| 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 PBConvertBinaryFile;
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| 28 | use ReadTextFile;
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| 29 | use unicode;
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| 30 | use strict;
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| 31 | no strict 'refs'; # so we can use a var for filehandles (eg STDERR)
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| 32 |
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| 33 | sub BEGIN {
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| 34 | @PDFPlugin::ISA = ('PBConvertBinaryFile', 'ReadTextFile');
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| 35 | }
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| 36 |
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| 37 | my $convert_to_list =
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| 38 | [ { 'name' => "auto",
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| 39 | 'desc' => "{ConvertBinaryFile.convert_to.auto}" },
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| 40 | { 'name' => "html",
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| 41 | 'desc' => "{ConvertBinaryFile.convert_to.html}" },
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| 42 | { 'name' => "text",
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| 43 | 'desc' => "{ConvertBinaryFile.convert_to.text}" },
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| 44 | { 'name' => "pagedimg_jpg",
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| 45 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_jpg}"},
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| 46 | { 'name' => "pagedimg_gif",
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| 47 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_gif}"},
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| 48 | { 'name' => "pagedimg_png",
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| 49 | 'desc' => "{ConvertBinaryFile.convert_to.pagedimg_png}"},
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| 50 | ];
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| 51 |
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| 52 |
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| 53 | my $arguments =
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| 54 | [
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| 55 | { 'name' => "convert_to",
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| 56 | 'desc' => "{ConvertBinaryFile.convert_to}",
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| 57 | 'type' => "enum",
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| 58 | 'reqd' => "yes",
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| 59 | 'list' => $convert_to_list,
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| 60 | 'deft' => "html" },
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| 61 | { 'name' => "process_exp",
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| 62 | 'desc' => "{BasePlugin.process_exp}",
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| 63 | 'type' => "regexp",
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| 64 | 'deft' => &get_default_process_exp(),
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| 65 | 'reqd' => "no" },
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| 66 | { 'name' => "block_exp",
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| 67 | 'desc' => "{BasePlugin.block_exp}",
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| 68 | 'type' => "regexp",
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| 69 | 'deft' => &get_default_block_exp() },
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| 70 | { 'name' => "metadata_fields",
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| 71 | 'desc' => "{HTMLPlugin.metadata_fields}",
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| 72 | 'type' => "string",
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| 73 | 'deft' => "" },
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| 74 | { 'name' => "metadata_field_separator",
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| 75 | 'desc' => "{HTMLPlugin.metadata_field_separator}",
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| 76 | 'type' => "string",
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| 77 | 'deft' => "" },
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| 78 | { 'name' => "noimages",
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| 79 | 'desc' => "{PDFPlugin.noimages}",
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| 80 | 'type' => "flag" },
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| 81 | { 'name' => "allowimagesonly",
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| 82 | 'desc' => "{PDFPlugin.allowimagesonly}",
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| 83 | 'type' => "flag" },
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| 84 | { 'name' => "complex",
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| 85 | 'desc' => "{PDFPlugin.complex}",
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| 86 | 'type' => "flag" },
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| 87 | { 'name' => "nohidden",
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| 88 | 'desc' => "{PDFPlugin.nohidden}",
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| 89 | 'type' => "flag" },
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| 90 | { 'name' => "zoom",
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| 91 | 'desc' => "{PDFPlugin.zoom}",
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| 92 | 'deft' => "2",
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| 93 | 'range' => "1,3", # actually the range is 0.5-3
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| 94 | 'type' => "int" },
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| 95 | { 'name' => "use_sections",
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| 96 | 'desc' => "{PDFPlugin.use_sections}",
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| 97 | 'type' => "flag" },
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| 98 | { 'name' => "description_tags",
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| 99 | 'desc' => "{HTMLPlugin.description_tags}",
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| 100 | 'type' => "flag" }
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| 101 | ];
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| 102 |
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| 103 | my $options = { 'name' => "PDFPlugin",
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| 104 | 'desc' => "{PDFPlugin.desc}",
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| 105 | 'abstract' => "no",
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| 106 | 'inherits' => "yes",
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| 107 | 'srcreplaceable' => "yes", # Source docs in PDF can be replaced with GS-generated html
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| 108 | 'args' => $arguments };
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| 109 |
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| 110 | sub new {
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| 111 | my ($class) = shift (@_);
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| 112 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 113 | push(@$pluginlist, $class);
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| 114 |
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| 115 | push(@$inputargs,"-title_sub");
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| 116 | push(@$inputargs,'^(Page\s+\d+)?(\s*1\s+)?');
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| 117 |
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| 118 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 119 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 120 |
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| 121 | my $self = new PBConvertBinaryFile($pluginlist, $inputargs, $hashArgOptLists);
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| 122 |
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| 123 | if ($self->{'info_only'}) {
