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 "keymaster_tags.h" 19 20 namespace android { 21 namespace hardware { 22 namespace keymaster { 23 namespace V3_0 { 24 25 template <typename TagList> struct TagStringifier; 26 27 template <typename... Tags> struct TagStringifier<MetaList<Tags...>> { 28 template <TagType tag_type, Tag tag> 29 static TypedTag<tag_type, tag> chooseString(TypedTag<tag_type, tag> ttag, Tag runtime_tag, 30 const char** result) { 31 if (tag == runtime_tag) { 32 *result = Tag2String<tag>::value(); 33 } 34 return ttag; 35 } 36 static const char* stringify(Tag tag) { 37 const char* result = "unknown tag"; 38 [](Tags&&...) {}(chooseString(Tags(), tag, &result)...); 39 return result; 40 } 41 }; 42 43 const char* stringifyTag(Tag tag) { 44 return TagStringifier<all_tags_t>::stringify(tag); 45 } 46 47 } // namespace V3_0 48 } // namespace keymaster 49 } // namespace hardware 50 } // namespace android 51
