transport/include/hidl/HidlBinderSupport.h - platform/system/libhidl - Git at Google

 /*
  * Copyright (C) 2016 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.
  */

 #ifndef ANDROID_HIDL_BINDER_SUPPORT_H
 #define ANDROID_HIDL_BINDER_SUPPORT_H

 #include <sys/types.h>

 #include <android/hidl/base/1.0/BnHwBase.h>
 #include <android/hidl/base/1.0/IBase.h>
 #include <hidl/HidlSupport.h>
 #include <hidl/HidlTransportUtils.h>
 #include <hidl/MQDescriptor.h>
 #include <hidl/Static.h>
 #include <hwbinder/IBinder.h>
 #include <hwbinder/IPCThreadState.h>
 #include <hwbinder/Parcel.h>
 #include <hwbinder/ProcessState.h>
 // Defines functions for hidl_string, hidl_version, Status, hidl_vec, MQDescriptor,
 // etc. to interact with Parcel.

 namespace android {
 namespace hardware {

 // hidl_binder_death_recipient wraps a transport-independent
 // hidl_death_recipient, and implements the binder-specific
 // DeathRecipient interface.
 struct hidl_binder_death_recipient : IBinder::DeathRecipient {
     hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
             uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base);
     virtual void binderDied(const wp<IBinder>& /*who*/);
     wp<hidl_death_recipient> getRecipient();
 private:
     wp<hidl_death_recipient> mRecipient;
     uint64_t mCookie;
     wp<::android::hidl::base::V1_0::IBase> mBase;
 };

 // ---------------------- hidl_memory

 status_t readEmbeddedFromParcel(const hidl_memory &memory,
         const Parcel &parcel, size_t parentHandle, size_t parentOffset);

 status_t writeEmbeddedToParcel(const hidl_memory &memory,
         Parcel *parcel, size_t parentHandle, size_t parentOffset);

 // ---------------------- hidl_string

 status_t readEmbeddedFromParcel(const hidl_string &string,
         const Parcel &parcel, size_t parentHandle, size_t parentOffset);

 status_t writeEmbeddedToParcel(const hidl_string &string,
         Parcel *parcel, size_t parentHandle, size_t parentOffset);

 // ---------------------- hidl_version

 status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel);

 // Caller is responsible for freeing the returned object.
 hidl_version* readFromParcel(const android::hardware::Parcel& parcel);

 // ---------------------- Status

 // Bear in mind that if the client or service is a Java endpoint, this
 // is not the logic which will provide/interpret the data here.
 status_t readFromParcel(Status *status, const Parcel& parcel);
 status_t writeToParcel(const Status &status, Parcel* parcel);

 // ---------------------- hidl_vec

 template<typename T>
 status_t readEmbeddedFromParcel(
         const hidl_vec<T> &vec,
         const Parcel &parcel,
         size_t parentHandle,
         size_t parentOffset,
         size_t *handle) {
     const void *out;
     return parcel.readNullableEmbeddedBuffer(
             vec.size() * sizeof(T),
             handle,
             parentHandle,
             parentOffset + hidl_vec<T>::kOffsetOfBuffer,
             &out);
 }

 template<typename T>
 status_t writeEmbeddedToParcel(
         const hidl_vec<T> &vec,
         Parcel *parcel,
         size_t parentHandle,
         size_t parentOffset,
         size_t *handle) {
     return parcel->writeEmbeddedBuffer(
             vec.data(),
             sizeof(T) * vec.size(),
             handle,
             parentHandle,
             parentOffset + hidl_vec<T>::kOffsetOfBuffer);
 }

 template<typename T>
 status_t findInParcel(const hidl_vec<T> &vec, const Parcel &parcel, size_t *handle) {
     return parcel.quickFindBuffer(vec.data(), handle);
 }

 // ---------------------- MQDescriptor

 template<typename T, MQFlavor flavor>
 ::android::status_t readEmbeddedFromParcel(
         MQDescriptor<T, flavor> &obj,
         const ::android::hardware::Parcel &parcel,
         size_t parentHandle,
         size_t parentOffset) {
     ::android::status_t _hidl_err = ::android::OK;

     size_t _hidl_grantors_child;

