[kaddressbook] [Bug 338556] New: Kaddressbook (export to .vcf files) does not correctly split long lines

[Juergen Harms]

https://bugs.kde.org/show_bug.cgi?id=338556

            Bug ID: 338556
           Summary: Kaddressbook (export to .vcf files) does not correctly
                    split long lines
           Product: kaddressbook
           Version: 4.13
          Platform: Mageia RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: juergen.harms at unige.ch
                CC: tokoe at kde.org

Created attachment 88422
  --> https://bugs.kde.org/attachment.cgi?id=88422&action=edit
Example of an incorrectly folded addressbook item

Exporting an addressbooks into a .vcf file produces incorrect data when folded
(slit) long lines are written. RFC 822 (and, based on this, RFC2425 and
RFC2426) specify that lines with a length exceeding 75 characters should be
"folded" - splitting off continuation lines - and how this is to be done:

- according to these standards, splitting should be achieved by REPLACING a
whitespace by a <CR>-whitespace sequence

- kaddressbook, rather than replacing a whitespace as specified, simply INSERTS
a <CR> at - apparently - arbitrary places.

As a consequence, addressbook items exported from kaddressbook may contain
wrong additional whitespaces; worse, if such an extraneous whitespace appears
within a string that specifies an UTF-encoded character, importing the
addressbook data into another program will normally fail.

Ordinarily, the length of most addressbook items does not exceed 75 characters
- this problem therefore is unlikely to strike in addressbooks with only
English items (that do not contain characters that require UTF encoding).

But, if adressbook-items contain characters that, on export, produce
UTF-encoded strings, the string representing such items are much longer and
the bug becomes very annoying: it is practically not possible to use
kaddressbook for exporting French or German addressbooks, for instance for
synchronising with tabletts or smart phones.

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