The decoder detection seems to focus on 2-4 byte encoding. Many times you
will get a text in iso-8859-1
or cp-1250 or other 1 byte encoding and none of this is covered there. I
might not make sense to extend the
decoder if it is not meant for 1 byte encoding. In that case adding the
alternative decoder to contrib would be
a better idea.
BTW, you the best way to do the conversion is probably customization of the
file store method.
In your model you do:
Field("my_file", "upload", autodelete=True, custom_store=store_my_file)
And then implement store_my_file based on the original Field.store method:
http://code.google.com/p/web2py/source/browse/gluon/dal.py#7334
