CODEWITHSUNDEEP
pythonpython-2.7zlib
jpou
jpou

Reputation: 1995

decompress zip string in Python 2.7

I am trying to decompress a byte64 encoded string in Python 2.7.

I can verify that my string is valid by running this in the command line:

echo -n "MY_BASE64_ENCODED_STRING" | base64 -d | zcat

However, if I run this in Python2.7:

b64_data = 'MY_BASE64_ENCODED_STRING'
text_data = zlib.decompress(base64.b64decode(b64_data))

I get an exception:

Error -3 while decompressing data: incorrect header check

Should I pass extra parameters to zlib.decompress to make it work?

Upvotes: 5

Views: 4647

Answers (1)

kitti
kitti

Reputation: 14794

As noted in the comments, your data is in gzip format and not just zlib compressed data. In Python 2.7, you can use GzipFile with StringIO to process the string:

>>> from gzip import GzipFile
>>> from StringIO import StringIO
>>> from base64 import b64decode
>>> data = 'H4sIAEm2algAAytJLS7hAgDGNbk7BQAAAA=='
>>> GzipFile(fileobj=StringIO(b64decode(data))).read()
'test\n'

Upvotes: 5

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