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Basic utilities to compensate shortcomings of Java SE. Part of chicory.
There is a newer version: 0.36
/*
 * Copyright (c) 2012, Victor Nazarov 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Victor Nazarov nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.github.sviperll.io;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;

public class LineSplitterOutputStream extends OutputStream {
    private static final byte[] DEFAULT_LINE_SPLITTING_BYTE_SEQUENCE = "\r\n".getBytes(Charsets.ASCII);

    private final int splitLinesAt;
    private final OutputStream os;
    private final byte[] lineSplitingByteSequence;

    private int lineLength = 0;

    public LineSplitterOutputStream(OutputStream os) {
        this(os, 76);
    }

    public LineSplitterOutputStream(OutputStream os, int splitLinesAt) {
        this(os, splitLinesAt, DEFAULT_LINE_SPLITTING_BYTE_SEQUENCE);
    }

    public LineSplitterOutputStream(OutputStream os, int splitLinesAt, byte[] lineSplitingByteSequence) {
        this.os = os;
        this.splitLinesAt = splitLinesAt;
        this.lineSplitingByteSequence =
                lineSplitingByteSequence == DEFAULT_LINE_SPLITTING_BYTE_SEQUENCE
                    ? DEFAULT_LINE_SPLITTING_BYTE_SEQUENCE
                    : Arrays.copyOf(lineSplitingByteSequence, lineSplitingByteSequence.length);
    }

    @Override
    public void write(int b) throws IOException {
        os.write(b);
        lineLength++;
        if (lineLength == splitLinesAt) {
            os.write(lineSplitingByteSequence);
            lineLength = 0;
        }
    }

    @Override
    public void flush() throws IOException {
        os.flush();
    }

    @Override
    public void close() throws IOException {
        os.close();
    }
}