protected long computeSVUID() throws IOException {
        ByteArrayOutputStream bos;
        DataOutputStream dos = null;
        long svuid = 0;

        try {
            bos = new ByteArrayOutputStream();
            dos = new DataOutputStream(bos);

            /*
             * 1. The class name written using UTF encoding.
             */
            dos.writeUTF(name.replace('/', '.'));

            /*
             * 2. The class modifiers written as a 32-bit integer.
             */
            dos.writeInt(access
                    & (Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL
                            | Opcodes.ACC_INTERFACE | Opcodes.ACC_ABSTRACT));

            /*
             * 3. The name of each interface sorted by name written using UTF
             * encoding.
             */
            Arrays.sort(interfaces);
            for (int i = 0; i < interfaces.length; i++) {
                dos.writeUTF(interfaces[i].replace('/', '.'));
            }

            /*
             * 4. For each field of the class sorted by field name (except
             * private static and private transient fields):
             * 
             * 1. The name of the field in UTF encoding. 2. The modifiers of the
             * field written as a 32-bit integer. 3. The descriptor of the field
             * in UTF encoding
             * 
             * Note that field signatures are not dot separated. Method and
             * constructor signatures are dot separated. Go figure...
             */
            writeItems(svuidFields, dos, false);

            /*
             * 5. If a class initializer exists, write out the following: 1. The
             * name of the method, <clinit>, in UTF encoding. 2. The modifier of
             * the method, java.lang.reflect.Modifier.STATIC, written as a
             * 32-bit integer. 3. The descriptor of the method, ()V, in UTF
             * encoding.
             */
            if (hasStaticInitializer) {
                dos.writeUTF("<clinit>");
                dos.writeInt(Opcodes.ACC_STATIC);
                dos.writeUTF("()V");
            } // if..

            /*
             * 6. For each non-private constructor sorted by method name and
             * signature: 1. The name of the method, <init>, in UTF encoding. 2.
             * The modifiers of the method written as a 32-bit integer. 3. The
             * descriptor of the method in UTF encoding.
             */
            writeItems(svuidConstructors, dos, true);

            /*
             * 7. For each non-private method sorted by method name and
             * signature: 1. The name of the method in UTF encoding. 2. The
             * modifiers of the method written as a 32-bit integer. 3. The
             * descriptor of the method in UTF encoding.
             */
            writeItems(svuidMethods, dos, true);

            dos.flush();

            /*
             * 8. The SHA-1 algorithm is executed on the stream of bytes
             * produced by DataOutputStream and produces five 32-bit values
             * sha[0..4].
             */
            byte[] hashBytes = computeSHAdigest(bos.toByteArray());

            /*
             * 9. The hash value is assembled from the first and second 32-bit
             * values of the SHA-1 message digest. If the result of the message
             * digest, the five 32-bit words H0 H1 H2 H3 H4, is in an array of
             * five int values named sha, the hash value would be computed as
             * follows:
             * 
             * long hash = ((sha[0] >>> 24) & 0xFF) | ((sha[0] >>> 16) & 0xFF) <<
             * 8 | ((sha[0] >>> 8) & 0xFF) << 16 | ((sha[0] >>> 0) & 0xFF) <<
             * 24 | ((sha[1] >>> 24) & 0xFF) << 32 | ((sha[1] >>> 16) & 0xFF) <<
             * 40 | ((sha[1] >>> 8) & 0xFF) << 48 | ((sha[1] >>> 0) & 0xFF) <<
             * 56;
             */
            for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
                svuid = (svuid << 8) | (hashBytes[i] & 0xFF);
            }
        } finally {
            // close the stream (if open)
            if (dos != null) {
                dos.close();
            }
        }

        return svuid;
    }