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comparison: ucx/map.c

ucx/map.c

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1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2017 Mike Becker, 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 "ucx/map.h"
30
31 #include <stdlib.h>
32 #include <string.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 if (destr) {
90 destr(val);
91 } else {
92 alfree(map->allocator, val);
93 }
94 }
95 }
96
97 void ucx_map_clear(UcxMap *map) {
98 if (map->count == 0) {
99 return; // nothing to do
100 }
101 ucx_map_free_elmlist_contents(map);
102 memset(map->map, 0, map->size*sizeof(UcxMapElement*));
103 map->count = 0;
104 }
105
106 int ucx_map_copy(UcxMap const *from, UcxMap *to, copy_func fnc, void *data) {
107 UcxMapIterator i = ucx_map_iterator(from);
108 void *value;
109 UCX_MAP_FOREACH(key, value, i) {
110 if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
111 return 1;
112 }
113 }
114 return 0;
115 }
116
117 UcxMap *ucx_map_clone(UcxMap const *map, copy_func fnc, void *data) {
118 return ucx_map_clone_a(ucx_default_allocator(), map, fnc, data);
119 }
120
121 UcxMap *ucx_map_clone_a(UcxAllocator *allocator,
122 UcxMap const *map, copy_func fnc, void *data) {
123 size_t bs = (map->count * 5) >> 1;
124 UcxMap *newmap = ucx_map_new_a(allocator, bs > map->size ? bs : map->size);
125 if (!newmap) {
126 return NULL;
127 }
128 ucx_map_copy(map, newmap, fnc, data);
129 return newmap;
130 }
131
132 int ucx_map_rehash(UcxMap *map) {
133 size_t load = (map->size * 3) >> 2;
134 if (map->count > load) {
135 UcxMap oldmap;
136 oldmap.map = map->map;
137 oldmap.size = map->size;
138 oldmap.count = map->count;
139 oldmap.allocator = map->allocator;
140
141 map->size = (map->count * 5) >> 1;
142 map->map = (UcxMapElement**)alcalloc(
143 map->allocator, map->size, sizeof(UcxMapElement*));
144 if (!map->map) {
145 *map = oldmap;
146 return 1;
147 }
148 map->count = 0;
149 ucx_map_copy(&oldmap, map, NULL, NULL);
150
151 /* free the UcxMapElement list of oldmap */
152 ucx_map_free_elmlist_contents(&oldmap);
153 alfree(map->allocator, oldmap.map);
154 }
155 return 0;
156 }
157
158 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
159 UcxAllocator *allocator = map->allocator;
160
161 if (key.hash == 0) {
162 key.hash = ucx_hash((const char*)key.data, key.len);
163 }
164
165 struct UcxMapKey mapkey;
166 mapkey.hash = key.hash;
167
168 size_t slot = mapkey.hash%map->size;
169 UcxMapElement *elm = map->map[slot];
170 UcxMapElement *prev = NULL;
171
172 while (elm && elm->key.hash < mapkey.hash) {
173 prev = elm;
174 elm = elm->next;
175 }
176
177 if (!elm || elm->key.hash != mapkey.hash) {
178 UcxMapElement *e = (UcxMapElement*)almalloc(
179 allocator, sizeof(UcxMapElement));
180 if (!e) {
181 return -1;
182 }
183 e->key.data = NULL;
184 if (prev) {
185 prev->next = e;
186 } else {
187 map->map[slot] = e;
188 }
189 e->next = elm;
190 elm = e;
191 }
192
193 if (!elm->key.data) {
194 void *kd = almalloc(allocator, key.len);
195 if (!kd) {
196 return -1;
197 }
198 memcpy(kd, key.data, key.len);
199 mapkey.data = kd;
200 mapkey.len = key.len;
201 elm->key = mapkey;
202 map->count++;
203 }
204 elm->data = data;
205
206 return 0;
207 }
208
209 static void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, int remove) {
210 if(key.hash == 0) {
211 key.hash = ucx_hash((const char*)key.data, key.len);
212 }
213
214 size_t slot = key.hash%map->size;
215 UcxMapElement *elm = map->map[slot];
216 UcxMapElement *pelm = NULL;
217 while (elm && elm->key.hash <= key.hash) {
218 if(elm->key.hash == key.hash) {
219 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
220 if (memcmp(elm->key.data, key.data, n) == 0) {
221 void *data = elm->data;
222 if (remove) {
223 if (pelm) {
224 pelm->next = elm->next;
225 } else {
226 map->map[slot] = elm->next;
227 }
228 alfree(map->allocator, elm->key.data);
229 alfree(map->allocator, elm);
230 map->count--;
231 }
232
