#------------------------------------------------------------------------------
# File: Validate.pm
#
# Description: Additional metadata validation
#
# Revisions: 2017/01/18 - P. Harvey Created
#------------------------------------------------------------------------------
package Image::ExifTool::Validate;
use strict;
use vars qw($VERSION %exifSpec);
$VERSION = '1.02';
use Image::ExifTool qw(:Utils);
use Image::ExifTool::Exif;
# EXIF table tag ID's which are part of the EXIF 2.31 specification
# (also used by BuildTagLookup to add underlines in HTML version of EXIF Tag Table)
%exifSpec = (
0x100 => 1, 0x8298 => 1, 0x9207 => 1, 0xa217 => 1,
0x101 => 1, 0x829a => 1, 0x9208 => 1, 0xa300 => 1,
0x102 => 1, 0x829d => 1, 0x9209 => 1, 0xa301 => 1,
0x103 => 1, 0x8769 => 1, 0x920a => 1, 0xa302 => 1,
0x106 => 1, 0x8822 => 1, 0x9214 => 1, 0xa401 => 1,
0x10e => 1, 0x8824 => 1, 0x927c => 1, 0xa402 => 1,
0x10f => 1, 0x8825 => 1, 0x9286 => 1, 0xa403 => 1,
0x110 => 1, 0x8827 => 1, 0x9290 => 1, 0xa404 => 1,
0x111 => 1, 0x8828 => 1, 0x9291 => 1, 0xa405 => 1,
0x112 => 1, 0x8830 => 1, 0x9292 => 1, 0xa406 => 1,
0x115 => 1, 0x8831 => 1, 0x9400 => 1, 0xa407 => 1,
0x116 => 1, 0x8832 => 1, 0x9401 => 1, 0xa408 => 1,
0x117 => 1, 0x8833 => 1, 0x9402 => 1, 0xa409 => 1,
0x11a => 1, 0x8834 => 1, 0x9403 => 1, 0xa40a => 1,
0x11b => 1, 0x8835 => 1, 0x9404 => 1, 0xa40b => 1,
0x11c => 1, 0x9000 => 1, 0x9405 => 1, 0xa40c => 1,
0x128 => 1, 0x9003 => 1, 0xa000 => 1, 0xa420 => 1,
0x12d => 1, 0x9004 => 1, 0xa001 => 1, 0xa430 => 1,
0x131 => 1, 0x9010 => 1, 0xa002 => 1, 0xa431 => 1,
0x132 => 1, 0x9011 => 1, 0xa003 => 1, 0xa432 => 1,
0x13b => 1, 0x9012 => 1, 0xa004 => 1, 0xa433 => 1,
0x13e => 1, 0x9101 => 1, 0xa005 => 1, 0xa434 => 1,
0x13f => 1, 0x9102 => 1, 0xa20b => 1, 0xa435 => 1,
0x201 => 1, 0x9201 => 1, 0xa20c => 1,
0x202 => 1, 0x9202 => 1, 0xa20e => 1,
0x211 => 1, 0x9203 => 1, 0xa20f => 1,
0x212 => 1, 0x9204 => 1, 0xa210 => 1,
0x213 => 1, 0x9205 => 1, 0xa214 => 1,
0x214 => 1, 0x9206 => 1, 0xa215 => 1,
);
# standard format for tags (not necessary for exifSpec tags where Writable is defined)
my %stdFormat = (
ExifIFD => {
0xa002 => 'int(16|32)u',
0xa003 => 'int(16|32)u',
},
InteropIFD => {
0x01 => 'string',
0x02 => 'undef',
0x1000 => 'string',
0x1001 => 'int(16|32)u',
0x1002 => 'int(16|32)u',
},
GPS => {
All => '', # all defined GPS tags are standard
},
IFD => {
# TIFF, EXIF, XMP, IPTC, ICC_Profile and PrintIM standard tags:
0xfe => 'int32u', 0x11f => 'rational64u', 0x14a => 'int32u', 0x205 => 'int16u',
0xff => 'int16u', 0x120 => 'int32u', 0x14c => 'int16u', 0x206 => 'int16u',
0x100 => 'int(16|32)u', 0x121 => 'int32u', 0x14d => 'string', 0x207 => 'int32u',
0x101 => 'int(16|32)u', 0x122 => 'int16u', 0x14e => 'int16u', 0x208 => 'int32u',
0x107 => 'int16u', 0x123 => 'int16u', 0x150 => 'int(8|16)u', 0x209 => 'int32u',
