Added \x00 symbol to pdf whitespaces. Slightly refactored utils module.

[caxap]

PyPDF2 unable to parse files with '\x00' character. Actually it is not a whitespace symbol, but I believe that we can just skip it. I've tested this fix for several documents and all looks ok.

Also note as '\x00' is not a whitespace, so '\x00'.isspace() will be False.

[mstamy2]

Looks like a good fix for this issue - utils.py should define a list of whitespace characters anyway.

The only problem I am having is with map(). With the line
WHITESPACES = map(b_, [' ', '\n', '\r', '\t', '\x00'])
I am getting various read errors, which mean that for some reason the whitespace methods aren't working properly. (In Python 3)

If I instead write
WHITESPACES = [b_(' '), b_('\n'), b_('\r'), b_('\t'), b_('\x00')]
then everything works as intended.

I believe this is caused by differences between map() in Python 2 and Python 3.

[caxap]

Oh, yes. Sorry for that, I'm "Python 2" guy :). So I can update fix.

[mstamy2]

Thanks!
Sorry, it can be a hassle to maintain compatibility with Python 2 and 3 simultaneously.

[caxap]

Updated!

[mstamy2]

Thanks!