How to generate checksum from hex byte using python
Thanks !!!
the following two solutions worked;
checksum = sum(map(ord, b))
or 
checksum = sum(bytearray(b))
/ J
I am creating a Hex file using python and at the end I need to add a checksum that consists of sum of all hex values so that checksum = Byte 0x000000 + Byte 0x000001 +…+ Byte 0x27DAFF (not including this 4 bytes). This checksum shall then be written to buffer at position 0x27DB00-0x27DB03 as unsigned long.
Any good ideas for how to get this done fast, I am running python2.7.
As info of what I am up to I start with creating a buffer using ctypes, then write lots and lots of hex stuff to buffer, then create a cStringIO from buffer and write this string object to a file_obj which happen to be a django http response (i.e. returns the hex file as downloadable file) so any smart things involving the buffer would be appreciated !!! :-)
/ Jens