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 or 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 | # We try to convert Postscript files to text using "gs" which is often on
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38 | # *nix machines. If it isn't (or we're running on Windoze), we do some feeble
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39 | # text extraction on it using regexps.
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40 |
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41 | BEGIN {
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42 | die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
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43 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
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44 | }
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45 |
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46 | use parsargv;
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47 | use util;
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48 | use Cwd;
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49 | use File::Basename;
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50 |
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51 |
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52 | sub print_usage
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53 | {
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54 | print STDERR "\n";
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55 | print STDERR "gsConvert.pl: Converts documents in a range of formats to html\n";
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56 | print STDERR " or text using third-party programs.\n\n";
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57 | print STDERR " usage: $0 [options] filename\n";
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58 | print STDERR " options:\n\t-type\tdoc|pdf|ps\n\t-output\thtml|text\n";
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59 | print STDERR "\t-timeout\t<max cpu seconds>\n";
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60 | exit(1);
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61 | }
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62 |
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63 |
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64 | sub main
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65 | {
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66 | my (@ARGV) = @_;
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67 | my ($input_type,$output_type,$verbose,$timeout);
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68 |
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69 | $timeout = 0;
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70 | # read command-line arguments
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71 | if (!parsargv::parse(\@ARGV,
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72 | 'type/(doc|pdf|ps)/', \$input_type,
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73 | 'output/(html|text)/', \$output_type,
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74 | 'timeout/\d+/0',\$timeout,
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75 | 'verbose/\d+/0', \$verbose))
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76 | {
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77 | print_usage();
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78 | }
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79 |
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80 | # Make sure the input file exists and can be opened for reading
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81 | if (scalar(@ARGV!=1)) {
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82 | print_usage();
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83 | }
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84 |
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85 | my $input_filename = $ARGV[0];
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86 | if (!-r $input_filename) {
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87 | print STDERR "Error: unable to open $input_filename for reading\n";
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88 | exit(1);
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89 | }
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90 |
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91 | # Deduce filenames
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92 | my ($tailname,$dirname,$suffix)
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93 | = File::Basename::fileparse($input_filename,'\..+');
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94 | my $output_filestem = &util::filename_cat($dirname,"$tailname");
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95 |
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96 | if ($input_type eq "")
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97 | {
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98 | $input_type = substr($suffix,1,length($suffix)-1);
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99 | }
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100 |
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101 | # Change to temporary working directory
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102 | my $stored_dir = cwd();
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103 | chdir ($dirname) || die "Unable to change to directory $dirname";
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104 |
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105 | # Select convert utility
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106 | if (!defined $input_type) {
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107 | print STDERR "Error: No filename extension or input type defined\n";
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108 | exit(1);
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109 | }
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110 | elsif ($input_type eq "doc") {
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111 | print &convertDOC($input_filename, $output_filestem, $output_type);
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112 | print "\n";
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113 | }
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114 | elsif ($input_type eq "rtf") {
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115 | print &convertRTF($input_filename, $output_filestem, $output_type);
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116 | print "\n";
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117 | }
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118 | elsif ($input_type eq "pdf") {
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119 | print &convertPDF($dirname, $input_filename, $output_filestem, $output_type);
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120 | print "\n";
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121 | }
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122 | elsif ($input_type eq "ps") {
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123 | print &convertPS($input_filename, $output_filestem, $output_type);
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124 | print "\n";
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125 | }
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126 | else {
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127 | print STDERR "Error: Unable to convert type '$input_type'\n";
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128 | exit(1);
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129 | }
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130 |
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131 | # restore to original working directory
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132 | chdir ($stored_dir) || die "Unable to return to directory $stored_dir";
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133 |
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134 | }
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135 |
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136 | &main(@ARGV);
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137 |
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138 |
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139 |
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140 | # Document-type conversion fucntions
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141 | #
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142 | # The following functions attempt to convert documents from their
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143 | # input type to the specified output type. If no output type was
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144 | # given, then they first attempt HTML, and then TEXT.
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145 | #
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146 | # Each returns the output type ("html" or "text") or "fail" if no
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147 | # conversion is possible.
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148 |
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149 | # Convert a Microsoft word document
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150 |
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151 | sub convertDOC {
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152 | ($input_filename, $output_filestem, $output_type) = @_;
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153 |
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154 | # Many .doc files are not in fact word documents!
