/usr/share/perl5/Image/ExifTool/PGF.pm is in libimage-exiftool-perl 8.60-2.
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# File: PGF.pm
#
# Description: Read Progressive Graphics File meta information
#
# Revisions: 2011/01/25 - P. Harvey Created
#
# References: 1) http://www.libpgf.org/
# 2) http://www.exiv2.org/
#------------------------------------------------------------------------------
package Image::ExifTool::PGF;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.01';
# PGF header information
%Image::ExifTool::PGF::Main = (
GROUPS => { 0 => 'File', 1 => 'File', 2 => 'Image' },
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
PRIORITY => 2, # (to take precedence over PNG tags from embedded image)
NOTES => q{
The following table lists information extracted from the header of
Progressive Graphics File (PGF) images. As well, information is extracted
from the embedded PNG metadata image if it exists. See
L<http://www.libpgf.org/> for the PGF specification.
},
3 => {
Name => 'PGFVersion',
PrintConv => 'sprintf("0x%.2x", $val)',
# this is actually a bitmask (ref digikam PGFtypes.h):
# 0x02 - data structure PGFHeader of major version 2
# 0x04 - 32-bit values
# 0x08 - supports regions of interest
# 0x10 - new coding scheme since major version 5
# 0x20 - new HeaderSize: 32 bits instead of 16 bits
},
8 => { Name => 'ImageWidth', Format => 'int32u' },
12 => { Name => 'ImageHeight', Format => 'int32u' },
16 => 'PyramidLevels',
17 => 'Quality',
18 => 'BitsPerPixel',
19 => 'ColorComponents',
20 => {
Name => 'ColorMode',
RawConv => '$$self{PGFColorMode} = $val',
PrintConvColumns => 2,
PrintConv => {
0 => 'Bitmap',
1 => 'Grayscale',
2 => 'Indexed',
3 => 'RGB',
4 => 'CMYK',
7 => 'Multichannel',
8 => 'Duotone',
9 => 'Lab',
},
},
21 => { Name => 'BackgroundColor', Format => 'int8u[3]' },
);
#------------------------------------------------------------------------------
# Extract information from a PGF image
# Inputs: 0) ExifTool object reference, 1) dirInfo reference
# Returns: 1 on success, 0 if this wasn't a valid PGF file
sub ProcessPGF($$)
{
my ($exifTool, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my $buff;
# read header and check magic number
return 0 unless $raf->Read($buff, 24) == 24 and $buff =~ /^PGF(.)/s;
my $ver = ord $1;
$exifTool->SetFileType();
SetByteOrder('II');
# currently support only version 0x36
unless ($ver == 0x36) {
$exifTool->Error(sprintf('Unsupported PGF version 0x%.2x', $ver));
return 1;
}
# extract information from the PGF header
my $tagTablePtr = GetTagTable('Image::ExifTool::PGF::Main');
$exifTool->ProcessDirectory({ DataPt => \$buff, DataPos => 0 }, $tagTablePtr);
my $len = Get32u(\$buff, 4) - 16; # length of post-header data
# skip colour table if necessary
$len -= $raf->Seek(1024, 1) ? 1024 : $len if $$exifTool{PGFColorMode} == 2;
# extract information from the embedded metadata image (PNG format)
if ($len > 0 and $len < 0x1000000 and $raf->Read($buff, $len) == $len) {
$exifTool->ExtractInfo(\$buff, { ReEntry => 1 });
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::PGF - Read Progressive Graphics File meta information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to extract meta
information from Progressive Graphics File (PGF) images.
=head1 AUTHOR
Copyright 2003-2011, 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.libpgf.org/>
=item L<http://www.exiv2.org/>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/PGF Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
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