1 | ###########################################################################
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2 | #
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3 | # PDFPlugin.pm -- reasonably with-it pdf plugin
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 1999-2001 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistribute it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 | package PDFPlugin;
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26 |
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27 | use strict;
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28 | no strict 'refs'; # so we can use a var for filehandles (e.g. STDERR)
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29 |
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30 | use ReadTextFile;
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31 | use unicode;
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32 |
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33 | use AutoLoadConverters;
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34 | use ConvertBinaryFile;
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35 |
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36 | @PDFPlugin::ISA = ('ConvertBinaryFile', 'AutoLoadConverters', 'ReadTextFile');
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37 |
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38 |
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39 | my $convert_to_list =
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40 | [ { 'name' => "auto",
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41 | 'desc' => "{ConvertBinaryFile.convert_to.auto}" },
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42 | { 'name' => "html",
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43 | 'desc' => "{ConvertBinaryFile.convert_to.html}" },
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44 | { 'name' => "text",
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45 | 'desc' => "{ConvertBinaryFile.convert_to.text}" },
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46 | { 'name' => "pagedimg_jpg",
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47 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_jpg}"},
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48 | { 'name' => "pagedimg_gif",
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49 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_gif}"},
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50 | { 'name' => "pagedimg_png",
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51 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_png}"},
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52 | ];
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53 |
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54 |
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55 | my $arguments =
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56 | [
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57 | { 'name' => "convert_to",
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58 | 'desc' => "{ConvertBinaryFile.convert_to}",
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59 | 'type' => "enum",
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60 | 'reqd' => "yes",
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61 | 'list' => $convert_to_list,
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62 | 'deft' => "html" },
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63 | { 'name' => "process_exp",
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64 | 'desc' => "{BaseImporter.process_exp}",
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65 | 'type' => "regexp",
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66 | 'deft' => &get_default_process_exp(),
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67 | 'reqd' => "no" },
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68 | { 'name' => "block_exp",
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69 | 'desc' => "{CommonUtil.block_exp}",
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70 | 'type' => "regexp",
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71 | 'deft' => &get_default_block_exp() },
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72 | { 'name' => "metadata_fields",
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73 | 'desc' => "{HTMLPlugin.metadata_fields}",
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74 | 'type' => "string",
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75 | 'deft' => "Title,Author,Subject,Keywords" },
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76 | { 'name' => "metadata_field_separator",
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77 | 'desc' => "{HTMLPlugin.metadata_field_separator}",
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78 | 'type' => "string",
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79 | 'deft' => "" },
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80 | { 'name' => "noimages",
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81 | 'desc' => "{PDFPlugin.noimages}",
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82 | 'type' => "flag" },
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83 | { 'name' => "allowimagesonly",
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84 | 'desc' => "{PDFPlugin.allowimagesonly}",
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85 | 'type' => "flag" },
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86 | { 'name' => "complex",
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87 | 'desc' => "{PDFPlugin.complex}",
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88 | 'type' => "flag" },
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89 | { 'name' => "nohidden",
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90 | 'desc' => "{PDFPlugin.nohidden}",
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91 | 'type' => "flag" },
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92 | { 'name' => "zoom",
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93 | 'desc' => "{PDFPlugin.zoom}",
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94 | 'deft' => "2",
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95 | 'range' => "1,3", # actually the range is 0.5-3
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96 | 'type' => "int" },
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97 | { 'name' => "use_sections",
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98 | 'desc' => "{PDFPlugin.use_sections}",
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99 | 'type' => "flag" },
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100 | { 'name' => "description_tags",
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101 | 'desc' => "{HTMLPlugin.description_tags}",
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102 | 'type' => "flag" },
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103 | { 'name' => "use_realistic_book",
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104 | 'desc' => "{PDFPlugin.use_realistic_book}",
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105 | 'type' => "flag"}
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106 | ];
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107 |
