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/*
* Copyright (C) 2010 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 android.mtp;
import android.content.Context;
import android.content.SharedPreferences;
import com.android.internal.util.Preconditions;
import libcore.util.HexEncoding;
import java.io.FileDescriptor;
import java.util.Random;
/**
* Java wrapper for MTP/PTP support as USB responder.
* {@hide}
*/
public class MtpServer implements Runnable {
private long mNativeContext; // accessed by native methods
private final MtpDatabase mDatabase;
private final Runnable mOnTerminate;
private final Context mContext;
// It requires "exactly 32 characters, including any leading 0s" in MTP spec
// (5.1.1.14 Serial Number)
private static final int sID_LEN_BYTES = 16;
private static final int sID_LEN_STR = (sID_LEN_BYTES * 2);
static {
System.loadLibrary("media_jni");
}
public MtpServer(
MtpDatabase database,
FileDescriptor controlFd,
boolean usePtp,
Runnable onTerminate,
String deviceInfoManufacturer,
String deviceInfoModel,
String deviceInfoDeviceVersion) {
mDatabase = Preconditions.checkNotNull(database);
mOnTerminate = Preconditions.checkNotNull(onTerminate);
mContext = mDatabase.getContext();
final String strID_PREFS_NAME = "mtp-cfg";
final String strID_PREFS_KEY = "mtp-id";
String strRandomId = null;
String deviceInfoSerialNumber;
SharedPreferences sharedPref =
mContext.getSharedPreferences(strID_PREFS_NAME, Context.MODE_PRIVATE);
if (sharedPref.contains(strID_PREFS_KEY)) {
strRandomId = sharedPref.getString(strID_PREFS_KEY, null);
// Check for format consistence (regenerate upon corruption)
if (strRandomId.length() != sID_LEN_STR) {
strRandomId = null;
} else {
// Only accept hex digit
for (int ii = 0; ii < strRandomId.length(); ii++)
if (Character.digit(strRandomId.charAt(ii), 16) == -1) {
strRandomId = null;
break;
}
}
}
if (strRandomId == null) {
strRandomId = getRandId();
sharedPref.edit().putString(strID_PREFS_KEY, strRandomId).apply();
}
deviceInfoSerialNumber = strRandomId;
native_setup(
database,
controlFd,
usePtp,
deviceInfoManufacturer,
deviceInfoModel,
deviceInfoDeviceVersion,
deviceInfoSerialNumber);
database.setServer(this);
}
private String getRandId() {
Random randomVal = new Random();
byte[] randomBytes = new byte[sID_LEN_BYTES];
randomVal.nextBytes(randomBytes);
return HexEncoding.encodeToString(randomBytes);
}
public void start() {
Thread thread = new Thread(this, "MtpServer");
thread.start();
}
@Override
public void run() {
native_run();
native_cleanup();
mDatabase.close();
mOnTerminate.run();
}
public void sendObjectAdded(int handle) {
native_send_object_added(handle);
}
public void sendObjectRemoved(int handle) {
native_send_object_removed(handle);
}
public void sendObjectInfoChanged(int handle) {
native_send_object_info_changed(handle);
}
public void sendDevicePropertyChanged(int property) {
native_send_device_property_changed(property);
}
public void addStorage(MtpStorage storage) {
native_add_storage(storage);
}
public void removeStorage(MtpStorage storage) {
native_remove_storage(storage.getStorageId());
}
private native final void native_setup(
MtpDatabase database,
FileDescriptor controlFd,
boolean usePtp,
String deviceInfoManufacturer,
String deviceInfoModel,
String deviceInfoDeviceVersion,
String deviceInfoSerialNumber);
private native final void native_run();
private native final void native_cleanup();
private native final void native_send_object_added(int handle);
private native final void native_send_object_removed(int handle);
private native final void native_send_object_info_changed(int handle);
private native final void native_send_device_property_changed(int property);
private native final void native_add_storage(MtpStorage storage);
private native final void native_remove_storage(int storageId);
}
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