     _hidl_err = ::android::hardware::readEmbeddedFromParcel(
                 obj.grantors(),
                 parcel,
                 parentHandle,
                 parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
                 &_hidl_grantors_child);

     if (_hidl_err != ::android::OK) { return _hidl_err; }

     const native_handle_t *_hidl_mq_handle_ptr;
    _hidl_err = parcel.readNullableEmbeddedNativeHandle(
             parentHandle,
             parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle,
             &_hidl_mq_handle_ptr);

     if (_hidl_err != ::android::OK) { return _hidl_err; }

     return _hidl_err;
 }

 template<typename T, MQFlavor flavor>
 ::android::status_t writeEmbeddedToParcel(
         const MQDescriptor<T, flavor> &obj,
         ::android::hardware::Parcel *parcel,
         size_t parentHandle,
         size_t parentOffset) {
     ::android::status_t _hidl_err = ::android::OK;

     size_t _hidl_grantors_child;

     _hidl_err = ::android::hardware::writeEmbeddedToParcel(
             obj.grantors(),
             parcel,
             parentHandle,
             parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
             &_hidl_grantors_child);

     if (_hidl_err != ::android::OK) { return _hidl_err; }

     _hidl_err = parcel->writeEmbeddedNativeHandle(
             obj.handle(),
             parentHandle,
             parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle);

     if (_hidl_err != ::android::OK) { return _hidl_err; }

     return _hidl_err;
 }

 // ---------------------- pointers for HIDL

 template <typename T>
 static status_t readEmbeddedReferenceFromParcel(
         T const* * /* bufptr */,
         const Parcel & parcel,
         size_t parentHandle,
         size_t parentOffset,
         size_t *handle,
         bool *shouldResolveRefInBuffer
     ) {
     // *bufptr is ignored because, if I am embedded in some
     // other buffer, the kernel should have fixed me up already.
     bool isPreviouslyWritten;
     status_t result = parcel.readEmbeddedReference(
         nullptr, // ignored, not written to bufptr.
         handle,
         parentHandle,
         parentOffset,
         &isPreviouslyWritten);
     // tell caller to run T::readEmbeddedToParcel and
     // T::readEmbeddedReferenceToParcel if necessary.
     // It is not called here because we don't know if these two are valid methods.
     *shouldResolveRefInBuffer = !isPreviouslyWritten;
     return result;
 }

 template <typename T>
 static status_t writeEmbeddedReferenceToParcel(
         T const* buf,
         Parcel *parcel, size_t parentHandle, size_t parentOffset,
         size_t *handle,
         bool *shouldResolveRefInBuffer
         ) {

     if(buf == nullptr) {
         *shouldResolveRefInBuffer = false;
         return parcel->writeEmbeddedNullReference(handle, parentHandle, parentOffset);
     }

     // find whether the buffer exists
     size_t childHandle, childOffset;
     status_t result;
     bool found;

     result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset);

     // tell caller to run T::writeEmbeddedToParcel and
     // T::writeEmbeddedReferenceToParcel if necessary.
     // It is not called here because we don't know if these two are valid methods.
     *shouldResolveRefInBuffer = !found;

     if(result != OK) {
         return result; // bad pointers and length given
     }
     if(!found) { // did not find it.
         return parcel->writeEmbeddedBuffer(buf, sizeof(T), handle,
                 parentHandle, parentOffset);
     }
     // found the buffer. easy case.
     return parcel->writeEmbeddedReference(
             handle,
             childHandle,
             childOffset,
             parentHandle,
             parentOffset);
 }

 template <typename T>
 static status_t readReferenceFromParcel(
         T const* *bufptr,
         const Parcel & parcel,
         size_t *handle,
         bool *shouldResolveRefInBuffer
     ) {
     bool isPreviouslyWritten;
     status_t result = parcel.readReference(reinterpret_cast<void const* *>(bufptr),
             handle, &isPreviouslyWritten);
     // tell caller to run T::readEmbeddedToParcel and
     // T::readEmbeddedReferenceToParcel if necessary.
     // It is not called here because we don't know if these two are valid methods.
     *shouldResolveRefInBuffer = !isPreviouslyWritten;
     return result;
 }

