Experimental Physics and
Industrial Control System

"Kasemir, Kay via Core-talk" <[email protected]> · Wed, 10 Apr 2019 15:39:37 +0000

From: Bruno Martins <[email protected]>
> Related:  https://epics.anl.gov/core-talk/2018/msg00284.php
Alright, so missing info about size encoding is a known issue.

Also related:
The element count encoding of the search request for the channel names,
  struct {
        int searchInstanceID;
        string channelName;
    } channels[];
},
always seems to use a 2-byte short count, not the usual size encoding.

I assume that's because all implementations currently start with
  short count: 0
and then keep updating the buffer in place:

  short count: 1
  int some_channel_id
  string some_channel_name

  short count: 2
  int some_channel_id
  string some_channel_name
  int some_channel_id
  string some_channel_name

With normal size encoding, once you have count >= 254 you'd have to shift all channel ids and names down to make room for a larger count.

-Kay

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System