add hex conv

This commit is contained in:
Green Sky 2024-01-13 22:31:20 +01:00
parent 2b20c2d2a4
commit fa0a09df87
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3 changed files with 66 additions and 0 deletions

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@ -3,6 +3,9 @@ cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
project(solanaceae)
add_library(solanaceae_util
./solanaceae/util/utils.hpp
./solanaceae/util/utils.cpp
./solanaceae/util/config_model.hpp
./solanaceae/util/config_model.inl

53
solanaceae/util/utils.cpp Normal file
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@ -0,0 +1,53 @@
#include "./utils.hpp"
#include <cassert>
namespace detail {
constexpr uint8_t nib_from_hex(char c) {
assert((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'));
if (c >= '0' && c <= '9') {
return static_cast<uint8_t>(c) - '0';
} else if (c >= 'a' && c <= 'f') {
return (static_cast<uint8_t>(c) - 'a') + 10u;
} else {
return 0u;
}
}
constexpr char nib_to_hex(uint8_t c) {
assert(c <= 0x0f);
if (c <= 0x09) {
return c + '0';
} else {
return (c - 10u) + 'a';
}
}
} // detail
std::vector<uint8_t> hex2bin(const std::string& str) {
return hex2bin(std::string_view{str});
}
std::vector<uint8_t> hex2bin(const std::string_view str) {
assert(str.size() % 2 == 0); // TODO: should this be a hard assert??
std::vector<uint8_t> bin{};
bin.resize(str.size()/2, 0);
for (size_t i = 0; i < bin.size(); i++) {
bin[i] = detail::nib_from_hex(str[i*2]) << 4 | detail::nib_from_hex(str[i*2+1]);
}
return bin;
}
std::string bin2hex(const std::vector<uint8_t>& data) {
std::string str;
for (size_t i = 0; i < data.size(); i++) {
str.push_back(detail::nib_to_hex(data[i] >> 4));
str.push_back(detail::nib_to_hex(data[i] & 0x0f));
}
return str;
}

10
solanaceae/util/utils.hpp Normal file
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@ -0,0 +1,10 @@
#pragma once
#include <string>
#include <string_view>
#include <vector>
[[nodiscard]] std::vector<uint8_t> hex2bin(const std::string& str);
[[nodiscard]] std::vector<uint8_t> hex2bin(const std::string_view str);
[[nodiscard]] std::string bin2hex(const std::vector<uint8_t>& bin);