Function FioFOpenFileTar

src/fileio.cpp:223–234

* Opens a file from inside a tar archive. * @param entry The entry to open. * @param[out] filesize If not \c nullptr, size of the opened file. * @return File handle of the opened file, or \c nullptr if the file is not available. * @note The file is read from within the tar file, and may not return \c EOF after reading the whole file. */

 * @note The file is read from within the tar file, and may not return \c EOF after reading the whole file.
 */
static std::optional<FileHandle> FioFOpenFileTar(const TarFileListEntry &entry, size_t *filesize)
{
	auto f = FileHandle::Open(entry.tar_filename, "rb");
	if (!f.has_value()) return std::nullopt;

	if (fseek(*f, entry.position, SEEK_SET) < 0) {
		return std::nullopt;
	}

	if (filesize != nullptr) *filesize = entry.size;
	return f;
}

/**
 * Opens a OpenTTD file somewhere in a personal or global directory.