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1 /* |
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2 * Copyright (c) 2008 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: Active object for buffer aggregation |
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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 // INCLUDE FILES |
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20 #include "MetaDataUtilityBody.h" |
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21 #include "MDUChunkDataObserver.h" |
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22 #include "MetaDataBufferAgg.h" |
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23 |
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24 // CONSTANTS |
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25 // (ID3v2 specification found in www.id3.org) |
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26 // ID3v2 header consists of following parts: |
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27 // - identifier "ID3", 3 bytes |
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28 // - version, 2 bytes |
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29 // - flags, 1 byte |
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30 // - data length, 4 bytes |
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31 const TInt KID3v2HeaderLength = 10; |
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32 const TInt KID3v2TagLength = 3; |
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33 |
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34 _LIT8( KID3v2Tag, "ID3" ); // ID3 metadata format indication |
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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 // CMetaDataBufferAgg::MetaDataBufferAgg |
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40 // C++ default constructor can NOT contain any code, that |
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41 // might leave. |
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42 // ----------------------------------------------------------------------------- |
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43 // |
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44 CMetaDataBufferAgg::CMetaDataBufferAgg( CMetaDataUtilityBody* aBody, |
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45 MMDUChunkDataObserver& aObserver ) |
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46 : CActive( CActive::EPriorityStandard ), |
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47 iBody( aBody ), |
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48 iObserver( aObserver ), |
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49 iState( EFindIdentifier ), |
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50 iUserChunk( NULL ), |
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51 iFinalChunk( EFalse ), |
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52 iMetaDataSize( 0 ) |
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53 { |
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54 CActiveScheduler::Add( this ); |
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55 } |
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56 |
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57 // --------------------------------------------------------------------------- |
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58 // Two-Phase Constructor |
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59 // --------------------------------------------------------------------------- |
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60 // |
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61 CMetaDataBufferAgg* CMetaDataBufferAgg::NewL( CMetaDataUtilityBody* aBody, |
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62 TDesC8& aMimeType, |
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63 MMDUChunkDataObserver& aObserver ) |
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64 { |
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65 CMetaDataBufferAgg* self = new(ELeave) CMetaDataBufferAgg( aBody, aObserver ); |
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66 CleanupStack::PushL( self ); |
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67 self->ConstructL( aMimeType ); |
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68 CleanupStack::Pop( self ); |
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69 return self; |
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70 } |
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71 |
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72 // ----------------------------------------------------------------------------- |
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73 // CMetaDataBufferAgg::Construct() |
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74 // ----------------------------------------------------------------------------- |
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75 // |
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76 void CMetaDataBufferAgg::ConstructL( const TDesC8& aMimeType ) |
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77 { |
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78 // copy MimeType |
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79 iMimeType.CreateL( aMimeType.Size() ); |
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80 iMimeType = aMimeType; |
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81 |
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82 // allocate the buffers |
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83 iPrevBuf.CreateL( 0 ); |
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84 iMetaDataBuf.CreateL ( 0 ); |
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85 |
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86 } |
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87 |
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88 // ----------------------------------------------------------------------------- |
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89 // CMetaDataBufferAgg::~CMetaDataBufferAgg() |
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90 // ----------------------------------------------------------------------------- |
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91 // |
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92 CMetaDataBufferAgg::~CMetaDataBufferAgg() |
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93 { |
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94 iMimeType.Close(); |
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95 iPrevBuf.Close(); |
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96 iMetaDataBuf.Close(); |
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97 Cancel(); |
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98 } |
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99 |
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100 // ----------------------------------------------------------------------------- |
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101 // CMetaDataBufferAgg::RequestProcessChunkData |
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102 // ----------------------------------------------------------------------------- |
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103 // |
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104 TInt CMetaDataBufferAgg::RequestProcessChunkData( TDesC8& aChunk, |
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105 TBool aFinalChunk ) |
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106 { |
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107 if (iState == EParseComplete ) |
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108 { |
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109 return KErrAlreadyExists; |
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110 } |
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111 if (iState == EParseData ) |
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112 { |
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113 return KErrCompletion; |
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114 } |
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115 if ( IsActive() ) |
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116 { |
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117 return KErrNotReady; |
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118 } |
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119 |
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120 iUserChunk = &aChunk; |
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121 iFinalChunk = aFinalChunk; |
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122 |
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123 iStatus = KRequestPending; |
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124 SetActive(); |
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125 |
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126 return KErrNone; |
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127 } |
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128 |
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129 // ----------------------------------------------------------------------------- |
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130 // CMetaDataBufferAgg::RequestParseChunkData |
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131 // ----------------------------------------------------------------------------- |
