httpfileobj.h
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef _HTTPFILEOBJ_H_
- #define _HTTPFILEOBJ_H_
- /****************************************************************************
- * Includes
- */
- #include "hxcom.h"
- #include "hxfiles.h" // IHXFileObject, IHXRequestHandler, etc.
- #include "hxcache2.h" // IHXCache2, IHXCacheObject, IHXCacheObjectResponse
- #include "hxengin.h" // IHXTCPResponse, IHXTCPSocket, IHXNetworkServices
- #include "hxbuffer.h"
- #include "hxurl.h" // CHXURL
- #include "memcache.h" // uses only memory
- #ifdef HELIX_FEATURE_HTTP_FILECACHE // Create a file cache object
- #include "filecache.h" // uses filesystem + memory
- #endif
- /****************************************************************************
- *
- * CHXHTTPFileObject Class
- *
- * This class inherits the interfaces required to create a File Object,
- * which is used by the File System plug-in to handle file I/O. This class
- * implements the IHXFileObject interface which handles the actual low
- * level file access. The IHXRequestHandler interface is used to obtain
- * the requested URL; while the IHXFileExists interface determines if the
- * requested file actually exists. Since we are using COM, this class also
- * inherits COM's IUnknown interface to handle reference counting and
- * interface query.
- */
- class CHXHTTPFileObject : public IHXFileObject,
- public IHXRequestHandler,
- public IHXFileStat,
- public IHXCacheObjectResponse,
- public IHXTCPResponse,
- public IHXCallback
- {
- public:
- CHXHTTPFileObject(IUnknown* pContext, IHXValues* pOptions);
- ~CHXHTTPFileObject(void);
- /************************************************************************
- * IHXFileObject Interface Methods
- */
- STDMETHOD(Init ) (THIS_ UINT32 access,IHXFileResponse* pFileResp);
- STDMETHOD(GetFilename) (THIS_ REF(const char*) pFileName);
- STDMETHOD(Read ) (THIS_ UINT32 byteCount);
- STDMETHOD(Write ) (THIS_ IHXBuffer* pDataToWrite);
- STDMETHOD(Seek ) (THIS_ UINT32 offset, BOOL bRelative);
- STDMETHOD(Advise ) (THIS_ UINT32 useage);
- STDMETHOD(Close ) (THIS);
- /************************************************************************
- * IHXRequestHandler Interface Methods
- */
- STDMETHOD(SetRequest) (THIS_ IHXRequest* pRequest);
- STDMETHOD(GetRequest) (THIS_ REF(IHXRequest*) pRequest);
- /************************************************************************
- * IUnknown COM Interface Methods
- */
- STDMETHOD (QueryInterface ) (THIS_ REFIID ID, void** ppInterfaceObj);
- STDMETHOD_(UINT32, AddRef ) (THIS);
- STDMETHOD_(UINT32, Release) (THIS);
- /************************************************************************
- * IHXFileStat Interface Methods
- */
- STDMETHOD(Stat)(THIS_ IHXFileStatResponse* pFileStatResponse);
- /************************************************************************
- * IHXCacheObjectResponse methods
- */
- STDMETHOD(InitDone) (THIS_
- HX_RESULT /*IN*/ status);
- STDMETHOD(ChangeCapacityDone) (THIS_
- HX_RESULT /*IN*/ status);
- STDMETHOD(AddBlockDone) (THIS_
- HX_RESULT /*IN*/ status);
- STDMETHOD(VerifyBlockDone) (THIS_
- BOOL /*IN*/ bExist);
- STDMETHOD(ReadBlockDone) (THIS_
- HX_RESULT /*IN*/ status,
- IHXBuffer* /*IN*/ pBuffer);
- STDMETHOD(FlushDone) (THIS_
- HX_RESULT /*IN*/ status);
- /************************************************************************
- * IHXTCPResponse methods
- */
- STDMETHOD(ConnectDone) (THIS_
- HX_RESULT status);
-
- STDMETHOD(ReadDone) (THIS_
- HX_RESULT status,
- IHXBuffer* pBuffer);
- STDMETHOD(WriteReady) (THIS_
- HX_RESULT status);
- STDMETHOD(Closed) (THIS_
- HX_RESULT status);
- /************************************************************************
- * IHXCallback methods
- */
- STDMETHOD(Func) (THIS);
- private:
- // The struct used to represent chunks of HTTP header as
- // they arrive. The chunks are consolidated after the
- // last header chunk arrives.
