Method unwrap

tools/nitfwrap/NitfWrap.cpp:105–165

void NitfWrap::unwrap()
{
    // Use the NITF reader to get the offset and length
    uint64_t offset, length;
    NitfFileReader reader(m_inputFile);
    reader.open();
    reader.getLasOffset(offset, length);
    reader.close();

    // Open file file and seek to the beginning of the location.
    std::istream *in = FileUtils::openFile(m_inputFile);
    if (!in)
    {
        std::ostringstream oss;

        oss << "Couldn't open input file '" << m_inputFile << "'.";
        throw error(oss.str());
    }
    in->seekg(offset, std::istream::beg);

    // Find out if this is a LAS or BPF file and make the output filename.
    bool compressed;
    BOX3D bounds;
    ILeStream leIn(in);
    IStreamMarker mark(leIn);
    if (verifyLas(leIn, bounds, compressed))
    {
        if (m_outputFile.empty())
        {
            m_outputFile = FileUtils::stem(m_inputFile);
            m_outputFile += (compressed ? ".laz" : ".las");
        }
    }
    else
    {
        mark.rewind();
        if (verifyBpf(leIn, bounds))
        {
            if (m_outputFile.empty())
                m_outputFile = FileUtils::stem(m_inputFile) + ".bpf";
        }
        else
        {
            std::cerr << "Wrapped file isn't BPF or LAS.\n";
            return;
        }
    }

    uint64_t bufsize = 16;
    std::vector<char> buf(bufsize);
    std::ostream *out = FileUtils::createFile(m_outputFile);
    in->seekg(offset, std::istream::beg);
    while (length)
    {
        size_t size = (std::min)(length, bufsize);
        in->read(buf.data(), size);
        out->write(buf.data(), size);
        length -= size;