private static int tlvEncodedLength(Tlv tlv) {
int length;
switch (tlv.getType()) {
case RESOURCE_VALUE:
case RESOURCE_INSTANCE:
length = tlv.getValue().length;
break;
default:
length = 0;
for (Tlv child : tlv.getChildren()) {
int subLength = tlvEncodedLength(child);
length += tlvEncodedSize(child, subLength);
}
}
return length;
}
private static void encode(Tlv tlv, ByteBuffer b) {
int length;
length = tlvEncodedLength(tlv);
int typeByte;
switch (tlv.getType()) {
case OBJECT_INSTANCE:
typeByte = 0b00_000000;
break;
case RESOURCE_INSTANCE:
typeByte = 0b01_000000;
break;
case MULTIPLE_RESOURCE:
typeByte = 0b10_000000;
break;
case RESOURCE_VALUE:
// encode the value
typeByte = 0b11_000000;
break;
default:
throw new IllegalArgumentException("unknown TLV type : '" + tlv.getType() + "'");
}
// encode identifier length
typeByte |= (tlv.getIdentifier() < MAX_LENGTH_8BIT) ? 0b00_0000 : 0b10_0000;
// type of length
if (length < 8) {
typeByte |= length;
} else if (length < MAX_LENGTH_8BIT) {
typeByte |= 0b0000_1000;
} else if (length < MAX_LENGTH_16BIT) {
typeByte |= 0b0001_0000;
} else {
typeByte |= 0b0001_1000;
}
// fill the buffer
b.put((byte) typeByte);
if (tlv.getIdentifier() < MAX_LENGTH_8BIT) {
b.put((byte) tlv.getIdentifier());
} else {
b.putShort((short) tlv.getIdentifier());
}
// write length
if (length >= 8) {
if (length < MAX_LENGTH_8BIT) {
b.put((byte) length);
} else if (length < MAX_LENGTH_16BIT) {
b.putShort((short) length);
} else {
int msb = (length & 0xFF_00_00) >> 16;
b.put((byte) msb);
b.putShort((short) (length & 0xFF_FF));
typeByte |= 0b0001_1000;
}
}
switch (tlv.getType()) {
case RESOURCE_VALUE:
case RESOURCE_INSTANCE:
b.put(tlv.getValue());
break;
default:
for (Tlv child : tlv.getChildren()) {
encode(child, b);
}
break;
}
}