233 return data;
234 }
235 }
236 pelm = elm;
237 elm = pelm->next;
238 }
239
240 return NULL;
241 }
242
243 void *ucx_map_get(UcxMap const *map, UcxKey key) {
244 return ucx_map_get_and_remove((UcxMap *)map, key, 0);
245 }
246
247 void *ucx_map_remove(UcxMap *map, UcxKey key) {
248 return ucx_map_get_and_remove(map, key, 1);
249 }
250
251 UcxKey ucx_key(const void *data, size_t len) {
252 UcxKey key;
253 key.data = data;
254 key.len = len;
255 key.hash = ucx_hash((const char*)data, len);
256 return key;
257 }
258
259
260 int ucx_hash(const char *data, size_t len) {
261 /* murmur hash 2 */
262
263 int m = 0x5bd1e995;
264 int r = 24;
265
266 int h = 25 ^ len;
267
268 int i = 0;
269 while (len >= 4) {
270 int k = data[i + 0] & 0xFF;
271 k |= (data[i + 1] & 0xFF) << 8;
272 k |= (data[i + 2] & 0xFF) << 16;
273 k |= (data[i + 3] & 0xFF) << 24;
274
275 k *= m;
276 k ^= k >> r;
277 k *= m;
278
279 h *= m;
280 h ^= k;
281
282 i += 4;
283 len -= 4;
284 }
285
286 switch (len) {
287 case 3: h ^= (data[i + 2] & 0xFF) << 16;
288 /* no break */
289 case 2: h ^= (data[i + 1] & 0xFF) << 8;
290 /* no break */
291 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
292 /* no break */
293 }
294
295 h ^= h >> 13;
296 h *= m;
297 h ^= h >> 15;
298
299 return h;
300 }
301
302 UcxMapIterator ucx_map_iterator(UcxMap const *map) {
303 UcxMapIterator i;
304 i.map = map;
305 i.cur = NULL;
306 i.index = 0;
307 return i;
308 }
309
310 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
311 UcxMapElement *e = i->cur;
312
313 if (e) {
314 e = e->next;
315 } else {
316 e = i->map->map[0];
317 }
318
319 while (i->index < i->map->size) {
320 if (e) {
321 if (e->data) {
322 i->cur = e;
323 *elm = e->data;
324 key->data = e->key.data;
325 key->hash = e->key.hash;
326 key->len = e->key.len;
327 return 1;
328 }
329
330 e = e->next;
331 } else {
332 i->index++;
333
334 if (i->index < i->map->size) {
335 e = i->map->map[i->index];
336 }
337 }
338 }
339
340 return 0;
341 }
342
343 UcxMap* ucx_map_union(const UcxMap *first, const UcxMap *second,
344 copy_func cpfnc, void* cpdata) {
345 return ucx_map_union_a(ucx_default_allocator(),
346 first, second, cpfnc, cpdata);
347 }
348
349 UcxMap* ucx_map_union_a(UcxAllocator *allocator,
350 const UcxMap *first, const UcxMap *second,
351 copy_func cpfnc, void* cpdata) {
352 UcxMap* result = ucx_map_clone_a(allocator, first, cpfnc, cpdata);
353 ucx_map_copy(second, result, cpfnc, cpdata);
354 return result;
355 }
356
357 UcxMap* ucx_map_intersection(const UcxMap *first, const UcxMap *second,
358 copy_func cpfnc, void* cpdata) {
359 return ucx_map_intersection_a(ucx_default_allocator(),
360 first, second, cpfnc, cpdata);
361 }
362
363 UcxMap* ucx_map_intersection_a(UcxAllocator *allocator,
364 const UcxMap *first, const UcxMap *second,
365 copy_func cpfnc, void* cpdata) {
366 UcxMap *result = ucx_map_new_a(allocator, first->size < second->size ?
367 first->size : second->size);
368
369 UcxMapIterator iter = ucx_map_iterator(first);
370 void* value;
371 UCX_MAP_FOREACH(key, value, iter) {
372 if (ucx_map_get(second, key)) {
373 ucx_map_put(result, key, cpfnc ? cpfnc(value, cpdata) : value);
374 }
375 }
376
377 return result;
378 }
379
380 UcxMap* ucx_map_difference(const UcxMap *first, const UcxMap *second,
381 copy_func cpfnc, void* cpdata) {
382 return ucx_map_difference_a(ucx_default_allocator(),
383 first, second, cpfnc, cpdata);
384 }
385
386 UcxMap* ucx_map_difference_a(UcxAllocator *allocator,
387 const UcxMap *first, const UcxMap *second,
388 copy_func cpfnc, void* cpdata) {
389
390 UcxMap *result = ucx_map_new_a(allocator, first->size - second->count);
391
392 UcxMapIterator iter = ucx_map_iterator(first);
393 void* value;
394 UCX_MAP_FOREACH(key, value, iter) {
395 if (!ucx_map_get(second, key)) {
396 ucx_map_put(result, key, cpfnc ? cpfnc(value, cpdata) : value);
397 }
398 }
399
400 ucx_map_rehash(result);
401 return result;
402 }

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