author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:11:40 +0200 | |
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// Copyright (c) 2003-2009 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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// |
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/** |
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@file |
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@internalComponent |
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*/ |
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#include <f32file.h> |
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#include "obexasyncfilewriter.h" |
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#include "logger.h" |
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#ifdef __FLOG_ACTIVE |
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_LIT8(KLogComponent, "OBEX"); |
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#endif |
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// |
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// Panic category for CObexAsyncFileWriter |
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// |
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_LIT(KObexAsyncFileWriterPanic, "Obex-AFW"); |
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/** |
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Panic codes for CObexAsyncFileWriter |
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@internalComponent |
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@released |
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*/ |
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enum TAsyncObexFileWriterPanic |
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{ |
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/** Null buffer pointer */ |
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ENullBufferPointer |
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}; |
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// |
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// Implementation of CObexAsyncFileWriter |
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// |
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/** |
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Factory function |
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Note that we return a pointer to the interface class, so |
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that this class can only be used through this interface. |
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This class in an implementation of a strategy as part of |
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a Strategy pattern. CObexSyncFileWriter provides an |
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alternative strategy implementation, with CObexBufObject |
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as the context for these strategies. |
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@see MObexFileWriter |
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@see CObexSyncFileWriter |
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@see CObexBufObject |
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@internalComponent |
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@released |
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@param aFile The file we're writing to |
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@return An MObexFileWriter for writing to file |
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*/ |
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MObexFileWriter* CObexAsyncFileWriter::NewL(RFile& aFile) |
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{ |
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CObexAsyncFileWriter* self = new(ELeave) CObexAsyncFileWriter(aFile); |
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CleanupStack::PushL(self); |
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self->ConstructL(); |
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CleanupStack::Pop(self); |
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return self; |
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} |
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/** |
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Constructor |
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@internalComponent |
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@released |
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@param aFile The file we're writing to |
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*/ |
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CObexAsyncFileWriter::CObexAsyncFileWriter(RFile& aFile) |
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: CActive(EPriorityStandard), iFile(aFile), iBufPtr(NULL, 0) |
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{ |
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CActiveScheduler::Add(this); |
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} |
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/** |
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2nd phase constructor |
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@internalComponent |
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@released |
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*/ |
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void CObexAsyncFileWriter::ConstructL() |
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{ |
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} |
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/** |
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AO cancellation |
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@internalComponent |
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107 |
@released |
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108 |
*/ |
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109 |
void CObexAsyncFileWriter::DoCancel() |
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110 |
{ |
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iFile.Flush(); |
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} |
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113 |
|
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114 |
/** |
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AO request completion |
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116 |
|
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@internalComponent |
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@released |
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*/ |
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void CObexAsyncFileWriter::RunL() |
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121 |
{ |
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// Just ignore completions; the status is picked up next time |
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// a service function is called |
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} |
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125 |
|
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126 |
/** |
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Normal asynchronous write to file |
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128 |
|
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@internalComponent |
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@released |
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131 |
|
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@param aPos The file position |
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@param aBuf The buffer we're to write. We use this buffer by copying the pointer |
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and return the buffer we previously wrote to the caller by updating |
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the pointer. If an error occurs, the buffers are not swapped and |
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the pointer is not updated. Note that this class never owns any |
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buffers and that passing a buffer to this function does not imply a |
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transfer of ownership. |
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@return Symbian OS error code |
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*/ |
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TInt CObexAsyncFileWriter::Write(TInt aPos, CBufBase*& aBuf) |
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142 |
{ |
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__ASSERT_ALWAYS(aBuf, PANIC(KObexAsyncFileWriterPanic, ENullBufferPointer)); |
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144 |
|
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// If last write to file has not completed... |
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if (IsActive()) |
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147 |
{ |
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// wait for it to complete |
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User::WaitForRequest(iStatus); |
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150 |
|
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// if we had an error on the last write |
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if (iStatus.Int()) |
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153 |
{ |
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// Signal ourselves again with the error |
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TRequestStatus* status = &iStatus; |
