Name: rmT116609 Date: 09/22/2004


FULL PRODUCT VERSION :
java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)

java version "1.5.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-rc-b63)
Java HotSpot(TM) Client VM (build 1.5.0-rc-b63, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.8-1.521.smp #1 SMP Thu Sep 2 20:34:09 CEST 2004 i686 i686 i386 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
I could reproduce this on the Windows version too.

A DESCRIPTION OF THE PROBLEM :
The FileChannel#transferFrom throws IllegalArgumentException, when:
 - a custom ReadableByteChannel is used;
 - the count argument (last parameter in the call) is bigger than Integer.MAX_VALUE;

The exception is not thrown if the count is <= Integer.MAX_VALUE.

Looks like a casting problem in the algorithm.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Use the provided test case to reproduce it (needs junit on the classpath):

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It will fail on the second assertion.

ERROR MESSAGES/STACK TRACES THAT OCCUR :

java.lang.IllegalArgumentException
at java.nio.Buffer.limit(Buffer.java:249)
at sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:565)
at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:606)
at TestFileChannel.testTransferFromArbitraryChannel(TestFileChannel.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import junit.framework.TestCase;

import java.io.RandomAccessFile;
import java.io.File;
import java.io.IOException;
import java.nio.channels.ReadableByteChannel;
import java.nio.ByteBuffer;

/**
 * @author <a href="mailto:###@###.###">Csaba Nagy</a>
 * @version $Revision: 1.2 $ $Date: 2004/09/21 09:23:49 $
 */
public class TestFileChannel extends TestCase {

    public void testTransferFromArbitraryChannel() throws Exception {
        final byte[] bytes = "Test arbitrary channel".getBytes();
        ReadableByteChannel srcChannel = new DummyChannel(bytes);
        File test1 = File.createTempFile("test_transfer_from_arbitrary_channel_", ".txt");
        RandomAccessFile file1 = new RandomAccessFile(test1, "rw");
        file1.getChannel().transferFrom(srcChannel, 0, 1000);

        assertEquals(bytes.length, file1.length());

        srcChannel = new DummyChannel(bytes);
        File test2 = File.createTempFile("test_transfer_from_arbitrary_channel_", ".txt");
        RandomAccessFile file2 = new RandomAccessFile(test2, "rw");
        file2.getChannel().transferFrom(srcChannel, 0, Integer.MAX_VALUE + 1L);

        assertEquals(bytes.length, file2.length());

    }


    private static class DummyChannel implements ReadableByteChannel {
        int position = 0;
        private final byte[] bytes;
        public DummyChannel(byte[] bytes) {
            this.bytes = bytes;
        }
        public int read(ByteBuffer dst) throws IOException {
            int count = Math.min(bytes.length - position, dst.remaining());
            dst.put(bytes, position, count);
            position += count;
            return count;
        }
        public void close() {}
        public boolean isOpen() { return true; }
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
use as second parameter values smaller than Integer.MAX_VALUE
(Incident Review ID: 311366)
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