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From "Ruth Cao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3702) [classlib][luni] Reader and Writer convert characters incorrectly
Date Fri, 20 Apr 2007 01:45:16 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490216
] 

Ruth Cao commented on HARMONY-3702:
-----------------------------------

Vasily, thank you for your test file. I've looked into this bug and found it is due to the
different default encoding between RI, IBMVME and DRLVM.

More information can be found at HARMONY-3307: http://issues.apache.org/jira/browse/HARMONY-3307#action_12488642

Thus, IMHO, it might be a non-bug difference for Harmony and RI. How do you think?

> [classlib][luni] Reader and Writer convert characters incorrectly
> -----------------------------------------------------------------
>
>                 Key: HARMONY-3702
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3702
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Vasily Zakharov
>         Attachments: test.dat
>
>
> java.io.Reader converts bytes to characters differently than RI does. Also, java.io.Writer
converts characters to bytes differently than RI does.
> The attached test.dat file contains random test data and must be placed to the current
directory. ReaderTest below reads that file with FileReader and then dumps it to standard
output by converting each character to int. WriterTest reads the test.dat file with FileInputStream,
converts each byte to character by casting and then dumps the resulting characters to standard
output by OutputStreamWriter.
> public class ReaderTest {
>     public static void main(String args[]) throws Exception {
>         char[] buffer = new char[0x100000];
>         java.io.Reader reader = new java.io.FileReader("test.dat");
>         int length = reader.read(buffer, 0, buffer.length);
>         for (int i = 0; i < length; i++) {
>             System.out.println((int) buffer[i]);
>         }
>     }
> }
> public class WriterTest {
>     public static void main(String args[]) throws Exception {
>         byte[] buffer = new byte[0x100000];
>         java.io.InputStream iStream = new java.io.FileInputStream("test.dat");
>         int length = iStream.read(buffer, 0, buffer.length);
>         char[] charBuffer = new char[length];
>         for (int i = 0; i < length; i++) {
>             charBuffer[i] = (char) buffer[i];
>         }
>         java.io.Writer writer = new java.io.OutputStreamWriter(System.out);
>         writer.write(charBuffer, 0, length);
>         writer.close();
>     }
> }
> In both cases, output files on RI and on Harmony are different:
> $ RI/bin/java ReaderTest > reader.ri
> $ HY/bin/java ReaderTest > reader.hy
> $ diff --binary -q reader.ri reader.hy
> Files reader.ri and reader.hy differ
> $ RI/bin/java WriterTest > writer.ri
> $ HY/bin/java WriterTest > writer.hy
> $ diff --binary -q writer.ri writer.hy
> Files writer.ri and writer.hy differ
> My investigations show that the problem is in Reader/Writer, not in InputStream/OutputStream.
Also, I've tried other implementations of Reader/Writer and they share the same problem.
> The problem was discovered on Windows XP/IA-32 but probably affects other platforms too.

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