org.apache.commons.codec.binary.Base32OutputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of commons-codec Show documentation

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.

There is a newer version: 62

Show newest version

/*
 * 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.codec.binary;

import java.io.OutputStream;

/**
 * Provides Base32 encoding and decoding in a streaming fashion (unlimited size). When encoding the default lineLength
 * is 76 characters and the default lineEnding is CRLF, but these can be overridden by using the appropriate
 * constructor.
 * 
 * The default behaviour of the Base32OutputStream is to ENCODE, whereas the default behaviour of the Base32InputStream
 * is to DECODE. But this behaviour can be overridden by using a different constructor.
 * 
 * 
 * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode
 * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).
 * 
 * 
 * Note: It is mandatory to close the stream after the last byte has been written to it, otherwise the
 * final padding will be omitted and the resulting data will be incomplete/inconsistent.
 * 
 *
 * @see RFC 4648
 * @since 1.5
 */
public class Base32OutputStream extends BaseNCodecOutputStream {

    /**
     * Creates a Base32OutputStream such that all data written is Base32-encoded to the original provided OutputStream.
     *
     * @param out
     *            OutputStream to wrap.
     */
    public Base32OutputStream(final OutputStream out) {
        this(out, true);
    }

    /**
     * Creates a Base32OutputStream such that all data written is either Base32-encoded or Base32-decoded to the
     * original provided OutputStream.
     *
     * @param out
     *            OutputStream to wrap.
     * @param doEncode
     *            true if we should encode all data written to us, false if we should decode.
     */
    public Base32OutputStream(final OutputStream out, final boolean doEncode) {
        super(out, new Base32(false), doEncode);
    }

    /**
     * Creates a Base32OutputStream such that all data written is either Base32-encoded or Base32-decoded to the
     * original provided OutputStream.
     *
     * @param ouput
     *            OutputStream to wrap.
     * @param doEncode
     *            true if we should encode all data written to us, false if we should decode.
     * @param lineLength
     *            If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
     *            nearest multiple of 4). If lineLength <= 0, the encoded data is not divided into lines. If doEncode
     *            is false, lineLength is ignored.
     * @param lineSeparator
     *            If doEncode is true, each line of encoded data will be terminated with this byte sequence (e.g. \r\n).
     *            If lineLength <= 0, the lineSeparator is not used. If doEncode is false lineSeparator is ignored.
     */
    public Base32OutputStream(final OutputStream ouput, final boolean doEncode,
                              final int lineLength, final byte[] lineSeparator) {
        super(ouput, new Base32(lineLength, lineSeparator), doEncode);
    }

}