1/* 2** 3** Copyright 2016, The Android Open Source Project 4** 5** Licensed under the Apache License, Version 2.0 (the "License"); 6** you may not use this file except in compliance with the License. 7** You may obtain a copy of the License at 8** 9** http://www.apache.org/licenses/LICENSE-2.0 10** 11** Unless required by applicable law or agreed to in writing, software 12** distributed under the License is distributed on an "AS IS" BASIS, 13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14** See the License for the specific language governing permissions and 15** limitations under the License. 16*/ 17 18#include <keystore/keymaster_tags.h> 19 20namespace keystore { 21 22template<typename TagList> 23struct TagStringifier; 24 25template<typename ... Tags> 26struct TagStringifier<MetaList<Tags...>> { 27 template<TagType tag_type, Tag tag> 28 static TypedTag<tag_type, tag> chooseString(TypedTag<tag_type, tag> ttag, Tag runtime_tag, 29 const char** result) { 30 if (tag == runtime_tag) { 31 *result = Tag2String<tag>::value(); 32 } 33 return ttag; 34 } 35 static const char* stringify(Tag tag) { 36 const char* result = "unknown tag"; 37 [] (Tags&&...) {}(chooseString(Tags(), tag, &result)...); 38 return result; 39 } 40}; 41 42const char* stringifyTag(Tag tag) { 43 return TagStringifier<all_tags_t>::stringify(tag); 44} 45 46} 47