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/*
* Copyright (C) 2011 Research In Motion Limited. 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.
*/
#ifndef HexNumber_h
#define HexNumber_h
#include <wtf/text/StringConcatenate.h>
namespace WTF {
enum HexConversionMode {
Lowercase,
Uppercase
};
namespace Internal {
const char lowerHexDigits[17] = "0123456789abcdef";
const char upperHexDigits[17] = "0123456789ABCDEF";
inline const char* hexDigitsForMode(HexConversionMode mode)
{
return mode == Lowercase ? lowerHexDigits : upperHexDigits;
}
}; // namespace Internal
template<typename T>
inline void appendByteAsHex(unsigned char byte, T& destination, HexConversionMode mode = Uppercase)
{
const char* hexDigits = Internal::hexDigitsForMode(mode);
destination.append(hexDigits[byte >> 4]);
destination.append(hexDigits[byte & 0xF]);
}
template<typename T>
inline void placeByteAsHexCompressIfPossible(unsigned char byte, T& destination, unsigned& index, HexConversionMode mode = Uppercase)
{
const char* hexDigits = Internal::hexDigitsForMode(mode);
if (byte >= 0x10)
destination[index++] = hexDigits[byte >> 4];
destination[index++] = hexDigits[byte & 0xF];
}
template<typename T>
inline void placeByteAsHex(unsigned char byte, T& destination, HexConversionMode mode = Uppercase)
{
const char* hexDigits = Internal::hexDigitsForMode(mode);
*destination++ = hexDigits[byte >> 4];
*destination++ = hexDigits[byte & 0xF];
}
template<typename T>
inline void appendUnsignedAsHex(unsigned number, T& destination, HexConversionMode mode = Uppercase)
{
const char* hexDigits = Internal::hexDigitsForMode(mode);
Vector<UChar, 8> result;
do {
result.prepend(hexDigits[number % 16]);
number >>= 4;
} while (number > 0);
destination.append(result.data(), result.size());
}
// Same as appendUnsignedAsHex, but using exactly 'desiredDigits' for the conversion.
template<typename T>
inline void appendUnsignedAsHexFixedSize(unsigned number, T& destination, unsigned desiredDigits, HexConversionMode mode = Uppercase)
{
ASSERT(desiredDigits);
const char* hexDigits = Internal::hexDigitsForMode(mode);
Vector<UChar, 8> result;
do {
result.prepend(hexDigits[number % 16]);
number >>= 4;
} while (result.size() < desiredDigits);
ASSERT(result.size() == desiredDigits);
destination.append(result.data(), result.size());
}
} // namespace WTF
using WTF::appendByteAsHex;
using WTF::appendUnsignedAsHex;
using WTF::appendUnsignedAsHexFixedSize;
using WTF::placeByteAsHex;
using WTF::placeByteAsHexCompressIfPossible;
using WTF::Lowercase;
#endif // HexNumber_h
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