Charles Lamb's Blog

[Update 3/11/08: Google reports

"Issue 200: Adler32 produces different results when calling
update(byte[]) vs update(byte)

http://code.google.com/p/android/issues/detail?id=200



Comment #2 by Brett.Chabot:

This issue has been fixed in the m5 release of the Android SDK.





Issue attribute updates:

    Status: Released"]

In a previous post I mentioned that there was an issue with Adler32 on the Android platform that I encountered when porting JE.  I have verified that this is only present in the Android JVM and not the off-the-shelf Harmony JVM.

FTR, here's the code that shows the problem:

import java.util.zip.Adler32;
import java.util.zip.Checksum;

public class Blort {

    public static void main(String argv[]) {
    Checksum cksum = new Adler32();
    byte[] ba = new byte[] { 1, 2, 3, 4 };
    cksum.update(ba, 0, 2);
    cksum.update(ba, 2, 2);
    System.out.println("cksum 1: " + cksum.getValue());

    cksum = new Adler32();
    cksum.update(ba, 0, 4);
    System.out.println("cksum 2: " + cksum.getValue());
    }
}