author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 19 Aug 2010 10:59:57 +0300 | |
branch | RCL_3 |
changeset 13 | cb9d56c0e2af |
parent 0 | cec860690d41 |
permissions | -rw-r--r-- |
0
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// Copyright (c) 2007-2009 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: |
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// Implementation of this File System extension |
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// |
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// |
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/** |
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@file |
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*/ |
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#include "win_drive_ext.h" |
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//############################################################################# |
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//# Proxy drive implementation |
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CWinDrvProxyDrive* CWinDrvProxyDrive::NewL(CProxyDrive* aProxyDrive, CMountCB* aMount) |
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{ |
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CWinDrvProxyDrive* pSelf = new(ELeave) CWinDrvProxyDrive(aProxyDrive, aMount); |
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return pSelf; |
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} |
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CWinDrvProxyDrive::CWinDrvProxyDrive(CProxyDrive* aProxyDrive, CMountCB* aMount) |
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:CBaseExtProxyDrive(aProxyDrive, aMount) |
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{ |
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ASSERT(aProxyDrive && aMount); |
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iMount = aMount; |
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iProxyDrive = aProxyDrive; |
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} |
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CWinDrvProxyDrive::~CWinDrvProxyDrive() |
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{ |
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Dismounted(); |
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} |
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//----------------------------------------------------------------------------- |
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/** |
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Initialise the proxy drive (this extension) |
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Initialise() |
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{ |
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__PRINT(_L("#-- CWinDrvProxyDriveFactory::Initialise()")); |
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TInt nRes; |
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ASSERT(!ipMedia); |
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//-- create a scratch buffer |
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nRes = iScratchBuf.CreateMax(65536); |
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if(nRes != KErrNone) |
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return nRes; |
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//-- create media driver object, at present only generic block media supported |
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if(!ipMedia) |
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{ |
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const TInt nEpocDrvNum = iMount->DriveNumber(); |
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ipMedia = new CGenericBlockMedia(nEpocDrvNum); |
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if(!ipMedia) |
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return KErrNoMemory; |
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} |
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//-- connect to the media device |
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nRes = ipMedia->Connect(); |
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return nRes; |
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} |
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/** |
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Dismount this extension. |
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Dismounted() |
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{ |
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__PRINT(_L("#-- CWinDrvProxyDriveFactory::Dismounted()")); |
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//-- disconnect from the media driver and delete it |
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if(ipMedia) |
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{ |
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ipMedia->Disconnect(); |
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delete ipMedia; |
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ipMedia = NULL; |
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} |
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iScratchBuf.Close(); |
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return KErrNone; |
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} |
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//----------------------------------------------------------------------------- |
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TInt CWinDrvProxyDrive::GetInterface(TInt aInterfaceId,TAny*& aInterface,TAny* aInput) |
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{ |
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switch(aInterfaceId) |
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{ |
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case ELocalBufferSupport: |
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return KErrNone; |
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112 |
|
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113 |
default: |
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return CBaseExtProxyDrive::GetInterface(aInterfaceId,aInterface,aInput); |
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} |
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} |
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117 |
|
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//----------------------------------------------------------------------------- |
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119 |
|
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/** |
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121 |
Read data from the media. |
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@param aPos media position to start write with. |
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@param aLength number of bytes to read |
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@param destination data descriptor |
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125 |
|
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Read(TInt64 aPos, TInt aLength, TDes8& aTrg) |
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129 |
{ |
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//__PRINT3(_L("#-- CWinDrvProxyDrive::Read()#0 pos:%LU, desLen:%d, desMaxLen:%d"),aPos, aTrg.Length(), aTrg.MaxLength()); |
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131 |
|
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if(aTrg.MaxLength() == 0) |
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return KErrNone; //-- nothing to do |
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134 |
|
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aTrg.SetLength(0); |
