1 /* exif-mnote-data-canon.c
3 * Copyright (c) 2002, 2003 Lutz Mueller <lutz@users.sourceforge.net>
4 * Copyright (c) 2003 Matthieu Castet <mat-c@users.sourceforge.net>
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 of the License, or (at your option) any later version.
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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 #include "exif-mnote-data-canon.h"
29 #include <libexif/exif-byte-order.h>
30 #include <libexif/exif-utils.h>
31 #include <libexif/exif-data.h>
36 exif_mnote_data_canon_clear (ExifMnoteDataCanon *n)
38 ExifMnoteData *d = (ExifMnoteData *) n;
44 for (i = 0; i < n->count; i++)
45 if (n->entries[i].data) {
46 exif_mem_free (d->mem, n->entries[i].data);
47 n->entries[i].data = NULL;
49 exif_mem_free (d->mem, n->entries);
56 exif_mnote_data_canon_free (ExifMnoteData *n)
60 exif_mnote_data_canon_clear ((ExifMnoteDataCanon *) n);
64 exif_mnote_data_canon_get_tags (ExifMnoteDataCanon *dc, unsigned int n,
65 unsigned int *m, unsigned int *s)
67 unsigned int from = 0, to;
69 if (!dc || !m) return;
70 for (*m = 0; *m < dc->count; (*m)++) {
71 to = from + mnote_canon_entry_count_values (&dc->entries[*m]);
81 exif_mnote_data_canon_get_value (ExifMnoteData *note, unsigned int n, char *val, unsigned int maxlen)
83 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note;
87 exif_mnote_data_canon_get_tags (dc, n, &m, &s);
88 if (m >= dc->count) return NULL;
89 return mnote_canon_entry_get_value (&dc->entries[m], s, val, maxlen);
93 exif_mnote_data_canon_set_byte_order (ExifMnoteData *d, ExifByteOrder o)
96 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) d;
103 for (i = 0; i < n->count; i++) {
104 n->entries[i].order = o;
105 exif_array_set_byte_order (n->entries[i].format, n->entries[i].data,
106 n->entries[i].components, o_orig, o);
111 exif_mnote_data_canon_set_offset (ExifMnoteData *n, unsigned int o)
113 if (n) ((ExifMnoteDataCanon *) n)->offset = o;
117 exif_mnote_data_canon_save (ExifMnoteData *ne,
118 unsigned char **buf, unsigned int *buf_size)
120 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne;
121 size_t i, o, s, doff;
125 if (!n || !buf || !buf_size) return;
128 * Allocate enough memory for all entries and the number
131 *buf_size = 2 + n->count * 12 + 4;
132 *buf = exif_mem_alloc (ne->mem, sizeof (char) * *buf_size);
135 /* Save the number of entries */
136 exif_set_short (*buf, n->order, (ExifShort) n->count);
138 /* Save each entry */
139 for (i = 0; i < n->count; i++) {
141 exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i].tag);
142 exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i].format);
143 exif_set_long (*buf + o + 4, n->order,
144 n->entries[i].components);
146 s = exif_format_get_size (n->entries[i].format) *
147 n->entries[i].components;
149 /* Corrupt data: EXIF data size is limited to the
150 * maximum size of a JPEG segment (64 kb).
157 /* Ensure even offsets. Set padding bytes to 0. */
159 t = exif_mem_realloc (ne->mem, *buf,
164 doff = *buf_size - s;
165 if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; }
166 exif_set_long (*buf + o, n->order, n->offset + doff);
171 * Write the data. Fill unneeded bytes with 0. Do not
172 * crash if data is NULL.
174 if (!n->entries[i].data) memset (*buf + doff, 0, s);
175 else memcpy (*buf + doff, n->entries[i].data, s);
176 if (s < 4) memset (*buf + doff + s, 0, (4 - s));
181 * FIXME: exif_mnote_data_canon_load() may fail and there is no
182 * semantics to express that.
183 * See bug #1054323 for details, especially the comment by liblit
184 * after it has supposedly been fixed:
186 * https://sourceforge.net/tracker/?func=detail&aid=1054323&group_id=12272&atid=112272
187 * Unfortunately, the "return" statements aren't commented at
188 * all, so it isn't trivial to find out what is a normal
189 * return, and what is a reaction to an error condition.
