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#------------------------------------------------------------------------------
# File: PCX.pm
#
# Description: Read metadata from PC Paintbrush files
#
# Revisions: 2018/12/12 - P. Harvey Created
#
# References: 1) http://qzx.com/pc-gpe/pcx.txt
# 2) https://www.fileformat.info/format/pcx/corion.htm
#------------------------------------------------------------------------------
package Image::ExifTool::PCX;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.00';
# PCX info
%Image::ExifTool::PCX::Main = (
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
GROUPS => { 0 => 'File', 1 => 'File', 2 => 'Image' },
NOTES => 'Tags extracted from PC Paintbrush images.',
DATAMEMBER => [ 0x04, 0x05 ],
0x00 => {
Name => 'Manufacturer',
PrintConv => { 10 => 'ZSoft' },
},
0x01 => {
Name => 'Software',
PrintConv => {
0 => 'PC Paintbrush 2.5',
2 => 'PC Paintbrush 2.8 (with palette)',
3 => 'PC Paintbrush 2.8 (without palette)',
4 => 'PC Paintbrush for Windows',
5 => 'PC Paintbrush 3.0+',
},
},
0x02 => { Name => 'Encoding', PrintConv => { 1 => 'RLE' } },
0x03 => 'BitsPerPixel',
0x04 => {
Name => 'LeftMargin',
Format => 'int16u',
RawConv => '$$self{LeftMargin} = $val',
},
0x06 => {
Name => 'TopMargin',
Format => 'int16u',
RawConv => '$$self{TopMargin} = $val',
},
0x08 => {
Name => 'ImageWidth',
Format => 'int16u',
Notes => 'adjusted for LeftMargin',
ValueConv => '$val - $$self{LeftMargin} + 1',
},
0x0a => {
Name => 'ImageHeight',
Format => 'int16u',
Notes => 'adjusted for TopMargin',
ValueConv => '$val - $$self{TopMargin} + 1',
},
0x0c => 'XResolution',
0x0e => 'YResolution',
0x41 => 'ColorPlanes',
0x42 => { Name => 'BytesPerLine', Format => 'int16u' },
0x44 => {
Name => 'ColorMode',
PrintConv => {
0 => 'n/a',
1 => 'Color Palette',
2 => 'Grayscale',
},
},
0x46 => { Name => 'ScreenWidth', Format => 'int16u', RawConv => '$val or undef' },
0x48 => { Name => 'ScreenHeight', Format => 'int16u', RawConv => '$val or undef' },
);
#------------------------------------------------------------------------------
# Extract information from a PCX image
# Inputs: 0) ExifTool object reference, 1) dirInfo reference
# Returns: 1 on success, 0 if this wasn't a valid PCX file
sub ProcessPCX($$)
{
my ($et, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my $buff;
return 0 unless $raf->Read($buff, 0x50) == 0x50 and
$buff =~ /^\x0a[\0-\x05]\x01[\x01\x02\x04\x08].{64}[\0-\x02]/s;
SetByteOrder('II');
$et->SetFileType();
my %dirInfo = ( DirName => 'PCX', DataPt => \$buff );
my $tagTablePtr = GetTagTable('Image::ExifTool::PCX::Main');
return $et->ProcessBinaryData(\%dirInfo, $tagTablePtr);
}
1; # end
__END__
=head1 NAME
Image::ExifTool::PCX - Read metadata from PC Paintbrush files
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains routines required by Image::ExifTool to extract
information from PC Paintbrush (PCX) files.
=head1 AUTHOR
Copyright 2003-2021, Phil Harvey (philharvey66 at gmail.com)
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://qzx.com/pc-gpe/pcx.txt>
=item L<https://www.fileformat.info/format/pcx/corion.htm>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/PCX Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
|
