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
20namespace android {
21namespace hardware {
22namespace keymaster {
23namespace V3_0 {
24
25template <typename TagList> struct TagStringifier;
26
27template <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
43const 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