1 | package OCRImageConverter;
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2 |
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3 | use BaseMediaConverter;
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4 |
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5 | use strict;
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6 | no strict 'refs'; # allow filehandles to be variables and viceversa
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7 | no strict 'subs'; # allow barewords (eg STDERR) as function arguments
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8 |
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9 | use gsprintf 'gsprintf';
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10 |
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11 | # these two variables mustn't be initialised here or they will get stuck
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12 | # at those values.
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13 | our $ocrimage_conversion_available;
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14 | our $no_ocrimage_conversion_reason;
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15 |
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16 | BEGIN {
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17 | @OCRImageConverter::ISA = ('BaseMediaConverter');
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18 |
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19 | # Check that PDFBox is installed and available on the path
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20 | $ocrimage_conversion_available = 1;
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21 |
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22 | if (!defined $ENV{'GEXTOCR'}) {
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23 | $ocrimage_conversion_available = 0;
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24 | $no_ocrimage_conversion_reason = "gextocrnotinstalled";
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25 | } else {
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26 | my $gextocr_home = $ENV{'GEXTOCR'};
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27 | #my $pbajar = &FileUtils::filenameConcatenate($gextpb_home,"lib","java","pdfbox-app.jar");
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28 | my $tesseract = &FileUtils::filenameConcatenate($gextocr_home, "installed", "cmdline", "bin", "tesseract");
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29 |
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30 | if (!-e $tesseract) {
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31 | &gsprintf(STDERR, "**** Failed to find $tesseract\n");
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32 | $ocrimage_conversion_available = 0;
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33 | $no_ocrimage_conversion_reason = "gexttesseractnotinstalled";
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34 | } else {
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35 | my $cmd = "\"$tesseract\" -v ";
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36 | if ($ENV{'GSDLOS'} =~ /^windows/i) {
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37 | $cmd .= " >nul 2>&1"; # java 2>&1 >null or java >null 2>&1 both work (%ERRORLEVEL% is 0)
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38 | } else {
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39 | # On Ubuntu, java >/dev/null 2>&1 works,
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40 | # but java 2>&1 >/dev/null doesn't work: output goes to screen anyway
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41 | $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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42 | }
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43 |
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44 | my $status = system($cmd);
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45 |
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46 | if ($status != 0) {
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47 | my $error_message = "**** Testing for Tesseract\n";
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48 | $error_message .= "Failed to run: $cmd\n";
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49 | $error_message .= "Error variable: |$!| and status: $status\n";
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50 |
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51 | &gsprintf(STDERR, "OCRImageConverter: $error_message");
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52 |
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53 | $ocrimage_conversion_available = 0;
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54 | $no_ocrimage_conversion_reason = "couldnotruntesseract";
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55 | }
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56 | }
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57 | }
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58 |
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59 | }
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60 |
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61 | my $arguments = [ ];
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62 |
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63 | my $options = {
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64 | 'name' => "OCRImageConverter",
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65 | 'desc' => "{OCRImageConverter.desc}",
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66 | 'abstract' => "yes",
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67 | 'inherits' => "yes",
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68 | 'args' => $arguments
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69 | };
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70 |
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71 | sub new {
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72 | my ($class) = shift (@_);
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73 | my ($pluginlist, $inputargs, $hashArgOptLists, $auxilary) = @_;
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74 | push(@$pluginlist, $class);
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75 |
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76 | push(@{$hashArgOptLists->{"ArgList"}}, @{$arguments});
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77 | push(@{$hashArgOptLists->{"OptList"}}, $options);
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78 |
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79 |
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80 | my $self = new BaseMediaConverter($pluginlist, $inputargs, $hashArgOptLists, $auxilary);
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81 |
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82 | if ($self->{'info_only'}) {
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83 | # don't worry about any options etc
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84 | return bless $self, $class;
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85 | }
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86 |
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87 | if ($ocrimage_conversion_available) {
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88 | my $gextocr_home = $ENV{'GEXTOCR'};
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89 | my $tesseract = &FileUtils::filenameConcatenate($gextocr_home, "installed", "cmdline", "bin", "tesseract");
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90 | my $lang = "eng"; # TODO
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91 | my $launch_cmd = "\"$tesseract\" -l $lang ";
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92 |
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93 | $self->{'ocrimage_launch_cmd'} = $launch_cmd;
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94 | } else {
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95 | $self->{'no_ocrimage_conversion_reason'} = $no_ocrimage_conversion_reason;
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96 |
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97 | my $outhandle = $self->{'outhandle'};
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98 | &gsprintf($outhandle, "OCRImageConverter: {OCRImageConverter.noconversionavailable} ({OCRImageConverter.$no_ocrimage_conversion_reason})\n");
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99 | }
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100 |
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101 | $self->{'ocrimage_conversion_available'} = $ocrimage_conversion_available;
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102 |
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103 | return bless $self, $class;
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104 | }
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105 |
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106 | sub init {
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107 | my $self = shift(@_);
