1 | # -*- coding: UTF-8 -*- |
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2 | # |
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3 | # pkpgcounter : a generic Page Description Language parser |
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4 | # |
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5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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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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10 | # |
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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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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 PDF documents. |
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23 | |
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24 | Some informations taken from PDF Reference v1.7 by Adobe. |
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25 | """ |
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26 | |
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27 | import re |
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28 | |
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29 | import pdlparser |
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30 | |
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31 | PDFWHITESPACE = chr(0) \ |
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32 | + chr(9) \ |
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33 | + chr(10) \ |
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34 | + chr(12) \ |
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35 | + chr(13) \ |
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36 | + chr(32) |
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37 | |
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38 | PDFDELIMITERS = r"()<>[]{}/%" |
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39 | PDFCOMMENT = r"%" # Up to next EOL |
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40 | |
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41 | PDFPAGEMARKER = "<< /Type /Page " # Where spaces are any whitespace char |
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42 | |
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43 | PDFMEDIASIZE = "/MediaBox [xmin ymin xmax ymax]" # an example. MUST be present in Page objects |
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44 | PDFOBJREGEX = r"\s+(\d+)\s+(\d+)\s+(obj\s*.+\s*endobj)" # Doesn't work as expected |
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45 | |
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46 | class PDFObject : |
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47 | """A class for PDF objects.""" |
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48 | def __init__(self, major, minor, description) : |
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49 | """Initialize the PDF object.""" |
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50 | self.major = major |
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51 | self.minor = minor |
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52 | self.majori = int(major) |
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53 | self.minori = int(minor) |
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54 | self.description = description |
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55 | self.comments = [] |
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56 | self.content = [] |
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57 | self.parent = None |
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58 | self.kids = [] |
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59 | |
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60 | class Parser(pdlparser.PDLParser) : |
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61 | """A parser for PDF documents.""" |
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62 | totiffcommands = [ 'gs -sDEVICE=tiff24nc -dPARANOIDSAFER -dNOPAUSE -dBATCH -dQUIET -r"%(dpi)i" -sOutputFile="%(outfname)s" "%(infname)s"' ] |
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63 | required = [ "gs" ] |
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64 | openmode = "rU" |
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65 | format = "PDF" |
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66 | def isValid(self) : |
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67 | """Returns True if data is PDF, else False.""" |
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68 | if self.firstblock.startswith("%PDF-") or \ |
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69 | self.firstblock.startswith("\033%-12345X%PDF-") or \ |
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70 | ((self.firstblock[:128].find("\033%-12345X") != -1) and (self.firstblock.upper().find("LANGUAGE=PDF") != -1)) or \ |
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71 | (self.firstblock.find("%PDF-") != -1) : |
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72 | return True |
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73 | else : |
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74 | return False |
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75 | |
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76 | def getJobSize(self) : |
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77 | """Counts pages in a PDF document.""" |
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78 | # First we start with a generic PDF parser. |
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79 | lastcomment = None |
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80 | objects = {} |
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81 | inobject = 0 |
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82 | objre = re.compile(r"\s?(\d+)\s+(\d+)\s+obj[<\s/]?") |
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83 | for line in self.infile : |
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84 | line = line.strip() |
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85 | if line.startswith("% ") : |
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86 | if inobject : |
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87 | obj.comments.append(line) |
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88 | else : |
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89 | lastcomment = line[2:] |
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90 | else : |
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91 | # New object begins here |
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92 | result = objre.search(line) |
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93 | if result is not None : |
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94 | (major, minor) = line[result.start():result.end()].split()[:2] |
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95 | obj = PDFObject(major, minor, lastcomment) |
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96 | obj.content.append(line[result.end():]) |
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97 | inobject = 1 |
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98 | elif line.startswith("endobj") \ |
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99 | or line.startswith(">> endobj") \ |
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100 | or line.startswith(">>endobj") : |
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101 | # Handle previous object, if any |
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102 | if inobject : |
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103 | # only overwrite older versions of this object |
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104 | # same minor seems to be possible, so the latest one |
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105 | # found in the file will be the one we keep. |
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106 | # if we want the first one, just use > instead of >= |
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107 | oldobject = objects.setdefault(major, obj) |
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108 | if int(minor) >= oldobject.minori : |
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109 | objects[major] = obj |
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110 | # self.logdebug("Object(%i, %i) overwritten with Object(%i, %i)" % (oldobject.majori, oldobject.minori, obj.majori, obj.minori)) |
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111 | # self.logdebug("Object(%i, %i)" % (obj.majori, obj.minori)) |
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112 | inobject = 0 |
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113 | else : |
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114 | if inobject : |
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115 | obj.content.append(line) |
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116 | |
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117 | # Now we check each PDF object we've just created. |
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118 | newpageregexp = re.compile(r"(/Type)\s?(/Page)[/>\s]", re.I) |
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119 | pagecount = 0 |
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120 | for obj in objects.values() : |
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121 | content = "".join(obj.content) |
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122 | count = len(newpageregexp.findall(content)) |
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123 | if count and (content != r"<</Type /Page>>") : # Empty pages which are not rendered ? |
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124 | pagecount += count |
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125 | return pagecount |
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126 | |
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127 | def veryFastAndNotAlwaysCorrectgetJobSize(self) : |
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128 | """Counts pages in a PDF document.""" |
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129 | newpageregexp = re.compile(r"/Type\s*/Page[/>\s]") |
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130 | return len(newpageregexp.findall(self.infile.read())) |
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131 | |
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132 | def thisOneIsSlowButCorrectgetJobSize(self) : |
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133 | """Counts pages in a PDF document.""" |
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134 | oregexp = re.compile(r"\s+(\d+)\s+(\d+)\s+(obj\s*.+?\s*?endobj)", \ |
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135 | re.DOTALL) |
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136 | objtokeep = {} |
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137 | for (smajor, sminor, content) in oregexp.findall(self.infile.read()) : |
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138 | major = int(smajor) |
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139 | minor = int(sminor) |
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140 | (prevmin, prevcont) = objtokeep.get(major, (None, None)) |
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141 | if (minor >= prevmin) : # Handles both None and real previous minor |
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142 | objtokeep[major] = (minor, content) |
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143 | #if prevmin is not None : |
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144 | # self.logdebug("Object %i.%i overwritten with %i.%i" \ |
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145 | # % (major, prevmin, \ |
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146 | # major, minor)) |
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147 | #else : |
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148 | # self.logdebug("Object %i.%i OK" % (major, minor)) |
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149 | npregexp = re.compile(r"/Type\s*/Page[/>\s]") |
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150 | pagecount = 0 |
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151 | for (major, (minor, content)) in objtokeep.items() : |
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152 | count = len(npregexp.findall(content)) |
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153 | if count : |
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154 | emptycount = content.count("obj\n<< \n/Type /Page \n>> \nendobj") + content.count("obj\n<< \n/Type /Page \n\n>> \nendobj") # TODO : make this clean |
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155 | if not emptycount : |
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156 | self.logdebug("%i.%i : %s\n" % (major, minor, repr(content))) |
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157 | pagecount += count - emptycount |
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158 | return pagecount |
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