#!/usr/bin/perl -w
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Build a static ASN.1 Object Identified (OID) registry
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#
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# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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# Written by David Howells (dhowells@redhat.com)
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#
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use strict;
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my @names = ();
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my @oids = ();
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if ($#ARGV != 1) {
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print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
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exit(2);
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}
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#
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# Open the file to read from
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#
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open IN_FILE, "<$ARGV[0]" || die;
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while (<IN_FILE>) {
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chomp;
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if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
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push @names, $1;
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push @oids, $2;
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}
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}
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close IN_FILE || die;
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#
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# Open the files to write into
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#
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open C_FILE, ">$ARGV[1]" or die;
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print C_FILE "/*\n";
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print C_FILE " * Automatically generated by ", $0, ". Do not edit\n";
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print C_FILE " */\n";
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#
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# Split the data up into separate lists and also determine the lengths of the
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# encoded data arrays.
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#
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my @indices = ();
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my @lengths = ();
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my $total_length = 0;
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for (my $i = 0; $i <= $#names; $i++) {
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my $name = $names[$i];
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my $oid = $oids[$i];
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my @components = split(/[.]/, $oid);
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# Determine the encoded length of this OID
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my $size = $#components;
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for (my $loop = 2; $loop <= $#components; $loop++) {
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my $c = $components[$loop];
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# We will base128 encode the number
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my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
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$tmp = int($tmp / 7);
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$size += $tmp;
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}
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push @lengths, $size;
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push @indices, $total_length;
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$total_length += $size;
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}
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#
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# Emit the look-up-by-OID index table
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#
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print C_FILE "\n";
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if ($total_length <= 255) {
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print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
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} else {
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print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
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}
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for (my $i = 0; $i <= $#names; $i++) {
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print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
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}
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print C_FILE "\t[OID__NR] = ", $total_length, "\n";
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print C_FILE "};\n";
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#
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# Encode the OIDs
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#
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my @encoded_oids = ();
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for (my $i = 0; $i <= $#names; $i++) {
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my @octets = ();
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my @components = split(/[.]/, $oids[$i]);
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push @octets, $components[0] * 40 + $components[1];
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for (my $loop = 2; $loop <= $#components; $loop++) {
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my $c = $components[$loop];
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# Base128 encode the number
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my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
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$tmp = int($tmp / 7);
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for (; $tmp > 0; $tmp--) {
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push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
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}
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push @octets, $c & 0x7f;
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}
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push @encoded_oids, \@octets;
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}
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#
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# Create a hash value for each OID
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#
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my @hash_values = ();
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for (my $i = 0; $i <= $#names; $i++) {
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my @octets = @{$encoded_oids[$i]};
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my $hash = $#octets;
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foreach (@octets) {
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$hash += $_ * 33;
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}
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$hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
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push @hash_values, $hash & 0xff;
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}
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#
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# Emit the OID data
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#
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print C_FILE "\n";
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print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
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for (my $i = 0; $i <= $#names; $i++) {
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my @octets = @{$encoded_oids[$i]};
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print C_FILE "\t";
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print C_FILE $_, ", " foreach (@octets);
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print C_FILE "\t// ", $names[$i];
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print C_FILE "\n";
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}
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print C_FILE "};\n";
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#
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# Build the search index table (ordered by length then hash then content)
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#
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my @index_table = ( 0 .. $#names );
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@index_table = sort {
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my @octets_a = @{$encoded_oids[$a]};
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my @octets_b = @{$encoded_oids[$b]};
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return $hash_values[$a] <=> $hash_values[$b]
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if ($hash_values[$a] != $hash_values[$b]);
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return $#octets_a <=> $#octets_b
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if ($#octets_a != $#octets_b);
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for (my $i = $#octets_a; $i >= 0; $i--) {
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return $octets_a[$i] <=> $octets_b[$i]
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if ($octets_a[$i] != $octets_b[$i]);
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}
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return 0;
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} @index_table;
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#
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# Emit the search index and hash value table
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#
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print C_FILE "\n";
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print C_FILE "static const struct {\n";
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print C_FILE "\tunsigned char hash;\n";
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if ($#names <= 255) {
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print C_FILE "\tenum OID oid : 8;\n";
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} else {
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print C_FILE "\tenum OID oid : 16;\n";
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}
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print C_FILE "} oid_search_table[OID__NR] = {\n";
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for (my $i = 0; $i <= $#names; $i++) {
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my @octets = @{$encoded_oids[$index_table[$i]]};
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printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
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$i,
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$hash_values[$index_table[$i]],
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$names[$index_table[$i]]);
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printf C_FILE "%02x", $_ foreach (@octets);
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print C_FILE "\n";
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}
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print C_FILE "};\n";
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#
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# Emit the OID debugging name table
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#
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#print C_FILE "\n";
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#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
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#
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#for (my $i = 0; $i <= $#names; $i++) {
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# print C_FILE "\t\"", $names[$i], "\",\n"
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#}
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#print C_FILE "\t\"Unknown-OID\"\n";
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#print C_FILE "};\n";
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#
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# Polish off
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#
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close C_FILE or die;
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