[216] | 1 | #! /usr/bin/env python |
---|
| 2 | # -*- coding: ISO-8859-15 -*- |
---|
| 3 | # |
---|
| 4 | # pkpgcounter : a generic Page Description Language parser |
---|
| 5 | # |
---|
[443] | 6 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
---|
[463] | 7 | # This program is free software: you can redistribute it and/or modify |
---|
[216] | 8 | # it under the terms of the GNU General Public License as published by |
---|
[463] | 9 | # the Free Software Foundation, either version 3 of the License, or |
---|
[216] | 10 | # (at your option) any later version. |
---|
[463] | 11 | # |
---|
[216] | 12 | # This program is distributed in the hope that it will be useful, |
---|
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 15 | # GNU General Public License for more details. |
---|
| 16 | # |
---|
| 17 | # You should have received a copy of the GNU General Public License |
---|
[463] | 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
---|
[216] | 19 | # |
---|
| 20 | # $Id$ |
---|
| 21 | # |
---|
| 22 | |
---|
[545] | 23 | """This modules implements a page counter for Canon BJ documents.""" |
---|
[356] | 24 | |
---|
[216] | 25 | import os |
---|
| 26 | import mmap |
---|
| 27 | |
---|
[235] | 28 | import pdlparser |
---|
[216] | 29 | |
---|
[220] | 30 | class Parser(pdlparser.PDLParser) : |
---|
[545] | 31 | """A parser for Canon BJ documents.""" |
---|
[555] | 32 | format = "Canon BJ/BJC" |
---|
[220] | 33 | def isValid(self) : |
---|
[552] | 34 | """Returns True if data is BJ/BJC, else False.""" |
---|
[545] | 35 | if self.firstblock.startswith("\033[K\002\000") : |
---|
| 36 | return True |
---|
| 37 | else : |
---|
[387] | 38 | return False |
---|
[220] | 39 | |
---|
[216] | 40 | def getJobSize(self) : |
---|
[545] | 41 | """Counts pages in a Canon BJ document. |
---|
[216] | 42 | |
---|
| 43 | Algorithm by Jerome Alet. |
---|
| 44 | |
---|
| 45 | The documentation used for this was : |
---|
| 46 | |
---|
[545] | 47 | ghostscript-8.60/src/gdevbj*.c |
---|
[216] | 48 | """ |
---|
| 49 | infileno = self.infile.fileno() |
---|
| 50 | minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED) |
---|
| 51 | pagecount = 0 |
---|
[545] | 52 | pos = 0 |
---|
[216] | 53 | try : |
---|
[489] | 54 | try : |
---|
[545] | 55 | while True : |
---|
| 56 | if minfile[pos] == "\033" : |
---|
| 57 | # Look if we've found an initialization sequence |
---|
| 58 | # through the Set Initial Condition command |
---|
| 59 | pageheader = minfile[pos:pos+7] |
---|
| 60 | if pageheader in ("\033[K\002\000\000\017", |
---|
| 61 | "\033[K\002\000\000\044", |
---|
| 62 | "\033[K\002\000\004\044") : |
---|
| 63 | pagecount += 1 |
---|
| 64 | pos += 6 |
---|
| 65 | pos += 1 |
---|
[489] | 66 | except IndexError : # EOF ? |
---|
| 67 | pass |
---|
| 68 | finally : |
---|
| 69 | minfile.close() # reached EOF |
---|
[216] | 70 | return pagecount |
---|