    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.codec.binary;
    019
    020import java.io.InputStream;
    021
    022/**
    023 * Provides Base32 encoding and decoding in a streaming fashion (unlimited size). When encoding the default lineLength
    024 * is 76 characters and the default lineEnding is CRLF, but these can be overridden by using the appropriate
    025 * constructor.
    026 * <p>
    027 * The default behaviour of the Base32InputStream is to DECODE, whereas the default behaviour of the Base32OutputStream
    028 * is to ENCODE, but this behaviour can be overridden by using a different constructor.
    029 * </p>
    030 * <p>
    031 * Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode
    032 * character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).
    033 * </p>
    034 *
    035 * @version $Id: Base32InputStream.java 1586299 2014-04-10 13:50:21Z ggregory $
    036 * @see <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a>
    037 * @since 1.5
    038 */
    039public class Base32InputStream extends BaseNCodecInputStream {
    040
    041    /**
    042     * Creates a Base32InputStream such that all data read is Base32-decoded from the original provided InputStream.
    043     *
    044     * @param in
    045     *            InputStream to wrap.
    046     */
    047    public Base32InputStream(final InputStream in) {
    048        this(in, false);
    049    }
    050
    051    /**
    052     * Creates a Base32InputStream such that all data read is either Base32-encoded or Base32-decoded from the original
    053     * provided InputStream.
    054     *
    055     * @param in
    056     *            InputStream to wrap.
    057     * @param doEncode
    058     *            true if we should encode all data read from us, false if we should decode.
    059     */
    060    public Base32InputStream(final InputStream in, final boolean doEncode) {
    061        super(in, new Base32(false), doEncode);
    062    }
    063
    064    /**
    065     * Creates a Base32InputStream such that all data read is either Base32-encoded or Base32-decoded from the original
    066     * provided InputStream.
    067     *
    068     * @param in
    069     *            InputStream to wrap.
    070     * @param doEncode
    071     *            true if we should encode all data read from us, false if we should decode.
    072     * @param lineLength
    073     *            If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
    074     *            nearest multiple of 4). If lineLength &lt;= 0, the encoded data is not divided into lines. If doEncode
    075     *            is false, lineLength is ignored.
    076     * @param lineSeparator
    077     *            If doEncode is true, each line of encoded data will be terminated with this byte sequence (e.g. \r\n).
    078     *            If lineLength &lt;= 0, the lineSeparator is not used. If doEncode is false lineSeparator is ignored.
    079     */
    080    public Base32InputStream(final InputStream in, final boolean doEncode,
    081                             final int lineLength, final byte[] lineSeparator) {
    082        super(in, new Base32(lineLength, lineSeparator), doEncode);
    083    }
    084
    085}