98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (C) 2011 Research In Motion Limited. All rights reserved.
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* Copyright (C) 2016-2019 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include <array>
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#include <wtf/text/StringBuilder.h>
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#include <wtf/text/StringConcatenate.h>
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namespace WTF {
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enum HexConversionMode { Lowercase, Uppercase };
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namespace Internal {
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inline const LChar* hexDigitsForMode(HexConversionMode mode)
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{
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static const LChar lowercaseHexDigits[17] = "0123456789abcdef";
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static const LChar uppercaseHexDigits[17] = "0123456789ABCDEF";
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return mode == Lowercase ? lowercaseHexDigits : uppercaseHexDigits;
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}
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WTF_EXPORT_PRIVATE std::pair<LChar*, unsigned> appendHex(LChar* buffer, unsigned bufferSize, std::uintmax_t number, unsigned minimumDigits, HexConversionMode);
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template<size_t arraySize, typename NumberType>
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inline std::pair<LChar*, unsigned> appendHex(std::array<LChar, arraySize>& buffer, NumberType number, unsigned minimumDigits, HexConversionMode mode)
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{
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return appendHex(&buffer.front(), buffer.size(), static_cast<typename std::make_unsigned<NumberType>::type>(number), minimumDigits, mode);
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}
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} // namespace Internal
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struct HexNumberBuffer {
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WTF_MAKE_STRUCT_FAST_ALLOCATED;
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std::array<LChar, 16> buffer;
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unsigned length;
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const LChar* characters() const { return &*(buffer.end() - length); }
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};
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template<typename NumberType> HexNumberBuffer hex(NumberType number, unsigned minimumDigits = 0, HexConversionMode mode = Uppercase)
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{
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// Each byte can generate up to two digits.
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HexNumberBuffer buffer;
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static_assert(sizeof(buffer.buffer) >= sizeof(NumberType) * 2, "number too large for hexNumber");
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auto result = Internal::appendHex(buffer.buffer, number, minimumDigits, mode);
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buffer.length = result.second;
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return buffer;
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}
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template<typename NumberType> HexNumberBuffer hex(NumberType number, HexConversionMode mode)
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{
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return hex(number, 0, mode);
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}
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template<> class StringTypeAdapter<HexNumberBuffer> {
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public:
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StringTypeAdapter(const HexNumberBuffer& buffer)
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: m_buffer { buffer }
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{
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}
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unsigned length() const { return m_buffer.length; }
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bool is8Bit() const { return true; }
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template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, characters(), length()); }
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private:
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const LChar* characters() const { return m_buffer.characters(); }
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const HexNumberBuffer& m_buffer;
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};
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class PrintStream;
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WTF_EXPORT_PRIVATE void printInternal(PrintStream&, HexNumberBuffer);
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} // namespace WTF
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using WTF::hex;
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using WTF::Lowercase;
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