release/src/router/nginx/src/core/ngx_hash.h

   1
   2 /*
   3  * Copyright (C) Igor Sysoev
   4  * Copyright (C) Nginx, Inc.
   5  */
   6
   7
   8 #ifndef _NGX_HASH_H_INCLUDED_
   9 #define _NGX_HASH_H_INCLUDED_
  10
  11
  12 #include <ngx_config.h>
  13 #include <ngx_core.h>
  14
  15
  16 typedef struct {
  17     void             *value;
  18     u_short           len;
  19     u_char            name[1];
  20 } ngx_hash_elt_t;
  21
  22
  23 typedef struct {
  24     ngx_hash_elt_t  **buckets;
  25     ngx_uint_t        size;
  26 } ngx_hash_t;
  27
  28
  29 typedef struct {
  30     ngx_hash_t        hash;
  31     void             *value;
  32 } ngx_hash_wildcard_t;
  33
  34
  35 typedef struct {
  36     ngx_str_t         key;
  37     ngx_uint_t        key_hash;
  38     void             *value;
  39 } ngx_hash_key_t;
  40
  41
  42 typedef ngx_uint_t (*ngx_hash_key_pt) (u_char *data, size_t len);
  43
  44
  45 typedef struct {
  46     ngx_hash_t            hash;
  47     ngx_hash_wildcard_t  *wc_head;
  48     ngx_hash_wildcard_t  *wc_tail;
  49 } ngx_hash_combined_t;
  50
  51
  52 typedef struct {
  53     ngx_hash_t       *hash;
  54     ngx_hash_key_pt   key;
  55
  56     ngx_uint_t        max_size;
  57     ngx_uint_t        bucket_size;
  58
  59     char             *name;
  60     ngx_pool_t       *pool;
  61     ngx_pool_t       *temp_pool;
  62 } ngx_hash_init_t;
  63
  64
  65 #define NGX_HASH_SMALL            1
  66 #define NGX_HASH_LARGE            2
  67
  68 #define NGX_HASH_LARGE_ASIZE      16384
  69 #define NGX_HASH_LARGE_HSIZE      10007
  70
  71 #define NGX_HASH_WILDCARD_KEY     1
  72 #define NGX_HASH_READONLY_KEY     2
  73
  74
  75 typedef struct {
  76     ngx_uint_t        hsize;
  77
  78     ngx_pool_t       *pool;
  79     ngx_pool_t       *temp_pool;
  80
  81     ngx_array_t       keys;
  82     ngx_array_t      *keys_hash;
  83
  84     ngx_array_t       dns_wc_head;
  85     ngx_array_t      *dns_wc_head_hash;
  86
  87     ngx_array_t       dns_wc_tail;
  88     ngx_array_t      *dns_wc_tail_hash;
  89 } ngx_hash_keys_arrays_t;
  90
  91
  92 typedef struct {
  93     ngx_uint_t        hash;
  94     ngx_str_t         key;
  95     ngx_str_t         value;
  96     u_char           *lowcase_key;
  97 } ngx_table_elt_t;
  98
  99
 100 void *ngx_hash_find(ngx_hash_t *hash, ngx_uint_t key, u_char *name, size_t len);
 101 void *ngx_hash_find_wc_head(ngx_hash_wildcard_t *hwc, u_char *name, size_t len);
 102 void *ngx_hash_find_wc_tail(ngx_hash_wildcard_t *hwc, u_char *name, size_t len);
 103 void *ngx_hash_find_combined(ngx_hash_combined_t *hash, ngx_uint_t key,
 104     u_char *name, size_t len);
 105
 106 ngx_int_t ngx_hash_init(ngx_hash_init_t *hinit, ngx_hash_key_t *names,
 107     ngx_uint_t nelts);
 108 ngx_int_t ngx_hash_wildcard_init(ngx_hash_init_t *hinit, ngx_hash_key_t *names,
 109     ngx_uint_t nelts);
 110
 111 #define ngx_hash(key, c)   ((ngx_uint_t) key * 31 + c)
 112 ngx_uint_t ngx_hash_key(u_char *data, size_t len);
 113 ngx_uint_t ngx_hash_key_lc(u_char *data, size_t len);
 114 ngx_uint_t ngx_hash_strlow(u_char *dst, u_char *src, size_t n);
 115
 116
 117 ngx_int_t ngx_hash_keys_array_init(ngx_hash_keys_arrays_t *ha, ngx_uint_t type);
 118 ngx_int_t ngx_hash_add_key(ngx_hash_keys_arrays_t *ha, ngx_str_t *key,
 119     void *value, ngx_uint_t flags);
 120
 121
 122 #endif /* _NGX_HASH_H_INCLUDED_ */