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155 | my $realtype = &find_docfile_type($input_filename);
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156 |
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157 | if ($realtype eq "word6" || $realtype eq "word7" || $realtype eq "word8") {
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158 | return &convertWord678($input_filename, $output_filestem, $output_type);
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159 | } elsif ($realtype eq "rtf") {
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160 | return &convertRTF($input_filename, $output_filestem, $output_type);
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161 | } else {
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162 | return &convertAnything($input_filename, $output_filestem, $output_type);
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163 | }
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164 | }
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165 |
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166 | # Convert a Microsoft word 6/7/8 document
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167 |
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168 | sub convertWord678 {
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169 | ($input_filename, $output_filestem, $output_type) = @_;
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170 |
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171 | my $success = 0;
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172 |
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173 | # Attempt specialised conversion to HTML
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174 | if (!$output_type || ($output_type =~ /html/i)) {
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175 | $success = &doc_to_html($input_filename, $output_filestem);
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176 | if ($success) {
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177 | return "html";
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178 | }
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179 | }
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180 |
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181 | return &convertAnything($input_filename, $output_filestem, $output_type);
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182 | }
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183 |
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184 |
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185 | # Convert a Rich Text Format (RTF) file
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186 |
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187 | sub convertRTF {
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188 | ($input_filename, $output_filestem, $output_type) = @_;
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189 |
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190 | my $success = 0;
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191 |
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192 | # Attempt specialised conversion to HTML
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193 | if (!$output_type || ($output_type =~ /html/i)) {
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194 | $success = &rtf_to_html($input_filename, $output_filestem);
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195 | if ($success) {
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196 | return "html";
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197 | }
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198 | }
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199 |
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200 | return &convertAnything($input_filename, $output_filestem, $output_type);
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201 | }
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202 |
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203 |
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204 | # Convert an unidentified file
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205 |
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206 | sub convertAnything {
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207 | ($input_filename, $output_filestem, $output_type) = @_;
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208 |
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209 | my $success = 0;
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210 |
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211 | # Attempt simple conversion to HTML
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212 | if (!$output_type || ($output_type =~ /html/i)) {
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213 | $success = &any_to_html($input_filename, $output_filestem);
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214 | if ($success) {
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215 | return "html";
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216 | }
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217 | }
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218 |
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219 | # Convert to text
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220 | if (!$output_type || ($output_type =~ /text/i)) {
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221 | $success = any_to_text($input_filename, $output_filestem);
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222 | if ($success) {
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223 | return "text";
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224 | }
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225 | }
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226 | return "fail";
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227 | }
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228 |
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229 |
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230 |
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231 | # Convert an Adobe PDF document
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232 |
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233 | sub convertPDF {
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234 | ($dirname, $input_filename, $output_filestem, $output_type) = @_;
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235 |
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236 | my $success = 0;
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237 |
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238 | # Attempt conversion to HTML
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239 | if (!$output_type || ($output_type =~ /html/i)) {
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240 | $success = &pdf_to_html($dirname, $input_filename, $output_filestem);
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241 | if ($success) {
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242 | return "html";
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243 | }
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244 | }
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245 |
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246 | # Attempt conversion to TEXT
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247 | if (!$output_type || ($output_type =~ /text/i)) {
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248 | $success = &pdf_to_text($input_filename, $output_filestem);
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249 | if ($success) {
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250 | return "text";
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251 | }
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252 | }
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253 |
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254 | return "fail";
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255 |
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256 | }
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257 |
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258 |
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259 | # Convert an Adobe PostScript document
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260 |
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261 | sub convertPS {
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262 | ($input_filename, $output_filestem, $output_type) = @_;
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263 |
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264 | my $success = 0;
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265 |
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266 | # Attempt conversion to TEXT
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267 | if (!$output_type || ($output_type =~ /text/i)) {
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268 | $success = &ps_to_text($input_filename, $output_filestem);
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269 | if ($success) {
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270 | return "text";
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271 | }
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272 | }
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273 |
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274 | return "fail";
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275 |
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276 | }
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277 |
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278 |
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279 | # Find the real type of a .doc file
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280 | #
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281 | # We seem to have a lot of files with a .doc extension that are .rtf
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282 | # files or Word 5 files. This function attempts to tell the difference.
