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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/StringBuilder.h>
#include <wtf/text/StringConcatenate.h>
namespace WTF {
enum HexConversionMode { Lowercase, Uppercase };
namespace Internal {
inline const LChar* hexDigitsForMode(HexConversionMode mode)
{
static const LChar lowercaseHexDigits[17] = "0123456789abcdef";
static const LChar uppercaseHexDigits[17] = "0123456789ABCDEF";
return mode == Lowercase ? lowercaseHexDigits : uppercaseHexDigits;
}
WTF_EXPORT_PRIVATE std::pair<LChar*, unsigned> appendHex(LChar* buffer, unsigned bufferSize, std::uintmax_t number, unsigned minimumDigits, HexConversionMode);
template<size_t arraySize, typename NumberType>
inline std::pair<LChar*, unsigned> appendHex(std::array<LChar, arraySize>& buffer, NumberType number, unsigned minimumDigits, HexConversionMode mode)
{
return appendHex(&buffer.front(), buffer.size(), 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;
const LChar* characters() const { return &*(buffer.end() - 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.second;
return buffer;
}
template<typename NumberType> HexNumberBuffer hex(NumberType number, HexConversionMode mode)
{
return hex(number, 0, mode);
}
template<> class StringTypeAdapter<HexNumberBuffer> {
public:
StringTypeAdapter(const HexNumberBuffer& buffer)
: m_buffer { buffer }
{
}
unsigned length() const { return m_buffer.length; }
bool is8Bit() const { return true; }
template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, characters(), length()); }
private:
const LChar* characters() const { return m_buffer.characters(); }
const HexNumberBuffer& m_buffer;
};
class PrintStream;
WTF_EXPORT_PRIVATE void printInternal(PrintStream&, HexNumberBuffer);
} // namespace WTF
using WTF::hex;
using WTF::Lowercase;
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