in.readFully(b);
    assertEquals(-100, b[0]);
    assertEquals(100, b[1]);
    assertEquals(true, in.readBoolean());
    assertEquals(false, in.readBoolean());
    assertEquals(100, in.readByte());
    assertEquals(-100, in.readByte());
    assertEquals(200, in.readUnsignedByte());
    assertEquals('\u6100', in.readChar());
    assertEquals(-12150, in.readShort());
    assertEquals(20675, in.readUnsignedShort());

    in.readFully(b);
    assertEquals(-100, b[0]);
    assertEquals(100, b[1]);
    assertEquals(true, in.readBoolean());
    assertEquals(false, in.readBoolean());
    assertEquals(100, in.readByte());
    assertEquals(-100, in.readByte());
    assertEquals(200, in.readUnsignedByte());
    assertEquals('\u6100', in.readChar());
    assertEquals(-12150, in.readShort());
    assertEquals(20675, in.readUnsignedShort());

            this.decoder = decoder;
            this.payloadReader = payloadReader;
        }

        @Override
        public InterHubMessage read() throws Exception {
            switch (decoder.readByte()) {
                case CHANNEL_MESSAGE:
                    ChannelIdentifier channelId = readChannelId();
                    Object payload = payloadReader.read();

    }

    @Override
    public ComponentSelectionDescriptor read(Decoder decoder) throws IOException {
        ComponentSelectionCause cause = ComponentSelectionCause.values()[decoder.readByte()];
        String desc = decoder.readString();
        String defaultReason = cause.getDefaultReason();
        if (desc.equals(defaultReason)) {
            return componentSelectionDescriptorFactory.newDescriptor(cause);

            int itemOffset = reader.getItem(i);
            // see https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4
            if (itemOffset > 0 && reader.readByte(itemOffset - 1) == 7) {
                // A CONSTANT_Class entry, read the class descriptor
                String classDescriptor = reader.readUTF8(itemOffset, charBuffer);

        return EntryType.values()[decoder.readByte()];
    }

    private static void writeEntryType(Encoder encoder, EntryType type) throws IOException {
        encoder.writeByte((byte) type.ordinal());
    }

    private static FileMetadata.AccessType readAccessType(Decoder decoder) throws IOException {
        return FileMetadata.AccessType.values()[decoder.readByte()];
    }

	}

	if n, err := (&strings.Reader{}).ReadAt(nil, 11); n != 0 || err != io.EOF {
		t.Errorf("ReadAt: got %d, %v; want 0, io.EOF", n, err)
	}

	if b, err := (&strings.Reader{}).ReadByte(); b != 0 || err != io.EOF {
		t.Errorf("ReadByte: got %d, %v; want 0, io.EOF", b, err)
	}

	if ch, size, err := (&strings.Reader{}).ReadRune(); ch != 0 || size != 0 || err != io.EOF {

	return z, base, nil
}

func scanSign(r io.ByteScanner) (neg bool, err error) {
	var ch byte
	if ch, err = r.ReadByte(); err != nil {
		return false, err
	}
	switch ch {
	case '-':
		neg = true
	case '+':
		// nothing to do
	default:
		r.UnreadByte()
	}
	return
}

// byteReader is a local wrapper around fmt.ScanState;
// it implements the ByteReader interface.

            encoder.writeString(url.toString());
        }
    }

    @Override
    public VisitableURLClassLoader.Spec read(Decoder decoder) throws Exception {
        byte typeTag = decoder.readByte();
        String name = decoder.readString();
        List<URL> classpath = new ArrayList<>();
        int classpathSize = decoder.readInt();
        for (int i=0; i<classpathSize; i++) {

    private static final byte LOCAL = 1;
    private static final byte FOREIGN = 2;

    @Override
    public BuildIdentifier read(Decoder decoder) throws IOException {
        byte type = decoder.readByte();
        switch (type) {
            case ROOT:
                return DefaultBuildIdentifier.ROOT;
            case LOCAL:
                return new DefaultBuildIdentifier(Path.path(decoder.readString()));