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39 | |

40 | #ifndef QENDIAN_P_H |

41 | #define QENDIAN_P_H |

42 | |

43 | // |

44 | // W A R N I N G |

45 | // ------------- |

46 | // |

47 | // This file is not part of the Qt API. It exists purely as an |

48 | // implementation detail. This header file may change from version to |

49 | // version without notice, or even be removed. |

50 | // |

51 | // We mean it. |

52 | // |

53 | |

54 | #include <QtCore/qendian.h> |

55 | |

56 | QT_BEGIN_NAMESPACE |

57 | |

58 | // Note if using multiple of these bitfields in a union; the underlying storage type must |

59 | // match. Since we always use an unsigned storage type, unsigned and signed versions may |

60 | // be used together, but different bit-widths may not. |

61 | template<class S, int pos, int width> |

62 | class QSpecialIntegerBitfield |

63 | { |

64 | protected: |

65 | typedef typename S::StorageType T; |

66 | typedef typename std::make_unsigned<T>::type UT; |

67 | |

68 | static Q_DECL_CONSTEXPR UT mask() |

69 | { |

70 | return ((UT(1) << width) - 1) << pos; |

71 | } |

72 | public: |

73 | // FIXME: val is public until qtdeclarative is fixed to not access it directly. |

74 | UT val; |

75 | |

76 | QSpecialIntegerBitfield &operator =(T t) |

77 | { |

78 | UT i = S::fromSpecial(val); |

79 | i &= ~mask(); |

80 | i |= (UT(t) << pos) & mask(); |

81 | val = S::toSpecial(i); |

82 | return *this; |

83 | } |

84 | operator T() const |

85 | { |

86 | if (std::is_signed<T>::value) { |

87 | UT i = S::fromSpecial(val); |

88 | i <<= (sizeof(T) * 8) - width - pos; |

89 | T t = T(i); |

90 | t >>= (sizeof(T) * 8) - width; |

91 | return t; |

92 | } |

93 | return (S::fromSpecial(val) & mask()) >> pos; |

94 | } |

95 | |

96 | bool operator !() const { return !(val & S::toSpecial(mask())); } |

97 | bool operator ==(QSpecialIntegerBitfield<S, pos, width> i) const |

98 | { return ((val ^ i.val) & S::toSpecial(mask())) == 0; } |

99 | bool operator !=(QSpecialIntegerBitfield<S, pos, width> i) const |

100 | { return ((val ^ i.val) & S::toSpecial(mask())) != 0; } |

101 | |

102 | QSpecialIntegerBitfield &operator +=(T i) |

103 | { return (*this = (T(*this) + i)); } |

104 | QSpecialIntegerBitfield &operator -=(T i) |

105 | { return (*this = (T(*this) - i)); } |

106 | QSpecialIntegerBitfield &operator *=(T i) |

107 | { return (*this = (T(*this) * i)); } |

108 | QSpecialIntegerBitfield &operator /=(T i) |

109 | { return (*this = (T(*this) / i)); } |

110 | QSpecialIntegerBitfield &operator %=(T i) |

111 | { return (*this = (T(*this) % i)); } |

112 | QSpecialIntegerBitfield &operator |=(T i) |

113 | { return (*this = (T(*this) | i)); } |

114 | QSpecialIntegerBitfield &operator &=(T i) |

115 | { return (*this = (T(*this) & i)); } |

116 | QSpecialIntegerBitfield &operator ^=(T i) |

117 | { return (*this = (T(*this) ^ i)); } |

118 | QSpecialIntegerBitfield &operator >>=(T i) |

119 | { return (*this = (T(*this) >> i)); } |

120 | QSpecialIntegerBitfield &operator <<=(T i) |

121 | { return (*this = (T(*this) << i)); } |

122 | }; |

123 | |

124 | template<typename T, int pos, int width> |

125 | using QLEIntegerBitfield = QSpecialIntegerBitfield<QLittleEndianStorageType<T>, pos, width>; |

126 | |

127 | template<typename T, int pos, int width> |

128 | using QBEIntegerBitfield = QSpecialIntegerBitfield<QBigEndianStorageType<T>, pos, width>; |

129 | |

130 | template<int pos, int width> |

131 | using qint32_le_bitfield = QLEIntegerBitfield<int, pos, width>; |

132 | template<int pos, int width> |

133 | using quint32_le_bitfield = QLEIntegerBitfield<uint, pos, width>; |

134 | template<int pos, int width> |

135 | using qint32_be_bitfield = QBEIntegerBitfield<int, pos, width>; |

136 | template<int pos, int width> |

137 | using quint32_be_bitfield = QBEIntegerBitfield<uint, pos, width>; |

138 | |

139 | |

140 | QT_END_NAMESPACE |

141 | |

142 | #endif // QENDIAN_P_H |

143 |