If the C structure was:
struct A
{
unsigned a1:1;
unsigned a2:3;
unsigned a3:4;
unsigned a4:2;
}
Can I use a bit string to represent those fields having more than one bit
representations, instead of boolean members as follows:
A ::= SEQUENCE
{
a1 BIT STRING(SIZE(1)),
a2 BIT STRING(SIZE(3)),
a3 BIT STRING(SIZE(4)),
a4 BIT STRING(SIZE(2))
}
Is there a better way to represent this?
How do I ensure that this data when decoded will result in a "packed" structure ?
Thanks,
Aparna
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 29, 2004 5:40 AM
To: Aparna Kailas (WT01 - EMBEDDED & PRODUCT ENGINEERING SOLUTIONS)
Cc: [EMAIL PROTECTED]
Subject: Re: [ASN.1] C bit fields representation in ASN.1
> How would I be able to represent the following in ASN.1 ?
> C structure:
> struct A
> {
> unsigned a1:1;
> unsigned a2:1;
> unsigned a3:1;
> unsigned a4:1;
> }
A ::= SEQUENCE
{
a1 BOOL,
a2 BOOL,
a3 BOOL,
a4 BOOL
}
> Will the encoding in ASN.1 use any optimization techniques for
> instance representing the struct in a single byte ?
If you use PER, yes.
Saludos,
HoraPe
---
Horacio J. Peņa
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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