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From "Svetlana Samoilenko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-67) java.nio.charset.Charset.decode(ByteBuffer) throws unexpected BufferOverflowException for UTF-16BE, UTF-16LE, UTF-16 charsets.
Date Wed, 15 Feb 2006 07:30:40 GMT
    [ http://issues.apache.org/jira/browse/HARMONY-67?page=comments#action_12366450 ] 

Svetlana Samoilenko commented on HARMONY-67:
--------------------------------------------

Tim, I confirm that there is no exeption any more, but the result  of decode method  is wrong.
Harnony returns charbuf.length())==1 while BEA returns charbuf.length())==0.
If to set UTF-8 charset, the result is equal.


> java.nio.charset.Charset.decode(ByteBuffer) throws unexpected BufferOverflowException
 for UTF-16BE, UTF-16LE, UTF-16 charsets.
> -------------------------------------------------------------------------------------------------------------------------------
>
>          Key: HARMONY-67
>          URL: http://issues.apache.org/jira/browse/HARMONY-67
>      Project: Harmony
>         Type: Bug
>   Components: Classlib
>     Reporter: Svetlana Samoilenko
>     Assignee: Tim Ellison

>
> According to j2se 1.4.2 specification for Charset.decode(ByteBuffer  b) the method must
not throw any exceptions.
> The test listed below shows that there is unexpected BufferOverflowException thrown if
charset name is one in the following:  UTF-16BE, UTF-16LE, UTF-16.
> BEA does not throw any exceptions.
> Code to reproduce: 
> import java.nio.charset.Charset; 
> import java.nio.ByteBuffer; 
> import java.nio.CharBuffer; 
> public class test2 {   
>     public static void main(String[] args) throws Exception { 
>         byte[] b = new byte[] {(byte)1}; 
>         ByteBuffer buf= ByteBuffer.wrap(b); 
>         CharBuffer charbuf=Charset.forName("UTF-16").decode(buf); 
>         System.out.println("CharBuffer.length()="+ charbuf.length());
>     } 
> }
> Steps to Reproduce: 
> 1. Build Harmony (check-out on 2006-01-30) j2se subset as described in README.txt. 
> 2. Compile test2.java using BEA 1.4 javac 
> > javac -d . test2.java 
> 3. Run java using compatible VM (J9) 
> > java -showversion test2 
> Output: 
> C:\tmp>C:\jrockit-j2sdk1.4.2_04\bin\java.exe -showversion test2 
> java version "1.4.2_04" 
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05) 
> BEA WebLogic JRockit(TM) 1.4.2_04 JVM (build ari-31788-20040616-1132-win-ia32, Native
Threads, GC strategy: parallel) 
> CharBuffer.length()=0
> C:\tmp>C:\harmony\trunk\deploy\jre\bin\java -showversion test2 
> (c) Copyright 1991, 2005 The Apache Software Foundation or its licensors, as applicable.

>  java.nio.BufferOverflowException
>         at java.nio.CharBuffer.put(CharBuffer.java:662) 
>         at java.nio.CharBuffer.put(CharBuffer.java:629) 
>         at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:406) 
>         at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:243) 
>         at java.nio.charset.Charset.decode(Charset.java:630) 
>         at test2.main(test2.java:8)
> Suggested junit test case:
> ------------------------ CharsetTest.java -------------------------------------------------

> import java.nio.charset.Charset; 
> import java.nio.ByteBuffer; 
> import java.nio.CharBuffer; 
> import junit.framework.*; 
> public class CharsetTest extends TestCase { 
>     public static void main(String[] args) { 
>         junit.textui.TestRunner.run(CharsetTest.class); 
>     } 
>     public void test_decode() { 
>         byte[] b = new byte[] {(byte)1}; 
>         ByteBuffer buf= ByteBuffer.wrap(b); 
>         CharBuffer charbuf=Charset.forName("UTF-16").decode(buf); 
>         assertEquals("Assert 0: charset UTF-16",0,charbuf.length());        
>         
>         charbuf=Charset.forName("UTF-16BE").decode(buf); 
>         assertEquals("Assert 1: charset UTF-16BE",0, charbuf.length());        
>         
>         charbuf=Charset.forName("UTF-16LE").decode(buf); 
>         assertEquals("Assert 2: charset UTF16LE",0, charbuf.length());
>     
>    } 
> }

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