193 exif_mnote_data_canon_load (ExifMnoteData *ne,
194 const unsigned char *buf, unsigned int buf_size)
196 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne;
201 if (!n || !buf || !buf_size || (buf_size < 6 + n->offset + 2)) return;
203 /* Read the number of entries and remove old ones. */
204 c = exif_get_short (buf + 6 + n->offset, n->order);
205 exif_mnote_data_canon_clear (n);
207 /* Parse the entries */
208 for (i = 0; i < c; i++) {
209 o = 6 + 2 + n->offset + 12 * i;
210 if (o + 8 > buf_size) return;
212 t = exif_mem_realloc (ne->mem, n->entries,
213 sizeof (MnoteCanonEntry) * (i + 1));
217 memset (&n->entries[i], 0, sizeof (MnoteCanonEntry));
218 n->entries[i].tag = exif_get_short (buf + o, n->order);
219 n->entries[i].format = exif_get_short (buf + o + 2, n->order);
220 n->entries[i].components = exif_get_long (buf + o + 4, n->order);
221 n->entries[i].order = n->order;
224 * Size? If bigger than 4 bytes, the actual data is not
225 * in the entry but somewhere else (offset).
227 s = exif_format_get_size (n->entries[i].format) * n->entries[i].components;
230 if (s > 4) o = exif_get_long (buf + o, n->order) + 6;
231 if (o + s > buf_size) return;
234 n->entries[i].data = exif_mem_alloc (ne->mem, sizeof (char) * s);
235 if (!n->entries[i].data) return;
236 n->entries[i].size = s;
237 memcpy (n->entries[i].data, buf + o, s);
242 exif_mnote_data_canon_count (ExifMnoteData *n)
244 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) n;
247 for (i = c = 0; dc && (i < dc->count); i++)
248 c += mnote_canon_entry_count_values (&dc->entries[i]);
253 exif_mnote_data_canon_get_id (ExifMnoteData *d, unsigned int i)
255 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) d;
259 exif_mnote_data_canon_get_tags (dc, i, &m, NULL);
260 if (m >= dc->count) return 0;
261 return dc->entries[m].tag;
265 exif_mnote_data_canon_get_name (ExifMnoteData *note, unsigned int i)
267 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note;
270 if (!dc) return NULL;
271 exif_mnote_data_canon_get_tags (dc, i, &m, &s);
272 if (m >= dc->count) return NULL;
273 return mnote_canon_tag_get_name_sub (dc->entries[m].tag, s, dc->options);
277 exif_mnote_data_canon_get_title (ExifMnoteData *note, unsigned int i)
279 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note;
282 if (!dc) return NULL;
283 exif_mnote_data_canon_get_tags (dc, i, &m, &s);
284 if (m >= dc->count) return NULL;
285 return mnote_canon_tag_get_title_sub (dc->entries[m].tag, s, dc->options);
289 exif_mnote_data_canon_get_description (ExifMnoteData *note, unsigned int i)
291 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note;
294 if (!dc) return NULL;
295 exif_mnote_data_canon_get_tags (dc, i, &m, NULL);
296 if (m >= dc->count) return NULL;
297 return mnote_canon_tag_get_description (dc->entries[m].tag);
301 exif_mnote_data_canon_new (ExifMem *mem, ExifDataOption o)
304 ExifMnoteDataCanon *dc;
306 if (!mem) return NULL;
308 d = exif_mem_alloc (mem, sizeof (ExifMnoteDataCanon));
311 exif_mnote_data_construct (d, mem);
313 /* Set up function pointers */
314 d->methods.free = exif_mnote_data_canon_free;
315 d->methods.set_byte_order = exif_mnote_data_canon_set_byte_order;
316 d->methods.set_offset = exif_mnote_data_canon_set_offset;
317 d->methods.load = exif_mnote_data_canon_load;
318 d->methods.save = exif_mnote_data_canon_save;
319 d->methods.count = exif_mnote_data_canon_count;
320 d->methods.get_id = exif_mnote_data_canon_get_id;
321 d->methods.get_name = exif_mnote_data_canon_get_name;
322 d->methods.get_title = exif_mnote_data_canon_get_title;
323 d->methods.get_description = exif_mnote_data_canon_get_description;
324 d->methods.get_value = exif_mnote_data_canon_get_value;
326 dc = (ExifMnoteDataCanon*)d;