root / pkpgcounter / trunk / pkpgpdls / escp2.py @ 508

Revision 491, 2.6 kB (checked in by jerome, 17 years ago)

Major code cleaning. Now clearer, although probably a bit slower since
a file can be opened several times.
Now universal line opening mode is only used when needed (PS, PDF and plain
text), and binary opening mode is used for the other formats.
This mean we will be able to remove mmap calls wherever possible, finally.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Auth Date Id Rev
Line 
1#! /usr/bin/env python
2# -*- coding: ISO-8859-15 -*-
3#
4# pkpgcounter : a generic Page Description Language parser
5#
6# (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com>
7# This program is free software: you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation, either version 3 of the License, or
10# (at your option) any later version.
11#
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
18# along with this program.  If not, see <http://www.gnu.org/licenses/>.
19#
20# $Id$
21#
22
23"""This modules implements a page counter for ESC/P2 documents."""
24
25import sys
26
27import pdlparser
28
29class Parser(pdlparser.PDLParser) :
30    """A parser for ESC/P2 documents."""
31    def isValid(self) :       
32        """Returns True if data is ESC/P2, else False."""
33        if self.firstblock.startswith("\033@") or \
34           self.firstblock.startswith("\033*") or \
35           self.firstblock.startswith("\n\033@") or \
36           self.firstblock.startswith("\0\0\0\033\1@EJL") : # ESC/P Raster ??? Seen on Stylus Photo 1284
37            self.logdebug("DEBUG: Input file is in the ESC/P2 format.")
38            return True
39        else :   
40            return False
41           
42    def getJobSize(self) :   
43        """Counts pages in an ESC/P2 document."""
44        # with Gimpprint, at least, for each page there
45        # are two Reset Printer sequences (ESC + @)
46        marker1 = "\033@"
47       
48        # with other software or printer driver, we
49        # may prefer to search for "\r\n\fESCAPE"
50        # or "\r\fESCAPE"
51        marker2r = "\r\f\033"
52        marker2rn = "\r\n\f\033"
53       
54        # and ghostscript's stcolor for example seems to
55        # output ESC + @ + \f for each page plus one
56        marker3 = "\033@\f"
57       
58        # while ghostscript's escp driver outputs instead
59        # \f + ESC + @
60        marker4 = "\f\033@"
61       
62        data = self.infile.read()
63        pagecount1 = data.count(marker1)
64        pagecount2 = max(data.count(marker2r), data.count(marker2rn))
65        pagecount3 = data.count(marker3)
66        pagecount4 = data.count(marker4)
67           
68        if pagecount2 :   
69            return pagecount2
70        elif pagecount3 > 1 :     
71            return pagecount3 - 1
72        elif pagecount4 :   
73            return pagecount4
74        else :   
75            return int(pagecount1 / 2)       
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