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283 |
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284 | sub find_docfile_type {
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285 | ($input_filename) = @_;
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286 |
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287 | open(CHK, "<$input_filename");
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288 | binmode(CHK);
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289 | my $line = "";
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290 | my $first = 1;
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291 |
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292 | while (<CHK>) {
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293 |
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294 | $line = $_;
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295 |
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296 | if ($first) {
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297 | # check to see if this is an rtf file
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298 | if ($line =~ /^\{\\rtf/) {
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299 | close(CHK);
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300 | return "rtf";
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301 | }
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302 | }
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303 |
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304 | # is this is a word 6/7/8 document?
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305 | if ($line =~ /Word\.Document\.([678])/) {
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306 | close(CHK);
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307 | return "word$1";
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308 | }
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309 |
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310 | $first = 0;
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311 |
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312 | }
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313 |
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314 | return "unknown";
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315 | }
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316 |
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317 |
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318 |
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319 | # Specific type-to-type conversions
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320 | #
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321 | # Each of the following functions attempts to convert a document from
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322 | # a specific format to another. If they succeed yhey return 1 and leave
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323 | # the output document(s) in the appropriate place; if they fail they
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324 | # return 0 and delete any working files.
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325 |
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326 |
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327 | # Attempt to convert a word document to html with the wv program
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328 |
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329 | sub doc_to_html {
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330 | ($input_filename, $output_filestem) = @_;
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331 |
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332 | my $wvWare = &util::filename_cat($ENV{'GSDLHOME'}, "bin",
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333 | $ENV{'GSDLOS'}, "wvWare");
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334 | $wvWare .= ".exe" if ($ENV{'GSDLOS'} =~ /^windows$/i);
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335 | return 0 unless (-e "$wvWare");
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336 |
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337 | my $wv_conf = &util::filename_cat($ENV{'GSDLHOME'}, "packages",
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338 | "wv", "wvHtml.xml");
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339 |
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340 | $cmd = "";
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341 | if ($timeout) {$cmd = "ulimit -t $timeout;";}
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342 | $cmd .= "$wvWare --charset utf-8 --config $wv_conf";
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343 | $cmd .= " \"$input_filename\" > \"$output_filestem.html\" 2>\"$output_filestem.err\"";
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344 |
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345 | # execute the command
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346 | if (system($cmd)>0)
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347 | {
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348 | print STDERR "Error executing wv converter: $!. Continuing...\n";
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349 | }
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350 |
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351 | # Was the conversion successful?
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352 | if (-e "$output_filestem.html") {
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353 | open(TMP, "$output_filestem.html");
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354 | $line = <TMP>;
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355 | close(TMP);
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356 | if ($line && $line =~ /DOCTYPE HTML/) {
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357 | &util::rm("$output_filestem.err");
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358 | return 1;
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359 | } else {
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360 | # An error of some sort occurred
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361 | &util::rm("$output_filestem.html");
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362 | &util::rm("$output_filestem.err");
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363 | }
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364 | }
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365 |
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366 | return 0;
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367 | }
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368 |
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369 |
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370 | # Attempt to convert an RTF document to html with rtftohtml
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371 | #
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372 | # rtf2html isn't distributed with Greenstone because it is not
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373 | # distributed under teh GPL. If you know of a better solution,
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374 | # please let me know.
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375 |
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376 | sub rtf_to_html {
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377 | ($input_filename, $output_filestem) = @_;
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378 |
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379 | # formulate the command
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380 | my $r_cmd = &util::filename_cat($ENV{'GSDLHOME'}, "packages", "unix",
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381 | "rtf2html", "rtf2html", "rtf2html");
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382 | $r_cmd = "rtf2html" unless (-e "$r_cmd");
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383 | return 0 unless (-e "$r_cmd");
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384 | $cmd = "";
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385 | if ($timeout) {$cmd = "ulimit -t $timeout;";}
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386 | $cmd .= "$r_cmd";
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387 | $cmd .= " \"$input_filename\" > \"$output_filestem.html\" 2>\"$output_filestem.err\"";
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388 |
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389 | # execute the command
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390 | if (system($cmd)>0)
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391 | {
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392 | print STDERR "Error executing rtf converter: $!. Continuing...\n";
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393 | }
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394 |
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395 | # Was the conversion successful?
