1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2016 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_a(NULL, size);
36 }
37
38 UcxMap *ucx_map_new_a(UcxAllocator *allocator, size_t size) {
39 if(size == 0) {
40 size = 16;
41 }
42
43 if(!allocator) {
44 allocator = ucx_default_allocator();
45 }
46
47 UcxMap *map = (UcxMap*)almalloc(allocator, sizeof(UcxMap));
48 if (!map) {
49 return NULL;
50 }
51
52 map->allocator = allocator;
53 map->map = (UcxMapElement**)alcalloc(
54 allocator, size, sizeof(UcxMapElement*));
55 if(map->map == NULL) {
56 alfree(allocator, map);
57 return NULL;
58 }
59 map->size = size;
60 map->count = 0;
61
62 return map;
63 }
64
65 static void ucx_map_free_elmlist_contents(UcxMap *map) {
66 for (size_t n = 0 ; n < map->size ; n++) {
67 UcxMapElement *elem = map->map[n];
68 if (elem != NULL) {
69 do {
70 UcxMapElement *next = elem->next;
71 alfree(map->allocator, elem->key.data);
72 alfree(map->allocator, elem);
73 elem = next;
74 } while (elem != NULL);
75 }
76 }
77 }
78
79 void ucx_map_free(UcxMap *map) {
80 ucx_map_free_elmlist_contents(map);
81 alfree(map->allocator, map->map);
82 alfree(map->allocator, map);
83 }
84
85 void ucx_map_free_content(UcxMap *map, ucx_destructor destr) {
86 UcxMapIterator iter = ucx_map_iterator(map);
87 void *val;
88 UCX_MAP_FOREACH(key, val, iter) {
89 destr(val);
90 }
91 }
92
93 void ucx_map_clear(UcxMap *map) {
94 if (map->count == 0) {
95 return; // nothing to do
96 }
97 ucx_map_free_elmlist_contents(map);
98 memset(map->map, 0, map->size*sizeof(UcxMapElement*));
99 map->count = 0;
100 }
101
102 int ucx_map_copy(UcxMap *restrict from, UcxMap *restrict to,
103 copy_func fnc, void *data) {
104 UcxMapIterator i = ucx_map_iterator(from);
105 void *value;
106 UCX_MAP_FOREACH(key, value, i) {
107 if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
108 return 1;
109 }
110 }
111 return 0;
112 }
113
114 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
115 size_t bs = (map->count * 5) >> 1;
116 UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
117 if (!newmap) {
118 return NULL;
119 }
120 ucx_map_copy(map, newmap, fnc, data);
121 return newmap;
122 }
123
124 int ucx_map_rehash(UcxMap *map) {
125 size_t load = (map->size * 3) >> 2;
126 if (map->count > load) {
127 UcxMap oldmap;
128 oldmap.map = map->map;
129 oldmap.size = map->size;
130 oldmap.count = map->count;
131 oldmap.allocator = map->allocator;
132
133 map->size = (map->count * 5) >> 1;
134 map->map = (UcxMapElement**)alcalloc(
135 map->allocator, map->size, sizeof(UcxMapElement*));
136 if (!map->map) {
137 *map = oldmap;
138 return 1;
139 }
140 map->count = 0;
141 ucx_map_copy(&oldmap, map, NULL, NULL);
142
143 /* free the UcxMapElement list of oldmap */
144 ucx_map_free_elmlist_contents(&oldmap);
145 alfree(map->allocator, oldmap.map);
146 }
147 return 0;
148 }
149
150 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
151 UcxAllocator *allocator = map->allocator;
152
153 if (key.hash == 0) {
154 key.hash = ucx_hash((char*)key.data, key.len);
155 }
156
157 size_t slot = key.hash%map->size;
158 UcxMapElement *restrict elm = map->map[slot];
159 UcxMapElement *restrict prev = NULL;
160
161 while (elm && elm->key.hash < key.hash) {
