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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <media/mediascanner.h>
#include <sys/stat.h>
#include <dirent.h>
namespace android {
MediaScanner::MediaScanner()
: mLocale(NULL) {
}
MediaScanner::~MediaScanner() {
setLocale(NULL);
}
void MediaScanner::setLocale(const char *locale) {
if (mLocale) {
free(mLocale);
mLocale = NULL;
}
if (locale) {
mLocale = strdup(locale);
}
}
const char *MediaScanner::locale() const {
return mLocale;
}
status_t MediaScanner::processDirectory(
const char *path, const char *extensions,
MediaScannerClient &client,
ExceptionCheck exceptionCheck, void *exceptionEnv) {
int pathLength = strlen(path);
if (pathLength >= PATH_MAX) {
return UNKNOWN_ERROR;
}
char* pathBuffer = (char *)malloc(PATH_MAX + 1);
if (!pathBuffer) {
return UNKNOWN_ERROR;
}
int pathRemaining = PATH_MAX - pathLength;
strcpy(pathBuffer, path);
if (pathLength > 0 && pathBuffer[pathLength - 1] != '/') {
pathBuffer[pathLength] = '/';
pathBuffer[pathLength + 1] = 0;
--pathRemaining;
}
client.setLocale(locale());
status_t result =
doProcessDirectory(
pathBuffer, pathRemaining, extensions, client,
exceptionCheck, exceptionEnv);
free(pathBuffer);
return result;
}
static bool fileMatchesExtension(const char* path, const char* extensions) {
char* extension = strrchr(path, '.');
if (!extension) return false;
++extension; // skip the dot
if (extension[0] == 0) return false;
while (extensions[0]) {
char* comma = strchr(extensions, ',');
size_t length = (comma ? comma - extensions : strlen(extensions));
if (length == strlen(extension) && strncasecmp(extension, extensions, length) == 0) return true;
extensions += length;
if (extensions[0] == ',') ++extensions;
}
return false;
}
status_t MediaScanner::doProcessDirectory(
char *path, int pathRemaining, const char *extensions,
MediaScannerClient &client, ExceptionCheck exceptionCheck,
void *exceptionEnv) {
// place to copy file or directory name
char* fileSpot = path + strlen(path);
struct dirent* entry;
// ignore directories that contain a ".nomedia" file
if (pathRemaining >= 8 /* strlen(".nomedia") */ ) {
strcpy(fileSpot, ".nomedia");
if (access(path, F_OK) == 0) {
LOGD("found .nomedia, skipping directory\n");
fileSpot[0] = 0;
client.addNoMediaFolder(path);
return OK;
}
// restore path
fileSpot[0] = 0;
}
DIR* dir = opendir(path);
if (!dir) {
LOGD("opendir %s failed, errno: %d", path, errno);
return UNKNOWN_ERROR;
}
while ((entry = readdir(dir))) {
const char* name = entry->d_name;
// ignore "." and ".."
if (name[0] == '.' && (name[1] == 0 || (name[1] == '.' && name[2] == 0))) {
continue;
}
int type = entry->d_type;
if (type == DT_UNKNOWN) {
// If the type is unknown, stat() the file instead.
// This is sometimes necessary when accessing NFS mounted filesystems, but
// could be needed in other cases well.
struct stat statbuf;
if (stat(path, &statbuf) == 0) {
if (S_ISREG(statbuf.st_mode)) {
type = DT_REG;
} else if (S_ISDIR(statbuf.st_mode)) {
type = DT_DIR;
}
} else {
LOGD("stat() failed for %s: %s", path, strerror(errno) );
}
}
if (type == DT_REG || type == DT_DIR) {
int nameLength = strlen(name);
bool isDirectory = (type == DT_DIR);
if (nameLength > pathRemaining || (isDirectory && nameLength + 1 > pathRemaining)) {
// path too long!
continue;
}
strcpy(fileSpot, name);
if (isDirectory) {
// ignore directories with a name that starts with '.'
// for example, the Mac ".Trashes" directory
if (name[0] == '.') continue;
strcat(fileSpot, "/");
int err = doProcessDirectory(path, pathRemaining - nameLength - 1, extensions, client, exceptionCheck, exceptionEnv);
if (err) {
// pass exceptions up - ignore other errors
if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure;
LOGE("Error processing '%s' - skipping\n", path);
continue;
}
} else if (fileMatchesExtension(path, extensions)) {
struct stat statbuf;
stat(path, &statbuf);
if (statbuf.st_size > 0) {
client.scanFile(path, statbuf.st_mtime, statbuf.st_size);
}
if (exceptionCheck && exceptionCheck(exceptionEnv)) goto failure;
}
}
}
closedir(dir);
return OK;
failure:
closedir(dir);
return -1;
}
} // namespace android
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