/usr/share/pyshared/pkpgpdls/dvi.py is in pkpgcounter 3.50-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | # -*- coding: ISO-8859-15 -*-
#
# pkpgcounter : a generic Page Description Language parser
#
# (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com>
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
# $Id: dvi.py 374 2007-12-09 14:26:15Z jerome $
#
"""This modules implements a page counter for DVI documents."""
import sys
import os
import mmap
from struct import unpack
import pdlparser
class Parser(pdlparser.PDLParser) :
"""A parser for DVI documents."""
totiffcommands = [ 'dvips -q -o - "%(infname)s" | gs -sDEVICE=tiff24nc -dPARANOIDSAFER -dNOPAUSE -dBATCH -dQUIET -r"%(dpi)i" -sOutputFile="%(outfname)s" -' ]
required = [ "dvips", "gs" ]
format = "DVI"
def isValid(self) :
"""Returns True if data is DVI, else False."""
try :
if (ord(self.firstblock[0]) == 0xf7) \
and (ord(self.lastblock[-1]) == 0xdf) :
return True
else :
return False
except IndexError :
return False
def getJobSize(self) :
"""Counts pages in a DVI document.
Algorithm by Jerome Alet.
The documentation used for this was :
http://www.math.umd.edu/~asnowden/comp-cont/dvi.html
"""
infileno = self.infile.fileno()
minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED)
pagecount = 0
pos = -1
eofchar = chr(0xdf)
postchar = chr(0xf8)
try :
try :
while minfile[pos] == eofchar :
pos -= 1
idbyte = minfile[pos]
if idbyte != minfile[1] :
raise IndexError, "Invalid DVI file."
pos = unpack(">I", minfile[pos - 4:pos])[0]
if minfile[pos] != postchar :
raise IndexError, "Invalid DVI file."
pagecount = unpack(">H", minfile[pos + 27: pos + 29])[0]
except IndexError : # EOF ?
pass
finally :
minfile.close() # reached EOF
return pagecount
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