/**************************************************************************
* Copyright (c) 2001 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
package java.net;
import java.io.UnsupportedEncodingException;
public class URLDecoder {
private static final String hex="0123456789abcdef";
private static final String HEX="0123456789ABCDEF";
public static String decode(String str) {
int len = str.length();
char c;
// by specifying len we make sure that the StringBuffer doesn't need to grow
// if not to many cases of '%xx' occur we will not waste to much memory
StringBuffer buf = new StringBuffer(len);
for (int i = 0 ; i < len ;) {
c = str.charAt(i++);
if (c == '+') {
buf.append(' ');
}
else {
if (c == '%') {
if (i+2 >= len) {
throw new IllegalArgumentException("bad syntax "+str);
}
c = str.charAt(i++);
int ch = hex.indexOf(c);
if(ch == -1) {
ch = HEX.indexOf(c);
}
ch *= 16;
c = str.charAt(i++);
int hlp = hex.indexOf(c);
if(hlp == -1){
hlp = HEX.indexOf(c);
}
if (ch < 0 || hlp == -1) {
throw new IllegalArgumentException("bad syntax "+str);
}
buf.append((char)(hlp+ch));
}
else {
buf.append(c);
}
}
}
return buf.toString();
}
public static String decode(String str, String enc) throws UnsupportedEncodingException {
int len = str.length();
StringBuffer buf = new StringBuffer(len);
for (int i = 0; i < len;) {
char c = str.charAt(i++);
if (c == '+') {
buf.append(' ');
} else {
if (c == '%') {
int pos = buf.length();
while (c == '%') {
if (i + 2 >= len) {
throw new IllegalArgumentException("bad syntax " + str);
}
c = str.charAt(i++);
int ch = hex.indexOf(c);
if (ch == -1) {
ch = HEX.indexOf(c);
}
ch *= 16;
c = str.charAt(i++);
int hlp = hex.indexOf(c);
if (hlp == -1) {
hlp = HEX.indexOf(c);
}
if (ch < 0 || hlp == -1) {
throw new IllegalArgumentException("bad syntax " + str);
}
buf.append((char) (hlp + ch));
}
if(pos < buf.length()) {
int l = buf.length();
byte[] bytes = new byte[l-pos];
for(int j=0; j < bytes.length ; j++) {
bytes[j] = (byte) buf.charAt(pos+j);
}
buf.setLength(pos);
buf.append(new String(bytes,enc));
}
} else {
buf.append(c);
}
}
}
return buf.toString();
}
}