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- #------------------------------------------------------------------------------
- # File: BigTIFF.pm
- #
- # Description: Read Big TIFF meta information
- #
- # Revisions: 07/03/2007 - P. Harvey Created
- #
- # References: 1) http://www.awaresystems.be/imaging/tiff/bigtiff.html
- #------------------------------------------------------------------------------
- package Image::ExifTool::BigTIFF;
- use strict;
- use vars qw($VERSION);
- use Image::ExifTool qw(:DataAccess :Utils);
- use Image::ExifTool::Exif;
- $VERSION = '1.06';
- my $maxOffset = 0x7fffffff; # currently supported maximum data offset/size
- #------------------------------------------------------------------------------
- # Process Big IFD directory
- # Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
- # Returns: 1 on success, otherwise returns 0 and sets a Warning
- sub ProcessBigIFD($$$)
- {
- my ($et, $dirInfo, $tagTablePtr) = @_;
- my $raf = $$dirInfo{RAF};
- my $verbose = $$et{OPTIONS}{Verbose};
- my $htmlDump = $$et{HTML_DUMP};
- my $dirName = $$dirInfo{DirName};
- my $dirStart = $$dirInfo{DirStart};
- $verbose = -1 if $htmlDump; # mix htmlDump into verbose so we can test for both at once
- # loop through IFD chain
- for (;;) {
- if ($dirStart > $maxOffset and not $et->Options('LargeFileSupport')) {
- $et->Warn('Huge offsets not supported (LargeFileSupport not set)');
- last;
- }
- unless ($raf->Seek($dirStart, 0)) {
- $et->Warn("Bad $dirName offset");
- return 0;
- }
- my ($dirBuff, $index);
- unless ($raf->Read($dirBuff, 8) == 8) {
- $et->Warn("Truncated $dirName count");
- return 0;
- }
- my $numEntries = Image::ExifTool::Get64u(\$dirBuff, 0);
- $verbose > 0 and $et->VerboseDir($dirName, $numEntries);
- my $bsize = $numEntries * 20;
- if ($bsize > $maxOffset) {
- $et->Warn('Huge directory counts not yet supported');
- last;
- }
- my $bufPos = $raf->Tell();
- unless ($raf->Read($dirBuff, $bsize) == $bsize) {
- $et->Warn("Truncated $dirName directory");
- return 0;
- }
- my $nextIFD;
- $raf->Read($nextIFD, 8) == 8 or undef $nextIFD; # try to read next IFD pointer
- if ($htmlDump) {
- $et->HDump($bufPos-8, 8, "$dirName entries", "Entry count: $numEntries");
- if (defined $nextIFD) {
- my $tip = sprintf("Offset: 0x%.8x", Image::ExifTool::Get64u(\$nextIFD, 0));
- $et->HDump($bufPos + 20 * $numEntries, 8, "Next IFD", $tip, 0);
- }
- }
- # loop through all entries in this BigTIFF IFD
- for ($index=0; $index<$numEntries; ++$index) {
- my $entry = 20 * $index;
- my $tagID = Get16u(\$dirBuff, $entry);
- my $format = Get16u(\$dirBuff, $entry+2);
- my $count = Image::ExifTool::Get64u(\$dirBuff, $entry+4);
- my $formatSize = $Image::ExifTool::Exif::formatSize[$format];
- unless (defined $formatSize) {
- $et->HDump($bufPos+$entry,20,"[invalid IFD entry]",
- "Bad format value: $format", 1);
- # warn unless the IFD was just padded with zeros
- $et->Warn(sprintf("Unknown format ($format) for $dirName tag 0x%x",$tagID));
- return 0; # assume corrupted IFD
- }
- my $formatStr = $Image::ExifTool::Exif::formatName[$format];
- my $size = $count * $formatSize;
- my $tagInfo = $et->GetTagInfo($tagTablePtr, $tagID);
- next unless defined $tagInfo or $verbose;
- my $valuePtr = $entry + 12;
- my ($valBuff, $valBase, $rational);
- if ($size > 8) {
- if ($size > $maxOffset) {
- $et->Warn("Can't handle $dirName entry $index (huge size)");
- next;
- }
- $valuePtr = Image::ExifTool::Get64u(\$dirBuff, $valuePtr);
- if ($valuePtr > $maxOffset and not $et->Options('LargeFileSupport')) {
- $et->Warn("Can't handle $dirName entry $index (LargeFileSupport not set)");
- next;
- }
- unless ($raf->Seek($valuePtr, 0) and $raf->Read($valBuff, $size) == $size) {
- $et->Warn("Error reading $dirName entry $index");
- next;
- }
- $valBase = 0;
- } else {
- $valBuff = substr($dirBuff, $valuePtr, $size);
- $valBase = $bufPos;
- }
- if (defined $tagInfo and not $tagInfo) {
- # GetTagInfo() required the value for a Condition
- $tagInfo = $et->GetTagInfo($tagTablePtr, $tagID, \$valBuff);
- }
- my $val = ReadValue(\$valBuff, 0, $formatStr, $count, $size, \$rational);
- if ($htmlDump) {
- my $tval = $val;
- # show numerator/denominator separately for rational numbers
- $tval .= " ($rational)" if defined $rational;
- my ($tagName, $colName);
- if ($tagID == 0x927c and $dirName eq 'ExifIFD') {
- $tagName = 'MakerNotes';
- } elsif ($tagInfo) {
- $tagName = $$tagInfo{Name};
- } else {
- $tagName = sprintf("Tag 0x%.4x",$tagID);
- }
- my $dname = sprintf("$dirName-%.2d", $index);
- # build our tool tip
- my $tip = sprintf("Tag ID: 0x%.4x\n", $tagID) .
