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_HIDL_TRANSPORT_UTILS_H
18 #define ANDROID_HIDL_TRANSPORT_UTILS_H
19
20 #include <android/hidl/base/1.0/IBase.h>
21
22 namespace android {
23 namespace hardware {
24 namespace details {
25
26 /*
27 * Verifies the interface chain of 'interface' contains 'castTo'
28 * @param emitError if emitError is false, return Return<bool>{false} on error; if emitError
29 * is true, the Return<bool> object contains the actual error.
30 */
31 inline Return<bool> canCastInterface(::android::hidl::base::V1_0::IBase* interface,
32 const char* castTo, bool emitError = false) {
33 if (interface == nullptr) {
34 return false;
35 }
36
37 bool canCast = false;
38 auto chainRet = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) {
39 for (size_t i = 0; i < types.size(); i++) {
40 if (types[i] == castTo) {
41 canCast = true;
42 break;
43 }
44 }
45 });
46
47 if (!chainRet.isOk()) {
48 // call fails, propagate the error if emitError
49 return emitError
50 ? details::StatusOf<void, bool>(chainRet)
51 : Return<bool>(false);
52 }
53
54 return canCast;
55 }
56
getDescriptor(::android::hidl::base::V1_0::IBase * interface)57 inline std::string getDescriptor(::android::hidl::base::V1_0::IBase* interface) {
58 std::string myDescriptor{};
59 auto ret = interface->interfaceDescriptor([&](const hidl_string &types) {
60 myDescriptor = types.c_str();
61 });
62 ret.isOk(); // ignored, return empty string if not isOk()
63 return myDescriptor;
64 }
65
66 } // namespace details
67 } // namespace hardware
68 } // namespace android
69
70 #endif //ANDROID_HIDL_TRANSPORT_UTILS_H
71