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TInt nRes = ipMedia->Read(aPos, aLength, aTrg); |
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return nRes; |
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} |
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139 |
|
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140 |
|
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//-- try to find a message slot containing the required address |
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#define GetIndex(msg, aAddress, aIndex) \ |
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aIndex = msg.Ptr0() == aAddress ? 0 : \ |
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msg.Ptr1() == aAddress ? 1 : \ |
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msg.Ptr1() == aAddress ? 2 : \ |
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msg.Ptr1() == aAddress ? 3 : -1; |
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147 |
|
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148 |
|
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149 |
|
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/** |
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Read data from the media. |
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@param aPos media position to start write with. |
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@param aLength number of bytes to be written |
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@param aTrg pointer to the destination data descriptor |
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@param aThreadHandle can specify remote thread where the data will be copied to. |
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@param aOffset an offset within the data descriptor to the real data to be written (see aTrg). |
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157 |
|
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Read(TInt64 aPos, TInt aLength, const TAny* aTrg, TInt aThreadHandle, TInt aOffset) |
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161 |
{ |
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//__PRINT4(_L("#-- CWinDrvProxyDrive::Read()#1 pos:%LU, offset:%d, desLen:%d, desMaxLen:%d"),aPos, aOffset, desData.Length(), desData.MaxLength()); |
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ASSERT(aTrg); |
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164 |
|
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//-- N.B. aTrg is a pointer to the data descriptor TDes8 ! |
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TDes8& orgDes = *((TDes8*)aTrg); |
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167 |
|
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if(aLength == 0) |
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return KErrNone; //-- nothing to do |
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170 |
|
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171 |
|
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if(aOffset < 0 || aOffset+aLength > orgDes.MaxLength()) |
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return KErrArgument; |
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174 |
|
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175 |
|
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//-- check if we have local or remote message from a different process |
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177 |
|
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TBool localMessage = (aThreadHandle == KLocalMessageHandle); |
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if(!localMessage) |
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{ |
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RMessage2 msg(*(RMessagePtr2 *) &aThreadHandle); |
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localMessage = (msg.Handle() == KLocalMessageHandle); |
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} |
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184 |
|
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if(localMessage) |
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{//-- we can just copy data to the descriptor; it is the same process |
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TPtr8 desData((TUint8*)(orgDes.Ptr()+aOffset), orgDes.Length()-aOffset); |
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return ipMedia->Read(aPos, aLength, desData); |
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} |
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else |
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{//-- we have to read data to the local buffer first and then write to another process |
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TInt msgSlotIdx = 0; |
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RMessage2 msg(*(RMessagePtr2 *) &aThreadHandle); |
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194 |
|
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GetIndex(msg, aTrg, msgSlotIdx); //-- find out message slot index containing the desctiptor data |
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if (msgSlotIdx < 0) |
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return KErrArgument; |
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198 |
|
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TInt rem = aLength; |
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TInt localOffset = 0; |
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201 |
|
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while(rem) |
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{ |
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const TInt bytesToRead = Min(rem, iScratchBuf.Size()); |
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TPtr8 ptrBuf((TUint8*)iScratchBuf.Ptr(), bytesToRead); |
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206 |
|
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//-- read chunk of data from the media to the local buffer |
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TInt nRes = ipMedia->Read(aPos + localOffset, bytesToRead, ptrBuf); |
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if(nRes != KErrNone) |
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return nRes; //-- media read error |
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211 |
|
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//-- write data from the local buffer to another process |
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nRes = msg.Write(msgSlotIdx, ptrBuf, aOffset+localOffset); |
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if(nRes != KErrNone) |
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return nRes; |
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rem -= bytesToRead; |
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localOffset += bytesToRead; |
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} |
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220 |
|
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return KErrNone; |
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} |
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223 |
|
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224 |
|
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} |
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226 |
|
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/** the same as above */ |
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TInt CWinDrvProxyDrive::Read(TInt64 aPos,TInt aLength, const TAny* aTrg,TInt aThreadHandle, TInt aOffset,TInt /*aFlags*/) |
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{ |
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//__PRINT4(_L("#-- CWinDrvProxyDrive::Read()#2 pos:%LU, offset:%d, desLen:%d, desMaxLen:%d"),aPos, aOffset, desData.Length(), desData.MaxLength()); |
