author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
changeset 71 | 28ccaba883f4 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Implementation of system special file recognizer. |
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* |
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*/ |
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|
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|
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// INCLUDE FILES |
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#include <f32file.h> |
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#include <errno.h> |
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#include <sys/stat.h> |
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#include <string.h> |
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#include <liblogger.h> |
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|
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#include "systemspecialfilercg.h" |
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#include "sysif.h" |
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#include "lposix.h" |
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#include "fdesc.h" |
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|
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// EXTERNAL DATA STRUCTURES |
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#ifndef EMULATOR |
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const char *KFileEncodeStr= "deadbeef"; |
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const char *Kkey= "XXXXXXXX"; |
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#else //EMULATOR |
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|
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const char * const KFileEncodeStr= "deadbeef"; |
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const char * const Kkey= "XXXXXXXX"; |
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#endif //EMULATOR |
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|
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// ----------------------------------------------------------------------------- |
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// _EncodeSystemSplFileMagicHeader |
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// Encode the system special file magic header. |
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// ----------------------------------------------------------------------------- |
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// |
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int _EncodeSystemSplFileMagicHeader( |
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struct SSpecialFileMagicHeader *aEncBuf, |
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TSpecialFileType aFileType) |
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{ |
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if ( aEncBuf == NULL |
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|| (aFileType <= EFileTypeGeneral || aFileType >= EFileTypeMax)) |
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{ |
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return -1; |
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} |
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TInt counter = 0; |
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for (counter = 0; counter < KMaxEncDecBuf - 1; counter++) |
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{ |
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aEncBuf->iMagicBuffer[counter] = (KFileEncodeStr[counter] ^ Kkey[counter]); |
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} |
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aEncBuf->iMagicBuffer[counter] = 0; |
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|
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aEncBuf->iFileType = aFileType; |
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return 0; |
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} |
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// ----------------------------------------------------------------------------- |
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// _SystemSpecialFileBasedBuffer |
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// Try to retrieve file type from buffer. |
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// ----------------------------------------------------------------------------- |
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// |
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TSpecialFileType _SystemSpecialFileBasedBuffer(const char *buf) |
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{ |
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struct SSpecialFileMagicHeader fInfo; |
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TInt i = 0; |
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for (i = 0; i < KMaxEncDecBuf - 1; i++) |
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{ |
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fInfo.iMagicBuffer[i] = (*buf++ ^ Kkey[i]); |
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} |
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fInfo.iMagicBuffer[i] = *buf++; |
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fInfo.iFileType = *buf; |
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|
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if(StrCmp(fInfo.iMagicBuffer, KFileEncodeStr) == 0) |
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{ |
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return (TSpecialFileType)fInfo.iFileType; |
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} |
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return EFileTypeGeneral; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// _SystemSpecialFileBasedFilePath |
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// Try to retrieve file type from file name (wchar_t*). |
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// ----------------------------------------------------------------------------- |
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// |
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EXPORT_C TSpecialFileType _SystemSpecialFileBasedFilePath |
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(const wchar_t* aPathName, TInt& aErrno, RSessionBase& aSession) |
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{ |
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TSpecialFileType retVal = EFileTypeGeneral; |
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TFullName fullName; |
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RFILE file; |
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RFs& fsSession = static_cast<RFs&>(aSession); |
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aErrno = GetFullFile(fullName,(const TText16*)aPathName,fsSession); |
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if (!aErrno) |
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|
106 |
{ |
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107 |
TInt encSize = sizeof(struct SSpecialFileMagicHeader); |
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|
108 |
TBuf8<sizeof(struct SSpecialFileMagicHeader)> encBuf; |
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109 |
//Read the file header without opening it |
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110 |
aErrno = fsSession.ReadFileSection(fullName, 0, encBuf, encSize); |
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111 |
switch (aErrno) |
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112 |
{ |
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113 |
case KErrNone: |
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114 |
retVal = _SystemSpecialFileBasedBuffer((const char*)encBuf.Ptr()); |
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115 |
break; |
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116 |
case KErrNotFound: |
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117 |
retVal = EFileNotFound; |
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118 |
break; |
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119 |
case KErrPathNotFound: |
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120 |
retVal = EFileNotFound; |
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121 |
break; |
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122 |
default: |
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123 |
retVal = EFileGeneralError; |
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124 |
break; |
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125 |
} |
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126 |
} |
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127 |
return retVal; |
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128 |
} |
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129 |
|
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130 |
// ----------------------------------------------------------------------------- |
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131 |
// _DeleteSystemSpecialFileBasedFilePath |
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132 |
// delete a system file (wide char). |
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133 |
// ----------------------------------------------------------------------------- |
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134 |
// |
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135 |
TInt _DeleteSystemSpecialFileBasedFilePath |
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136 |
(const wchar_t* aPathName, RSessionBase& aSession) |
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137 |
{ |
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138 |
TSpecialFileType fileType = EFileTypeGeneral; |
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139 |
TFullName fullName; |
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140 |
RFILE file; |
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141 |
RFs& fsSession = static_cast<RFs&>(aSession); |
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142 |
TInt err=GetFullFile(fullName,(const TText16*)aPathName,fsSession); |
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143 |
if (!err) |
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144 |
{ |
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145 |
TInt encSize = sizeof(struct SSpecialFileMagicHeader); |
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146 |
TBuf8<sizeof(struct SSpecialFileMagicHeader)> encBuf; |
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147 |
err = fsSession.ReadFileSection(fullName, 0, encBuf, encSize); |
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148 |
if (err == KErrNone) |
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149 |
{ |
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150 |
fileType = _SystemSpecialFileBasedBuffer((const char*)encBuf.Ptr()); |
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151 |
if (fileType > EFileTypeGeneral && fileType < EFileTypeMax) |
