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/*
* Copyright (C) 2011 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.adb;
import android.hardware.usb.UsbRequest;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/* This class encapsulates and adb command packet */
public class AdbMessage {
// command names
public static final int A_SYNC = 0x434e5953;
public static final int A_CNXN = 0x4e584e43;
public static final int A_OPEN = 0x4e45504f;
public static final int A_OKAY = 0x59414b4f;
public static final int A_CLSE = 0x45534c43;
public static final int A_WRTE = 0x45545257;
// ADB protocol version
public static final int A_VERSION = 0x01000000;
public static final int MAX_PAYLOAD = 4096;
private final ByteBuffer mMessageBuffer;
private final ByteBuffer mDataBuffer;
public AdbMessage() {
mMessageBuffer = ByteBuffer.allocate(24);
mDataBuffer = ByteBuffer.allocate(MAX_PAYLOAD);
mMessageBuffer.order(ByteOrder.LITTLE_ENDIAN);
mDataBuffer.order(ByteOrder.LITTLE_ENDIAN);
}
// sets the fields in the command header
public void set(int command, int arg0, int arg1, byte[] data) {
mMessageBuffer.putInt(0, command);
mMessageBuffer.putInt(4, arg0);
mMessageBuffer.putInt(8, arg1);
mMessageBuffer.putInt(12, (data == null ? 0 : data.length));
mMessageBuffer.putInt(16, (data == null ? 0 : checksum(data)));
mMessageBuffer.putInt(20, command ^ 0xFFFFFFFF);
if (data != null) {
mDataBuffer.put(data, 0, data.length);
}
}
public void set(int command, int arg0, int arg1) {
set(command, arg0, arg1, (byte[])null);
}
public void set(int command, int arg0, int arg1, String data) {
// add trailing zero
data += "\0";
set(command, arg0, arg1, data.getBytes());
}
// returns the command's message ID
public int getCommand() {
return mMessageBuffer.getInt(0);
}
// returns command's first argument
public int getArg0() {
return mMessageBuffer.getInt(4);
}
// returns command's second argument
public int getArg1() {
return mMessageBuffer.getInt(8);
}
// returns command's data buffer
public ByteBuffer getData() {
return mDataBuffer;
}
// returns command's data length
public int getDataLength() {
return mMessageBuffer.getInt(12);
}
// returns command's data as a string
public String getDataString() {
int length = getDataLength();
if (length == 0) return null;
// trim trailing zero
return new String(mDataBuffer.array(), 0, length - 1);
}
public boolean write(AdbDevice device) {
synchronized (device) {
UsbRequest request = device.getOutRequest();
request.setClientData(this);
if (request.queue(mMessageBuffer, 24)) {
int length = getDataLength();
if (length > 0) {
request = device.getOutRequest();
request.setClientData(this);
if (request.queue(mDataBuffer, length)) {
return true;
} else {
device.releaseOutRequest(request);
return false;
}
}
return true;
} else {
device.releaseOutRequest(request);
return false;
}
}
}
public boolean readCommand(UsbRequest request) {
request.setClientData(this);
return request.queue(mMessageBuffer, 24);
}
public boolean readData(UsbRequest request, int length) {
request.setClientData(this);
return request.queue(mDataBuffer, length);
}
private static String extractString(ByteBuffer buffer, int offset, int length) {
byte[] bytes = new byte[length];
for (int i = 0; i < length; i++) {
bytes[i] = buffer.get(offset++);
}
return new String(bytes);
}
@Override
public String toString() {
String commandName = extractString(mMessageBuffer, 0, 4);
int dataLength = getDataLength();
String result = "Adb Message: " + commandName + " arg0: " + getArg0() +
" arg1: " + getArg1() + " dataLength: " + dataLength;
if (dataLength > 0) {
result += (" data: \"" + getDataString() + "\"");
}
return result;
}
private static int checksum(byte[] data) {
int result = 0;
for (int i = 0; i < data.length; i++) {
int x = data[i];
// dang, no unsigned ints in java
if (x < 0) x += 256;
result += x;
}
return result;
}
}
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