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return Read(aPos, aLength, aTrg, aThreadHandle, aOffset); |
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} |
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233 |
|
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234 |
|
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//----------------------------------------------------------------------------- |
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236 |
|
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/** |
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Write data to the media. |
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@param aPos media position to start write with. |
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@param aSrc data descriptor |
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241 |
|
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Write(TInt64 aPos, const TDesC8& aSrc) |
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{ |
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//__PRINT2(_L("#-- CWinDrvProxyDrive::Write()#0 pos:%LU, desLen:%d"),aPos, aSrc.Length()); |
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|
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if(aSrc.Length() == 0 ) |
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return KErrNone; //-- nothing to do |
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|
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TInt nRes = ipMedia->Write(aPos, aSrc.Size(), aSrc); |
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|
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return nRes; |
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} |
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255 |
|
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/** |
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Write data to the media. |
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@param aPos media position to start write with. |
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@param aLength number of bytes to be written |
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@param aSrc pointer to the data descriptor |
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@param aThreadHandle can specify remote thread where the data will be got from. |
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@param aOffset an offset within the data descriptor to the real data to be written (see aSrc). |
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263 |
|
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@return standard epoc error code. |
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*/ |
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TInt CWinDrvProxyDrive::Write(TInt64 aPos, TInt aLength, const TAny* aSrc, TInt aThreadHandle, TInt aOffset) |
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{ |
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//__PRINT3(_L("#-- CWinDrvProxyDrive::Write()#1 pos:%LU, offset:%d, desLen:%d"),aPos, aOffset, orgDes.Length()); |
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|
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ASSERT(aSrc); |
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|
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TDesC8& orgDes = *((TDesC8*)aSrc); |
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|
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if(orgDes.Length() == 0 || aLength == 0) |
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return KErrNone; //-- nothing to do |
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|
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if(aOffset < 0 || aOffset+aLength > orgDes.Length()) |
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return KErrArgument; |
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279 |
|
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280 |
|
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//-- check if we have local or remote message from a different process |
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282 |
|
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TBool localMessage = (aThreadHandle == KLocalMessageHandle); |
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if(!localMessage) |
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{ |
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RMessage2 msg(*(RMessagePtr2 *) &aThreadHandle); |
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localMessage = (msg.Handle() == KLocalMessageHandle); |
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} |
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289 |
|
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if(localMessage) |
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{//-- we can just copy data from the descriptor; it is the same process |
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TPtrC8 dataDes(orgDes.Ptr()+aOffset, orgDes.Length()-aOffset); |
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return ipMedia->Write(aPos, aLength, dataDes); |
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} |
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else |
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{//-- we have to copy data to the local buffer first and then write to the media. |
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TInt msgSlotIdx = 0; |
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|
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RMessage2 msg(*(RMessagePtr2 *) &aThreadHandle); |
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GetIndex(msg, aSrc, msgSlotIdx); |
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301 |
|
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if (msgSlotIdx < 0) |
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return KErrArgument; |
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|
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TInt rem = aLength; |
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TInt localOffset = 0; |
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|
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while(rem) |
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{ |
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const TInt bytesToWrite = Min(rem, iScratchBuf.Size()); |
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311 |
|
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TInt nRes = msg.Read(msgSlotIdx, iScratchBuf, aOffset+localOffset); |
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if(nRes != KErrNone) |
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return nRes; |
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|
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nRes = ipMedia->Write(aPos+localOffset, bytesToWrite, iScratchBuf); |
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if(nRes != KErrNone) |
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return nRes; |
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319 |
|
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rem -= bytesToWrite; |
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localOffset += bytesToWrite; |
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} |
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324 |
|
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return KErrNone; |
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} |
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327 |
|
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} |
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329 |
|
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330 |
|
