"George V. Neville-Neil" <[EMAIL PROTECTED]> writes: > Hi, > > I'm attempting to write a Packet class, and a few other classes for > use in writing protocol conformance tests. For the most part this is > going well except that I'd like to be able to pack and unpack byte > strings with values that are not 8 bit based quantities.
[...] > Thoughts? Well, the main thing that comes to mind is that I wouldn't regard the struct interface as being something totally wonderful and perfect. I am aware of a few attempts to make up a better interface, such as ctypes and Bob's rather similar looking ptypes from macholib: http://svn.red-bean.com/bob/py2app/trunk/src/macholib/ptypes.py and various silly unreleased things I've done. They all work on the basic idea of a class schema that describes the binary structure, eg: class Sound(Message): code = 0x06 layout = [('mask', BYTE()), ('vol', CDI(1, SDI(BYTE(), 1/255.0), 1.0)), ('attenuation', CDI(2, SDI(BYTE(), 1/64.0), 1.0)), ('entitychan', SHORT()), ('soundnum', BYTE()), ('origin', COORD()*3)] You may want to do something similar (presumably the struct module or some other c stuff would be under the hood somewhere). I don't really see a need to change CPython here, unless some general binary parsing scheme becomes best-of-breed and a candidate for stdlib inclusion. Cheers, mwh PS: This is probably more comp.lang.python material. -- The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offence. -- Edsger W. Dijkstra, SIGPLAN Notices, Volume 17, Number 5 _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