- struct HdrChunk
- {
- IHXBuffer* pPartOfHdr;
- HdrChunk* next;
- };
- // If a read can't be fully satisfied by the cache, a buffer
- // is created for it and is filled in installments. Information
- // for the pnding read, such as where to start reading for the next
- // installment, where to write in the pending read buffer, etc is
- // stored in this struct.
- struct PendingReadInfo
- {
- UINT32 ulWriteOffset; // Where to start writing in the buffer
- UINT32 ulReadOffset; // From where should the next installment begin.
- UINT32 ulSize; // Size left to be read
- IHXBuffer* pPendingReadBuff;// The buffer to be filled
- } m_pPendingReadInfo;
- /****** Private Class Variables ****************************************/
- INT32 m_RefCount; // Object's reference count
- IUnknown* m_pContext;
- IHXValues* m_pOptions;
- IHXCommonClassFactory* m_pClassFactory; // Creates common classes
- IHXFileResponse* m_pFileResponse; // Provides completion notif.
- IHXRequest* m_pRequest; // Used to get requested URL
- IHXCacheObject* m_pCache; // Non-persistent cache object
- IHXTCPSocket* m_pSocket; // Socket used to connect to the HTTP server
- CHXURL* m_pCHXURL; // URL parser
- UINT32 m_ulCurrentReadOffset; // Offset to be used for the next read
- int m_lNewReadOffset; // Offset requested by Seek()
- BOOL m_bInSeekDone;
- BOOL m_bInReadDone;
- BOOL m_bReadPending; // Is a read pending?
- BOOL m_bIncompleteReadPending; // A read was only partially satisfied by the cache.
- // Need to read in installments from the cache.
- UINT32 m_ulFileLength; // The Content-Length returned in HTTP header
- HdrChunk* m_pHdrListRoot; // List for storing the header chunks
- BOOL m_bHeaderCompletelyRead;// Has the HTTP header been completely read?
- CHXBuffer* m_pHeader; // The HTTP Header
- BOOL m_bStartAllOverAgain; // A backward seek failed. Start all over again.
- IHXScheduler* m_pScheduler; // For scheduling callbacks.
- UINT32 m_ulCallbackHandle;
- UINT32 m_ulCallBackInterval; // millisec
- BOOL m_bFirstChunk; // Is it the first chunk of TCP data we got from the n/w service?
- BOOL m_bInitResponsePending; // Init() is completed. Call InitDone() on fileformat obj
- BOOL m_bInitialized; // Has been already initialized
- UINT32 m_ulFileDataRead; // How much of the file has been read
- BOOL m_bAddBlockPending; // A block was previously rejected by cache. Add it when
- // cache becomes free again.
- IHXBuffer* m_pPendingAddBlock; // The block which was rejected by cache
- BOOL m_bDisconnected;
-
- /****** Private Class Methods ******************************************/
- STDMETHOD(_CleanUp) (THIS); // Called by Close() and destructor
- STDMETHOD(_Start) (THIS); // Starts connecting to server
- // Retrives cache preferences like "whether to cache or not",
- // "where to cache", etc which are set by the user.
- STDMETHOD(_GetCachePreferences) (THIS_
- REF(BOOL) /*OUT*/ bCacheEnabled,
- REF(char *) /*OUT*/ pCacheFile);
- STDMETHOD(_PrepareHTTP10GetMessage) (THIS_
- REF(char *) /*OUT*/ pGetMsg,
- REF(UINT32) /*OUT*/ ulMsgLen);
-
-
- };
- #endif /* _HTTPFILEOBJ_H_ */