schmidt@indetech.com (Douglas C. Schmidt) (10/06/90)
Hi, I've got a quick ASN.1 question that I hope someone can answer for me. I'm trying to define a bounded array of OCTETs using ASN.1 syntax and I wonder if the following is the ``correct'' way to accomplish this: ---------------------------------------- Foo DEFINITIONS ::= BEGIN Version-number ::= SEQUENCE SIZE (5) OF OCTET END ---------------------------------------- In other words, Version-number defines a type that represents a chunk of space 5 OCTETs in length. Are there other ways of accomplishing the same thing? Thanks, Doug -- ____*_ Douglas C. Schmidt schmidt@indetech.com \ / / Independence Technologies {sun,sharkey,pacbell}!indetech!schmidt \/ / 42705 Lawrence Place FAX: 415 438-2034 \/ Fremont, CA 94538 Voice: 415 438-2023
j.onions@computer-science.nottingham.ac.uk (Julian Onions) (10/08/90)
> I've got a quick ASN.1 question that I hope someone can answer for me. > I'm trying to define a bounded array of OCTETs using ASN.1 syntax and I wonde r > if the following is the ``correct'' way to accomplish this: > > ---------------------------------------- > Foo DEFINITIONS ::= > BEGIN > Version-number ::= SEQUENCE SIZE (5) OF OCTET > END > ---------------------------------------- Nope Firstly there is no such thing as OCTET defined in ASN.1 - OCTET STRING is probably what you meant. In any case, and OCTET STRING is defined as is a string of characters. This means the corrected above would be a sequence of 5 strings - each string of arbitrary length. I think what you want is something more like VersionNumber ::= OCTET STRING (SIZE (1..5)) This says VersionNumber is an OCTET STRING of between 0 and 6 characters long. Hope this helps. Julian.
jpo@computer-science.nottingham.ac.uk (Julian Onions) (10/10/90)
One fixes the array at 5 - the other allows from 1 to 5 elements. Julian.