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e0b9ff5f MT |
1 | /* |
2 | libloc - A library to determine the location of someone on the Internet | |
3 | ||
4 | Copyright (C) 2020 IPFire Development Team <info@ipfire.org> | |
5 | ||
6 | This library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | This library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <errno.h> | |
18 | #include <stdlib.h> | |
af4689bf | 19 | #include <time.h> |
e0b9ff5f MT |
20 | |
21 | #include <loc/libloc.h> | |
22 | #include <loc/network.h> | |
23 | #include <loc/private.h> | |
24 | ||
25 | struct loc_network_list { | |
26 | struct loc_ctx* ctx; | |
27 | int refcount; | |
28 | ||
3b44e421 MT |
29 | struct loc_network** elements; |
30 | size_t elements_size; | |
31 | ||
e0b9ff5f | 32 | size_t size; |
e0b9ff5f MT |
33 | }; |
34 | ||
3b44e421 MT |
35 | static int loc_network_list_grow(struct loc_network_list* list, size_t size) { |
36 | DEBUG(list->ctx, "Growing network list %p by %zu to %zu\n", | |
37 | list, size, list->elements_size + size); | |
38 | ||
39 | struct loc_network** elements = reallocarray(list->elements, | |
40 | list->elements_size + size, sizeof(*list->elements)); | |
41 | if (!elements) | |
42 | return -errno; | |
43 | ||
44 | list->elements = elements; | |
45 | list->elements_size += size; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
e0b9ff5f MT |
50 | LOC_EXPORT int loc_network_list_new(struct loc_ctx* ctx, |
51 | struct loc_network_list** list) { | |
52 | struct loc_network_list* l = calloc(1, sizeof(*l)); | |
53 | if (!l) | |
54 | return -ENOMEM; | |
55 | ||
56 | l->ctx = loc_ref(ctx); | |
57 | l->refcount = 1; | |
58 | ||
e0b9ff5f MT |
59 | DEBUG(l->ctx, "Network list allocated at %p\n", l); |
60 | *list = l; | |
61 | return 0; | |
62 | } | |
63 | ||
64 | LOC_EXPORT struct loc_network_list* loc_network_list_ref(struct loc_network_list* list) { | |
65 | list->refcount++; | |
66 | ||
67 | return list; | |
68 | } | |
69 | ||
70 | static void loc_network_list_free(struct loc_network_list* list) { | |
71 | DEBUG(list->ctx, "Releasing network list at %p\n", list); | |
72 | ||
73 | for (unsigned int i = 0; i < list->size; i++) | |
3b44e421 | 74 | loc_network_unref(list->elements[i]); |
e0b9ff5f MT |
75 | |
76 | loc_unref(list->ctx); | |
77 | free(list); | |
78 | } | |
79 | ||
80 | LOC_EXPORT struct loc_network_list* loc_network_list_unref(struct loc_network_list* list) { | |
81 | if (!list) | |
82 | return NULL; | |
83 | ||
84 | if (--list->refcount > 0) | |
85 | return list; | |
86 | ||
87 | loc_network_list_free(list); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | LOC_EXPORT size_t loc_network_list_size(struct loc_network_list* list) { | |
92 | return list->size; | |
93 | } | |
94 | ||
95 | LOC_EXPORT int loc_network_list_empty(struct loc_network_list* list) { | |
96 | return list->size == 0; | |
97 | } | |
98 | ||
99 | LOC_EXPORT void loc_network_list_clear(struct loc_network_list* list) { | |
248f5e04 MT |
100 | if (!list->elements) |
101 | return; | |
102 | ||
e0b9ff5f | 103 | for (unsigned int i = 0; i < list->size; i++) |
3b44e421 | 104 | loc_network_unref(list->elements[i]); |
e0b9ff5f | 105 | |
248f5e04 MT |
106 | free(list->elements); |
107 | list->elements_size = 0; | |
108 | ||
e0b9ff5f MT |
109 | list->size = 0; |
110 | } | |
111 | ||
112 | LOC_EXPORT void loc_network_list_dump(struct loc_network_list* list) { | |
113 | struct loc_network* network; | |
114 | char* s; | |
115 | ||
116 | for (unsigned int i = 0; i < list->size; i++) { | |
3b44e421 | 117 | network = list->elements[i]; |
e0b9ff5f MT |
118 | |
119 | s = loc_network_str(network); | |
120 | ||
121 | INFO(list->ctx, "%s\n", s); | |
122 | free(s); | |
123 | } | |
124 | } | |
125 | ||
126 | LOC_EXPORT struct loc_network* loc_network_list_get(struct loc_network_list* list, size_t index) { | |
127 | // Check index | |
128 | if (index >= list->size) | |
129 | return NULL; | |
130 | ||
3b44e421 | 131 | return loc_network_ref(list->elements[index]); |
e0b9ff5f MT |
132 | } |
133 | ||
af4689bf MT |
134 | //MOVE FUNCTION GOES HERE |
135 | ||
136 | static off_t loc_network_list_find(struct loc_network_list* list, | |
137 | struct loc_network* network, int* found) { | |
138 | off_t lo = 0; | |
139 | off_t hi = list->size - 1; | |
140 | ||