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396 | if (-e "$output_filestem.html") {
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397 | open(TMP, "$output_filestem.html");
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398 | $line = <TMP>;
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399 | close(TMP);
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400 | if ($line && $line =~ /DOCTYPE HTML/) {
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401 | &util::rm("$output_filestem.err");
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402 | return 1;
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403 | } else {
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404 | # An error of some sort occurred
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405 | &util::rm("$output_filestem.html");
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406 | &util::rm("$output_filestem.err");
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407 | }
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408 | }
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409 | return 0;
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410 | }
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411 |
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412 |
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413 | # Convert a pdf file to html with the pdftohtml command
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414 |
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415 | sub pdf_to_html {
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416 | ($dirname, $input_filename, $output_filestem) = @_;
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417 |
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418 | $cmd = "";
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419 | if ($timeout) {$cmd = "ulimit -t $timeout;";}
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420 | $cmd .= "pdftohtml.pl -F ";
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421 | $cmd .= " \"$input_filename\" \"$output_filestem\"";
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422 |
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423 | if (system($cmd)!=0)
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424 | {
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425 | print STDERR "Error executing $cmd: $!\n";
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426 | return 0;
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427 | }
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428 |
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429 | # make sure the converter made something
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430 | if (! -e "$output_filestem.html")
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431 | {
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432 | &util::rm("$output_filestem.out") if (-e "$output_filestem.out");
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433 | # print out the converters std err, if any
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434 | if (-e "$output_filestem.err") {
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435 | open (ERRLOG, "$output_filestem.err") || die "$!";
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436 | print STDERR "pdftohtml:\n";
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437 | while (<ERRLOG>) {
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438 | print STDERR "$_";
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439 | }
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440 | close ERRLOG;
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441 | }
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442 | return 0;
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443 | }
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444 |
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445 | &util::rm("$output_filestem.out") if (-e "$output_filestem.out");
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446 | return 1;
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447 | }
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448 |
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449 | # Convert a PDF file to text with the pdftotext command
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450 |
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451 | sub pdf_to_text {
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452 | ($dirname, $input_filename, $output_filestem) = @_;
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453 |
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454 | $cmd = "pdftotext \"$input_filename\" > \"$output_filestem.text\"";
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455 | $cmd .= " 2> $output_filestem.err";
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456 |
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457 | if (system($cmd)>0)
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458 | {
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459 | print STDERR "Error executing $cmd: $!\n";
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460 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
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461 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
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462 | return 0;
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463 | }
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464 |
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465 | # make sure the converter made something
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466 | if (! -e "$output_filestem.html")
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467 | {
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468 | &util::rm("$output_filestem.out") if (-e "$output_filestem.out");
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469 | # print out the converters std err, if any
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470 | if (-e "$output_filestem.err") {
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471 | open (ERRLOG, "$output_filestem.err") || die "$!";
|
---|
472 | print STDERR "pdftotext:\n";
|
---|
473 | while (<ERRLOG>) {
|
---|
474 | print STDERR "$_";
|
---|
475 | }
|
---|
476 | close ERRLOG;
|
---|
477 | }
|
---|
478 | return 0;
|
---|
479 | }
|
---|
480 |
|
---|
481 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
|
---|
482 | return 1;
|
---|
483 | }
|
---|
484 |
|
---|
485 | # Convert a PostScript document to text
|
---|
486 | # note - just using "ps2ascii" isn't good enough, as it
|
---|
487 | # returns 0 for a postscript interpreter error. ps2ascii is just
|
---|
488 | # a wrapper to "gs" anyway, so we use that cmd here.
|
---|
489 |
|
---|
490 | sub ps_to_text {
|
---|
491 | ($input_filename, $output_filestem) = @_;
|
---|
492 |
|
---|
493 | my $cmd = "gs -q -dNODISPLAY -dNOBIND -dWRITESYSTEMDICT -dSIMPLE -c save ";
|
---|
494 | $cmd .= "-f ps2ascii.ps \"$input_filename\" -c quit > \"$output_filestem.text\"";
|
---|
495 | $cmd .= " 2> $output_filestem.err";
|
---|
496 | $!=0;
|
---|
497 | my $retcode=system($cmd);
|
---|
498 | $retcode = $? >> 8; # see man perlfunc - system for this...
