2 * Copyright © 2008 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 #ifndef STRING_TO_UINT_MAP_H
26 #define STRING_TO_UINT_MAP_H
30 #include "util/hash_table.h"
32 struct string_to_uint_map
;
38 struct string_to_uint_map
*
39 string_to_uint_map_ctor();
42 string_to_uint_map_dtor(struct string_to_uint_map
*);
48 struct string_map_iterate_wrapper_closure
{
49 void (*callback
)(const char *key
, unsigned value
, void *closure
);
54 * Map from a string (name) to an unsigned integer value
57 * Because of the way this class interacts with the \c hash_table
58 * implementation, values of \c UINT_MAX cannot be stored in the map.
60 struct string_to_uint_map
{
64 this->ht
= _mesa_hash_table_create(NULL
, _mesa_hash_string
,
65 _mesa_key_string_equal
);
70 hash_table_call_foreach(this->ht
, delete_key
, NULL
);
71 _mesa_hash_table_destroy(this->ht
, NULL
);
75 * Remove all mappings from this map.
79 hash_table_call_foreach(this->ht
, delete_key
, NULL
);
80 _mesa_hash_table_clear(this->ht
, NULL
);
84 * Runs a passed callback for the hash
86 void iterate(void (*func
)(const char *, unsigned, void *), void *closure
)
88 struct string_map_iterate_wrapper_closure
*wrapper
;
90 wrapper
= (struct string_map_iterate_wrapper_closure
*)
91 malloc(sizeof(struct string_map_iterate_wrapper_closure
));
95 wrapper
->callback
= func
;
96 wrapper
->closure
= closure
;
98 hash_table_call_foreach(this->ht
, subtract_one_wrapper
, wrapper
);
103 * Get the value associated with a particular key
106 * If \c key is found in the map, \c true is returned. Otherwise \c false
110 * If \c key is not found in the table, \c value is not modified.
112 bool get(unsigned &value
, const char *key
)
114 hash_entry
*entry
= _mesa_hash_table_search(this->ht
,
120 const intptr_t v
= (intptr_t) entry
->data
;
121 value
= (unsigned)(v
- 1);
125 void put(unsigned value
, const char *key
)
127 /* The low-level hash table structure returns NULL if key is not in the
128 * hash table. However, users of this map might want to store zero as a
129 * valid value in the table. Bias the value by +1 so that a
130 * user-specified zero is stored as 1. This enables ::get to tell the
131 * difference between a user-specified zero (returned as 1 by
132 * _mesa_hash_table_search) and the key not in the table (returned as 0 by
133 * _mesa_hash_table_search).
135 * The net effect is that we can't store UINT_MAX in the table. This is
136 * because UINT_MAX+1 = 0.
138 assert(value
!= UINT_MAX
);
139 char *dup_key
= strdup(key
);
141 struct hash_entry
*entry
= _mesa_hash_table_search(this->ht
, dup_key
);
143 entry
->data
= (void *) (intptr_t) (value
+ 1);
145 _mesa_hash_table_insert(this->ht
, dup_key
,
146 (void *) (intptr_t) (value
+ 1));
154 static void delete_key(const void *key
, void *data
, void *closure
)
162 static void subtract_one_wrapper(const void *key
, void *data
, void *closure
)
164 struct string_map_iterate_wrapper_closure
*wrapper
=
165 (struct string_map_iterate_wrapper_closure
*) closure
;
166 unsigned value
= (intptr_t) data
;
170 wrapper
->callback((const char *) key
, value
, wrapper
->closure
);
173 struct hash_table
*ht
;
176 #endif /* __cplusplus */
177 #endif /* STRING_TO_UINT_MAP_H */