1 /*
2 * Copyright � 2007 Alistair Crooks. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote
13 * products derived from this software without specific prior written
14 * permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
22 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #include <sys/types.h>
29
30 #include <db.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <fuse.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39
40 #include "virtdir.h"
41 #include "defs.h"
42
43 static char *prefix; /* where the music is */
44 static int verbose; /* how chatty are we? */
45
46 static BTREEINFO bt;
47
48 static virtdir_t id3;
49
50
51 /* perform the stat operation */
52 /* if this is the root, then just synthesise the data */
53 /* otherwise, retrieve the data, and be sure to fill in the size */
54 static int
id3fs_getattr(const char * path,struct stat * st)55 id3fs_getattr(const char *path, struct stat *st)
56 {
57 virt_dirent_t *ep;
58
59 if (strcmp(path, "/") == 0) {
60 (void) memset(st, 0x0, sizeof(*st));
61 st->st_mode = S_IFDIR | 0755;
62 st->st_nlink = 2;
63 return 0;
64 }
65 if ((ep = virtdir_find(&id3, path, strlen(path))) == NULL) {
66 return -ENOENT;
67 }
68 switch(ep->type) {
69 case 'f':
70 (void) memcpy(st, &id3.file, sizeof(*st));
71 break;
72 case 'd':
73 (void) memcpy(st, &id3.dir, sizeof(*st));
74 break;
75 case 'l':
76 (void) memcpy(st, &id3.lnk, sizeof(*st));
77 st->st_size = ep->tgtlen;
78 break;
79 }
80 return 0;
81 }
82
83 /* readdir operation */
84 static int
id3fs_readdir(const char * path,void * buf,fuse_fill_dir_t filler,off_t offset,struct fuse_file_info * fi)85 id3fs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
86 off_t offset, struct fuse_file_info * fi)
87 {
88 virt_dirent_t *dp;
89 VIRTDIR *dirp;
90
91 if ((dirp = openvirtdir(&id3, path)) == NULL) {
92 return 0;
93 }
94 filler(buf, ".", NULL, 0);
95 filler(buf, "..", NULL, 0);
96 while ((dp = readvirtdir(dirp)) != NULL) {
97 filler(buf, dp->d_name, NULL, 0);
98 }
99 closevirtdir(dirp);
100 return 0;
101 }
102
103 /* open the file in the file system */
104 static int
id3fs_open(const char * path,struct fuse_file_info * fi)105 id3fs_open(const char *path, struct fuse_file_info * fi)
106 {
107 return 0;
108 }
109
110 /* read the file's contents in the file system */
111 static int
id3fs_read(const char * path,char * buf,size_t size,off_t offset,struct fuse_file_info * fi)112 id3fs_read(const char *path, char *buf, size_t size, off_t offset,
113 struct fuse_file_info * fi)
114 {
115 return 0;
116 }
117
118 /* fill in the statvfs struct */
119 static int
id3fs_statfs(const char * path,struct statvfs * st)120 id3fs_statfs(const char *path, struct statvfs *st)
121 {
122 (void) memset(st, 0x0, sizeof(*st));
123 return 0;
124 }
125
126 /* read the symbolic link */
127 static int
id3fs_readlink(const char * path,char * buf,size_t size)128 id3fs_readlink(const char *path, char *buf, size_t size)
129 {
130 virt_dirent_t *ep;
131
132 if ((ep = virtdir_find(&id3, path, strlen(path))) == NULL) {
133 return -ENOENT;
134 }
135 if (ep->tgt == NULL) {
136 return -ENOENT;
137 }
138 (void) strlcpy(buf, ep->tgt, size);
139 return 0;
140 }
141
142 /* operations struct */
143 static struct fuse_operations id3fs_oper = {
144 .getattr = id3fs_getattr,
145 .readlink = id3fs_readlink,
146 .readdir = id3fs_readdir,
147 .open = id3fs_open,
148 .read = id3fs_read,
149 .statfs = id3fs_statfs
150 };
151
152 /* build up a fuse_tree from the information in the database */
153 static void
build_id3_tree(DB * db,virtdir_t * tp)154 build_id3_tree(DB *db, virtdir_t *tp)
155 {
156 struct stat dir;
157 struct stat f;
158 const char *d;
159 char name[MAXPATHLEN];
160 char *slash;
161 char *key;
162 char *val;
163 int flag;
164 DBT k;
165 DBT v;
166
167 (void) stat(".", &dir);
168 (void) memcpy(&f, &dir, sizeof(f));
169 f.st_mode = S_IFREG | 0644;
170 (void) memset(&k, 0x0, sizeof(k));
171 (void) memset(&v, 0x0, sizeof(v));
172 for (flag = R_FIRST ; (*db->seq)(db, &k, &v, flag) == 0 ; flag = R_NEXT) {
173 key = (char *) k.data;
174 switch (*key) {
175 case 'a':
176 d = "/artists";
177 break;
178 case 'g':
179 d = "/genre";
180 break;
181 case 'y':
182 d = "/year";
183 break;
184 default:
185 continue;
186 }
187 val = (char *) v.data;
188 if ((slash = strrchr(key, '/')) == NULL) {
189 slash = key;
190 }
191 slash += 1;
192 /* add the symbolic link in that directory */
193 (void) snprintf(name, sizeof(name), "%s/%s/%s", d, val, slash);
194 if (!virtdir_find(tp, name, strlen(name))) {
195 virtdir_add(tp, name, strlen(name), 'l', key + 1,
196 strlen(key + 1));
197 }
198 }
199 }
200
201 int
main(int argc,char ** argv)202 main(int argc, char **argv)
203 {
204 char name[MAXPATHLEN];
205 int i;
206 DB *db;
207
208 while ((i = getopt(argc, argv, "p:v")) != -1) {
209 switch(i) {
210 case 'p':
211 prefix = optarg;
212 break;
213 case 'v':
214 verbose = 1;
215 break;
216 }
217 }
218 bt.lorder = 4321;
219 (void) snprintf(name, sizeof(name), "%s/%s", (prefix) ? prefix : "/usr/music", ".id3.db");
220 if ((db = dbopen(name, O_RDONLY, 0666, DB_BTREE, &bt)) == NULL) {
221 warn("null id3 database");
222 }
223 build_id3_tree(db, &id3);
224 return fuse_main(argc, argv, &id3fs_oper, NULL);
225 }
226