|
---|
499 | # if system returns -1 | 127 (couldn't start program), look at $! for message
|
---|
500 | my $error="";
|
---|
501 | if ($retcode!=0) {if ($!) {$error=$!;} else {$error="couldn't run.\n";}}
|
---|
502 | elsif (! -e "$output_filestem.text") {
|
---|
503 | $error="did not create output file.\n";
|
---|
504 | }
|
---|
505 | else
|
---|
506 | { # make sure the interpreter didn't get an error. It is technically
|
---|
507 | # possible for the actual text to start with this, but....
|
---|
508 | open PSOUT, "$output_filestem.text";
|
---|
509 | if (<PSOUT> =~ /^Error: (.*)/) {
|
---|
510 | $error="interpreter error - \"$1\"";
|
---|
511 | }
|
---|
512 | close PSOUT;
|
---|
513 | }
|
---|
514 | if ($error ne "")
|
---|
515 | {
|
---|
516 | print STDERR "PSPLUG: WARNING: Error executing gs: $error\n";
|
---|
517 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
|
---|
518 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
|
---|
519 |
|
---|
520 | # Fine then. We'll just do a lousy job by ourselves...
|
---|
521 | # Based on 5-line regexp sed script found at:
|
---|
522 | # http://snark.ptc.spbu.ru/mail-archives/lout/brown/msg00003.html
|
---|
523 | #
|
---|
524 | print STDERR "PSPlug: Stripping text from postscript\n";
|
---|
525 | my $errorcode=0;
|
---|
526 | open (IN, "$input_filename")
|
---|
527 | || ($errorcode=1, warn "Couldn't read file: $!");
|
---|
528 | open (OUT, ">$output_filestem.text")
|
---|
529 | || ($errorcode=1, warn "Couldn't write file: $!");
|
---|
530 | if ($errorcode) {print STDERR "errors\n";return 0;}
|
---|
531 |
|
---|
532 | my $text=""; # this is for whole .ps file...
|
---|
533 | while (<IN>) {
|
---|
534 | $text.=$_;
|
---|
535 | }
|
---|
536 | close IN;
|
---|
537 |
|
---|
538 | # if ps has Page data, then use it to delete all stuff before it.
|
---|
539 | $text =~ s/^.*?%%Page:.*?\n//s; # treat string as single line
|
---|
540 |
|
---|
541 | # remove all leading non-data stuff
|
---|
542 | $text =~ s/^.*?\(//s;
|
---|
543 |
|
---|
544 | # remove all newline chars for easier processing
|
---|
545 | $text =~ s/\n//g;
|
---|
546 |
|
---|
547 | # Big assumption here - assume that if any co-ordinates are
|
---|
548 | # given, then we are at the end of a sentence.
|
---|
549 | $text =~ s/\)-?\d+\ -?\d+/\) \(\n\)/g;
|
---|
550 |
|
---|
551 | # special characters--
|
---|
552 | $text =~ s/\(\|\)/\(\ - \)/g; # j -> em-dash?
|
---|
553 |
|
---|
554 | # ? ps text formatting (eg italics?) ?
|
---|
555 | $text =~ s/Fn\(f\)/\(\{\)/g; # f -> {
|
---|
556 | $text =~ s/Fn\(g\)/\(\}\)/g; # g -> }
|
---|
557 | $text =~ s/Fn\(j\)/\(\|\)/g; # j -> |
|
---|
558 | # default - remove the rest
|
---|
559 | $text =~ s/\ ?F.\((.+?)\)/\($1\)/g;
|
---|
560 |
|
---|
561 | # attempt to add whitespace between words...
|
---|
562 | # this is based purely on observation, and may be completely wrong...
|
---|
563 | $text =~ s/([^F])[defghijkuy]\(/$1 \( /g;
|
---|
564 | # eg I notice "b(" is sometimes NOT a space if preceded by a
|
---|
565 | # negative number.
|
---|
566 | $text =~ s/\)\d+ ?b\(/\) \( /g;
|
---|
567 |
|
---|
568 | # change quoted braces to brackets
|
---|
569 | $text =~ s/([^\\])\\\(/$1\{/g;
|
---|
570 | $text =~ s/([^\\])\\\)/$1\}/g ;
|
---|
571 |
|
---|
572 | # remove everything that is not between braces
|
---|
573 | $text =~ s/\)([^\(\)])+?\(//sg ;
|
---|
574 |
|
---|
575 | # remove any Trailer eof stuff.
