[jdev] base64 line endings

Peter Saint-Andre stpeter at jabber.org
Mon Apr 17 11:30:02 CDT 2006


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I'll add this to my open issues list for JEP-0084...

Norman Rasmussen wrote:
> It seems that JEP-0084 is inadvertently conflicting with itself by
> saying that data must be encoded the RFC 3548 way, and not explicitly
> allowing line feeds.
> 
> So something to add to JEP-0084 v0.8 would be to explicitly allow line feeds.
> 
> JEP-0084: User Avatar refers to RFC 3548 (The Base16, Base32, and
> Base64 Data Encodings), and in Section 2.1 it says:
> 
>    Implementations MUST NOT not add line feeds to base encoded data
>    unless the specification referring to this document explicitly
>    directs base encoders to add line feeds after a specific number of
>    characters.
> 
> In  XML Schemas (http://www.w3.org/TR/xmlschema-2/#base64Binary) it says:
> 
>    For compatibility with older mail gateways, [RFC 2045] suggests
> that base64 data should have lines limited to at most 76 characters in
> length. This line-length limitation is not mandated in the lexical
> forms of base64Binary data and must not be enforced by XML Schema
> processors.
> 
> JEP-0153: vCard-Based Avatars refers to RFC 2045 (Multipurpose
> Internet Mail Extensions), and in Section 6.8 it says:
> 
>    The encoded output stream must be represented in lines of no more
>    than 76 characters each.  All line breaks or other characters not
>    found in Table 1 must be ignored by decoding software.  In base64
>    data, characters other than those in Table 1, line breaks, and other
>    white space probably indicate a transmission error, about which a
>    warning message or even a message rejection might be appropriate
>    under some circumstances.
> 
> --
> - Norman Rasmussen
>  - Email: norman at rasmussen.co.za
>  - Home page: http://norman.rasmussen.co.za/
> 

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