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// URLEncoder.java - Provides a method for encoding strings according to
// application/x-www-form-urlencoded MIME type.
/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.net;
import java.io.UnsupportedEncodingException;
/**
* @author Warren Levy <warrenl@cygnus.com>
* @date April 22, 1999.
*/
/**
* Written using on-line Java Platform 1.2 API Specification, as well
* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
* Status: Believed complete and correct.
*/
public class URLEncoder
{
// This method, per the JCL, is conservative in that it encodes
// some "allowable" characters as % triplets.
public static String encode(String s)
{
// Get the bytes in ISO-Latin-1 (i.e. 8859_1) per the JCL.
// Even though it is the default in most cases, it's specified here
// just in case System.getProperty("file.encoding") is not "8859_1".
String result = "";
try
{
byte[] buf = s.getBytes("8859_1");
int start = 0;
for (int i = 0; i < buf.length; i++)
// For efficiency, check the byte in order of most likely
// possibility so as to minimize the number of comparisons.
// Hence, exclude all the alphanumeric & allowed special chars first.
if ((buf[i] >= 'a' && buf[i] <= 'z') ||
(buf[i] >= 'A' && buf[i] <= 'Z') ||
(buf[i] >= '0' && buf[i] <= '9') ||
buf[i] == '-' || buf[i] == '_' || buf[i] == '.' || buf[i] == '*')
; // This is the most likely case so exclude first for efficiency.
else if (buf[i] == ' ')
buf[i] = (byte) '+'; // Replace space char with plus symbol.
else
{
result = result + new String(buf, start, i - start, "8859_1") +
"%" + Integer.toHexString(((int) buf[i]) & 0xFF);
start = i + 1;
}
// Append remainder of allowable chars from the string, if any.
if (start < buf.length)
result = result +
new String(buf, start, buf.length - start, "8859_1");
}
catch (UnsupportedEncodingException ex)
{
// This should never happen as "8859_1" is the default encoding.
return s;
}
return result;
}
}
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