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| 124 | # don't worry about any options etc
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| 125 | return bless $self, $class;
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| 126 | }
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| 127 |
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| 128 | $self->{'filename_extension'} = "pdf";
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| 129 | $self->{'file_type'} = "PDF";
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| 130 |
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| 131 | # these are passed through to gsConvert.pl by ConvertBinaryFile.pm
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| 132 | my $zoom = $self->{"zoom"};
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| 133 | $self->{'convert_options'} = "-pdf_zoom $zoom";
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| 134 | $self->{'convert_options'} .= " -pdf_complex" if $self->{"complex"};
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| 135 | $self->{'convert_options'} .= " -pdf_nohidden" if $self->{"nohidden"};
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| 136 | $self->{'convert_options'} .= " -pdf_ignore_images" if $self->{"noimages"};
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| 137 | $self->{'convert_options'} .= " -pdf_allow_images_only" if $self->{"allowimagesonly"};
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| 138 |
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| 139 | # check convert_to
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| 140 | if ($self->{'convert_to'} eq "text" && $ENV{'GSDLOS'} =~ /^windows$/i) {
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| 141 | print STDERR "Windows does not support pdf to text. PDFs will be converted to HTML instead\n";
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| 142 | $self->{'convert_to'} = "html";
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| 143 | }
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| 144 | elsif ($self->{'convert_to'} eq "auto") {
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| 145 | # choose html ?? is this the best option
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| 146 | $self->{'convert_to'} = "html";
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| 147 | }
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| 148 | # set convert_to_plugin and convert_to_ext
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| 149 | $self->PBConvertBinaryFile::set_standard_convert_settings();
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| 150 |
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| 151 | my $secondary_plugin_name = $self->{'convert_to_plugin'};
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| 152 | my $secondary_plugin_options = $self->{'secondary_plugin_options'};
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| 153 |
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| 154 | if (!defined $secondary_plugin_options->{$secondary_plugin_name}) {
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| 155 | $secondary_plugin_options->{$secondary_plugin_name} = [];
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| 156 | }
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| 157 | my $specific_options = $secondary_plugin_options->{$secondary_plugin_name};
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| 158 |
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| 159 | # following title_sub removes "Page 1" added by pdftohtml, and a leading
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| 160 | # "1", which is often the page number at the top of the page. Bad Luck
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| 161 | # if your document title actually starts with "1 " - is there a better way?
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| 162 | push(@$specific_options , "-title_sub", '^(Page\s+\d+)?(\s*1\s+)?');
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| 163 | my $associate_tail_re = $self->{'associate_tail_re'};
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| 164 | if ((defined $associate_tail_re) && ($associate_tail_re ne "")) {
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| 165 | push(@$specific_options, "-associate_tail_re", $associate_tail_re);
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| 166 | }
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| 167 | push(@$specific_options, "-file_rename_method", "none");
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| 168 |
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| 169 | if ($secondary_plugin_name eq "HTMLPlugin") {
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| 170 | # pdftohtml always produces utf8
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| 171 | push(@$specific_options, "-input_encoding", "utf8");
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| 172 | push(@$specific_options, "-extract_language") if $self->{'extract_language'};
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| 173 | push(@$specific_options, "-processing_tmp_files");
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| 174 | # Instruct HTMLPlug (when eventually accessed through read_into_doc_obj)
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| 175 | # to extract these metadata fields from the HEAD META fields
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| 176 | if (defined $self->{'metadata_fields'} && $self->{'metadata_fields'} =~ /\S/) {
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| 177 | push(@$specific_options,"-metadata_fields",$self->{'metadata_fields'});
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| 178 | } else {
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| 179 | push(@$specific_options,"-metadata_fields","Title,GENERATOR,date,author<Creator>");
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| 180 | }
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| 181 | if (defined $self->{'metadata_field_separator'} && $self->{'metadata_field_separator'} =~ /\S/) {
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| 182 | push(@$specific_options,"-metadata_field_separator",$self->{'metadata_field_separator'});
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| 183 | }
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| 184 | if ($self->{'use_sections'} || $self->{'description_tags'}) {
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| 185 | $self->{'description_tags'} = 1;
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| 186 | push(@$specific_options, "-description_tags");
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| 187 | }
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| 188 | }
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| 189 | elsif ($secondary_plugin_name eq "PagedImagePlugin") {
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| 190 | push(@$specific_options, "-screenviewsize", "1000");
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| 191 | push(@$specific_options, "-enable_cache");
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| 192 | push(@$specific_options, "-processing_tmp_files");
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| 193 | }
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| 194 |
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| 195 | $self = bless $self, $class;
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| 196 | $self->load_secondary_plugins($class,$secondary_plugin_options,$hashArgOptLists);
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| 197 | return $self;
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| 198 | }
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| 199 |
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| 200 | sub get_default_process_exp {
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| 201 | my $self = shift (@_);
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| 202 |
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| 203 | return q^(?i)\.pdf$^;
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| 204 | }
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| 205 |
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| 206 | # so we don't inherit HTMLPlug's block exp...
