[3410] | 1 | # -*- coding: utf-8 -*- |
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[473] | 2 | # |
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| 3 | # pkpgcounter : a generic Page Description Language parser |
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| 4 | # |
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[3474] | 5 | # (c) 2003-2009 Jerome Alet <alet@librelogiciel.com> |
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[473] | 6 | # This program is free software: you can redistribute it and/or modify |
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| 7 | # it under the terms of the GNU General Public License as published by |
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| 8 | # the Free Software Foundation, either version 3 of the License, or |
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| 9 | # (at your option) any later version. |
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[3436] | 10 | # |
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[473] | 11 | # This program is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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[3436] | 15 | # |
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[473] | 16 | # You should have received a copy of the GNU General Public License |
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| 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 18 | # |
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| 19 | # $Id$ |
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| 20 | # |
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| 21 | |
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| 22 | """This modules implements a page counter for TIFF documents.""" |
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| 23 | |
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| 24 | import sys |
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| 25 | import os |
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| 26 | import mmap |
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| 27 | from struct import unpack |
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| 28 | |
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| 29 | import pdlparser |
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| 30 | import pjl |
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| 31 | |
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| 32 | class Parser(pdlparser.PDLParser) : |
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[475] | 33 | """A parser for ESC/PageS03 documents.""" |
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[555] | 34 | format = "ESC/PageS03" |
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[3436] | 35 | def isValid(self) : |
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[473] | 36 | """Returns True if data is TIFF, else False.""" |
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[522] | 37 | if self.firstblock.startswith("\033\1@EJL") and \ |
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| 38 | (self.firstblock.find("=ESC/PAGES03\n") != -1) : |
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[473] | 39 | return True |
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[3436] | 40 | else : |
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[473] | 41 | return False |
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[3436] | 42 | |
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[473] | 43 | def getJobSize(self) : |
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[475] | 44 | """Counts pages in an ESC/PageS03 document. |
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[3436] | 45 | |
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[473] | 46 | Algorithm by Jerome Alet. |
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| 47 | Reverse engineered the file format. |
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| 48 | """ |
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| 49 | infileno = self.infile.fileno() |
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| 50 | minfile = mmap.mmap(infileno, os.fstat(infileno)[6], prot=mmap.PROT_READ, flags=mmap.MAP_SHARED) |
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| 51 | pagecount = 0 |
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| 52 | marker = "=ESC/PAGES03\n" |
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| 53 | startpos = minfile.find(marker) |
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| 54 | startsequence = chr(0x1d) |
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| 55 | if startpos == -1 : |
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[475] | 56 | raise pdlparser.PDLParserError, "Invalid ESC/PageS03 file." |
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[473] | 57 | startpos += len(marker) |
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| 58 | if minfile[startpos] != startsequence : |
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[475] | 59 | raise pdlparser.PDLParserError, "Invalid ESC/PageS03 file." |
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[473] | 60 | endsequence = "eps{I" |
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| 61 | lgendsequence = len(endsequence) |
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| 62 | try : |
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[3436] | 63 | try : |
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[473] | 64 | while True : |
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| 65 | if minfile[startpos] == startsequence : |
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| 66 | skiplen = 0 |
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| 67 | while True : |
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| 68 | startpos += 1 |
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| 69 | c = minfile[startpos] |
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| 70 | if not c.isdigit() : |
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| 71 | break |
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| 72 | else : |
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| 73 | skiplen = (skiplen * 10) + int(c) |
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| 74 | if minfile[startpos:startpos+lgendsequence] == endsequence : |
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[475] | 75 | startpos += (skiplen + lgendsequence) |
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[473] | 76 | else : |
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| 77 | if minfile[startpos:startpos+6] == "\033\1@EJL" : |
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[475] | 78 | # Probably near the end of the file. |
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| 79 | # Test suite was too small to be sure. |
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[473] | 80 | ejlparser = pjl.EJLParser(minfile[startpos:]) |
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| 81 | pagecount = ejlparser.environment_variables.get("PAGES", "1") |
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| 82 | if pagecount.startswith('"') and pagecount.endswith('"') : |
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| 83 | pagecount = pagecount[1:-1] |
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[3436] | 84 | pagecount = int(pagecount) |
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[473] | 85 | if pagecount <= 0 : |
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[475] | 86 | pagecount = 1 # TODO : 0 or 1000000 ??? ;-) |
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[473] | 87 | break |
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[3436] | 88 | startpos += 1 |
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| 89 | except IndexError : |
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[473] | 90 | pass |
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[3436] | 91 | finally : |
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[473] | 92 | minfile.close() |
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| 93 | return pagecount |
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