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/*
* Copyright (C) 2019 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_OS_HIDL_MEMORY_H
#define ANDROID_OS_HIDL_MEMORY_H
#include <jni.h>
#include <hidl/HidlSupport.h>
namespace android {
// A utility class for handling the android.os.HidlMemory class from JNI code.
class JHidlMemory final {
public:
// Convert an android.os.HidlMemory object to its C++ counterpart,
// hardware::hidl_memory.
// No duplication of file descriptors is performed.
// The returned reference is owned by the underlying Java object.
// Returns nullptr if conversion cannot be done.
static const hardware::hidl_memory* fromJava(JNIEnv* env,
jobject jobj);
// Convert a hardware::hidl_memory object to its Java counterpart,
// android.os.HidlMemory.
// No duplication of file descriptors is performed.
// Returns nullptr if conversion cannot be done.
static jobject toJava(JNIEnv* env,
const hardware::hidl_memory& cobj);
~JHidlMemory();
private:
// We store an instance of type JHidlMemory attached to every Java object
// of type HidlMemory, for holding any native context we need. This instance
// will get deleted when finalize() is called on the Java object.
// This method either extracts the native object from the Java object, or
// attached a new one if it doesn't yet exist.
static JHidlMemory* getNativeContext(JNIEnv* env, jobject obj);
// Convert an android.os.HidlMemory object to its C++ counterpart,
// hardware::hidl_memory.
// No duplication of file descriptors is performed.
// IMPORTANT: caller is responsible to native_handle_delete() the handle of the
// returned object. This is due to an underlying limitation of the hidl_handle
// type, where ownership of the handle implies ownership of the fd and we don't
// want the latter.
// Returns nullptr if conversion cannot be done.
static std::unique_ptr<hardware::hidl_memory> javaToNative(JNIEnv* env,
jobject jobj);
std::unique_ptr<hardware::hidl_memory> mObj;
};
int register_android_os_HidlMemory(JNIEnv* env);
} // namespace android
#endif //ANDROID_OS_HIDL_MEMORY_H
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