engine/src/HttpEventHandler.cpp
author teknolog
Sun, 04 Apr 2010 21:47:56 +0100
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Even more robustness improvements for HTTP client - specifically disk full problems
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/*
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* Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB
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*
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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 the License "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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* EmbedDev AB - 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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// HttpEventHandler.cpp
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#include <e32debug.h>
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#include <httperr.h>
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#include "HttpEventHandler.h"
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#include "bautils.h"
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#include "Httpclient.h"
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void CHttpEventHandler::ConstructL()
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	{
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	//iVerbose = ETrue;	
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	}
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CHttpEventHandler::CHttpEventHandler(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs): 
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	iFileServ(aFs), iHttpClient(aClient), iCallbacks(aCallbacks)
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	{
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	}
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CHttpEventHandler::~CHttpEventHandler()
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	{	
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	}
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CHttpEventHandler* CHttpEventHandler::NewLC(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs)
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	{
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	CHttpEventHandler* me = new(ELeave)CHttpEventHandler(aClient, aCallbacks, aFs);
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	CleanupStack::PushL(me);
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	me->ConstructL();
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	return me;
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	}
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CHttpEventHandler* CHttpEventHandler::NewL(CHttpClient* aClient, MHttpClientObserver &aCallbacks, RFs& aFs)
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	{
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	CHttpEventHandler* me = NewLC(aClient, aCallbacks, aFs);
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	CleanupStack::Pop(me);
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	return me;
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	}
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void CHttpEventHandler::MHFRunL(RHTTPTransaction aTransaction, const THTTPEvent& aEvent)
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	{
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	switch (aEvent.iStatus)
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		{
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		case THTTPEvent::EGotResponseHeaders:
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			{
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			// HTTP response headers have been received. We can determine now if there is
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			// going to be a response body to save.
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			RHTTPResponse resp = aTransaction.Response();
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			iLastStatusCode = resp.StatusCode();
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			RStringF statusStr = resp.StatusText();
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			TBuf<32> statusStr16;
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			statusStr16.Copy(statusStr.DesC());
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			DP2("Status: %d (%S)", iLastStatusCode, &statusStr16);
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			// Dump the headers if we're being verbose
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			//DumpRespHeadersL(aTransaction);
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			// Determine if the body will be saved to disk
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			iSavingResponseBody = ETrue;
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			TBool cancelling = EFalse;
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			if (resp.HasBody() && (iLastStatusCode >= 200) && (iLastStatusCode < 300) && (iLastStatusCode != 204))
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				{
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				//iBytesDownloaded = 0;
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				TInt dataSize = resp.Body()->OverallDataSize();
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				if (dataSize >= 0) {
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					DP1("Response body size is %d", dataSize);
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					iBytesTotal = dataSize;	
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				} else {
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					DP("Response body size is unknown");
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					iBytesTotal = -1;
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				}
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				iCallbacks.DownloadInfo(iHttpClient, dataSize);
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				cancelling = EFalse;
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				}
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			// If we're cancelling, must do it now..
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			if (cancelling)
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				{
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				DP("Transaction Cancelled");
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				aTransaction.Close();
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				iHttpClient->ClientRequestCompleteL(KErrCancel);
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				}
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			else if (iSavingResponseBody) // If we're saving, then open a file handle for the new file
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				{
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				iFileServ.Parse(iFileName, iParsedFileName);
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				TInt valid = iFileServ.IsValidName(iFileName);
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				if (!valid)
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					{
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					DP("The specified filename is not valid!.");
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					iSavingResponseBody = EFalse;
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					iHttpClient->ClientRequestCompleteL(KErrBadName);
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					}
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				else
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					{
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					if (iContinue) {
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						TInt err = iRespBodyFile.Open(iFileServ, iParsedFileName.FullName(),EFileWrite);
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						if (err)
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							{
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							DP("There was an error opening file");
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							iSavingResponseBody = EFalse;
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							iHttpClient->ClientRequestCompleteL(KErrInUse);
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							User::Leave(err);
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							} 
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						else
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							{
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							int pos = -KByteOverlap;
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							if((err=iRespBodyFile.Seek(ESeekEnd, pos)) != KErrNone)
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								{
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								DP("Failed to set position!");
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								iHttpClient->ClientRequestCompleteL(KErrGeneral);
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								User::Leave(err);
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								}
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						iBytesDownloaded = (pos > 0) ? pos : 0;
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						iBytesTotal += iBytesDownloaded;
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						DP1("Total bytes is now %u", iBytesTotal);
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						DP1("Seeking end: %d", pos);
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							}
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						}
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					else 
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						{
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						TInt err = iRespBodyFile.Replace(iFileServ,
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														 iParsedFileName.FullName(),
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														 EFileWrite);
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						if (err)
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							{
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							DP("There was an error replacing file");
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							iSavingResponseBody = EFalse;
