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8 changes: 8 additions & 0 deletions warc/arc.py
Original file line number Diff line number Diff line change
Expand Up @@ -251,6 +251,14 @@ def __init__(self, filename=None, mode=None, fileobj=None, version = None, file_
"""
if fileobj is None:
fileobj = __builtin__.open(filename, mode or "rb")
mode = fileobj.mode
# initialize compress based on filename, if not already specified
if compress is None and filename and filename.endswith(".gz"):
compress = True

if compress:
fileobj = gzip2.GzipFile(fileobj=fileobj, mode=mode)

self.fileobj = fileobj

if version != None and int(version) not in (1, 2):
Expand Down