Method RandomAccessFile

src/random_access_file.cpp:25–46

* Create the RandomAccesFile. * @param filename Name of the file at the disk. * @param subdir The sub directory to search this file in. */

 * @param subdir   The sub directory to search this file in.
 */
RandomAccessFile::RandomAccessFile(std::string_view filename, Subdirectory subdir) : filename(filename)
{
	size_t file_size;
	this->file_handle = FioFOpenFile(filename, "rb", subdir, &file_size);
	if (!this->file_handle.has_value()) UserError("Cannot open file '{}'", filename);

	/* When files are in a tar-file, the begin of the file might not be at 0. */
	long pos = ftell(*this->file_handle);
	if (pos < 0) UserError("Cannot read file '{}'", filename);

	/* Make a note of start and end position for readers who check bounds. */
	this->start_pos = pos;
	this->end_pos = this->start_pos + file_size;

	/* Store the filename without path and extension */
	auto t = filename.rfind(PATHSEPCHAR);
	std::string name_without_path{filename.substr(t != std::string::npos ? t + 1 : 0)};
	this->simplified_filename = name_without_path.substr(0, name_without_path.rfind('.'));
	strtolower(this->simplified_filename);

	this->SeekTo(static_cast<size_t>(pos), SEEK_SET);
}

/**
 * Get the filename of the opened file with the path from the SubDirectory and the extension.