    const uefi = @import("std").os.uefi;
    const Guid = uefi.Guid;

    pub const HIIHandle = *opaque {};

    /// The header found at the start of each package.
    pub const HIIPackageHeader = packed struct(u32) {
        length: u24,
        type: u8,

        pub const type_all: u8 = 0x0;
        pub const type_guid: u8 = 0x1;
        pub const forms: u8 = 0x2;
        pub const strings: u8 = 0x4;
        pub const fonts: u8 = 0x5;
        pub const images: u8 = 0x6;
        pub const simple_fonsts: u8 = 0x7;
        pub const device_path: u8 = 0x8;
        pub const keyboard_layout: u8 = 0x9;
        pub const animations: u8 = 0xa;
        pub const end: u8 = 0xdf;
        pub const type_system_begin: u8 = 0xe0;
        pub const type_system_end: u8 = 0xff;
    };

    /// The header found at the start of each package list.
    pub const HIIPackageList = extern struct {
        package_list_guid: Guid,

        /// The size of the package list (in bytes), including the header.
        package_list_length: u32,

        // TODO implement iterator

    };

    pub const HIISimplifiedFontPackage = extern struct {
        header: HIIPackageHeader,
        number_of_narrow_glyphs: u16,
        number_of_wide_glyphs: u16,

        pub fn getNarrowGlyphs(self: *HIISimplifiedFontPackage) []NarrowGlyph {
            return @ptrCast([*]NarrowGlyph, @ptrCast([*]u8, self) + @sizeOf(HIISimplifiedFontPackage))[0..self.number_of_narrow_glyphs];
        }
    };

    pub const NarrowGlyphAttributes = packed struct(u8) {
        non_spacing: bool,
        wide: bool,
        _pad: u6 = 0,
    };

    pub const NarrowGlyph = extern struct {
        unicode_weight: u16,
        attributes: NarrowGlyphAttributes,
        glyph_col_1: [19]u8,
    };

    pub const WideGlyphAttributes = packed struct(u8) {
        non_spacing: bool,
        wide: bool,
        _pad: u6 = 0,
    };

    pub const WideGlyph = extern struct {
        unicode_weight: u16,
        attributes: WideGlyphAttributes,
        glyph_col_1: [19]u8,
        glyph_col_2: [19]u8,
        _pad: [3]u8 = [_]u8{0} ** 3,
    };

    pub const HIIStringPackage = extern struct {
        header: HIIPackageHeader,
        hdr_size: u32,
        string_info_offset: u32,
        language_window: [16]u16,
        language_name: u16,
        language: [3]u8,
    };