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1 // Copyright (c) 2006-2009 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 #include "mmruf.h" |
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17 #include <e32uid.h> |
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18 |
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19 #include "constants.h" |
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20 #include "parsers.h" |
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21 |
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22 #ifdef _DEBUG |
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23 _LIT(KRUFPanic, "MMRUF"); |
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24 static const TInt KReasonNoFunction = 1; |
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25 #endif |
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26 |
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27 // |
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28 // A table of recognised file formats. |
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29 // It should be sorted in order of format popularity. |
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30 // |
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31 static const TSignature KSigs[] = |
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32 { |
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33 CUSTOM_SIG(KMimeAAC, TAACParser::DoRecognise), |
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34 CUSTOM_SIG(KMimeMP3, TMP3Parser::DoRecognise), |
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35 CUSTOM_SIG(KMimeMP4_V, TMPEG4Parser::DoRecognise), |
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36 CUSTOM_SIG(KMimeWMV, TASFParser::DoRecognise), |
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37 CUSTOM_SIG(KMimeMPEG2_V, TMPEG2Parser::DoRecognise), |
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38 CUSTOM_SIG(KMimeRM_V, TRMParser::DoRecognise), |
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39 CUSTOM_SIG(KMimeRAM, TRAMParser::DoRecognise), |
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40 CUSTOM_SIG(KMimeSDP, TSDPParser::DoRecognise), |
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41 CUSTOM_SIG(KMimeXPS, TXPSParser::DoRecognise), |
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42 HEADER_SIG(KMimeRA, KExtRA, KSigRA), |
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43 HEADER_SIG(KMimeAIFF, KExtAIFF_1, KSigAIFF), |
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44 HEADER_SIG(KMimeAIFF, KExtAIFF_2, KSigAIFF), |
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45 HEADER_SIG(KMimeAIFF, KExtAIFF_3, KSigAIFF), |
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46 HEADER_SIG(KMimeAMR, KExtAMR, KSigAMR_1), |
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47 HEADER_SIG(KMimeAMR, KExtAMR, KSigAMR_2), |
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48 HEADER_SIG(KMimeAMRWB, KExtAMRWB, KSigAMRWB_1), |
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49 HEADER_SIG(KMimeAMRWB, KExtAMRWB, KSigAMRWB_2), |
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50 HEADER_SIG(KMimeAU, KExtAU, KSigAU), |
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51 HEADER_SIG(KMimeAVI, KExtAVI, KSigAVI), |
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52 HEADER_SIG(KMimeDIVX, KExtDIVX, KSigDIVX_1), |
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53 HEADER_SIG(KMimeDIVX, KExtDIVX, KSigDIVX_2), |
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54 HEADER_SIG(KMimeDLS, KExtDLS, KSigDLS), |
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55 HEADER_SIG(KMimeFLAC, KExtFLAC_1, KSigFLAC), |
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56 HEADER_SIG(KMimeFLAC, KExtFLAC_2, KSigFLAC), |
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57 HEADER_SIG(KMimeGSM, KExtGSM, KSigGSM), |
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58 HEADER_SIG(KMimeM3U, KExtM3U, KSigM3U), |
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59 HEADER_SIG(KMimeMID, KExtMID, KSigMID), |
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60 HEADER_SIG(KMimeMLD, KExtMLD, KSigMLD), |
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61 HEADER_SIG(KMimeMMF, KExtMMF, KSigMMF), |
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62 HEADER_SIG(KMimeMXMF, KExtMXMF, KSigMXMF), |
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63 HEADER_SIG(KMimeOGG, KExtOGG, KSigOGG), |
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64 HEADER_SIG(KMimeBeatnikRMF, KExtBeatnikRMF, KSigBeatnikRMF), |
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65 HEADER_SIG(KMimeSMF, KExtSMF, KSigSMF), |
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66 HEADER_SIG(KMimeSND, KExtSND, KSigSND), |
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67 HEADER_SIG(KMimeWAV, KExtWAV, KSigWAV_1), |
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68 HEADER_SIG(KMimeWAV, KExtWAV, KSigWAV_2), |
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69 HEADER_SIG(KMimeXMF, KExtXMF, KSigXMF), |
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70 CUSTOM_SIG(KMimeMAT_V, TMatroskaParser::DoRecognise), |
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71 }; |
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72 |
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73 static const TInt KDataTypesCount = sizeof(KSigs) / sizeof(TSignature); |
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74 |
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75 // |
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76 // Map all combinations of [ext_match][header_match] to confidence levels. |
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77 // |
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78 static const TInt KResultToConfidence[] = |
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79 { |
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80 KConfNotRecognised, |
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81 KConfProbable, |
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82 KConfPossible, |
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83 KConfCertain |
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84 }; |
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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 const TImplementationProxy ImplementationTable[] = |
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90 { |
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91 // UID taken from Multimedia's UID allocation table. |
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92 IMPLEMENTATION_PROXY_ENTRY(KRecogniserUID, CMMRUF::NewL) |
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93 }; |
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94 |
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95 |
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96 // |
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97 // |
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98 // |
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99 EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount) |
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100 { |
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101 aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy); |
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102 return ImplementationTable; |
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103 } |
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104 |
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105 |
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106 // |
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107 // |
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108 // |
