/usr/share/perl5/Gscan2pdf/NetPBM.pm is in gscan2pdf 1.2.3-1.
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 | package Gscan2pdf::NetPBM;
use strict;
use warnings;
use Readonly;
Readonly my $BINARY_BITMAP => 4;
Readonly my $BINARY_GRAYMAP => 5;
Readonly my $BITS_PER_BYTE => 8;
Readonly my $BITMAP_BYTES_PER_PIXEL => 1 / $BITS_PER_BYTE;
Readonly my $GRAYMAP_BYTES_PER_PIXEL => 1;
Readonly my $PIXMAP_BYTES_PER_PIXEL => 3;
our $VERSION = '1.2.3';
# Return file size expected by PNM header
sub file_size_from_header {
my $filename = shift;
open my $fh, '<', $filename or return 0;
my $header = <$fh>;
my $magic_value;
if ( $header =~ /^P(\d)\n/xsm ) {
$magic_value = $1;
}
else {
close $fh or return 0;
return 0;
}
if ( $magic_value < $BINARY_BITMAP ) {
close $fh or return 0;
return 0;
}
my $line = <$fh>;
$header .= $line;
while ( $line =~ /^(\#|\s*\n)/xsm ) {
$line = <$fh>;
$header .= $line;
}
if ( $line =~ /(\d*)\ (\d*)\n/xsm ) {
my ( $width, $height ) = ( $1, $2 );
if ( $magic_value == $BINARY_BITMAP ) {
my $mod = $width % $BITS_PER_BYTE;
if ( $mod > 0 ) { $width += $BITS_PER_BYTE - $mod }
}
my $datasize = $width * $height * (
$magic_value == $BINARY_BITMAP ? $BITMAP_BYTES_PER_PIXEL
: (
$magic_value == $BINARY_GRAYMAP ? $GRAYMAP_BYTES_PER_PIXEL
: $PIXMAP_BYTES_PER_PIXEL
)
);
if ( $magic_value > $BINARY_BITMAP ) {
$line = <$fh>;
$header .= $line;
}
close $fh or return 0;
return length($header) + $datasize;
}
else {
close $fh or return 0;
return 0;
}
}
1;
__END__
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