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
018 package org.apache.commons.codec.binary;
019
020 import 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.html 889935 2013-12-11 05:05:13Z ggregory $
036 * @see <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a>
037 * @since 1.5
038 */
039 public 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 <=0, the encoded data is not divided into lines. If doEncode is
075 * 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 <= 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 }