/*
* Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.jndi.toolkit.url;
import java.net.MalformedURLException;
import java.io.UnsupportedEncodingException;
/**
* Utilities for dealing with URLs.
* @author Vincent Ryan
*/
final public class UrlUtil {
// To prevent creation of this static class
private UrlUtil() {
}
/**
* Decode a URI string (according to RFC 2396).
*/
public static final String decode(String s) throws MalformedURLException {
try {
return decode(s, "8859_1");
} catch (UnsupportedEncodingException e) {
// ISO-Latin-1 should always be available?
throw new MalformedURLException("ISO-Latin-1 decoder unavailable");
}
}
/**
* Decode a URI string (according to RFC 2396).
*
* Three-character sequences '%xy', where 'xy' is the two-digit
* hexadecimal representation of the lower 8-bits of a character,
* are decoded into the character itself.
*
* The string is subsequently converted using the specified encoding
*/
public static final String decode(String s, String enc)
throws MalformedURLException, UnsupportedEncodingException {
int length = s.length();
byte[] bytes = new byte[length];
int j = 0;
for (int i = 0; i < length; i++) {
if (s.charAt(i) == '%') {
i++; // skip %
try {
bytes[j++] = (byte)
Integer.parseInt(s.substring(i, i + 2), 16);
} catch (Exception e) {
throw new MalformedURLException("Invalid URI encoding: " + s);
}
i++; // skip first hex char; for loop will skip second one
} else {
bytes[j++] = (byte) s.charAt(i);
}
}
return new String(bytes, 0, j, enc);
}
/**
* Encode a string for inclusion in a URI (according to RFC 2396).
*
* Unsafe characters are escaped by encoding them in three-character
* sequences '%xy', where 'xy' is the two-digit hexadecimal representation
* of the lower 8-bits of the character.
*
* The question mark '?' character is also escaped, as required by RFC 2255.
*
* The string is first converted to the specified encoding.
* For LDAP (2255), the encoding must be UTF-8.
*/
public static final String encode(String s, String enc)
throws UnsupportedEncodingException {
byte[] bytes = s.getBytes(enc);
int count = bytes.length;
/*
* From RFC 2396:
*
* mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
* reserved = ";" | "/" | ":" | "?" | "@" | "&" | "=" | "+" | "$" | ","
*/
final String allowed = "=,+;.'-@&/$_()!~*:"; // '?' is omitted
char[] buf = new char[3 * count];
int j = 0;
for (int i = 0; i < count; i++) {
if ((bytes[i] >= 0x61 && bytes[i] <= 0x7A) || // a..z
(bytes[i] >= 0x41 && bytes[i] <= 0x5A) || // A..Z
(bytes[i] >= 0x30 && bytes[i] <= 0x39) || // 0..9
(allowed.indexOf(bytes[i]) >= 0)) {
buf[j++] = (char) bytes[i];
} else {
buf[j++] = '%';
buf[j++] = Character.forDigit(0xF & (bytes[i] >>> 4), 16);
buf[j++] = Character.forDigit(0xF & bytes[i], 16);
}
}
return new String(buf, 0, j);
}
}