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							User::Leave(err);
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							}
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						}
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					}
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				}
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			} break;
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		case THTTPEvent::EGotResponseBodyData:
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			{
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			// Get the body data supplier
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			iRespBody = aTransaction.Response().Body();
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			// Some (more) body data has been received (in the HTTP response)
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			//DumpRespBody(aTransaction);
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			//DP1("Saving: %d", iSavingResponseBody);
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			// Append to the output file if we're saving responses
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			if (iSavingResponseBody)
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				{
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				TPtrC8 bodyData;
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				iRespBody->GetNextDataPart(bodyData);
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				iBytesDownloaded += bodyData.Length();
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				TInt error = iRespBodyFile.Write(bodyData);
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				// on writing error we close connection 
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				if (error != KErrNone) {
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					iRespBodyFile.Close();
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					iCallbacks.FileError(error);
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					iHttpClient->ClientRequestCompleteL(error);
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					return;
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				}
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				if (!iSilent) {
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					iCallbacks.Progress(iHttpClient, iBytesDownloaded, iBytesTotal);
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				}
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				}
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			// Done with that bit of body data
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			iRespBody->ReleaseData();
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			} break;
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		case THTTPEvent::EResponseComplete:
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			{
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			// The transaction's response is complete
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			DP("Transaction Complete");
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			DP("Closing file");
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			iRespBodyFile.Close();
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			} break;
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		case THTTPEvent::ESucceeded:
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			{
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			DP("Transaction Successful");
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			aTransaction.Close();
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			iHttpClient->ClientRequestCompleteL(KErrNone);
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			} break;
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		case THTTPEvent::EFailed:
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			{
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			DP("Transaction Failed");
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			aTransaction.Close();
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//			if(iLastStatusCode == HTTPStatus::EOk || iLastStatusCode == HTTPStatus::ECreated || iLastStatusCode == HTTPStatus::EAccepted)
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//				{
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//				iLastStatusCode = KErrNone;
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//				}
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			iHttpClient->ClientRequestCompleteL(KErrGeneral);
2
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			} break;
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		case THTTPEvent::ERedirectedPermanently:
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			{
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			DP("Permanent Redirection");
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			} break;
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		case THTTPEvent::ERedirectedTemporarily:
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			{
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			DP("Temporary Redirection");
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			} break;
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		default:
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			{
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			DP1("<unrecognised event: %d>", aEvent.iStatus);
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			// close off the transaction if it's an error
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			if (aEvent.iStatus < 0)
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				{
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				aTransaction.Close();
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				iHttpClient->ClientRequestCompleteL(aEvent.iStatus);
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				}
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			} break;
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		}
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	}
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TInt CHttpEventHandler::MHFRunError(TInt aError, RHTTPTransaction /*aTransaction*/, const THTTPEvent& /*aEvent*/)
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	{
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	DP1("MHFRunError fired with error code %d", aError);
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	iHttpClient->ClientRequestCompleteL(aError);
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	return KErrNone;
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	}
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void CHttpEventHandler::SetSaveFileName(const TDesC &fName, TBool aContinue)
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	{
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	iFileName.Copy(fName);
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	iContinue = aContinue;
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	}
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void CHttpEventHandler::DumpRespHeadersL(RHTTPTransaction& aTrans)
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	{
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	RHTTPResponse resp = aTrans.Response();
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	RStringPool strP = aTrans.Session().StringPool();
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	RHTTPHeaders hdr = resp.GetHeaderCollection();
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	THTTPHdrFieldIter it = hdr.Fields();
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	TBuf<KMaxHeaderNameLen>  fieldName16;
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	TBuf<KMaxHeaderValueLen> fieldVal16;
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	while (it.AtEnd() == EFalse)
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		{
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		RStringTokenF fieldName = it();
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		RStringF fieldNameStr = strP.StringF(fieldName);
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		THTTPHdrVal fieldVal;
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		if (hdr.GetField(fieldNameStr,0,fieldVal) == KErrNone)
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			{
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			const TDesC8& fieldNameDesC = fieldNameStr.DesC();
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			fieldName16.Copy(fieldNameDesC.Left(KMaxHeaderNameLen));
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			switch (fieldVal.Type())
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				{
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			case THTTPHdrVal::KTIntVal:
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				DP2("%S: %d", &fieldName16, fieldVal.Int());
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				break;
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			case THTTPHdrVal::KStrFVal:
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				{
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				RStringF fieldValStr = strP.StringF(fieldVal.StrF());
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				const TDesC8& fieldValDesC = fieldValStr.DesC();
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				fieldVal16.Copy(fieldValDesC.Left(KMaxHeaderValueLen));
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				DP2("%S: %S", &fieldName16, &fieldVal16);
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   277
				}
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				break;
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   279
			case THTTPHdrVal::KStrVal:
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   280
				{
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   281
				RString fieldValStr = strP.String(fieldVal.Str());
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   282
				const TDesC8& fieldValDesC = fieldValStr.DesC();
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   283
				fieldVal16.Copy(fieldValDesC.Left(KMaxHeaderValueLen));
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   284
				DP2("%S: %S", &fieldName16, &fieldVal16);
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   285
				}
