242 lines
9.4 KiB
Perl
242 lines
9.4 KiB
Perl
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#------------------------------------------------------------------------------
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# File: RSRC.pm
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#
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# Description: Read Mac OS Resource information
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#
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# Revisions: 2010/03/17 - P. Harvey Created
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#
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# References: 1) http://developer.apple.com/legacy/mac/library/documentation/mac/MoreToolbox/MoreToolbox-99.html
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#------------------------------------------------------------------------------
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package Image::ExifTool::RSRC;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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$VERSION = '1.08';
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# Information decoded from Mac OS resources
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%Image::ExifTool::RSRC::Main = (
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GROUPS => { 2 => 'Document' },
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NOTES => q{
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Tags extracted from Mac OS resource files and DFONT files. These tags may
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also be extracted from the resource fork of any file in OS X, either by
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adding "/..namedfork/rsrc" to the filename to process the resource fork
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alone, or by using the ExtractEmbedded (-ee) option to process the resource
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fork as a sub-document of the main file. When writing, ExifTool preserves
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the Mac OS resource fork by default, but it may deleted with C<-rsrc:all=>
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on the command line.
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},
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'8BIM' => {
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Name => 'PhotoshopInfo',
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SubDirectory => { TagTable => 'Image::ExifTool::Photoshop::Main' },
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},
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'sfnt' => {
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Name => 'Font',
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SubDirectory => { TagTable => 'Image::ExifTool::Font::Name' },
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},
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# my samples of postscript-type DFONT files have a POST resource
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# with ID 0x1f5 and the same format as a PostScript file
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'POST_0x01f5' => {
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Name => 'PostscriptFont',
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SubDirectory => { TagTable => 'Image::ExifTool::PostScript::Main' },
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},
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'usro_0x0000' => 'OpenWithApplication',
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'vers_0x0001' => 'ApplicationVersion',
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'STR _0xbff3' => 'ApplicationMissingMsg',
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'STR _0xbff4' => 'CreatorApplication',
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# the following written by Photoshop
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# (ref http://www.adobe.ca/devnet/photoshop/psir/ps_image_resources.pdf)
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'STR#_0x0080' => 'Keywords',
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'TEXT_0x0080' => 'Description',
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# don't extract PICT's because the clip region isn't set properly
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# in the PICT resource for some reason. Also, a dummy 512-byte
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# header would have to be added to create a valid PICT file.
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# 'PICT' => { Name => 'PreviewPICT', Binary => 1 },
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);
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#------------------------------------------------------------------------------
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# Read information from a Mac resource file (ref 1)
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# Inputs: 0) ExifTool ref, 1) dirInfo ref
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# Returns: 1 on success, 0 if this wasn't a valid resource file
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sub ProcessRSRC($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my ($hdr, $map, $buff, $i, $j);
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# attempt to validate the format as thoroughly as practical
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return 0 unless $raf->Read($hdr, 30) == 30;
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my ($datOff, $mapOff, $datLen, $mapLen) = unpack('N*', $hdr);
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return 0 unless $raf->Seek(0, 2);
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my $fLen = $raf->Tell();
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return 0 if $datOff < 0x10 or $datOff + $datLen > $fLen;
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return 0 if $mapOff < 0x10 or $mapOff + $mapLen > $fLen or $mapLen < 30;
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return 0 if $datOff < $mapOff and $datOff + $datLen > $mapOff;
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return 0 if $mapOff < $datOff and $mapOff + $mapLen > $datOff;
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# read the resource map
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$raf->Seek($mapOff, 0) and $raf->Read($map, $mapLen) == $mapLen or return 0;
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SetByteOrder('MM');
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my $typeOff = Get16u(\$map, 24);
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my $nameOff = Get16u(\$map, 26);
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my $numTypes = Get16u(\$map, 28);
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# validate offsets in the resource map
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return 0 if $typeOff < 28 or $nameOff < 30;
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$et->SetFileType('RSRC') unless $$et{IN_RESOURCE};
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my $verbose = $et->Options('Verbose');
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my $tagTablePtr = GetTagTable('Image::ExifTool::RSRC::Main');
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$et->VerboseDir('RSRC', $numTypes+1);
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# parse resource type list
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for ($i=0; $i<=$numTypes; ++$i) {
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my $off = $typeOff + 2 + 8 * $i; # offset of entry in type list
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last if $off + 8 > $mapLen;
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my $resType = substr($map,$off,4); # resource type
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my $resNum = Get16u(\$map,$off+4); # number of resources - 1
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my $refOff = Get16u(\$map,$off+6) + $typeOff; # offset to first resource reference
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# loop through all resources
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for ($j=0; $j<=$resNum; ++$j) {
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my $roff = $refOff + 12 * $j;
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last if $roff + 12 > $mapLen;
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# read only the 24-bit resource data offset
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my $id = Get16u(\$map,$roff);
