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