Commit | Line | Data |
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faa9b3e7 TC |
1 | /* |
2 | =head1 NAME | |
3 | ||
4 | tags.c - functions for manipulating an images tags list | |
5 | ||
6 | =head1 SYNOPSIS | |
7 | ||
8 | i_img_tags tags; | |
9 | i_tags_new(&tags); | |
10 | i_tags_destroy(&tags); | |
11 | i_tags_addn(&tags, "name", code, idata); | |
12 | i_tags_add(&tags, "name", code, data, data_size, idata); | |
13 | if (i_tags_find(&tags, name, start, &entry)) { found } | |
14 | if (i_tags_findn(&tags, code, start, &entry)) { found } | |
15 | i_tags_delete(&tags, index); | |
16 | count = i_tags_delbyname(tags, name); | |
17 | count = i_tags_delbycode(tags, code); | |
18 | ||
19 | =head1 DESCRIPTION | |
20 | ||
21 | Provides functions which give write access to the tags list of an image. | |
22 | ||
23 | For read access directly access the fields (do not write any fields | |
24 | directly). | |
25 | ||
26 | A tag is represented by an i_img_tag structure: | |
27 | ||
28 | typedef enum { | |
29 | itt_double, | |
30 | iit_text | |
31 | } i_tag_type; | |
32 | ||
33 | typedef struct { | |
34 | char *name; // name of a given tag, might be NULL | |
35 | int code; // number of a given tag, -1 if it has no meaning | |
36 | char *data; // value of a given tag if it's not an int, may be NULL | |
37 | int size; // size of the data | |
38 | int idata; // value of a given tag if data is NULL | |
39 | } i_img_tag; | |
40 | ||
41 | ||
42 | =over | |
43 | ||
44 | =cut | |
45 | */ | |
46 | ||
47 | #include "image.h" | |
48 | #include <string.h> | |
49 | #include <stdlib.h> | |
50 | ||
51 | /* useful for debugging */ | |
52 | void i_tags_print(i_img_tags *tags); | |
53 | ||
54 | /* | |
55 | =item i_tags_new(i_img_tags *tags) | |
56 | ||
57 | Initialize a tags structure. Should not be used if the tags structure | |
58 | has been previously used. | |
59 | ||
60 | To destroy the contents use i_tags_destroy() | |
61 | ||
62 | =cut | |
63 | */ | |
64 | ||
65 | void i_tags_new(i_img_tags *tags) { | |
66 | tags->count = tags->alloc = 0; | |
67 | tags->tags = NULL; | |
68 | } | |
69 | ||
70 | /* | |
71 | =item i_tags_addn(i_img_tags *tags, char *name, int code, int idata) | |
72 | ||
73 | Adds a tag that has an integer value. A simple wrapper around i_tags_add(). | |
74 | ||
75 | Duplicate tags can be added. | |
76 | ||
77 | Returns non-zero on success. | |
78 | ||
79 | =cut | |
80 | */ | |
81 | ||
82 | int i_tags_addn(i_img_tags *tags, char *name, int code, int idata) { | |
83 | return i_tags_add(tags, name, code, NULL, 0, idata); | |
84 | } | |
85 | ||
86 | /* | |
87 | =item i_tags_add(i_img_tags *tags, char *name, int code, char *data, int size, i_tag_type type, int idata) | |
88 | ||
89 | Adds a tag to the tags list. | |
90 | ||
91 | Duplicate tags can be added. | |
92 | ||
93 | Returns non-zero on success. | |
94 | ||
95 | =cut | |
96 | */ | |
97 | ||
98 | int i_tags_add(i_img_tags *tags, char *name, int code, char *data, int size, | |
99 | int idata) { | |
100 | i_img_tag work = {0}; | |
101 | if (tags->tags == NULL) { | |
102 | int alloc = 10; | |
103 | tags->tags = malloc(sizeof(i_img_tag) * alloc); | |
104 | if (!tags->tags) | |
105 | return 0; | |
106 | tags->alloc = alloc; | |
107 | } | |
108 | else if (tags->count == tags->alloc) { | |