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   286
				break;
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   287
			case THTTPHdrVal::KDateVal:
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   288
				{
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   289
				TDateTime date = fieldVal.DateTime();
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   290
				} 
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   291
				break;
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   292
			default:
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   293
				DP1("%S: <unrecognised value type>", &fieldName16);
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   294
				break;
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   295
				}
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   296
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   297
			// Display realm for WWW-Authenticate header
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   298
			RStringF wwwAuth = strP.StringF(HTTP::EWWWAuthenticate,RHTTPSession::GetTable());
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   299
			if (fieldNameStr == wwwAuth)
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   300
				{
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   301
				// check the auth scheme is 'basic'
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				RStringF basic = strP.StringF(HTTP::EBasic,RHTTPSession::GetTable());
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   303
				RStringF realm = strP.StringF(HTTP::ERealm,RHTTPSession::GetTable());
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   304
				THTTPHdrVal realmVal;
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   305
				if ((fieldVal.StrF() == basic) && 
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   306
					(!hdr.GetParam(wwwAuth, realm, realmVal)))
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   307
					{
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   308
					RStringF realmValStr = strP.StringF(realmVal.StrF());
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   309
					fieldVal16.Copy(realmValStr.DesC());
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   310
					DP1("Realm is: %S", &fieldVal16);
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   311
					}
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   312
				}
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   313
			}
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		++it;
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   315
		}
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   316
	}
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   317
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void CHttpEventHandler::DumpRespBody(RHTTPTransaction& aTrans)
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   319
	{
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   320
	MHTTPDataSupplier* body = aTrans.Response().Body();
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   321
	TPtrC8 dataChunk;
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   322
	TBool isLast = body->GetNextDataPart(dataChunk);
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   323
	DumpIt(dataChunk);
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   324
	if (isLast)
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   325
		DP("Got last data chunk.");
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   326
	}
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   327
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   328
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   329
void CHttpEventHandler::DumpIt(const TDesC8& aData)
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   330
//Do a formatted dump of binary data
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   331
	{
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   332
	// Iterate the supplied block of data in blocks of cols=80 bytes
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   333
	const TInt cols=16;
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   334
	TInt pos = 0;
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   335
	TBuf<KMaxFileName - 2> logLine;
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   336
	TBuf<KMaxFileName - 2> anEntry;
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	const TInt dataLength = aData.Length();
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	while (pos < dataLength)
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		{
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		//start-line hexadecimal( a 4 digit number)
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		anEntry.Format(TRefByValue<const TDesC>_L("%04x : "), pos);
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		logLine.Append(anEntry);
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		// Hex output
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		TInt offset;
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		for (offset = 0; offset < cols; ++offset)
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			{
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			if (pos + offset < aData.Length())
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				{
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				TInt nextByte = aData[pos + offset];
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				anEntry.Format(TRefByValue<const TDesC>_L("%02x "), nextByte);
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				logLine.Append(anEntry);
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				}
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			else
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				{
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				//fill the remaining spaces with blanks untill the cols-th Hex number 
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				anEntry.Format(TRefByValue<const TDesC>_L("   "));
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				logLine.Append(anEntry);
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				}
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			}
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			anEntry.Format(TRefByValue<const TDesC>_L(": "));
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			logLine.Append(anEntry);
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   364
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		// Char output
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		for (offset = 0; offset < cols; ++offset)
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			{
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			if (pos + offset < aData.Length())
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   369
				{
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				TInt nextByte = aData[pos + offset];
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				if ((nextByte >= ' ') && (nextByte <= '~'))
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   372
					{
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					anEntry.Format(TRefByValue<const TDesC>_L("%c"), nextByte);
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					logLine.Append(anEntry);
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					}
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				else
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					{
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					anEntry.Format(TRefByValue<const TDesC>_L("."));
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					logLine.Append(anEntry);
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					}
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				}
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			else
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   383
				{
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   384
				anEntry.Format(TRefByValue<const TDesC>_L(" "));
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				logLine.Append(anEntry);
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   386
				}
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   387
			}
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			logLine.Zero();
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   389
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		// Advance to next  byte segment (1 seg= cols)
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   391
		pos += cols;
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   392
		}
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   393
	}
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   394
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   395
void CHttpEventHandler::SetSilent(TBool aSilent)
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   396
	{
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   397
	iSilent = aSilent;
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   398
	}
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   399
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   400
void CHttpEventHandler::CloseSaveFile()
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   401
{
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   402
	if(iRespBody != NULL)
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diff changeset
   403
	{		
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   404
		if(iRespBodyFile.SubSessionHandle() != 0)
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   405
			{
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   406
			TInt size;
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   407
			iRespBodyFile.Size(size);
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   408
			DP2("Closing file at size %d, bytes downloaded %d", size, iBytesDownloaded);
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   409
			iRespBodyFile.Close();
29cda98b007e Initial import of Podcatcher from the Bergamot project
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diff changeset
   410
			}
29cda98b007e Initial import of Podcatcher from the Bergamot project
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   411
	}
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   412
}
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   413