283 lines
11 KiB
Perl
283 lines
11 KiB
Perl
|
#------------------------------------------------------------------------------
|
||
|
|
# 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 2003-2018, 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
|
||
|
|
|