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