// Copyright (c) 2017-2023, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <array>
#include <cstdint>
#include <iosfwd>
#include <string>
#include <boost/utility/string_ref.hpp>
#include "wipeable_string.h"
#include "span.h"
namespace epee
{
struct to_hex
{
//! \return A std::string containing hex of `src`.
static std::string string(const span<const std::uint8_t> src);
//! \return A epee::wipeable_string containing hex of `src`.
static epee::wipeable_string wipeable_string(const span<const std::uint8_t> src);
template<typename T> static epee::wipeable_string wipeable_string(const T &pod) { return wipeable_string(span<const uint8_t>((const uint8_t*)&pod, sizeof(pod))); }
//! \return An array containing hex of `src`.
template<std::size_t N>
static std::array<char, N * 2> array(const std::array<std::uint8_t, N>& src) noexcept
{
std::array<char, N * 2> out;
static_assert(N <= 128, "keep the stack size down");
buffer_unchecked(out.data(), {src.data(), src.size()});
return out;
}
//! \return An array containing hex of `src`.
template<typename T>
static std::array<char, sizeof(T) * 2> array(const T& src) noexcept
{
std::array<char, sizeof(T) * 2> out;
static_assert(sizeof(T) <= 128, "keep the stack size down");
buffer_unchecked(out.data(), as_byte_span(src));
return out;
}
//! Write `src` as hex to `out`. `out` must be exactly 2x in size.
static bool buffer(span<char> out, const span<const std::uint8_t> src) noexcept;
//! Append `src` as hex to `out`.
static void buffer(std::ostream& out, const span<const std::uint8_t> src);
//! Append `< + src + >` as hex to `out`.
static void formatted(std::ostream& out, const span<const std::uint8_t> src);
private:
template<typename T> T static convert(const span<const std::uint8_t> src);
//! Write `src` bytes as hex to `out`. `out` must be twice the length
static void buffer_unchecked(char* out, const span<const std::uint8_t> src) noexcept;
};
//! Convert hex in UTF8 encoding to binary
struct from_hex
{
static bool to_string(std::string& out, boost::string_ref src);
static bool to_buffer(span<std::uint8_t> out, boost::string_ref src) noexcept;
private:
static bool to_buffer_unchecked(std::uint8_t* out, boost::string_ref src) noexcept;
};
//! Convert hex in current C locale encoding to binary
struct from_hex_locale
{
static std::vector<uint8_t> to_vector(boost::string_ref src);
};
}
