Loading...
1#!/usr/bin/perl -w
2# SPDX-License-Identifier: GPL-2.0-or-later
3#
4# Build a static ASN.1 Object Identified (OID) registry
5#
6# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
7# Written by David Howells (dhowells@redhat.com)
8#
9
10use strict;
11
12my @names = ();
13my @oids = ();
14
15if ($#ARGV != 1) {
16 print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
17 exit(2);
18}
19
20#
21# Open the file to read from
22#
23open IN_FILE, "<$ARGV[0]" || die;
24while (<IN_FILE>) {
25 chomp;
26 if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
27 push @names, $1;
28 push @oids, $2;
29 }
30}
31close IN_FILE || die;
32
33#
34# Open the files to write into
35#
36open C_FILE, ">$ARGV[1]" or die;
37print C_FILE "/*\n";
38print C_FILE " * Automatically generated by ", $0, ". Do not edit\n";
39print C_FILE " */\n";
40
41#
42# Split the data up into separate lists and also determine the lengths of the
43# encoded data arrays.
44#
45my @indices = ();
46my @lengths = ();
47my $total_length = 0;
48
49for (my $i = 0; $i <= $#names; $i++) {
50 my $name = $names[$i];
51 my $oid = $oids[$i];
52
53 my @components = split(/[.]/, $oid);
54
55 # Determine the encoded length of this OID
56 my $size = $#components;
57 for (my $loop = 2; $loop <= $#components; $loop++) {
58 my $c = $components[$loop];
59
60 # We will base128 encode the number
61 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
62 $tmp = int($tmp / 7);
63 $size += $tmp;
64 }
65 push @lengths, $size;
66 push @indices, $total_length;
67 $total_length += $size;
68}
69
70#
71# Emit the look-up-by-OID index table
72#
73print C_FILE "\n";
74if ($total_length <= 255) {
75 print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
76} else {
77 print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
78}
79for (my $i = 0; $i <= $#names; $i++) {
80 print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
81}
82print C_FILE "\t[OID__NR] = ", $total_length, "\n";
83print C_FILE "};\n";
84
85#
86# Encode the OIDs
87#
88my @encoded_oids = ();
89
90for (my $i = 0; $i <= $#names; $i++) {
91 my @octets = ();
92
93 my @components = split(/[.]/, $oids[$i]);
94
95 push @octets, $components[0] * 40 + $components[1];
96
97 for (my $loop = 2; $loop <= $#components; $loop++) {
98 my $c = $components[$loop];
99
100 # Base128 encode the number
101 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
102 $tmp = int($tmp / 7);
103
104 for (; $tmp > 0; $tmp--) {
105 push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
106 }
107 push @octets, $c & 0x7f;
108 }
109
110 push @encoded_oids, \@octets;
111}
112
113#
114# Create a hash value for each OID
115#
116my @hash_values = ();
117for (my $i = 0; $i <= $#names; $i++) {
118 my @octets = @{$encoded_oids[$i]};
119
120 my $hash = $#octets;
121 foreach (@octets) {
122 $hash += $_ * 33;
123 }
124
125 $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
126
127 push @hash_values, $hash & 0xff;
128}
129
130#
131# Emit the OID data
132#
133print C_FILE "\n";
134print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
135for (my $i = 0; $i <= $#names; $i++) {
136 my @octets = @{$encoded_oids[$i]};
137 print C_FILE "\t";
138 print C_FILE $_, ", " foreach (@octets);
139 print C_FILE "\t// ", $names[$i];
140 print C_FILE "\n";
141}
142print C_FILE "};\n";
143
144#
145# Build the search index table (ordered by length then hash then content)
146#
147my @index_table = ( 0 .. $#names );
148
149@index_table = sort {
150 my @octets_a = @{$encoded_oids[$a]};
151 my @octets_b = @{$encoded_oids[$b]};
152
153 return $hash_values[$a] <=> $hash_values[$b]
154 if ($hash_values[$a] != $hash_values[$b]);
155 return $#octets_a <=> $#octets_b
156 if ($#octets_a != $#octets_b);
157 for (my $i = $#octets_a; $i >= 0; $i--) {
158 return $octets_a[$i] <=> $octets_b[$i]
159 if ($octets_a[$i] != $octets_b[$i]);
160 }
161 return 0;
162
163} @index_table;
164
165#
166# Emit the search index and hash value table
167#
168print C_FILE "\n";
169print C_FILE "static const struct {\n";
170print C_FILE "\tunsigned char hash;\n";
171if ($#names <= 255) {
172 print C_FILE "\tenum OID oid : 8;\n";
173} else {
174 print C_FILE "\tenum OID oid : 16;\n";
175}
176print C_FILE "} oid_search_table[OID__NR] = {\n";
177for (my $i = 0; $i <= $#names; $i++) {
178 my @octets = @{$encoded_oids[$index_table[$i]]};
179 printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
180 $i,
181 $hash_values[$index_table[$i]],
182 $names[$index_table[$i]]);
183 printf C_FILE "%02x", $_ foreach (@octets);
184 print C_FILE "\n";
185}
186print C_FILE "};\n";
187
188#
189# Emit the OID debugging name table
190#
191#print C_FILE "\n";
192#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
193#
194#for (my $i = 0; $i <= $#names; $i++) {
195# print C_FILE "\t\"", $names[$i], "\",\n"
196#}
197#print C_FILE "\t\"Unknown-OID\"\n";
198#print C_FILE "};\n";
199
200#
201# Polish off
202#
203close C_FILE or die;
1#!/usr/bin/perl -w
2# SPDX-License-Identifier: GPL-2.0-or-later
3#
4# Build a static ASN.1 Object Identified (OID) registry
5#
6# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
7# Written by David Howells (dhowells@redhat.com)
8#
9
10use strict;
11use Cwd qw(abs_path);
12
13my @names = ();
14my @oids = ();
15
16if ($#ARGV != 1) {
17 print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
18 exit(2);
19}
20
21my $abs_srctree = abs_path($ENV{'srctree'});
22
23#
24# Open the file to read from
25#
26open IN_FILE, "<$ARGV[0]" || die;
27while (<IN_FILE>) {
28 chomp;
29 if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
30 push @names, $1;
31 push @oids, $2;
32 }
33}
34close IN_FILE || die;
35
36#
37# Open the files to write into
38#
39open C_FILE, ">$ARGV[1]" or die;
40print C_FILE "/*\n";
41my $scriptname = $0;
42$scriptname =~ s#^\Q$abs_srctree/\E##;
43print C_FILE " * Automatically generated by ", $scriptname, ". Do not edit\n";
44print C_FILE " */\n";
45
46#
47# Split the data up into separate lists and also determine the lengths of the
48# encoded data arrays.
