VerifierStream(Manifest man,
    JarEntry je,
    InputStream is,
    JarVerifier jv) throws IOException 
{
            this.is = is;
            this.jv = jv;
            this.mev = new ManifestEntryVerifier(man);
            this.jv.beginEntry(je, mev);
            this.numLeft = je.getSize();
            if (this.numLeft == 0)
                this.jv.update(-1, this.mev);
}

 public int available() throws IOException 
{
            return is.available();
}

 public  void close() throws IOException 
{
            if (is != null)
                is.close();
            is = null;
            mev = null;
            jv = null;
}

 public int read() throws IOException 
{
            if (numLeft  > 0) {
                int b = is.read();
                jv.update(b, mev);
                numLeft--;
                if (numLeft == 0)
                    jv.update(-1, mev);
                return b;
            } else {
                return -1;
            }
}

 public int read(byte[] b,
    int off,
    int len) throws IOException 
{
            if ((numLeft  > 0) && (numLeft <  len)) {
                len = (int)numLeft;
            }
            if (numLeft  > 0) {
                int n = is.read(b, off, len);
                jv.update(n, b, off, len, mev);
                numLeft -= n;
                if (numLeft == 0)
                    jv.update(-1, b, off, len, mev);
                return n;
            } else {
                return -1;
            }
}