[xsd-users] Q on Binary Serialization

[Ray Lischner]

ASN.1 PER is a standard, highly packed, binary representation that would work well with Code Synthesis. I haven't implemented it, but I have implemented ASN.1 DER, which is less densely packed. It worked well, but in the end, we decided to use a custom format that falls somewhere in between DER and PER--trying to balance bandwidth and encoding/decoding time.
 
I don't know of any open-source implementations of ASN.1 PER, but I haven't looked hard. There are a couple commercial implementations you could use.
 
Ray Lischner,
Senior Member of Technical Staff
133 National Business Pkwy, Ste 150         t. 443.539.3448
Annapolis Junction, MD 20701                c. 301.377.7390
rlischner at proteus-technologies.com          f. 443.539.3370

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________________________________

From: xsd-users-bounces at codesynthesis.com on behalf of Balasubramanyam, Shivakumar
Sent: Tue 2/19/2008 5:22 PM
To: xsd-users at codesynthesis.com
Subject: [xsd-users] Q on Binary Serialization 



Hi,



I have a question for folks using XSD with custom binary serializers.
Have you seen a need for defining types in XSD that would be serialized
in bits over the wire?





For example, let's say I have a userid that would represent 20 bits in
the wire format. I was thinking, I could define xsd data type called
bits which would have length as the wire format.



So here are two questions,



1.      Anyone else trying to write a serializer that supports bit level
packing?
2.      Any generic XSD datatypes to represent the same?



I was thinking of using the boost libraries in conjunction with the
XSD/Code Synthesis to achieve this

http://www.boost.org/libs/dynamic_bitset/dynamic_bitset.html





This would allow us to define all protocol messages in XSD and generate
code for serialization.





Thanks,

Shiva