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#include <hidl/HidlTransportUtils.h> 18 19#include <android/hidl/base/1.0/IBase.h> 20 21namespace android { 22namespace hardware { 23namespace details { 24 25using ::android::hidl::base::V1_0::IBase; 26 27Return<bool> canCastInterface(IBase* interface, const char* castTo, bool emitError) { 28 if (interface == nullptr) { 29 return false; 30 } 31 32 // b/68217907 33 // Every HIDL interface is a base interface. 34 if (std::string(IBase::descriptor) == castTo) { 35 return true; 36 } 37 38 bool canCast = false; 39 auto chainRet = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) { 40 for (size_t i = 0; i < types.size(); i++) { 41 if (types[i] == castTo) { 42 canCast = true; 43 break; 44 } 45 } 46 }); 47 48 if (!chainRet.isOk()) { 49 // call fails, propagate the error if emitError 50 return emitError 51 ? details::StatusOf<void, bool>(chainRet) 52 : Return<bool>(false); 53 } 54 55 return canCast; 56} 57 58std::string getDescriptor(IBase* interface) { 59 std::string myDescriptor{}; 60 auto ret = interface->interfaceDescriptor([&](const hidl_string &types) { 61 myDescriptor = types.c_str(); 62 }); 63 ret.isOk(); // ignored, return empty string if not isOk() 64 return myDescriptor; 65} 66 67} // namespace details 68} // namespace hardware 69} // namespace android 70