/*
 * Copyright (C) 2008 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.
 */

/*
 * Implementation of the user-space ashmem API for devices, which have our
 * ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version,
 * used by the simulator.
 */

#ifndef IPCCOMMUNICATOR_H
#define IPCCOMMUNICATOR_H
#include <memory>

class IPCResult;
class IPCArguments;
class IPCBuffer;
class IPCFutexPageQueue;
class IPCCommunicator {
protected:
    explicit IPCCommunicator(IPCFutexPageQueue* futexPageQueue);
    virtual ~IPCCommunicator();

    std::unique_ptr<IPCResult> assembleResult();
    std::unique_ptr<IPCArguments> assembleArguments();
    std::unique_ptr<IPCBuffer> generateResultBuffer(IPCResult*);
    void doSendBufferOnly(IPCBuffer* buffer);
    uint32_t doReadPackage();
    const char* getBlob();
    void releaseBlob();

private:
    void doSendBufferOnly(const void* data, size_t s);
    size_t doSendBufferPage(const void* data, size_t s, size_t pageSize);
    void doRecvBufferOnly(void* data, size_t s);
    std::unique_ptr<char[]> m_package;
    // weakref to a IPCFutexPageQueue object.
    IPCFutexPageQueue* m_futexPageQueue;
};
#endif /* IPCCOMMUNICATOR_H */