blob: 5cca094a91352334e92f5c36fc46b73c00cd096c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_UTILS_CPP_HEX_STRING_HPP
#define INCLUDED_SRC_UTILS_CPP_HEX_STRING_HPP
#include <algorithm>
#include <cctype>
#include <cstddef>
#include <iomanip>
#include <iostream>
#include <optional>
#include <sstream>
#include <string>
[[nodiscard]] static inline auto IsHexString(std::string const& s) noexcept
-> bool {
return std::all_of(
s.begin(), s.end(), [](unsigned char c) { return std::isxdigit(c); });
}
[[nodiscard]] static inline auto ToHexString(std::string const& bytes)
-> std::string {
std::ostringstream ss{};
ss << std::hex << std::setfill('0');
for (auto const& b : bytes) {
ss << std::setw(2)
<< static_cast<int>(static_cast<unsigned char const>(b));
}
return ss.str();
}
[[nodiscard]] static inline auto FromHexString(std::string const& hexstring)
-> std::optional<std::string> {
try {
static constexpr std::size_t kHexBase = 16;
std::stringstream ss{};
for (std::size_t i = 0; i < hexstring.length(); i += 2) {
unsigned char c =
std::stoul(hexstring.substr(i, 2), nullptr, kHexBase);
ss << c;
}
return ss.str();
} catch (...) {
return std::nullopt;
}
}
#endif // INCLUDED_SRC_UTILS_CPP_HEX_STRING_HPP
|
