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