MediaScanner.cpp revision 4e2ffa400b82559cab2c5717c8dcdff393d334a9
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, const char *extensions, 52 MediaScannerClient &client, 53 ExceptionCheck exceptionCheck, void *exceptionEnv) { 54 int pathLength = strlen(path); 55 if (pathLength >= PATH_MAX) { 56 return UNKNOWN_ERROR; 57 } 58 char* pathBuffer = (char *)malloc(PATH_MAX + 1); 59 if (!pathBuffer) { 60 return UNKNOWN_ERROR; 61 } 62 63 int pathRemaining = PATH_MAX - pathLength; 64 strcpy(pathBuffer, path); 65 if (pathLength > 0 && pathBuffer[pathLength - 1] != '/') { 66 pathBuffer[pathLength] = '/'; 67 pathBuffer[pathLength + 1] = 0; 68 --pathRemaining; 69 } 70 71 client.setLocale(locale()); 72 73 status_t result = 74 doProcessDirectory( 75 pathBuffer, pathRemaining, extensions, client, 76 exceptionCheck, exceptionEnv); 77 78 free(pathBuffer); 79 80 return result; 81} 82 83static bool fileMatchesExtension(const char* path, const char* extensions) { 84 const char* extension = strrchr(path, '.'); 85 if (!extension) return false; 86 ++extension; // skip the dot 87 if (extension[0] == 0) return false; 88 89 while (extensions[0]) { 90 const char* comma = strchr(extensions, ','); 91 size_t length = (comma ? comma - extensions : strlen(extensions)); 92 if (length == strlen(extension) && strncasecmp(extension, extensions, length) == 0) return true; 93 extensions += length; 94 if (extensions[0] == ',') ++extensions; 95 } 96 97 return false; 98} 99 100status_t MediaScanner::doProcessDirectory( 101 char *path, int pathRemaining, const char *extensions, 102 MediaScannerClient &client, ExceptionCheck exceptionCheck, 103 void *exceptionEnv) { 104 // place to copy file or directory name 105 char* fileSpot = path + strlen(path); 106 struct dirent* entry; 107 108 // ignore directories that contain a ".nomedia" file 109 if (pathRemaining >= 8 /* strlen(".nomedia") */ ) { 110 strcpy(fileSpot, ".nomedia"); 111 if (access(path, F_OK) == 0) { 112 LOGD("found .nomedia, skipping directory\n"); 113 fileSpot[0] = 0; 114 client.addNoMediaFolder(path); 115 return OK; 116 } 117 118 // restore path 119 fileSpot[0] = 0; 120 } 121 122 DIR* dir = opendir(path); 123 if (!dir) { 124 LOGD("opendir %s failed, errno: %d", path, errno); 125 return UNKNOWN_ERROR; 126 } 127 128 while ((entry = readdir(dir))) { 129 const char* name = entry->d_name; 130 131 // ignore "." and ".." 132 if (name[0] == '.' && (name[1] == 0 || (name[1] == '.' && name[2] == 0))) { 133 continue; 134 } 135 136 int nameLength = strlen(name); 137 if (nameLength + 1 > pathRemaining) { 138 // path too long! 139 continue; 140 } 141 strcpy(fileSpot, name); 142 143 int type = entry->d_type; 144 if (type == DT_UNKNOWN) { 145 // If the type is unknown, stat() the file instead. 146 // This is sometimes necessary when accessing NFS mounted filesystems, but 147 // could be needed in other cases well. 148 struct stat statbuf; 149 if (stat(path, &statbuf) == 0) { 150 if (S_ISREG(statbuf.st_mode)) { 151 type = DT_REG; 152 } else if (S_ISDIR(statbuf.st_mode)) { 153 type = DT_DIR; 154 } 155 } else { 156 LOGD("stat() failed for %s: %s", path, strerror(errno) ); 157 } 158 } 159 if (type == DT_REG || type == DT_DIR) { 160 if (type == DT_DIR) { 161 // ignore directories with a name that starts with '.' 162 // for example, the Mac ".Trashes" directory 163 if (name[0] == '.') continue; 164 165 strcat(fileSpot, "/"); 166 int err = doProcessDirectory(path, pathRemaining - nameLength - 1, extensions, client, exceptionCheck, exceptionEnv); 167 if (err) { 168 // pass exceptions up - ignore other errors 169 if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure; 170 LOGE("Error processing '%s' - skipping\n", path); 171 continue; 172 } 173 } else if (fileMatchesExtension(path, extensions)) { 174 struct stat statbuf; 175 stat(path, &statbuf); 176 if (statbuf.st_size > 0) { 177 client.scanFile(path, statbuf.st_mtime, statbuf.st_size); 178 } 179 if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure; 180 } 181 } 182 } 183 184 closedir(dir); 185 return OK; 186failure: 187 closedir(dir); 188 return -1; 189} 190 191} // namespace android 192