- "Format: $formatStr\[$count]\nSize: $size bytes\n";
- if ($size > 8) {
- $tip .= sprintf("Value offset: 0x%.8x\n", $valuePtr);
- $colName = "<span class=H>$tagName</span>";
- } else {
- $colName = $tagName;
- }
- $tval = substr($tval,0,28) . '[...]' if length($tval) > 32;
- if ($formatStr =~ /^(string|undef|binary)/) {
- # translate non-printable characters
- $tval =~ tr/\x00-\x1f\x7f-\xff/./;
- } elsif ($tagInfo and Image::ExifTool::IsInt($tval)) {
- if ($$tagInfo{IsOffset}) {
- $tval = sprintf('0x%.4x', $tval);
- } elsif ($$tagInfo{PrintHex}) {
- $tval = sprintf('0x%x', $tval);
- }
- }
- $tip .= "Value: $tval";
- $et->HDump($entry+$bufPos, 20, "$dname $colName", $tip, 1);
- if ($size > 8) {
- # add value data block
- my $flg = ($tagInfo and $$tagInfo{SubDirectory} and $$tagInfo{MakerNotes}) ? 4 : 0;
- $et->HDump($valuePtr,$size,"$tagName value",'SAME', $flg);
- }
- }
- if ($tagInfo and $$tagInfo{SubIFD}) {
- # process all SubIFD's as BigTIFF
- $verbose > 0 and $et->VerboseInfo($tagID, $tagInfo,
- Table => $tagTablePtr,
- Index => $index,
- Value => $val,
- DataPt => \$valBuff,
- DataPos => $valBase + $valuePtr,
- Start => 0,
- Size => $size,
- Format => $formatStr,
- Count => $count,
- );
- my @offsets = split ' ', $val;
- my $i;
- for ($i=0; $i<scalar(@offsets); ++$i) {
- my $subdirName = $$tagInfo{Name};
- $subdirName .= $i if $i;
- my %subdirInfo = (
- RAF => $raf,
- DataPos => 0,
- DirStart => $offsets[$i],
- DirName => $subdirName,
- Parent => $dirInfo,
- );
- $et->ProcessDirectory(\%subdirInfo, $tagTablePtr, \&ProcessBigIFD);
- }
- } else {
- my $tagKey = $et->HandleTag($tagTablePtr, $tagID, $val,
- Index => $index,
- DataPt => \$valBuff,
- DataPos => $valBase + $valuePtr,
- Start => 0,
- Size => $size,
- Format => $formatStr,
- TagInfo => $tagInfo,
- RAF => $raf,
- );
- $tagKey and $et->SetGroup($tagKey, $dirName);
- }
- }
- last unless $dirName =~ /^(IFD|SubIFD)(\d*)$/;
- $dirName = $1 . (($2 || 0) + 1);
- defined $nextIFD or $et->Warn("Bad $dirName pointer"), return 0;
- $dirStart = Image::ExifTool::Get64u(\$nextIFD, 0);
- $dirStart or last;
- }
- return 1;
- }
- #------------------------------------------------------------------------------
- # Extract meta information from a BigTIFF image
- # Inputs: 0) ExifTool object reference, 1) dirInfo reference
- # Returns: 1 on success, 0 if this wasn't a valid BigTIFF image
- sub ProcessBTF($$)
- {
- my ($et, $dirInfo) = @_;
- my $raf = $$dirInfo{RAF};
- my $buff;
- return 0 unless $raf->Read($buff, 16) == 16;
- return 0 unless $buff =~ /^(MM\0\x2b\0\x08\0\0|II\x2b\0\x08\0\0\0)/;
- if ($$dirInfo{OutFile}) {
- $et->Error('ExifTool does not support writing of BigTIFF images');
- return 1;
- }
- $et->SetFileType('BTF'); # set the FileType tag
- SetByteOrder(substr($buff, 0, 2));
- my $offset = Image::ExifTool::Get64u(\$buff, 8);
- if ($$et{HTML_DUMP}) {
- my $o = (GetByteOrder() eq 'II') ? 'Little' : 'Big';
- $et->HDump(0, 8, "BigTIFF header", "Byte order: $o endian", 0);
- $et->HDump(8, 8, "IFD0 pointer", sprintf("Offset: 0x%.8x",$offset), 0);
- }
- my %dirInfo = (
- RAF => $raf,
- DataPos => 0,
- DirStart => $offset,
- DirName => 'IFD0',
- Parent => 'BigTIFF',
- );
- my $tagTablePtr = GetTagTable('Image::ExifTool::Exif::Main');
- $et->ProcessDirectory(\%dirInfo, $tagTablePtr, \&ProcessBigIFD);
- return 1;
- }
- 1; # end
- __END__
- =head1 NAME
- Image::ExifTool::BigTIFF - Read Big TIFF meta information
- =head1 SYNOPSIS
- This module is used by Image::ExifTool
- =head1 DESCRIPTION
- This module contains routines required by Image::ExifTool to read meta
- information in BigTIFF images.
- =head1 AUTHOR
- Copyright 2003-2016, 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://www.awaresystems.be/imaging/tiff/bigtiff.html>
- =back
- =head1 SEE ALSO
- L<Image::ExifTool::TagNames/EXIF Tags>,
- L<Image::ExifTool(3pm)|Image::ExifTool>
- =cut
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