MediaScanner.cpp revision 3e9f9f1596d4225ddd9288b4f7b24a15221374dc 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "MediaScanner"
19#include <utils/Log.h>
20
21#include <media/mediascanner.h>
22
23#include <sys/stat.h>
24#include <dirent.h>
25
26namespace android {
27
28MediaScanner::MediaScanner()
29    : mLocale(NULL) {
30}
31
32MediaScanner::~MediaScanner() {
33    setLocale(NULL);
34}
35
36void MediaScanner::setLocale(const char *locale) {
37    if (mLocale) {
38        free(mLocale);
39        mLocale = NULL;
40    }
41    if (locale) {
42        mLocale = strdup(locale);
43    }
44}
45
46const char *MediaScanner::locale() const {
47    return mLocale;
48}
49
50status_t MediaScanner::processDirectory(
51        const char *path, MediaScannerClient &client,
52        ExceptionCheck exceptionCheck, void *exceptionEnv) {
53    int pathLength = strlen(path);
54    if (pathLength >= PATH_MAX) {
55        return UNKNOWN_ERROR;
56    }
57    char* pathBuffer = (char *)malloc(PATH_MAX + 1);
58    if (!pathBuffer) {
59        return UNKNOWN_ERROR;
60    }
61
62    int pathRemaining = PATH_MAX - pathLength;
63    strcpy(pathBuffer, path);
64    if (pathLength > 0 && pathBuffer[pathLength - 1] != '/') {
65        pathBuffer[pathLength] = '/';
66        pathBuffer[pathLength + 1] = 0;
67        --pathRemaining;
68    }
69
70    client.setLocale(locale());
71
72    status_t result =
73        doProcessDirectory(
74                pathBuffer, pathRemaining, client, exceptionCheck, exceptionEnv);
75
76    free(pathBuffer);
77
78    return result;
79}
80
81status_t MediaScanner::doProcessDirectory(
82        char *path, int pathRemaining, MediaScannerClient &client,
83        ExceptionCheck exceptionCheck, void *exceptionEnv) {
84    // place to copy file or directory name
85    char* fileSpot = path + strlen(path);
86    struct dirent* entry;
87    struct stat statbuf;
88
89    // ignore directories that contain a  ".nomedia" file
90    if (pathRemaining >= 8 /* strlen(".nomedia") */ ) {
91        strcpy(fileSpot, ".nomedia");
92        if (access(path, F_OK) == 0) {
93            LOGD("found .nomedia, skipping directory\n");
94            fileSpot[0] = 0;
95            client.addNoMediaFolder(path);
96            return OK;
97        }
98
99        // restore path
100        fileSpot[0] = 0;
101    }
102
103    DIR* dir = opendir(path);
104    if (!dir) {
105        LOGD("opendir %s failed, errno: %d", path, errno);
106        return UNKNOWN_ERROR;
107    }
108
109    while ((entry = readdir(dir))) {
110        const char* name = entry->d_name;
111
112        // ignore "." and ".."
113        if (name[0] == '.' && (name[1] == 0 || (name[1] == '.' && name[2] == 0))) {
114            continue;
115        }
116
117        int nameLength = strlen(name);
118        if (nameLength + 1 > pathRemaining) {
119            // path too long!
120            continue;
121        }
122        strcpy(fileSpot, name);
123
124        int type = entry->d_type;
125        if (type == DT_UNKNOWN) {
126            // If the type is unknown, stat() the file instead.
127            // This is sometimes necessary when accessing NFS mounted filesystems, but
128            // could be needed in other cases well.
129            if (stat(path, &statbuf) == 0) {
130                if (S_ISREG(statbuf.st_mode)) {
131                    type = DT_REG;
132                } else if (S_ISDIR(statbuf.st_mode)) {
133                    type = DT_DIR;
134                }
135            } else {
136                LOGD("stat() failed for %s: %s", path, strerror(errno) );
137            }
138        }
139        if (type == DT_REG || type == DT_DIR) {
140            if (type == DT_DIR) {
141                // ignore directories with a name that starts with '.'
142                // for example, the Mac ".Trashes" directory
143                if (name[0] == '.') continue;
144
145                // report the directory to the client
146                if (stat(path, &statbuf) == 0) {
147                    client.scanFile(path, statbuf.st_mtime, 0, true);
148                }
149
150                // and now process its contents
151                strcat(fileSpot, "/");
152                int err = doProcessDirectory(path, pathRemaining - nameLength - 1, client,
153                        exceptionCheck, exceptionEnv);
154                if (err) {
155                    // pass exceptions up - ignore other errors
156                    if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure;
157                    LOGE("Error processing '%s' - skipping\n", path);
158                    continue;
159                }
160            } else {
161                stat(path, &statbuf);
162                client.scanFile(path, statbuf.st_mtime, statbuf.st_size, false);
163                if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure;
164            }
165        }
166    }
167
168    closedir(dir);
169    return OK;
170failure:
171    closedir(dir);
172    return -1;
173}
174
175}  // namespace android
176