1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "tlv.h"
18
19 #include <android-base/logging.h>
20
21 namespace android::hardware::radio::minimal::sim {
22
makeTlv(uint32_t tag,std::span<uint8_t const> value)23 std::vector<uint8_t> makeTlv(uint32_t tag, std::span<uint8_t const> value) {
24 // If needed, implement ISO 7816 5.2.2.1
25 CHECK(tag <= 0xFFFF) << "3-byte tag numbers (" << tag << ") are not implemented";
26
27 // If we end up needing more, implement ISO 7816 5.2.2.2
28 CHECK(value.size() <= 0x7F) << "Large tag lengths are not implemented: " << value.size()
29 << " for " << tag;
30
31 std::vector<uint8_t> serialized;
32 if (tag <= 0xFF) {
33 serialized = {static_cast<uint8_t>(tag), static_cast<uint8_t>(value.size())};
34 } else {
35 serialized = {static_cast<uint8_t>(tag >> 8), static_cast<uint8_t>(tag & 0xFF),
36 static_cast<uint8_t>(value.size())};
37 }
38
39 serialized.insert(serialized.end(), value.begin(), value.end());
40 return serialized;
41 }
42
43 namespace tlv_operators {
44
operator +(std::span<uint8_t const> a,std::span<uint8_t const> b)45 std::vector<uint8_t> operator+(std::span<uint8_t const> a, std::span<uint8_t const> b) {
46 std::vector<uint8_t> concatenated;
47 concatenated.insert(concatenated.end(), a.begin(), a.end());
48 concatenated.insert(concatenated.end(), b.begin(), b.end());
49 return concatenated;
50 }
51
52 } // namespace tlv_operators
53
54 } // namespace android::hardware::radio::minimal::sim
55