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comparison: src/server/ucx/map.c

src/server/ucx/map.c

changeset 95
74a81d9e19d0
parent 94
6b15a094d996
child 96
0185b13bf41f
equal deleted inserted replaced
94:6b15a094d996 95:74a81d9e19d0
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2013 Olaf Wintermann. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include "map.h"
33
34 UcxMap *ucx_map_new(size_t size) {
35 return ucx_map_new_allocator(size, NULL);
36 }
37
38 UcxMap *ucx_map_new_allocator(size_t size, UcxAllocator *allocator) {
39 if(size == 0) {
40 size = 16;
41 }
42
43 if(!allocator) {
44 allocator = ucx_default_allocator();
45 }
46
47 UcxMap *map = (UcxMap*)allocator->malloc(allocator->pool, sizeof(UcxMap));
48 if(map == NULL) {
49 return NULL;
50 }
51
52 map->allocator = allocator;
53 map->map = (UcxMapElement**)allocator->calloc(
54 allocator->pool,
55 size,
56 sizeof(UcxMapElement*));
57 if(map->map == NULL) {
58 allocator->free(allocator->pool, map);
59 return NULL;
60 }
61 map->size = size;
62 map->count = 0;
63
64 return map;
65 }
66
67 void ucx_map_free_elmlist(UcxMap *map) {
68 for (size_t n = 0 ; n < map->size ; n++) {
69 UcxMapElement *elem = map->map[n];
70 if (elem != NULL) {
71 do {
72 UcxMapElement *next = elem->next;
73 map->allocator->free(map->allocator->pool, elem->key.data);
74 map->allocator->free(map->allocator->pool, elem);
75 elem = next;
76 } while (elem != NULL);
77 }
78 }
79 map->allocator->free(map->allocator->pool, map->map);
80 }
81
82 void ucx_map_free(UcxMap *map) {
83 ucx_map_free_elmlist(map);
84 map->allocator->free(map->allocator->pool, map);
85 }
86
87 int ucx_map_copy(UcxMap *restrict from, UcxMap *restrict to,
88 copy_func fnc, void *data) {
89 UcxMapIterator i = ucx_map_iterator(from);
90 void *value;
91 UCX_MAP_FOREACH(key, value, i) {
92 int ret = ucx_map_put(to, i.cur->key, fnc ? fnc(value, data) : value);
93 if(ret != 0) {
94 return 1;
95 }
96 }
97 return 0;
98 }
99
100 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
101 size_t bs = (map->count * 5) >> 1;
102 UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
103 if(newmap == NULL) {
104 return NULL;
105 }
106 ucx_map_copy(map, newmap, fnc, data);
107 return newmap;
108 }
109
110 int ucx_map_rehash(UcxMap *map) {
111 size_t load = (map->size * 3) >> 2;
112 if (map->count > load) {
113 UcxMap oldmap;
114 oldmap.map = map->map;
115 oldmap.size = map->size;
116 oldmap.count = map->count;
117 oldmap.allocator = map->allocator;
118
119 map->size = (map->count * 5) >> 1;
120 map->map = (UcxMapElement**)map->allocator->calloc(
121 map->allocator->pool,
122 map->size,
123 sizeof(UcxMapElement*));
124 if(map->map == NULL) {
125 *map = oldmap;
126 return 1;
127 }
128 map->count = 0;
129 ucx_map_copy(&oldmap, map, NULL, NULL);
130
131 /* free the UcxMapElement list of oldmap */
132 ucx_map_free_elmlist(&oldmap);
133 }
134 return 0;
135 }
136
137 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
138 UcxAllocator *allocator = map->allocator;
139
140 if(key.hash == 0) {
141 key.hash = ucx_hash((char*)key.data, key.len);
142 }
143
144 size_t slot = key.hash%map->size;
145 UcxMapElement *restrict elm = map->map[slot];
146 UcxMapElement *restrict prev = NULL;
147
148 while (elm != NULL && elm->key.hash < key.hash) {
149 prev = elm;
