[erlang-questions] Padding a binary to a multiple of 4 bytes
Mon Dec 22 04:51:15 CET 2008
> How about
> pad_to_4(Binary) ->
> case (4 - size(Binary) rem 4) rem 4
> of 0 -> Binary
> ; N -> <<Binary/binary, 0:(N*8)>>
> Tested, works, doesn't copy unless it has to.
While we're at it, let's generalise:
pad_to(Width, Binary) ->
case (Width - size(Binary) rem Width) rem Width
of 0 -> Binary
; N -> <<Binary/binary, 0:(N*8)>>
Now that 64-bit machines are so very common, padding to 8
makes a lot of sense too.
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