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
20 namespace keystore {
21
22 template<typename TagList>
23 struct TagStringifier;
24
25 template<typename ... Tags>
26 struct TagStringifier<MetaList<Tags...>> {
27 template<TagType tag_type, Tag tag>
chooseStringkeystore::TagStringifier28 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 }
stringifykeystore::TagStringifier35 static const char* stringify(Tag tag) {
36 const char* result = "unknown tag";
37 [] (Tags&&...) {}(chooseString(Tags(), tag, &result)...);
38 return result;
39 }
40 };
41
stringifyTag(Tag tag)42 const char* stringifyTag(Tag tag) {
43 return TagStringifier<all_tags_t>::stringify(tag);
44 }
45
46 }
47