Name: vpR10011 Date: 04/20/2001



Specification of the class javax.imageio.stream.ImageOutputStreamImpl says:

"public void writeBits(long bits, int numBits) throws IOException
...
Parameters:
        bits - a long containing the bits to be written, starting with the bit in
        position numBits - 1 down to the least signficant bit.
                                                  ^^ typo copied from the spec.
        numBits - an int between 0 and 64, inclusive.
Throws:
        IllegalArgumentException - if numBits is not between 0 and 64,
        inclusive.
        IOException - if an I/O error occurs."


But writeBits does not throw any exception if numBits is not between 0 and 64.


To reproduce this bug run the following test:
---------------------test.java--------------
import java.io.*;
import javax.imageio.stream.*;

public class test {

    public static void main(String[] argv) {
        OutputStream os = (OutputStream) new ByteArrayOutputStream();
        ImageOutputStreamImpl iosI = (ImageOutputStreamImpl) new MemoryCacheImageOutputStream(os);
        System.out.println("numbits < 0");
        try {
            iosI.writeBits(1L, -1);
            System.out.println("Failed: IllegalArgumentException was expected");
        } catch (IllegalArgumentException e) {
            System.out.println("Passed");
        } catch (Exception e) {
            System.out.println("Failed: unexpected exception " + e);
        }
        System.out.println("numbits > 64");
        try {
            iosI.writeBits(1L, 100);
            System.out.println("Failed: IllegalArgumentException was expected");
        } catch (IllegalArgumentException e) {
            System.out.println("Passed");
        } catch (Exception e) {
            System.out.println("Failed: unexpected exception " + e);
        }
    }
}
-------------------------log----------------
% java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b60)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b60, mixed mode)
% java test
numbits < 0
Failed: IllegalArgumentException was expected
numbits > 64
Failed: IllegalArgumentException was expected



This bug causes failure of the new JCK test
api/javax_imageio/stream/ImageOutputStreamImpl/index.html#write


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