1 | #!/usr/bin/perl -w
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2 |
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3 | ###########################################################################
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4 | #
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5 | # gsConvert.pl -- convert documents to HTML ot TEXT format
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6 | #
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7 | # A component of the Greenstone digital library software
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8 | # from the New Zealand Digital Library Project at the
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9 | # University of Waikato, New Zealand.
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10 | #
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11 | # Copyright (C) 1999 New Zealand Digital Library Project
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12 | #
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13 | # This program is free software; you can redistribute it and/or modify
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14 | # it under the terms of the GNU General Public License as published by
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15 | # the Free Software Foundation; either version 2 of the License, or
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16 | # (at your option) any later version.
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17 | #
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18 | # This program is distributed in the hope that it will be useful,
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19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 | # GNU General Public License for more details.
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22 | #
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23 | # You should have received a copy of the GNU General Public License
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24 | # along with this program; if not, write to the Free Software
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25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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26 | #
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27 | ###########################################################################
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28 |
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29 | # gsConvert.pl converts documents in a range of formats to HTML or TEXT
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30 | # by exploiting third-party programs. These are usually found in the
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31 | # $GSDLHOME/packages directory.
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32 | #
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33 | # Currently, we can convert Microsoft Word and Adobe PDF using specialised
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34 | # conversion utilities. We can convery any file to text with a perl
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35 | # implementation of the UNIX strings command.
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36 |
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37 |
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38 | BEGIN {
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39 | die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
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40 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
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41 | }
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42 |
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43 | use parsargv;
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44 | use util;
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45 | use Cwd;
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46 | use File::Basename;
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47 |
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48 |
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49 | sub print_usage
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50 | {
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51 | print STDERR "Usage: $0 [-type doc|pdf] [-output html|text] filename\n";
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52 | exit(1);
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53 | }
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54 |
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55 |
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56 | sub main
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57 | {
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58 | my (@ARGV) = @_;
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59 | my ($input_type,$output_type,$verbose);
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60 |
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61 | # read command-line arguments
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62 | if (!parsargv::parse(\@ARGV,
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63 | 'type/(doc|pdf)/', \$input_type,
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64 | 'output/(html|text)/', \$output_type,
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65 | 'verbose/\d+/0', \$verbose))
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66 | {
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67 | print_usage();
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68 | }
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69 |
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70 | # Make sure the input file exists and can be opened for reading
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71 | if (scalar(@ARGV!=1)) {
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72 | print_usage();
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73 | }
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74 | my $input_filename = $ARGV[0];
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75 | if (!-r $input_filename) {
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76 | print STDERR "Error: unable to open $input_filename for reading\n";
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77 | exit(1);
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78 | }
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79 |
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80 | # Deduce filenames
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81 | my ($tailname,$dirname,$suffix)
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82 | = File::Basename::fileparse($input_filename,'\..+');
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83 | my $output_filestem = &util::filename_cat($dirname,"$tailname");
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84 |
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85 | if ($input_type eq "")
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86 | {
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87 | $input_type = substr($suffix,1,length($suffix)-1);
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88 | }
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89 |
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90 | # Change to temporary working directory
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91 | my $stored_dir = cwd();
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92 | chdir ($dirname) || die "Unable to change to directory $dirname";
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93 |
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94 | # Select convert utility
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95 | if (!defined $input_type) {
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96 | print STDERR "Error: No filename extension or input type defined\n";
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97 | exit(1);
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98 | }
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99 | elsif ($input_type eq "doc") {
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100 | print &convertDOC($input_filename, $output_filestem, $output_type);
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101 | print "\n";
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102 | }
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103 | elsif ($input_type eq "pdf") {
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104 | print &convertPDF($dirname, $input_filename, $output_filestem, $output_type);
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105 | print "\n";
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106 | }
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107 | elsif ($input_type eq "ps") {
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108 | print &convertPS($input_filename, $output_filestem, $output_type);
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109 | print "\n";
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110 | }
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111 | else {
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112 | print STDERR "Error: Unable to convert type '$input_type'\n";
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113 | exit(1);
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114 | }
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115 |
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116 | # restore to original working directory
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117 | chdir ($stored_dir) || die "Unable to return to directory $stored_dir";
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118 |
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119 | }
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120 |
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121 | &main(@ARGV);
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122 |
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123 |
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124 |
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125 | # Document-type conversion fucntions
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126 | #
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127 | # The following functions attempt to convert documents from their
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128 | # input type to the specified output type. If no output type was
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129 | # given, then they first attempt HTML, and then TEXT.
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130 | #
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131 | # Each returns the output type ("html" or "text") or "fail" if no
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132 | # conversion is possible.
