third_party/WebKit/Source/wtf/HexNumber.h

   1 /*
   2  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifndef HexNumber_h
  21 #define HexNumber_h
  22
  23 #include "wtf/text/StringConcatenate.h"
  24
  25 namespace WTF {
  26
  27 enum HexConversionMode {
  28     Lowercase,
  29     Uppercase
  30 };
  31
  32 namespace Internal {
  33
  34 const LChar lowerHexDigits[17] = "0123456789abcdef";
  35 const LChar upperHexDigits[17] = "0123456789ABCDEF";
  36 inline const LChar* hexDigitsForMode(HexConversionMode mode)
  37 {
  38     return mode == Lowercase ? lowerHexDigits : upperHexDigits;
  39 }
  40
  41 } // namespace Internal
  42
  43 template<typename T>
  44 inline void appendByteAsHex(unsigned char byte, T& destination, HexConversionMode mode = Uppercase)
  45 {
  46     const LChar* hexDigits = Internal::hexDigitsForMode(mode);
  47     destination.append(hexDigits[byte >> 4]);
  48     destination.append(hexDigits[byte & 0xF]);
  49 }
  50
  51 template<typename T>
  52 inline void placeByteAsHexCompressIfPossible(unsigned char byte, T& destination, unsigned& index, HexConversionMode mode = Uppercase)
  53 {
  54     const LChar* hexDigits = Internal::hexDigitsForMode(mode);
  55     if (byte >= 0x10)
  56         destination[index++] = hexDigits[byte >> 4];
  57     destination[index++] = hexDigits[byte & 0xF];
  58 }
  59
  60 template<typename T>
  61 inline void placeByteAsHex(unsigned char byte, T& destination, HexConversionMode mode = Uppercase)
  62 {
  63     const LChar* hexDigits = Internal::hexDigitsForMode(mode);
  64     *destination++ = hexDigits[byte >> 4];
  65     *destination++ = hexDigits[byte & 0xF];
  66 }
  67
  68 template<typename T>
  69 inline void appendUnsignedAsHex(unsigned number, T& destination, HexConversionMode mode = Uppercase)
  70 {
  71     const LChar* hexDigits = Internal::hexDigitsForMode(mode);
  72     Vector<LChar, 8> result;
  73     do {
  74         result.prepend(hexDigits[number % 16]);
  75         number >>= 4;
  76     } while (number > 0);
  77
  78     destination.append(result.data(), result.size());
  79 }
  80
  81 // Same as appendUnsignedAsHex, but using exactly 'desiredDigits' for the conversion.
  82 template<typename T>
  83 inline void appendUnsignedAsHexFixedSize(unsigned number, T& destination, unsigned desiredDigits, HexConversionMode mode = Uppercase)
  84 {
  85     ASSERT(desiredDigits);
  86
  87     const LChar* hexDigits = Internal::hexDigitsForMode(mode);
  88     Vector<LChar, 8> result;
  89     do {
  90         result.prepend(hexDigits[number % 16]);
  91         number >>= 4;
  92     } while (result.size() < desiredDigits);
  93
  94     ASSERT(result.size() == desiredDigits);
  95     destination.append(result.data(), result.size());
  96 }
  97
  98 } // namespace WTF
  99
 100 using WTF::appendByteAsHex;
 101 using WTF::appendUnsignedAsHex;
 102 using WTF::appendUnsignedAsHexFixedSize;
 103 using WTF::placeByteAsHex;
 104 using WTF::placeByteAsHexCompressIfPossible;
 105 using WTF::Lowercase;
 106
 107 #endif // HexNumber_h