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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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5 changes: 5 additions & 0 deletions dpkt/pcap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,8 @@ class Writer(object):
"""

def __init__(self, fileobj, snaplen=1500, linktype=DLT_EN10MB, nano=False):
if fileobj.mode != 'wb':

@obormot obormot Jun 1, 2017

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add a check for Windows, same as below?

@kbandla kbandla Jun 1, 2017

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Oops! yes, thanks for catching

raise ValueError('PCAP file not in binary mode (rb)')
self.__f = fileobj
self._precision = 9 if nano else 6
magic = TCPDUMP_MAGIC_NANO if nano else TCPDUMP_MAGIC
Expand Down Expand Up @@ -240,6 +242,9 @@ class Reader(object):

def __init__(self, fileobj):
self.name = getattr(fileobj, 'name', '<%s>' % fileobj.__class__.__name__)
if sys.platform.startswith('win'):

@brifordwylie brifordwylie Jun 1, 2017

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So do we want to just check 'rb' mode for all platforms?

if fileobj.mode != 'rb':

@obormot obormot Jun 1, 2017

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both mode checks feel a bit too restrictive (but make complete sense at the same time..). I personally would go with smth like if 'b' not in fileobj.mode

@kbandla kbandla Jun 1, 2017

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Just noticed that i did not account for append modes, your suggestion takes care of that too.

raise ValueError('PCAP file (%s) not opened in binary mode (rb)'%self.name)

@obormot obormot Jun 1, 2017

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pep8

... (rb)' % self.name)
         ^ ^ spaces

self.__f = fileobj
buf = self.__f.read(FileHdr.__hdr_len__)
self.__fh = FileHdr(buf)
Expand Down