Initial commit

src/main/java/emu/grasscutter/net/packet/PacketWriter.java

@@ -0,0 +1,177 @@
+package emu.grasscutter.net.packet;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class PacketWriter {
+	// Little endian
+	private final ByteArrayOutputStream baos;
+	
+	public PacketWriter() {
+		this.baos = new ByteArrayOutputStream(128);
+	}
+
+	public byte[] build() {
+		return baos.toByteArray();
+	}
+
+	// Writers
+	
+	public void writeEmpty(int i) {
+		while (i > 0) {
+			baos.write(0);
+			i--;
+		}
+	}
+	
+	public void writeMax(int i) {
+		while (i > 0) {
+			baos.write(0xFF);
+			i--;
+		}
+	}
+	
+	public void writeInt8(byte b) {
+        baos.write(b);
+    }
+
+	public void writeInt8(int i) {
+		baos.write((byte) i);
+	}
+	
+	public void writeBoolean(boolean b) {
+        baos.write(b ? 1 : 0);
+    }
+	
+	public void writeUint8(byte b) {
+		// Unsigned byte
+        baos.write(b & 0xFF);
+    }
+	
+	public void writeUint8(int i) {
+
+		baos.write((byte) i & 0xFF);
+	}
+	
+	public void writeUint16(int i) {
+		// Unsigned short
+        baos.write((byte) (i & 0xFF));
+        baos.write((byte) ((i >>> 8) & 0xFF));
+    }
+	
+	public void writeUint24(int i) {
+		// 24 bit integer
+        baos.write((byte) (i & 0xFF));
+        baos.write((byte) ((i >>> 8) & 0xFF));
+        baos.write((byte) ((i >>> 16) & 0xFF));
+    }
+	
+	public void writeInt16(int i) {
+		// Signed short
+        baos.write((byte) i);
+        baos.write((byte) (i >>> 8));
+    }
+
+    public void writeUint32(int i) {
+    	// Unsigned int
+        baos.write((byte) (i & 0xFF));
+        baos.write((byte) ((i >>> 8) & 0xFF));
+        baos.write((byte) ((i >>> 16) & 0xFF));
+        baos.write((byte) ((i >>> 24) & 0xFF));
+    }
+    
+    public void writeInt32(int i) {
+    	// Signed int
+        baos.write((byte) i);
+        baos.write((byte) (i >>> 8));
+        baos.write((byte) (i >>> 16));
+        baos.write((byte) (i >>> 24));
+    }
+    
+    public void writeUint32(long i) {
+    	// Unsigned int (long)
+        baos.write((byte) (i & 0xFF));
+        baos.write((byte) ((i >>> 8) & 0xFF));
+        baos.write((byte) ((i >>> 16) & 0xFF));
+        baos.write((byte) ((i >>> 24) & 0xFF));
+    }
+    
+    public void writeFloat(float f){
+    	this.writeUint32(Float.floatToRawIntBits(f));
+    }
+
+    public void writeUint64(long l) {
+        baos.write((byte) (l & 0xFF));
+        baos.write((byte) ((l >>> 8) & 0xFF));
+        baos.write((byte) ((l >>> 16) & 0xFF));
+        baos.write((byte) ((l >>> 24) & 0xFF));
+        baos.write((byte) ((l >>> 32) & 0xFF));
+        baos.write((byte) ((l >>> 40) & 0xFF));
+        baos.write((byte) ((l >>> 48) & 0xFF));
+        baos.write((byte) ((l >>> 56) & 0xFF));
+    }
+    
+    public void writeDouble(double d){
+    	long l = Double.doubleToLongBits(d);
+    	this.writeUint64(l);
+    }
+    
+    public void writeString16(String s) {
+		if (s == null) {
+			this.writeUint16(0);
+			return;
+		}
+
+    	this.writeUint16(s.length() * 2);
+    	for (int i = 0; i < s.length(); i++) {
+    		char c = s.charAt(i);
+    		this.writeUint16((short) c);
+    	}
+    }
+    
+    public void writeString8(String s) {
+		if (s == null) {
+			this.writeUint16(0);
+			return;
+		}
+
+		this.writeUint16(s.length());
+    	for (int i = 0; i < s.length(); i++) {
+    		char c = s.charAt(i);
+    		this.writeUint8((byte) c);
+    	}
+    }
+    
+    public void writeDirectString8(String s, int expectedSize) {
+		if (s == null) {
+			return;
+		}
+
+		for (int i = 0; i < expectedSize; i++) {
+    		char c = i < s.length() ? s.charAt(i) : 0;
+    		this.writeUint8((byte) c);
+    	}
+    }
+    
+    public void writeBytes(byte[] bytes) {
+    	try {
+			baos.write(bytes);
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+    }
+
+	public void writeBytes(int[] bytes) {
+		byte[] b = new byte[bytes.length];
+		for (int i = 0; i < bytes.length; i++)
+			b[i] = (byte)bytes[i];
+
+		try {
+			baos.write(b);
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+	}
+}