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// Copyright (c) 2018, 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
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "hex.h"
#include <iterator>
#include <limits>
#include <ostream>
#include <stdexcept>
namespace epee
{
namespace
{
template<typename T>
void write_hex(T&& out, const span<const std::uint8_t> src)
{
static constexpr const char hex[] = u8"0123456789abcdef";
static_assert(sizeof(hex) == 17, "bad string size");
for (const std::uint8_t byte : src)
{
*out = hex[byte >> 4];
++out;
*out = hex[byte & 0x0F];
++out;
}
}
}
std::string to_hex::string(const span<const std::uint8_t> src)
{
if (std::numeric_limits<std::size_t>::max() / 2 < src.size())
throw std::range_error("hex_view::to_string exceeded maximum size");
std::string out{};
out.resize(src.size() * 2);
buffer_unchecked(std::addressof(out[0]), src);
return out;
}
void to_hex::buffer(std::ostream& out, const span<const std::uint8_t> src)
{
write_hex(std::ostreambuf_iterator<char>{out}, src);
}
void to_hex::formatted(std::ostream& out, const span<const std::uint8_t> src)
{
out.put('<');
buffer(out, src);
out.put('>');
}
void to_hex::buffer_unchecked(char* out, const span<const std::uint8_t> src) noexcept
{
return write_hex(out, src);
}
}
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