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