ByteArray.java

/*
 * Copyright 1999-2101 Alibaba Group.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.simpleimage.io;

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

/**
 * 代表一个byte数组。
 * 
 * @author Michael Zhou
 * @author wendell
 * @version $Id: ByteArray.java 593 2004-02-26 13:47:19Z baobao $
 */
public class ByteArray {

    private byte[] bytes;
    private int    offset;
    private int    length;

    public ByteArray(byte[] bytes, int offset, int length){
        this.bytes = bytes;
        this.offset = offset;
        this.length = length;
    }

    public byte[] getBytes() {
        return bytes;
    }

    public int getOffset() {
        return offset;
    }

    public int getLength() {
        return length;
    }

    public byte[] toByteArray() {
        byte[] copy = new byte[length];

        System.arraycopy(bytes, offset, copy, 0, length);

        return copy;
    }

    public InputStream toInputStream() {
        return new ByteArrayInputStream(bytes, offset, length);
    }

    public void writeTo(OutputStream out) throws IOException {
        out.write(bytes, offset, length);
    }
}