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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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6 ** |
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7 ** This file is part of the HbCore module of the UI Extensions for Mobile. |
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8 ** |
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9 ** GNU Lesser General Public License Usage |
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10 ** This file may be used under the terms of the GNU Lesser General Public |
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11 ** License version 2.1 as published by the Free Software Foundation and |
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12 ** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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13 ** Please review the following information to ensure the GNU Lesser General |
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14 ** Public License version 2.1 requirements will be met: |
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15 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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16 ** |
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17 ** In addition, as a special exception, Nokia gives you certain additional |
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18 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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19 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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20 ** |
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21 ** If you have questions regarding the use of this file, please contact |
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22 ** Nokia at developer.feedback@nokia.com. |
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23 ** |
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24 ****************************************************************************/ |
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25 |
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26 #ifndef HB_DEREFERENCER_P_H |
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27 #define HB_DEREFERENCER_P_H |
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28 |
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29 #include <QByteArray> |
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30 #include <QtGlobal> |
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31 |
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32 #include "hbnvg_p.h" |
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33 #include "hbnvgexception_p.h" |
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34 |
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35 class HbDereferencer |
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36 { |
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37 #define DEREF_PTR(TOTYPE, Offset, Size) do {\ |
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38 checkOutOfBound(Offset + Size); \ |
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39 return * (TOTYPE *)&mReadStream[mTotalRead + Offset];\ |
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40 } while (0) |
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41 public: |
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42 |
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43 HbDereferencer(quint8* buf, qint32 length) |
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44 : mTotalRead(0), |
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45 mDataLength(length), |
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46 mReadStream((unsigned char*)buf) |
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47 { |
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48 } |
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49 |
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50 HbDereferencer(const QByteArray& buffer) |
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51 : mTotalRead(0), |
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52 mDataLength(buffer.length()), |
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53 mReadStream((unsigned char*)buffer.data()) |
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54 { |
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55 } |
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56 |
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57 void skip(qint32 length) |
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58 { |
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59 checkOutOfBound(length); |
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60 mTotalRead += length; |
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61 } |
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62 |
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63 qint16 derefInt16(qint16 at = 0) |
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64 { |
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65 DEREF_PTR(qint16, at, sizeof(qint16)); |
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66 } |
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67 operator qint16() |
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68 { |
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69 return derefInt16(); |
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70 } |
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71 |
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72 qint32 derefInt32(qint32 at = 0) |
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73 { |
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74 DEREF_PTR(qint32, at, sizeof(qint32)); |
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75 } |
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76 |
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77 operator qint32() |
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78 { |
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79 return derefInt32(); |
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80 } |
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81 |
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82 qint8 derefInt8(qint32 at = 0) |
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83 { |
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84 DEREF_PTR(qint8, at, sizeof(qint8)); |
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85 } |
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86 |
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87 operator qint8() |
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88 { |
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89 return derefInt8(); |
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90 } |
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91 |
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92 quint8* derefInt8Array(qint32 length, qint32 at = 0) |
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93 { |
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94 checkOutOfBound(at + length); |
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95 return (quint8 *)&mReadStream[mTotalRead + at]; |
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96 } |
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97 |
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98 float derefReal32(qint32 at = 0) |
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99 { |
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100 DEREF_PTR(float, at, sizeof(float)); |
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101 } |
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102 operator float() |
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103 { |
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104 return derefReal32(); |
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105 } |
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106 |
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107 void assertBound(qint32 length, qint32 at = 0) |
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108 { |
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109 checkOutOfBound(at + length); |
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110 } |
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111 |
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112 quint8* getPtr() const |
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113 { |
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114 return mReadStream; |
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115 } |
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116 |
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117 qint32 getLength() const |
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118 { |
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119 return mDataLength; |
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120 } |
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121 |
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122 qint32 getReadingPos() const |
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123 { |
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124 return mTotalRead; |
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125 } |
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126 |
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127 private: |
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128 void checkOutOfBound(qint32 length) |
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129 { |
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130 if (mTotalRead + length > mDataLength || |
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131 mTotalRead + length < 0){ |
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132 throw HbNvgException(HbNvgEngine::NvgErrEof); |
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133 } |
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134 } |
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135 |
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136 qint32 mTotalRead; |
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137 qint32 mDataLength; |
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138 quint8* mReadStream; |
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139 }; |
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140 |
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141 #endif |
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142 |