| /* |
| * Copyright (C) 2017 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.server.wifi.hotspot2.anqp; |
| |
| import android.net.wifi.WifiSsid; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.net.ProtocolException; |
| import java.nio.BufferUnderflowException; |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * The OSU Providers List vendor specific ANQP Element, |
| * Wi-Fi Alliance Hotspot 2.0 (Release 2) Technical Specification - Version 5.00, |
| * section 4.8. |
| * |
| * Format: |
| * |
| * | OSU SSID Length | OSU SSID | Number of OSU Providers | Provider #1 | ... |
| * 1 variable 1 variable |
| * |
| */ |
| public class HSOsuProvidersElement extends ANQPElement { |
| /** |
| * Maximum length for a SSID. Refer to IEEE 802.11-2012 Section 8.4.2.2 |
| * for more info. |
| */ |
| @VisibleForTesting |
| public static final int MAXIMUM_OSU_SSID_LENGTH = 32; |
| |
| private final WifiSsid mOsuSsid; |
| private final List<OsuProviderInfo> mProviders; |
| |
| @VisibleForTesting |
| public HSOsuProvidersElement(WifiSsid osuSsid, List<OsuProviderInfo> providers) { |
| super(Constants.ANQPElementType.HSOSUProviders); |
| mOsuSsid = osuSsid; |
| mProviders = providers; |
| } |
| |
| /** |
| * Parse a HSOsuProvidersElement from the given buffer. |
| * |
| * @param payload The buffer to read from |
| * @return {@link HSOsuProvidersElement} |
| * @throws BufferUnderflowException |
| * @throws ProtocolException |
| */ |
| public static HSOsuProvidersElement parse(ByteBuffer payload) |
| throws ProtocolException { |
| int ssidLength = payload.get() & 0xFF; |
| if (ssidLength > MAXIMUM_OSU_SSID_LENGTH) { |
| throw new ProtocolException("Invalid SSID length: " + ssidLength); |
| } |
| byte[] ssidBytes = new byte[ssidLength]; |
| payload.get(ssidBytes); |
| |
| int numProviders = payload.get() & 0xFF; |
| List<OsuProviderInfo> providers = new ArrayList<>(); |
| while (numProviders > 0) { |
| providers.add(OsuProviderInfo.parse(payload)); |
| numProviders--; |
| } |
| |
| return new HSOsuProvidersElement(WifiSsid.createFromByteArray(ssidBytes), providers); |
| } |
| |
| public WifiSsid getOsuSsid() { |
| return mOsuSsid; |
| } |
| |
| public List<OsuProviderInfo> getProviders() { |
| return Collections.unmodifiableList(mProviders); |
| } |
| |
| @Override |
| public boolean equals(Object thatObject) { |
| if (this == thatObject) { |
| return true; |
| } |
| if (!(thatObject instanceof HSOsuProvidersElement)) { |
| return false; |
| } |
| HSOsuProvidersElement that = (HSOsuProvidersElement) thatObject; |
| return (mOsuSsid == null ? that.mOsuSsid == null : mOsuSsid.equals(that.mOsuSsid)) |
| && (mProviders == null ? that.mProviders == null |
| : mProviders.equals(that.mProviders)); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(mOsuSsid, mProviders); |
| } |
| |
| @Override |
| public String toString() { |
| return "OSUProviders{" + "mOsuSsid=" + mOsuSsid + ", mProviders=" + mProviders + "}"; |
| } |
| } |