109 | int newalloc = tags->alloc + 10; | |
110 | void *newtags = realloc(tags->tags, sizeof(i_img_tag) * newalloc); | |
111 | if (!newtags) { | |
112 | return 0; | |
113 | } | |
114 | tags->tags = newtags; | |
115 | tags->alloc = newalloc; | |
116 | } | |
117 | if (name) { | |
118 | work.name = malloc(strlen(name)+1); | |
119 | if (!work.name) | |
120 | return 0; | |
121 | strcpy(work.name, name); | |
122 | } | |
123 | if (data) { | |
124 | work.data = malloc(size+1); | |
125 | if (!work.data) { | |
126 | if (work.name) free(work.name); | |
127 | return 0; | |
128 | } | |
129 | memcpy(work.data, data, size); | |
130 | work.data[size] = '\0'; /* convenience */ | |
131 | work.size = size; | |
132 | } | |
133 | work.code = code; | |
134 | work.idata = idata; | |
135 | tags->tags[tags->count++] = work; | |
136 | ||
137 | return 1; | |
138 | } | |
139 | ||
140 | void i_tags_destroy(i_img_tags *tags) { | |
141 | if (tags->tags) { | |
142 | int i; | |
143 | for (i = 0; i < tags->count; ++i) { | |
144 | if (tags->tags[i].name) | |
145 | free(tags->tags[i].name); | |
146 | if (tags->tags[i].data) | |
147 | free(tags->tags[i].data); | |
148 | } | |
149 | free(tags->tags); | |
150 | } | |
151 | } | |
152 | ||
153 | int i_tags_find(i_img_tags *tags, char *name, int start, int *entry) { | |
154 | if (tags->tags) { | |
155 | while (start < tags->count) { | |
156 | if (tags->tags[start].name && strcmp(name, tags->tags[start].name) == 0) { | |
157 | *entry = start; | |
158 | return 1; | |
159 | } | |
160 | ++start; | |
161 | } | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | int i_tags_findn(i_img_tags *tags, int code, int start, int *entry) { | |
167 | if (tags->tags) { | |
168 | while (start < tags->count) { | |
169 | if (tags->tags[start].code == code) { | |
170 | *entry = start; | |
171 | return 1; | |
172 | } | |
173 | ++start; | |
174 | } | |
175 | } | |
176 | return 0; | |
177 | } | |
178 | ||
179 | int i_tags_delete(i_img_tags *tags, int entry) { | |
180 | if (tags->tags && entry >= 0 && entry < tags->count) { | |
181 | i_img_tag old = tags->tags[entry]; | |
182 | memmove(tags->tags+entry, tags->tags+entry+1, | |
183 | tags->count-entry-1); | |
184 | if (old.name) | |
185 | free(old.name); | |
186 | if (old.data) | |
187 | free(old.data); | |
188 | --tags->count; | |
189 | return 1; | |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
194 | int i_tags_delbyname(i_img_tags *tags, char *name) { | |
195 | int count = 0; | |
196 | int i; | |
197 | if (tags->tags) { | |
198 | for (i = tags->count-1; i >= 0; --i) { | |
199 | if (tags->tags[i].name && strcmp(name, tags->tags[i].name) == 0) { | |
200 | ++count; | |
201 | i_tags_delete(tags, i); | |
202 | } | |
203 | } | |
204 | } | |
205 | return count; | |
206 | } | |
207 | ||
208 | int i_tags_delbycode(i_img_tags *tags, int code) { | |
209 | int count = 0; | |
210 | int i; | |
211 | if (tags->tags) { | |
212 | for (i = tags->count-1; i >= 0; --i) { | |
213 | if (tags->tags[i].code == code) { | |
214 | ++count; | |
215 | i_tags_delete(tags, i); | |
216 | } | |
217 | } | |
218 | } | |
219 | return count; | |
220 | } | |
221 | ||
222 | int i_tags_get_float(i_img_tags *tags, char *name, int code, double *value) { | |
223 | int index; | |
224 | i_img_tag *entry; | |
225 | ||
226 | if (name) { | |