 template <typename T>
 static status_t writeReferenceToParcel(
         T const *buf,
         Parcel * parcel,
         size_t *handle,
         bool *shouldResolveRefInBuffer
     ) {

     if(buf == nullptr) {
         *shouldResolveRefInBuffer = false;
         return parcel->writeNullReference(handle);
     }

     // find whether the buffer exists
     size_t childHandle, childOffset;
     status_t result;
     bool found;

     result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset);

     // tell caller to run T::writeEmbeddedToParcel and
     // T::writeEmbeddedReferenceToParcel if necessary.
     // It is not called here because we don't know if these two are valid methods.
     *shouldResolveRefInBuffer = !found;

     if(result != OK) {
         return result; // bad pointers and length given
     }
     if(!found) { // did not find it.
         return parcel->writeBuffer(buf, sizeof(T), handle);
     }
     // found the buffer. easy case.
     return parcel->writeReference(handle,
         childHandle, childOffset);
 }

 // ---------------------- support for casting interfaces

 // Construct a smallest possible binder from the given interface.
 // If it is remote, then its remote() will be retrieved.
 // Otherwise, the smallest possible BnChild is found where IChild is a subclass of IType
 // and iface is of class IChild. BnChild will be used to wrapped the given iface.
 // Return nullptr if iface is null or any failure.
 template <typename IType,
           typename = std::enable_if_t<std::is_same<details::i_tag, typename IType::_hidl_tag>::value>>
 sp<IBinder> toBinder(sp<IType> iface) {
     IType *ifacePtr = iface.get();
     if (ifacePtr == nullptr) {
         return nullptr;
     }
     if (ifacePtr->isRemote()) {
         return ::android::hardware::IInterface::asBinder(
             static_cast<BpInterface<IType>*>(ifacePtr));
     } else {
         std::string myDescriptor = details::getDescriptor(ifacePtr);
         if (myDescriptor.empty()) {
             // interfaceDescriptor fails
             return nullptr;
         }

         // for get + set
         std::unique_lock<std::mutex> _lock = details::gBnMap.lock();

         wp<BHwBinder> wBnObj = details::gBnMap.getLocked(ifacePtr, nullptr);
         sp<IBinder> sBnObj = wBnObj.promote();

         if (sBnObj == nullptr) {
             auto func = details::gBnConstructorMap.get(myDescriptor, nullptr);
             if (!func) {
                 return nullptr;
             }

             sBnObj = sp<IBinder>(func(static_cast<void*>(ifacePtr)));

             if (sBnObj != nullptr) {
                 details::gBnMap.setLocked(ifacePtr, static_cast<BHwBinder*>(sBnObj.get()));
             }
         }

         return sBnObj;
     }
 }

 template <typename IType, typename ProxyType, typename StubType>
 sp<IType> fromBinder(const sp<IBinder>& binderIface) {
     using ::android::hidl::base::V1_0::IBase;
     using ::android::hidl::base::V1_0::BnHwBase;

     if (binderIface.get() == nullptr) {
         return nullptr;
     }
     if (binderIface->localBinder() == nullptr) {
         return new ProxyType(binderIface);
     }
     sp<IBase> base = static_cast<BnHwBase*>(binderIface.get())->getImpl();
     if (details::canCastInterface(base.get(), IType::descriptor)) {
         StubType* stub = static_cast<StubType*>(binderIface.get());
         return stub->getImpl();
     } else {
         return nullptr;
     }
 }

 void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin);
 void joinBinderRpcThreadpool();

 }  // namespace hardware
 }  // namespace android


 #endif  // ANDROID_HIDL_BINDER_SUPPORT_H
	/*
	* Copyright (C) 2016 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.
	*/