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109 CMMRUF::CMMRUF() |
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110 : CApaDataRecognizerType(KMMRUFDLLUid, KRecogniserPriority) |
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111 { |
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112 iCountDataTypes = KDataTypesCount; |
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113 } |
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114 |
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115 |
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116 // |
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117 // |
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118 // |
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119 CMMRUF* CMMRUF::NewL() |
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120 { |
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121 return new(ELeave)CMMRUF(); |
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122 } |
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123 |
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124 |
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125 // |
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126 // |
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127 // |
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128 CMMRUF::~CMMRUF() |
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129 { |
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130 } |
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131 |
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132 |
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133 // |
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134 // |
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135 // |
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136 TUint CMMRUF::PreferredBufSize() |
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137 { |
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138 return KPreferredBufSize; |
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139 } |
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140 |
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141 |
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142 // |
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143 // Required for CApaDataRecognizerType parent class. |
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144 // It creates a mime-type string for the signature at aIndex. |
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145 // |
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146 TDataType CMMRUF::SupportedDataTypeL(TInt aIndex) const |
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147 { |
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148 if ((aIndex < 0) || (aIndex >= KDataTypesCount)) |
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149 { |
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150 User::Leave(KErrArgument); |
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151 } |
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152 |
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153 return SupportedDataTypeL(KSigs[aIndex].iMime); |
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154 } |
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155 |
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156 |
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157 // |
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158 // |
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159 // |
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160 TDataType CMMRUF::SupportedDataTypeL(const TText8* aMime) const |
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161 { |
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162 if (aMime == NULL) |
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163 { |
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164 User::Leave(KErrArgument); |
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165 } |
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166 |
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167 return TDataType(TPtrC8(aMime)); |
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168 } |
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169 |
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170 |
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171 // |
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172 // Records the matched data type and the confidence. |
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173 // |
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174 void CMMRUF::SetDataTypeL(TInt aConfidence, const TText8* aMime) |
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175 { |
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176 iDataType = SupportedDataTypeL(aMime); |
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177 iConfidence = aConfidence; |
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178 } |
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179 |
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180 |
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181 // |
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182 // Utility function for matching file extensions. |
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183 // Returns 1 if the extensions match, 0 otherwise. |
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184 // |
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185 TUint8 CMMRUF::MatchExtension(const TDesC& aFileExt, const TText* aKnownExt) const |
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186 { |
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187 if (aFileExt.Length() > 0) |
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188 { |
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189 return ((aFileExt.MatchF(TPtrC(aKnownExt)) != KErrNotFound) ? 1 : 0); |
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190 } |
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191 |
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192 return 0; |
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193 } |
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194 |
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195 |
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196 // |
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197 // Utility function for matching known header data. |
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198 // Returns 1 if the buffer contents match the header, 0 otherwise. |
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199 // |
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200 TUint8 CMMRUF::MatchHeader(const TDesC8& aBuffer, const TDesC8& aHeader) const |
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201 { |
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202 if (aBuffer.Length() > 0) |
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203 { |
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204 if (aHeader.Length() <= aBuffer.Length()) |
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205 { |
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206 return ((aBuffer.Match(aHeader) != KErrNotFound) ? 1 : 0); |
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207 } |
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208 } |
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209 |
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210 return 0; |
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211 } |
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212 |
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213 |
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214 // |
