Hi all,

I’m trying to write out a string, in binary, using Elixir’s <<>> syntax, and am having a dumb moment. I have a requirement where if a template name string isn’t 16 characters long then the remaining bytes must be padded with zeros.

Here is the header I’m trying to write:

┌──────────────────┬───────────┬────────────────┬──────────────────┬───────────┬───────────┐
│       TAG        │ Label Len │ Content Length │   Template Name  │  Contents │ Signature │
├──────────────────┼───────────┼────────────────┼──────────────────┼───────────┼───────────┤
│4x Unsigned Chars │    u16    │      u64       │  16byte char str │           │           │
└──────────────────┴───────────┴────────────────┴──────────────────┴───────────┴───────────┘

What I have so far is:

label_bin =
      <<"TAG1", label_metadata.label_len::16, label_metadata.content_length::64>>

I’m not sure how to write the Template name in the same way as above. Do I need to create another IO structure and just append the 0’s?

Thanks,
Jeramy