| /* |
| * Copyright (C) 2016 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 com.android.bluetooth.gatt; |
| |
| import android.bluetooth.BluetoothUuid; |
| import android.bluetooth.le.AdvertiseData; |
| import android.os.ParcelUuid; |
| import android.util.Log; |
| |
| import java.io.ByteArrayOutputStream; |
| |
| class AdvertiseHelper { |
| |
| private static final String TAG = "AdvertiseHelper"; |
| |
| private static final int DEVICE_NAME_MAX = 26; |
| |
| private static final int COMPLETE_LIST_16_BIT_SERVICE_UUIDS = 0X03; |
| private static final int COMPLETE_LIST_32_BIT_SERVICE_UUIDS = 0X05; |
| private static final int COMPLETE_LIST_128_BIT_SERVICE_UUIDS = 0X07; |
| private static final int SHORTENED_LOCAL_NAME = 0X08; |
| private static final int COMPLETE_LOCAL_NAME = 0X09; |
| private static final int TX_POWER_LEVEL = 0x0A; |
| private static final int SERVICE_DATA_16_BIT_UUID = 0X16; |
| private static final int SERVICE_DATA_32_BIT_UUID = 0X20; |
| private static final int SERVICE_DATA_128_BIT_UUID = 0X21; |
| private static final int MANUFACTURER_SPECIFIC_DATA = 0XFF; |
| |
| public static byte[] advertiseDataToBytes(AdvertiseData data, String name) { |
| |
| if (data == null) { |
| return new byte[0]; |
| } |
| |
| // Flags are added by lower layers of the stack, only if needed; |
| // no need to add them here. |
| |
| ByteArrayOutputStream ret = new ByteArrayOutputStream(); |
| |
| if (data.getIncludeDeviceName()) { |
| try { |
| byte[] nameBytes = name.getBytes("UTF-8"); |
| |
| int nameLength = nameBytes.length; |
| byte type; |
| |
| // TODO(jpawlowski) put a better limit on device name! |
| if (nameLength > DEVICE_NAME_MAX) { |
| nameLength = DEVICE_NAME_MAX; |
| type = SHORTENED_LOCAL_NAME; |
| } else { |
| type = COMPLETE_LOCAL_NAME; |
| } |
| |
| ret.write(nameLength + 1); |
| ret.write(type); |
| ret.write(nameBytes, 0, nameLength); |
| } catch (java.io.UnsupportedEncodingException e) { |
| Log.e(TAG, "Can't include name - encoding error!", e); |
| } |
| } |
| |
| for (int i = 0; i < data.getManufacturerSpecificData().size(); i++) { |
| int manufacturerId = data.getManufacturerSpecificData().keyAt(i); |
| |
| byte[] manufacturerData = data.getManufacturerSpecificData().get(manufacturerId); |
| int dataLen = 2 + (manufacturerData == null ? 0 : manufacturerData.length); |
| byte[] concated = new byte[dataLen]; |
| // First two bytes are manufacturer id in little-endian. |
| concated[0] = (byte) (manufacturerId & 0xFF); |
| concated[1] = (byte) ((manufacturerId >> 8) & 0xFF); |
| if (manufacturerData != null) { |
| System.arraycopy(manufacturerData, 0, concated, 2, manufacturerData.length); |
| } |
| |
| ret.write(concated.length + 1); |
| ret.write(MANUFACTURER_SPECIFIC_DATA); |
| ret.write(concated, 0, concated.length); |
| } |
| |
| if (data.getIncludeTxPowerLevel()) { |
| ret.write(2 /* Length */); |
| ret.write(TX_POWER_LEVEL); |
| ret.write(0); // lower layers will fill this value. |
| } |
| |
| if (data.getServiceUuids() != null) { |
| ByteArrayOutputStream serviceUuids16 = new ByteArrayOutputStream(); |
| ByteArrayOutputStream serviceUuids32 = new ByteArrayOutputStream(); |
| ByteArrayOutputStream serviceUuids128 = new ByteArrayOutputStream(); |
| |
| for (ParcelUuid parcelUuid : data.getServiceUuids()) { |
| byte[] uuid = BluetoothUuid.uuidToBytes(parcelUuid); |
| |
| if (uuid.length == BluetoothUuid.UUID_BYTES_16_BIT) { |
| serviceUuids16.write(uuid, 0, uuid.length); |
| } else if (uuid.length == BluetoothUuid.UUID_BYTES_32_BIT) { |
| serviceUuids32.write(uuid, 0, uuid.length); |
| } else /*if (uuid.length == BluetoothUuid.UUID_BYTES_128_BIT)*/ { |
| serviceUuids128.write(uuid, 0, uuid.length); |
| } |
| } |
| |
| if (serviceUuids16.size() != 0) { |
| ret.write(serviceUuids16.size() + 1); |
| ret.write(COMPLETE_LIST_16_BIT_SERVICE_UUIDS); |
| ret.write(serviceUuids16.toByteArray(), 0, serviceUuids16.size()); |
| } |
| |
| if (serviceUuids32.size() != 0) { |
| ret.write(serviceUuids32.size() + 1); |
| ret.write(COMPLETE_LIST_32_BIT_SERVICE_UUIDS); |
| ret.write(serviceUuids32.toByteArray(), 0, serviceUuids32.size()); |
| } |
| |
| if (serviceUuids128.size() != 0) { |
| ret.write(serviceUuids128.size() + 1); |
| ret.write(COMPLETE_LIST_128_BIT_SERVICE_UUIDS); |
| ret.write(serviceUuids128.toByteArray(), 0, serviceUuids128.size()); |
| } |
| } |
| |
| if (!data.getServiceData().isEmpty()) { |
| for (ParcelUuid parcelUuid : data.getServiceData().keySet()) { |
| byte[] serviceData = data.getServiceData().get(parcelUuid); |
| |
| byte[] uuid = BluetoothUuid.uuidToBytes(parcelUuid); |
| int uuidLen = uuid.length; |
| |
| int dataLen = uuidLen + (serviceData == null ? 0 : serviceData.length); |
| byte[] concated = new byte[dataLen]; |
| |
| System.arraycopy(uuid, 0, concated, 0, uuidLen); |
| |
| if (serviceData != null) { |
| System.arraycopy(serviceData, 0, concated, uuidLen, serviceData.length); |
| } |
| |
| if (uuid.length == BluetoothUuid.UUID_BYTES_16_BIT) { |
| ret.write(concated.length + 1); |
| ret.write(SERVICE_DATA_16_BIT_UUID); |
| ret.write(concated, 0, concated.length); |
| } else if (uuid.length == BluetoothUuid.UUID_BYTES_32_BIT) { |
| ret.write(concated.length + 1); |
| ret.write(SERVICE_DATA_32_BIT_UUID); |
| ret.write(concated, 0, concated.length); |
| } else /*if (uuid.length == BluetoothUuid.UUID_BYTES_128_BIT)*/ { |
| ret.write(concated.length + 1); |
| ret.write(SERVICE_DATA_128_BIT_UUID); |
| ret.write(concated, 0, concated.length); |
| } |
| } |
| } |
| |
| return ret.toByteArray(); |
| } |
| } |