[564] | 1 | # -*- coding: UTF-8 -*- |
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[191] | 2 | # |
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| 3 | # pkpgcounter : a generic Page Description Language parser |
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| 4 | # |
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[564] | 5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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[463] | 6 | # This program is free software: you can redistribute it and/or modify |
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[191] | 7 | # it under the terms of the GNU General Public License as published by |
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[463] | 8 | # the Free Software Foundation, either version 3 of the License, or |
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[191] | 9 | # (at your option) any later version. |
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[463] | 10 | # |
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[191] | 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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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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[463] | 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[191] | 18 | # |
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| 19 | # $Id$ |
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| 20 | # |
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[193] | 21 | |
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[355] | 22 | """This modules implements a page counter for PDF documents.""" |
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| 23 | |
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[193] | 24 | import re |
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| 25 | |
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[235] | 26 | import pdlparser |
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[193] | 27 | |
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[240] | 28 | class PDFObject : |
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| 29 | """A class for PDF objects.""" |
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| 30 | def __init__(self, major, minor, description) : |
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| 31 | """Initialize the PDF object.""" |
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| 32 | self.major = major |
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| 33 | self.minor = minor |
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[491] | 34 | self.majori = int(major) |
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| 35 | self.minori = int(minor) |
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[240] | 36 | self.description = description |
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| 37 | self.comments = [] |
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| 38 | self.content = [] |
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| 39 | self.parent = None |
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| 40 | self.kids = [] |
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| 41 | |
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[220] | 42 | class Parser(pdlparser.PDLParser) : |
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[193] | 43 | """A parser for PDF documents.""" |
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[492] | 44 | totiffcommands = [ 'gs -sDEVICE=tiff24nc -dPARANOIDSAFER -dNOPAUSE -dBATCH -dQUIET -r"%(dpi)i" -sOutputFile="%(outfname)s" "%(infname)s"' ] |
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[527] | 45 | required = [ "gs" ] |
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[491] | 46 | openmode = "rU" |
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[555] | 47 | format = "PDF" |
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[220] | 48 | def isValid(self) : |
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[387] | 49 | """Returns True if data is PDF, else False.""" |
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[522] | 50 | if self.firstblock.startswith("%PDF-") or \ |
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| 51 | self.firstblock.startswith("\033%-12345X%PDF-") or \ |
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| 52 | ((self.firstblock[:128].find("\033%-12345X") != -1) and (self.firstblock.upper().find("LANGUAGE=PDF") != -1)) or \ |
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| 53 | (self.firstblock.find("%PDF-") != -1) : |
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[387] | 54 | return True |
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[220] | 55 | else : |
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[387] | 56 | return False |
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[220] | 57 | |
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[193] | 58 | def getJobSize(self) : |
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| 59 | """Counts pages in a PDF document.""" |
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[240] | 60 | # First we start with a generic PDF parser. |
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| 61 | lastcomment = None |
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| 62 | objects = {} |
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[241] | 63 | inobject = 0 |
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[243] | 64 | objre = re.compile(r"\s?(\d+)\s+(\d+)\s+obj[<\s/]?") |
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[450] | 65 | for line in self.infile : |
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[491] | 66 | line = line.strip() |
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[450] | 67 | if line.startswith("% ") : |
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| 68 | if inobject : |
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| 69 | obj.comments.append(line) |
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| 70 | else : |
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| 71 | lastcomment = line[2:] |
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| 72 | else : |
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| 73 | # New object begins here |
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| 74 | result = objre.search(line) |
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| 75 | if result is not None : |
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[491] | 76 | (major, minor) = line[result.start():result.end()].split()[:2] |
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[450] | 77 | obj = PDFObject(major, minor, lastcomment) |
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| 78 | obj.content.append(line[result.end():]) |
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| 79 | inobject = 1 |
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| 80 | elif line.startswith("endobj") \ |
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| 81 | or line.startswith(">> endobj") \ |
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| 82 | or line.startswith(">>endobj") : |
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| 83 | # Handle previous object, if any |
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[241] | 84 | if inobject : |
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[450] | 85 | # only overwrite older versions of this object |
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| 86 | # same minor seems to be possible, so the latest one |
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| 87 | # found in the file will be the one we keep. |
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| 88 | # if we want the first one, just use > instead of >= |
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| 89 | oldobject = objects.setdefault(major, obj) |
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[491] | 90 | if int(minor) >= oldobject.minori : |
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[450] | 91 | objects[major] = obj |
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[491] | 92 | # self.logdebug("Object(%i, %i) overwritten with Object(%i, %i)" % (oldobject.majori, oldobject.minori, obj.majori, obj.minori)) |
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| 93 | # self.logdebug("Object(%i, %i)" % (obj.majori, obj.minori)) |
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[450] | 94 | inobject = 0 |
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| 95 | else : |
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| 96 | if inobject : |
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| 97 | obj.content.append(line) |
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[240] | 98 | |
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| 99 | # Now we check each PDF object we've just created. |
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[450] | 100 | newpageregexp = re.compile(r"(/Type)\s?(/Page)[/>\s]", re.I) |
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[193] | 101 | pagecount = 0 |
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[252] | 102 | for obj in objects.values() : |
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| 103 | content = "".join(obj.content) |
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[243] | 104 | count = len(newpageregexp.findall(content)) |
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[450] | 105 | if count and (content != r"<</Type /Page>>") : # Empty pages which are not rendered ? |
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| 106 | pagecount += count |
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[193] | 107 | return pagecount |
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