Add OutPacket interface and ByteBuf implementation

Replacement for LittleEndianWriter, GenericLittleEndianWriter,
and MaplePacketLittleEndianWriter.

src/main/java/net/packet/ByteBufInPacket.java

@@ -11,10 +11,15 @@ public class ByteBufInPacket implements InPacket {
         this.byteBuf = byteBuf;
     }
 
+    @Override
+    public short getHeader() {
+        return byteBuf.getShortLE(0);
+    }
+
     @Override
     public byte[] getBytes() {
-        // TODO
-        return null;
+        // TODO implement
+        throw new UnsupportedOperationException();
     }
 
     @Override
@@ -51,15 +56,15 @@ public class ByteBufInPacket implements InPacket {
     }
 
     @Override
-    public byte[] read(int numberOfBytes) {
-        byte[] bytes = new byte[numberOfBytes];
+    public byte[] readBytes(int bytesToRead) {
+        byte[] bytes = new byte[bytesToRead];
         byteBuf.readBytes(bytes);
         return bytes;
     }
 
     @Override
-    public void skip(int numberOfBytes) {
-        byteBuf.skipBytes(numberOfBytes);
+    public void skip(int bytesToSkip) {
+        byteBuf.skipBytes(bytesToSkip);
     }
 
     @Override

src/main/java/net/packet/ByteBufOutPacket.java

@@ -1,11 +1,88 @@
 package net.packet;
 
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import net.jcip.annotations.NotThreadSafe;
+import net.opcodes.SendOpcode;
 
+import java.awt.*;
+
+@NotThreadSafe
 public class ByteBufOutPacket implements OutPacket {
     private final ByteBuf byteBuf;
 
-    public ByteBufOutPacket(ByteBuf byteBuf) {
+    public ByteBufOutPacket(SendOpcode op) {
+        ByteBuf byteBuf = Unpooled.buffer();
+        byteBuf.writeShortLE((short) op.getValue());
         this.byteBuf = byteBuf;
     }
+
+    public ByteBufOutPacket(SendOpcode op, int initialCapacity) {
+        ByteBuf byteBuf = Unpooled.buffer(initialCapacity);
+        byteBuf.writeShortLE((short) op.getValue());
+        this.byteBuf = byteBuf;
+    }
+
+    @Override
+    public short getHeader() {
+        return byteBuf.getShortLE(0);
+    }
+
+    @Override
+    public byte[] getBytes() {
+        // TODO implement
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void writeByte(byte value) {
+        byteBuf.writeByte(value);
+    }
+
+    @Override
+    public void writeByte(int value) {
+        writeByte((byte) value);
+    }
+
+    @Override
+    public void writeBytes(byte[] value) {
+        byteBuf.writeBytes(value);
+    }
+
+    @Override
+    public void writeShort(short value) {
+        byteBuf.writeShortLE(value);
+    }
+
+    @Override
+    public void writeInt(int value) {
+        byteBuf.writeIntLE(value);
+    }
+
+    @Override
+    public void writeLong(long value) {
+        byteBuf.writeLongLE(value);
+    }
+
+    @Override
+    public void writeBoolean(boolean value) {
+        byteBuf.writeByte(value ? 1 : 0);
+    }
+
+    @Override
+    public void writeString(String value) {
+        writeShort((short) value.length());
+        writeBytes(value.getBytes(STRING_CHARSET));
+    }
+
+    @Override
+    public void writePoint(Point value) {
+        writeShort((short) value.getX());
+        writeShort((short) value.getY());
+    }
+
+    @Override
+    public void skip(int bytesToSkip) {
+        writeBytes(new byte[bytesToSkip]);
+    }
 }

src/main/java/net/packet/InPacket.java

@@ -9,7 +9,7 @@ public interface InPacket extends Packet {
     long readLong();
     Point readPoint();
     String readString();
-    byte[] read(int numberOfBytes);
+    byte[] readBytes(int bytesToRead);
     void skip(int numberOfBytes);
     int available();
     void seek(int byteOffset);

src/main/java/net/packet/OutPacket.java

@@ -1,4 +1,20 @@
 package net.packet;
 
+import java.awt.*;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+
 public interface OutPacket extends Packet {
+    Charset STRING_CHARSET = StandardCharsets.US_ASCII;
+
+    void writeByte(byte value);
+    void writeByte(int value);
+    void writeBytes(byte[] value);
+    void writeShort(short value);
+    void writeInt(int value);
+    void writeLong(long value);
+    void writeBoolean(boolean value);
+    void writeString(String value);
+    void writePoint(Point value);
+    void skip(int numberOfBytes);
 }

src/main/java/net/packet/Packet.java

@@ -1,5 +1,6 @@
 package net.packet;
 
 public interface Packet {
+    short getHeader();
     byte[] getBytes();
 }