	#ifndef ANDROID_HIDL_BINDER_SUPPORT_H
	#define ANDROID_HIDL_BINDER_SUPPORT_H

	#include <sys/types.h>

	#include <android/hidl/base/1.0/BnHwBase.h>
	#include <android/hidl/base/1.0/IBase.h>
	#include <hidl/HidlSupport.h>
	#include <hidl/HidlTransportUtils.h>
	#include <hidl/MQDescriptor.h>
	#include <hidl/Static.h>
	#include <hwbinder/IBinder.h>
	#include <hwbinder/IPCThreadState.h>
	#include <hwbinder/Parcel.h>
	#include <hwbinder/ProcessState.h>
	// Defines functions for hidl_string, hidl_version, Status, hidl_vec, MQDescriptor,
	// etc. to interact with Parcel.

	namespace android {
	namespace hardware {

	// hidl_binder_death_recipient wraps a transport-independent
	// hidl_death_recipient, and implements the binder-specific
	// DeathRecipient interface.
	struct hidl_binder_death_recipient : IBinder::DeathRecipient {
	hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
	uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base);
	virtual void binderDied(const wp<IBinder>& /who/);
	wp<hidl_death_recipient> getRecipient();
	private:
	wp<hidl_death_recipient> mRecipient;
	uint64_t mCookie;
	wp<::android::hidl::base::V1_0::IBase> mBase;
	};

	// ---------------------- hidl_memory

	status_t readEmbeddedFromParcel(const hidl_memory &memory,
	const Parcel &parcel, size_t parentHandle, size_t parentOffset);

	status_t writeEmbeddedToParcel(const hidl_memory &memory,
	Parcel *parcel, size_t parentHandle, size_t parentOffset);

	// ---------------------- hidl_string

	status_t readEmbeddedFromParcel(const hidl_string &string,
	const Parcel &parcel, size_t parentHandle, size_t parentOffset);

	status_t writeEmbeddedToParcel(const hidl_string &string,
	Parcel *parcel, size_t parentHandle, size_t parentOffset);

	// ---------------------- hidl_version

	status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel);

	// Caller is responsible for freeing the returned object.
	hidl_version* readFromParcel(const android::hardware::Parcel& parcel);

	// ---------------------- Status

	// Bear in mind that if the client or service is a Java endpoint, this
	// is not the logic which will provide/interpret the data here.
	status_t readFromParcel(Status *status, const Parcel& parcel);
	status_t writeToParcel(const Status &status, Parcel* parcel);

	// ---------------------- hidl_vec

	template<typename T>
	status_t readEmbeddedFromParcel(
	const hidl_vec<T> &vec,
	const Parcel &parcel,
	size_t parentHandle,
	size_t parentOffset,
	size_t *handle) {
	const void *out;
	return parcel.readNullableEmbeddedBuffer(
	vec.size() * sizeof(T),
	handle,
	parentHandle,
	parentOffset + hidl_vec<T>::kOffsetOfBuffer,
	&out);
	}

	template<typename T>
	status_t writeEmbeddedToParcel(
	const hidl_vec<T> &vec,
	Parcel *parcel,
	size_t parentHandle,
	size_t parentOffset,
	size_t *handle) {
	return parcel->writeEmbeddedBuffer(
	vec.data(),
	sizeof(T) * vec.size(),
	handle,
	parentHandle,
	parentOffset + hidl_vec<T>::kOffsetOfBuffer);
	}

	template<typename T>
	status_t findInParcel(const hidl_vec<T> &vec, const Parcel &parcel, size_t *handle) {
	return parcel.quickFindBuffer(vec.data(), handle);
	}

	// ---------------------- MQDescriptor

	template<typename T, MQFlavor flavor>
	::android::status_t readEmbeddedFromParcel(
	MQDescriptor<T, flavor> &obj,
	const ::android::hardware::Parcel &parcel,
	size_t parentHandle,
	size_t parentOffset) {
	::android::status_t _hidl_err = ::android::OK;

	size_t _hidl_grantors_child;

