pub const LoadCommandIterator = struct {
    ncmds: usize,
    buffer: []const u8,
    index: usize = 0,

    pub const LoadCommand = struct {
        hdr: load_command,
        data: []const u8,

        pub fn cmd(lc: LoadCommand) LC {
            return lc.hdr.cmd;
        }

        pub fn cmdsize(lc: LoadCommand) u32 {
            return lc.hdr.cmdsize;
        }

        pub fn cast(lc: LoadCommand, comptime Cmd: type) ?Cmd {
            if (lc.data.len < @sizeOf(Cmd)) return null;
            return @as(*align(1) const Cmd, @ptrCast(lc.data.ptr)).*;
        }

        /// Asserts LoadCommand is of type segment_command_64.
        pub fn getSections(lc: LoadCommand) []align(1) const section_64 {
            const segment_lc = lc.cast(segment_command_64).?;
            if (segment_lc.nsects == 0) return &[0]section_64{};
            const data = lc.data[@sizeOf(segment_command_64)..];
            const sections = @as([*]align(1) const section_64, @ptrCast(data.ptr))[0..segment_lc.nsects];
            return sections;
        }

        /// Asserts LoadCommand is of type dylib_command.
        pub fn getDylibPathName(lc: LoadCommand) []const u8 {
            const dylib_lc = lc.cast(dylib_command).?;
            const data = lc.data[dylib_lc.dylib.name..];
            return mem.sliceTo(data, 0);
        }

        /// Asserts LoadCommand is of type rpath_command.
        pub fn getRpathPathName(lc: LoadCommand) []const u8 {
            const rpath_lc = lc.cast(rpath_command).?;
            const data = lc.data[rpath_lc.path..];
            return mem.sliceTo(data, 0);
        }

        /// Asserts LoadCommand is of type build_version_command.
        pub fn getBuildVersionTools(lc: LoadCommand) []align(1) const build_tool_version {
            const build_lc = lc.cast(build_version_command).?;
            const ntools = build_lc.ntools;
            if (ntools == 0) return &[0]build_tool_version{};
            const data = lc.data[@sizeOf(build_version_command)..];
            const tools = @as([*]align(1) const build_tool_version, @ptrCast(data.ptr))[0..ntools];
            return tools;
        }
    };

    pub fn next(it: *LoadCommandIterator) ?LoadCommand {
        if (it.index >= it.ncmds) return null;

        const hdr = @as(*align(1) const load_command, @ptrCast(it.buffer.ptr)).*;
        const cmd = LoadCommand{
            .hdr = hdr,
            .data = it.buffer[0..hdr.cmdsize],
        };

        it.buffer = it.buffer[hdr.cmdsize..];
        it.index += 1;

        return cmd;
    }
}