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132 // |
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133 TInt CMetaDataBufferAgg::RequestParseChunkData() |
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134 { |
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135 if (iState == EParseComplete ) |
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136 { |
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137 return KErrAlreadyExists; |
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138 } |
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139 if ( IsActive() || iState != EParseData) |
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140 { |
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141 return KErrNotReady; |
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142 } |
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143 |
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144 |
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145 iStatus = KRequestPending; |
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146 SetActive(); |
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147 |
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148 return KErrNone; |
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149 } |
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150 |
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151 |
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152 // ----------------------------------------------------------------------------- |
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153 // CMetaDataBufferAgg::ReadyToGo |
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154 // ----------------------------------------------------------------------------- |
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155 // |
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156 void CMetaDataBufferAgg::ReadyToGo() |
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157 { |
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158 TRequestStatus* status = &iStatus; |
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159 User::RequestComplete( status, KErrNone ); |
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160 } |
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161 |
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162 // ----------------------------------------------------------------------------- |
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163 // CMetaDataBufferAgg::DoCancel |
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164 // ----------------------------------------------------------------------------- |
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165 // |
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166 void CMetaDataBufferAgg::DoCancel() |
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167 { |
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168 } |
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169 |
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170 // ----------------------------------------------------------------------------- |
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171 // CMetaDataUtility::RunL |
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172 // ----------------------------------------------------------------------------- |
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173 // |
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174 void CMetaDataBufferAgg::RunL() |
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175 { |
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176 |
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177 switch( iState ) |
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178 { |
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179 case EFindIdentifier: |
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180 { |
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181 TRAPD( err, FindMetaDataIdentifierL( iUserChunk )); |
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182 DoCallback( err ); |
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183 break; |
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184 } |
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185 case ECalculateSize: |
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186 { |
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187 TRAPD( err, CalculateMetaDataSizeL( iUserChunk )); |
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188 DoCallback( err ); |
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189 break; |
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190 } |
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191 case ECollectData: |
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192 { |
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193 TRAPD( err, CollectMetaDataL( iUserChunk )); |
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194 DoCallback( err ); |
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195 break; |
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196 } |
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197 case EParseData: |
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198 { |
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199 TRAPD( err, iBody->DoParseChunkDataL( iMetaDataBuf, iMimeType )); |
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200 iState = EParseComplete; |
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201 DoCallback( err ); |
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202 break; |
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203 } |
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204 default: |
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205 break; |
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206 } |
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207 } |
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208 |
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209 |
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210 // ----------------------------------------------------------------------------- |
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211 // CMetaDataBufferAgg::DoCallback |
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212 // ----------------------------------------------------------------------------- |
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213 // |
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214 void CMetaDataBufferAgg::DoCallback( TInt aError) |
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215 { |
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216 if ( iFinalChunk ) |
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217 { |
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218 switch (iState) |
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219 { |
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220 case EFindIdentifier: |
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221 case ECalculateSize: |
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222 { |
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223 iObserver.HandleChunkDataProcessed( KErrNotFound ); |
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224 break; |
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225 } |
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226 case ECollectData: |
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227 case EParseData: |
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228 { |
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229 iState = EParseData; |
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230 iObserver.HandleChunkDataReadyToBeParsed(); |
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231 break; |
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232 } |
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233 case EParseComplete: |
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234 { |
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235 iObserver.HandleChunkDataComplete( aError ); |
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236 break; |
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237 } |
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238 } |
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239 } |
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240 else |
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241 { |
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242 switch (iState) |
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243 { |
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244 case EFindIdentifier: |
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245 case ECalculateSize: |
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246 case ECollectData: |
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247 { |
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248 iObserver.HandleChunkDataProcessed( KErrNone ); |
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249 break; |
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250 } |
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251 case EParseData: |
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252 { |
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253 iObserver.HandleChunkDataReadyToBeParsed(); |
