pub const MapContext = struct {
    string_bytes: []const u8,

    pub fn hash(self: MapContext, a: File) u32 {
        const a_basename = span(self.string_bytes[@intFromEnum(a.basename)..]);
        return @truncate(Hash.hash(a.directory_index, a_basename));
    }

    pub fn eql(self: MapContext, a: File, b: File, b_index: usize) bool {
        _ = b_index;
        if (a.directory_index != b.directory_index) return false;
        const a_basename = span(self.string_bytes[@intFromEnum(a.basename)..]);
        const b_basename = span(self.string_bytes[@intFromEnum(b.basename)..]);
        return std.mem.eql(u8, a_basename, b_basename);
    }
}