Add parse method to parse UUID from bytes for 16 bit, 32 bit and 128 bit

import android.os.ParcelUuid;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import java.util.Arrays;

import java.util.HashSet;

import java.util.UUID;

    public static final ParcelUuid BASE_UUID =

            ParcelUuid.fromString("00000000-0000-1000-8000-00805F9B34FB");

    /** Length of bytes for 16 bit UUID */

    public static final int UUID_BYTES_16_BIT = 2;

    /** Length of bytes for 32 bit UUID */

    public static final int UUID_BYTES_32_BIT = 4;

    /** Length of bytes for 128 bit UUID */

    public static final int UUID_BYTES_128_BIT = 16;

    public static final ParcelUuid[] RESERVED_UUIDS = {

        AudioSink, AudioSource, AdvAudioDist, HSP, Handsfree, AvrcpController, AvrcpTarget,

        return (int)value;

    }

    /**

     * Parse UUID from bytes. The {@code uuidBytes} can represent a 16-bit, 32-bit or 128-bit UUID,

     * but the returned UUID is always in 128-bit format.

     * Note UUID is little endian in Bluetooth.

     *

     * @param uuidBytes Byte representation of uuid.

     * @return {@link ParcelUuid} parsed from bytes.

     * @throws IllegalArgumentException If the {@code uuidBytes} cannot be parsed.

     */

    public static ParcelUuid parseUuidFrom(byte[] uuidBytes) {

        if (uuidBytes == null) {

            throw new IllegalArgumentException("uuidBytes cannot be null");

        }

        int length = uuidBytes.length;

        if (length != UUID_BYTES_16_BIT && length != UUID_BYTES_32_BIT &&

                length != UUID_BYTES_128_BIT) {

            throw new IllegalArgumentException("uuidBytes length invalid - " + length);

        }

        // Construct a 128 bit UUID.

        if (length == UUID_BYTES_128_BIT) {

            ByteBuffer buf = ByteBuffer.wrap(uuidBytes).order(ByteOrder.LITTLE_ENDIAN);

            long msb = buf.getLong(8);

            long lsb = buf.getLong(0);

            return new ParcelUuid(new UUID(msb, lsb));

        }

        // For 16 bit and 32 bit UUID we need to convert them to 128 bit value.

        // 128_bit_value = uuid * 2^96 + BASE_UUID

        long shortUuid;

        if (length == UUID_BYTES_16_BIT) {

            shortUuid = uuidBytes[0] & 0xFF;

            shortUuid += (uuidBytes[1] & 0xFF) << 8;

        } else {

            shortUuid = uuidBytes[0] & 0xFF ;

            shortUuid += (uuidBytes[1] & 0xFF) << 8;

            shortUuid += (uuidBytes[2] & 0xFF) << 16;

            shortUuid += (uuidBytes[3] & 0xFF) << 24;

        }

        long msb = BASE_UUID.getUuid().getMostSignificantBits() + (shortUuid << 32);

        long lsb = BASE_UUID.getUuid().getLeastSignificantBits();

        return new ParcelUuid(new UUID(msb, lsb));

    }

    /**

     * Check whether the given parcelUuid can be converted to 16 bit bluetooth uuid.

     *

     * @param parcelUuid

     * @return true if the parcelUuid can be converted to 16 bit uuid, false otherwise.

     */

/*

 * Copyright (C) 2014 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package android.bluetooth;

import android.os.ParcelUuid;

import android.test.suitebuilder.annotation.SmallTest;

import junit.framework.TestCase;

/**

 * Unit test cases for {@link BluetoothUuid}.

 * <p>

 * To run this test, use adb shell am instrument -e class 'android.bluetooth.BluetoothUuidTest' -w

 * 'com.android.bluetooth.tests/android.bluetooth.BluetoothTestRunner'

 */

public class BluetoothUuidTest extends TestCase {

    @SmallTest

    public void testUuidParser() {

        byte[] uuid16 = new byte[] {

                0x0B, 0x11 };

        assertEquals(ParcelUuid.fromString("0000110B-0000-1000-8000-00805F9B34FB"),

                BluetoothUuid.parseUuidFrom(uuid16));

        byte[] uuid32 = new byte[] {

                0x0B, 0x11, 0x33, (byte) 0xFE };

        assertEquals(ParcelUuid.fromString("FE33110B-0000-1000-8000-00805F9B34FB"),

                BluetoothUuid.parseUuidFrom(uuid32));

        byte[] uuid128 = new byte[] {

                0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,

                0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, (byte) 0xFF };

        assertEquals(ParcelUuid.fromString("FF0F0E0D-0C0B-0A09-0807-0060504030201"),

                BluetoothUuid.parseUuidFrom(uuid128));

    }

}