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|
#!/usr/bin/perl
#
use strict;
use warnings;
use XML::LibXML;
sub usage {
"Usage: $0 draft-ietf-httpbis-header-compression.xml\n";
}
my $file = $ARGV[0] or die usage;
die usage unless -f $file;
open my $fh, '<', $file or die $!;
my $doc = XML::LibXML->load_xml( IO => $fh );
my $hufftable =
XML::LibXML::XPathExpression->new(
'//section[@title="Huffman Code"]//artwork');
my $value = $doc->findvalue($hufftable);
die "cant find Huffman Codes section" unless $value;
print << 'EOF';
package Protocol::HTTP2::HuffmanCodes;
use strict;
use warnings;
require Exporter;
our @ISA = qw(Exporter);
our ( %hcodes, %rhcodes, $hre );
our @EXPORT = qw(%hcodes %rhcodes $hre);
%hcodes = (
EOF
for ( split /\n/, $value ) {
my ( $code, $hex, $bit ) = (/\((.{3})\).+\s([0-9a-f]+)\s+\[\s*(\d+)\]/)
or next;
printf " %3d => '%0${bit}b',\n", $code, hex($hex);
}
print << 'EOF';
);
%rhcodes = reverse %hcodes;
{
local $" = '|';
$hre = qr/(?:^|\G)(@{[ keys %rhcodes ]})/;
}
1;
EOF
|
