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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: This file contains an implementation of Symbian MIME type recognizer |
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15 * for MIME types application/java-archive (.jar) and |
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16 * text/vnd.sun.j2me.app-descriptor (.jad) |
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17 * |
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18 */ |
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19 |
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20 |
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21 #include <apmrec.h> |
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22 #include <apmstd.h> |
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23 #include <ecom/ecom.h> |
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24 #include <ecom/implementationproxy.h> |
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25 |
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26 #include "javauids.h" |
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27 #include "recjar.h" |
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28 |
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29 const TUid KJavaRecognizerTUid = { KJavaRecognizerDllUid}; |
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30 const TInt KJarNumMimeTypes = 2; |
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31 |
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32 const TInt KMaxBufferLength = 100; |
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33 _LIT8(KDataTypeJavaArchive, "application/java-archive"); |
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34 _LIT8(KDataTypeAppDescriptor, "text/vnd.sun.j2me.app-descriptor"); |
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35 // First four bytes of a ZIP file |
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36 _LIT8(KPkWareLocalFileHeader, "\x50\x4B\x03\x04"); |
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37 _LIT8(KMidlet,"Midlet-"); |
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38 |
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39 CApaJarRecognizer::CApaJarRecognizer() : |
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40 CApaDataRecognizerType(KJavaRecognizerTUid, CApaDataRecognizerType::EHigh) |
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41 { |
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42 iCountDataTypes = KJarNumMimeTypes; |
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43 } |
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44 |
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45 TUint CApaJarRecognizer::PreferredBufSize() |
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46 { |
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47 return KMaxBufferLength; |
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48 } |
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49 |
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50 TDataType CApaJarRecognizer::SupportedDataTypeL(TInt aIndex) const |
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51 { |
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52 __ASSERT_DEBUG(aIndex >= 0 && aIndex < KJarNumMimeTypes, User::Invariant()); |
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53 switch (aIndex) |
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54 { |
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55 case 0: |
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56 return TDataType(KDataTypeJavaArchive); |
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57 case 1: |
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58 return TDataType(KDataTypeAppDescriptor); |
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59 default: |
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60 // Should not come here, keep GCC happy |
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61 return TDataType(KDataTypeJavaArchive); |
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62 } |
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63 } |
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64 |
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65 void CApaJarRecognizer::DoRecognizeL(const TDesC& aName, const TDesC8& aBuffer) |
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66 { |
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67 if (aName.Length() > 4) |
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68 { |
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69 if (aName.Right(4).CompareF(_L(".jad")) == 0) |
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70 { |
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71 if (aBuffer.Length() > 0 && aBuffer.FindF(KMidlet()) |
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72 != KErrNotFound) |
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73 { |
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74 // The file contains the text "midlet-" |
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75 // so its almost certain to be a JAD file |
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76 iDataType = TDataType(KDataTypeAppDescriptor); |
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77 iConfidence = ECertain; |
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78 } |
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79 else |
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80 { |
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81 // Did not find "midlet-" in the supplied buffer so |
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82 // try searching the rest of the file... |
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83 // |
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84 TBool weOwnFileHandle = EFalse; |
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85 // The following call only Leaves if user supplied file |
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86 // handle can not be rewound, this is not worth |
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87 // catching with a TRAP handler. |
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88 RFile *file = FilePassedByHandleL(); |
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89 RFile ownFile; |
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90 RFs ownFs; |
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91 if (!file) |
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92 { |
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93 // We were not passed an RFile, so try and open the file directly. |
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94 User::LeaveIfError(ownFs.Connect()); |
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95 CleanupClosePushL(ownFs); |
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96 User::LeaveIfError(ownFile.Open(ownFs, aName, EFileRead |
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97 | EFileShareReadersOrWriters | EFileStream)); |
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98 CleanupClosePushL(ownFile); |
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99 file = &ownFile; |
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100 weOwnFileHandle = ETrue; |
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101 } |
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102 |
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103 TInt fileRemaining; |
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104 User::LeaveIfError(file->Size(fileRemaining)); |
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105 if (fileRemaining > aBuffer.Length()) |
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106 { |
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107 // File is longer than buffer, so search remainder |
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108 // of file. |
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109 |
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110 // Skip the start, which has already been read |
