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/*
* Copyright (C) 2014 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.
*/
package com.android.providers.downloads;
import android.app.DownloadManager;
import android.system.ErrnoException;
import android.system.Os;
import android.system.StructStat;
import com.google.android.collect.Lists;
import java.io.File;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
/**
* Utility methods for managing storage space related to
* {@link DownloadManager}.
*/
public class StorageUtils {
/**
* Return list of all normal files under the given directory, traversing
* directories recursively.
*
* @param exclude ignore dirs with this name, or {@code null} to ignore.
* @param uid only return files owned by this UID, or {@code -1} to ignore.
*/
static List<ConcreteFile> listFilesRecursive(File startDir, String exclude, int uid) {
final ArrayList<ConcreteFile> files = Lists.newArrayList();
final LinkedList<File> dirs = new LinkedList<File>();
dirs.add(startDir);
while (!dirs.isEmpty()) {
final File dir = dirs.removeFirst();
if (Objects.equals(dir.getName(), exclude)) continue;
final File[] children = dir.listFiles();
if (children == null) continue;
for (File child : children) {
if (child.isDirectory()) {
dirs.add(child);
} else if (child.isFile()) {
try {
final ConcreteFile file = new ConcreteFile(child);
if (uid == -1 || file.stat.st_uid == uid) {
files.add(file);
}
} catch (ErrnoException ignored) {
}
}
}
}
return files;
}
/**
* Concrete file on disk that has a backing device and inode. Faster than
* {@code realpath()} when looking for identical files.
*/
static class ConcreteFile {
public final File file;
public final StructStat stat;
public ConcreteFile(File file) throws ErrnoException {
this.file = file;
this.stat = Os.lstat(file.getAbsolutePath());
}
@Override
public int hashCode() {
int result = 1;
result = 31 * result + (int) (stat.st_dev ^ (stat.st_dev >>> 32));
result = 31 * result + (int) (stat.st_ino ^ (stat.st_ino >>> 32));
return result;
}
@Override
public boolean equals(Object o) {
if (o instanceof ConcreteFile) {
final ConcreteFile f = (ConcreteFile) o;
return (f.stat.st_dev == stat.st_dev) && (f.stat.st_ino == stat.st_ino);
}
return false;
}
}
}
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