src/core/ngx_hash.h

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