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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtDeclarative module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #ifndef QBITFIELD_P_H |
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43 #define QBITFIELD_P_H |
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44 |
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45 // |
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46 // W A R N I N G |
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47 // ------------- |
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48 // |
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49 // This file is not part of the Qt API. It exists purely as an |
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50 // implementation detail. This header file may change from version to |
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51 // version without notice, or even be removed. |
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52 // |
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53 // We mean it. |
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54 // |
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55 |
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56 #include <QtCore/qglobal.h> |
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57 |
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58 QT_BEGIN_NAMESPACE |
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59 |
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60 class QBitField |
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61 { |
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62 public: |
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63 inline QBitField(); |
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64 inline QBitField(const quint32 *, int bits); |
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65 inline QBitField(const QBitField &); |
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66 inline ~QBitField(); |
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67 |
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68 inline QBitField &operator=(const QBitField &); |
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69 |
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70 inline quint32 size() const; |
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71 inline QBitField united(const QBitField &); |
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72 inline bool testBit(int) const; |
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73 |
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74 private: |
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75 quint32 bits:31; |
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76 quint32 *ownData; |
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77 const quint32 *data; |
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78 }; |
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79 |
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80 QBitField::QBitField() |
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81 : bits(0), ownData(0), data(0) |
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82 { |
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83 } |
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84 |
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85 QBitField::QBitField(const quint32 *bitData, int bitCount) |
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86 : bits((quint32)bitCount), ownData(0), data(bitData) |
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87 { |
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88 } |
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89 |
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90 QBitField::QBitField(const QBitField &other) |
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91 : bits(other.bits), ownData(other.ownData), data(other.data) |
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92 { |
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93 if (ownData) |
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94 ++(*ownData); |
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95 } |
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96 |
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97 QBitField::~QBitField() |
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98 { |
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99 if (ownData) |
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100 if(0 == --(*ownData)) delete [] ownData; |
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101 } |
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102 |
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103 QBitField &QBitField::operator=(const QBitField &other) |
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104 { |
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105 if (other.data == data) |
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106 return *this; |
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107 |
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108 if (ownData) |
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109 if(0 == --(*ownData)) delete [] ownData; |
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110 |
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111 bits = other.bits; |
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112 ownData = other.ownData; |
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113 data = other.data; |
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114 |
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115 if (ownData) |
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116 ++(*ownData); |
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117 |
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118 return *this; |
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119 } |
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120 |
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121 inline quint32 QBitField::size() const |
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122 { |
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123 return bits; |
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124 } |
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125 |
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126 QBitField QBitField::united(const QBitField &o) |
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127 { |
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128 if (o.bits == 0) { |
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129 return *this; |
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130 } else if (bits == 0) { |
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131 return o; |
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132 } else { |
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133 int max = (bits > o.bits)?bits:o.bits; |
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134 int length = (max + 31) / 32; |
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135 QBitField rv; |
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136 rv.bits = max; |
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137 rv.ownData = new quint32[length + 1]; |
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138 *(rv.ownData) = 1; |
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139 rv.data = rv.ownData + 1; |
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140 if (bits > o.bits) { |
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141 ::memcpy((quint32 *)rv.data, data, length * sizeof(quint32)); |
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142 for (quint32 ii = 0; ii < (o.bits + quint32(31)) / 32; ++ii) |
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143 ((quint32 *)rv.data)[ii] |= o.data[ii]; |
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144 } else { |
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145 ::memcpy((quint32 *)rv.data, o.data, length * sizeof(quint32)); |
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146 for (quint32 ii = 0; ii < (bits + quint32(31)) / 32; ++ii) |
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147 ((quint32 *)rv.data)[ii] |= data[ii]; |
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148 } |
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149 return rv; |
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150 } |
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151 } |
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152 |
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153 bool QBitField::testBit(int b) const |
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154 { |
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155 Q_ASSERT(b >= 0); |
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156 if ((quint32)b < bits) { |
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157 return data[b / 32] & (1 << (b % 32)); |
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158 } else { |
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159 return false; |
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160 } |
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161 } |
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162 |
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163 QT_END_NAMESPACE |
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164 |
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165 #endif // QBITFIELD_P_H |