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my $resOff = (Get32u(\$map,$roff+4) & 0x00ffffff) + $datOff;
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my $resNameOff = Get16u(\$map,$roff+2) + $nameOff + $mapOff;
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my ($tag, $val, $valLen);
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my $tagInfo = $$tagTablePtr{$resType};
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if ($tagInfo) {
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$tag = $resType;
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} else {
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$tag = sprintf('%s_0x%.4x', $resType, $id);
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$tagInfo = $$tagTablePtr{$tag};
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}
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# read the resource data if necessary
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if ($tagInfo or $verbose) {
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unless ($raf->Seek($resOff, 0) and $raf->Read($buff, 4) == 4 and
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($valLen = unpack('N', $buff)) < 100000000 and # arbitrary size limit (100MB)
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$raf->Read($val, $valLen) == $valLen)
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{
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$et->Warn("Error reading $resType resource");
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next;
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}
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}
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if ($verbose) {
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my ($resName, $nameLen);
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$resName = '' unless $raf->Seek($resNameOff, 0) and $raf->Read($buff, 1) and
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($nameLen = ord $buff) != 0 and $raf->Read($resName, $nameLen) == $nameLen;
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$et->VPrint(0,sprintf("%s resource ID 0x%.4x (offset 0x%.4x, $valLen bytes, name='%s'):\n",
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$resType, $id, $resOff, $resName));
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$et->VerboseDump(\$val);
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}
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next unless $tagInfo;
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if ($resType eq 'vers') {
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# parse the 'vers' resource to get the long version string
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next unless $valLen > 8;
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# long version string is after short version
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my $p = 7 + Get8u(\$val, 6);
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next if $p >= $valLen;
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my $vlen = Get8u(\$val, $p++);
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next if $p + $vlen > $valLen;
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my $tagTablePtr = GetTagTable('Image::ExifTool::RSRC::Main');
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$val = $et->Decode(substr($val, $p, $vlen), 'MacRoman');
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} elsif ($resType eq 'sfnt') {
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# parse the OTF font block
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$raf->Seek($resOff + 4, 0) or next;
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$$dirInfo{Base} = $resOff + 4;
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require Image::ExifTool::Font;
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unless (Image::ExifTool::Font::ProcessOTF($et, $dirInfo)) {
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$et->Warn('Unrecognized sfnt resource format');
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}
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# assume this is a DFONT file unless processing the rsrc fork
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$et->OverrideFileType('DFONT') unless $$et{DOC_NUM};
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next;
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} elsif ($resType eq '8BIM') {
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my $ttPtr = GetTagTable('Image::ExifTool::Photoshop::Main');
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$et->HandleTag($ttPtr, $id, $val,
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DataPt => \$val,
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DataPos => $resOff + 4,
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Size => $valLen,
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Start => 0,
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Parent => 'RSRC',
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);
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next;
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} elsif ($resType eq 'STR ' and $valLen > 1) {
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# extract Pascal string
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my $len = ord $val;
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next unless $valLen >= $len + 1;
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$val = substr($val, 1, $len);
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} elsif ($resType eq 'usro' and $valLen > 4) {
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my $len = unpack('N', $val);
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next unless $valLen >= $len + 4;
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($val = substr($val, 4, $len)) =~ s/\0.*//g; # truncate at null
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} elsif ($resType eq 'STR#' and $valLen > 2) {
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# extract list of strings (ref http://simtech.sourceforge.net/tech/strings.html)
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my $num = unpack('n', $val);
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next if $num & 0xf000; # (ignore special-format STR# resources)
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my ($i, @vals);
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my $pos = 2;
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for ($i=0; $i<$num; ++$i) {
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last if $pos >= $valLen;
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my $len = ord substr($val, $pos++, 1);
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last if $pos + $len > $valLen;
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push @vals, substr($val, $pos, $len);
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$pos += $len;
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}
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$val = \@vals;
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} elsif ($resType eq 'POST') {
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# assume this is a DFONT file unless processing the rsrc fork
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$et->OverrideFileType('DFONT') unless $$et{DOC_NUM};
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$val = substr $val, 2;
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} elsif ($resType ne 'TEXT') {
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next;
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}
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$et->HandleTag($tagTablePtr, $tag, $val);
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}
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}
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::RSRC - Read Mac OS Resource information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains routines required by Image::ExifTool to read Mac OS
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resource files.
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=head1 AUTHOR
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Copyright 2003-2018, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://developer.apple.com/legacy/mac/library/documentation/mac/MoreToolbox/MoreToolbox-99.html>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/RSRC Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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