Convert between structs

Go does not provide a built-in function to convert between structs; you must manually map fields or use reflection. For most cases, create a new struct and assign values from the source struct to the destination struct fields directly.

func ConvertTarToZip(src tar.Header) zip.FileHeader {
    return zip.FileHeader{
        Name:     src.Name,
        Modified: src.ModTime,
        Mode:     fs.FileMode(src.Mode),
        UncompressedSize64: uint64(src.Size),
    }
}

Go requires you to explicitly copy data from one struct to another because it does not automatically convert between different types. Think of it like moving boxes from one house to another; you must pick up each item and place it in the new location yourself. This ensures you control exactly which data is transferred and how it is formatted.