An output stream implementation over a Vert.x `Buffer` instance - like `ByteArrayOutputStream` but a bit Vert.xified.

VertxBufferOutputStream.java

import java.io.IOException;
import java.io.OutputStream;

import io.vertx.core.buffer.Buffer;

public class VertxBufferOutputStream extends OutputStream {
	private Buffer buffer;
	
	public BufferOutputStream() {
		this.buffer = Buffer.buffer();
	}
	
	@Override
	public void write(int b) throws IOException {
		buffer.appendByte((byte)(b & 0xFF));
	}
	
	@Override
	public void write(byte[] b) throws IOException {
		buffer.appendBytes(b);
	}
	
	@Override
	public void write(byte[] b, int off, int len) throws IOException {
		buffer.appendBytes(b, off, len);
	}
	
	public Buffer getBuffer() {
		return this.buffer.copy();
	}
}