	_hidl_err = ::android::hardware::readEmbeddedFromParcel(
	obj.grantors(),
	parcel,
	parentHandle,
	parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
	&_hidl_grantors_child);

	if (_hidl_err != ::android::OK) { return _hidl_err; }

	const native_handle_t *_hidl_mq_handle_ptr;
	_hidl_err = parcel.readNullableEmbeddedNativeHandle(
	parentHandle,
	parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle,
	&_hidl_mq_handle_ptr);

	if (_hidl_err != ::android::OK) { return _hidl_err; }

	return _hidl_err;
	}

	template<typename T, MQFlavor flavor>
	::android::status_t writeEmbeddedToParcel(
	const MQDescriptor<T, flavor> &obj,
	::android::hardware::Parcel *parcel,
	size_t parentHandle,
	size_t parentOffset) {
	::android::status_t _hidl_err = ::android::OK;

	size_t _hidl_grantors_child;

	_hidl_err = ::android::hardware::writeEmbeddedToParcel(
	obj.grantors(),
	parcel,
	parentHandle,
	parentOffset + MQDescriptor<T, flavor>::kOffsetOfGrantors,
	&_hidl_grantors_child);

	if (_hidl_err != ::android::OK) { return _hidl_err; }

	_hidl_err = parcel->writeEmbeddedNativeHandle(
	obj.handle(),
	parentHandle,
	parentOffset + MQDescriptor<T, flavor>::kOffsetOfHandle);

	if (_hidl_err != ::android::OK) { return _hidl_err; }

	return _hidl_err;
	}

	// ---------------------- pointers for HIDL

	template <typename T>
	static status_t readEmbeddedReferenceFromParcel(
	T const* * /* bufptr */,
	const Parcel & parcel,
	size_t parentHandle,
	size_t parentOffset,
	size_t *handle,
	bool *shouldResolveRefInBuffer
	) {
	// *bufptr is ignored because, if I am embedded in some
	// other buffer, the kernel should have fixed me up already.
	bool isPreviouslyWritten;
	status_t result = parcel.readEmbeddedReference(
	nullptr, // ignored, not written to bufptr.
	handle,
	parentHandle,
	parentOffset,
	&isPreviouslyWritten);
	// tell caller to run T::readEmbeddedToParcel and
	// T::readEmbeddedReferenceToParcel if necessary.
	// It is not called here because we don't know if these two are valid methods.
	*shouldResolveRefInBuffer = !isPreviouslyWritten;
	return result;
	}

	template <typename T>
	static status_t writeEmbeddedReferenceToParcel(
	T const* buf,
	Parcel *parcel, size_t parentHandle, size_t parentOffset,
	size_t *handle,
	bool *shouldResolveRefInBuffer
	) {

	if(buf == nullptr) {
	*shouldResolveRefInBuffer = false;
	return parcel->writeEmbeddedNullReference(handle, parentHandle, parentOffset);
	}

	// find whether the buffer exists
	size_t childHandle, childOffset;
	status_t result;
	bool found;

	result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset);

	// tell caller to run T::writeEmbeddedToParcel and
	// T::writeEmbeddedReferenceToParcel if necessary.
	// It is not called here because we don't know if these two are valid methods.
	*shouldResolveRefInBuffer = !found;

	if(result != OK) {
	return result; // bad pointers and length given
	}
	if(!found) { // did not find it.
	return parcel->writeEmbeddedBuffer(buf, sizeof(T), handle,
	parentHandle, parentOffset);
	}
	// found the buffer. easy case.
	return parcel->writeEmbeddedReference(
	handle,
	childHandle,
	childOffset,
	parentHandle,
	parentOffset);
	}

	template <typename T>
	static status_t readReferenceFromParcel(
	T const* *bufptr,
	const Parcel & parcel,
	size_t *handle,
	bool *shouldResolveRefInBuffer
	) {
	bool isPreviouslyWritten;
	status_t result = parcel.readReference(reinterpret_cast<void const* *>(bufptr),
	handle, &isPreviouslyWritten);
	// tell caller to run T::readEmbeddedToParcel and
	// T::readEmbeddedReferenceToParcel if necessary.
	// It is not called here because we don't know if these two are valid methods.
	*shouldResolveRefInBuffer = !isPreviouslyWritten;
	return result;
	}

	template <typename T>
	static status_t writeReferenceToParcel(
	T const *buf,
	Parcel * parcel,
	size_t *handle,
	bool *shouldResolveRefInBuffer
	) {

	if(buf == nullptr) {
	*shouldResolveRefInBuffer = false;
	return parcel->writeNullReference(handle);
	}

