/usr/share/perl5/Image/ExifTool/PPM.pm is in libimage-exiftool-perl 8.60-2.
This file is owned by root:root, with mode 0o644.
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# File: PPM.pm
#
# Description: Read and write PPM meta information
#
# Revisions: 09/03/2005 - P. Harvey Created
#
# References: 1) http://netpbm.sourceforge.net/doc/ppm.html
# 2) http://netpbm.sourceforge.net/doc/pgm.html
# 3) http://netpbm.sourceforge.net/doc/pbm.html
#------------------------------------------------------------------------------
package Image::ExifTool::PPM;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.05';
#------------------------------------------------------------------------------
# Read or write information in a PPM/PGM/PBM image
# Inputs: 0) ExifTool object reference, 1) Directory information reference
# Returns: 1 on success, 0 if this wasn't a valid PPM file, -1 on write error
sub ProcessPPM($$)
{
my ($exifTool, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my $outfile = $$dirInfo{OutFile};
my $verbose = $exifTool->Options('Verbose');
my $out = $exifTool->Options('TextOut');
my ($buff, $num, $type, %info);
#
# read as much of the image as necessary to extract the header and comments
#
for (;;) {
if (defined $buff) {
# need to read some more data
my $tmp;
return 0 unless $raf->Read($tmp, 1024);
$buff .= $tmp;
} else {
return 0 unless $raf->Read($buff, 1024);
}
# verify this is a valid PPM file
return 0 unless $buff =~ /^P([1-6])\s+/g;
$num = $1;
# note: may contain comments starting with '#'
if ($buff =~ /\G#/gc) {
# must read more if we are in the middle of a comment
next unless $buff =~ /\G ?(.*\n(#.*\n)*)\s*/g;
$info{Comment} = $1;
next if $buff =~ /\G#/gc;
} else {
delete $info{Comment};
}
next unless $buff =~ /\G(\S+)\s+(\S+)\s/g;
$info{ImageWidth} = $1;
$info{ImageHeight} = $2;
$type = [qw{PPM PBM PGM}]->[$num % 3];
last if $type eq 'PBM'; # (no MaxVal for PBM images)
if ($buff =~ /\G\s*#/gc) {
next unless $buff =~ /\G ?(.*\n(#.*\n)*)\s*/g;
$info{Comment} = '' unless exists $info{Comment};
$info{Comment} .= $1;
next if $buff =~ /\G#/gc;
}
next unless $buff =~ /\G(\S+)\s/g;
$info{MaxVal} = $1;
last;
}
# validate numerical values
foreach (keys %info) {
next if $_ eq 'Comment';
return 0 unless $info{$_} =~ /^\d+$/;
}
if (defined $info{Comment}) {
$info{Comment} =~ s/^# ?//mg; # remove "# " at the start of each line
$info{Comment} =~ s/\n$//; # remove trailing newline
}
$exifTool->SetFileType($type);
my $len = pos($buff);
#
# rewrite the file if requested
#
if ($outfile) {
my $nvHash;
my $newComment = $exifTool->GetNewValues('Comment', \$nvHash);
my $oldComment = $info{Comment};
if (Image::ExifTool::IsOverwriting($nvHash, $oldComment)) {
++$exifTool->{CHANGED};
$exifTool->VerboseValue('- Comment', $oldComment) if defined $oldComment;
$exifTool->VerboseValue('+ Comment', $newComment) if defined $newComment;
} else {
$newComment = $oldComment; # use existing comment
}
my $hdr = "P$num\n";
if (defined $newComment) {
$newComment =~ s/\n/\n# /g;
$hdr .= "# $newComment\n";
}
$hdr .= "$info{ImageWidth} $info{ImageHeight}\n";
$hdr .= "$info{MaxVal}\n" if $type ne 'PBM';
# write header and start of image
Write($outfile, $hdr, substr($buff, $len)) or return -1;
# copy over the rest of the image
while ($raf->Read($buff, 0x10000)) {
Write($outfile, $buff) or return -1;
}
return 1;
}
#
# save extracted information
#
if ($verbose > 2) {
print $out "$type header ($len bytes):\n";
Image::ExifTool::HexDump(\$buff, $len, Out => $out);
}
my $tag;
foreach $tag (qw{Comment ImageWidth ImageHeight MaxVal}) {
$exifTool->FoundTag($tag, $info{$tag}) if defined $info{$tag};
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::PPM - Read and write PPM meta information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to read and
write PPM (Portable Pixel Map), PGM (Portable Gray Map) and PBM (Portable
BitMap) 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://netpbm.sourceforge.net/doc/ppm.html>
=item L<http://netpbm.sourceforge.net/doc/pgm.html>
=item L<http://netpbm.sourceforge.net/doc/pbm.html>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/PPM Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
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