testdata/wireshark_dynamic.emb

# Copyright 2026 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     https://www.apache.org/licenses/LICENSE-2.0
#
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# distributed under the License is distributed on an "AS IS" BASIS,
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-- Fixture exercising the Wireshark Lua back end's conditional fields and
-- variable-length arrays.

[expected_back_ends: "cpp, wireshark"]
[$default byte_order: "BigEndian"]
[(cpp) namespace: "emboss::test::wireshark_dynamic"]
[(wireshark) protocol: "vproto"]
[(wireshark) root: "Message"]
[(wireshark) register_on: "udp.port == 13370"]


enum MsgType:
  -- Type of message.
  PING  = 0
  DATA  = 1
  ERROR = 2


struct Message:
  -- A length-prefixed message with an optional error code.
  0 [+1]      MsgType        msg_type
    -- Message type.
  1 [+1]      UInt           count
    -- Number of payload bytes that follow.
  if msg_type == MsgType.ERROR:
    2 [+2]    UInt           error_code
      -- 16-bit error code, present only for ERROR messages.
  4 [+count]  UInt:8[count]  payload
    -- Variable-length payload, `count` bytes long.