servicediscoveryandcontrol/pnp/test/upnp/upnpmessage/inc/mhttpmessageparserobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:12:20 +0200
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// Copyright (c) 2008-2009 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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#ifndef __MHTTPMESSAGEPARSEROBSERVER_H__
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#define __MHTTPMESSAGEPARSEROBSERVER_H__
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#include <e32std.h>
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class MHttpMessageParserObserver
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/**	
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The MHttpMessageParserObserver class is the observer API for the http message
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parser. It allows the parser to notify its observer when it has found http
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message components, e.g. the start-line. 
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Also, the parser uses this API to obtain the data buffer containg http 
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message info. The observer is responsible for ensuring that the supplied 
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buffer remains valid until the parser notifies it that it has finished with
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the data.
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@see		RHttpMessageParser
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*/
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	{
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public:	// enums
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	enum TEntityBodyType
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/**	
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	The TEntityBodyType enumeration specifies the types of entity body. These 
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	are used when informing the parser of the entity body size.
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*/
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		{
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		/**	The entity body is chunk-encoded.
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		*/
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		EChunked		=		-2, 
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		/**	The size of the entity body is not known.
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		*/
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		EUnknown		=		-1,
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		/**	There is no entity body or the size is zero.
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		*/
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		ENoBody			=		0
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		};
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public:	// methods
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/**	
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	Obtain current data packet. The parser requires the data packet with the
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	current http message data. The observer must ensure that the buffer remains
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	valid until the parser releases the data.
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	@param		aData	An output argument set to the buffer containing the 
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						current http message data.
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*/
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	virtual void GetDataPacket(TPtrC8& aData) =0;
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/**
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	Current data is no longer needed. The parser has finished with the current
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	data buffer. The observer may release that buffer.
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*/
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	virtual void ReleaseDataPacket() =0;
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/**
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	The message start-line. The parser has found the message start-line. The 
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	observer is responsible for parsing it further as a request or status line.
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	The parser ensures that the buffer containing the start-line remains valid
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	for the duration of the call.
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*/
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	virtual void StartLineL(const TDesC8& aStartLine) =0;
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/**	
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	A header has been found. The parser has found a header field. Any header
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	values that were folded onto multiple lines have been merged into a single
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	line - any LWS between header values has been replaced by a SP or HT. Any
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	leading or trailing has been removed. Although, multiple SPs or HTs between
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	tokens in the field value have not been reduced to a single SP. The parser 
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	ensures that the buffers containing the field name and value remain valid
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	for the duration of the call. The observer is also notified of trailer 
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	header fields using this API.
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	@param		aFieldName		The header field name.
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	@param		aFieldValue		The header field value.
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*/
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	virtual void HeaderL(const TDesC8& aFieldName, TDesC8& aFieldValue) =0;
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/**	
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	Request the size of the entity body. The parser has found the empty line that
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	indicates the end of the header fields. The observer must indicate to the
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	parser the size of entity body. The are four cases - 
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		1) EChunked	- the entity is chunk-encoded.
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		2) EUnknown	- the enity body length is unknown.
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		3) ENoBody	- there is no entity body or the entity body length is zero.
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	The fourth case is a positive value (greater than zero) that indicates the 
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	expected number of bytes in the entity body.
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	@return		An integer value greater than zero indicating the number bytes in
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				the entity body. A value of EChunked indicates a chunked-body, 
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				EUnknown an unknown size and ENoBody indicates that there is no
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				entity body.
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*/
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	virtual TInt BodySizeL() =0;
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/**	
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	Entity body data. The parser has parsed entity body data. If the entity body
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	was chunk-encoded the parser has removed the encoding. The supplied buffer
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	contains just the body data and no encoding info. The parser does not do any
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	copying of entity body data. Therefore the supplied buffer remains valid 
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	until the observer releases it. The observer should not release the data 
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	until the parser has notified it that it has finished with the current data
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	packet.
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	@param		aData	The buffer containing the entity body data.
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*/
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	virtual void BodyChunkL(const TDesC8& aData) =0;
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/**	
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	The entity body has been parsed. The parser has parsed all of the entity 
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	body data.
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*/
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	virtual void BodyCompleteL() =0;
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/**
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	The message is complete. The parser has parsed the entire message. Any data
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	in the current buffer that is part of the parsed message is supplied in the
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	buffer argument. This data could be the start of the next message in the 
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	case where pipelining of requests has occurred.
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*/
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	virtual void MessageCompleteL(const TPtrC8& aExcessData) =0;
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/**
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	Error notifier. The parser has experienced an error. It has reset itself and
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	is no longer able to continue parsing the current message.
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	@param		aError	The error code.
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*/
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	virtual TInt HandleParserError(TInt aError) =0;
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private:	// methods
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/**	
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	Reserved function.
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*/
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//	virtual void Reserved_MHttpMessageParserObserver() =0;
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	};
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#endif	// __MHTTPMESSAGEPARSEROBSERVER_H__