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On windows, check if the file is opened in binary mode #369

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On windows, check if the file is opened in binary mode #369

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162ad76
On windows, check if the file is opened in binary mode
Jun 1, 2017
fad3d74
Fix typo for pcap.Writer
Jun 1, 2017
bdc5027
Expand checks to all OS
kbandla Mar 22, 2022
5402e2f
Merge branch 'master' into pcap_binary_mode
brifordwylie Mar 29, 2022
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4 changes: 4 additions & 0 deletions dpkt/pcap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,8 @@ class Writer(object):
__le = sys.byteorder == 'little'

def __init__(self, fileobj, snaplen=1500, linktype=DLT_EN10MB, nano=False):
if 'b' not in fileobj.mode:
raise ValueError('PCAP file NOT in binary mode (wb)')
self.__f = fileobj
self._precision = 9 if nano else 6
self._precision_multiplier = 10**self._precision
Expand Down Expand Up @@ -274,6 +276,8 @@ class Reader(object):
"""
def __init__(self, fileobj):
self.name = getattr(fileobj, 'name', '<%s>' % fileobj.__class__.__name__)
if 'b' not in fileobj.mode:
raise ValueError('PCAP file (%s) not opened in binary mode (rb)' % self.name)
self.__f = fileobj
buf = self.__f.read(FileHdr.__hdr_len__)
self.__fh = FileHdr(buf)
Expand Down