org.apache.commons.codec.binary.Base32InputStream Maven / Gradle / Ivy
/*
* 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.InputStream;
import org.apache.commons.codec.CodecPolicy;
/**
* 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 behavior of the Base32InputStream is to DECODE, whereas the default behavior of the Base32OutputStream
* is to ENCODE, but this behavior 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).
*
*
* You can set the decoding behavior when the input bytes contain leftover trailing bits that cannot be created by a
* valid encoding. These can be bits that are unused from the final character or entire characters. The default mode is
* lenient decoding.
*
*
* - Lenient: Any trailing bits are composed into 8-bit bytes where possible. The remainder are discarded.
*
- Strict: The decoding will raise an {@link IllegalArgumentException} if trailing bits are not part of a valid
* encoding. Any unused bits from the final character must be zero. Impossible counts of entire final characters are not
* allowed.
*
*
* When strict decoding is enabled it is expected that the decoded bytes will be re-encoded to a byte array that matches
* the original, i.e. no changes occur on the final character. This requires that the input bytes use the same padding
* and alphabet as the encoder.
*
* @see RFC 4648
* @since 1.5
*/
public class Base32InputStream extends BaseNCodecInputStream {
/**
* Creates a Base32InputStream such that all data read is Base32-decoded from the original provided InputStream.
*
* @param inputStream
* InputStream to wrap.
*/
public Base32InputStream(final InputStream inputStream) {
this(inputStream, false);
}
/**
* Creates a Base32InputStream such that all data read is either Base32-encoded or Base32-decoded from the original
* provided InputStream.
*
* @param inputStream
* InputStream to wrap.
* @param doEncode
* true if we should encode all data read from us, false if we should decode.
*/
public Base32InputStream(final InputStream inputStream, final boolean doEncode) {
super(inputStream, new Base32(false), doEncode);
}
/**
* Creates a Base32InputStream such that all data read is either Base32-encoded or Base32-decoded from the original
* provided InputStream.
*
* @param inputStream
* InputStream to wrap.
* @param doEncode
* true if we should encode all data read from us, false if we should decode.
* @param lineLength
* If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
* the 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 Base32InputStream(final InputStream inputStream, final boolean doEncode, final int lineLength, final byte[] lineSeparator) {
super(inputStream, new Base32(lineLength, lineSeparator), doEncode);
}
/**
* Creates a Base32InputStream such that all data read is either Base32-encoded or Base32-decoded from the original
* provided InputStream.
*
* @param inputStream
* InputStream to wrap.
* @param doEncode
* true if we should encode all data read from us, false if we should decode.
* @param lineLength
* If doEncode is true, each line of encoded data will contain lineLength characters (rounded down to
* the 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.
* @param decodingPolicy
* The decoding policy.
* @since 1.15
*/
public Base32InputStream(final InputStream inputStream, final boolean doEncode, final int lineLength, final byte[] lineSeparator,
final CodecPolicy decodingPolicy) {
super(inputStream, new Base32(lineLength, lineSeparator, false, BaseNCodec.PAD_DEFAULT, decodingPolicy), doEncode);
}
}