Max Erickson wrote:
MRAB <pyt...@mrabarnett.plus.com> wrote:
Brandon Fredericks wrote:
I did a search within this group, but couldn't find any
information on this.
I am sending base64 encoded data as the content over http using
urllib2 urlopen. When I receive the data and attempt to decode
it, I get an "Incorrect Padding" error. Is there a simple way to
fix this? A better way to send and receive the data possibly
(using base64 of course)?
Base-64 encodes 3 bytes (echo in the range 0-255) to 4 bytes
(each in a more restricted range). The length of the output is
_always_ a multiple of 4 (ignoring whitespace); the method adds
extra padding bytes (ASCII '=') to ensure that this is the case
if the length of the input isn't a multiple of 3.
So, if decoding raises an "Incorrect Padding" error then strip
out any whitespace and append extra ASCII '=' to make its length
a multiple of 3, then try decoding again. (Or you could just
repeatedly add one pad character and retry, up to 3 times.)
The length of the encoded string should be a multiple of 4 (as you
state in the second sentence of your post), not a multiple of 3.
Oops, correct! :-)
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