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108 | my $options = { 'name' => "PDFPlugin",
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109 | 'desc' => "{PDFPlugin.desc}",
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110 | 'abstract' => "no",
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111 | 'inherits' => "yes",
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112 | 'srcreplaceable' => "yes", # Source docs in PDF can be replaced with GS-generated html
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113 | 'args' => $arguments };
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114 |
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115 | sub new {
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116 | my ($class) = shift (@_);
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117 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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118 | push(@$pluginlist, $class);
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119 |
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120 | push(@$inputargs,"-title_sub");
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121 | push(@$inputargs,'^(Page\s+\d+)?(\s*1\s+)?');
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122 |
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123 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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124 | push(@{$hashArgOptLists->{"OptList"}},$options);
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125 |
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126 | my $auto_converter_self = new AutoLoadConverters($pluginlist,$inputargs,$hashArgOptLists,["PDFBoxConverter"],1);
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127 | my $cbf_self = new ConvertBinaryFile($pluginlist, $inputargs, $hashArgOptLists);
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128 | my $self = BaseImporter::merge_inheritance($auto_converter_self, $cbf_self);
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129 |
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130 | if ($self->{'info_only'}) {
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131 | # don't worry about any options etc
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132 | return bless $self, $class;
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133 | }
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134 |
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135 | $self = bless $self, $class;
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136 | $self->{'file_type'} = "PDF";
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137 |
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138 | # these are passed through to gsConvert.pl by ConvertBinaryFile.pm
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139 | my $zoom = $self->{"zoom"};
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140 | $self->{'convert_options'} = "-pdf_zoom $zoom";
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141 | $self->{'convert_options'} .= " -pdf_complex" if $self->{"complex"};
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142 | $self->{'convert_options'} .= " -pdf_nohidden" if $self->{"nohidden"};
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143 | $self->{'convert_options'} .= " -pdf_ignore_images" if $self->{"noimages"};
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144 | $self->{'convert_options'} .= " -pdf_allow_images_only" if $self->{"allowimagesonly"};
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145 |
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146 | # check convert_to
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147 | if ($self->{'convert_to'} eq "text" && $ENV{'GSDLOS'} =~ /^windows$/i) {
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148 | print STDERR "Windows does not support pdf to text. PDFs will be converted to HTML instead\n";
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149 | $self->{'convert_to'} = "html";
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150 | }
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151 | elsif ($self->{'convert_to'} eq "auto") {
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152 | # choose html ?? is this the best option
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153 | $self->{'convert_to'} = "html";
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154 | }
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155 | if ($self->{'use_realistic_book'}) {
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156 | if ($self->{'convert_to'} ne "html") {
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157 | print STDERR "PDFs will be converted to HTML for realistic book functionality\n";
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158 | $self->{'convert_to'} = "html";
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159 | }
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160 | }
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161 | # set convert_to_plugin and convert_to_ext
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162 | $self->set_standard_convert_settings();
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163 |
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164 | my $secondary_plugin_name = $self->{'convert_to_plugin'};
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165 | my $secondary_plugin_options = $self->{'secondary_plugin_options'};
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166 |
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167 | if (!defined $secondary_plugin_options->{$secondary_plugin_name}) {
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168 | $secondary_plugin_options->{$secondary_plugin_name} = [];
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169 | }
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170 | my $specific_options = $secondary_plugin_options->{$secondary_plugin_name};
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171 |
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172 | # following title_sub removes "Page 1" added by pdftohtml, and a leading
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173 | # "1", which is often the page number at the top of the page. Bad Luck
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174 | # if your document title actually starts with "1 " - is there a better way?
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175 | push(@$specific_options , "-title_sub", '^(Page\s+\d+)?(\s*1\s+)?');
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176 | my $associate_tail_re = $self->{'associate_tail_re'};
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177 | if ((defined $associate_tail_re) && ($associate_tail_re ne "")) {
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178 | push(@$specific_options, "-associate_tail_re", $associate_tail_re);
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179 | }
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180 | push(@$specific_options, "-file_rename_method", "none");
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181 |
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182 | if ($secondary_plugin_name eq "HTMLPlugin") {
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183 | # pdftohtml always produces utf8 - What about pdfbox???
