| /* |
| * Copyright (C) 2013 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.ScanFilter; |
| import android.os.ParcelUuid; |
| |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.UUID; |
| |
| /** |
| * Helper class used to manage advertisement package filters. |
| * |
| * @hide |
| */ |
| /* package */class ScanFilterQueue { |
| public static final int TYPE_DEVICE_ADDRESS = 0; |
| public static final int TYPE_SERVICE_DATA_CHANGED = 1; |
| public static final int TYPE_SERVICE_UUID = 2; |
| public static final int TYPE_SOLICIT_UUID = 3; |
| public static final int TYPE_LOCAL_NAME = 4; |
| public static final int TYPE_MANUFACTURER_DATA = 5; |
| public static final int TYPE_SERVICE_DATA = 6; |
| |
| // Max length is 31 - 3(flags) - 2 (one byte for length and one byte for type). |
| private static final int MAX_LEN_PER_FIELD = 26; |
| |
| // Values defined in bluedroid. |
| private static final byte DEVICE_TYPE_ALL = 2; |
| |
| class Entry { |
| public String address; |
| public byte addr_type; |
| public byte type; |
| public UUID uuid; |
| public UUID uuid_mask; |
| public String name; |
| public int company; |
| public int company_mask; |
| public byte[] data; |
| public byte[] data_mask; |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(address, addr_type, type, uuid, uuid_mask, |
| name, company, company_mask, |
| Arrays.hashCode(data), |
| Arrays.hashCode(data_mask)); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| Entry other = (Entry) obj; |
| return Objects.equals(address, other.address) && |
| addr_type == other.addr_type && type == other.type && |
| Objects.equals(uuid, other.uuid) && |
| Objects.equals(uuid_mask, other.uuid_mask) && |
| Objects.equals(name, other.name) && |
| company == other.company && company_mask == other.company_mask && |
| Objects.deepEquals(data, other.data) && |
| Objects.deepEquals(data_mask, other.data_mask); |
| } |
| } |
| |
| private Set<Entry> mEntries = new HashSet<Entry>(); |
| |
| void addDeviceAddress(String address, byte type) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_DEVICE_ADDRESS; |
| entry.address = address; |
| entry.addr_type = type; |
| mEntries.add(entry); |
| } |
| |
| void addServiceChanged() { |
| Entry entry = new Entry(); |
| entry.type = TYPE_SERVICE_DATA_CHANGED; |
| mEntries.add(entry); |
| } |
| |
| void addUuid(UUID uuid) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_SERVICE_UUID; |
| entry.uuid = uuid; |
| entry.uuid_mask = new UUID(0, 0); |
| mEntries.add(entry); |
| } |
| |
| void addUuid(UUID uuid, UUID uuid_mask) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_SERVICE_UUID; |
| entry.uuid = uuid; |
| entry.uuid_mask = uuid_mask; |
| mEntries.add(entry); |
| } |
| |
| void addSolicitUuid(UUID uuid) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_SOLICIT_UUID; |
| entry.uuid = uuid; |
| mEntries.add(entry); |
| } |
| |
| void addName(String name) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_LOCAL_NAME; |
| entry.name = name; |
| mEntries.add(entry); |
| } |
| |
| void addManufacturerData(int company, byte[] data) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_MANUFACTURER_DATA; |
| entry.company = company; |
| entry.company_mask = 0xFFFF; |
| entry.data = data; |
| entry.data_mask = new byte[data.length]; |
| Arrays.fill(entry.data_mask, (byte) 0xFF); |
| mEntries.add(entry); |
| } |
| |
| void addManufacturerData(int company, int company_mask, byte[] data, byte[] data_mask) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_MANUFACTURER_DATA; |
