| 1 | ###########################################################################
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| 2 | #
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| 3 | # PDFBoxConverter - helper plugin that does pdf document conversion with PDFBox
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2010 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 | package PDFBoxConverter;
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| 27 |
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| 28 | use BaseMediaConverter;
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| 29 |
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| 30 | use strict;
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| 31 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 32 | no strict 'subs'; # allow barewords (eg STDERR) as function arguments
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| 33 |
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| 34 | #use HTML::Entities; # for encoding characters into their HTML entities when PDFBox converts to text
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| 35 |
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| 36 | use gsprintf 'gsprintf';
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| 37 | use FileUtils;
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| 38 |
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| 39 | # these two variables mustn't be initialised here or they will get stuck
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| 40 | # at those values.
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| 41 | our $pdfbox_conversion_available;
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| 42 | our $no_pdfbox_conversion_reason;
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| 43 |
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| 44 | BEGIN {
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| 45 | @PDFBoxConverter::ISA = ('BaseMediaConverter');
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| 46 |
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| 47 | # Check that PDFBox is installed and available on the path
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| 48 | $pdfbox_conversion_available = 1;
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| 49 | $no_pdfbox_conversion_reason = "";
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| 50 |
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| 51 | if (!defined $ENV{'GEXT_PDFBOX'}) {
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| 52 | $pdfbox_conversion_available = 0;
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| 53 | $no_pdfbox_conversion_reason = "gextpdfboxnotinstalled";
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| 54 | }
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| 55 | else {
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| 56 | my $gextpb_home = $ENV{'GEXT_PDFBOX'};
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| 57 | my $pbajar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","pdfbox-app.jar");
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| 58 |
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| 59 | if (!-e $pbajar) {
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| 60 | &gsprintf(STDERR,"**** Failed to find $pbajar\n");
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| 61 | $pdfbox_conversion_available = 0;
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| 62 | $no_pdfbox_conversion_reason = "gextpdfboxjarnotinstalled";
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| 63 | }
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| 64 | else {
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| 65 | # test to see if java is in path
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| 66 | # Need to run java -version instead of just java, since the %ERRORLEVEL% returned
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| 67 | # for `java` (which is checked below for failure of the command) is 0 for JDK 1.6*
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| 68 | # while %ERRORLEVEL% is 1 for JDK 1.7*
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| 69 | # If `java -version` is run however, %ERRORLEVEL% returned is 0 if java is
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| 70 | # installed, regardless of whether the JDK version is 1.6* or 1.7*.
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| 71 | my $java = &util::get_java_command();
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| 72 |
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| 73 | my $cmd = "$java -version";
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| 74 | if ($ENV{'GSDLOS'} =~ /^windows/i) {
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| 75 | $cmd .= " >nul 2>&1"; # java 2>&1 >null or java >null 2>&1 both work (%ERRORLEVEL% is 0)
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| 76 | }
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| 77 | else {
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| 78 | # On Ubuntu, java >/dev/null 2>&1 works,
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| 79 | # but java 2>&1 >/dev/null doesn't work: output goes to screen anyway
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| 80 | $cmd .= " >/dev/null 2>&1"; # " >/dev/null 2>&1 &" - don't need & at end for Linux Centos anymore (Ubuntu was already fine without it)
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| 81 | }
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| 82 |
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| 83 | my $status = system($cmd);
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| 84 |
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| 85 | if ($status != 0) {
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| 86 |
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| 87 | my $error_message = "**** Testing for java\n";
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| 88 | $error_message .= "Failed to run: $cmd\n";
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| 89 | $error_message .= "Error variable: |$!| and status: $status\n";
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| 90 |
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| 91 | &gsprintf(STDERR, "PDFBoxConverter: $error_message");
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| 92 |
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| 93 | $pdfbox_conversion_available = 0;
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| 94 | $no_pdfbox_conversion_reason = "couldnotrunjava";
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| 95 | }
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| 96 | }
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| 97 | }
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| 98 |
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| 99 | }
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| 100 |
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| 101 | my $arguments = [ ];
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| 102 |
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| 103 | my $options = { 'name' => "PDFBoxConverter",
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| 104 | 'desc' => "{PDFBoxConverter.desc}",
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| 105 | 'abstract' => "yes",