0x108 => 'int16u', 0x124 => 'int32u', 0x151 => 'string', 0x211 => 'rational64u',
0x109 => 'int16u', 0x125 => 'int32u', 0x152 => 'int16u', 0x212 => 'int16u',
0x10a => 'int16u', 0x129 => 'int16u', 0x153 => 'int16u', 0x213 => 'int16u',
0x10d => 'string', 0x13c => 'string', 0x154 => '.*', 0x214 => 'rational64u',
0x111 => 'int(16|32)u', 0x13d => 'int16u', 0x155 => '.*', 0x2bc => 'int8u',
0x116 => 'int(16|32)u', 0x140 => 'int16u', 0x156 => 'int16u', 0x828d => 'int16u',
0x117 => 'int(16|32)u', 0x141 => 'int16u', 0x15b => 'undef', 0x828e => 'int8u',
0x118 => 'int16u', 0x142 => 'int(16|32)u', 0x200 => 'int16u', 0x83bb => 'int32u',
0x119 => 'int16u', 0x143 => 'int(16|32)u', 0x201 => 'int32u', 0x8773 => 'undef',
0x11d => 'string', 0x144 => 'int32u', 0x202 => 'int32u', 0xc4a5 => 'undef',
0x11e => 'rational64u', 0x145 => 'int(16|32)u', 0x203 => 'int16u',
# Windows Explorer tags:
0x9c9b => 'int8u', 0x9c9d => 'int8u', 0x9c9f => 'int8u',
0x9c9c => 'int8u', 0x9c9e => 'int8u',
# DNG tags:
0xc615 => '(string|int8u)', 0xc6d3 => '',
0xc61a => '(int16u|int32u|rational64u)', 0xc6f4 => '(string|int8u)',
0xc61d => 'int(16|32)u', 0xc6f6 => '(string|int8u)',
0xc61f => '(int16u|int32u|rational64u)', 0xc6f8 => '(string|int8u)',
0xc620 => '(int16u|int32u|rational64u)', 0xc6fe => '(string|int8u)',
0xc628 => '(int16u|rational64u)', 0xc716 => '(string|int8u)',
0xc634 => 'int8u', 0xc717 => '(string|int8u)',
0xc640 => '', 0xc718 => '(string|int8u)',
0xc660 => '', 0xc71e => 'int(16|32)u',
0xc68b => '(string|int8u)', 0xc71f => 'int(16|32)u',
0xc68d => 'int(16|32)u', 0xc791 => 'int(16|32)u',
0xc68e => 'int(16|32)u', 0xc792 => 'int(16|32)u',
0xc6d2 => '', 0xc793 => '(int16u|int32u|rational64u)',
},
);
# "Validate" tag information
my %validateInfo = (
Groups => { 0 => 'ExifTool', 1 => 'ExifTool', 2 => 'ExifTool' },
Notes => q{
[experimental] generated only if specifically requested. Requesting this
tag automatically enables the L<API Validate option|../ExifTool.html#Validate>,
imposing additional validation checks when extracting metadata. Returns the
number of errors, warnings and minor warnings encountered
},
PrintConv => {
'0 0 0' => 'OK',
OTHER => sub {
my @val = split ' ', shift;
my @rtn;
push @rtn, sprintf('%d Error%s', $val[0], $val[0] == 1 ? '' : 's') if $val[0];
push @rtn, sprintf('%d Warning%s', $val[1], $val[1] == 1 ? '' : 's') if $val[1];
$rtn[-1] .= sprintf(' (%s minor)', $val[1] == $val[2] ? 'all' : $val[2]) if $val[2];
return join(' and ', @rtn);
},
},
);
# generate lookup for any IFD
my %stdFormatAnyIFD = map { %{$stdFormat{$_}} } keys %stdFormat;
# add "Validate" tag to Extra table
AddTagToTable(\%Image::ExifTool::Extra, Validate => \%validateInfo, 1);
#------------------------------------------------------------------------------