| entry.company = company; |
| entry.company_mask = company_mask; |
| entry.data = data; |
| entry.data_mask = data_mask; |
| mEntries.add(entry); |
| } |
| |
| void addServiceData(byte[] data, byte[] dataMask) { |
| Entry entry = new Entry(); |
| entry.type = TYPE_SERVICE_DATA; |
| entry.data = data; |
| entry.data_mask = dataMask; |
| mEntries.add(entry); |
| } |
| |
| Entry pop() { |
| if (isEmpty()) { |
| return null; |
| } |
| Iterator<Entry> iterator = mEntries.iterator(); |
| Entry entry = iterator.next(); |
| iterator.remove(); |
| return entry; |
| } |
| |
| boolean isEmpty() { |
| return mEntries.isEmpty(); |
| } |
| |
| void clearUuids() { |
| for (Iterator<Entry> it = mEntries.iterator(); it.hasNext();) { |
| Entry entry = it.next(); |
| if (entry.type == TYPE_SERVICE_UUID) |
| it.remove(); |
| } |
| } |
| |
| void clear() { |
| mEntries.clear(); |
| } |
| |
| /** |
| * Compute feature selection based on the filters presented. |
| */ |
| int getFeatureSelection() { |
| int selc = 0; |
| for (Entry entry : mEntries) { |
| selc |= (1 << entry.type); |
| } |
| return selc; |
| } |
| |
| /** |
| * Add ScanFilter to scan filter queue. |
| */ |
| void addScanFilter(ScanFilter filter) { |
| if (filter == null) |
| return; |
| if (filter.getDeviceName() != null) { |
| addName(filter.getDeviceName()); |
| } |
| if (filter.getDeviceAddress() != null) { |
| addDeviceAddress(filter.getDeviceAddress(), DEVICE_TYPE_ALL); |
| } |
| if (filter.getServiceUuid() != null) { |
| if (filter.getServiceUuidMask() == null) { |
| addUuid(filter.getServiceUuid().getUuid()); |
| } else { |
| addUuid(filter.getServiceUuid().getUuid(), |
| filter.getServiceUuidMask().getUuid()); |
| } |
| } |
| if (filter.getManufacturerData() != null) { |
| if (filter.getManufacturerDataMask() == null) { |
| addManufacturerData(filter.getManufacturerId(), filter.getManufacturerData()); |
| } else { |
| addManufacturerData(filter.getManufacturerId(), 0xFFFF, |
| filter.getManufacturerData(), filter.getManufacturerDataMask()); |
| } |
| } |
| if (filter.getServiceDataUuid() != null && filter.getServiceData() != null) { |
| ParcelUuid serviceDataUuid = filter.getServiceDataUuid(); |
| byte[] serviceData = filter.getServiceData(); |
| byte[] serviceDataMask = filter.getServiceDataMask(); |
| if (serviceDataMask == null) { |
| serviceDataMask = new byte[serviceData.length]; |
| Arrays.fill(serviceDataMask, (byte) 0xFF); |
| } |
| serviceData = concate(serviceDataUuid, serviceData); |
| serviceDataMask = concate(serviceDataUuid, serviceDataMask); |
| if (serviceData != null && serviceDataMask != null) { |
| addServiceData(serviceData, serviceDataMask); |
| } |
| } |
| } |
| |
| private byte[] concate(ParcelUuid serviceDataUuid, byte[] serviceData) { |
| int dataLen = 2 + (serviceData == null ? 0 : serviceData.length); |
| // If data is too long, don't add it to hardware scan filter. |
| if (dataLen > MAX_LEN_PER_FIELD) { |
| return null; |
| } |
| byte[] concated = new byte[dataLen]; |
| // Extract 16 bit UUID value. |
| int uuidValue = BluetoothUuid.getServiceIdentifierFromParcelUuid( |
| serviceDataUuid); |
| // First two bytes are service data UUID in little-endian. |
| concated[0] = (byte) (uuidValue & 0xFF); |
| concated[1] = (byte) ((uuidValue >> 8) & 0xFF); |
| if (serviceData != null) { |
| System.arraycopy(serviceData, 0, concated, 2, serviceData.length); |
| } |
| return concated; |
| } |
| } |