/usr/share/pyshared/pkpgpdls/escpages03.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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | # -*- 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: escpages03.py 374 2007-12-09 14:26:15Z jerome $
#
"""This modules implements a page counter for TIFF documents."""
import sys
import os
import mmap
from struct import unpack
import pdlparser
import pjl
class Parser(pdlparser.PDLParser) :
"""A parser for ESC/PageS03 documents."""
format = "ESC/PageS03"
def isValid(self) :
"""Returns True if data is TIFF, else False."""
if self.firstblock.startswith("\033\1@EJL") and \
(self.firstblock.find("=ESC/PAGES03\n") != -1) :
return True
else :
return False
def getJobSize(self) :
"""Counts pages in an ESC/PageS03 document.
Algorithm by Jerome Alet.
Reverse engineered the file format.
"""
infileno = self.infile.fileno()
minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED)
pagecount = 0
marker = "=ESC/PAGES03\n"
startpos = minfile.find(marker)
startsequence = chr(0x1d)
if startpos == -1 :
raise pdlparser.PDLParserError, "Invalid ESC/PageS03 file."
startpos += len(marker)
if minfile[startpos] != startsequence :
raise pdlparser.PDLParserError, "Invalid ESC/PageS03 file."
endsequence = "eps{I"
lgendsequence = len(endsequence)
try :
try :
while True :
if minfile[startpos] == startsequence :
skiplen = 0
while True :
startpos += 1
c = minfile[startpos]
if not c.isdigit() :
break
else :
skiplen = (skiplen * 10) + int(c)
if minfile[startpos:startpos+lgendsequence] == endsequence :
startpos += (skiplen + lgendsequence)
else :
if minfile[startpos:startpos+6] == "\033\1@EJL" :
# Probably near the end of the file.
# Test suite was too small to be sure.
ejlparser = pjl.EJLParser(minfile[startpos:])
pagecount = ejlparser.environment_variables.get("PAGES", "1")
if pagecount.startswith('"') and pagecount.endswith('"') :
pagecount = pagecount[1:-1]
pagecount = int(pagecount)
if pagecount <= 0 :
pagecount = 1 # TODO : 0 or 1000000 ??? ;-)
break
startpos += 1
except IndexError :
pass
finally :
minfile.close()
return pagecount
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