| /* |
| * Copyright (C) 2015 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.mtp; |
| |
| import android.os.ParcelFileDescriptor; |
| import android.os.Process; |
| import android.os.storage.StorageManager; |
| import android.util.Log; |
| import com.android.internal.annotations.VisibleForTesting; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| |
| /** |
| * TODO: Remove VisibleForTesting class. |
| */ |
| @VisibleForTesting |
| public class AppFuse { |
| static { |
| System.loadLibrary("appfuse_jni"); |
| } |
| |
| private final String mName; |
| private final Callback mCallback; |
| private final Thread mMessageThread; |
| private ParcelFileDescriptor mDeviceFd; |
| |
| @VisibleForTesting |
| AppFuse(String name, Callback callback) { |
| mName = name; |
| mCallback = callback; |
| mMessageThread = new Thread(new Runnable() { |
| @Override |
| public void run() { |
| native_start_app_fuse_loop(mDeviceFd.getFd()); |
| } |
| }); |
| } |
| |
| @VisibleForTesting |
| void mount(StorageManager storageManager) { |
| mDeviceFd = storageManager.mountAppFuse(mName); |
| mMessageThread.start(); |
| } |
| |
| @VisibleForTesting |
| void close() { |
| try { |
| // Remote side of ParcelFileDescriptor is tracking the close of mDeviceFd, and unmount |
| // the corresponding fuse file system. The mMessageThread will receive FUSE_FORGET, and |
| // then terminate itself. |
| mDeviceFd.close(); |
| mMessageThread.join(); |
| } catch (IOException exp) { |
| Log.e(MtpDocumentsProvider.TAG, "Failed to close device FD.", exp); |
| } catch (InterruptedException exp) { |
| Log.e(MtpDocumentsProvider.TAG, "Failed to terminate message thread.", exp); |
| } |
| } |
| |
| /** |
| * @param i |
| * @throws FileNotFoundException |
| */ |
| @VisibleForTesting |
| public ParcelFileDescriptor openFile(int i) throws FileNotFoundException { |
| return ParcelFileDescriptor.open(new File( |
| getMountPoint(), |
| Integer.toString(i)), |
| ParcelFileDescriptor.MODE_READ_ONLY); |
| } |
| |
| @VisibleForTesting |
| File getMountPoint() { |
| return new File("/mnt/appfuse/" + Process.myUid() + "_" + mName); |
| } |
| |
| static interface Callback { |
| long getFileSize(int inode) throws FileNotFoundException; |
| byte[] getObjectBytes(int inode, long offset, int size) throws IOException; |
| } |
| |
| @VisibleForTesting |
| private long getFileSize(int inode) { |
| try { |
| return mCallback.getFileSize(inode); |
| } catch (IOException e) { |
| return -1; |
| } |
| } |
| |
| @VisibleForTesting |
| private byte[] getObjectBytes(int inode, long offset, int size) { |
| try { |
| return mCallback.getObjectBytes(inode, offset, size); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| private native boolean native_start_app_fuse_loop(int fd); |
| } |