pub const Guid = extern struct {
    time_low: u32,
    time_mid: u16,
    time_high_and_version: u16,
    clock_seq_high_and_reserved: u8,
    clock_seq_low: u8,
    node: [6]u8,

    /// Format GUID into hexadecimal lowercase xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx format
    pub fn format(
        self: @This(),
        comptime f: []const u8,
        options: std.fmt.FormatOptions,
        writer: anytype,
    ) !void {
        _ = options;
        if (f.len == 0) {
            const fmt = std.fmt.fmtSliceHexLower;

            const time_low = @byteSwap(self.time_low);
            const time_mid = @byteSwap(self.time_mid);
            const time_high_and_version = @byteSwap(self.time_high_and_version);

            return std.fmt.format(writer, "{:0>8}-{:0>4}-{:0>4}-{:0>2}{:0>2}-{:0>12}", .{
                fmt(std.mem.asBytes(&time_low)),
                fmt(std.mem.asBytes(&time_mid)),
                fmt(std.mem.asBytes(&time_high_and_version)),
                fmt(std.mem.asBytes(&self.clock_seq_high_and_reserved)),
                fmt(std.mem.asBytes(&self.clock_seq_low)),
                fmt(std.mem.asBytes(&self.node)),
            });
        } else {
            std.fmt.invalidFmtError(f, self);
        }
    }

    pub fn eql(a: std.os.uefi.Guid, b: std.os.uefi.Guid) bool {
        return a.time_low == b.time_low and
            a.time_mid == b.time_mid and
            a.time_high_and_version == b.time_high_and_version and
            a.clock_seq_high_and_reserved == b.clock_seq_high_and_reserved and
            a.clock_seq_low == b.clock_seq_low and
            std.mem.eql(u8, &a.node, &b.node);
    }
}