Title: Message
Hi,
First in short the possible ASN.1 descriptions (that comes to my mind) for your
question -
A ::= SEQUENCE
{
a1 BOOLEAN,
a2 BOOLEAN,
a3 BOOLEAN,
a4 BOOLEAN
}
or if your are very
particular about the usage of an integer to represent the same then -
A ::= SEQUENCE
{
a1 INTEGER(0..1),
a2 INTEGER(0..1),
a3 INTEGER(0..1),
a4 INTEGER(0..1)
}
I
would like to add this comment at this point. The bit-fields is a fancy feature
of the C-language, useful to describe data structures with a bit-wise breakup.
Many times the generated code when handling bit-fields is much slower. The
flexibility is provided for cases where its absolutely mandatory to use the
same. I hope such is the requirement you have.
As for the following - "Will the encoding in ASN.1 use any optimization techniques for instance
representing the struct in a single byte ?". There is a differentiation
that we need to be clear about. First hand, the encoding and the structure are
independent. Represention of the structure in 1 byte does not ensure encoding in
a single byte nor vice versa. The data-structure requirements are purely based
on the application implementing the protocol and where it is deployed. The
data-structure representation is left at the mercy of the complier used to
generate the code (structures, encoder and decoder), and the flexibility
provided by the same.
I
believe that you must be aware of this but just in case, PER encoding (as its
name suggests) generates the most packed encoding possible. The data structure
and the length of the encoding does not have any relation at all. Hope this
clears you questions.
Regards
Ramaswamy R
To
deny our instincts, is to deny the very thing that makes us human - Mouse (The
Matrix)
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Hi,
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;
}
Will the encoding
in ASN.1 use any optimization techniques for instance representing the
struct
in a single byte
?
Thanks,
Aparna