#!/usr/bin/perl
# pixel.cgi -- Generate a single-pixel GIF of a given color.
#
# Usage:
# <img src="pixel.cgi/CC9966.gif" width=25 height=25>
#
# Dave W. Smith <dws@davewsmith.com>
my($rgb) = $ENV{PATH_INFO} =~ m|/([0-9A-Za-z]{6})(?:\.gif)?$|i;
$rgb ||= '888888';
my $gif = pack("H*",
'47494638396101000100B30000' . $rgb .
'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF' .
'FFFFFFFFFFFFFFFFFFFFFFFFFF2C0000' .
'0000010001000004021044003B'
);
binmode(STDOUT);
print "Content-type: image/gif\r\n";
print "Content-length: ", length($gif), "\r\n";
print "\r\n";
print $gif;
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