Tell us what are you trying to achieve?
If you want some interop over sockets, Java has some standard
classes to do that, no ASN.1 is required.
If you are trying to interact with existing ASN.1 based peers, you
should already have a precise definition for the ASN.1 variant used
by the peer.
So I am a bit puzzled by your intention to code PER for the existing
Java classed. What is the real purpose?
Santiago Conde wrote:
Hi
Thanks for the suggestions but, if I'm not wrong, the compilers work in such a way that you write the ASN syntax and you get the java classes.
My situation is the reverse one. I have a set of java classes and I don't know
how to write the ASN syntax. And this is where my ignorance arise; I don't know
how to put in ASN form the structure that I already have.
Anyway, I'll look for some compiler that could help me with this.
Thanks again
Santiago Conde
Senior Programmer
Kinamik Data Integrity, SL
c/ Diputació 238, Àtic 5ª
08007 Barcelona
Tel. + 34 931 835 814
Fax + 34 933 041 681
-----Original Message-----
From: Conrad Sigona [mailto:[email protected]]
Sent: martes, 09 de junio de 2009 12:50
To: Santiago Conde
Cc: [email protected]
Subject: Re: [Asn1] PER encoding of java hierarchy
I'm a newbie to ASN.1 and I'm trying to do a java implementation using
PER encoding rules.
There are several points that I don't completely understand but the
first thing I'd like to get clear is how can I encode objects that
belong to a hierarchy tree.
In my understanding I need to code the specific class type somewhere so,
when I deserialize the object, I can use the right instantiation
procedure. Can this be done using a CHOICE element? Would be a SEQUENCE
with some extension marker in it?
Sorry if I'm mixing or misunderstaning the way ASN.1 works. Any help
would be greatly appreciated.
Dear Mr. Conde:
I presume you are not writing your own ASN.1 syntax, but are working with
an existing specification. I also presume that you do not seek to write a
general PER encoder, but one specific to the ASN.1 specification you wish
to implement.
If I am right, permit me to suggest that you use an ASN.1 compiler to
convert the ASN.1 syntax to Java and which offers a Java API to access the
data. You will find free packages and commercial (with license fee)
packages. Among the members of this asn1.org group are some people who
work for the companies that write ASN.1 compilers. It is, however, against
asn1.org policy for us to recommend particular packages.
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