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Commit 4648fc3f authored by Jakub Pawlowski's avatar Jakub Pawlowski
Browse files

Add helper method to convert Bluetooth UUID to bytes 

Bug: 30622771
Test: sl4a ConcurrentBleAdvertisingTest
Change-Id: I7f646d1d357c51b82efc504a0e65d868ad363ddb
parent 3b008f09

framework/java/android/bluetooth/BluetoothUuid.java

+42 −0
Original line number Diff line number Diff line
@@ -274,6 +274,48 @@ public final class BluetoothUuid { 
        return new ParcelUuid(new UUID(msb, lsb));

    }



    /**

     * 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.

     *