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331 |
|
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/** the same as above */ |
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TInt CWinDrvProxyDrive::Write(TInt64 aPos,TInt aLength,const TAny* aSrc,TInt aThreadHandle, TInt aOffset,TInt /*aFlags*/) |
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334 |
{ |
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//__PRINT3(_L("#-- CWinDrvProxyDrive::Write()#2 pos:%LU, offset:%d, desLen:%d"),aPos, aOffset, orgDes.Length()); |
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return Write(aPos, aLength, aSrc, aThreadHandle, aOffset); |
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} |
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338 |
|
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339 |
|
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//----------------------------------------------------------------------------- |
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341 |
|
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/** |
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343 |
get drive capabilities |
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@param anInfo packed descriptor of TLocalDriveCaps |
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@return standard Epoc error code |
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*/ |
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TInt CWinDrvProxyDrive::Caps(TDes8& anInfo) |
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{ |
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TInt nRes; |
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350 |
|
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//-- get capabilities of the EPOC drive we are overriding |
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nRes = CBaseExtProxyDrive::Caps(anInfo); |
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if(nRes != KErrNone) |
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return nRes; |
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355 |
|
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TLocalDriveCaps& orgCaps = ((TLocalDriveCapsBuf&)anInfo)(); |
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357 |
|
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//-- override capabilities with the data from our device. |
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ipMedia->GetEpocCaps(orgCaps); |
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360 |
|
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return KErrNone; |
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} |
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363 |
|
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//----------------------------------------------------------------------------- |
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365 |
|
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366 |
/** |
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Format whole media. |
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This method can be called many times, each call represents the formatting step. |
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|
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@param anInfo specifies the formatting parameters. |
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@return KErrNone if the formatting step has gone OK. |
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KErrEof if the formatting has finished |
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standard epoc error code otherwise. |
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|
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*/ |
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TInt CWinDrvProxyDrive::Format(TFormatInfo& anInfo) |
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{ |
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return ipMedia->Format(anInfo); |
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} |
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380 |
|
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/** |
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format part of the media |
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@param aPos starting media position |
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@param aLength length of the media space to be formatted. |
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385 |
|
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@return standard epoc error code |
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387 |
*/ |
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388 |
TInt CWinDrvProxyDrive::Format(TInt64 aPos, TInt aLength) |
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389 |
{ |
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390 |
return ipMedia->Format(aPos, aLength); |
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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 |
|
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397 |
//############################################################################# |
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398 |
//# Extension factory implementation |
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399 |
|
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400 |
CWinDrvProxyDriveFactory::CWinDrvProxyDriveFactory() |
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401 |
{ |
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402 |
} |
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|
403 |
|
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404 |
TInt CWinDrvProxyDriveFactory::Install() |
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405 |
{ |
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406 |
_LIT(KExtensionName,"Win_Drive"); //-- this extensoin name. |
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407 |
|
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408 |
__PRINT(_L("#-- CWinDrvProxyDriveFactory::Install()")); |
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409 |
return(SetName(&KExtensionName)); |
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410 |
} |
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|
411 |
|
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412 |
CProxyDrive* CWinDrvProxyDriveFactory::NewProxyDriveL(CProxyDrive* aProxy, CMountCB* aMount) |
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413 |
{ |
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414 |
__PRINT(_L("#-- CWinDrvProxyDriveFactory::NewProxyDriveL()")); |
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415 |
return (CWinDrvProxyDrive::NewL(aProxy, aMount)); |
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416 |
} |
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|
417 |
|
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|
418 |
|
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|
419 |
/** DLL entrypoint */ |
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420 |
extern "C" |
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421 |
{ |
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422 |
EXPORT_C CProxyDriveFactory* CreateFileSystem() |
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423 |
{ |
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424 |
__PRINT(_L("#-- Win_Drive extension CreateFileSystem()")); |
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425 |
return new CWinDrvProxyDriveFactory(); |
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426 |
} |
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|
427 |
} |
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|
428 |
|
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