-----Original Message-----
From: Bujji krishna R B <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: mercredi 12 d�cembre 2001 14:40
Subject: [ASN.1] BER Encoding of Tags of CHOICE data type
>Hello,
>
>I would like to know the BER Encoding of the component accept-types (Choice
>Type) given below.
>
>Is the tag [2] encoded or is it replaced by the EXPLICIT TAG [0].
>
>
>MyHTTP DEFINITIONS AUTOMATIC TAGS ::=
>BEGIN
>
> GetRequest ::= SEQUENCE {
>
> header-only BOOLEAN,
> lock BOOLEAN,
> accept-types AcceptTypes,
> url Url,
> ...
> }
> AcceptTypes ::= CHOICE {
>
> choice1 INTEGER,
> choice2 INTEGER
>
> }
> Url ::= VisibleString (FROM ("a".."z"))
>END
Your module is equivalent to :
MyHTTP DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
GetRequest ::= SEQUENCE {
header-only [0] IMPLICIT BOOLEAN,
lock [1] IMPLICIT BOOLEAN,
accept-types [2] EXPLICIT AcceptTypes,
url [3] IMPLICIT Url,
...
}
AcceptTypes ::= CHOICE {
choice1 [0] IMPLICIT INTEGER,
choice2 [1] IMPLICIT INTEGER
}
Url ::= VisibleString (FROM ("a".."z"))
END
In this case, accepted that you encode the "choice2" alternative, you will
have :
accept-types -> [2][1] IntegerValue
>
>-- Same ASN.1 Specification without AUTOMATIC TAGS
>
>MyHTTP DEFINITIONS ::=
>BEGIN
>
> GetRequest ::= SEQUENCE {
>
> header-only [0] BOOLEAN,
> lock [1] BOOLEAN,
> accept-types [2] AcceptTypes,
> url [3] Url,
> ...
> }
> AcceptTypes ::= [0] EXPLICIT CHOICE {
>
> choice1 [0] IMPLICIT INTEGER,
> choice2 [1] IMPLICIT INTEGER
>
> }
> Url ::= VisibleString (FROM ("a".."z"))
>END
>
>Thanks
>krishna
In this case, accepted that you encode the "choice2" alternative you will
have :
accept-types -> [2][0][1] IntegerValue
HETAULT Pierre-Marie
ATOS ORIGIN
www.atosorigin.com
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