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/*
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.xml.internal.messaging.saaj.util;
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// Cut&paste from sun.net.www.ParseUtil: decode, unescape
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public class ParseUtil {
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/**
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* Un-escape and return the character at position i in string s.
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*/
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private static char unescape(String s, int i) {
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return (char) Integer.parseInt(s.substring(i+1,i+3),16);
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}
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/**
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* Returns a new String constructed from the specified String by replacing
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* the URL escape sequences and UTF8 encoding with the characters they
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* represent.
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*/
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public static String decode(String s) {
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StringBuffer sb = new StringBuffer();
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int i=0;
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while (i<s.length()) {
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char c = s.charAt(i);
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char c2, c3;
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if (c != '%') {
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i++;
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} else {
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try {
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c = unescape(s, i);
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i += 3;
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if ((c & 0x80) != 0) {
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switch (c >> 4) {
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case 0xC: case 0xD:
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c2 = unescape(s, i);
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i += 3;
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c = (char)(((c & 0x1f) << 6) | (c2 & 0x3f));
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break;
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case 0xE:
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c2 = unescape(s, i);
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i += 3;
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c3 = unescape(s, i);
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i += 3;
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c = (char)(((c & 0x0f) << 12) |
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((c2 & 0x3f) << 6) |
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(c3 & 0x3f));
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break;
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default:
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throw new IllegalArgumentException();
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}
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}
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} catch (NumberFormatException e) {
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throw new IllegalArgumentException();
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}
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}
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sb.append(c);
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}
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return sb.toString();
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}
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}
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