#!/usr/local/bin/perl

use strict;

my %xref_tbl;
my %oid_tbl;

my ($mac_file, $xref_file) = @ARGV;

open(IN, $mac_file) || die "Can't open $mac_file";

# Read in OID nid values for a lookup table.

while (<IN>)
	{
	chomp;
	my ($name, $num) = /^(\S+)\s+(\S+)$/;
	$oid_tbl{$name} = $num;
	}
close IN;

open(IN, $xref_file) || die "Can't open $xref_file";

my $ln = 1;

while (<IN>)
	{
	chomp;
	s/#.*$//;
	next if (/^\S*$/);
	my ($xr, $p1, $p2) = /^(\S+)\s+(\S+)\s+(\S+)/;
	check_oid($xr);
	check_oid($p1);
	check_oid($p2);
	$xref_tbl{$xr} = [$p1, $p2, $ln];
	}

my @xrkeys = keys %xref_tbl;

my @srt1 = sort { $oid_tbl{$a} <=> $oid_tbl{$b}} @xrkeys;

for(my $i = 0; $i <= $#srt1; $i++)
	{
	$xref_tbl{$srt1[$i]}[2] = $i;
	}

my @srt2 = sort
	{
	my$ap1 = $oid_tbl{$xref_tbl{$a}[0]};
	my$bp1 = $oid_tbl{$xref_tbl{$b}[0]};
	return $ap1 - $bp1 if ($ap1 != $bp1);
	my$ap2 = $oid_tbl{$xref_tbl{$a}[1]};
	my$bp2 = $oid_tbl{$xref_tbl{$b}[1]};

	return $ap2 - $bp2;
	} @xrkeys;

my $pname = $0;

$pname =~ s|^.[^/]/||;

print <<EOF;
/* AUTOGENERATED BY $pname, DO NOT EDIT */

typedef struct {
    int sign_id;
    int hash_id;
    int pkey_id;
} nid_triple;

static const nid_triple sigoid_srt[] = {
EOF

foreach (@srt1)
	{
	my $xr = $_;
	my ($p1, $p2) = @{$xref_tbl{$_}};
	my $o1 = "    {NID_$xr, NID_$p1,";
	my $o2 = "NID_$p2},";
        if (length("$o1 $o2") < 78)
		{
		print "$o1 $o2\n";
		}
	else
		{
		print "$o1\n     $o2\n";
		}
        }

print "};";
print <<EOF;


static const nid_triple *const sigoid_srt_xref[] = {
EOF

foreach (@srt2)
	{
	my ($p1, $p2, $x) = @{$xref_tbl{$_}};
	# If digest or signature algorithm is "undef" then the algorithm
	# needs special handling and is excluded from the cross reference table.
	next if $p1 eq "undef" || $p2 eq "undef";
	print "    \&sigoid_srt\[$x\],\n";
	}

print "};\n";

sub check_oid
	{
	my ($chk) = @_;
	if (!exists $oid_tbl{$chk})
		{
		die "Not Found \"$chk\"\n";
		}
	}