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/*
* Copyright (C) 2011 Research In Motion Limited. All rights reserved.
* Copyright (C) 2016-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include <array>
#include <wtf/text/StringImpl.h>
namespace WTF {
enum HexConversionMode { Lowercase, Uppercase };
namespace Internal {
inline const std::array<LChar, 16>& hexDigitsForMode(HexConversionMode mode)
{
static constexpr std::array<LChar, 16> lowercaseHexDigits { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
static constexpr std::array<LChar, 16> uppercaseHexDigits { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
return mode == Lowercase ? lowercaseHexDigits : uppercaseHexDigits;
}
WTF_EXPORT_PRIVATE std::span<LChar> appendHex(std::span<LChar> buffer, std::uintmax_t number, unsigned minimumDigits, HexConversionMode);
template<size_t arraySize, typename NumberType>
inline std::span<LChar> appendHex(std::array<LChar, arraySize>& buffer, NumberType number, unsigned minimumDigits, HexConversionMode mode)
{
return appendHex(std::span<LChar> { buffer }, static_cast<typename std::make_unsigned<NumberType>::type>(number), minimumDigits, mode);
}
} // namespace Internal
struct HexNumberBuffer {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
std::array<LChar, 16> buffer;
unsigned length;
std::span<const LChar> span() const LIFETIME_BOUND { return std::span { buffer }.last(length); }
};
template<typename NumberType> HexNumberBuffer hex(NumberType number, unsigned minimumDigits = 0, HexConversionMode mode = Uppercase)
{
// Each byte can generate up to two digits.
HexNumberBuffer buffer;
static_assert(sizeof(buffer.buffer) >= sizeof(NumberType) * 2, "number too large for hexNumber");
auto result = Internal::appendHex(buffer.buffer, number, minimumDigits, mode);
buffer.length = result.size();
return buffer;
}
template<typename NumberType> HexNumberBuffer hex(NumberType number, HexConversionMode mode)
{
return hex(number, 0, mode);
}
template<> class StringTypeAdapter<HexNumberBuffer> {
public:
explicit StringTypeAdapter(const HexNumberBuffer& buffer)
: m_buffer { buffer }
{
}
unsigned length() const { return m_buffer.length; }
bool is8Bit() const { return true; }
template<typename CharacterType> void writeTo(std::span<CharacterType> destination) const { StringImpl::copyCharacters(destination, m_buffer.span()); }
private:
const HexNumberBuffer& m_buffer;
};
WTF_EXPORT_PRIVATE CString toHexCString(std::span<const uint8_t>);
WTF_EXPORT_PRIVATE String toHexString(std::span<const uint8_t>);
class PrintStream;
WTF_EXPORT_PRIVATE void printInternal(PrintStream&, HexNumberBuffer);
} // namespace WTF
using WTF::hex;
using WTF::toHexCString;
using WTF::toHexString;
using WTF::Lowercase;
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