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User::RequestComplete(status, iStatus.Int()); |
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// and then de-activate ourselves by cancelling |
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Cancel(); |
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159 |
} |
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// if we didn't have an error on the last write, |
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// we've consumed the completion of the write and |
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// hence are still active |
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163 |
} |
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164 |
|
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if (!iStatus.Int()) |
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// if the last write completed successfully... |
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167 |
{ |
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// Swap our and the caller's pointers to show we |
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// have swapped which buffers we are using. Note |
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// that the ownership of the buffers is not changed |
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// by this and the caller must deallocate any buffers |
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// it owns which are passed to this function. |
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CBufBase* buf = iBuffer; |
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iBuffer = aBuf; |
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aBuf = buf; |
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176 |
|
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// Set up the descriptor to be passed to the file write |
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iBufPtr.Set(iBuffer->Ptr(0)); |
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179 |
|
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// We'll need to be active to service another write |
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if (!IsActive()) |
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182 |
{ |
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SetActive(); |
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184 |
} |
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185 |
|
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// kick off writing the next block |
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iFile.Write(aPos, iBufPtr, iStatus); |
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188 |
|
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// and we're happy... |
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return KErrNone; |
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191 |
} |
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192 |
else |
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// the last write did not complete successfully |
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194 |
{ |
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// Signal Obex error |
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return iStatus.Int(); |
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197 |
} |
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198 |
|
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199 |
} |
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200 |
|
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201 |
/** |
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Final, synchronous write to file |
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203 |
|
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@internalComponent |
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@released |
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206 |
|
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@param aPos The file position |
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@param aBuf The buffer we're to write. We use this buffer by copying the pointer |
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and return the buffer we previously wrote to the caller by updating |
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210 |
the pointer. If an error occurs, the buffers are not swapped and |
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211 |
the pointer is not updated. Note that this class never owns any |
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212 |
buffers and that passing a buffer to this function does not imply a |
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transfer of ownership. |
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@param aLength The amount of the buffer to write |
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@return Symbian OS error code |
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*/ |
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TInt CObexAsyncFileWriter::FinalWrite(TInt aPos, CBufBase*& aBuf, TInt aLength) |
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{ |
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__ASSERT_ALWAYS(aBuf, PANIC(KObexAsyncFileWriterPanic, ENullBufferPointer)); |
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|
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// If last write to file has not completed... |
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if (IsActive()) |
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{ |
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// wait for it to complete |
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User::WaitForRequest(iStatus); |
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|
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// Signal ourselves again with the request status |
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TRequestStatus* status = &iStatus; |
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User::RequestComplete(status, iStatus.Int()); |
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|
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// and then de-activate ourselves by cancelling |
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Cancel(); |
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} |
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|
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// if the last write completed successfully... |
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if (!iStatus.Int()) |
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{ |
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// Swap our and the caller's pointers to show we |
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// have swapped which buffers we are using. Note |
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// that the ownership of the buffers is not changed |
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// by this and the caller must deallocate any buffers |
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// it owns which are passed to this function. |
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CBufBase* buf = iBuffer; |
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iBuffer = aBuf; |
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aBuf = buf; |
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|
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// Set up the descriptor to be passed to the file write |
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iBufPtr.Set(iBuffer->Ptr(0)); |
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iBufPtr.SetLength(aLength); |
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|
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// write the final block and return the error |
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TInt err = iFile.Write(aPos, iBufPtr); |
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if (err == KErrNone) |
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{ |
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//flush the buffer, commit the write |
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return iFile.Flush(); |
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} |
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else |
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{ |
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return err; |
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} |
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} |
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else |
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// the last write did not complete successfully |
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{ |
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// Signal Obex error |
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return iStatus.Int(); |
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} |
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} |
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|
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/** |
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Destructor |
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|
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@internalComponent |
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@released |
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*/ |
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CObexAsyncFileWriter::~CObexAsyncFileWriter() |
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{ |
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Cancel(); |
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} |