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| 106 | 'inherits' => "yes",
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| 107 | 'args' => $arguments };
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| 108 |
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| 109 | sub new {
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| 110 | my ($class) = shift (@_);
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| 111 | my ($pluginlist,$inputargs,$hashArgOptLists,$auxilary) = @_;
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| 112 | push(@$pluginlist, $class);
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| 113 |
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| 114 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 115 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 116 |
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| 117 |
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| 118 | my $self = new BaseMediaConverter($pluginlist, $inputargs,
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| 119 | $hashArgOptLists, $auxilary);
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| 120 |
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| 121 | if ($self->{'info_only'}) {
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| 122 | # don't worry about any options etc
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| 123 | return bless $self, $class;
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| 124 | }
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| 125 | if ($pdfbox_conversion_available) {
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| 126 | my $gextpb_home = $ENV{'GEXT_PDFBOX'};
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| 127 | my $pbajar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","pdfbox-app.jar");
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| 128 | my $pb_jbig2_jar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","jbig2-imageio-3.0.1.jar");
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| 129 |
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| 130 | my $pb_jaicore_jar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","jai-imageio-core-1.4.0.jar");
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| 131 | my $pb_jaijpeg2000_jar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","jai-imageio-jpeg2000-1.4.0.jar");
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| 132 |
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| 133 | # Not including the following JPEG2000 jar, as it is under commercial license:
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| 134 | # https://github.com/jai-imageio/jai-imageio-jpeg2000 leading to https://bintray.com/jai-imageio/maven/jai-imageio-jpeg2000# (Files tab)
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| 135 | # my $pbjp2jar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","jai-imageio-jpeg2000-1.3.0.jar"); # jpeg2000
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| 136 |
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| 137 | my $java = &util::get_java_command();
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| 138 | $self->{'pdfbox_txt_launch_cmd'} = "$java -cp \"$pbajar\" org.apache.pdfbox.tools.ExtractText";
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| 139 | $self->{'pdfbox_html_launch_cmd'} = "$java -cp \"$pbajar\" -Dline.separator=\"<br />\" org.apache.pdfbox.tools.ExtractText";
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| 140 |
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| 141 | # We use this next cmd to launch our new custom PDFBox class (PDFBoxToImagesAndText.java) to convert each PDF page into an image (gif, jpg, png)
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| 142 | # AND its extracted text. Or just each page's extracted text. An item file is still generated,
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| 143 | # but this time referring to txtfiles too, not just the images. Result: searchable paged output.
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| 144 | # Our new custom class PDFBoxToImagesAndText.java lives in the new build folder, so add that to the classpath for the launch cmd
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| 145 | my $pdfbox_build = &FileUtils::filenameConcatenate($gextpb_home,"build");
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| 146 | # put the pdfbox jar, the jbig2-imageio library (Apache Software License 2.0)
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| 147 | # and our build folder containing our custom PDFBox class on the classpath
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| 148 | my $classpath = &util::pathname_cat($pbajar, $pb_jbig2_jar);
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| 149 |
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| 150 | if(!&FileUtils::filenameExists($pb_jaicore_jar)) {
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| 151 | $classpath = &util::pathname_cat($classpath, $pb_jaicore_jar);
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| 152 | }
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| 153 | if(!&FileUtils::filenameExists($pb_jaijpeg2000_jar)) {
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| 154 | $classpath = &util::pathname_cat($classpath, $pb_jaijpeg2000_jar);
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| 155 | }
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| 156 | $classpath = &util::pathname_cat($classpath, $pdfbox_build);
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| 157 |
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| 158 | # $self->{'pdfbox_img_launch_cmd'} = "java -cp \"$classpath\" org.apache.pdfbox.tools.PDFToImage"; # pdfbox 2.09 cmd for converting each PDF page to an image (jpg, png)
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| 159 | $self->{'pdfbox_imgtxt_launch_cmd'} = "java -cp \"$classpath\" org.greenstone.pdfbox.PDFBoxToImagesAndText";
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| 160 | }
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| 161 | else {
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| 162 | $self->{'no_pdfbox_conversion_reason'} = $no_pdfbox_conversion_reason;
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| 163 |
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| 164 | my $outhandle = $self->{'outhandle'};
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| 165 | &gsprintf($outhandle, "PDFBoxConverter: {PDFBoxConverter.noconversionavailable} ({PDFBoxConverter.$no_pdfbox_conversion_reason})\n");
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| 166 | }
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| 167 |
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| 168 | $self->{'pdfbox_conversion_available'} = $pdfbox_conversion_available;
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| 169 |
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| 170 | return bless $self, $class;
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| 171 |
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| 172 | }
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| 173 |
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| 174 | sub init {
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| 175 | my $self = shift(@_);
