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1 // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 /** |
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17 @file |
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18 @internalTechnology |
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19 */ |
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20 |
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21 #include <elements/metacontainer.h> |
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22 #include <elements/metadata.h> |
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23 |
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24 namespace Meta |
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25 { |
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26 const TInt KContainerUid = 0x10205A04; |
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27 } |
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28 |
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29 using namespace Meta; |
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30 |
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31 |
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32 EXPORT_C RMetaDataContainerBase::RMetaDataContainerBase() |
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33 /** |
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34 * Constructor |
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35 */ |
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36 { |
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37 } |
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38 |
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39 EXPORT_C STypeId RMetaDataContainerBase::GetTypeId() const |
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40 { |
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41 return STypeId::CreateSTypeId( KContainerUid, KNetMetaTypeAny ); |
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42 } |
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43 |
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44 EXPORT_C void RMetaDataContainerBase::Copy(const RMetaDataContainerBase& aMetaContainer) |
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45 /** |
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46 * Copies a content of a meta container into this container. |
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47 * Copies only pointers (does not do a deep copy). |
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48 */ |
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49 { |
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50 TUint count = aMetaContainer.Count(); |
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51 |
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52 for (TUint i = 0; i < count; ++i) |
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53 { |
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54 Append(aMetaContainer[i]); |
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55 } |
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56 } |
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57 |
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58 EXPORT_C TInt RMetaDataContainerBase::Store(TDes8& aDes) const |
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59 /** |
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60 * Stores the content of this container in a descriptor. |
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61 */ |
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62 { |
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63 if (aDes.MaxLength()-aDes.Length() < this->Length()) |
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64 { |
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65 return KErrArgument; |
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66 } |
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67 |
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68 const STypeId& typeId = GetTypeId(); |
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69 aDes.Append((TUint8*)&typeId,sizeof(STypeId)); //store TID |
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70 |
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71 TInt count = Count(); |
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72 TInt length = Length(); |
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73 aDes.Append((TUint8*)&length, sizeof(TInt32)); // Store Length of container |
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74 |
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75 for (TInt i = 0; i < count; ++i) |
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76 { |
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77 SMetaData* element = (*this)[i]; |
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78 if (element) |
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79 { |
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80 TInt ret = element->Store(aDes); //store the object |
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81 if (ret != KErrNone) |
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82 { |
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83 return ret; |
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84 } |
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85 } |
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86 else |
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87 { |
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88 if (aDes.MaxLength() - aDes.Length() < (TInt) sizeof(TUint32)) |
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89 { |
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90 return KErrOverflow; |
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91 } |
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92 const TUint32 KNullInt = 0; |
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93 aDes.Append((TUint8*)&KNullInt, sizeof(TUint32)); |
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94 } |
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95 } |
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96 return KErrNone; |
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97 } |
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98 |
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99 EXPORT_C TInt RMetaDataContainerBase::Load(TPtrC8& aDes) |
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100 /** |
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101 * Loads a content from a descriptor into this container. |
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102 */ |
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103 { |
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104 ResetAndDestroy(); |
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105 TInt32 containerLength; |
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106 Mem::Copy(&containerLength, aDes.Ptr() ,sizeof(TInt32)); |
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107 |
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108 if (containerLength < 0 || (containerLength - sizeof(STypeId))> aDes.Length()) |
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109 { |
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110 // Fatal error, descriptor is corrupt |
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111 return KErrArgument; |
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112 } |
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113 |
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114 // Construct a buffer to work on for this container |
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115 TPtrC8 containerBuffer(aDes.Ptr() + sizeof(TInt32), |
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116 containerLength - sizeof (STypeId) - sizeof (TInt32)); |
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117 |
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118 // Move descriptor pointer past the container buffer |
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119 aDes.Set(aDes.Ptr() + containerLength - sizeof (STypeId), aDes.Length() - containerLength + sizeof (STypeId)); |
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120 |
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121 while (containerBuffer.Length() > 0) |
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122 { |
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123 if (containerBuffer.Length() < (TInt) sizeof(TUint32)) |
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124 { |
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125 return KErrArgument; |
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126 } |
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127 |
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128 // Check for a NULL pointer when stored (First four bytes == 0) |
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129 TUint32 firstFourBytes; |
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130 Mem::Copy(&firstFourBytes, containerBuffer.Ptr(), sizeof(TUint32)); |
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131 if (firstFourBytes == 0) |
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132 { |
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133 // The pointer was NULL when it was stored |
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134 containerBuffer.Set(containerBuffer.Ptr() + sizeof(TUint32), containerBuffer.Length() - sizeof(TUint32)); |
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135 TRAPD(error, AppendL(NULL)); |
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136 if (error != KErrNone) |
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137 { |
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138 return error; |
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139 } |
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140 } |
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141 else |
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142 { |
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143 SMetaData* containerItem = NULL; |
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144 TRAPD(error, containerItem = LoadElementL(containerBuffer)); |
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145 if (error == KErrNone) |
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146 { |
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147 TRAP(error, AppendL(containerItem)); |
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148 } |
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149 if (error != KErrNone && error != KErrNotFound) |
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150 { |
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151 delete containerItem; |
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152 return error; |
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153 } |
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154 } |
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155 } |
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156 return KErrNone; |
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157 } |
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158 |
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159 EXPORT_C TInt RMetaDataContainerBase::Length() const |
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160 /** |
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161 * Returns the length of the content of this container if it was to be stored. |
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162 */ |
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163 { |
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164 TInt length = 0, count = this->Count(); |
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165 for (TInt i = 0; i < count; ++i) |
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166 { |
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167 SMetaData* element = (*this)[i]; |
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168 if (element) |
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169 { |
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170 // UID + Object Type Id + Length Parameter + Length of Data |
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171 length += element->Length(); |
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172 } |
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173 else |
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174 { |
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175 // Add length of null word (Used to represent a NULL pointer) |
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176 length += sizeof(TUint32); |
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177 } |
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178 } |
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179 return length + sizeof(TInt32) + sizeof(STypeId); |
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180 } |
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181 |
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182 |
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183 |