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133 |
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134 | # Convert a Microsoft word document
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135 |
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136 | sub convertDOC {
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137 | ($input_filename, $output_filestem, $output_type) = @_;
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138 |
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139 | # Many .doc files are not in fact word documents!
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140 | my $realtype = &find_docfile_type($input_filename);
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141 |
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142 | if ($realtype eq "word678") {
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143 | return &convertWord678($input_filename, $output_filestem, $output_type);
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144 | } elsif ($realtype eq "rtf") {
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145 | return &convertRTF($input_filename, $output_filestem, $output_type);
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146 | } else {
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147 | return &convertAnything($input_filename, $output_filestem, $output_type);
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148 | }
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149 | }
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150 |
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151 | # Convert a Microsoft word 6/7/8 document
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152 |
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153 | sub convertWord678 {
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154 | ($input_filename, $output_filestem, $output_type) = @_;
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155 |
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156 | my $success = 0;
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157 |
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158 | # Attempt specialised conversion to HTML
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159 | if (!$output_type || ($output_type =~ /html/i)) {
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160 | $success = &doc_to_html($input_filename, $output_filestem);
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161 | if ($success) {
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162 | return "html";
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163 | }
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164 | }
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165 |
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166 | return &convertAnything($input_filename, $output_filestem, $output_type);
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167 | }
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168 |
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169 |
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170 | # Convert a Rich Text Format (RTF) file
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171 |
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172 | sub convertRTF {
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173 | ($input_filename, $output_filestem, $output_type) = @_;
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174 |
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175 | my $success = 0;
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176 |
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177 | # Attempt specialised conversion to HTML
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178 | if (!$output_type || ($output_type =~ /html/i)) {
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179 | $success = &rtf_to_html($input_filename, $output_filestem);
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180 | if ($success) {
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181 | return "html";
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182 | }
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183 | }
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184 |
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185 | return &convertAnything($input_filename, $output_filestem, $output_type);
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186 | }
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187 |
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188 |
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189 | # Convert an unidentified file
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190 |
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191 | sub convertAnything {
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192 | ($input_filename, $output_filestem, $output_type) = @_;
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193 |
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194 | my $success = 0;
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195 |
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196 | # Attempt simple conversion to HTML
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197 | if (!$output_type || ($output_type =~ /html/i)) {
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198 | $success = &any_to_html($input_filename, $output_filestem);
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199 | if ($success) {
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200 | return "html";
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201 | }
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202 | }
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203 |
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204 | # Convert to text
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205 | if (!$output_type || ($output_type =~ /text/i)) {
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206 | $success = any_to_text($input_filename, $output_filestem);
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207 | if ($success) {
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208 | return "text";
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209 | }
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210 | }
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211 | return "fail";
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212 | }
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213 |
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214 |
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215 |
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216 | # Convert an Adobe PDF document
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217 |
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218 | sub convertPDF {
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219 | ($dirname, $input_filename, $output_filestem, $output_type) = @_;
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220 |
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221 | my $success = 0;
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222 |
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223 | # Attempt conversion to HTML
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224 | if (!$output_type || ($output_type =~ /html/i)) {
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225 | $success = &pdf_to_html($dirname, $input_filename, $output_filestem);
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226 | if ($success) {
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227 | return "html";
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228 | }
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229 | }
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230 |
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231 | # Attempt conversion to TEXT
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232 | if (!$output_type || ($output_type =~ /text/i)) {
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233 | $success = &pdf_to_text($input_filename, $output_filestem);
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234 | if ($success) {
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235 | return "text";
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236 | }
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237 | }
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238 |
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239 | return "fail";
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240 |
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241 | }
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242 |
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243 |
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244 | # Convert an Adobe PostScript document
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245 |
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246 | sub convertPS {
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247 | ($input_filename, $output_filestem, $output_type) = @_;
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248 |
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249 | my $success = 0;
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250 |
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251 | # Attempt conversion to TEXT
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252 | if (!$output_type || ($output_type =~ /text/i)) {
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253 | $success = &ps_to_text($input_filename, $output_filestem);
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254 | if ($success) {
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255 | return "text";
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256 | }
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257 | }
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258 |
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259 | return "fail";
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260 |
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261 | }
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262 |
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263 |
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264 | # Find the real type of a .doc file
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265 | #
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266 | # We seem to have alot of files with a .dco extension that are .rtf
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267 | # files or Word 5 files. This function attempts to tell the difference.