227 | if (!i_tags_find(tags, name, 0, &index)) | |
228 | return 0; | |
229 | } | |
230 | else { | |
231 | if (!i_tags_findn(tags, code, 0, &index)) | |
232 | return 0; | |
233 | } | |
234 | entry = tags->tags+index; | |
235 | if (entry->data) | |
236 | *value = atof(entry->data); | |
237 | else | |
238 | *value = entry->idata; | |
239 | ||
240 | return 1; | |
241 | } | |
242 | ||
243 | int i_tags_set_float(i_img_tags *tags, char *name, int code, double value) { | |
244 | char temp[40]; | |
245 | ||
246 | sprintf(temp, "%.30g", value); | |
247 | if (name) | |
248 | i_tags_delbyname(tags, name); | |
249 | else | |
250 | i_tags_delbycode(tags, code); | |
251 | ||
252 | return i_tags_add(tags, name, code, temp, strlen(temp), 0); | |
253 | } | |
254 | ||
255 | int i_tags_get_int(i_img_tags *tags, char *name, int code, int *value) { | |
256 | int index; | |
257 | i_img_tag *entry; | |
258 | ||
259 | if (name) { | |
260 | if (!i_tags_find(tags, name, 0, &index)) | |
261 | return 0; | |
262 | } | |
263 | else { | |
264 | if (!i_tags_findn(tags, code, 0, &index)) | |
265 | return 0; | |
266 | } | |
267 | entry = tags->tags+index; | |
268 | if (entry->data) | |
269 | *value = atoi(entry->data); | |
270 | else | |
271 | *value = entry->idata; | |
272 | ||
273 | return 1; | |
274 | } | |
275 | ||
276 | int i_tags_get_string(i_img_tags *tags, char *name, int code, | |
277 | char *value, size_t value_size) { | |
278 | int index; | |
279 | i_img_tag *entry; | |
280 | ||
281 | if (name) { | |
282 | if (!i_tags_find(tags, name, 0, &index)) | |
283 | return 0; | |
284 | } | |
285 | else { | |
286 | if (!i_tags_findn(tags, code, 0, &index)) | |
287 | return 0; | |
288 | } | |
289 | entry = tags->tags+index; | |
290 | if (entry->data) { | |
291 | size_t cpsize = value_size < entry->size ? value_size : entry->size; | |
292 | memcpy(value, entry->data, cpsize); | |
293 | if (cpsize == value_size) | |
294 | --cpsize; | |
295 | value[cpsize] = '\0'; | |
296 | } | |
297 | else { | |
298 | sprintf(value, "%d", entry->data); | |
299 | } | |
300 | ||
301 | return 1; | |
302 | } | |
303 | ||
304 | void i_tags_print(i_img_tags *tags) { | |
305 | int i; | |
306 | printf("Alloc %d\n", tags->alloc); | |
307 | printf("Count %d\n", tags->count); | |
308 | for (i = 0; i < tags->count; ++i) { | |
309 | i_img_tag *tag = tags->tags + i; | |
310 | printf("Tag %d\n", i); | |
311 | if (tag->name) | |
312 | printf(" Name : %s\n", tag->name); | |
313 | printf(" Code : %d\n", tag->code); | |
314 | if (tag->data) { | |
315 | int pos; | |
316 | printf(" Data : %d => '", tag->size); | |
317 | for (pos = 0; pos < tag->size; ++pos) { | |
318 | if (tag->data[pos] == '\\' || tag->data[pos] == '\'') { | |
319 | putchar('\\'); | |
320 | putchar(tag->data[pos]); | |
321 | } | |
322 | else if (tag->data[pos] < ' ' || tag->data[pos] >= '\x7E') | |
323 | printf("\\x%02X", tag->data[pos]); | |
324 | else | |
325 | putchar(tag->data[pos]); | |
326 | } | |
327 | printf("'\n"); | |
328 | printf(" Idata: %d\n", tag->idata); | |
329 | } | |
330 | } | |
331 | } | |
b8c2033e AMH |
332 | |
333 | /* | |
334 | =back | |
335 | ||
336 | =head1 AUTHOR | |
337 | ||
338 | Tony Cook <tony@develop-help.com> | |
339 | ||
340 | =head1 SEE ALSO | |
341 | ||
342 | Imager(3) | |
343 | ||
344 | =cut | |
345 | */ |