support zstd

pydpkg/__init__.py

@@ -15,6 +15,7 @@ import tarfile
 from collections import defaultdict
 from gzip import GzipFile
 import lzma
+import pyzstd
 from email import message_from_string, message_from_file
 from functools import cmp_to_key
 
@@ -28,7 +29,8 @@ REQUIRED_HEADERS = ('package', 'version', 'architecture')
 
 control_openers = {
     'gz': lambda fob: GzipFile(fileobj=fob),
-    'xz': lambda fob: lzma.open(fob, "r")
+    'xz': lambda fob: lzma.open(fob, "r"),
+    'zst': lambda fob: pyzstd.open(fob, "r")
 }
 
 

setup.py

@@ -17,7 +17,8 @@ setup(
     setup_requires=[
         'arpy==1.1.1',
         'six>=1.10.0',
-        'PGPy==0.4.1'
+        'PGPy==0.6.0',
+        'pyzstd>=0.15.7'
     ],
     extras_require={
         'test': ['pep8==1.7.0', 'pytest==3.1.1', 'pylint==1.7.1']