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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   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 org.apache.xmlbeans.impl.common;

import java.io.Reader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.io.UnsupportedEncodingException;
import java.io.IOException;

public class ReaderInputStream extends PushedInputStream
{
    private Reader reader;
    private Writer writer;
    private char[] buf;
    public static int defaultBufferSize = 2048;

    public ReaderInputStream(Reader reader, String encoding) throws UnsupportedEncodingException
    {
        this(reader, encoding, defaultBufferSize);
    }

    public ReaderInputStream(Reader reader, String encoding, int bufferSize) throws UnsupportedEncodingException
    {
        if (bufferSize <= 0)
            throw new IllegalArgumentException("Buffer size <= 0");

        this.reader = reader;
        this.writer = new OutputStreamWriter(getOutputStream(), encoding);
        buf = new char[bufferSize];
    }

    public void fill(int requestedBytes) throws IOException
    {
        do
        {
            int chars = reader.read(buf);
            if (chars < 0)
                return;

            writer.write(buf, 0, chars);
            writer.flush();
        }
        while (available() <= 0); // loop for safety, in case encoding didn't produce any bytes yet
    }
}