Re: [boost] [serialization] bug in wide character strings

From: Robert Ramey (ramey_at_[hidden])
Date: 2008-04-17 13:43:22

compare you application with test_simple_class.  This application saves and 
restores
every data type suppported by the compiler/library/platform.  This should
include wstring.

Robert Ramey

Jeffrey Faust wrote:
> We've discovered an issue Boost has writing and reading wide character
> strings (wchar_t* and std::wstrings) to non-wide character file
> streams (std::ifstream and std::ofstream).  The issue stems from the
> fact that
> wide characters are written and read as a sequence of characters (in
> text_oarchive_impl.ipp and text_iarchive_impl.ipp, respectively).  For
> text streams, an EOF character terminates the reading of a file on
> Windows. Some wide characters have EOF (value = 26 decimal) as one of
> the bytes so reading that byte causes early termination of the read.
> We
> have worked around the issue by deriving our own input and output
> archives from text_i|oarchive_impl<Archive> and overriding
> load_override() and save_override for std::wstring and wchar_t*.  Our
> implementation just sequences through the wide characters and writes
> them 1 by 1 as wchar_t to the archive.  This isn't very elegant and is
> even less readable in the file than the current implementation but
> does resolve the problem.
>
> I looked at both Boost 1.34.1 and 1.35 and didn't see a difference in
> the implementation here so I'm assuming 1.35 still has the issue.
> I've
> been working with 1.34.1.  Is this a known issue?  Does 1.35 solve it
> in
> some other subtle way?  Is there a better way that doesn't require us
> to derive our own streams?  If not, is there a more elegant way of
> implementing the reading and writing of wide characters ourselves?
>
> Thanks in advance.
>
> Jeff Faust
>
>
>
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