Converter for .BR3, .BR4, .BR5 files produced by BMW music backups. Simply negates all bites. See http://www.1erforum.de/hifi-navi/konvertieren-von-br4-br5-mp3-22678.html.

brConv.d

import std.file;

int main(char[][] args) {
	if (args.length != 2) return 101;

	auto filename  = args[1];
	auto basename  = filename[0 .. $-4];
	auto extension = filename[$-3 .. $];
	if (!exists(filename)) return 102;

	char[] outpname;
	switch (extension) {
		case "BR3":
			outpname = basename ~ "." ~ "mp4";
			break;
		case "BR4":
			outpname = basename ~ "." ~ "mp3";
			break;
		case "BR5":
			outpname = basename ~ "." ~ "wma";
			break;
		default:
			return 103;
	}

	char[] file = cast(char[]) read(filename);
	
	foreach (int i, char c; file) {
		file[i] = c ^ cast(char) 0xFF;
	}

	write(outpname, file);

	return 0;
}