[Python-Dev] bitwise operations for bytes and bytearray (original) (raw)

Joe Jevnik jjevnik at quantopian.com
Thu Jan 7 17:39:12 EST 2016

You want to put the xor method in the nb_xor field of the PyNumberMethods structure that lives in the tp_as_number field of the bytes type object. Two things I noticed in a quick pass: you might want to add some type checking around the case where a or b is not a PyByteArray object. Also, variable length arrays are added in C99, so you will need to manually allocate the raw_* arrays in the heap. This seems like a cool feature!

On Thu, Jan 7, 2016 at 5:26 PM, Blake Griffith <blake.a.griffith at gmail.com> wrote:

Hi!

I'm interested in adding the functionality to do something like: >>> b'a' ^ b'b' b'\x03'

Instead of the good ol' TypeError. I think both bytes and bytearray should support all the bitwise operations. I've never hacked on cpython before. I'm starting by just trying to add xor to bytearray. I have a ByteArrayXor function that I think should do this here https://github.com/cowlicks/cpython/commit/d6dddb11cdb33032b39dcb9dfdaa7b10d4377b5f But I'm not sure how to hook this in to the rest of cypython. I tried adding it where bytearrayassequence is declared in this bytearrayobject.c file. But that gave me compiler warnings and broke things. So now that I have this ByteArrayXor function, how do I make it be bytearray.xor? Thanks! Blake

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