|
---|
576 | $text =~ s/\)[^\)]*$//sg;
|
---|
577 |
|
---|
578 | ### ligatures have special characters...
|
---|
579 | $text =~ s/\\013/ff/g;
|
---|
580 | $text =~ s/\\014/fi/g;
|
---|
581 | $text =~ s/\\015/fl/g;
|
---|
582 | $text =~ s/\\016/ffi/g;
|
---|
583 | $text =~ s/\\214/fi/g;
|
---|
584 | $text =~ s/\\215/fl/g;
|
---|
585 | $text =~ s/\\017/\n\* /g; # asterisk?
|
---|
586 | $text =~ s/\\023/\023/g; # e acute ('e)
|
---|
587 | $text =~ s/\\177/\252/g; # u"
|
---|
588 | # $text =~ s/ ?? /\344/g; # a"
|
---|
589 |
|
---|
590 | print OUT "$text";
|
---|
591 | close OUT;
|
---|
592 | }
|
---|
593 | &util::rm("$output_filestem.err") if (-e "$output_filestem.err");
|
---|
594 | return 1;
|
---|
595 | }
|
---|
596 |
|
---|
597 |
|
---|
598 | # Convert any file to HTML with a crude perl implementation of the
|
---|
599 | # UNIX strings command.
|
---|
600 |
|
---|
601 | sub any_to_html {
|
---|
602 | ($input_filename, $output_filestem) = @_;
|
---|
603 |
|
---|
604 | # First generate a text file
|
---|
605 | return 0 unless (&any_to_text($input_filename, $output_filestem));
|
---|
606 |
|
---|
607 | # create an HTML file from the text file
|
---|
608 | open(TEXT, "<$output_filestem.text");
|
---|
609 | open(HTML, ">$output_filestem.html");
|
---|
610 |
|
---|
611 | print HTML '<html><head>
|
---|
612 | <META HTTP-EQUIV="Content-Type" CONTENT="text/html">
|
---|
613 | <META NAME="GENERATOR" CONTENT="Greenstone any_to_html">
|
---|
614 | </head><body>';
|
---|
615 | print HTML "\n\n";
|
---|
616 |
|
---|
617 | while (<TEXT>) {
|
---|
618 | print HTML "<p> ", $_;
|
---|
619 |
|
---|
620 | }
|
---|
621 | print HTML "\n</body></html>\n";
|
---|
622 |
|
---|
623 | &util::rm("$output_filestem.text") if (-e "$output_filestem.text");
|
---|
624 | return 1;
|
---|
625 | }
|
---|
626 |
|
---|
627 | # Convert any file to TEXT with a crude perl implementation of the
|
---|
628 | # UNIX strings command.
|
---|
629 |
|
---|
630 | sub any_to_text {
|
---|
631 | ($input_filename, $output_filestem) = @_;
|
---|
632 |
|
---|
633 | open(IN, "<$input_filename");
|
---|
634 | binmode(IN);
|
---|
635 | open(OUT, ">$output_filestem.text");
|
---|
636 |
|
---|
637 | my ($line);
|
---|
638 | my $dgcount = 0;
|
---|
639 | while (<IN>) {
|
---|
640 | $line = $_;
|
---|
641 |
|
---|
642 | # delete anything that isn't a printable character
|
---|
643 | $line =~ s/[^\040-\176]+/\n/sg;
|
---|
644 |
|
---|
645 | # delete any string less than 10 characters long
|
---|
646 | $line =~ s/^.{0,9}$/\n/mg;
|
---|
647 | while ($line =~ /^.{1,9}$/m) {
|
---|
648 | $line =~ s/^.{0,9}$/\n/mg;
|
---|
649 | $line =~ s/\n+/\n/sg;
|
---|
650 | }
|
---|
651 |
|
---|
652 | # remove extraneous whitespace
|
---|
653 | $line =~ s/\n+/\n/gs;
|
---|
654 | $line =~ s/^\n//gs;
|
---|
655 |
|
---|
656 | # output whatever is left
|
---|
657 | if ($line =~ /[^\n ]/) {
|
---|
658 | print OUT $line;
|
---|
659 | }
|
---|
660 | }
|
---|
661 | return 1;
|
---|
662 | }
|
---|