Subj : MsgBase.put_msg_header() failing to save header
To   : Nightfox
From : Digital Man
Date : Mon Aug 15 2016 09:14 pm

  Re: MsgBase.put_msg_header() failing to save header
  By: Nightfox to Digital Man on Mon Aug 15 2016 08:08 pm

 >   Re: MsgBase.put_msg_header() failing to save header
 >   By: Digital Man to Nightfox on Wed Aug 10 2016 22:00:02
 >
 >  > >>> Why might put_msg_header() fail?
 >
 >  > DM>> For a number of reasons. Try printing the msgbase.status and
 >  > DM>> msgbase.error values when whever put_msg_header() fails along with
 >  > DM>> the parameter values you're passing to put_msg_header(), and then
 >  > DM>> share the results here. That'll help to isolate the cause of the
 >  > DM>> error.
 >
 >  >> This is the status and error message I'm getting when it fails to save
 >  >> the message:
 >  >> Status: -101
 >  >> Error: illegal header length increase: 770 (4 blocks) vs 752 (3
 >  >> blocks)
 >
 >  DM> This means that the modified message header requires more storage
 >  DM> (blocks in the *.shd file) than what was allocated for the original
 >  DM> message header. The read header used 752 bytes (3 256-byte blocks) and
 >  DM> the modified header requires 770 bytes (4 256-byte blocks). Setting the
 >  DM> "read" attribute should not increase the storage space for a header at
 >  DM> all, so something else is changing between when you read the header and
 >  DM> when you're attempting to write it.
 >
 > My reader script shouldn't do anything that increases the size of the header
 > before I write it.

If you don't pass 'false' as the 3rd argument to MsgBase.get_msg_header(), some
header fields are expanded (e.g. missing message-IDs created) and some header
fields which are non-existent or blank in the SMB are created in the JS
instance of the header. So like the JS object model doc says:
        "Pass false for the expand_fields argument (default: true) if you will
         be re-writing the header later with put_msg_header()"

                                            digital man

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