Quetion regarding crc checks

Dear all,
I am currently working on a gnuradio project and i was wondering if
anybody could please share some information about how crc checks are
made.
As in when one makes a crc32 call from ones python script , in crc.py it
says the following

crc = digital_swig.crc32(s)

and there after it makes a call to _digital_swig.crc32. I dont fully
understand the “behind the scene operation” of “_digital_swig” . I
understand that its a library associated file but its operation is what
i
cannot fully comprehend. Does it help make a call to digital_crc32.cc
file
which has all the underlying code.

I would be awfully obliged if somebody were to spare sometime and help
out
in this regard.

Thanks,
Anay.

On Mon, Jan 30, 2012 at 12:24 PM, anay tuljapurkar <
[email protected]> wrote:

understand that its a library associated file but its operation is what i
cannot fully comprehend. Does it help make a call to digital_crc32.cc file
which has all the underlying code.

I would be awfully obliged if somebody were to spare sometime and help out
in this regard.

Thanks,
Anay.

Anay,
Yes, the CRC is implemented in C++ and wrapped into Python using SWIG.
The
actual Python module is digital_swig (which then gets exposed to the
outside as the ‘digital’ module). The _digital_swig is the library call
made behind the scenes. No one really needs to know anything about that,
though.

So yes, if you are interested in the operation of the CRC block, look at
digtial_crc32.cc in gr-digital/lib.

Tom

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