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1 /* |
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2 * Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: NVG Decoder header file |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef CNVGICONDATA_H_ |
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20 #define CNVGICONDATA_H_ |
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21 |
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22 #include <e32base.h> |
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23 #include <s32mem.h> |
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24 |
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25 |
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26 /** |
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27 * @class CNVGIconData |
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28 * This class is useful when you want to read nd write data from and to memory |
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29 * This class check for buffer overflow |
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30 * This is much faster than stream classes provided by symbian |
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31 * During the ETM traces we found that those classes are 3 FPS less than these utility classes |
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32 * This class will be checking for data alignment |
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33 */ |
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34 class CNVGIconData : public CBase |
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35 { |
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36 private: |
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37 CNVGIconData(); |
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38 void ConstructL(TUint aLength); |
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39 void ConstructL(const TDesC8& aBuf); |
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40 |
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41 public: |
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42 |
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43 /** |
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44 * Here the user should only read. Will Behave undefinitly if try to write. |
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45 */ |
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46 static CNVGIconData * NewL(const TDesC8& aBuf); |
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47 |
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48 static CNVGIconData * NewL(TInt aLength = 0); |
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49 |
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50 static CNVGIconData * NewLC(const TDesC8& aBuf); |
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51 |
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52 static CNVGIconData * NewLC(TInt aLength = 0); |
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53 |
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54 static CNVGIconData * NewL(TUint8 * aBuf, TInt aLength); |
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55 |
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56 static CNVGIconData * NewLC(TUint8 * aBuf, TInt aLength); |
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57 |
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58 virtual ~CNVGIconData(); |
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59 |
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60 void Set(const TDesC8& aBuf); |
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61 |
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62 void Set(TUint8 * aBuf, TInt aLength); |
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63 |
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64 TInt EncodeInt8(TUint8 aVal); |
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65 |
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66 TInt EncodeInt16(TUint16 aVal); |
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67 |
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68 TInt EncodeInt32(TUint32 aVal); |
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69 |
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70 TInt EncodeReal32(TReal32 aVal); |
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71 |
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72 TInt EncodeReal64(TReal64 aVal); |
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73 |
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74 TInt EncodeData(const TAny *aData, TUint aLength); |
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75 |
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76 void EncodeInt8L(TUint8 aVal); |
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77 |
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78 void EncodeInt16L(TUint16 aVal); |
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79 |
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80 void EncodeInt32L(TUint32 aVal); |
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81 |
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82 void EncodeReal32L(TReal32 aVal); |
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83 |
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84 void EncodeReal64L(TReal64 aVal); |
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85 |
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86 void EncodeDataL(const TAny *aData, TUint aLength); |
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87 |
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88 TInt ExpandEncodedData(TUint aNewLength); |
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89 |
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90 const HBufC8 * GetNVGData() const; |
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91 |
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92 const HBufC8 * GetNVGData(); |
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93 |
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94 void BeginRead(); |
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95 void EndRead(); |
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96 |
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97 TInt16 ReadInt16L(); |
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98 |
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99 TInt32 ReadInt32L(); |
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100 |
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101 TInt8 ReadInt8L(); |
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102 |
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103 void ReadL(TDes8 &aDes, TInt aLength); |
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104 |
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105 void ReadL(TUint8 *aPtr, TInt aLength); |
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106 |
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107 TReal32 ReadReal32L(); |
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108 |
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109 TReal64 ReadReal64L(); |
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110 |
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111 void SkipL(TInt aLength); |
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112 |
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113 TInt ReadPos(); |
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114 |
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115 TBool EOF(); |
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116 |
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117 TInt DataLength(); |
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118 |
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119 private: |
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120 |
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121 void CheckOutOfBoundL(TInt aLength); |
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122 |
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123 HBufC8 * iNVGData; |
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124 TPtr8 iNVGDataPtr; |
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125 TInt iTotalRead; |
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126 TInt iDataLength; |
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127 TUint8 * iReadStream; |
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128 }; |
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129 |
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130 /** |
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131 * @class TDereferencer |
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132 * This class is useful when you want to dereference character data |
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133 * This class check for buffer overflow |
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134 * This is much faster than stream classes provided by symbian |
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135 * During the ETM traces we found that those classes are 3 FPS less than these utility classes |
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136 * This class won't be checking for data alignment. |
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137 */ |
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138 class TDereferencer |
