awy@concurrent.co.uk (Alan Young) (07/20/90)
Are values in ASN.1 character string types that by default include no Cn sets (e.g. Graphic String) permitted to load a Cn set via an escape sequence? I should appreciate a reference to appropriate defining text. Which of the standard ASN.1 character string types may hold 8-bit character sets?
S.Walton@CS.UCL.AC.UK (Simon Walton) (07/23/90)
> Are values in ASN.1 character string types that by default include no Cn > sets (e.g. Graphic String) permitted to load a Cn set via an escape > sequence? I should appreciate a reference to appropriate defining > text. When using basic encoding rules the representation for GraphicString may contain escape sequences to invoke Cn character sets. NumericString, PrintableString and VisibleString (ISO646String) may not contain escape sequences (or control characters). In ASN.1 the character strings themselves contain no escape sequences, just the actual characters. Use of escape sequences is a matter for the transfer syntax (ie. BER). ISO 2022 defines the use of escape sequences, ISO 2375 together with the International Register of Coded Character Sets defines the characters and their registration numbers. The Register is administrated by ECMA. Simon
nseed@miclon.uucp (Nick) (07/24/90)
In article <19316.648733166@UK.AC.UCL.CS> S.Walton@CS.UCL.AC.UK (Simon Walton) writes:
#> Are values in ASN.1 character string types that by default include no Cn
#> sets (e.g. Graphic String) permitted to load a Cn set via an escape
#> sequence?
#
# When using basic encoding rules the representation for
#GraphicString may contain escape sequences to invoke Cn
#character sets. NumericString, PrintableString and
#VisibleString (ISO646String) may not contain escape sequences
#(or control characters).
It is my understanding that apart from the above, IA5 String types must
also be included in the list of types that may not contain escape
sequences.
Paul
S.Walton@CS.UCL.AC.UK (Simon Walton) (07/25/90)
> In article <19316.648733166@UK.AC.UCL.CS> S.Walton@CS.UCL.AC.UK (Simon Walton ) writes: > #> Are values in ASN.1 character string types that by default include no Cn > #> sets (e.g. Graphic String) permitted to load a Cn set via an escape > #> sequence? . > It is my understanding that apart from the above, IA5 String types must > also be included in the list of types that may not contain escape > sequences. > Paul I agree. I didn't include IA5String in my list because Alan's query was about string types without default Cn values, and IA5String has a default Cn value, but I guess I should have mentioned it anyway. Simon