323 lines
10 KiB
Perl
323 lines
10 KiB
Perl
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#------------------------------------------------------------------------------
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# File: APP12.pm
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#
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# Description: Read APP12 meta information
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#
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# Revisions: 10/18/2005 - P. Harvey Created
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#
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# References: 1) Heinrich Giesen private communication
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#------------------------------------------------------------------------------
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package Image::ExifTool::APP12;
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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 = '1.13';
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sub ProcessAPP12($$$);
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sub ProcessDucky($$$);
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sub WriteDucky($$$);
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# APP12 tags (ref PH)
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%Image::ExifTool::APP12::PictureInfo = (
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PROCESS_PROC => \&ProcessAPP12,
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GROUPS => { 0 => 'APP12', 1 => 'PictureInfo', 2 => 'Image' },
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PRIORITY => 0,
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NOTES => q{
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The JPEG APP12 "Picture Info" segment was used by some older cameras, and
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contains ASCII-based meta information. Below are some tags which have been
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observed Agfa and Polaroid images, however ExifTool will extract information
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from any tags found in this segment.
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},
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FNumber => {
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ValueConv => '$val=~s/^[A-Za-z ]*//;$val', # Agfa leads with an 'F'
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PrintConv => 'sprintf("%.1f",$val)',
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},
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Aperture => {
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PrintConv => 'sprintf("%.1f",$val)',
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},
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TimeDate => {
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Name => 'DateTimeOriginal',
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Description => 'Date/Time Original',
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Groups => { 2 => 'Time' },
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ValueConv => '$val=~/^\d+$/ ? ConvertUnixTime($val) : $val',
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PrintConv => '$self->ConvertDateTime($val)',
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},
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Shutter => {
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Name => 'ExposureTime',
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ValueConv => '$val * 1e-6',
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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shtr => {
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Name => 'ExposureTime',
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ValueConv => '$val * 1e-6',
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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'Serial#' => {
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Name => 'SerialNumber',
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Groups => { 2 => 'Camera' },
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},
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Flash => { PrintConv => { 0 => 'Off', 1 => 'On' } },
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Macro => { PrintConv => { 0 => 'Off', 1 => 'On' } },
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StrobeTime => { },
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Ytarget => { Name => 'YTarget' },
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ylevel => { Name => 'YLevel' },
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FocusPos => { },
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FocusMode => { },
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Quality => { },
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ExpBias => 'ExposureCompensation',
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FWare => 'FirmwareVersion',
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StrobeTime => { },
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Resolution => { },
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Protect => { },
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ConTake => { },
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ImageSize => { PrintConv => '$val=~tr/-/x/;$val' },
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ColorMode => { },
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Zoom => { },
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ZoomPos => { },
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LightS => { },
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Type => {
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Name => 'CameraType',
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Groups => { 2 => 'Camera' },
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DataMember => 'CameraType',
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RawConv => '$self->{CameraType} = $val',
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},
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Version => { Groups => { 2 => 'Camera' } },
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ID => { Groups => { 2 => 'Camera' } },
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);
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# APP12 segment written in Photoshop "Save For Web" images
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# (from tests with Photoshop 7 files - PH/1)
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%Image::ExifTool::APP12::Ducky = (
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PROCESS_PROC => \&ProcessDucky,
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WRITE_PROC => \&WriteDucky,
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GROUPS => { 0 => 'Ducky', 1 => 'Ducky', 2 => 'Image' },
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WRITABLE => 'string',
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NOTES => q{
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Photoshop uses the JPEG APP12 "Ducky" segment to store some information in
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"Save for Web" images.
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},
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1 => { #PH
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Name => 'Quality',
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Priority => 0,
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Avoid => 1,
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Writable => 'int32u',
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ValueConv => 'unpack("N",$val)', # 4-byte integer
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ValueConvInv => 'pack("N",$val)',
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PrintConv => '"$val%"',
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PrintConvInv => '$val=~/(\d+)/ ? $1 : undef',
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},
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2 => { #1
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Name => 'Comment',
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Priority => 0,
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Avoid => 1,
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# (ignore 4-byte character count at start of value)
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ValueConv => '$self->Decode(substr($val,4),"UCS2","MM")',
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ValueConvInv => 'pack("N",length $val) . $self->Encode($val,"UCS2","MM")',
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},
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3 => { #PH
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Name => 'Copyright',
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Priority => 0,
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Avoid => 1,
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Groups => { 2 => 'Author' },
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# (ignore 4-byte character count at start of value)
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ValueConv => '$self->Decode(substr($val,4),"UCS2","MM")',
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ValueConvInv => 'pack("N",length $val) . $self->Encode($val,"UCS2","MM")',
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},
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);
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#------------------------------------------------------------------------------
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# Write APP12 Ducky segment
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# Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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# Returns: New directory data or undefined on error
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sub WriteDucky($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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$et or return 1; # allow dummy access to autoload this package
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my $dataPt = $$dirInfo{DataPt};
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my $pos = $$dirInfo{DirStart};
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my $newTags = $et->GetNewTagInfoHash($tagTablePtr);
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my @addTags = sort { $a <=> $b } keys(%$newTags);
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my ($dirEnd, %doneTags);
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if ($dataPt) {
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$dirEnd = $pos + $$dirInfo{DirLen};
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} else {
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my $tmp = '';
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$dataPt = \$tmp;
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$pos = $dirEnd = 0;
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}
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my $newData = '';
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SetByteOrder('MM');