49#
50my @indices = ();
51my @lengths = ();
52my $total_length = 0;
53
54for (my $i = 0; $i <= $#names; $i++) {
55 my $name = $names[$i];
56 my $oid = $oids[$i];
57
58 my @components = split(/[.]/, $oid);
59
60 # Determine the encoded length of this OID
61 my $size = $#components;
62 for (my $loop = 2; $loop <= $#components; $loop++) {
63 my $c = $components[$loop];
64
65 # We will base128 encode the number
66 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
67 $tmp = int($tmp / 7);
68 $size += $tmp;
69 }
70 push @lengths, $size;
71 push @indices, $total_length;
72 $total_length += $size;
73}
74
75#
76# Emit the look-up-by-OID index table
77#
78print C_FILE "\n";
79if ($total_length <= 255) {
80 print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
81} else {
82 print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
83}
84for (my $i = 0; $i <= $#names; $i++) {
85 print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
86}
87print C_FILE "\t[OID__NR] = ", $total_length, "\n";
88print C_FILE "};\n";
89
90#
91# Encode the OIDs
92#
93my @encoded_oids = ();
94
95for (my $i = 0; $i <= $#names; $i++) {
96 my @octets = ();
97
98 my @components = split(/[.]/, $oids[$i]);
99
100 push @octets, $components[0] * 40 + $components[1];
101
102 for (my $loop = 2; $loop <= $#components; $loop++) {
103 my $c = $components[$loop];
104
105 # Base128 encode the number
106 my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
107 $tmp = int($tmp / 7);
108
109 for (; $tmp > 0; $tmp--) {
110 push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
111 }
112 push @octets, $c & 0x7f;
113 }
114
115 push @encoded_oids, \@octets;
116}
117
118#
119# Create a hash value for each OID
120#
121my @hash_values = ();
122for (my $i = 0; $i <= $#names; $i++) {
123 my @octets = @{$encoded_oids[$i]};
124
125 my $hash = $#octets;
126 foreach (@octets) {
127 $hash += $_ * 33;
128 }
129
130 $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
131
132 push @hash_values, $hash & 0xff;
133}
134
135#
136# Emit the OID data
137#
138print C_FILE "\n";
139print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
140for (my $i = 0; $i <= $#names; $i++) {
141 my @octets = @{$encoded_oids[$i]};
142 print C_FILE "\t";
143 print C_FILE $_, ", " foreach (@octets);
144 print C_FILE "\t// ", $names[$i];
145 print C_FILE "\n";
146}
147print C_FILE "};\n";
148
149#
150# Build the search index table (ordered by length then hash then content)
151#
152my @index_table = ( 0 .. $#names );
153
154@index_table = sort {
155 my @octets_a = @{$encoded_oids[$a]};
156 my @octets_b = @{$encoded_oids[$b]};
157
158 return $hash_values[$a] <=> $hash_values[$b]
159 if ($hash_values[$a] != $hash_values[$b]);
160 return $#octets_a <=> $#octets_b
161 if ($#octets_a != $#octets_b);
162 for (my $i = $#octets_a; $i >= 0; $i--) {
163 return $octets_a[$i] <=> $octets_b[$i]
164 if ($octets_a[$i] != $octets_b[$i]);
165 }
166 return 0;
167
168} @index_table;
169
170#
171# Emit the search index and hash value table
172#
173print C_FILE "\n";
174print C_FILE "static const struct {\n";
175print C_FILE "\tunsigned char hash;\n";
176if ($#names <= 255) {
177 print C_FILE "\tenum OID oid : 8;\n";
178} else {
179 print C_FILE "\tenum OID oid : 16;\n";
180}
181print C_FILE "} oid_search_table[OID__NR] = {\n";
182for (my $i = 0; $i <= $#names; $i++) {
183 my @octets = @{$encoded_oids[$index_table[$i]]};
184 printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
185 $i,
186 $hash_values[$index_table[$i]],
187 $names[$index_table[$i]]);
188 printf C_FILE "%02x", $_ foreach (@octets);
189 print C_FILE "\n";
190}
191print C_FILE "};\n";
192
193#
194# Emit the OID debugging name table
195#
196#print C_FILE "\n";
197#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
198#
199#for (my $i = 0; $i <= $#names; $i++) {
200# print C_FILE "\t\"", $names[$i], "\",\n"
201#}
202#print C_FILE "\t\"Unknown-OID\"\n";
203#print C_FILE "};\n";
204
205#
206# Polish off
207#
208close C_FILE or die;