lib: add oid registry utility
Imported from linux kernel v5.3:
build_OID_registry without changes
oid_registry.h without changes
oid_registry.c with changes marked as __UBOOT__
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/scripts/build_OID_registry b/scripts/build_OID_registry
new file mode 100755
index 0000000..d7fc32e
--- /dev/null
+++ b/scripts/build_OID_registry
@@ -0,0 +1,203 @@
+#!/usr/bin/perl -w
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Build a static ASN.1 Object Identified (OID) registry
+#
+# Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
+# Written by David Howells (dhowells@redhat.com)
+#
+
+use strict;
+
+my @names = ();
+my @oids = ();
+
+if ($#ARGV != 1) {
+ print STDERR "Format: ", $0, " <in-h-file> <out-c-file>\n";
+ exit(2);
+}
+
+#
+# Open the file to read from
+#
+open IN_FILE, "<$ARGV[0]" || die;
+while (<IN_FILE>) {
+ chomp;
+ if (m!\s+OID_([a-zA-z][a-zA-Z0-9_]+),\s+/[*]\s+([012][.0-9]*)\s+[*]/!) {
+ push @names, $1;
+ push @oids, $2;
+ }
+}
+close IN_FILE || die;
+
+#
+# Open the files to write into
+#
+open C_FILE, ">$ARGV[1]" or die;
+print C_FILE "/*\n";
+print C_FILE " * Automatically generated by ", $0, ". Do not edit\n";
+print C_FILE " */\n";
+
+#
+# Split the data up into separate lists and also determine the lengths of the
+# encoded data arrays.
+#
+my @indices = ();
+my @lengths = ();
+my $total_length = 0;
+
+for (my $i = 0; $i <= $#names; $i++) {
+ my $name = $names[$i];
+ my $oid = $oids[$i];
+
+ my @components = split(/[.]/, $oid);
+
+ # Determine the encoded length of this OID
+ my $size = $#components;
+ for (my $loop = 2; $loop <= $#components; $loop++) {
+ my $c = $components[$loop];
+
+ # We will base128 encode the number
+ my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
+ $tmp = int($tmp / 7);
+ $size += $tmp;
+ }
+ push @lengths, $size;
+ push @indices, $total_length;
+ $total_length += $size;
+}
+
+#
+# Emit the look-up-by-OID index table
+#
+print C_FILE "\n";
+if ($total_length <= 255) {
+ print C_FILE "static const unsigned char oid_index[OID__NR + 1] = {\n";
+} else {
+ print C_FILE "static const unsigned short oid_index[OID__NR + 1] = {\n";
+}
+for (my $i = 0; $i <= $#names; $i++) {
+ print C_FILE "\t[OID_", $names[$i], "] = ", $indices[$i], ",\n"
+}
+print C_FILE "\t[OID__NR] = ", $total_length, "\n";
+print C_FILE "};\n";
+
+#
+# Encode the OIDs
+#
+my @encoded_oids = ();
+
+for (my $i = 0; $i <= $#names; $i++) {
+ my @octets = ();
+
+ my @components = split(/[.]/, $oids[$i]);
+
+ push @octets, $components[0] * 40 + $components[1];
+
+ for (my $loop = 2; $loop <= $#components; $loop++) {
+ my $c = $components[$loop];
+
+ # Base128 encode the number
+ my $tmp = ($c == 0) ? 0 : int(log($c)/log(2));
+ $tmp = int($tmp / 7);
+
+ for (; $tmp > 0; $tmp--) {
+ push @octets, (($c >> $tmp * 7) & 0x7f) | 0x80;
+ }
+ push @octets, $c & 0x7f;
+ }
+
+ push @encoded_oids, \@octets;
+}
+
+#
+# Create a hash value for each OID
+#
+my @hash_values = ();
+for (my $i = 0; $i <= $#names; $i++) {
+ my @octets = @{$encoded_oids[$i]};
+
+ my $hash = $#octets;
+ foreach (@octets) {
+ $hash += $_ * 33;
+ }
+
+ $hash = ($hash >> 24) ^ ($hash >> 16) ^ ($hash >> 8) ^ ($hash);
+
+ push @hash_values, $hash & 0xff;
+}
+
+#
+# Emit the OID data
+#
+print C_FILE "\n";
+print C_FILE "static const unsigned char oid_data[", $total_length, "] = {\n";
+for (my $i = 0; $i <= $#names; $i++) {
+ my @octets = @{$encoded_oids[$i]};
+ print C_FILE "\t";
+ print C_FILE $_, ", " foreach (@octets);
+ print C_FILE "\t// ", $names[$i];
+ print C_FILE "\n";
+}
+print C_FILE "};\n";
+
+#
+# Build the search index table (ordered by length then hash then content)
+#
+my @index_table = ( 0 .. $#names );
+
+@index_table = sort {
+ my @octets_a = @{$encoded_oids[$a]};
+ my @octets_b = @{$encoded_oids[$b]};
+
+ return $hash_values[$a] <=> $hash_values[$b]
+ if ($hash_values[$a] != $hash_values[$b]);
+ return $#octets_a <=> $#octets_b
+ if ($#octets_a != $#octets_b);
+ for (my $i = $#octets_a; $i >= 0; $i--) {
+ return $octets_a[$i] <=> $octets_b[$i]
+ if ($octets_a[$i] != $octets_b[$i]);
+ }
+ return 0;
+
+} @index_table;
+
+#
+# Emit the search index and hash value table
+#
+print C_FILE "\n";
+print C_FILE "static const struct {\n";
+print C_FILE "\tunsigned char hash;\n";
+if ($#names <= 255) {
+ print C_FILE "\tenum OID oid : 8;\n";
+} else {
+ print C_FILE "\tenum OID oid : 16;\n";
+}
+print C_FILE "} oid_search_table[OID__NR] = {\n";
+for (my $i = 0; $i <= $#names; $i++) {
+ my @octets = @{$encoded_oids[$index_table[$i]]};
+ printf(C_FILE "\t[%3u] = { %3u, OID_%-35s }, // ",
+ $i,
+ $hash_values[$index_table[$i]],
+ $names[$index_table[$i]]);
+ printf C_FILE "%02x", $_ foreach (@octets);
+ print C_FILE "\n";
+}
+print C_FILE "};\n";
+
+#
+# Emit the OID debugging name table
+#
+#print C_FILE "\n";
+#print C_FILE "const char *const oid_name_table[OID__NR + 1] = {\n";
+#
+#for (my $i = 0; $i <= $#names; $i++) {
+# print C_FILE "\t\"", $names[$i], "\",\n"
+#}
+#print C_FILE "\t\"Unknown-OID\"\n";
+#print C_FILE "};\n";
+
+#
+# Polish off
+#
+close C_FILE or die;