}
/**
+ * Parse UUID to bytes. The returned value is shortest representation, a 16-bit, 32-bit or 128-bit UUID,
+ * Note returned value is little endian (Bluetooth).
+ *
+ * @param uuid uuid to parse.
+ * @return shortest representation of {@code uuid} as bytes.
+ * @throws IllegalArgumentException If the {@code uuid} is null.
+ */
+ public static byte[] uuidToBytes(ParcelUuid uuid) {
+ if (uuid == null) {
+ throw new IllegalArgumentException("uuid cannot be null");
+ }
+
+ if (is16BitUuid(uuid)) {
+ byte[] uuidBytes = new byte[UUID_BYTES_16_BIT];
+ int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
+ uuidBytes[0] = (byte)(uuidVal & 0xFF);
+ uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
+ return uuidBytes;
+ }
+
+ if (is32BitUuid(uuid)) {
+ byte[] uuidBytes = new byte[UUID_BYTES_32_BIT];
+ int uuidVal = getServiceIdentifierFromParcelUuid(uuid);
+ uuidBytes[0] = (byte)(uuidVal & 0xFF);
+ uuidBytes[1] = (byte)((uuidVal & 0xFF00) >> 8);
+ uuidBytes[2] = (byte)((uuidVal & 0xFF0000) >> 16);
+ uuidBytes[3] = (byte)((uuidVal & 0xFF000000) >> 24);
+ return uuidBytes;
+ }
+
+ // Construct a 128 bit UUID.
+ long msb = uuid.getUuid().getMostSignificantBits();
+ long lsb = uuid.getUuid().getLeastSignificantBits();
+
+ byte[] uuidBytes = new byte[UUID_BYTES_128_BIT];
+ ByteBuffer buf = ByteBuffer.wrap(uuidBytes).order(ByteOrder.LITTLE_ENDIAN);
+ buf.putLong(8, msb);
+ buf.putLong(0, lsb);
+ return uuidBytes;
+ }
+
+ /**
* Check whether the given parcelUuid can be converted to 16 bit bluetooth uuid.
*
* @param parcelUuid