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184 | # push(@$specific_options, "-input_encoding", "utf8");
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185 | push(@$specific_options, "-extract_language") if $self->{'extract_language'};
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186 | push(@$specific_options, "-processing_tmp_files");
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187 | # Instruct HTMLPlug (when eventually accessed through read_into_doc_obj)
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188 | # to extract these metadata fields from the HEAD META fields
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189 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'} =~ /\S/) {
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190 | push(@$specific_options,"-metadata_fields",$self->{'metadata_fields'});
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191 | } else {
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192 | push(@$specific_options,"-metadata_fields","Title,GENERATOR,date,author<Creator>");
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193 | }
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194 | if (defined $self->{'metadata_field_separator'} && $self->{'metadata_field_separator'} =~ /\S/) {
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195 | push(@$specific_options,"-metadata_field_separator",$self->{'metadata_field_separator'});
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196 | }
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197 | if ($self->{'use_sections'} || $self->{'description_tags'}) {
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198 | $self->{'description_tags'} = 1;
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199 | push(@$specific_options, "-description_tags");
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200 | }
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201 | if ($self->{'use_realistic_book'}) {
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202 | push(@$specific_options, "-use_realistic_book");
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203 | }
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204 | }
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205 | elsif ($secondary_plugin_name eq "PagedImagePlugin") {
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206 | push(@$specific_options, "-screenviewsize", "1000");
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207 | push(@$specific_options, "-enable_cache");
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208 | push(@$specific_options, "-processing_tmp_files");
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209 | }
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210 |
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211 | $self = bless $self, $class;
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212 | $self->load_secondary_plugins($class,$secondary_plugin_options,$hashArgOptLists);
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213 | return $self;
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214 | }
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215 |
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216 | sub get_default_process_exp {
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217 | my $self = shift (@_);
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218 |
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219 | return q^(?i)\.pdf$^;
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220 | }
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221 |
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222 | # so we don't inherit HTMLPlug's block exp...
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223 | sub get_default_block_exp {
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224 | return "";
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225 | }
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226 |
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227 | sub init {
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228 | my $self = shift (@_);
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229 |
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230 | # ConvertBinaryFile init
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231 | $self->SUPER::init(@_);
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232 | $self->AutoLoadConverters::init(@_);
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233 |
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234 | }
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235 |
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236 | sub begin {
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237 | my $self = shift (@_);
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238 |
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239 | $self->AutoLoadConverters::begin(@_);
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240 | $self->SUPER::begin(@_);
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241 |
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242 | }
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243 |
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244 | sub deinit {
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245 | my $self = shift (@_);
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246 |
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247 | $self->AutoLoadConverters::deinit(@_);
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248 | $self->SUPER::deinit(@_);
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249 |
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250 | }
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251 |
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252 | # By setting hashing to be on ga xml this ensures that two
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253 | # PDF files that are identical except for the metadata
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254 | # to hash to different values. Without this, when each PDF
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255 | # file is converted to HTML there is a chance that they
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256 | # will both be *identical* if the conversion utility does
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257 | # not embed the metadata in the generated HTML. This is
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258 | # certainly the case when PDFBOX is being used.
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259 |
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260 | # This change makes this convert to based plugin more
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261 | # consistent with the original vision that the same document
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262 | # with different metadata should
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263 | # be seen as different.
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264 |
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265 | sub get_oid_hash_type {
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266 | my $self = shift (@_);
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267 | return "hash_on_ga_xml";
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268 | }
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269 |
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270 |
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271 | sub tmp_area_convert_file {
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272 |
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273 | my $self = shift (@_);
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274 | return $self->AutoLoadConverters::tmp_area_convert_file(@_);
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275 |
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276 | }
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277 |
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278 | sub convert_post_process
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279 | {
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280 | my $self = shift (@_);
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281 | my ($conv_filename) = @_;
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282 |
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283 | my $outhandle=$self->{'outhandle'};
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284 |
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285 | #$self->{'input_encoding'} = "utf8"; # The output is always in utf8 (is it?? it is for html, but what about other types?)
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286 | #my ($language, $encoding) = $self->textcat_get_language_encoding ($conv_filename);
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287 |
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288 | # read in file ($text will be in utf8)
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289 | my $text = "";
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290 | # encoding will be utf8 for html files - what about other types? will we do this step for them anyway?
