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# 2ping - A bi-directional ping utility
# Copyright (C) 2010-2020 Ryan Finnie
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
import binascii
import copy
import sys
digest_size = 4
class CRC32:
digest_size = 4
block_size = 64
_crc = 0
def __init__(self, buf=None):
if buf is not None:
self.update(buf)
def copy(self):
return copy.copy(self)
def update(self, buf):
self._crc = binascii.crc32(buf, self._crc)
def clear(self):
self._crc = 0
def digest(self):
i = self._crc & 0xFFFFFFFF
out = bytearray()
while i >= 256:
out.insert(0, i & 0xFF)
i = i >> 8
out.insert(0, i)
out_len = len(out)
if out_len < 4:
out = bytearray(4 - out_len) + out
return out
def hexdigest(self):
return self.digest().hex()
def new(buf=None):
return CRC32(buf)
def main(argv):
if argv is None:
argv = sys.argv
files = argv[1:]
if len(files) == 0:
files = ["-"]
for file in files:
c = new()
if file == "-":
for buf in sys.stdin.buffer.readlines():
c.update(buf)
else:
with open(file, "rb") as f:
for buf in f.readlines():
c.update(buf)
print("{}\t{}".format(c.hexdigest(), file))
def module_init():
if __name__ == "__main__":
sys.exit(main(sys.argv))
module_init()
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