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268 |
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269 | sub find_docfile_type {
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270 | ($input_filename) = @_;
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271 |
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272 | open(CHK, "<$input_filename");
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273 | my $line = "";
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274 | my $first = 1;
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275 |
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276 | while (<CHK>) {
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277 |
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278 | $line = $_;
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279 |
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280 | if ($first) {
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281 | # check to see if this is an rtf file
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282 | if ($line =~ /^\{\\rtf/) {
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283 | close(CHK);
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284 | return "rtf";
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285 | }
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286 | }
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287 |
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288 | # is theis a word 6/7/8 document?
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289 | if ($line =~ /Word\.Document\.[678]/) {
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290 | close(CHK);
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291 | return "word678";
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292 | }
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293 |
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294 | $first = 0;
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295 |
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296 | }
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297 |
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298 | return "unknown";
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299 | }
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300 |
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301 |
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302 |
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303 | # Specific type-to-type cponversions
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304 | #
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305 | # Each of the following functions attempts to convert a document from
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306 | # a specific format to another. If they succeed yhey return 1 and leave
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307 | # the output document(s) in the appropriate place; if they fail they
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308 | # return 0 and delete any working files.
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309 |
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310 |
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311 | # Attempt to convert a word document to html with the wv program
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312 |
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313 | sub doc_to_html {
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314 | ($input_filename, $output_filestem) = @_;
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315 |
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316 | # formulate the command
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317 | my $wv_home = &util::filename_cat($ENV{'GSDLHOME'}, "packages", "unix", "wv");
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318 | my $wv_conf = &util::filename_cat($wv_home, "lib", "wv", "wvHtml.xml");
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319 | my $wvWare = &util::filename_cat($wv_home, "bin", "wvWare");
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320 | return 0 unless (-e "$wvWare");
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321 | $cmd = "ulimit -t 20;";
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322 | $cmd .= "$wvWare --charset utf-8 --config $wv_conf";
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323 | $cmd .= " \"$input_filename\" > \"$output_filestem.html\" 2>\"$output_filestem.err\"";
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324 |
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325 | # execute the command
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326 | if (system($cmd)>0)
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327 | {
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328 | print STDERR "Error executing wv converter: $!. Continuing...\n";
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329 | }
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330 |
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331 | # Was the conversion successful?
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332 | if (-e "$output_filestem.html") {
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333 | open(TMP, "$output_filestem.html");
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334 | $line = <TMP>;
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335 | close(TMP);
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336 | if ($line && $line =~ /DOCTYPE HTML/) {
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337 | &util::rm("$output_filestem.err");
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338 | return 1;
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339 | } else {
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340 | # An error of some sort occurred
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341 | &util::rm("$output_filestem.html");
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342 | &util::rm("$output_filestem.err");
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343 | }
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344 | }
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345 | return 0;
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346 | }
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347 |
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348 |
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349 | # Attempt to convert an RTF document to html with rtftohtml
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350 | #
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351 | # rtf2html isn't distributed with Greenstone because it is not
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352 | # distributed under teh GPL. If you know of a better solution,
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353 | # please let me know.
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354 |
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355 | sub rtf_to_html {
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356 | ($input_filename, $output_filestem) = @_;
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357 |
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358 | # formulate the command
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359 | my $r_cmd = &util::filename_cat($ENV{'GSDLHOME'}, "packages", "unix",
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360 | "rtf2html", "rtf2html", "rtf2html");
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361 | $r_cmd = "rtf2html" unless (-e "$r_cmd");
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362 | return 0 unless (-e "$r_cmd");
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363 | $cmd = "ulimit -t 20;";
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364 | $cmd .= "$r_cmd";
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365 | $cmd .= " \"$input_filename\" > \"$output_filestem.html\" 2>\"$output_filestem.err\"";
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366 |
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367 | # execute the command
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368 | if (system($cmd)>0)
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369 | {
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370 | print STDERR "Error executing rtf converter: $!. Continuing...\n";
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371 | }
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372 |
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373 | # Was the conversion successful?