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254 break; |
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255 } |
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256 case EParseComplete: |
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257 { |
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258 iObserver.HandleChunkDataComplete( aError ); |
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259 break; |
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260 } |
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261 } |
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262 } |
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263 |
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264 } |
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265 |
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266 |
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267 // ----------------------------------------------------------------------------- |
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268 // CMetaDataBufferAgg::FindMetaDataIdentifier |
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269 // ----------------------------------------------------------------------------- |
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270 // |
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271 void CMetaDataBufferAgg::FindMetaDataIdentifierL( TDesC8* aBuf ) |
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272 { |
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273 // search from client buffer first |
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274 TInt offset = aBuf->Find( KID3v2Tag ); |
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275 if ( offset != KErrNotFound ) |
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276 { |
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277 // Identifier is found, copy to iMetaDataBuf |
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278 TUint8* ptr = const_cast<TUint8*>(aBuf->Ptr()); |
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279 CopyBufferL( &iMetaDataBuf, ptr+offset, aBuf->Size() - offset ); |
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280 |
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281 ComputeSize( &iMetaDataBuf, 0 ); |
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282 |
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283 if ( !iMetaDataSize ) |
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284 { |
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285 iState = ECalculateSize; |
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286 } |
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287 else |
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288 { |
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289 if ( iMetaDataBuf.Size() >= iMetaDataSize ) |
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290 { |
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291 iState = EParseData; |
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292 } |
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293 else |
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294 { |
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295 iState = ECollectData; |
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296 } |
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297 } |
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298 } |
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299 else |
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300 { |
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301 // Identifier is NOT found, need to process the previous data |
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302 ProcessPreviousChunkL( aBuf ); |
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303 } |
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304 } |
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305 |
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306 // ----------------------------------------------------------------------------- |
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307 // CMetaDataBufferAgg::FindMetaDataIdentifier |
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308 // ----------------------------------------------------------------------------- |
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309 // |
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310 void CMetaDataBufferAgg::ProcessPreviousChunkL( TDesC8* aBuf ) |
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311 { |
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312 TInt prevSize = iPrevBuf.Size(); |
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313 TInt bufSize = aBuf->Size(); |
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314 TInt sizeToCopy = 0; |
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315 |
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316 //If there is not enough data for 2*KID3v2TagLength |
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317 //The following lists the posibility of the iPrevBuf content: |
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318 // . . . . . . |
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319 // . . . . . I |
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320 // . . . . I D |
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321 // . . I D 3 . |
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322 // or it contains "ID3" at different byte |
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323 if ( prevSize + bufSize < 2*KID3v2TagLength ) |
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324 { |
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325 TUint8* ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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326 |
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327 // just do the append |
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328 AppendBufferL( &iPrevBuf, ptr, bufSize ); |
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329 return; |
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330 } |
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331 else |
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332 { |
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333 sizeToCopy = 2*KID3v2TagLength - prevSize; |
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334 } |
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335 |
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336 //Add into the previous buf (iPrevBuf) |
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337 TUint8* ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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338 AppendBufferL( &iPrevBuf, ptr, sizeToCopy ); |
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339 |
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340 // search from previous buffer |
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341 TInt offset = iPrevBuf.Find( KID3v2Tag ); |
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342 |
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343 // tag IS found |
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344 if ( offset != KErrNotFound ) |
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345 { |
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346 //Found identifier, save previous buf data into iMetaDataBuf |
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347 ptr = const_cast<TUint8*> (iPrevBuf.Ptr()); |
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348 AppendBufferL( &iMetaDataBuf, ptr+offset, iPrevBuf.Size() - offset ); |
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349 |
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350 //Append the rest of aBuf |
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351 ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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352 AppendBufferL( &iMetaDataBuf, ptr+sizeToCopy, aBuf->Size() - sizeToCopy ); |
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353 |
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354 ComputeSize( &iMetaDataBuf, 0 ); |
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355 if ( !iMetaDataSize ) |
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356 { |
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357 iState = ECalculateSize; |
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358 } |
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359 else |
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360 { |
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361 if ( iMetaDataBuf.Size() >= iMetaDataSize ) |
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362 { |
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363 iState = EParseData; |
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364 } |
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365 else |
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366 { |
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367 iState = ECollectData; |
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368 } |
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369 } |
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370 } |
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371 |
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372 // tag NOT found |
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373 else |