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152 |
{ |
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153 |
err = fsSession.Delete(fullName); |
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154 |
} |
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155 |
} |
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156 |
} |
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157 |
return err; |
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158 |
} |
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159 |
|
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160 |
// ----------------------------------------------------------------------------- |
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161 |
// _CreateSysSplFile |
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162 |
// Create a system file. |
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163 |
// ----------------------------------------------------------------------------- |
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164 |
// |
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165 |
int _CreateSysSplFile(const wchar_t *pathName, |
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166 |
const char* aData, |
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167 |
const int aLen, |
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168 |
int& anErrno, |
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169 |
RSessionBase& aSession) |
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170 |
{ |
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171 |
TFullName fullName; |
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172 |
RFILE file; |
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173 |
mode_t mode; |
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174 |
RFs& fsSession = static_cast<RFs&>(aSession); |
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175 |
TInt err=GetFullFile(fullName,(const TText16*)pathName,fsSession); |
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|
176 |
|
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177 |
TParse path; |
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178 |
path.Set(fullName,NULL,NULL); |
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|
179 |
TPtrC pth = path.Path(); |
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180 |
TFileName pvtPath; |
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|
181 |
fsSession.PrivatePath(pvtPath); |
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|
182 |
//the below code is removed from getfullfile and explicitly added here so that creation of private path unnecessarily could be avoided while calling getfullfile() |
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|
183 |
if (!(pth.CompareF(pvtPath))) |
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|
184 |
{ |
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185 |
TEntry ent; |
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186 |
TFileName Pvt; |
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187 |
//returns in the format Drive: |
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|
188 |
TPtrC ptr = path.Drive(); |
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|
189 |
Pvt.Copy(ptr); |
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190 |
Pvt.Append(pvtPath); |
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191 |
if (fsSession.Entry(Pvt , ent) == KErrNotFound) |
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|
192 |
{ |
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|
193 |
TInt ret = 0; |
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|
194 |
TInt driveNumber; |
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|
195 |
fsSession.CharToDrive((TUint)ptr[0], driveNumber); |
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196 |
//creates the private path |
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|
197 |
ret = fsSession.CreatePrivatePath(driveNumber); |
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|
198 |
if ((ret == KErrAlreadyExists) || (ret == KErrNone)) |
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|
199 |
{ |
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|
200 |
err = 0; |
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|
201 |
} |
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|
202 |
else |
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|
203 |
{ |
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|
204 |
err = ret; |
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|
205 |
} |
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|
206 |
} |
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|
207 |
} |
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|
208 |
if (!err) |
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|
209 |
{ |
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|
210 |
mode = EFileWrite| EFileStream; |
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|
211 |
err = file.Create(fsSession, fullName, (TUint)mode); |
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212 |
if(err == KErrNone) |
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{ |
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TUint att = KEntryAttHidden | KEntryAttSystem; |
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err = file.SetAtt(att, 0); |
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if(err == KErrNone) |
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{ |
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TPtr8 data((TUint8*)aData, aLen, aLen); |
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err = file.Write(data); |
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if(!err) |
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{ |
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err = file.Flush(); |
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if(!err) |
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{ |
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file.Close(); |
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anErrno = err; |
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return err; |
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} |
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} |
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} |
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fsSession.Delete(fullName); |
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file.Close(); |
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anErrno = EROFS; |
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return -1; |
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} |
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else if (err == KErrPathNotFound) |
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{ |
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// file exist??? |
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TParsePtr parser(fullName); |
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fullName = parser.DriveAndPath(); |
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241 |
|
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TParsePtr oneStepDownParser(fullName); |
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|
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TFindFile findFile(fsSession); |
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if ( KErrNone == findFile.FindByDir |
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(oneStepDownParser.FullName(), |
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oneStepDownParser.DriveAndPath())) |
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{ |
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// file exist. |
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err = ENOTDIR; |
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} |
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|
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} |
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} |
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|
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if (err == KErrNotReady) |
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{ |
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anErrno = ENOENT; |
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return -1; |
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} |
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|
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return MapError(err, anErrno); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// _ReadSysSplFile |
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// Read a system file. |
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// ----------------------------------------------------------------------------- |
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// |
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EXPORT_C int _ReadSysSplFile(const wchar_t *aFullFileName, |
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char* aBuf, |
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const int aLen, |
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int& anErrno, |
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RSessionBase& aSession) |
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{ |
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TFullName fullName; |
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RFILE file; |
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RFs& fsSession = static_cast<RFs&>(aSession); |
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mode_t mode; |
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TInt err=GetFullFile(fullName,(const TText16*)aFullFileName,fsSession); |
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if (!err) |
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282 |
{ |
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mode = EFileRead | EFileStream; |
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err = file.Open(fsSession, fullName, (TUint)mode); |
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if(err == KErrNone) |
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286 |
{ |
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TPtr8 data((TUint8*)aBuf, aLen, aLen); |
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err = file.Read(data); |
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file.Close(); |
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} |
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291 |
} |
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if (err != KErrNone) |
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293 |
{ |
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MapError(err, anErrno); |
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} |
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return err; |
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} |
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298 |
|
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299 |
// End of File |