[216] | 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | # |
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| 4 | # pkpgcounter : a generic Page Description Language parser |
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| 5 | # |
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[443] | 6 | # (c) 2003, 2004, 2005, 2006, 2007 Jerome Alet <alet@librelogiciel.com> |
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[463] | 7 | # This program is free software: you can redistribute it and/or modify |
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[216] | 8 | # it under the terms of the GNU General Public License as published by |
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[463] | 9 | # the Free Software Foundation, either version 3 of the License, or |
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[216] | 10 | # (at your option) any later version. |
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[463] | 11 | # |
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[216] | 12 | # This program is distributed in the hope that it will be useful, |
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | # GNU General Public License for more details. |
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| 16 | # |
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| 17 | # You should have received a copy of the GNU General Public License |
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[463] | 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[216] | 19 | # |
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| 20 | # $Id$ |
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| 21 | # |
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| 22 | |
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[539] | 23 | """This modules implements a page counter for Structured Fax documents.""" |
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[356] | 24 | |
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[539] | 25 | import struct |
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[216] | 26 | |
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[235] | 27 | import pdlparser |
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[216] | 28 | |
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[220] | 29 | class Parser(pdlparser.PDLParser) : |
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[539] | 30 | """A parser for Structured Fax documents.""" |
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[220] | 31 | def isValid(self) : |
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[539] | 32 | """Returns True if data is Structured Fax, else False.""" |
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| 33 | if self.firstblock.startswith("Sfff") : |
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| 34 | self.logdebug("DEBUG: Input file is in the Structured Fax format.") |
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| 35 | return True |
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| 36 | else : |
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[387] | 37 | return False |
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[220] | 38 | |
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[216] | 39 | def getJobSize(self) : |
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[539] | 40 | """Counts pages in a Structured Fax document. |
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[216] | 41 | |
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| 42 | Algorithm by Jerome Alet. |
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| 43 | |
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| 44 | The documentation used for this was : |
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| 45 | |
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[539] | 46 | http://delphi.pjh2.de/articles/graphic/sff_format.php |
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[216] | 47 | """ |
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[539] | 48 | unpack = struct.unpack |
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[216] | 49 | pagecount = 0 |
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[539] | 50 | docheader = self.infile.read(20) |
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[216] | 51 | try : |
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[539] | 52 | (sffid, |
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| 53 | version, |
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| 54 | reserved, |
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| 55 | userinfo, |
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| 56 | docpagecount, |
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| 57 | offsetfirstpage, |
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| 58 | offsetlastpage, |
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| 59 | offsetdocumentend) = unpack("<4sBBHHHII", docheader) |
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| 60 | self.infile.seek(offsetfirstpage - len(docheader), 1) |
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| 61 | while True : |
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| 62 | headerid = self.infile.read(1) |
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| 63 | if not headerid : |
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| 64 | break |
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| 65 | headerid = ord(headerid) |
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| 66 | if 1 <= headerid <= 216 : # Normal record header |
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| 67 | self.infile.seek(headerid, 1) |
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| 68 | elif headerid == 255 : # Illegal line / Additional user info |
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| 69 | additionalbyte = self.infile.read(1) |
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| 70 | if not additionalbyte : |
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| 71 | break |
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| 72 | additionalbyte = ord(additionalbyte) |
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| 73 | if 1 <= additionalbyte <= 255 : |
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| 74 | # Skip additional user information (reserved) |
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| 75 | self.infile.seek(additionalbyte, 1) |
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| 76 | elif not headerid : |
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| 77 | # Record with more than 216 MH-coded bytes |
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| 78 | recordlen = self.infile.read(2) |
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| 79 | if not recordlen : |
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| 80 | break |
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| 81 | recordlen = unpack("<H", recordlen)[0] |
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| 82 | self.infile.seek(recordlen, 1) |
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| 83 | elif headerid == 254 : # Page header |
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| 84 | pageheader = self.infile.read(17) |
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| 85 | if not pageheader : |
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| 86 | break |
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| 87 | headerlen = ord(pageheader[0]) |
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| 88 | if not headerlen : |
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| 89 | break # End Of Document |
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| 90 | (vres, |
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| 91 | hres, |
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| 92 | coding, |
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| 93 | reserved, |
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| 94 | linelen, |
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| 95 | pagelen, |
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| 96 | offsetpreviouspage, |
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| 97 | offsetnextpage) = unpack("<4BHHII", pageheader[1:]) |
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| 98 | pagecount += 1 |
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| 99 | if (offsetnextpage == 1) or (vres == 255) : |
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| 100 | break # End Of Document |
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| 101 | self.infile.seek(offsetnextpage, 1) |
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| 102 | except struct.error : |
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| 103 | raise pdlparser.PDLParserError, "Invalid Structured Fax datas" |
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| 104 | return max(docpagecount, pagecount) |
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