283 lines
11 KiB
Perl
283 lines
11 KiB
Perl
#------------------------------------------------------------------------------
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# File: BigTIFF.pm
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#
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# Description: Read Big TIFF meta information
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#
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# Revisions: 07/03/2007 - P. Harvey Created
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#
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# References: 1) http://www.awaresystems.be/imaging/tiff/bigtiff.html
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#------------------------------------------------------------------------------
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package Image::ExifTool::BigTIFF;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::Exif;
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$VERSION = '1.06';
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my $maxOffset = 0x7fffffff; # currently supported maximum data offset/size
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#------------------------------------------------------------------------------
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# Process Big IFD directory
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# Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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# Returns: 1 on success, otherwise returns 0 and sets a Warning
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sub ProcessBigIFD($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $raf = $$dirInfo{RAF};
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my $verbose = $$et{OPTIONS}{Verbose};
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my $htmlDump = $$et{HTML_DUMP};
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my $dirName = $$dirInfo{DirName};
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my $dirStart = $$dirInfo{DirStart};
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$verbose = -1 if $htmlDump; # mix htmlDump into verbose so we can test for both at once
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# loop through IFD chain
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for (;;) {
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if ($dirStart > $maxOffset and not $et->Options('LargeFileSupport')) {
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$et->Warn('Huge offsets not supported (LargeFileSupport not set)');
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last;
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}
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unless ($raf->Seek($dirStart, 0)) {
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$et->Warn("Bad $dirName offset");
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return 0;
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}
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my ($dirBuff, $index);
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unless ($raf->Read($dirBuff, 8) == 8) {
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$et->Warn("Truncated $dirName count");
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return 0;
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}
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my $numEntries = Image::ExifTool::Get64u(\$dirBuff, 0);
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$verbose > 0 and $et->VerboseDir($dirName, $numEntries);
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my $bsize = $numEntries * 20;
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if ($bsize > $maxOffset) {
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$et->Warn('Huge directory counts not yet supported');
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last;
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}
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my $bufPos = $raf->Tell();
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unless ($raf->Read($dirBuff, $bsize) == $bsize) {
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$et->Warn("Truncated $dirName directory");
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return 0;
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}
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my $nextIFD;
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$raf->Read($nextIFD, 8) == 8 or undef $nextIFD; # try to read next IFD pointer
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if ($htmlDump) {
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$et->HDump($bufPos-8, 8, "$dirName entries", "Entry count: $numEntries");
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if (defined $nextIFD) {
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my $tip = sprintf("Offset: 0x%.8x", Image::ExifTool::Get64u(\$nextIFD, 0));
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$et->HDump($bufPos + 20 * $numEntries, 8, "Next IFD", $tip, 0);
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}
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}
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# loop through all entries in this BigTIFF IFD
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for ($index=0; $index<$numEntries; ++$index) {
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my $entry = 20 * $index;
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my $tagID = Get16u(\$dirBuff, $entry);
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my $format = Get16u(\$dirBuff, $entry+2);
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my $count = Image::ExifTool::Get64u(\$dirBuff, $entry+4);
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my $formatSize = $Image::ExifTool::Exif::formatSize[$format];
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unless (defined $formatSize) {
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$et->HDump($bufPos+$entry,20,"[invalid IFD entry]",
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"Bad format value: $format", 1);
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# warn unless the IFD was just padded with zeros
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$et->Warn(sprintf("Unknown format ($format) for $dirName tag 0x%x",$tagID));
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return 0; # assume corrupted IFD
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}
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my $formatStr = $Image::ExifTool::Exif::formatName[$format];
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my $size = $count * $formatSize;
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $tagID);
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next unless defined $tagInfo or $verbose;
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my $valuePtr = $entry + 12;
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my ($valBuff, $valBase, $rational);
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if ($size > 8) {
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if ($size > $maxOffset) {
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$et->Warn("Can't handle $dirName entry $index (huge size)");
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next;
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}
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$valuePtr = Image::ExifTool::Get64u(\$dirBuff, $valuePtr);
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if ($valuePtr > $maxOffset and not $et->Options('LargeFileSupport')) {
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$et->Warn("Can't handle $dirName entry $index (LargeFileSupport not set)");
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next;
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}
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unless ($raf->Seek($valuePtr, 0) and $raf->Read($valBuff, $size) == $size) {
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$et->Warn("Error reading $dirName entry $index");
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next;
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}
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$valBase = 0;
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} else {
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$valBuff = substr($dirBuff, $valuePtr, $size);
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$valBase = $bufPos;
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}
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if (defined $tagInfo and not $tagInfo) {
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# GetTagInfo() required the value for a Condition
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$tagInfo = $et->GetTagInfo($tagTablePtr, $tagID, \$valBuff);
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}
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my $val = ReadValue(\$valBuff, 0, $formatStr, $count, $size, \$rational);
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if ($htmlDump) {
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my $tval = $val;
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# show numerator/denominator separately for rational numbers
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$tval .= " ($rational)" if defined $rational;
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my ($tagName, $colName);
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if ($tagID == 0x927c and $dirName eq 'ExifIFD') {
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$tagName = 'MakerNotes';
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} elsif ($tagInfo) {
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$tagName = $$tagInfo{Name};
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} else {
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$tagName = sprintf("Tag 0x%.4x",$tagID);
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}
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my $dname = sprintf("$dirName-%.2d", $index);
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# build our tool tip
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my $tip = sprintf("Tag ID: 0x%.4x\n", $tagID) .
