Update (04. September 2012):
- Fehler in den Methoden readShort und readInt in PacketReader behoben.
- Strings werden mit ISO-LATIN-1 en-/dekodiert.
- Die Länge bei Strings wird standardmäßig als Unsigned Short (bis zu 65 kb) vorangestellt.
Hier sind die Packet-Klassen aus einem neuen Projekt von mir. Es werden sowohl Big Endian (Standard) als auch Little Endian Byte Order sowie Signed und Unsigned Werte unterstützt.
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package tools;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
/**
*
* @author Flav
*/
public class PacketReader {
private static Charset charset;
private ByteOrder order;
private byte[] bytes;
private int offset;
static {
charset = Charset.forName("ISO-8859-1");
}
public PacketReader(byte[] bytes) {
this(ByteOrder.BIG_ENDIAN, bytes);
}
public PacketReader(ByteOrder order, byte[] bytes) {
this.order = order;
this.bytes = bytes;
offset = 0;
}
public int remaining() {
return bytes.length - offset;
}
public byte readByte() {
return bytes[offset++];
}
public short readUnsignedByte() {
return (short) (readByte() & 0xFF);
}
public byte[] readByteArray(int length) {
byte[] arr = new byte[length];
for (int i = 0; i < length; i++) {
arr[i] = readByte();
}
return arr;
}
public short readShort() {
short b1 = readUnsignedByte();
short b2 = readUnsignedByte();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return (short) (b1 << 8 | b2);
}
return (short) (b2 << 8 | b1);
}
public int readUnsignedShort() {
return readShort() & 0xFFFF;
}
public int readInt() {
short b1 = readUnsignedByte();
short b2 = readUnsignedByte();
short b3 = readUnsignedByte();
short b4 = readUnsignedByte();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return b1 << 24 | b2 << 16 | b3 << 8 | b4;
}
return b4 << 24 | b3 << 16 | b2 << 8 | b1;
}
public long readUnsignedInt() {
return readInt() & 0xFFFFFFFFL;
}
public long readLong() {
short b1 = readUnsignedByte();
short b2 = readUnsignedByte();
short b3 = readUnsignedByte();
short b4 = readUnsignedByte();
short b5 = readUnsignedByte();
short b6 = readUnsignedByte();
short b7 = readUnsignedByte();
short b8 = readUnsignedByte();
if (order.equals(ByteOrder.BIG_ENDIAN)) {
return (long) b1 << 56 | (long) b2 << 48 | (long) b3 << 40
| (long) b4 << 32 | (long) b5 << 24 | b6 << 16 | b7 << 8 | b8;
}
return (long) b8 << 56 | (long) b7 << 48 | (long) b6 << 40
| (long) b5 << 32 | (long) b4 << 24 | b3 << 16 | b2 << 8 | b1;
}
public String readString() {
return readString(readUnsignedShort());
}
public String readString(int length) {
return new String(readByteArray(length), charset);
}
}
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package tools;
import java.io.ByteArrayOutputStream;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
/**
*
* @author Flav
*/
public class PacketWriter {
private static Charset charset;
private ByteOrder order;
private ByteArrayOutputStream out;
static {
charset = Charset.forName("ISO-8859-1");
}
public PacketWriter() {
this(ByteOrder.BIG_ENDIAN);
}
public PacketWriter(int capacity) {
this(ByteOrder.BIG_ENDIAN, capacity);
}
public PacketWriter(ByteOrder order) {
this.order = order;
out = new ByteArrayOutputStream();
}
public PacketWriter(ByteOrder order, int capacity) {
this.order = order;
out = new ByteArrayOutputStream(capacity);
}
public byte[] toByteArray() {
return out.toByteArray();
}
public void writeByte(long value) {
out.write((byte) value);
}
public void writeByteArray(byte[] arr) {
int length = arr.length;
for (int i = 0; i < length; i++) {
writeByte(arr[i]);
}
}
public void writeShort(int value) {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
writeByte(value >> 8);
writeByte(value);
} else {
writeByte(value);
writeByte(value >> 8);
}
}
public void writeInt(long value) {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
writeByte(value >> 24);
writeByte(value >> 16);
writeByte(value >> 8);
writeByte(value);
} else {
writeByte(value);
writeByte(value >> 8);
writeByte(value >> 16);
writeByte(value >> 24);
}
}
public void writeLong(long value) {
if (order.equals(ByteOrder.BIG_ENDIAN)) {
writeByte(value >> 56);
writeByte(value >> 48);
writeByte(value >> 40);
writeByte(value >> 32);
writeByte(value >> 24);
writeByte(value >> 16);
writeByte(value >> 8);
writeByte(value);
} else {
writeByte(value);
writeByte(value >> 8);
writeByte(value >> 16);
writeByte(value >> 24);
writeByte(value >> 32);
writeByte(value >> 40);
writeByte(value >> 48);
writeByte(value >> 56);
}
}
public void writeString(String str) {
writeString(str, true);
}
public void writeString(String str, boolean writeLength) {
byte[] bytes = str.getBytes(charset);
if (writeLength) {
writeShort(bytes.length);
}
writeByteArray(bytes);
}
}
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