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| 207 | sub get_default_block_exp {
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| 208 | return "";
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| 209 | }
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| 210 |
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| 211 | sub convert_post_process
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| 212 | {
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| 213 | my $self = shift (@_);
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| 214 | my ($conv_filename) = @_;
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| 215 |
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| 216 | my $outhandle=$self->{'outhandle'};
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| 217 |
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| 218 | #$self->{'input_encoding'} = "utf8"; # The output is always in utf8 (is it?? it is for html, but what about other types?)
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| 219 | #my ($language, $encoding) = $self->textcat_get_language_encoding ($conv_filename);
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| 220 |
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| 221 | # read in file ($text will be in utf8)
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| 222 | my $text = "";
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| 223 | # encoding will be utf8 for html files - what about other types? will we do this step for them anyway?
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| 224 | $self->read_file ($conv_filename, "utf8", "", \$text);
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| 225 |
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| 226 | # Calculate number of pages based on <a ...> tags (we have a <a name=1> etc
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| 227 | # for each page). Metadata based on this calculation not set until process()
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| 228 | #
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| 229 | # Note: this is done even if we are not breaking to document into pages as it might
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| 230 | # be useful to give an indication of document length in browser through setting
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| 231 | # num_pages as metadata.
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| 232 | my @pages = ($text =~ /\<[Aa] name=\"?\w+\"?>/ig);
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| 233 | my $num_pages = scalar(@pages);
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| 234 | $self->{'num_pages'} = $num_pages;
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| 235 |
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| 236 | if ($self->{'use_sections'}
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| 237 | && $self->{'converted_to'} eq "HTML") {
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| 238 |
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| 239 | print $outhandle "PDFPlugin: Calculating sections...\n";
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| 240 |
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| 241 | # we have "<a name=1></a>" etc for each page
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| 242 | # it may be <A name=
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| 243 | my @sections = split('<[Aa] name=', $text);
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| 244 |
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| 245 | my $top_section = "";
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| 246 |
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| 247 | if (scalar (@sections) == 1) { #only one section - no split!
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| 248 | print $outhandle "PDFPlugin: warning - no sections found\n";
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| 249 | } else {
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| 250 | $top_section .= shift @sections; # keep HTML header etc as top_section
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| 251 | }
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| 252 |
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| 253 | # handle first section specially for title? Or all use first 100...
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| 254 |
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| 255 | my $title = $sections[0];
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| 256 | $title =~ s/^\"?\w+\"?>//; # specific for pdftohtml...
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| 257 | $title =~ s/<\/([^>]+)><\1>//g; # (eg) </b><b> - no space
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| 258 | $title =~ s/<[^>]*>/ /g;
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| 259 | $title =~ s/(?: |\xc2\xa0)/ /g; # utf-8 for nbsp...
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| 260 | $title =~ s/^\s+//s;
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| 261 | $title =~ s/\s+$//;
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| 262 | $title =~ s/\s+/ /gs;
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| 263 | $title =~ s/^$self->{'title_sub'}// if ($self->{'title_sub'});
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| 264 | $title =~ s/^\s+//s; # in case title_sub introduced any...
