94 lines
3.3 KiB
C++
94 lines
3.3 KiB
C++
#include <limits>
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#include <stdexcept>
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#include <base/baseN.hpp>
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#include <base/hex.hpp>
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static const char hexdigits[] = "0123456789abcdef";
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static const int8_t hexmap[] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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//
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};
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namespace hex
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{
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bool isValid(const char *str, uint64_t str_size) noexcept
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{
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return baseN::isValid(str, str_size, hexmap);
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}
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bool isValid(std::string_view str) noexcept
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{
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return baseN::isValid(str, hexmap);
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}
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uint64_t sizeEncoded(uint64_t data_size)
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{
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if (data_size > std::numeric_limits<uint64_t>::max() / 2)
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{
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throw std::overflow_error("hex::sizeEncoded: overflow");
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}
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return data_size * 2;
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}
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uint64_t sizeDecoded(uint64_t str_size) noexcept
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{
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return str_size / 2;
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}
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void encode(const uint8_t *data, uint64_t data_size, char *str, uint64_t str_size)
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{
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if (str_size < hex::sizeEncoded(data_size))
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{
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throw std::logic_error("hex::encode: not enough allocated length");
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}
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for (uint64_t i = 0; i < data_size; i++)
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{
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str[i * 2] = hexdigits[data[i] >> 4];
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str[i * 2 + 1] = hexdigits[data[i] & 0x0F];
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}
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}
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std::string encode(std::span<const uint8_t> data) noexcept
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{
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std::string str(hex::sizeEncoded(data.size()), ' ');
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hex::encode(data.data(), data.size(), str.data(), str.size());
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return str;
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}
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void decode(const char *str, uint64_t str_size, uint8_t *data, uint64_t data_size)
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{
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if (str_size % 2 != 0)
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{
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throw std::logic_error("hex::decode: isn't hex");
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}
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if (data_size < hex::sizeDecoded(str_size))
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{
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throw std::logic_error("hex::decode: not enough allocated length");
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}
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if (!hex::isValid(str, str_size))
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{
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throw std::logic_error("hex::decode: out of digits map");
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}
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for (uint64_t i = 0; i * 2 < str_size; i++)
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{
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data[i] = hexmap[(int8_t)str[i * 2]] << 4 | hexmap[(int8_t)str[i * 2 + 1]];
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}
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}
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std::vector<uint8_t> decode(std::string_view str) noexcept
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{
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std::vector<uint8_t> data(hex::sizeDecoded(str.size()));
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hex::decode(str.data(), str.size(), data.data(), data.size());
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return data;
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}
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} |