src/main/java/org/apache/commons/imaging/common/MyByteArrayOutputStream.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.imaging.common;

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

public class MyByteArrayOutputStream extends OutputStream
// some performace benefit, because not thread safe.
{
    private final byte bytes[];

    public MyByteArrayOutputStream(int length)
    {
        bytes = new byte[length];
    }

    private int count = 0;

    @Override
    public void write(int value) throws IOException
    {
        if (count >= bytes.length)
            throw new IOException("Write exceeded expected length (" + count
                    + ", " + bytes.length + ")");

        bytes[count] = (byte) value;
        count++;
    }

    public byte[] toByteArray()
    {
        if (count < bytes.length)
        {
            byte result[] = new byte[count];
            System.arraycopy(bytes, 0, result, 0, count);
            return result;
        }
        return bytes;
    }

    public int getBytesWritten()
    {
        return count;
    }
}