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1 /*
2 * Copyright (C) 2007, Jason Kivlighn <jkivlighn@gmail.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #include "config.h"
21
22 #ifndef _GNU_SOURCE
23 #define _GNU_SOURCE
24 #endif
25
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <string.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <unistd.h>
32 #include <sys/mman.h>
33
34 #include <glib.h>
35 #include <glib/gstdio.h>
36
37 #include <gio/gio.h>
38
39 #include <libtracker-common/tracker-file-utils.h>
40
41 #include <libtracker-extract/tracker-extract.h>
42
43 /* This function is used to find the URI for a file.xmp file. The point here is
44 * that the URI for file.xmp is not file:///file.xmp but instead for example
45 * file:///file.jpeg or file:///file.png. The reason is that file.xmp is a
46 * sidekick, and a sidekick doesn't describe itself, it describes another file. */
47
48 static gchar *
49 find_orig_uri (const gchar *xmp_filename)
50 {
51 GFile *file;
52 GFile *dir;
53 GFileEnumerator *iter;
54 GFileInfo *orig_info;
55 const gchar *filename_a;
56 gchar *found_file = NULL;
57
58 file = g_file_new_for_path (xmp_filename);
59 dir = g_file_get_parent (file);
60
61 orig_info = g_file_query_info (file, G_FILE_ATTRIBUTE_STANDARD_NAME,
62 G_FILE_QUERY_INFO_NONE,
63 NULL, NULL);
64
65 filename_a = g_file_info_get_name (orig_info);
66
67 iter = g_file_enumerate_children (dir, G_FILE_ATTRIBUTE_STANDARD_NAME,
68 G_FILE_QUERY_INFO_NONE,
69 NULL, NULL);
70
71 if (iter) {
72 GFileInfo *info;
73
74 while ((info = g_file_enumerator_next_file (iter, NULL, NULL)) && !found_file) {
75 const gchar *filename_b;
76 const gchar *ext_a, *ext_b;
77 gchar *casefold_a, *casefold_b;
78
79 /* OK, important:
80 * 1. Files can't be the same.
81 * 2. File names (without extension) must match
82 * 3. Something else? */
83
84 filename_b = g_file_info_get_name (info);
85
86 ext_a = g_utf8_strrchr (filename_a, -1, '.');
87 ext_b = g_utf8_strrchr (filename_b, -1, '.');
88
89 /* Look for extension */
90 if (!ext_a || !ext_b) {
91 g_object_unref (info);
92 continue;
93 }
94
95 /* Name part is the same length */
96 if ((ext_a - filename_a) != (ext_b - filename_b)) {
97 g_object_unref (info);
98 continue;
99 }
100
101 /* Check extensions are not the same (i.e. same len and ext) */
102 if (g_strcmp0 (ext_a, ext_b) == 0) {
103 g_object_unref (info);
104 continue;
105 }
106
107 /* Don't compare the ".xmp" with ".jpeg" and don't match the same file */
108
109 /* Now compare name (without ext) and make
110 * sure they are the same in a caseless
111 * compare. */
112
113 casefold_a = g_utf8_casefold (filename_a, (ext_a - filename_a));
114 casefold_b = g_utf8_casefold (filename_b, (ext_b - filename_b));
115
116 if (g_strcmp0 (casefold_a, casefold_b) == 0) {
117 GFile *found;
118
119 found = g_file_get_child (dir, filename_b);
120 found_file = g_file_get_uri (found);
121 g_object_unref (found);
122 }
123
124 g_free (casefold_a);
125 g_free (casefold_b);
126 g_object_unref (info);
127 }
128
129 g_object_unref (iter);
130 }
131
132 g_object_unref (orig_info);
133 g_object_unref (file);
134 g_object_unref (dir);
135
136 return found_file;
137 }
138
139 G_MODULE_EXPORT gboolean
140 tracker_extract_get_metadata (TrackerExtractInfo *info)
141 {
142 TrackerSparqlBuilder *metadata, *preupdate;
143 TrackerXmpData *xd = NULL;
144 gchar *filename, *uri;
145 gchar *contents;
146 gsize length = 0;
147 GFile *file;
148 const gchar *graph;
149 int fd;
150 struct stat st;
151
152 file = tracker_extract_info_get_file (info);
153 filename = g_file_get_path (file);
154
155 graph = tracker_extract_info_get_graph (info);
156 preupdate = tracker_extract_info_get_preupdate_builder (info);
157 metadata = tracker_extract_info_get_metadata_builder (info);
158
159 fd = tracker_file_open_fd (filename);
160
161 if (fd == -1) {
162 g_warning ("Could not open xmp file '%s': %s\n",
163 filename,
164 g_strerror (errno));
165 g_free (filename);
166 return FALSE;
167 }
168
169 if (fstat (fd, &st) == -1) {
170 g_warning ("Could not fstat xmp file '%s': %s\n",
171 filename,
172 g_strerror (errno));
173 close (fd);
174 g_free (filename);
175 return FALSE;
176 }
177
178 if (st.st_size == 0) {
179 contents = NULL;
180 length = 0;
181 } else {
182 contents = (gchar *) mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
183 if (contents == NULL) {
184 g_warning ("Could not mmap xmp file '%s': %s\n",
185 filename,
186 g_strerror (errno));
187 close (fd);
188 g_free (filename);
189 return FALSE;
190 }
191 length = st.st_size;
192 }
193
194 uri = g_file_get_uri (file);
195
196 if (contents) {
197 gchar *original_uri;
198
199 original_uri = find_orig_uri (filename);
200
201 /* If no orig file is found for the sidekick, we use the sidekick to
202 * describe itself instead, falling back to uri
203 */
204 xd = tracker_xmp_new (contents,
205 length,
206 original_uri ? original_uri : uri);
207
208 if (xd) {
209 GString *where;
210
211 where = g_string_new ("");
212 tracker_xmp_apply (preupdate, metadata, graph, where, uri, xd);
213 tracker_extract_info_set_where_clause (info, where->str);
214 g_string_free (where, TRUE);
215 }
216
217 g_free (original_uri);
218 tracker_xmp_free (xd);
219 g_free (filename);
220 g_free (uri);
221
222 munmap (contents, length);
223
224 close (fd);
225
226 return TRUE;
227 }
228
229 close (fd);
230 g_free (filename);
231 g_free (uri);
232
233 return FALSE;
234 }