91 lines
4.1 KiB
Java
91 lines
4.1 KiB
Java
/*
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* Conditions Of Use
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*
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* This software was developed by employees of the National Institute of
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* Standards and Technology (NIST), an agency of the Federal Government.
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* Pursuant to title 15 Untied States Code Section 105, works of NIST
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* employees are not subject to copyright protection in the United States
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* and are considered to be in the public domain. As a result, a formal
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* license is not needed to use the software.
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*
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* This software is provided by NIST as a service and is expressly
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* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
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* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
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* AND DATA ACCURACY. NIST does not warrant or make any representations
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* regarding the use of the software or the results thereof, including but
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* not limited to the correctness, accuracy, reliability or usefulness of
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* the software.
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*
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* Permission to use this software is contingent upon your acceptance
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* of the terms of this agreement
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*
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* .
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*
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*/
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package gov.nist.javax.sip.address;
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import java.io.UnsupportedEncodingException;
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/**
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* Copied from Apache Excalibur project.
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* Source code available at http://www.google.com/codesearch?hl=en&q=+excalibur+decodePath+show:sK_gDY0W5Rw:OTjCHAiSuF0:th3BdHtpX20&sa=N&cd=1&ct=rc&cs_p=http://apache.edgescape.com/excalibur/excalibur-sourceresolve/source/excalibur-sourceresolve-1.1-src.zip&cs_f=excalibur-sourceresolve-1.1/src/java/org/apache/excalibur/source/SourceUtil.java
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* @author <A HREF="mailto:jean.deruelle@gmail.com">Jean Deruelle</A>
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*
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*/
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public class RFC2396UrlDecoder {
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/**
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* Decode a path.
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*
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* <p>Interprets %XX (where XX is hexadecimal number) as UTF-8 encoded bytes.
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* <p>The validity of the input path is not checked (i.e. characters that
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* were not encoded will not be reported as errors).
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* <p>This method differs from URLDecoder.decode in that it always uses UTF-8
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* (while URLDecoder uses the platform default encoding, often ISO-8859-1),
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* and doesn't translate + characters to spaces.
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*
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* @param uri the path to decode
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* @return the decoded path
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*/
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public static String decode(String uri) {
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StringBuffer translatedUri = new StringBuffer(uri.length());
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byte[] encodedchars = new byte[uri.length() / 3];
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int i = 0;
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int length = uri.length();
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int encodedcharsLength = 0;
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while (i < length) {
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if (uri.charAt(i) == '%') {
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//we must process all consecutive %-encoded characters in one go, because they represent
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//an UTF-8 encoded string, and in UTF-8 one character can be encoded as multiple bytes
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while (i < length && uri.charAt(i) == '%') {
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if (i + 2 < length) {
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try {
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byte x = (byte)Integer.parseInt(uri.substring(i + 1, i + 3), 16);
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encodedchars[encodedcharsLength] = x;
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} catch (NumberFormatException e) {
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throw new IllegalArgumentException("Illegal hex characters in pattern %" + uri.substring(i + 1, i + 3));
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}
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encodedcharsLength++;
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i += 3;
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} else {
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throw new IllegalArgumentException("% character should be followed by 2 hexadecimal characters.");
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}
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}
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try {
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String translatedPart = new String(encodedchars, 0, encodedcharsLength, "UTF-8");
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translatedUri.append(translatedPart);
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} catch (UnsupportedEncodingException e) {
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//the situation that UTF-8 is not supported is quite theoretical, so throw a runtime exception
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throw new RuntimeException("Problem in decodePath: UTF-8 encoding not supported.");
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}
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encodedcharsLength = 0;
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} else {
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//a normal character
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translatedUri.append(uri.charAt(i));
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i++;
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}
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}
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return translatedUri.toString();
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}
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} |