39 lines
1.5 KiB
OCaml
39 lines
1.5 KiB
OCaml
(*
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* Copyright (c) 2019 Anil Madhavapeddy
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* Copyright (c) 2014 Nicolás Ojeda Bär
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*)
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let try_with_result fn a =
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try Ok (fn a)
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with Macaddr.Parse_error (msg, _) -> Error (`Msg ("Macaddr: " ^ msg))
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let of_cstruct_exn cs =
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if Cstruct.length cs <> 6 then
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raise (Macaddr.Parse_error ("MAC is exactly 6 bytes", Cstruct.to_string cs))
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else Cstruct.to_string cs |> Macaddr.of_octets_exn
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let of_cstruct cs = try_with_result of_cstruct_exn cs
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let write_cstruct_exn (mac : Macaddr.t) cs =
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let len = Cstruct.length cs in
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let mac = Macaddr.to_octets mac in
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if len <> 6 then raise (Macaddr.Parse_error ("MAC is exactly 6 bytes", mac));
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Cstruct.blit_from_string mac 0 cs 0 6
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let to_cstruct ?(allocator = Cstruct.create) mac =
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let cs = allocator 6 in
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write_cstruct_exn mac cs;
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cs
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