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108 | my ($verbosity, $outhandle, $failhandle) = @_;
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109 |
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110 | $self->{'ocrtmp_file_paths'} = ();
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111 | }
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112 |
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113 | sub deinit {
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114 | my $self = shift(@_);
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115 |
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116 | $self->clean_up_temporary_files();
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117 | }
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118 |
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119 | sub convert {
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120 | my $self = shift(@_);
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121 | my ($source_file_full_path) = @_;
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122 |
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123 | print STDERR "***** WE ARE WORKING *****\n";
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124 |
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125 | # TODO cache
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126 | if (lc(substr($source_file_full_path, length($source_file_full_path) - 4)) eq ".gif") {
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127 | # need to convert to another format first
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128 | #my $target_source = substr($source_file_full_path, length($source_file_full_path) - 4) . ".tif";
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129 | my $converted_file = &util::get_tmp_filename("tif");
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130 | push(@{$self->{'ocrtmp_file_paths'}}, $converted_file);
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131 |
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132 | my $imagick_cmd = "\"" . &util::get_perl_exec() . "\" -S gs-magick.pl convert \"$source_file_full_path\" \"$converted_file\"";
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133 | system($imagick_cmd);
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134 |
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135 | print STDERR "*** Magick command: $imagick_cmd\n";
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136 |
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137 | $source_file_full_path = $converted_file;
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138 | print STDERR "*** Converted file: $converted_file\n";
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139 | }
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140 |
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141 | my $source_file_no_path = &File::Basename::basename($source_file_full_path);
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142 |
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143 | return 0 unless $ocrimage_conversion_available;
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144 | return 0 if (!-f $source_file_full_path);
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145 |
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146 | my $outhandle = $self->{'outhandle'};
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147 | my $verbosity = $self->{'verbosity'};
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148 |
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149 | my $target_file_path;
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150 |
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151 | if ($self->{'enable_cache'}) {
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152 | $self->init_cache_for_file($source_file_full_path);
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153 | my $cache_dir = $self->{'cached_dir'};
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154 | my $file_root = $self->{'cached_file_root'};
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155 |
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156 | $target_file_path = &FileUtils::filenameConcatenate($cache_dir, $file_root);
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157 | } else {
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158 | $target_file_path = &util::get_tmp_filename("txt");
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159 | push(@{$self->{'ocrtmp_file_paths'}}, $target_file_path);
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160 | }
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161 |
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162 | my $convert_cmd = "";
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163 | my ($tailname, $dirname, $suffix) = &File::Basename::fileparse($source_file_full_path, "\\.[^\\.]+\$");
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164 |
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165 | $convert_cmd = $self->{'ocrimage_launch_cmd'};
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166 | $convert_cmd .= " \"$source_file_full_path\" \"" . substr($target_file_path, 0, length($target_file_path) - 4) . "\"";
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167 |
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168 | #&gsprintf(STDERR, "OCRImageConverter convert command: $convert_cmd\n");
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169 | print STDERR "OCRImageConverter convert command: $convert_cmd\n";
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170 |
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171 | my $print_info = {
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172 | 'message_prefix' => "OCR Conversion",
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173 | 'message' => "Converting $source_file_no_path."
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174 | };
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175 |
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176 | my ($regenerated, $result, $had_error) = $self->autorun_general_cmd($convert_cmd, $source_file_full_path, $target_file_path, $print_info);
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177 |
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178 | if ($had_error) {
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179 | return (0, $result, $target_file_path);
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180 | } else {
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181 | return (1, $result, $target_file_path);
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182 | }
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183 | }
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184 |
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185 | sub convert_without_result {
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186 | my $self = shift(@_);
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187 |
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188 | my $source_file_path = shift(@_);
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189 | my $target_file_type = shift(@_);
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190 | my $convert_options = shift(@_) || "";
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191 | my $convert_id = shift(@_) || "";
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192 |
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193 | return $self->convert($source_file_path,$target_file_type,
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194 | $convert_options,$convert_id,"without_result");
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195 | }
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196 |
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197 | sub clean_up_temporary_files {
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198 | my $self = shift(@_);
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199 |
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200 | foreach my $ocrtmp_file_path (@{$self->{'ocrtmp_file_paths'}}) {
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201 | if (-d $ocrtmp_file_path) {
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202 | #print STDERR "@@@@@@ cleanup called on $pbtmp_file_path\n";
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203 | &FileUtils::removeFilesRecursive($ocrtmp_file_path);
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204 | } elsif (-e $ocrtmp_file_path) {
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205 | &FileUtils::removeFiles($ocrtmp_file_path);
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206 | }
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207 | }
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208 |
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209 | $self->{'ocrtmp_file_paths'} = ();
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210 | }
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211 |
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212 | 1;
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