CFileOutputStream.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2019, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include "io-precomp.h"  // Precompiled headers

#include <mrpt/core/exceptions.h>
#include <mrpt/io/CFileOutputStream.h>

using namespace mrpt::io;
using namespace std;

CFileOutputStream::CFileOutputStream(const string& fileName, bool append)
    : m_of()
{
    MRPT_START

    if (!open(fileName, append))
        THROW_EXCEPTION_FMT(
            "Error creating/opening for write file: '%s'", fileName.c_str());

    MRPT_END
}

CFileOutputStream::CFileOutputStream() : m_of() {}
bool CFileOutputStream::open(const string& fileName, bool append)
{
    close();

    // Open for write/append:
    ios_base::openmode openMode = ios_base::binary | ios_base::out;
    if (append) openMode |= ios_base::app;

    m_of.open(fileName.c_str(), openMode);
    return m_of.is_open();
}

void CFileOutputStream::close()
{
    if (m_of.is_open()) m_of.close();
}

CFileOutputStream::~CFileOutputStream() { close(); }
size_t CFileOutputStream::Read(void* Buffer, size_t Count)
{
    MRPT_UNUSED_PARAM(Buffer);
    MRPT_UNUSED_PARAM(Count);
    THROW_EXCEPTION("Trying to read from a write file stream.");
}

size_t CFileOutputStream::Write(const void* Buffer, size_t Count)
{
    if (!m_of.is_open()) return 0;

    m_of.write(static_cast<const char*>(Buffer), Count);
    return m_of.fail() ? 0 : Count;
}

uint64_t CFileOutputStream::Seek(int64_t Offset, CStream::TSeekOrigin Origin)
{
    if (!m_of.is_open()) return 0;

    ofstream::off_type offset = Offset;
    ofstream::seekdir way;

    switch (Origin)
    {
        case sFromBeginning:
            way = ios_base::beg;
            break;
        case sFromCurrent:
            way = ios_base::cur;
            break;
        case sFromEnd:
            way = ios_base::end;
            break;
        default:
            THROW_EXCEPTION("Invalid value for 'Origin'");
    }

    m_of.seekp(offset, way);
    return getPosition();
}

uint64_t CFileOutputStream::getTotalBytesCount() const
{
    if (!fileOpenCorrectly()) return 0;

    auto& f = const_cast<std::ofstream&>(m_of);

    const uint64_t previousPos = f.tellp();
    f.seekp(0, ios_base::end);
    uint64_t fileSize = f.tellp();
    f.seekp(previousPos, ios_base::beg);
    return fileSize;
}

uint64_t CFileOutputStream::getPosition() const
{
    auto& f = const_cast<std::ofstream&>(m_of);
    if (m_of.is_open())
        return f.tellp();
    else
        return 0;
}

bool CFileOutputStream::fileOpenCorrectly() const { return m_of.is_open(); }