1 /*
2  * Copyright (C) 2016 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 #ifndef ANDROID_HARDWARE_CONVERSION_HELPER_HIDL_H
18 #define ANDROID_HARDWARE_CONVERSION_HELPER_HIDL_H
19 
20 #include PATH(android/hardware/audio/FILE_VERSION/types.h)
21 #include <hidl/HidlSupport.h>
22 #include <system/audio.h>
23 #include <utils/String8.h>
24 #include <utils/String16.h>
25 #include <utils/Vector.h>
26 
27 using ::android::hardware::audio::CPP_VERSION::ParameterValue;
28 using CoreResult = ::android::hardware::audio::CPP_VERSION::Result;
29 
30 using ::android::hardware::Return;
31 using ::android::hardware::hidl_string;
32 using ::android::hardware::hidl_vec;
33 
34 namespace android {
35 namespace CPP_VERSION {
36 
37 class ConversionHelperHidl {
38   protected:
39     static status_t keysFromHal(const String8& keys, hidl_vec<hidl_string> *hidlKeys);
40     static status_t parametersFromHal(const String8& kvPairs, hidl_vec<ParameterValue> *hidlParams);
41     static void parametersToHal(const hidl_vec<ParameterValue>& parameters, String8 *values);
42     static void argsFromHal(const Vector<String16>& args, hidl_vec<hidl_string> *hidlArgs);
43 
44     ConversionHelperHidl(const char* className);
45 
46     template<typename R, typename T>
processReturn(const char * funcName,const Return<R> & ret,T * retval)47     status_t processReturn(const char* funcName, const Return<R>& ret, T *retval) {
48         if (ret.isOk()) {
49             // This way it also works for enum class to unscoped enum conversion.
50             *retval = static_cast<T>(static_cast<R>(ret));
51             return OK;
52         }
53         return processReturn(funcName, ret);
54     }
55 
56     template<typename T>
processReturn(const char * funcName,const Return<T> & ret)57     status_t processReturn(const char* funcName, const Return<T>& ret) {
58         if (!ret.isOk()) {
59             emitError(funcName, ret.description().c_str());
60         }
61         return ret.isOk() ? OK : FAILED_TRANSACTION;
62     }
63 
processReturn(const char * funcName,const Return<CoreResult> & ret)64     status_t processReturn(const char* funcName, const Return<CoreResult>& ret) {
65         if (!ret.isOk()) {
66             emitError(funcName, ret.description().c_str());
67         }
68         return ret.isOk() ? analyzeResult(ret) : FAILED_TRANSACTION;
69     }
70 
71     template<typename T>
processReturn(const char * funcName,const Return<T> & ret,CoreResult retval)72     status_t processReturn(
73             const char* funcName, const Return<T>& ret, CoreResult retval) {
74         if (!ret.isOk()) {
75             emitError(funcName, ret.description().c_str());
76         }
77         return ret.isOk() ? analyzeResult(retval) : FAILED_TRANSACTION;
78     }
79 
80   private:
81     const char* mClassName;
82 
83     static status_t analyzeResult(const CoreResult& result);
84 
85     void emitError(const char* funcName, const char* description);
86 };
87 
88 }  // namespace CPP_VERSION
89 }  // namespace android
90 
91 #endif // ANDROID_HARDWARE_CONVERSION_HELPER_HIDL_H
92