141 | *found = 0; | |
142 | ||
143 | #ifdef ENABLE_DEBUG | |
144 | // Save start time | |
145 | clock_t start = clock(); | |
146 | #endif | |
147 | ||
148 | off_t i = 0; | |
149 | ||
150 | while (lo <= hi) { | |
151 | i = (lo + hi) / 2; | |
152 | ||
153 | // Check if this is a match | |
154 | int result = loc_network_cmp(network, list->elements[i]); | |
155 | ||
156 | if (result == 0) { | |
157 | *found = 1; | |
158 | ||
159 | #ifdef ENABLE_DEBUG | |
160 | clock_t end = clock(); | |
161 | ||
162 | // Log how fast this has been | |
163 | DEBUG(list->ctx, "Found network in %.4fms at %jd\n", | |
164 | (double)(end - start) / CLOCKS_PER_SEC * 1000, (intmax_t)i); | |
165 | #endif | |
166 | ||
167 | return i; | |
168 | } | |
169 | ||
170 | if (result > 0) | |
171 | lo = i + 1; | |
172 | else | |
173 | hi = i - 1; | |
174 | } | |
175 | ||
176 | #ifdef ENABLE_DEBUG | |
177 | clock_t end = clock(); | |
178 | ||
179 | // Log how fast this has been | |
180 | DEBUG(list->ctx, "Did not find network in %.4fms (last i = %jd)\n", | |
181 | (double)(end - start) / CLOCKS_PER_SEC * 1000, (intmax_t)i); | |
182 | #endif | |
183 | ||
184 | return i; | |
185 | } | |
186 | ||
e0b9ff5f | 187 | LOC_EXPORT int loc_network_list_push(struct loc_network_list* list, struct loc_network* network) { |
af4689bf MT |
188 | int found = 0; |
189 | ||
190 | off_t index = loc_network_list_find(list, network, &found); | |
191 | ||
192 | // The network has been found on the list. Nothing to do. | |
193 | if (found) | |
e0b9ff5f MT |
194 | return 0; |
195 | ||
af4689bf MT |
196 | DEBUG(list->ctx, "%p: Inserting network %p at index %jd\n", |
197 | list, network, (intmax_t)index); | |
198 | ||
e0b9ff5f | 199 | // Check if we have space left |
3b44e421 MT |
200 | if (list->size >= list->elements_size) { |
201 | int r = loc_network_list_grow(list, 64); | |
202 | if (r) | |
203 | return r; | |
e0b9ff5f MT |
204 | } |
205 | ||
af4689bf MT |
206 | // The list is now larger |
207 | list->size++; | |
208 | ||
209 | // Move all elements out of the way | |
210 | for (unsigned int i = list->size - 1; i > index; i--) | |
211 | list->elements[i] = list->elements[i - 1]; | |
e0b9ff5f | 212 | |
af4689bf MT |
213 | // Add the new element at the right place |
214 | list->elements[index] = loc_network_ref(network); | |
e0b9ff5f MT |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
219 | LOC_EXPORT struct loc_network* loc_network_list_pop(struct loc_network_list* list) { | |
220 | // Return nothing when empty | |
221 | if (loc_network_list_empty(list)) { | |
222 | DEBUG(list->ctx, "%p: Popped empty stack\n", list); | |
223 | return NULL; | |
224 | } | |
225 | ||
3b44e421 | 226 | struct loc_network* network = list->elements[--list->size]; |
e0b9ff5f MT |
227 | |
228 | DEBUG(list->ctx, "%p: Popping network %p from stack\n", list, network); | |
229 | ||
230 | return network; | |
231 | } | |
232 | ||
233 | LOC_EXPORT struct loc_network* loc_network_list_pop_first(struct loc_network_list* list) { | |
234 | // Return nothing when empty | |
235 | if (loc_network_list_empty(list)) { | |
236 | DEBUG(list->ctx, "%p: Popped empty stack\n", list); | |
237 | return NULL; | |
238 | } | |
239 | ||
3b44e421 | 240 | struct loc_network* network = list->elements[0]; |
e0b9ff5f MT |
241 | |
242 | // Move all elements to the top of the stack | |
243 | for (unsigned int i = 0; i < --list->size; i++) { | |
3b44e421 | 244 | list->elements[i] = list->elements[i+1]; |
e0b9ff5f MT |
245 | } |
246 | ||
247 | DEBUG(list->ctx, "%p: Popping network %p from stack\n", list, network); | |
248 | ||
249 | return network; | |
250 | } | |
251 | ||
252 | LOC_EXPORT int loc_network_list_contains(struct loc_network_list* list, struct loc_network* network) { | |
af4689bf | 253 | int found = 0; |
e0b9ff5f | 254 | |
af4689bf MT |
255 | loc_network_list_find(list, network, &found); |
256 | ||
257 | return found; | |
e0b9ff5f MT |
258 | } |
259 | ||
e0b9ff5f MT |
260 | LOC_EXPORT int loc_network_list_merge( |
261 | struct loc_network_list* self, struct loc_network_list* other) { | |
262 | int r; | |
263 | ||
264 | for (unsigned int i = 0; i < other->size; i++) { | |
3b44e421 | 265 | r = loc_network_list_push(self, other->elements[i]); |
e0b9ff5f MT |
266 | if (r) |
267 | return r; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | } |