Compress base64 string in python and extract it in PHP

Question

I'm sending a base64 string compressed with zlib in Python, converted to base64, sent to a PHP page where it will be extracted.

I'm having trouble with this. How would I do this?

Right now I have:

python

compressor = zlib.compressobj(wbits=(16+zlib.MAX_WBITS))
compressed = compressor.compress(str)
compressed += compressor.flush()

php

*POST deccoded here, b64data is the output*
$b64data = zlib_decode($data);

I left out the part where I decode from base64. The php code throws and error about invalid data at the zlib function. zlib_decode(): data error

um. ... base64_decode($b64data) maybe... base64_decode , just guessing. — ArtisticPhoenix
– ArtisticPhoenix, Commented Mar 3, 2019 at 1:34
Yeah I left that part out. I'm not having trouble decoding. It throws an error about invalid compression at the zlib function. — Thunder-Chaser
– Thunder-Chaser, Commented Mar 3, 2019 at 1:35
Your code doesn't contain the base64 de-/coding. Maybe try this first with an uncompressed string to drill down the cause of problem. — Michael Butscher
– Michael Butscher, Commented Mar 3, 2019 at 1:35
It throws an error about invalid compression at the zlib function that would have been nice to know, you may want to add that to the question. — ArtisticPhoenix
– ArtisticPhoenix, Commented Mar 3, 2019 at 1:36
Using wbits=(16+zlib.MAX_WBITS) creates a gzip-header instead of the zlib header for wbits=zlib.MAX_WBITS. I don't know if PHP can cope with that. — Michael Butscher
– Michael Butscher, Commented Mar 3, 2019 at 1:41

Thunder-Chaser · Accepted Answer · 2019-03-03 05:12:16Z

1

Ok, I messed up and the problem wasn't with the zlib function.

Long story short I used to encode the data twice on the Python side but changed it to only encode once and never removed the extra base64_decode from the PHP.

Thanks for the help guys.

answered Mar 3, 2019 at 5:12

Thunder-Chaser

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