[jcifs] Character Set discussions

Glass, Eric eric.glass at capitalone.com
Tue Feb 4 21:45:13 EST 2003


I think this was discussed previously, but I figured I'd bring it up again
in the interests of pedantry ;).  The SMB URL draft currently specifies the
following with regards to encoding non-ASCII characters in paths:

   NetBIOS names, share names, and the directory paths and filenames
   offered by an SMB server may all contain characters from outside the
   7-bit US-ASCII character set.  Applications MUST support the use of
   the URL escape sequence as described in [RFC2396] to accommodate
   octet values that represent non-US-ASCII characters.

RFC 2396 doesn't appear to address non-ASCII characters; actually, it

   This document does not discuss the issues and recommendation for dealing
   with characters outside of the US-ASCII character set [ASCII]; those
   recommendations are discussed in a separate document.

The "separate document" appears to be RFC 2718, which states:

   When describing URL schemes in which (some of) the elements of the
   URL are actually representations of sequences of characters, care
   should be taken not to introduce unnecessary variety in the ways
   in which characters are encoded into octets and then into URL
   characters.  Unless there is some compelling reason for a
   particular scheme to do otherwise, translating character sequences
   into UTF-8 (RFC 2279) [3] and then subsequently using the %HH
   encoding for unsafe octets is recommended.

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