SerializableFile.cpp

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// ======================================================================
// \title  SerializableFile.cpp
// \author dinkel
// \brief  cpp file for SerializableFile
//
// \copyright
// Copyright 2009-2016, by the California Institute of Technology.
// ALL RIGHTS RESERVED.  United States Government Sponsorship
// acknowledged.
//
// ======================================================================

#include "Fw/SerializableFile/SerializableFile.hpp"
#include "Fw/Types/Assert.hpp"
#include "Os/File.hpp"

namespace Fw {

SerializableFile::SerializableFile(MemAllocator* allocator, FwSizeType maxSerializedSize)
    : m_allocator(allocator),
      m_recoverable(false),  // for compiler; not used
      m_actualSize(maxSerializedSize),
      m_buffer(static_cast<U8*>(this->m_allocator->allocate(0, m_actualSize, m_recoverable)), m_actualSize) {
    // assert if allocator returns smaller size
    FW_ASSERT(maxSerializedSize == m_actualSize, static_cast<FwAssertArgType>(maxSerializedSize),
              static_cast<FwAssertArgType>(m_actualSize));
    FW_ASSERT(nullptr != m_buffer.getBuffAddr());
}

SerializableFile::~SerializableFile() {
    this->m_allocator->deallocate(0, this->m_buffer.getBuffAddr());
}

SerializableFile::Status SerializableFile::load(const char* fileName, Serializable& serializable) {
    Os::File file;
    Os::File::Status status;
    status = file.open(fileName, Os::File::OPEN_READ);
    if (Os::File::OP_OK != status) {
        return FILE_OPEN_ERROR;
    }

    FwSizeType length = this->m_buffer.getCapacity();
    status = file.read(this->m_buffer.getBuffAddr(), length, Os::File::WaitType::NO_WAIT);
    if (Os::File::OP_OK != status) {
        file.close();
        return FILE_READ_ERROR;
    }
    file.close();

    this->reset();
    SerializeStatus serStatus;
    serStatus = this->m_buffer.setBuffLen(length);
    FW_ASSERT(FW_SERIALIZE_OK == serStatus, serStatus);
    serStatus = serializable.deserializeFrom(this->m_buffer);
    if (FW_SERIALIZE_OK != serStatus) {
        return DESERIALIZATION_ERROR;
    }

    return SerializableFile::OP_OK;
}

SerializableFile::Status SerializableFile::save(const char* fileName, Serializable& serializable) {
    this->reset();
    SerializeStatus serStatus = serializable.serializeTo(this->m_buffer);
    FW_ASSERT(FW_SERIALIZE_OK == serStatus, serStatus);

    Os::File file;
    Os::File::Status status;
    status = file.open(fileName, Os::File::OPEN_WRITE);
    if (Os::File::OP_OK != status) {
        return FILE_OPEN_ERROR;
    }

    FwSizeType length = this->m_buffer.getSize();
    status = file.write(this->m_buffer.getBuffAddr(), length);
    if ((Os::File::OP_OK != status) || (length != this->m_buffer.getSize())) {
        file.close();
        return FILE_WRITE_ERROR;
    }

    file.close();

    return SerializableFile::OP_OK;
}

void SerializableFile::reset() {
    this->m_buffer.resetSer();    
    this->m_buffer.resetDeser();  
}
}  // namespace Fw