1 /*
2  * Copyright (C) 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.server.uwb.params;
18 
19 import static com.android.server.uwb.config.CapabilityParam.RADAR_SUPPORT;
20 import static com.android.server.uwb.config.CapabilityParam.RADAR_SWEEP_SAMPLES_SUPPORTED;
21 
22 import com.google.uwb.support.base.Params;
23 import com.google.uwb.support.base.ProtocolVersion;
24 import com.google.uwb.support.radar.RadarParams;
25 import com.google.uwb.support.radar.RadarSpecificationParams;
26 
27 /** Radar decoder */
28 public class RadarDecoder extends TlvDecoder {
29     @Override
getParams(TlvDecoderBuffer tlvs, Class<T> paramsType, ProtocolVersion protocolVersion)30     public <T extends Params> T getParams(TlvDecoderBuffer tlvs, Class<T> paramsType,
31             ProtocolVersion protocolVersion)
32             throws IllegalArgumentException {
33         if (RadarSpecificationParams.class.equals(paramsType)) {
34             return (T) getRadarSpecificationParamsFromTlvBuffer(tlvs);
35         }
36         return null;
37     }
38 
isBitSet(int flags, int mask)39     private static boolean isBitSet(int flags, int mask) {
40         return (flags & mask) != 0;
41     }
42 
getRadarSpecificationParamsFromTlvBuffer( TlvDecoderBuffer tlvs)43     private RadarSpecificationParams getRadarSpecificationParamsFromTlvBuffer(
44             TlvDecoderBuffer tlvs) {
45         RadarSpecificationParams.Builder builder = new RadarSpecificationParams.Builder();
46 
47         byte radarCapabilities = tlvs.getByte(RADAR_SUPPORT);
48         if (isBitSet(radarCapabilities, RADAR_SWEEP_SAMPLES_SUPPORTED)) {
49             builder.addRadarCapability(
50                     RadarParams.RadarCapabilityFlag.HAS_RADAR_SWEEP_SAMPLES_SUPPORT);
51         }
52         return builder.build();
53     }
54 }
55