150 elm = elm->next;
151 }
152
153 if (elm == NULL || elm->key.hash != key.hash) {
154 UcxMapElement *e = (UcxMapElement*)allocator->malloc(
155 allocator->pool,
156 sizeof(UcxMapElement));
157 if(e == NULL) {
158 return -1;
159 }
160 e->key.data = NULL;
161 if (prev) {
162 prev->next = e;
163 } else {
164 map->map[slot] = e;
165 }
166 e->next = elm;
167 elm = e;
168 }
169
170 if(elm->key.data == NULL) {
171 void *kd = allocator->malloc(allocator->pool, key.len);
172 if (kd == NULL) {
173 return -1;
174 }
175 memcpy(kd, key.data, key.len);
176 key.data = kd;
177 elm->key = key;
178 map->count++;
179 }
180 elm->data = data;
181
182 return 0;
183 }
184
185 void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, _Bool remove) {
186 if(key.hash == 0) {
187 key.hash = ucx_hash((char*)key.data, key.len);
188 }
189
190 size_t slot = key.hash%map->size;
191 UcxMapElement *restrict elm = map->map[slot];
192 UcxMapElement *restrict pelm = NULL;
193 while (elm && elm->key.hash <= key.hash) {
194 if(elm->key.hash == key.hash) {
195 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
196 if (memcmp(elm->key.data, key.data, n) == 0) {
197 void *data = elm->data;
198 if (remove) {
199 if (pelm) {
200 pelm->next = elm->next;
201 } else {
202 map->map[slot] = elm->next;
203 }
204 map->allocator->free(map->allocator->pool, elm);
205 map->count--;
206 }
207
208 return data;
209 }
210 }
211 pelm = elm;
212 elm = pelm->next;
213 }
214
215 return NULL;
216 }
217
218 void *ucx_map_get(UcxMap *map, UcxKey key) {
219 return ucx_map_get_and_remove(map, key, 0);
220 }
221
222 void *ucx_map_remove(UcxMap *map, UcxKey key) {
223 return ucx_map_get_and_remove(map, key, 1);
224 }
225
226 UcxKey ucx_key(void *data, size_t len) {
227 UcxKey key;
228 key.data = data;
229 key.len = len;
230 key.hash = ucx_hash((const char*) data, len);
231 return key;
232 }
233
234
235 int ucx_hash(const char *data, size_t len) {
236 /* murmur hash 2 */
237
238 int m = 0x5bd1e995;
239 int r = 24;
240
241 int h = 25 ^ len;
242
243 int i = 0;
244 while (len >= 4) {
245 int k = data[i + 0] & 0xFF;
246 k |= (data[i + 1] & 0xFF) << 8;
247 k |= (data[i + 2] & 0xFF) << 16;
248 k |= (data[i + 3] & 0xFF) << 24;
249
250 k *= m;
251 k ^= k >> r;
252 k *= m;
253
254 h *= m;
255 h ^= k;
256
257 i += 4;
258 len -= 4;
259 }
260
261 switch (len) {
262 case 3: h ^= (data[i + 2] & 0xFF) << 16;
263 /* no break */
264 case 2: h ^= (data[i + 1] & 0xFF) << 8;
265 /* no break */
266 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
267 /* no break */
268 }
269
270 h ^= h >> 13;
271 h *= m;
272 h ^= h >> 15;
273
274 return h;
275 }
276
277 UcxMapIterator ucx_map_iterator(UcxMap *map) {
278 UcxMapIterator i;
279 i.map = map;
280 i.cur = NULL;
281 i.index = 0;
282 return i;
283 }
284
285 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
286 UcxMapElement *e = i->cur;
287
288 if(e == NULL) {
289 e = i->map->map[0];
290 } else {
291 e = e->next;
292 }
293
294 while(i->index < i->map->size) {
295 if(e != NULL) {
296 if(e->data != NULL) {
297 i->cur = e;
298 *elm = e->data;
299 *key = e->key;
300 return 0;
301 }
302
303 e = e->next;
304 } else {
305 i->index++;
306
307 if(i->index < i->map->size) {
308 e = i->map->map[i->index];
309 }
310 }
311 }
312
313 return 1;
314 }
315

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