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215 // This function is called by AppArc when something needs recognising. |
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216 // |
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217 void CMMRUF::DoRecognizeL(const TDesC& aFileName, const TDesC8& aBuffer) |
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218 { |
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219 TMatch match; |
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220 RArray<TMatch> matches; |
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221 CleanupClosePushL(matches); |
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222 |
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223 // If a handle to the file is available, AppArc prepends "::" to the |
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224 // aFileName parameter for some reason. This causes TParse to fail |
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225 // to get the file extension, so we have to fix it. |
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226 TPtrC fName(aFileName); |
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227 if (aFileName.Match(_L("::*")) == 0) |
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228 { |
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229 fName.Set(aFileName.Mid(2)); |
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230 } |
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231 |
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232 TParse parse; |
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233 User::LeaveIfError(parse.Set(fName, NULL, NULL)); |
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234 const TPtrC& ext = parse.Ext(); |
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235 |
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236 RFile* pFile = FilePassedByHandleL(); |
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237 CReader* pReader = (pFile ? CFileReader::NewLC(pFile) : CBufferReader::NewLC(aBuffer)); |
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238 |
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239 // The main recognition loop. |
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240 TBool certainMatch = EFalse; |
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241 for (TInt i = 0; (i < KDataTypesCount) && !certainMatch; i++) |
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242 { |
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243 // Reset the results for each iteration. |
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244 pReader->Reset(); |
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245 match.Reset(); |
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246 |
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247 if (KSigs[i].iHeaderLen == 0) |
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248 { |
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249 // Call the custom recognition function. |
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250 // match contains the results. |
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251 __ASSERT_DEBUG(KSigs[i].iHeaderOrProc, User::Panic(KRUFPanic, KReasonNoFunction)); |
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252 TCustomProc proc = (TCustomProc)(KSigs[i].iHeaderOrProc); |
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253 proc(ext, *pReader, match); |
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254 } |
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255 else |
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256 { |
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257 // This format has a known signature. |
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258 TPtrC8 header(_S8(KSigs[i].iHeaderOrProc), KSigs[i].iHeaderLen); |
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259 |
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260 TUint8 sameHeader = MatchHeader(aBuffer, header); |
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261 TUint8 sameExt = MatchExtension(ext, KSigs[i].iExt); |
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262 TUint8 confIndex = MAKE_BYTE2(sameExt, sameHeader); |
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263 |
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264 match.iConfidence = KResultToConfidence[confIndex]; |
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265 match.iMime = KSigs[i].iMime; |
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266 } |
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267 |
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268 // Evaluate the result. |
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269 switch (match.iConfidence) |
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270 { |
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271 case KConfNotRecognised: |
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272 continue; |
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273 |
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274 case KConfCertain: |
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275 certainMatch = ETrue; |
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276 // Deliberate fall through to add match to array of matches. |
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277 |
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278 case KConfProbable: |
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279 // Add it to the start of the array. |
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280 User::LeaveIfError(matches.Insert(TMatch(match), 0)); |
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281 break; |
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282 |
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283 case KConfPossible: |
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284 // Add it to the end of the array. |
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285 if (matches.Count() == 0) |
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286 { |
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287 User::LeaveIfError(matches.Append(TMatch(match))); |
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288 } |
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289 break; |
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290 |
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291 default: |
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292 // Should never get here. |
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293 User::Leave(KErrArgument); |
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294 } |
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295 } // for (TInt i = 0; i < KDataTypesCount; i++) |
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296 |
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297 // We've done looping. |
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298 if (matches.Count() > 0) |
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299 { |
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300 match = matches[0]; |
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301 SetDataTypeL(match.iConfidence, match.iMime); |
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302 } |
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303 |
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304 CleanupStack::PopAndDestroy(pReader); |
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305 CleanupStack::PopAndDestroy(&matches); |
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306 } |
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307 |
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308 |
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309 |
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310 |