Method resize

Engine/MemoryFile.cpp:293–331

}

void
MemoryFile::resize(size_t new_size)
{
#if defined(__NATRON_UNIX__)
    if (_imp->data) {
        if (::munmap(_imp->data, _imp->size) < 0) {
            std::stringstream ss;
            ss << "MemoryFile EXC : Failed to unmap \"" << _imp->path << "\": " << std::strerror(errno) << " (" << errno << ")";
            throw std::runtime_error( ss.str() );
        }
    }
    if (::ftruncate(_imp->file_handle, new_size) < 0) {
        std::stringstream ss;
        ss << "MemoryFile EXC : Failed to truncate the file \"" << _imp->path << "\": " << std::strerror(errno) << " (" << errno << ")";
        throw std::runtime_error( ss.str() );
    }
    _imp->data = static_cast<char*>( ::mmap(
                                         0, new_size, PROT_READ | PROT_WRITE, MAP_SHARED, _imp->file_handle, 0) );
    if (_imp->data == MAP_FAILED) {
        _imp->data = 0;
        std::stringstream ss;
        ss << "MemoryFile EXC : Failed to create mapping of \"" << _imp->path << "\": " << std::strerror(errno) << " (" << errno << ")";
        throw std::runtime_error( ss.str() );
    }

#elif defined(__NATRON_WIN32__)
    ::UnmapViewOfFile(_imp->data);
    ::CloseHandle(_imp->file_mapping_handle);
    _imp->file_mapping_handle = ::CreateFileMapping(
        _imp->file_handle, 0, PAGE_READWRITE, 0, new_size, 0);
    _imp->data = static_cast<char*>( ::MapViewOfFile(
                                         _imp->file_mapping_handle, FILE_MAP_WRITE, 0, 0, 0) );
#endif

    if (!_imp->data) {
        throw std::bad_alloc();
    }
    _imp->size = new_size;
}

void
MemoryFilePrivate::closeMapping(bool drop_pages)