Name: dfR10049 Date: 01/24/2001



URLDecode.decode(st,"UTF-16") works incorrectly on '+' sign. If this sign occures in
the encoded string and the following sequence contains encoded unsafe characters (%xy)
these characters will be decoded incorrectly.

Please see an example demonstrating the bug below:
----------- DecoderTest.java ----------------
import java.net.*;

public class Decoder {

   public static void main(String args[]) {

        boolean passed = true;
        String enc = "UTF-16";
        String strings[] = {
            "\u0100\u0101",
            "\u0100 \u0101",
            "\u0100 \u0101\u0102",
            "\u0100 \u0101 \u0102",
            "\u0100\u0101\u0102",
        };

        try {
             for (int i = 0; i < strings.length; i++) {
                 String encoded = URLEncoder.encode(strings[i], enc);
                 System.out.println("ecnoded: " + encoded);
                 String decoded = URLDecoder.decode(encoded, enc);
                 System.out.print("init: ");
                 printString(strings[i]);
                 System.out.print("decoded: ");
                 printString(decoded);
                 if (strings[i].equals(decoded)) {
                      System.out.println(" - correct - \n");
                 } else {
                      System.out.println(" - incorrect - \n");
                      passed = false;
                 }
             }
        } catch (Exception e) {
            System.out.println(" exception: " + e);
        }

        System.out.println("Test " + (passed ? "passed" : "failed"));
    }

    static void printString(String s) {
         for (int i = 0; i < s.length(); i++) {
              System.out.print((int)s.charAt(i) + " ");
         }
         System.out.println();
    }
}
#----------------- output from the test ----------------------

#> java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b48)
Java HotSpot(TM) Client VM (build 1.4beta-B48, mixed mode)

#> java Decoder
ecnoded: %FF%FE%00%01%01%01
init: 256 257
decoded: 256 257
 - correct -

ecnoded: %FF%FE%00%01+%01%01
init: 256 32 257
decoded: 256 32 65533
 - incorrect -

ecnoded: %FF%FE%00%01+%01%01%02%01
init: 256 32 257 258
decoded: 256 32 65533
 - incorrect -

ecnoded: %FF%FE%00%01+%01%01+%02%01
init: 256 32 257 32 258
decoded: 256 32 65533 32 65533
 - incorrect -

ecnoded: %FF%FE%00%01%01%01%02%01
init: 256 257 258
decoded: 256 257 258
 - correct -

Test failed

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