There seems to be a serious bug here in the spec. 8.21.10 is the clause you
need for UTF8String. Clause 8.21.5 should list UTF8String as a further
exclusion (notice that it does not appear in table 3), and 8.21.3 should
reference 8.21.4, 8.21.5, *and* 8.21.10.
I am afraid this text seems to be a bit of a mess!
(But I think your encoding is correct!)
John L
Eduard Lascu wrote:
I am trying to implement an encoding/decoding function for UTF 8 Strings in
BER. The standard (ITU-T X.690 - 07/2002), clauses 8.21.3 and 8.21.5 explain
that strings (other than UniversalString and BMLString) should be encoded
according to the ISO/IEC 2022 standard. Can anybody here confirm that the
octets for each character should be encoded according to the following
table?
Table 1. UTF-8 encoding
===============================================
bytes bits representation
1 7 0bbbbbbb
2 11 110bbbbb 10bbbbbb
3 16 1110bbbb 10bbbbbb 10bbbbbb
4 21 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
===============================================
Each b represents a bit that can be used to store character data.
Best regards,
Eddie
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Prof John Larmouth
Larmouth T&PDS Ltd
(Training and Protocol Development Services Ltd)
1 Blueberry Road
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Cheshire WA14 3LS
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Tel: +44 161 928 1605 Fax: +44 161 928 8069
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