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From "Vasily Zakharov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3702) [classlib][luni] Reader and Writer convert characters incorrectly
Date Wed, 18 Apr 2007 19:37:15 GMT
[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

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

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);

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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