/usr/share/perl5/Image/Info/PPM.pm is in libimage-info-perl 1.28-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | package Image::Info::PPM;
# Copyright 2000, Gisle Aas.
#
# This library is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
=begin register
MAGIC: /^P[1-6]/;
=item PBM/PGM/PPM
All information available is extracted.
=end register
=cut
use strict;
use vars qw/$VERSION/;
$VERSION = 0.02;
sub process_file {
my($info, $fh) = @_;
my @header;
my $type;
my $num_wanted = 3;
my $binary;
local($/, $_) = ("\n");
while (<$fh>) {
if (s/#\s*(.*)//) {
$info->push_info(0, "Comment", $1);
}
push(@header, split(' '));
if (!$type && @header) {
$type = shift(@header);
$type =~ s/^P// || die;
$binary++ if $type > 3;
$type = "p" . qw/p b g/[$type % 3] . "m";
$num_wanted = 2 if $type eq "pbm";
}
for (@header) {
unless (/^\d+$/) {
die "Badly formatted $type file";
}
}
next unless @header >= $num_wanted;
# Now we know everything there is to know...
$info->push_info(0, "file_media_type" => "image/$type");
$info->push_info(0, "file_ext" => "$type");
$info->push_info(0, "width", shift @header);
$info->push_info(0, "height", shift @header);
$info->push_info(0, "resolution", "1/1");
if ($type eq "ppm") {
my $MSV = shift @header;
$info->push_info(0, "MaxSampleValue", $MSV);
$info->push_info(0, "color_type", "RGB");
my $double = 1; $double = 2 if $MSV > 256;
$info->push_info(0, "SamplesPerPixel", $double * 3);
if ($binary) {
for (1..3) {
$info->push_info(0, "BitsPerSample", int(log($MSV + 1) / log(2) ) );
}
}
}
else {
$info->push_info(0, "color_type", "Gray");
$info->push_info(0, "SamplesPerPixel", 1);
$info->push_info(0, "BitsPerSample", ($type eq "pbm") ? 1 : 8)
if $binary;
$info->push_info(0, "MaxSampleValue", shift @header) if $type ne 'pbm';
}
last;
}
}
1;
=pod
=head1 NAME
Image::Info:PPM - PPM support Image::Info
=head1 SYNOPSIS
use Image::Info qw(image_info dim);
my $info = image_info("image.ppm");
if (my $error = $info->{error}) {
die "Can't parse image info: $error\n";
}
my($w, $h) = dim($info);
=head1 DESCRIPTION
This modules adds ppm support to Image::Info.
It is loaded and used automatically.
=head1 METHODS
=head2 process_file()
$info->process_file($source, $options);
Processes one file and sets the found info fields in the C<$info> object.
=head1 AUTHOR
Gisle Aas.
=head1 LICENSE
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut
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