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# process all data blocks in Ducky segment
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for (;;) {
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my ($tag, $len, $val);
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if ($pos + 4 <= $dirEnd) {
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$tag = Get16u($dataPt, $pos);
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$len = Get16u($dataPt, $pos + 2);
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$pos += 4;
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if ($pos + $len > $dirEnd) {
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$et->Warn('Invalid Ducky block length');
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return undef;
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}
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$val = substr($$dataPt, $pos, $len);
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$pos += $len;
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} else {
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last unless @addTags;
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$tag = pop @addTags;
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next if $doneTags{$tag};
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}
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$doneTags{$tag} = 1;
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my $tagInfo = $$newTags{$tag};
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if ($tagInfo) {
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my $nvHash = $et->GetNewValueHash($tagInfo);
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my $isNew;
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if (defined $val) {
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if ($et->IsOverwriting($nvHash, $val)) {
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$et->VerboseValue("- Ducky:$$tagInfo{Name}", $val);
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$isNew = 1;
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}
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} else {
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next unless $$nvHash{IsCreating};
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$isNew = 1;
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}
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if ($isNew) {
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$val = $et->GetNewValue($nvHash);
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++$$et{CHANGED};
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next unless defined $val; # next if tag is being deleted
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$et->VerboseValue("+ Ducky:$$tagInfo{Name}", $val);
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}
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}
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$newData .= pack('nn', $tag, length $val) . $val;
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}
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$newData .= "\0\0" if length $newData;
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return $newData;
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}
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#------------------------------------------------------------------------------
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# Process APP12 Ducky segment (ref PH)
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# Inputs: 0) ExifTool object reference, 1) Directory information ref, 2) tag table ref
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# Returns: 1 on success, 0 if this wasn't a recognized Ducky segment
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# Notes: This segment has the following format:
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# 1) 5 bytes: "Ducky"
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# 2) multiple data blocks (all integers are big endian):
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# a) 2 bytes: block type (0=end, 1=Quality, 2=Comment, 3=Copyright)
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# b) 2 bytes: block length (N)
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# c) N bytes: block data
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sub ProcessDucky($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $pos = $$dirInfo{DirStart};
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my $dirEnd = $pos + $$dirInfo{DirLen};
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SetByteOrder('MM');
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# process all data blocks in Ducky segment
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for (;;) {
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last if $pos + 4 > $dirEnd;
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my $tag = Get16u($dataPt, $pos);
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my $len = Get16u($dataPt, $pos + 2);
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$pos += 4;
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if ($pos + $len > $dirEnd) {
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$et->Warn('Invalid Ducky block length');
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last;
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}
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my $val = substr($$dataPt, $pos, $len);
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$et->HandleTag($tagTablePtr, $tag, $val,
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DataPt => $dataPt,
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DataPos => $$dirInfo{DataPos},
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Start => $pos,
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Size => $len,
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);
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$pos += $len;
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}
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return 1;
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}
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#------------------------------------------------------------------------------
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# Process APP12 Picture Info segment (ref PH)
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# Inputs: 0) ExifTool object reference, 1) Directory information ref, 2) tag table ref
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# Returns: 1 on success, 0 if this wasn't a recognized APP12
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sub ProcessAPP12($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $dirStart = $$dirInfo{DirStart} || 0;
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my $dirLen = $$dirInfo{DirLen} || (length($$dataPt) - $dirStart);
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if ($dirLen != $dirStart + length($$dataPt)) {
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my $buff = substr($$dataPt, $dirStart, $dirLen);
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$dataPt = \$buff;
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} else {
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pos($$dataPt) = $$dirInfo{DirStart};
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}
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my $verbose = $et->Options('Verbose');
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my $success = 0;
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my $section = '';
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pos($$dataPt) = 0;
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# this regular expression is a bit complex, but basically we are looking for
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# section headers (eg. "[Camera Info]") and tag/value pairs (eg. "tag=value",
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# where "value" may contain white space), separated by spaces or CR/LF.
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# (APP12 uses CR/LF, but Olympus TextualInfo is similar and uses spaces)
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while ($$dataPt =~ /(\[.*?\]|[\w#-]+=[\x20-\x7e]+?(?=\s*([\n\r\0]|[\w#-]+=|\[|$)))/g) {
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my $token = $1;
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# was this a section name?
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if ($token =~ /^\[(.*)\]/) {
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$et->VerboseDir($1) if $verbose;
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$section = ($token =~ /\[(\S+) ?Info\]/i) ? $1 : '';
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$success = 1;
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next;
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}
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$et->VerboseDir($$dirInfo{DirName}) if $verbose and not $success;
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$success = 1;
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my ($tag, $val) = ($token =~ /(\S+)=(.+)/);
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
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$verbose and $et->VerboseInfo($tag, $tagInfo, Value => $val);
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unless ($tagInfo) {
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# add new tag to table
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$tagInfo = { Name => ucfirst $tag };
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# put in Camera group if information in "Camera" section
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$$tagInfo{Groups} = { 2 => 'Camera' } if $section =~ /camera/i;
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AddTagToTable($tagTablePtr, $tag, $tagInfo);
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}
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$et->FoundTag($tagInfo, $val);
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}
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return $success;
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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::APP12 - Read APP12 meta information
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=head1 SYNOPSIS
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This module is loaded automatically by Image::ExifTool when required.
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to interpret
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APP12 meta information.
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=head1 AUTHOR
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Copyright 2003-2016, 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 ACKNOWLEDGEMENTS
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Thanks to Heinrich Giesen for his help decoding APP12 "Ducky" information.
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=head1 SEE ALSO
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|
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L<Image::ExifTool::TagNames/APP12 Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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