## _length_code

uch _length_code[MAX_MATCH-MIN_MATCH+1]

Definition at line 104 of file trees.c.

## base_dist

int base_dist[D_CODES]

Definition at line 110 of file trees.c.

## base_length

int base_length[LENGTH_CODES]

Definition at line 107 of file trees.c.

## bl_order

const uch bl_order[BL_CODES] = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15}

Definition at line 71 of file trees.c.

## extra_blbits

const int extra_blbits[BL_CODES] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7}

Definition at line 68 of file trees.c.

## extra_dbits

const int extra_dbits[D_CODES] = {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}

Definition at line 65 of file trees.c.

## extra_lbits

const int extra_lbits[LENGTH_CODES] = {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}

Definition at line 62 of file trees.c.

## static_bl_desc

const static_tree_desc static_bl_desc

Initial value:
=
{(const ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS}
BL_CODES
#define BL_CODES
Definition: deflate.h:42
ct_data_s
Definition: deflate.h:68
extra_blbits
const int extra_blbits[BL_CODES]
Definition: trees.c:69
MAX_BL_BITS
#define MAX_BL_BITS
Definition: trees.c:47

Definition at line 131 of file trees.c.

## static_d_desc

const static_tree_desc static_d_desc

Initial value:
=
{static_dtree, extra_dbits, 0, D_CODES, MAX_BITS}
MAX_BITS
#define MAX_BITS
Definition: deflate.h:48
D_CODES
#define D_CODES
Definition: deflate.h:39
static_dtree
ct_data static_dtree[D_CODES]
Definition: trees.c:93
extra_dbits
const int extra_dbits[D_CODES]
Definition: trees.c:66

Definition at line 128 of file trees.c.

## static_dtree

ct_data static_dtree[D_CODES]

Definition at line 93 of file trees.c.

## static_l_desc

const static_tree_desc static_l_desc

Initial value:
=
{static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS}
L_CODES
#define L_CODES
Definition: deflate.h:36
LITERALS
#define LITERALS
Definition: deflate.h:33
extra_lbits
const int extra_lbits[LENGTH_CODES]
Definition: trees.c:63
static_ltree
ct_data static_ltree[L_CODES+2]
Definition: trees.c:86

Definition at line 125 of file trees.c.

## static_ltree

ct_data static_ltree[L_CODES+2]

Definition at line 86 of file trees.c.