162 prev = elm;
163 elm = elm->next;
164 }
165
166 if (!elm || elm->key.hash != key.hash) {
167 UcxMapElement *e = (UcxMapElement*)almalloc(
168 allocator, sizeof(UcxMapElement));
169 if (!e) {
170 return -1;
171 }
172 e->key.data = NULL;
173 if (prev) {
174 prev->next = e;
175 } else {
176 map->map[slot] = e;
177 }
178 e->next = elm;
179 elm = e;
180 }
181
182 if (!elm->key.data) {
183 void *kd = almalloc(allocator, key.len);
184 if (!kd) {
185 return -1;
186 }
187 memcpy(kd, key.data, key.len);
188 key.data = kd;
189 elm->key = key;
190 map->count++;
191 }
192 elm->data = data;
193
194 return 0;
195 }
196
197 void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, _Bool remove) {
198 if(key.hash == 0) {
199 key.hash = ucx_hash((char*)key.data, key.len);
200 }
201
202 size_t slot = key.hash%map->size;
203 UcxMapElement *restrict elm = map->map[slot];
204 UcxMapElement *restrict pelm = NULL;
205 while (elm && elm->key.hash <= key.hash) {
206 if(elm->key.hash == key.hash) {
207 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
208 if (memcmp(elm->key.data, key.data, n) == 0) {
209 void *data = elm->data;
210 if (remove) {
211 if (pelm) {
212 pelm->next = elm->next;
213 } else {
214 map->map[slot] = elm->next;
215 }
216 alfree(map->allocator, elm->key.data);
217 alfree(map->allocator, elm);
218 map->count--;
219 }
220
221 return data;
222 }
223 }
224 pelm = elm;
225 elm = pelm->next;
226 }
227
228 return NULL;
229 }
230
231 void *ucx_map_get(UcxMap *map, UcxKey key) {
232 return ucx_map_get_and_remove(map, key, 0);
233 }
234
235 void *ucx_map_remove(UcxMap *map, UcxKey key) {
236 return ucx_map_get_and_remove(map, key, 1);
237 }
238
239 UcxKey ucx_key(void *data, size_t len) {
240 UcxKey key;
241 key.data = data;
242 key.len = len;
243 key.hash = ucx_hash((const char*) data, len);
244 return key;
245 }
246
247
248 int ucx_hash(const char *data, size_t len) {
249 /* murmur hash 2 */
250
251 int m = 0x5bd1e995;
252 int r = 24;
253
254 int h = 25 ^ len;
255
256 int i = 0;
257 while (len >= 4) {
258 int k = data[i + 0] & 0xFF;
259 k |= (data[i + 1] & 0xFF) << 8;
260 k |= (data[i + 2] & 0xFF) << 16;
261 k |= (data[i + 3] & 0xFF) << 24;
262
263 k *= m;
264 k ^= k >> r;
265 k *= m;
266
267 h *= m;
268 h ^= k;
269
270 i += 4;
271 len -= 4;
272 }
273
274 switch (len) {
275 case 3: h ^= (data[i + 2] & 0xFF) << 16;
276 /* no break */
277 case 2: h ^= (data[i + 1] & 0xFF) << 8;
278 /* no break */
279 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
280 /* no break */
281 }
282
283 h ^= h >> 13;
284 h *= m;
285 h ^= h >> 15;
286
287 return h;
288 }
289
290 UcxMapIterator ucx_map_iterator(UcxMap *map) {
291 UcxMapIterator i;
292 i.map = map;
293 i.cur = NULL;
294 i.index = 0;
295 return i;
296 }
297
298 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
299 UcxMapElement *e = i->cur;
300
301 if (e) {
302 e = e->next;
303 } else {
304 e = i->map->map[0];
305 }
306
307 while (i->index < i->map->size) {
308 if (e) {
309 if (e->data) {
310 i->cur = e;
311 *elm = e->data;
312 *key = e->key;
313 return 1;
314 }
315
316 e = e->next;
317 } else {
318 i->index++;
319
320 if (i->index < i->map->size) {
321 e = i->map->map[i->index];
322 }
323 }
324 }
325
326 return 0;
327 }
328
329