	// find whether the buffer exists
	size_t childHandle, childOffset;
	status_t result;
	bool found;

	result = parcel->findBuffer(buf, sizeof(T), &found, &childHandle, &childOffset);

	// tell caller to run T::writeEmbeddedToParcel and
	// T::writeEmbeddedReferenceToParcel if necessary.
	// It is not called here because we don't know if these two are valid methods.
	*shouldResolveRefInBuffer = !found;

	if(result != OK) {
	return result; // bad pointers and length given
	}
	if(!found) { // did not find it.
	return parcel->writeBuffer(buf, sizeof(T), handle);
	}
	// found the buffer. easy case.
	return parcel->writeReference(handle,
	childHandle, childOffset);
	}

	// ---------------------- support for casting interfaces

	// Construct a smallest possible binder from the given interface.
	// If it is remote, then its remote() will be retrieved.
	// Otherwise, the smallest possible BnChild is found where IChild is a subclass of IType
	// and iface is of class IChild. BnChild will be used to wrapped the given iface.
	// Return nullptr if iface is null or any failure.
	template <typename IType,
	typename = std::enable_if_t<std::is_same<details::i_tag, typename IType::_hidl_tag>::value>>
	sp<IBinder> toBinder(sp<IType> iface) {
	IType *ifacePtr = iface.get();
	if (ifacePtr == nullptr) {
	return nullptr;
	}
	if (ifacePtr->isRemote()) {
	return ::android::hardware::IInterface::asBinder(
	static_cast<BpInterface<IType>*>(ifacePtr));
	} else {
	std::string myDescriptor = details::getDescriptor(ifacePtr);
	if (myDescriptor.empty()) {
	// interfaceDescriptor fails
	return nullptr;
	}

	// for get + set
	std::unique_lock<std::mutex> _lock = details::gBnMap.lock();

	wp<BHwBinder> wBnObj = details::gBnMap.getLocked(ifacePtr, nullptr);
	sp<IBinder> sBnObj = wBnObj.promote();

	if (sBnObj == nullptr) {
	auto func = details::gBnConstructorMap.get(myDescriptor, nullptr);
	if (!func) {
	return nullptr;
	}

	sBnObj = sp<IBinder>(func(static_cast<void*>(ifacePtr)));

	if (sBnObj != nullptr) {
	details::gBnMap.setLocked(ifacePtr, static_cast<BHwBinder*>(sBnObj.get()));
	}
	}

	return sBnObj;
	}
	}

	template <typename IType, typename ProxyType, typename StubType>
	sp<IType> fromBinder(const sp<IBinder>& binderIface) {
	using ::android::hidl::base::V1_0::IBase;
	using ::android::hidl::base::V1_0::BnHwBase;

	if (binderIface.get() == nullptr) {
	return nullptr;
	}
	if (binderIface->localBinder() == nullptr) {
	return new ProxyType(binderIface);
	}
	sp<IBase> base = static_cast<BnHwBase*>(binderIface.get())->getImpl();
	if (details::canCastInterface(base.get(), IType::descriptor)) {
	StubType* stub = static_cast<StubType*>(binderIface.get());
	return stub->getImpl();
	} else {
	return nullptr;
	}
	}

	void configureBinderRpcThreadpool(size_t maxThreads, bool callerWillJoin);
	void joinBinderRpcThreadpool();

	} // namespace hardware
	} // namespace android


	#endif // ANDROID_HIDL_BINDER_SUPPORT_H