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111 TInt tmp = aBuffer.Length(); |
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112 User::LeaveIfError(file->Seek(ESeekStart, tmp)); |
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113 fileRemaining -= tmp; |
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114 |
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115 // Buffer for processing the file |
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116 TUint8 buf[100]; // Must be at least 2*(KMidlet.Length()-1) |
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117 |
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118 // Copy up to the last KMidlet.Length()-1 bytes |
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119 // from aBuffer, then append file data. This |
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120 // handles the case where the KMidlet string |
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121 // straddles the boundry by a byte (eg. buffer |
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122 // ends with "Midlet" and we are looking for |
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123 // "Midlet-"). |
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124 TInt prefixLength = KMidlet().Length() - 1; |
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125 if (aBuffer.Length() < prefixLength) |
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126 { |
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127 prefixLength = aBuffer.Length(); |
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128 } |
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129 TInt prefixOffset = aBuffer.Length() - prefixLength; |
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130 if (prefixOffset < 0) |
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131 { |
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132 prefixOffset = 0; |
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133 } |
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134 |
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135 if (prefixLength) |
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136 { |
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137 // Copy prefix into buffer |
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138 TPtr8 prefixDes(&buf[0], prefixLength); |
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139 prefixDes = aBuffer.Mid(prefixOffset, prefixLength); |
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140 } |
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141 |
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142 while (fileRemaining > 0) |
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143 { |
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144 // Read as much file data into the buffer as possible. |
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145 TPtr8 bufBodyDes(&buf[0] + prefixLength, sizeof(buf) |
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146 - prefixLength); |
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147 User::LeaveIfError(file->Read(bufBodyDes)); |
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148 fileRemaining -= bufBodyDes.Length(); |
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149 |
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150 TPtrC8 bufDes(&buf[0], prefixLength |
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151 + bufBodyDes.Length()); |
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152 if (bufDes.FindF(KMidlet()) != KErrNotFound) |
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153 { |
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154 // The file contains the text "midlet-" |
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155 // so its almost certain to be a JAD file |
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156 iDataType = TDataType(KDataTypeAppDescriptor); |
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157 iConfidence = ECertain; |
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158 break; |
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159 } |
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160 // Not found, copy prefix to start of buffer and try again. |
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161 if (bufDes.Length() == sizeof(buf)) |
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162 { |
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163 // Copy prefix into buffer |
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164 prefixLength = KMidlet().Length() - 1; |
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165 TPtr8 prefixDes(buf, prefixLength); |
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166 prefixDes = bufDes.Mid(bufDes.Length() |
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167 - prefixLength, prefixLength); |
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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 if (weOwnFileHandle) |
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173 { |
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174 CleanupStack::PopAndDestroy(&ownFile); |
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175 CleanupStack::PopAndDestroy(&ownFs); |
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176 } |
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177 } |
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178 } |
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179 else if (aName.Right(4).CompareF(_L(".jar")) == 0) |
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180 { |
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181 // if the first 4 bytes of the buffer match the first 4 |
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182 // bytes of a zip file it must be a JAR file |
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183 if (aBuffer.Length() > KPkWareLocalFileHeader().Length() |
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184 && KPkWareLocalFileHeader().Compare(aBuffer.Left(4)) == 0) |
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185 { |
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186 iDataType = TDataType(KDataTypeJavaArchive); |
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187 iConfidence = ECertain; |
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188 } |
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189 } |
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190 } |
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191 |
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192 return; |
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193 } |
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194 |
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195 CApaDataRecognizerType* CApaJarRecognizer::CreateRecognizerL() |
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196 { |
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197 return new(ELeave) CApaJarRecognizer(); |
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198 } |
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199 |
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200 const TImplementationProxy ImplementationTable[] = |
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201 { |
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202 IMPLEMENTATION_PROXY_ENTRY(KRecognizerEcomImplUid, CApaJarRecognizer::CreateRecognizerL) |
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203 }; |
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204 |
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205 EXPORT_C const TImplementationProxy* ImplementationGroupProxy(TInt& aTableCount) |
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206 { |
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207 aTableCount = sizeof(ImplementationTable) / sizeof(TImplementationProxy); |
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208 return ImplementationTable; |
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209 } |
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210 |