# Validate EXIF tag
# Inputs: 0) ExifTool ref, 1) tag table ref, 2) tag ID, 3) tagInfo ref,
# 4) previous tag ID, 5) IFD name, 6) number of values, 7) value format string
# Returns: Nothing, but sets Warning tags if any problems are found
sub ValidateExif($$$$$$$$)
{
my ($et, $tagTablePtr, $tag, $tagInfo, $lastTag, $ifd, $count, $formatStr) = @_;
$et->WarnOnce("Entries in $ifd are out of order") if $tag <= $lastTag;
if (defined $tagInfo) {
my $ti = $tagInfo || $$tagTablePtr{$tag};
$ti = $$ti[-1] if ref $ti eq 'ARRAY';
my $stdFmt = $stdFormat{$ifd} || $stdFormat{IFD};
if (defined $$stdFmt{All} or ($tagTablePtr eq \%Image::ExifTool::Exif::Main and
($exifSpec{$tag} or $$stdFmt{$tag} or
($tag >= 0xc612 and $tag <= 0xc7b5 and not defined $$stdFmt{$tag})))) # (DNG tags)
{
my $wgp = $$ti{WriteGroup} || $$tagTablePtr{WRITE_GROUP};
if ($wgp and $wgp ne $ifd and $wgp ne 'All' and not $$ti{OffsetPair} and
($ifd =~ /^(Sub|Profile)?IFD\d*$/ xor $wgp =~ /^(Sub)?IFD\d*$/))
{
$et->Warn(sprintf('Wrong IFD for 0x%.4x %s (should be %s not %s)', $tag, $$ti{Name}, $wgp, $ifd));
}
my $fmt = $$stdFmt{$tag} || $$ti{Writable};
if ($fmt and $formatStr !~ /^$fmt$/) {
$et->Warn(sprintf('Non-standard format (%s) for %s 0x%.4x %s', $formatStr, $ifd, $tag, $$ti{Name}))
}
} elsif ($stdFormatAnyIFD{$tag}) {
my $wgp = $$ti{WriteGroup} || $$tagTablePtr{WRITE_GROUP};
if ($wgp) {
$et->Warn(sprintf('Wrong IFD for 0x%.4x %s (should be %s not %s)', $tag, $$ti{Name}, $wgp, $ifd));
} else {
$et->Warn(sprintf('Wrong IFD for 0x%.4x %s (found in %s)', $tag, $$ti{Name}, $ifd));
}
} else {
$et->Warn(sprintf('Non-standard %s tag 0x%.4x %s', $ifd, $tag, $$ti{Name}), 1);
}
if ($$ti{Count} and $$ti{Count} > 0 and $count != $$ti{Count}) {
$et->Warn(sprintf('Non-standard count (%d) for %s tag 0x%.4x %s', $count, $ifd, $tag, $$ti{Name}));
}
} else {
$et->Warn(sprintf('Unknown %s tag 0x%.4x', $ifd, $tag), 1);
}
}
#------------------------------------------------------------------------------
# Generate Validate tag
# Inputs: 0) ExifTool ref
sub MakeValidateTag($)
{
my $et = shift;
my (@num, $key);
push @num, $$et{VALUE}{Error} ? ($$et{DUPL_TAG}{Error} || 0) + 1 : 0,
$$et{VALUE}{Warning} ? ($$et{DUPL_TAG}{Warning} || 0) + 1 : 0, 0;
for ($key = 'Warning'; ; ) {
++$num[2] if $$et{VALUE}{$key} and $$et{VALUE}{$key} =~ /^\[minor\]/i;
$key = $et->NextTagKey($key) or last;
}
$et->FoundTag(Validate => "@num");
}
# validation code for each image type
# FileType->Group1->Validation code
# - validation code may access $val and %val, and returns 1 on success,
# or error message otherwise ('' for a generic message)
my %validate = (
TIFF => {
IFD0 => {
0x103 => q{
not defined $val or $val =~ /^(1|6|32773)$/ or
($val == 2 and (not defined $val{0x102} or $val{0x102} == 1));
}, # Compression
0x106 => '$val =~ /^[0123]$/', # PhotometricInterpretation
