Hi Antoine,
I've found that libffi does support this type, but sadly ctypes and cffi
do
not. Adding to ctypes does not seem to be trivial, since the description
of
an integer type is limited to a single character (q in the case of long
long). q is considered to be a length of 8, whereas what I really want
is
the integer type ll which is correctly considered length of 16.
Aren't you talking about the struct module? In ctypes, it seems it
would be sufficient to add a c_int128 type (and/or c_uint128).
Adding a c_int128 type seems somewhat non trivial though. The
specific-sized c_intX types are assigned to the named equivalents (c_long
etc.). Getting a named type that equates to 128-bit (on OSX at least
anyway) is the problem.
The :
class c_something(_SimpleCData):
_type_ = ?
_check_size(c_something)
The type q seems to relate to long long (quad word?) - but that has a
size of 8 for me. I don't know: what something should be, and what ?
should be.
I am guessing stay away from the long long long schenanigans and just
define c_int128 directly:
class c_int128(_SimpleCData):
_type_ = ?
.. but there still seems to lack a _type_ that will relate to a 128-bit
integer..
OK, it seems that adding a new ? that relates to 128-bit requires the
change to struct module. This seems to be in lib-dynload and is written in
C not python?
Can anyone give me some pointers as to why this has not been added to
date,
and the best line of attack?
Probably because noone needed it until now?
We have a comprehensive guide if you want to contribute a patch:
http://docs.python.org/devguide/
The first step would be to open an enhancement request on the
issue tracker, the discussion will then move on there:
http://bugs.python.org/
(if you want to enhance both the ctypes and struct modules, please open
a separate issue for each)
OK, thanks. I had been put off by the bugs title since this is an
enhancement.. will do.
Regards, Fil.
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