From alex323 at gmail.com  Sat May 20 08:58:02 2006
From: alex323 at gmail.com (Alex)
Date: Sat, 20 May 2006 08:58:02 -0400
Subject: [OTR-dev] Fragment creation?
Message-ID: <446F125A.20205@gmail.com>

Hello. I was pondering about how I would go about creating fragmented
messages which take into account the size of the header. The header is
variable length as strlen("?OTR,1,3,") != strlen("?OTR,1,20,"). A dirty
way of working it out would be find out how many packets there would be
and then work out how large the headers will be, rework-out how many
headers there will be, then rerework out how many headers, then for each
of those, take into account how long the variable headers add, then
rererework-out... no this is getting nasty. Does anyone know of a
solution to this problem? I want to deviate from the protocol slightly
and make the headers static length. strlen("?OTR,00001,00003,") ==
strlen("?OTR,00001,00020,"). Would this break any current
implementations? Is this necessary?

 - Alex


From ian at cypherpunks.ca  Sat May 20 12:34:58 2006
From: ian at cypherpunks.ca (Ian Goldberg)
Date: Sat, 20 May 2006 12:34:58 -0400
Subject: [OTR-dev] Fragment creation?
In-Reply-To: <446F125A.20205@gmail.com>
References: <446F125A.20205@gmail.com>
Message-ID: <20060520163458.GB8086@smtp.paip.net>

You could more easily just allocate space for the worst case, based on
the length of the message, and if a couple of your fragments are a byte
shorter than others, that's fine.

   - Ian