Comment 12 for bug 694188

There is already a basic implementation of charset detection implemented in the writer text import as SwIoSystem::IsDetectableText:

http://opengrok.libreoffice.org/xref/writer/sw/source/filter/basflt/iodetect.cxx#427

It old and ugly, but could be a starting point. Obviously, it would have to be moved out of writer and polished a bit so that it can be used in other applications too.