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139 { |
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140 public: |
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141 |
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142 TDereferencer(TUint8 * aBuf, TInt aLength); |
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143 |
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144 TDereferencer(const TDesC8& aBuf); |
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145 |
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146 /** |
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147 * @fn SkipL |
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148 * Advances the read pointer with the given length |
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149 */void SkipL(TInt aLength); |
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150 |
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151 /** |
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152 * @fn DerefInt16L |
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153 * Converts current position to TInt16 *. The caller should take care of alignment |
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154 * The advantage of this method is that you don't have to copy the data |
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155 * Bound check will happen |
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156 * @param aAt dereference from this position |
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157 * @exception Leaves if data size is not sufficient |
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158 */ |
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159 TInt16 DerefInt16L(TInt aAt = 0); |
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160 operator TInt16(); |
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161 |
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162 /** |
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163 * @fn DerefInt32L |
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164 * Converts current position to TInt32 *. The caller should take care of alignment |
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165 * The advantage of this method is that you don't have to copy the data |
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166 * Bound check will happen |
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167 * @param aAt dereference from this position |
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168 * @exception Leaves if data size is not sufficient |
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169 */ |
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170 TInt32 DerefInt32L(TInt aAt = 0); |
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171 operator TInt32(); |
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172 |
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173 /** |
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174 * @fn DerefInt8L |
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175 * Converts current position to TInt8 *. The caller should take care of alignment |
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176 * The advantage of this method is that you don't have to copy the data |
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177 * Bound check will happen |
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178 * @param aAt dereference from this position |
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179 * @exception Leaves if data size is not sufficient |
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180 */ |
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181 TInt8 DerefInt8L(TInt aAt = 0); |
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182 operator TInt8(); |
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183 |
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184 /** |
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185 * @fn DerefInt8ArrayL |
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186 * Converts current position to TUint8 *. The caller should take care of alignment |
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187 * The advantage of this method is that you don't have to copy the data |
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188 * Bound check will happen |
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189 * @param aLength making safe to dereference for this size |
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190 * @param aAt dereference from this position |
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191 * @exception Leaves if data size is not sufficient |
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192 */ |
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193 TUint8 * DerefInt8ArrayL(TInt aLength, TInt aAt = 0); |
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194 |
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195 /** |
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196 * @fn ReadReal32L |
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197 * Converts current position to TReal32 *. The caller should take care of alignment |
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198 * The advantage of this method is that you don't have to copy the data |
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199 * Bound check will happen |
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200 * @param aAt dereference from this position |
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201 * @exception Leaves if data size is not sufficient |
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202 */ |
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203 TReal32 DerefReal32L(TInt aAt = 0); |
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204 operator TReal32(); |
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205 |
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206 /** |
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207 * @fn ReadReal64L |
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208 * Converts current position to TReal64 *. The caller should take care of alignment |
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209 * The advantage of this method is that you don't have to copy the data |
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210 * Bound check will happen |
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211 * @param aAt dereference from this position |
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212 * @exception Leaves if data size is not sufficient |
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213 */ |
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214 TReal64 DerefReal64L(TInt aAt = 0); |
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215 operator TReal64(); |
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216 |
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217 /** |
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218 * @fn IsSafeL |
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219 * Checks whether dereferencing is safe for the given length from the given offset |
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220 * @param aLength length for dereferencing |
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221 * @param aAt offset from where the dereferencing should start |
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222 */ |
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223 void IsSafeL(TInt aLength, TInt aAt = 0); |
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224 |
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225 /** |
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226 * @fn GetPtr |
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227 * Retrieves the ptr to the data stream |
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228 */ |
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229 TPtr8 GetPtr(); |
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230 |
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231 /** |
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232 * Retrieves the silze of the buffer |
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233 */ |
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234 TInt GetLength(); |
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235 |
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236 /** |
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237 * Returns current reading position |
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238 */ |
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239 TInt GetReadingPos(); |
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240 |
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241 private: |
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242 void CheckOutOfBoundL(TInt aLength); |
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243 |
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244 TInt iTotalRead; |
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245 TInt iDataLength; |
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246 TUint8 * iReadStream; |
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247 }; |
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248 |
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249 #include "NVGIconData.inl" |
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250 |
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251 #endif |