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291 | $self->read_file ($conv_filename, "utf8", "", \$text);
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292 |
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293 | # To support the use_sections option with PDFBox: Greenstone splits PDFs into pages for
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294 | # sections. The PDFPlugin code wants each new page to be prefixed with <a name=pagenum></a>,
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295 | # which it then splits on to generate page-based sections. However, that's not what PDFBox
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296 | # generates in its HTML output. Fortunately, PDFBox does have its own page-separator: it
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297 | # embeds each page in an extra div. The div opener is:
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298 | # <div style=\"page-break-before:always; page-break-after:always\">
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299 | # The PDFPlugin now looks for this and prefixes <a name=0></a> to each such div. (The
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300 | # pagenumber is fixed at 0 since I'm unable to work out how to increment the pagenum during
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301 | # a regex substitution even with regex extensions on.) Later, when we process each section
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302 | # to get the pagenum, PDFBox's output for this is pre-processed by having a loopcounter
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303 | # that increments the pagenum for each subsequent section.
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304 |
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305 | #$pdfbox_pageheader="\<div style=\"page-break-before:always; page-break-after:always\">";
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306 | my $loopcounter = 0; # used later on!
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307 | $text =~ s@\<div style=\"page-break-before:always; page-break-after:always\">@<a name=$loopcounter></a><div style=\"page-break-before:always; page-break-after:always\">@g;
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308 |
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309 |
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310 | # Calculate number of pages based on <a ...> tags (we have a <a name=1> etc
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311 | # for each page). Metadata based on this calculation not set until process()
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312 | #
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313 | # Note: this is done even if we are not breaking the document into pages as it might
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314 | # be useful to give an indication of document length in browser through setting
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315 | # num_pages as metadata.
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316 | # Clean html from low and hight surrogates D800âDFFF
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317 | $text =~ s@[\N{U+D800}-\N{U+DFFF}]@\ @g;
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318 | my @pages = ($text =~ m/\<[Aa] name=\"?\w+\"?>/ig); #<div style=\"?page-break-before:always; page-break-after:always\"?>
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319 | my $num_pages = scalar(@pages);
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320 | $self->{'num_pages'} = $num_pages;
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321 |
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322 | if ($self->{'use_sections'}
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323 | && $self->{'converted_to'} eq "HTML") {
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324 |
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325 | print $outhandle "PDFPlugin: Calculating sections...\n";
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326 |
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327 | # we have "<a name=1></a>" etc for each page
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328 | # it may be <A name=
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329 | my @sections = split('<[Aa] name=', $text);
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330 |
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331 | my $top_section = "";
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332 |
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333 | if (scalar (@sections) == 1) { #only one section - no split!
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334 | print $outhandle "PDFPlugin: warning - no sections found\n";
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335 | } else {
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336 | $top_section .= shift @sections; # keep HTML header etc as top_section
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337 | }
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338 |
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339 | # handle first section specially for title? Or all use first 100...
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340 |
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341 | my $title = $sections[0];
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342 | $title =~ s/^\"?\w+\"?>//; # specific for pdftohtml...
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343 | $title =~ s/<\/([^>]+)><\1>//g; # (eg) </b><b> - no space
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344 | $title =~ s/<[^>]*>/ /g;
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345 | $title =~ s/(?: |\xc2\xa0)/ /g; # utf-8 for nbsp...
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346 | $title =~ s/^\s+//s;
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347 | $title =~ s/\s+$//;
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348 | $title =~ s/\s+/ /gs;
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349 | $title =~ s/^$self->{'title_sub'}// if ($self->{'title_sub'});
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350 | $title =~ s/^\s+//s; # in case title_sub introduced any...
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351 | $title = substr ($title, 0, 100);
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352 | $title =~ s/\s\S*$/.../;
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353 |
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354 |
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355 | if (scalar (@sections) == 1) { # no sections found
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356 | $top_section .= $sections[0];
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357 | @sections=();
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358 | } else {
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359 | $top_section .= "<!--<Section>\n<Metadata name=\"Title\">$title</Metadata>\n-->\n <!--</Section>-->\n";
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360 | }
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361 |
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362 | # add metadata per section...
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363 | foreach my $section (@sections) {
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364 | # section names are not always just digits, may be like "outline"
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365 | $section =~ s@^\"?(\w+)\"?></a>@@; # leftover from split expression...
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366 |
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367 | $title = $1; # Greenstone does magic if sections are titled digits
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368 |
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369 | # A title of pagenum=0 means use_sections is being applied on output from PDFBox,
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370 | # which didn't originally have a <a name=incremented pagenumber></a> to split each page.
