Class for parsing and evaluating RFC 5280 NameConstraints.

net/der/tag.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/logging.h"
 #include "net/der/tag.h"
 
 namespace net {
 
 namespace der {
 
 Tag ContextSpecificConstructed(uint8_t class_number) {
   DCHECK_EQ(class_number, class_number & kTagNumberMask);
   return (class_number & kTagNumberMask) | kTagConstructed |
          kTagContextSpecific;
 }
 
 Tag ContextSpecificPrimitive(uint8_t base) {
   DCHECK_EQ(base, base & kTagNumberMask);
   return (base & kTagNumberMask) | kTagPrimitive | kTagContextSpecific;
 }
 
+bool IsContextSpecific(Tag tag) {
+  return (tag & kTagClassMask) == kTagContextSpecific;
+}
+
 bool IsConstructed(Tag tag) {
   return (tag & kTagConstructionMask) == kTagConstructed;
 }
 
+uint8_t GetTagNumber(Tag tag) {
+  return tag & kTagNumberMask;
+}
+
 }  // namespace der
 
 }  // namespace net