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374 { |
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375 //Re-populate iPrevBuf |
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376 if ( aBuf->Size() < KID3v2TagLength ) |
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377 { |
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378 //Append the rest of aBuf into iPrevBuf |
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379 ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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380 AppendBufferL( &iPrevBuf, ptr+sizeToCopy, aBuf->Size() - sizeToCopy ); |
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381 |
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382 //copy the last "KID3v2TagLength" size of aBuf into iPrevBuf |
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383 iPrevBuf = iPrevBuf.Mid(iPrevBuf.Size() - KID3v2TagLength); |
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384 } |
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385 else |
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386 { |
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387 //copy the last "KID3v2TagLength" size of aBuf into iPrevBuf |
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388 offset = aBuf->Size() - KID3v2TagLength; |
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389 TUint8* ptr = const_cast<TUint8*>(aBuf->Ptr()); |
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390 CopyBufferL( &iPrevBuf, ptr+offset, KID3v2TagLength ); |
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391 } |
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392 } |
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393 } |
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394 |
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395 // ----------------------------------------------------------------------------- |
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396 // CMetaDataBufferAgg::CalculateMetaDataSize |
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397 // ----------------------------------------------------------------------------- |
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398 // |
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399 void CMetaDataBufferAgg::CalculateMetaDataSizeL( TDesC8* aBuf ) |
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400 { |
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401 TUint8* ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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402 AppendBufferL( &iMetaDataBuf, ptr, aBuf->Size() ); |
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403 |
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404 // Try to compute the metadata size |
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405 ComputeSize( &iMetaDataBuf, 0 ); |
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406 |
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407 // check whether metadata size is available ( non zero) |
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408 if ( iMetaDataSize ) |
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409 { |
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410 iState = ECollectData; |
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411 } |
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412 |
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413 if ( iMetaDataBuf.Size() >= iMetaDataSize ) |
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414 { |
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415 iState = EParseData; |
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416 } |
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417 } |
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418 |
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419 // ----------------------------------------------------------------------------- |
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420 // CMetaDataBufferAgg::ComputeSize |
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421 // ----------------------------------------------------------------------------- |
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422 // |
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423 void CMetaDataBufferAgg::ComputeSize( TDesC8* aBuf, TInt aOffset ) |
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424 { |
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425 if ( aBuf->Size() < ( aOffset + KID3v2HeaderLength ) ) |
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426 { |
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427 iMetaDataSize = 0; |
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428 return; |
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429 } |
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430 |
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431 // calculate the size |
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432 for ( TInt i = 6; i < 10; i++ ) |
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433 { |
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434 iMetaDataSize <<= 7; |
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435 iMetaDataSize |= (*aBuf)[i+aOffset] & 0x7f; |
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436 } |
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437 iMetaDataSize += KID3v2HeaderLength; // add the header for total size |
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438 |
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439 } |
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440 |
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441 // ----------------------------------------------------------------------------- |
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442 // CMetaDataBufferAgg::CollectMetaData |
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443 // ----------------------------------------------------------------------------- |
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444 // |
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445 void CMetaDataBufferAgg::CollectMetaDataL( TDesC8* aBuf ) |
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446 { |
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447 TUint8* ptr = const_cast<TUint8*> (aBuf->Ptr()); |
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448 AppendBufferL( &iMetaDataBuf, ptr, aBuf->Size() ); |
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449 |
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450 if ( iMetaDataBuf.Size() >= iMetaDataSize ) |
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451 { |
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452 iState = EParseData; |
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453 } |
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454 } |
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455 |
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456 |
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457 // ----------------------------------------------------------------------------- |
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458 // CMetaDataBufferAgg::CopyBufferL |
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459 // ----------------------------------------------------------------------------- |
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460 // |
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461 void CMetaDataBufferAgg::CopyBufferL(RBuf8* aDes, TUint8* aPtr, TInt aSize ) |
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462 { |
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463 if ( aDes->MaxLength() < aSize) |
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464 { |
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465 aDes->ReAllocL( aSize ); |
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466 } |
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467 aDes->Copy( aPtr, aSize ); |
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468 } |
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469 |
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470 |
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471 // ----------------------------------------------------------------------------- |
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472 // CMetaDataBufferAgg::AppendBufferL |
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473 // ----------------------------------------------------------------------------- |
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474 // |
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475 void CMetaDataBufferAgg::AppendBufferL(RBuf8* aDes, TUint8* aPtr, TInt aSize ) |
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476 { |
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477 TInt size = aDes->Size(); |
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478 if ( aDes->MaxLength() < aSize+size) |
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479 { |
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480 aDes->ReAllocL( aSize+size ); |
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481 } |
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482 aDes->Append( aPtr, aSize ); |
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483 } |
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484 |
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485 |