0x100 => 'defined $val', # ImageWidth
0x101 => 'defined $val', # ImageLength
0x111 => 'defined $val', # StripOffsets
0x117 => 'defined $val', # StripByteCounts
0x11a => 'defined $val', # XResolution
0x11b => 'defined $val', # YResolution
0x128 => 'not defined $val or $val =~ /^[123]$/', # ResolutionUnit
# ColorMap (must be palette image with correct number of colors)
0x140 => q{
return '' if defined $val{0x106} and $val{0x106} == 3 xor defined $val;
return 1 if not defined $val or scalar(split ' ', $val) == 3 * 2 ** ($val{0x102} || 0);
return 'Invalid count for';
},
# SamplesPerPixel
0x115 => q{
my $pi = $val{0x106} || 0;
my $xtra = ($val{0x152} ? scalar(split ' ', $val{0x152}) : 0);
if ($pi == 2 or $pi == 6) {
return $val == 3 + $xtra;
} elsif ($pi == 5) {
return $val == 4 + $xtra;
} else {
return 1;
}
},
},
},
);
#------------------------------------------------------------------------------
# Finish Validating tags
# Inputs: 0) ExifTool ref, 1) True to generate Validate tag
sub FinishValidate($$)
{
my ($et, $mkTag) = @_;
my $fileType = $$et{FILE_TYPE};
$fileType = $$et{TIFF_TYPE} if $fileType eq 'TIFF';
if ($validate{$fileType}) {
my ($grp, $tag, %val);
local $SIG{'__WARN__'} = \&Image::ExifTool::SetWarning;
foreach $grp (sort keys %{$validate{$fileType}}) {
# get all tags in this group
my ($key, %val, %info);
foreach $key (keys %{$$et{VALUE}}) {
next unless $et->GetGroup($key, 1) eq $grp;
# fill in %val lookup with values based on tag ID
my $tag = $$et{TAG_INFO}{$key}{TagID};
$val{$tag} = $$et{VALUE}{$key};
# save TagInfo ref for later
$info{$tag} = $$et{TAG_INFO}{$key};
}
# make quick lookup for values based on tag ID
my $validateTags = $validate{$fileType}{$grp};
foreach $tag (sort { $a <=> $b } keys %$validateTags) {
my $val = $val{$tag};
#### eval ($val, %val)
my $result = eval $$validateTags{$tag};
if (not defined $result) {
$result = 'Internal error validating';
} elsif ($result eq '') {
$result = defined $val ? 'Invalid value for' : 'Missing required';
} elsif ($result eq '1') {
next;
}
my $name;
if ($info{$tag}) {
$name = $info{$tag}{Name};
} else {
my $tagInfo = $Image::ExifTool::Exif::Main{$tag};
$tagInfo = $$tagInfo[0] if ref $tagInfo eq 'ARRAY';
$name = $tagInfo ? $$tagInfo{Name} : '<unknown>';
}
$et->Warn(sprintf('%s %s tag 0x%.4x %s', $result, $grp, $tag, $name));
}
}
}
MakeValidateTag($et) if $mkTag;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::Validate - Additional metadata validation
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains additional routines and definitions used when the
ExifTool Validate option is enabled.
=head1 AUTHOR
Copyright 2003-2017, 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 SEE ALSO
L<Image::ExifTool(3pm)|Image::ExifTool>,
L<Image::ExifTool::TagNames/Extra Tags>
=cut