Name: vpR10011 Date: 04/19/2001



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

"public int read(byte[] b, int off, int len) throws IOException
    Description copied from interface: ImageInputStream
    Reads one or more bytes from the stream, up to len, and stores them
    into b starting at index off. The number of bytes read is returned. If no
    bytes can be read because the end of the stream has been reached, -1 is
    returned.
...
Returns:
    the number of bytes actually read, or -1 to indicate EOF.
..."


But if the end of the stream has been reached this method returns 0.

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();
        MemoryCacheImageOutputStream mcos = new MemoryCacheImageOutputStream(os);
        byte [] b1 = {1, 2};
        byte [] b2 = new byte[10];
        int t;
        try {
            mcos.write(b1);
            System.out.println("length() = " + mcos.length());
            mcos.seek(0);
            t = mcos.read(b2, 0, b2.length);
            System.out.println("read(byte[], int, int) returns " + t);
            t = mcos.read(b2, 0, b2.length);
            System.out.println("read(byte[], int, int) returns " + t);
            System.out.println( t == -1 ? "Passed" : "Failed");
        } 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
length() = 2
read(byte[], int, int) returns 2
read(byte[], int, int) returns 0
Failed




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