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371 | # Our Perl code then prefixed <a name=0></a> to it. Now need to increment the pagenum here:
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372 | if($loopcounter > 0 || ($title eq 0 && $loopcounter == 0)) { # implies use_sections with PDFBox
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373 | $title = ++$loopcounter;
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374 | }
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375 |
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376 | if (! defined($title) ) {
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377 | print STDERR "no title: $section\n";
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378 | $title = " "; # get rid of the undefined warning in next line
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379 | }
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380 | my $newsection = "<!-- from PDFPlugin -->\n<!-- <Section>\n";
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381 | $newsection .= "<Metadata name=\"Title\">" . $title
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382 | . "</Metadata>\n--><br />\n";
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383 | $newsection .= $section;
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384 | $newsection .= "<!--</Section>-->\n";
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385 | $section = $newsection;
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386 | }
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387 |
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388 | $text=join('', ($top_section, @sections));
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389 | }
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390 |
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391 | if ($self->{'use_sections'}
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392 | && $self->{'converted_to'} eq "text") {
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393 | print STDERR "**** When converting PDF to text, cannot apply use_sections\n";
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394 | }
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395 |
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396 |
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397 | # The following should no longer be needed, now that strings
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398 | # read in are Unicode aware (in the Perl sense) rather than
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399 | # raw binary strings that just happen to be UTF-8 compliant
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400 |
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401 | # turn any high bytes that aren't valid utf-8 into utf-8.
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402 | ## unicode::ensure_utf8(\$text);
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403 |
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404 | # Write it out again!
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405 | $self->utf8_write_file (\$text, $conv_filename);
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406 | }
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407 |
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408 |
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409 | # do plugin specific processing of doc_obj for HTML type
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410 | sub process {
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411 | my $self = shift (@_);
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412 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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413 |
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414 | my $result = $self->process_type($base_dir,$file,$doc_obj);
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415 |
|
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416 | # fix up the extracted date metadata to be in Greenstone date format,
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417 | # and fix the capitalisation of 'date'
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418 | my $cursection = $doc_obj->get_top_section();
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419 | foreach my $datemeta (@{$doc_obj->get_metadata($cursection, "date")}) {
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420 | $doc_obj->delete_metadata($cursection, "date", $datemeta);
|
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421 |
|
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422 | # We're just interested in the date bit, not the time
|
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423 | # some pdf creators (eg "Acrobat 5.0 Scan Plug-in for Windows")
|
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424 | # set a /CreationDate, and set /ModDate to 000000000. pdftohtml
|
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425 | # extracts the ModDate, so it is 0...
|
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426 | $datemeta =~ /(\d+)-(\d+)-(\d+)/;
|
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427 | my ($year, $month, $day) = ($1,$2,$3);
|
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428 | if (defined($year) && defined($month) && defined($day)) {
|
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429 | if ($year == 0) {next}
|
---|
430 | if ($year < 100) {$year += 1900} # just to be safe
|
---|
431 | if ($month =~ /^\d$/) {$month="0$month"} # single digit
|
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432 | if ($day =~ /^\d$/) {$day="0$day"} # single digit
|
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433 | my $date="$year$month$day";
|
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434 | $doc_obj->add_utf8_metadata($cursection, "Date", $date);
|
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435 | }
|
---|
436 | }
|
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437 |
|
---|
438 | $doc_obj->add_utf8_metadata($cursection, "NumPages", $self->{'num_pages'}) if defined $self->{'num_pages'};
|
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439 |
|
---|
440 | if ($self->{'use_sections'} && $self->{'converted_to'} eq "HTML") {
|
---|
441 | # For gs2 we explicitly make it a paged document, cos greenstone won't get it
|
---|
442 | # right if any section has an empty title, or one with letters in it
|
---|
443 | if (&util::is_gs3()) {
|
---|
444 | # but for gs3, paged docs currently use image slider which is ugly if there are no images
|
---|
445 | $doc_obj->set_utf8_metadata_element ($cursection, "gsdlthistype", "Hierarchy");
|
---|
446 | } else {
|
---|
447 | $doc_obj->set_utf8_metadata_element ($cursection, "gsdlthistype", "Paged");
|
---|
448 | }
|
---|
449 | }
|
---|
450 |
|
---|
451 | return $result;
|
---|
452 | }
|
---|
453 |
|
---|
454 | 1;
|
---|