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"Format: $formatStr\[$count]\nSize: $size bytes\n";
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if ($size > 8) {
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$tip .= sprintf("Value offset: 0x%.8x\n", $valuePtr);
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$colName = "<span class=H>$tagName</span>";
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} else {
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$colName = $tagName;
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}
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$tval = substr($tval,0,28) . '[...]' if length($tval) > 32;
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if ($formatStr =~ /^(string|undef|binary)/) {
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# translate non-printable characters
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$tval =~ tr/\x00-\x1f\x7f-\xff/./;
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} elsif ($tagInfo and Image::ExifTool::IsInt($tval)) {
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if ($$tagInfo{IsOffset}) {
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$tval = sprintf('0x%.4x', $tval);
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} elsif ($$tagInfo{PrintHex}) {
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$tval = sprintf('0x%x', $tval);
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}
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}
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$tip .= "Value: $tval";
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$et->HDump($entry+$bufPos, 20, "$dname $colName", $tip, 1);
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if ($size > 8) {
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# add value data block
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my $flg = ($tagInfo and $$tagInfo{SubDirectory} and $$tagInfo{MakerNotes}) ? 4 : 0;
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$et->HDump($valuePtr,$size,"$tagName value",'SAME', $flg);
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}
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}
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if ($tagInfo and $$tagInfo{SubIFD}) {
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# process all SubIFD's as BigTIFF
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$verbose > 0 and $et->VerboseInfo($tagID, $tagInfo,
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Table => $tagTablePtr,
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Index => $index,
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Value => $val,
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DataPt => \$valBuff,
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DataPos => $valBase + $valuePtr,
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Start => 0,
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Size => $size,
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Format => $formatStr,
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Count => $count,
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);
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my @offsets = split ' ', $val;
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my $i;
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for ($i=0; $i<scalar(@offsets); ++$i) {
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my $subdirName = $$tagInfo{Name};
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$subdirName .= $i if $i;
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my %subdirInfo = (
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RAF => $raf,
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DataPos => 0,
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DirStart => $offsets[$i],
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DirName => $subdirName,
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Parent => $dirInfo,
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);
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$et->ProcessDirectory(\%subdirInfo, $tagTablePtr, \&ProcessBigIFD);
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}
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} else {
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my $tagKey = $et->HandleTag($tagTablePtr, $tagID, $val,
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Index => $index,
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DataPt => \$valBuff,
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DataPos => $valBase + $valuePtr,
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Start => 0,
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Size => $size,
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Format => $formatStr,
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TagInfo => $tagInfo,
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RAF => $raf,
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);
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$tagKey and $et->SetGroup($tagKey, $dirName);
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}
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}
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last unless $dirName =~ /^(IFD|SubIFD)(\d*)$/;
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$dirName = $1 . (($2 || 0) + 1);
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defined $nextIFD or $et->Warn("Bad $dirName pointer"), return 0;
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$dirStart = Image::ExifTool::Get64u(\$nextIFD, 0);
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$dirStart or last;
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}
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return 1;
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}
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#------------------------------------------------------------------------------
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# Extract meta information from a BigTIFF image
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid BigTIFF image
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sub ProcessBTF($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my $buff;
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return 0 unless $raf->Read($buff, 16) == 16;
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return 0 unless $buff =~ /^(MM\0\x2b\0\x08\0\0|II\x2b\0\x08\0\0\0)/;
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if ($$dirInfo{OutFile}) {
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$et->Error('ExifTool does not support writing of BigTIFF images');
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return 1;
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}
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$et->SetFileType('BTF'); # set the FileType tag
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SetByteOrder(substr($buff, 0, 2));
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my $offset = Image::ExifTool::Get64u(\$buff, 8);
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if ($$et{HTML_DUMP}) {
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my $o = (GetByteOrder() eq 'II') ? 'Little' : 'Big';
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$et->HDump(0, 8, "BigTIFF header", "Byte order: $o endian", 0);
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$et->HDump(8, 8, "IFD0 pointer", sprintf("Offset: 0x%.8x",$offset), 0);
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}
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my %dirInfo = (
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RAF => $raf,
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DataPos => 0,
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DirStart => $offset,
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DirName => 'IFD0',
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Parent => 'BigTIFF',
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);
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my $tagTablePtr = GetTagTable('Image::ExifTool::Exif::Main');
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$et->ProcessDirectory(\%dirInfo, $tagTablePtr, \&ProcessBigIFD);
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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::BigTIFF - Read Big TIFF meta 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 meta
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information in BigTIFF images.
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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://www.awaresystems.be/imaging/tiff/bigtiff.html>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/EXIF Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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