package org.warp.cowdb;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

public class ByteBufferBackedInputStream extends InputStream {

	ByteBuffer buf;

	public ByteBufferBackedInputStream(ByteBuffer buf) {
		this.buf = buf;
	}

	public int read() throws IOException {
		if (!buf.hasRemaining()) {
			return -1;
		}
		return buf.get() & 0xFF;
	}

	public int read(byte[] bytes, int off, int len)
					throws IOException {
		if (!buf.hasRemaining()) {
			return -1;
		}

		len = Math.min(len, buf.remaining());
		buf.get(bytes, off, len);
		return len;

	}
}