readZip64FileExtents

fn readZip64FileExtents(comptime T: type, header: T, extents: *FileExtents, data: []u8) !void {
    var data_offset: usize = 0;
    if (isMaxInt(header.uncompressed_size)) {
        if (data_offset + 8 > data.len)
            return error.ZipBadCd64Size;
        extents.uncompressed_size = std.mem.readInt(u64, data[data_offset..][0..8], .little);
        data_offset += 8;
    }
    if (isMaxInt(header.compressed_size)) {
        if (data_offset + 8 > data.len)
            return error.ZipBadCd64Size;
        extents.compressed_size = std.mem.readInt(u64, data[data_offset..][0..8], .little);
        data_offset += 8;
    }

    switch (T) {
        CentralDirectoryFileHeader => {
            if (isMaxInt(header.local_file_header_offset)) {
                if (data_offset + 8 > data.len)
                    return error.ZipBadCd64Size;
                extents.local_file_header_offset = std.mem.readInt(u64, data[data_offset..][0..8], .little);
                data_offset += 8;
            }
            if (isMaxInt(header.disk_number)) {
                if (data_offset + 4 > data.len)
                    return error.ZipInvalid;
                const disk_number = std.mem.readInt(u32, data[data_offset..][0..4], .little);
                if (disk_number != 0)
                    return error.ZipMultiDiskUnsupported;
                data_offset += 4;
            }
            if (data_offset > data.len)
                return error.ZipBadCd64Size;
        },
        else => {},
    }
}