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The dynamic32 framing function

The dynamic32 peer stream framing function segments the peer stream into binary frames at dynamic byte boundaries inferred from the stream data itself. The function will read a 32bit length value at a specified offset from the stream and treat it as the length of the next segment to be framed.

Configuration

The framing configuration string may be a comma-separated list of options of the form <key>=<value>, containing one or more of the following keys:

  • offset: Set the offset (in bytes) of the 32-bit segment size in the stream, counted from the start of a segment/stream (Default: 0)
  • static: Static amount to add to the segment length, e.g. to account for fixed headers (Default: 0)
  • endian: Set the byte order of the transmitteed size to either big or little (Default: little)

The total size of the segment sent to the Websocket peer can be calculated using the formula

offset + 4 /*32bit size field*/ + static + size field content