/usr/share/perl5/Image/ExifTool/RSRC.pm is in libimage-exiftool-perl 8.60-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 | #------------------------------------------------------------------------------
# File: RSRC.pm
#
# Description: Read Mac OS Resource information
#
# Revisions: 2010/03/17 - P. Harvey Created
#
# References: 1) http://developer.apple.com/legacy/mac/library/documentation/mac/MoreToolbox/MoreToolbox-99.html
#------------------------------------------------------------------------------
package Image::ExifTool::RSRC;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.02';
# Information decoded from Mac OS resources
%Image::ExifTool::RSRC::Main = (
GROUPS => { 2 => 'Document' },
NOTES => q{
Tags extracted from Mac OS resource files and DFONT files. These tags may
also be extracted from the resource fork of any file in OS X, either by
adding "/rsrc" to the filename to process the resource fork alone, or by
using the ExtractEmbedded (-ee) option to process the resource fork as a
sub-document of the main file.
},
'8BIM' => {
Name => 'PhotoshopInfo',
SubDirectory => { TagTable => 'Image::ExifTool::Photoshop::Main' },
},
'sfnt' => {
Name => 'Font',
SubDirectory => { TagTable => 'Image::ExifTool::Font::Name' },
},
'usro_0x0000' => 'OpenWithApplication',
'vers_0x0001' => 'ApplicationVersion',
'STR _0xbff3' => 'ApplicationMissingMsg',
'STR _0xbff4' => 'CreatorApplication',
# the following written by Photoshop
# (ref http://www.adobe.ca/devnet/photoshop/psir/ps_image_resources.pdf)
'STR#_0x0080' => 'Keywords',
'TEXT_0x0080' => 'Description',
# don't extract PICT's because the clip region isn't set properly
# in the PICT resource for some reason. Also, a dummy 512-byte
# header would have to be added to create a valid PICT file.
# 'PICT' => { Name => 'PreviewPICT', Binary => 1 },
);
#------------------------------------------------------------------------------
# Read information from a Mac resource file (ref 1)
# Inputs: 0) ExifTool ref, 1) dirInfo ref
# Returns: 1 on success, 0 if this wasn't a valid resource file
sub ProcessRSRC($$)
{
my ($exifTool, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my ($hdr, $map, $buff, $i, $j);
# attempt to validate the format as thoroughly as practical
return 0 unless $raf->Read($hdr, 30) == 30;
my ($datOff, $mapOff, $datLen, $mapLen) = unpack('N*', $hdr);
return 0 unless $raf->Seek(0, 2);
my $fLen = $raf->Tell();
return 0 if $datOff < 0x10 or $datOff + $datLen > $fLen;
return 0 if $mapOff < 0x10 or $mapOff + $mapLen > $fLen or $mapLen < 30;
return 0 if $datOff < $mapOff and $datOff + $datLen > $mapOff;
return 0 if $mapOff < $datOff and $mapOff + $mapLen > $datOff;
# read the resource map
$raf->Seek($mapOff, 0) and $raf->Read($map, $mapLen) == $mapLen or return 0;
SetByteOrder('MM');
my $typeOff = Get16u(\$map, 24);
my $nameOff = Get16u(\$map, 26);
my $numTypes = Get16u(\$map, 28);
# validate offsets in the resource map
return 0 if $typeOff < 28 or $nameOff < 30;
$exifTool->SetFileType('RSRC') unless $$exifTool{IN_RESOURCE};
my $verbose = $exifTool->Options('Verbose');
my $tagTablePtr = GetTagTable('Image::ExifTool::RSRC::Main');
# parse resource type list
for ($i=0; $i<=$numTypes; ++$i) {
my $off = $typeOff + 2 + 8 * $i; # offset of entry in type list
last if $off + 8 > $mapLen;
my $resType = substr($map,$off,4); # resource type
my $resNum = Get16u(\$map,$off+4); # number of resources - 1
my $refOff = Get16u(\$map,$off+6) + $typeOff; # offset to first resource reference
# loop through all resources
for ($j=0; $j<=$resNum; ++$j) {