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| 176 | my ($verbosity, $outhandle, $failhandle) = @_;
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| 177 |
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| 178 | $self->{'pbtmp_file_paths'} = ();
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| 179 | }
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| 180 |
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| 181 | sub deinit {
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| 182 | my $self = shift(@_);
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| 183 |
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| 184 | $self->clean_up_temporary_files();
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| 185 | }
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| 186 |
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| 187 |
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| 188 | sub convert {
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| 189 | my $self = shift(@_);
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| 190 | my ($source_file_full_path, $target_file_type) = @_;
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| 191 |
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| 192 | return 0 unless $pdfbox_conversion_available;
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| 193 | # check the filename
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| 194 | return 0 if ( !-f $source_file_full_path);
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| 195 |
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| 196 | # Although PDFBoxConverter inherits from AutoLoadConverters and therefore
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| 197 | # doesn't go through gsConvert.pl, still set the -pdf_tool flag in convert_options
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| 198 | # in case in future PDFBoxConverter no longer inherits from AutoLoadConverters
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| 199 | # and ends up going through gsConvert.pl
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| 200 | $self->{'convert_options'} .= " -pdf_tool pdfbox";
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| 201 |
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| 202 | my $img_output_mode = 0;
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| 203 |
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| 204 | my $convert_to = $self->{'convert_to'};
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| 205 | my $paged_txt_output_mode = ($convert_to =~ /(pagedimgtxt|paged_text)/) ? 1 : 0;
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| 206 |
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| 207 | # the following line is necessary to avoid 'uninitialised variable' error
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| 208 | # messages concerning the converted_to member variable when PDFPlugin's
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| 209 | # use_sections option is checked.
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| 210 | # PDFBox plugin now processes use_sections option, when working with v1.5.0
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| 211 | # of the PDFBox jar file (which embeds each page in special <div> tags).
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| 212 | if ($target_file_type eq "html") {
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| 213 | $self->{'converted_to'} = "HTML";
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| 214 | } elsif ($target_file_type eq "jpg" || $target_file_type eq "png") { # || $target_file_type eq "gif"
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| 215 | # GIF not supported by PDFBox at present, see https://pdfbox.apache.org/1.8/commandline.html#pdftoimage
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| 216 | $self->{'converted_to'} = $target_file_type;
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| 217 | $img_output_mode = 1;
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| 218 | } else {
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| 219 | $self->{'converted_to'} = "text";
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| 220 | }
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| 221 |
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| 222 | my $outhandle = $self->{'outhandle'};
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| 223 | my $verbosity = $self->{'verbosity'};
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| 224 |
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| 225 | my $source_file_no_path = &File::Basename::basename($source_file_full_path);
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| 226 | # Determine the full name and path of the output file
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| 227 | my $target_file_path;
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| 228 |
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| 229 | if ($self->{'enable_cache'}) {
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| 230 | $self->init_cache_for_file($source_file_full_path);
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| 231 | my $cache_dir = $self->{'cached_dir'}; # full path to cache dir and file_root subdir inside it
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| 232 | my $file_root = $self->{'cached_file_root'}; # just the name of file_root subdir
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| 233 | #$file_root .= "_$convert_id" if ($convert_id ne "");
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| 234 |
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| 235 | # append the output filetype suffix only for non-image output formats, since for
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| 236 | # images we can be outputting multiple image files per single PDF input file
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| 237 | #my $target_file = ($img_output_mode || $paged_txt_output_mode) ? "" : "$file_root.$target_file_type";
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| 238 | my $target_file = ($img_output_mode || $paged_txt_output_mode) ? "pages" : "$file_root.$target_file_type";
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| 239 |
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| 240 | $target_file_path = &FileUtils::filenameConcatenate($cache_dir,$target_file);
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| 241 |
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| 242 | if($img_output_mode || $paged_txt_output_mode) {
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| 243 | if(!&FileUtils::directoryExists($target_file_path)) {
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| 244 | mkdir($target_file_path);
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| 245 | }
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| 246 | }
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| 247 |
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| 248 | # In this branch of the if-statement, we *don't* want this stored as part of 'pbtmp_file_path'
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| 249 | }
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| 250 | else {
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| 251 | # this is in gsdl/tmp. get a tmp filename in collection instead???
