129 lines
4.2 KiB
Java
129 lines
4.2 KiB
Java
/*
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* Copyright 2017 Martijn Brekhof. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.xbmc.kore.testutils.eventserver;
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import org.xbmc.kore.eventclient.Packet;
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import org.xbmc.kore.utils.LogUtils;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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/**
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* Class that implements a single event packet.
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* <pre>
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* -----------------------------
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* | -H1 Signature ("XBMC") | - 4 x CHAR 4B
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* | -H2 Version (eg. 2.0) | - 2 x UNSIGNED CHAR 2B
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* | -H3 PacketType | - 1 x UNSIGNED SHORT 2B
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* | -H4 Sequence number | - 1 x UNSIGNED LONG 4B
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* | -H5 No. of packets in msg | - 1 x UNSIGNED LONG 4B
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* | -H6 Payloadsize of packet | - 1 x UNSIGNED SHORT 2B
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* | -H7 Client's unique token | - 1 x UNSIGNED LONG 4B
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* | -H8 Reserved | - 10 x UNSIGNED CHAR 10B
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* |---------------------------|
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* | -P1 payload | -
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* -----------------------------
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* </pre>
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*/
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abstract public class EventPacket {
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private static final String TAG = LogUtils.makeLogTag(EventPacket.class);
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//Package types
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public final static byte PT_BUTTON = 0x03;
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private String signature;
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private String version;
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private int packetType;
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private long sequenceNumber;
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private long numberOfPackets;
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private int payloadSize;
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private long token;
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private byte[] payload;
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private EventPacket() {}
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EventPacket(byte[] packet) {
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signature = new String(new byte[] {packet[0], packet[1], packet[2], packet[3]});
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version = ((int) packet[4]) + "." + ((int) packet[5]);
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packetType = ByteBuffer.wrap(packet, 6, 2).getChar();
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sequenceNumber = ByteBuffer.wrap(packet, 8, 4).getInt();
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numberOfPackets = ByteBuffer.wrap(packet, 12, 4).getInt();
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payloadSize = ByteBuffer.wrap(packet, 16, 2).getChar();
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token = ByteBuffer.wrap(packet, 18, 4).getInt();
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//Reserved 22 - 32
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payload = new byte[payloadSize];
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ByteBuffer.wrap(packet, 32, payloadSize).get(payload);
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}
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@Override
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public String toString() {
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return signature + ":" +
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version + ":" +
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packetType + ":" +
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sequenceNumber + ":" +
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numberOfPackets + ":" +
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payloadSize + ":" +
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token+ ":" +
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payload;
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}
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public int getPacketType() {
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return packetType;
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}
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public byte[] getPayload() {
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return payload;
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}
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/**
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* Returns the packet type from a {@link Packet} as a single byte.
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* <br/>
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* Note that, although the specification specifies two bytes,
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* we only use a single byte in {@link Packet} for the packet types.
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* @param packet
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* @return second byte of packet type
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*/
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static public byte getPacketType(byte[] packet) {
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return packet[7];
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}
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/**
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* Gets the string from payload terminated by 0x00.
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* @param payload byte array holding the characters
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* @param offset starting offset of string
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* @return string from payload or null if not found
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*/
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String getStringFromPayload(byte[] payload, int offset) {
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int strTerminatorIndex = offset;
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for (; strTerminatorIndex < payload.length; strTerminatorIndex++) {
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if (payload[strTerminatorIndex] == 0x00)
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break;
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}
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if (strTerminatorIndex == payload.length)
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return null;
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int stringLength = strTerminatorIndex - offset;
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byte[] bytes = new byte[stringLength];
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System.arraycopy(payload, offset, bytes, 0, stringLength);
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return new String(bytes);
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}
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}
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