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374 | if (-e "$output_filestem.html") {
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375 | open(TMP, "$output_filestem.html");
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376 | $line = <TMP>;
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377 | close(TMP);
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378 | if ($line && $line =~ /DOCTYPE HTML/) {
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379 | &util::rm("$output_filestem.err");
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380 | return 1;
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381 | } else {
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382 | # An error of some sort occurred
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383 | &util::rm("$output_filestem.html");
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384 | &util::rm("$output_filestem.err");
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385 | }
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386 | }
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387 | return 0;
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388 | }
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389 |
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390 |
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391 | # Convert a pdf file to html with the pdftohtml command
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392 |
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393 | sub pdf_to_html {
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394 | ($dirname, $input_filename, $output_filestem) = @_;
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395 |
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396 | $cmd = "pdftohtml -F -d $dirname -o \"$output_filestem.html\" \"$input_filename\"";
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397 | $cmd .= " > $output_filestem.out";
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398 |
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399 | if (system($cmd)>0)
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400 | {
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401 | print STDERR "Error executing $cmd: $!\n";
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402 | &util::rm("$output_filestem.html") if (-e "$output_filestem.html");
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403 | &util::rm("$output_filestem.out") if (-e "$output_filestem.out");
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404 | return 0;
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405 | }
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406 |
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407 | &util::rm("$output_filestem.out") if (-e "$output_filestem.out");
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408 | return 1;
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409 | }
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410 |
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411 |
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412 | # Convert a PDF file to text with the pdftotext command
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413 |
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414 | sub pdf_to_text {
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415 | ($dirname, $input_filename, $output_filestem) = @_;
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416 |
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417 | $cmd = "pdftotext \"$input_filename\" > \"$output_filestem.text\"";
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418 | $cmd .= " 2> $output_filestem.err";
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419 |
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420 | if (system($cmd)>0)
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421 | {
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422 | print STDERR "Error executing $cmd: $!\n";
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423 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
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424 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
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425 | return 0;
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426 | }
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427 |
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428 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
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429 | return 1;
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430 | }
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431 |
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432 |
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433 | # Convert a PostScript document to text with ps2ascii
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434 |
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435 | sub ps_to_text {
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436 | ($input_filename, $output_filestem) = @_;
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437 |
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438 | my $cmd = "ps2ascii \"$input_filename\" > \"$output_filestem.text\"";
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439 | $cmd .= " 2> $output_filestem.err";
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440 |
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441 | if (system($cmd)>0)
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442 | {
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443 | print STDERR "Error executing $cmd: $!\n";
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444 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
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445 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
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446 | return 0;
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447 | }
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448 |
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449 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
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450 | return 1;
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451 | }
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452 |
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453 |
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454 | # Convert any file to HTML with a crude perl implementation of the
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455 | # UNIX strings command.
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456 |
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457 | sub any_to_html {
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458 | ($input_filename, $output_filestem) = @_;
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459 |
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460 | # First generate a text file
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461 | return 0 unless (&any_to_text($input_filename, $output_filestem));
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462 |
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463 | # create an HTML file from the text file
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464 | open(TEXT, "<$output_filestem.text");
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465 | open(HTML, ">$output_filestem.html");
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466 |
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467 | print HTML '<html><head>
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468 | <META HTTP-EQUIV="Content-Type" CONTENT="text/html">
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469 | <META NAME="GENERATOR" CONTENT="Greenstone any_to_html">
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470 | </head><body>\n\n';
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471 | while (<TEXT>) {
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472 | print HTML "<p> ", $_;
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473 |
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474 | }
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475 | print HTML "\n</body></html>]\n";
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476 |
|
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477 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
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478 | return 1;
|
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479 | }
|
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480 |
|
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481 | # Convert any file to TEXT with a crude perl implementation of the
|
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482 | # UNIX strings command.
|
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483 |
|
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484 | sub any_to_text {
|
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485 | ($input_filename, $output_filestem) = @_;
|
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486 |
|
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487 | open(IN, "<$input_filename");
|
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488 | open(OUT, ">$output_filestem.text");
|
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489 |
|
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490 | my ($line);
|
---|
491 | while (<IN>) {
|
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492 | $line = $_;
|
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493 |
|
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494 | # delete anything that isn't a printable character
|
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495 | $line =~ s/[^\040-\176]+/\n/sg;
|
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496 |
|
---|
497 | # delete any string less than 10 characters long
|
---|
498 | $line =~ s/^[^\n]{0,9}$/\n/mg;
|
---|
499 | while ($line =~ /^[^\n]{1,9}$/m) {
|
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500 | $line =~ s/^[^\n]{0,9}$/\n/mg;
|
---|
501 | $line =~ s/\n+/\n/sg;
|
---|
502 | }
|
---|
503 |
|
---|
504 | # remove extraneous whitespace
|
---|
505 | $line =~ s/\n+/\n/gs;
|
---|
506 | $line =~ s/^\n//gs;
|
---|
507 |
|
---|
508 | # output whatever is left
|
---|
509 | if ($line =~ /[^\n ]/) {
|
---|
510 | print OUT $line;
|
---|
511 | }
|
---|
512 | }
|
---|
513 | return 1;
|
---|
514 | }
|
---|
515 |
|
---|
516 |
|
---|
517 |
|
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