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| 252 | $target_file_path = &util::get_tmp_filename($target_file_type);
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| 253 |
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| 254 | # for image files, remove the suffix, since we can have many output image files
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| 255 | # per input PDF (one img for each page of the PDF, for example)
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| 256 | if($img_output_mode || $paged_txt_output_mode) {
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| 257 | $target_file_path =~ s/\.[^.]*$//g;
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| 258 |
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| 259 | if(!&FileUtils::directoryExists($target_file_path)) {
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| 260 | mkdir($target_file_path);
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| 261 | }
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| 262 |
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| 263 | # once the item file for the imgs has been created, need to adjust target_file_path
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| 264 |
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| 265 | # below, we'll store the dir just created to pbtmp_file_paths, so all imgs and the
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| 266 | # item file generated in it can be deleted in one go on clean_up
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| 267 | }
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| 268 |
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| 269 | push(@{$self->{'pbtmp_file_paths'}}, $target_file_path);
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| 270 | }
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| 271 |
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| 272 | # Generate and run the convert command
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| 273 | my $convert_cmd = "";
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| 274 |
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| 275 | # want the filename without extension, because any images
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| 276 | # are to be generated with the same filename as the PDF
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| 277 | my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($source_file_full_path, "\\.[^\\.]+\$");
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| 278 |
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| 279 | if($img_output_mode || $paged_txt_output_mode) { # converting each page to image and/or text
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| 280 | my $output_prefix = &FileUtils::filenameConcatenate($target_file_path, $tailname);
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| 281 |
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| 282 | # Our custom class does renaming of the pages (simplified to just numbers) for PagedImagePlugin
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| 283 | #$convert_cmd = $paged_txt_output_mode ? $self->{'pdfbox_imgtxt_launch_cmd'} : $self->{'pdfbox_img_launch_cmd'};
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| 284 | $convert_cmd = $self->{'pdfbox_imgtxt_launch_cmd'};
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| 285 | $convert_cmd .= " -imagesOnly" unless($paged_txt_output_mode); # set to images only unless there's text too
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| 286 | if($img_output_mode) { # whether images-only or images-and-text mode
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| 287 | $convert_cmd .= " -imageType $target_file_type";
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| 288 | $convert_cmd .= " -dpi ". $self->{"dpi"} if defined $self->{"dpi"};
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| 289 | } else { # img_output_mode off, so paged txt only and no images
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| 290 | $convert_cmd .= " -textOnly";
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| 291 | }
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| 292 |
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| 293 | $convert_cmd .= " -outputPrefix \"$output_prefix\"";
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| 294 | $convert_cmd .= " \"$source_file_full_path\"";
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| 295 |
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| 296 | } else { # single stream of text or html
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| 297 |
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| 298 | if ($target_file_type eq "html") {
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| 299 | $convert_cmd = $self->{'pdfbox_html_launch_cmd'};
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| 300 | $convert_cmd .= " -html" if ($target_file_type eq "html");
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| 301 | } else {
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| 302 | $convert_cmd = $self->{'pdfbox_txt_launch_cmd'};
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| 303 | }
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| 304 | $convert_cmd .= " \"$source_file_full_path\" \"$target_file_path\"";
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| 305 | }
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| 306 |
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| 307 | if ($verbosity>2) {
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| 308 | &gsprintf($outhandle,"Convert command: $convert_cmd\n");
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| 309 | }
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| 310 |
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| 311 | my $print_info = { 'message_prefix' => "PDFBox Conversion",