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| 265 | $title = substr ($title, 0, 100);
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| 266 | $title =~ s/\s\S*$/.../;
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| 267 |
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| 268 |
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| 269 | if (scalar (@sections) == 1) { # no sections found
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| 270 | $top_section .= $sections[0];
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| 271 | @sections=();
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| 272 | } else {
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| 273 | $top_section .= "<!--<Section>\n<Metadata name=\"Title\">$title</Metadata>\n-->\n <!--</Section>-->\n";
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| 274 | }
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| 275 |
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| 276 | # add metadata per section...
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| 277 | foreach my $section (@sections) {
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| 278 | # section names are not always just digits, may be like "outline"
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| 279 | $section =~ s@^\"?(\w+)\"?></a>@@; # leftover from split expression...
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| 280 |
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| 281 | $title = $1; # Greenstone does magic if sections are titled digits
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| 282 | if (! defined($title) ) {
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| 283 | print STDERR "no title: $section\n";
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| 284 | $title = " "; # get rid of the undefined warning in next line
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| 285 | }
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| 286 | my $newsection = "<!-- from PDFPlugin -->\n<!-- <Section>\n";
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| 287 | $newsection .= "<Metadata name=\"Title\">" . $title
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| 288 | . "</Metadata>\n--><p>\n";
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| 289 | $newsection .= $section;
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| 290 | $newsection .= "<!--</Section>-->\n";
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| 291 | $section = $newsection;
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| 292 | }
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| 293 |
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| 294 | $text=join('', ($top_section, @sections));
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| 295 | }
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| 296 |
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| 297 | # turn any high bytes that aren't valid utf-8 into utf-8.
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| 298 | unicode::ensure_utf8(\$text);
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| 299 |
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| 300 | # Write it out again!
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| 301 | $self->utf8_write_file (\$text, $conv_filename);
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| 302 | }
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| 303 |
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| 304 |
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| 305 | # do plugin specific processing of doc_obj for HTML type
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| 306 | sub process {
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| 307 | my $self = shift (@_);
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| 308 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 309 |
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| 310 | my $result = $self->process_type($base_dir,$file,$doc_obj);
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| 311 |
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| 312 | # fix up the extracted date metadata to be in Greenstone date format,
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| 313 | # and fix the capitalisation of 'date'
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| 314 | my $cursection = $doc_obj->get_top_section();
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| 315 | foreach my $datemeta (@{$doc_obj->get_metadata($cursection, "date")}) {
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| 316 | $doc_obj->delete_metadata($cursection, "date", $datemeta);
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| 317 |
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| 318 | # We're just interested in the date bit, not the time
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| 319 | # some pdf creators (eg "Acrobat 5.0 Scan Plug-in for Windows")
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| 320 | # set a /CreationDate, and set /ModDate to 000000000. pdftohtml
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| 321 | # extracts the ModDate, so it is 0...
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| 322 | $datemeta =~ /(\d+)-(\d+)-(\d+)/;
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| 323 | my ($year, $month, $day) = ($1,$2,$3);
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| 324 | if (defined($year) && defined($month) && defined($day)) {
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| 325 | if ($year == 0) {next}
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| 326 | if ($year < 100) {$year += 1900} # just to be safe
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| 327 | if ($month =~ /^\d$/) {$month="0$month"} # single digit
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| 328 | if ($day =~ /^\d$/) {$day="0$day"} # single digit
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| 329 | my $date="$year$month$day";
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| 330 | $doc_obj->add_utf8_metadata($cursection, "Date", $date);
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| 331 | }
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| 332 | }
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| 333 |
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| 334 | $doc_obj->add_utf8_metadata($cursection, "NumPages", $self->{'num_pages'});
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| 335 |
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| 336 | if ($self->{'use_sections'} && $self->{'converted_to'} eq "HTML") {
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| 337 | # we explicitly make it a paged document, cos greenstone won't get it
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| 338 | # right if any section has an empty title, or one with letters in it
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| 339 | $doc_obj->set_utf8_metadata_element ($cursection, "gsdlthistype", "Paged");
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| 340 | }
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| 341 |
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| 342 | return $result;
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| 343 | }
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| 344 |
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| 345 | 1;
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