applayerprotocols/httptransportfw/httpmessage/rhttpmessageparser.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 09 Jun 2010 10:16:57 +0300
branchRCL_3
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parent 0 b16258d2340f
permissions -rw-r--r--
Revision: 201019 Kit: 2010123
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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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#ifndef __RHTTPMESSAGEPARSER_H__
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#define __RHTTPMESSAGEPARSER_H__
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#include <e32base.h>
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class CHttpMessageParser;
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class MHttpMessageParserObserver;
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class RHttpMessageParser
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/**
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The RHttpMessageParser class provides parsing functionality for HTTP/1.1 
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messages as defined in RFC2616. The HTTP/1.1 protocol specifies that the CR
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LF sequence is the end of line (eol) marker for all protocol elements except
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the entity-body. The parser tolerates some deviation from this, as the RFC
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recommends in section 19.3 - a LF without the leading CR can also be parsed
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as an eol marker.
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The parser does not process any header fields. Therefore it needs to be told
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if an entity body is expected. If one is then the parser needs to know if it
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is chunk-encoded and if not what the expected size is.
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With a chunked entity body the parser de-chunks the body data - the observer
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does not need to parse a chunked body.
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The parser needs an observer (MHttpMessageParserObserver). The observer 
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supplies the buffers containing the unparsed http message data. The observer
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must ensure that the buffers it supplies to the parser remain valid until the
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parser notifies it that it has parsed the entire contents of that buffer.
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The parser is initially in the Idle state waiting to be notified of available
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meesage data. When it is notified, the parser obtains the data and moves
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into the ParsingStartLine state.
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Whichever state it is in, the parser will notify the observer when it has
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parsed the entire contents of the current data buffer. It will then wait to
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be told that there is more data available. When it has been given the next 
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part of the message data it continues parsing.
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In the ParsingStartLine state the parser looks for the first eol marker. 
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This delimits the start-line. Once found the observer is notified and the
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parser moves into the ParsingHeaders state.
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In the ParsingHeaders state the parser searches for header field lines. 
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These lines are delimited by eol markers. In HTTP/1.1 it is possible to fold
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header field values over multiple lines if the continuation line is followed
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by a SP or HT. In this case the eol marker is part of LWS and is ignored. 
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Also any eol markers that are part of LWS are omitted from the header field
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data given to the observer.
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The header field section is completed once an empty line is parsed. The
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observer is informed and it should supply the parser with the necessary
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info about the entity body. If no entity body is expected then the parser 
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moves to the MessageComplete state. If a non-encoded entity body is expected
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then the parser moves to the ReadingBodyData state. If a chunk-encoded 
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entity body is expected then the parser moves to the ParsingChunkSize state.
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In the ReadingBodyData state the parser extracts the specified length of 
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entity body data. The observer is notified of each chunk body data parsed. 
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It is possible for the entity body data to be received in several parts due
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to segmentation at the transport layer, Once all the entity body data has 
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been received the parser notifies the observer that the entity body is 
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complete. The parser moves to MessageComplete state.
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Note that although the parser will have notified the obserer that it has 
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finished with the current data packet that held some entity body data, the
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observer should only release that data packet once it itself has no more use
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for the entity body data it has been given. Failure to do this will result
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in the buffer containing the received entity body chunks being invalid. The
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same is true when receiving a chunked entity body.
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In the ParsingChunkSize the parser searches for a chunk-size component as 
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defined in RFC2616 section 3.6.1. The chunk-size component is delimited by
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an eol marker. An optional chunk-extension component can be present between
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the chunk-size and the eol marker - the parser will ignore any 
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chunk-extension components. The chunk-size is a hex number specifying the 
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size of the subsequent chunk-data component. A chunk-size of value zero 
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indicates a last-chunk token - there are no subsequent chunk-data components
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and the parser moves to the ParsingTrailerHeaders state. A chunk-size of any
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other value indicates a subsequent chunk-data component and the parser moves
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to the ParsingChunkData state.
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In the ParsingChunkData state the parser extracts the length of entity body
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data specified in the preceeding chunk-size component. The observer is 
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notified of each chunk of entity body data. Note that a chunk-data component
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can be segmented in the transport layer resulting in the observer being 
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notified more than once for a given chunk-data component. The observer will
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not notice any disparate behaviour between receiving an entity body that has 
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not been chunk-encoded and one that has. Once the entire chunk-data has been 
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received the parser moves to the ParsingChunkSize state.
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The ParsingTrailerHeaders state is very similar to the ParsingHeaders state.
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The observer is notified of each header field and the trailer headers 
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section is delimited by an empty line. The observer is notified of the end
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of the trailer headers section and the parser moves to MessageComplete state.
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In the MessageComplete state the parser notifies the observer that the
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message is complete. The observer is presented with any remaining data in 
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the current data packet. This can be either excess data indicating a mal-
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formed message or the start of a pipelined message. In either case if the 
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observer wishes to use that data it must not release the current data packet
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as that will invalidate the data.
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@see		MHttpMessageParserObserver
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*/
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	{
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public:	// methods
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	inline RHttpMessageParser();
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	IMPORT_C void OpenL(MHttpMessageParserObserver& aObserver);
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	IMPORT_C void Close();
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	IMPORT_C void ReceivedMessageData();
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	IMPORT_C void CompletedBodyDataL();
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	IMPORT_C void Reset();
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	IMPORT_C void Flush ();
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	IMPORT_C TBool CompleteMessage ( const TDesC8& aData );
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private:	// methods
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	IMPORT_C void Reserved_RHttpMessageParser();
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private:	// attributes
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	CHttpMessageParser*		iImplementation;
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	};
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inline RHttpMessageParser::RHttpMessageParser()
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: iImplementation(NULL)
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	{
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	}
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#endif // __RHTTPMESSAGEPARSER_H__