my $roff = $refOff + 12 * $j;
last if $roff + 12 > $mapLen;
# read only the 24-bit resource data offset
my $id = Get16u(\$map,$roff);
my $resOff = (Get32u(\$map,$roff+4) & 0x00ffffff) + $datOff;
my $resNameOff = Get16u(\$map,$roff+2) + $nameOff + $mapOff;
my ($tag, $val, $valLen);
my $tagInfo = $$tagTablePtr{$resType};
if ($tagInfo) {
$tag = $resType;
} else {
$tag = sprintf('%s_0x%.4x', $resType, $id);
$tagInfo = $$tagTablePtr{$tag};
}
# read the resource data if necessary
if ($tagInfo or $verbose) {
unless ($raf->Seek($resOff, 0) and $raf->Read($buff, 4) == 4 and
($valLen = unpack('N', $buff)) < 1024000 and # arbitrary size limit
$raf->Read($val, $valLen) == $valLen)
{
$exifTool->Warn("Error reading $resType resource");
next;
}
}
if ($verbose) {
my ($resName, $nameLen);
$resName = '' unless $raf->Seek($resNameOff, 0) and $raf->Read($buff, 1) and
($nameLen = ord $buff) != 0 and $raf->Read($resName, $nameLen) == $nameLen;
$exifTool->VPrint(0,sprintf("$resType resource ID 0x%.4x (offset 0x%.4x, $valLen bytes, name='$resName'):\n", $id, $resOff));
$exifTool->VerboseDump(\$val);
}
next unless $tagInfo;
if ($resType eq 'vers') {
# parse the 'vers' resource to get the long version string
next unless $valLen > 8;
# long version string is after short version
my $p = 7 + Get8u(\$val, 6);
next if $p >= $valLen;
my $vlen = Get8u(\$val, $p++);
next if $p + $vlen > $valLen;
my $tagTablePtr = GetTagTable('Image::ExifTool::RSRC::Main');
$val = $exifTool->Decode(substr($val, $p, $vlen), 'MacRoman');
} elsif ($resType eq 'sfnt') {
# parse the OTF font block
$raf->Seek($resOff + 4, 0) or next;
$$dirInfo{Base} = $resOff + 4;
require Image::ExifTool::Font;
unless (Image::ExifTool::Font::ProcessOTF($exifTool, $dirInfo)) {
$exifTool->Warn('Unrecognized sfnt resource format');
}
$exifTool->OverrideFileType('DFONT');
next;
} elsif ($resType eq '8BIM') {
my $ttPtr = GetTagTable('Image::ExifTool::Photoshop::Main');
$exifTool->HandleTag($ttPtr, $id, $val,
DataPt => \$val,
DataPos => $resOff + 4,
Size => $valLen,
Start => 0,
Parent => 'RSRC',
);
next;
} elsif ($resType eq 'STR ' and $valLen > 1) {
# extract Pascal string
my $len = ord $val;
next unless $valLen >= $len + 1;
$val = substr($val, 1, $len);
} elsif ($resType eq 'usro' and $valLen > 4) {
my $len = unpack('N', $val);
next unless $valLen >= $len + 4;
($val = substr($val, 4, $len)) =~ s/\0.*//g; # truncate at null
} elsif ($resType eq 'STR#' and $valLen > 2) {
# extract list of strings (ref http://simtech.sourceforge.net/tech/strings.html)
my $num = unpack('n', $val);
next if $num & 0xf000; # (ignore special-format STR# resources)
my ($i, @vals);
my $pos = 2;
for ($i=0; $i<$num; ++$i) {
last if $pos >= $valLen;
my $len = ord substr($val, $pos++, 1);
last if $pos + $len > $valLen;
push @vals, substr($val, $pos, $len);
$pos += $len;
}
$val = \@vals;
} elsif ($resType ne 'TEXT') {
next;
}
$exifTool->HandleTag($tagTablePtr, $tag, $val);
}
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::RSRC - Read Mac OS Resource information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains routines required by Image::ExifTool to read Mac OS
resource files.
=head1 AUTHOR
Copyright 2003-2011, Phil Harvey (phil at owl.phy.queensu.ca)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 REFERENCES
=over 4
=item L<http://developer.apple.com/legacy/mac/library/documentation/mac/MoreToolbox/MoreToolbox-99.html>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/RSRC Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
|