commons-codec-1.11.jar - Apache Commons Codec

commons-codec-1.11.jar is the JAR file for Apache Commons Codec 1.11, which provides implementations of common encoders and decoders such as Base64, Hex, Phonetic and URLs.

JAR File Size and Download Location:

JAR name: commons-codec.jar
Target JDK version: 1.8
Dependency: None
File name: commons-codec-1.11.jar
File size: 335,042 bytes
Date modified: 10/17/2017 
Download: Apache Commons Codec

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org/apache/commons/codec/net/RFC1522Codec.java

/*
 * 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.net;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.binary.StringUtils;

/**
 * Implements methods common to all codecs defined in RFC 1522.
 * <p>
 * <a href="http://www.ietf.org/rfc/rfc1522.txt">RFC 1522</a> describes techniques to allow the
 * encoding of non-ASCII text in various portions of a RFC 822 [2] message header, in a manner which
 * is unlikely to confuse existing message handling software.
 * <p>
 * This class is immutable and thread-safe.
 *
 * @see <a href="http://www.ietf.org/rfc/rfc1522.txt">MIME (Multipurpose Internet Mail Extensions) Part Two:
 *          Message Header Extensions for Non-ASCII Text</a>
 *
 * @since 1.3
 * @version $Id: RFC1522Codec.java 1619948 2014-08-22 22:53:55Z ggregory $
 */
abstract class RFC1522Codec {

    /** Separator. */
    protected static final char SEP = '?';

    /** Prefix. */
    protected static final String POSTFIX = "?=";

    /** Postfix. */
    protected static final String PREFIX = "=?";

    /**
     * Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
     * <p>
     * This method constructs the "encoded-word" header common to all the RFC 1522 codecs and then invokes
     * {@link #doEncoding(byte [])} method of a concrete class to perform the specific encoding.
     *
     * @param text
     *            a string to encode
     * @param charset
     *            a charset to be used
     * @return RFC 1522 compliant "encoded-word"
     * @throws EncoderException
     *             thrown if there is an error condition during the Encoding process.
     * @see <a href="http://download.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
     */
    protected String encodeText(final String text, final Charset charset) throws EncoderException {
        if (text == null) {
            return null;
        }
        final StringBuilder buffer = new StringBuilder();
        buffer.append(PREFIX);
        buffer.append(charset);
        buffer.append(SEP);
        buffer.append(this.getEncoding());
        buffer.append(SEP);
        final byte [] rawData = this.doEncoding(text.getBytes(charset));
        buffer.append(StringUtils.newStringUsAscii(rawData));
        buffer.append(POSTFIX);
        return buffer.toString();
    }

    /**
     * Applies an RFC 1522 compliant encoding scheme to the given string of text with the given charset.
     * <p>
     * This method constructs the "encoded-word" header common to all the RFC 1522 codecs and then invokes
     * {@link #doEncoding(byte [])} method of a concrete class to perform the specific encoding.
     *
     * @param text
     *            a string to encode
     * @param charsetName
     *            the charset to use
     * @return RFC 1522 compliant "encoded-word"
     * @throws EncoderException
     *             thrown if there is an error condition during the Encoding process.
     * @throws UnsupportedEncodingException
     *             if charset is not available
     *
     * @see <a href="http://download.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
     */
    protected String encodeText(final String text, final String charsetName)
            throws EncoderException, UnsupportedEncodingException {
        if (text == null) {
            return null;
        }
        return this.encodeText(text, Charset.forName(charsetName));
    }

    /**
     * Applies an RFC 1522 compliant decoding scheme to the given string of text.
     * <p>
     * This method processes the "encoded-word" header common to all the RFC 1522 codecs and then invokes
     * {@link #doEncoding(byte [])} method of a concrete class to perform the specific decoding.
     *
     * @param text
     *            a string to decode
     * @return A new decoded String or <code>null</code> if the input is <code>null</code>.
     * @throws DecoderException
     *             thrown if there is an error condition during the decoding process.
     * @throws UnsupportedEncodingException
     *             thrown if charset specified in the "encoded-word" header is not supported
     */
    protected String decodeText(final String text)
            throws DecoderException, UnsupportedEncodingException {
        if (text == null) {
            return null;
        }
        if (!text.startsWith(PREFIX) || !text.endsWith(POSTFIX)) {
            throw new DecoderException("RFC 1522 violation: malformed encoded content");
        }
        final int terminator = text.length() - 2;
        int from = 2;
        int to = text.indexOf(SEP, from);
        if (to == terminator) {
            throw new DecoderException("RFC 1522 violation: charset token not found");
        }
        final String charset = text.substring(from, to);
        if (charset.equals("")) {
            throw new DecoderException("RFC 1522 violation: charset not specified");
        }
        from = to + 1;
        to = text.indexOf(SEP, from);
        if (to == terminator) {
            throw new DecoderException("RFC 1522 violation: encoding token not found");
        }
        final String encoding = text.substring(from, to);
        if (!getEncoding().equalsIgnoreCase(encoding)) {
            throw new DecoderException("This codec cannot decode " + encoding + " encoded content");
        }
        from = to + 1;
        to = text.indexOf(SEP, from);
        byte[] data = StringUtils.getBytesUsAscii(text.substring(from, to));
        data = doDecoding(data);
        return new String(data, charset);
    }

    /**
     * Returns the codec name (referred to as encoding in the RFC 1522).
     *
     * @return name of the codec
     */
    protected abstract String getEncoding();

    /**
     * Encodes an array of bytes using the defined encoding scheme.
     *
     * @param bytes
     *            Data to be encoded
     * @return A byte array containing the encoded data
     * @throws EncoderException
     *             thrown if the Encoder encounters a failure condition during the encoding process.
     */
    protected abstract byte[] doEncoding(byte[] bytes) throws EncoderException;

    /**
     * Decodes an array of bytes using the defined encoding scheme.
     *
     * @param bytes
     *            Data to be decoded
     * @return a byte array that contains decoded data
     * @throws DecoderException
     *             A decoder exception is thrown if a Decoder encounters a failure condition during the decode process.
     */
    protected abstract byte[] doDecoding(byte[] bytes) throws DecoderException;
}

org/apache/commons/codec/net/RFC1522Codec.java

 

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