tikhomirov@574: /*
tikhomirov@574:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@574:  *  
tikhomirov@574:  * This program is free software; you can redistribute it and/or modify
tikhomirov@574:  * it under the terms of the GNU General Public License as published by
tikhomirov@574:  * the Free Software Foundation; version 2 of the License.
tikhomirov@574:  *
tikhomirov@574:  * This program is distributed in the hope that it will be useful,
tikhomirov@574:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@574:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@574:  * GNU General Public License for more details.
tikhomirov@574:  *
tikhomirov@574:  * For information on how to redistribute this software under
tikhomirov@574:  * the terms of a license other than GNU General Public License
tikhomirov@574:  * contact TMate Software at support@hg4j.com
tikhomirov@574:  */
tikhomirov@574: package org.tmatesoft.hg.internal;
tikhomirov@574: 
tikhomirov@574: import java.io.ByteArrayOutputStream;
tikhomirov@574: 
tikhomirov@574: /**
tikhomirov@574:  * Alternative to {@link ByteArrayOutputStream}, with extra operation that prevent extra byte[] instances
tikhomirov@574:  * 
tikhomirov@574:  * @author Artem Tikhomirov
tikhomirov@574:  * @author TMate Software Ltd.
tikhomirov@574:  */
tikhomirov@574: public class ByteVector {
tikhomirov@574: 	private byte[] data;
tikhomirov@574: 	private int count;
tikhomirov@574: 	private final int increment;
tikhomirov@574: 	
tikhomirov@574: 	
tikhomirov@574: 	public ByteVector(int initialSize, int increment) {
tikhomirov@574: 		data = new byte[initialSize];
tikhomirov@574: 		this.increment = increment;
tikhomirov@574: 	}
tikhomirov@574: 
tikhomirov@574: 	public void add(int b) {
tikhomirov@574: 		if (count == data.length) {
tikhomirov@574: 			byte[] newData = new byte[count + increment];
tikhomirov@574: 			System.arraycopy(data, 0, newData, 0, count);
tikhomirov@574: 			data = newData;
tikhomirov@574: 		}
tikhomirov@574: 		data[count++] = (byte) b;
tikhomirov@574: 	}
tikhomirov@574: 
tikhomirov@574: 	public int size() {
tikhomirov@574: 		return count;
tikhomirov@574: 	}
tikhomirov@574: 
tikhomirov@574: 	public void clear() {
tikhomirov@574: 		count = 0;
tikhomirov@574: 	}
tikhomirov@574: 	
tikhomirov@574: 	public boolean equalsTo(byte[] array) {
tikhomirov@574: 		if (array == null || array.length != count) {
tikhomirov@574: 			return false;
tikhomirov@574: 		}
tikhomirov@574: 		for (int i = 0; i < count; i++) {
tikhomirov@574: 			if (data[i] != array[i]) {
tikhomirov@574: 				return false;
tikhomirov@574: 			}
tikhomirov@574: 		}
tikhomirov@574: 		return true;
tikhomirov@574: 	}
tikhomirov@574: 	
tikhomirov@574: 	/**
tikhomirov@574: 	 * Copies content of this vector into destination array.
tikhomirov@574: 	 * @param destination array, greater or equal to {@link #size()} of the vector
tikhomirov@574: 	 */
tikhomirov@574: 	public void copyTo(byte[] destination) {
tikhomirov@574: 		if (destination == null || destination.length < count) {
tikhomirov@574: 			throw new IllegalArgumentException();
tikhomirov@574: 		}
tikhomirov@574: 		System.arraycopy(data, 0, destination, 0, count);
tikhomirov@574: 	}
tikhomirov@574: 
tikhomirov@574: 	public byte[] toByteArray() {
tikhomirov@574: 		byte[] rv = new byte[count];
tikhomirov@574: 		copyTo(rv);
tikhomirov@574: 		return rv;
tikhomirov@574: 	}
tikhomirov@574: }