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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.

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/*
 * 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;

/**
 * Like ByteArrayOutputStream, but has some performance benefit,
 * because it's not thread safe.
 */
class FastByteArrayOutputStream extends OutputStream {
    private final byte[] bytes;
    private int count;

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

    @Override
    public void write(final 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) {
            final byte[] result = new byte[count];
            System.arraycopy(bytes, 0, result, 0, count);
            return result;
        }
        return bytes;
    }

    public int getBytesWritten() {
        return count;
    }
}