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| 312 | 'message' => "Converting $source_file_no_path to: $target_file_type" };
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| 313 | # $print_info->{'cache_mode'} = $cache_mode if ($cache_mode ne "");
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| 314 |
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| 315 | my ($regenerated,$result,$had_error)
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| 316 | = $self->autorun_general_cmd($convert_cmd,$source_file_full_path, $target_file_path,$print_info);
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| 317 |
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| 318 | if($img_output_mode || $paged_txt_output_mode) {
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| 319 | # now the images have been generated, generate the "$target_file_path/tailname.item"
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| 320 | # item file for them, which is also the target_file_path that needs to be returned
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| 321 | $target_file_path = &util::create_itemfile($target_file_path, $tailname, $target_file_type);
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| 322 | #print STDERR "**** item file: $target_file_path\n";
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| 323 | }
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| 324 | elsif ($self->{'converted_to'} eq "text") {
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| 325 | # ensure html entities are doubly escaped for pdfbox to text conversion: & -> &amp;
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| 326 | # conversion to html does it automatically, but conversion to text doesn't
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| 327 | # and this results in illegal characters in doc.xml
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| 328 |
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| 329 | my $fulltext = &FileUtils::readUTF8File($target_file_path);
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| 330 | if(defined $fulltext) {
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| 331 | #$fulltext = &HTML::Entities::encode($fulltext); # doesn't seem to help
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| 332 | $fulltext =~ s@&@&@sg; # Kathy's fix to ensure doc contents don't break XML
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| 333 | &FileUtils::writeUTF8File($target_file_path, \$fulltext);
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| 334 | } else {
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| 335 | print STDERR "PDFBoxConverter::convert(): Unable to read from converted file\n";
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| 336 | $had_error = 1;
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| 337 | }
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| 338 | }
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| 339 |
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| 340 | if ($had_error) {
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| 341 | return (0, $result,$target_file_path);
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| 342 | }
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| 343 | return (1, $result,$target_file_path);
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| 344 | }
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| 345 |
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| 346 | sub convert_without_result {
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| 347 | my $self = shift(@_);
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| 348 |
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| 349 | my $source_file_path = shift(@_);
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| 350 | my $target_file_type = shift(@_);
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| 351 | my $convert_options = shift(@_) || "";
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| 352 | my $convert_id = shift(@_) || "";
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| 353 |
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| 354 | return $self->convert($source_file_path,$target_file_type,
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| 355 | $convert_options,$convert_id,"without_result");
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| 356 | }
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| 357 |
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| 358 | sub clean_up_temporary_files {
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| 359 | my $self = shift(@_);
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| 360 |
|
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| 361 | foreach my $pbtmp_file_path (@{$self->{'pbtmp_file_paths'}}) {
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| 362 | if (-d $pbtmp_file_path) {
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| 363 | #print STDERR "@@@@@@ cleanup called on $pbtmp_file_path\n";
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| 364 | &FileUtils::removeFilesRecursive($pbtmp_file_path);
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| 365 | }
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| 366 | elsif (-e $pbtmp_file_path) {
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| 367 | &FileUtils::removeFiles($pbtmp_file_path);
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| 368 | }
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| 369 | }
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| 370 |
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| 371 | $self->{'pbtmp_file_paths'} = ();
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| 372 | }
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| 373 |
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| 374 |
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| 375 | 1;
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