datafsys.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: datafsys.cpp,v 1.5.24.1 2004/07/09 02:03:44 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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 ***** */

/****************************************************************************
 * 
 *
 *  Data File system RFC 2397 plugin for RealMedia
 *
 *   Some applications that use URLs also have a need to embed (small)
 *   media type data directly inline. This file system defines a new URL
 *   scheme that would work like 'immediate addressing'. 
 *  
 *     The URLs are of the form:
 *     
 *       data:[<mediatype>][;base64],<data>
 *
 *   The <mediatype> is an Internet media type specification (with
 *   optional parameters.) The appearance of ";base64" means that the data
 *   is encoded as base64. Without ";base64", the data (as a sequence of
 *   octets) is represented using ASCII encoding for octets inside the
 *   range of safe URL characters and using the standard %xx hex encoding
 *   of URLs for octets outside that range.  If <mediatype> is omitted, it
 *   defaults to text/plain;charset=US-ASCII.  
 *   
 *   As a shorthand, "text/plain" can be omitted but the charset parameter 
 *   supplied.  The "data:" URL scheme is only useful for short values. Note 
 *   that some applications that use URLs may impose a length limit; for
 *   example, URLs embedded within <A> anchors in HTML have a length limit
 *   determined by the SGML declaration for HTML [RFC1866]. The LITLEN
 *   (1024) limits the number of characters which can appear in a single
 *   attribute value literal, the ATTSPLEN (2100) limits the sum of all
 *   lengths of all attribute value specifications which appear in a tag,
 *   and the TAGLEN (2100) limits the overall length of a tag.
 *   The "data" URL scheme has no relative URL forms.
 *
 */

//#define INITGUID    1

#include "hxcom.h"
#include "hxtypes.h"
#include "datafsys.ver"

#include "hxcomm.h"
#include "hxplugn.h"
#include "hxfiles.h"
#include "ihxpckts.h"
#include "hxver.h"

#undef INITGUID

#include "hxstrutl.h"
#include "hxstring.h"
#include "datafsys.h"
#include "rtsputil.h"
#include "unkimp.h"
#include "baseobj.h"
#include "nestbuff.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static const char HX_THIS_FILE[] = __FILE__;
#endif

const char* DataFileSystem::zm_pDescription	= "RealNetworks RFC 2397 Data Scheme File System";
const char* DataFileSystem::zm_pCopyright	= HXVER_COPYRIGHT;
const char* DataFileSystem::zm_pMoreInfoURL	= HXVER_MOREINFO;
const char* DataFileSystem::zm_pShortName	= "pn-datafsys";
const char* DataFileSystem::zm_pProtocol	= "data";

int g_nRefCount_datafsys = 0;

const char tokenChars[] =
{       
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,1,0,1,
    0,0,1,1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,0,0,
    0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,1,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

/****************************************************************************
 * 
 *  Function:
 * 
 *	DataFileSystem::HXCreateInstance()
 * 
 *  Purpose:
 * 
 *	Function implemented by all plugin DLL's to create an instance of 
 *	any of the objects supported by the DLL. This method is similar to 
 *	Window's CoCreateInstance() in its purpose, except that it only 
 *	creates objects from this plugin DLL.
 *
 *	NOTE: Aggregation is never used. Therefore and outer unknown is
 *	not passed to this function, and you do not need to code for this
 *	situation.
 * 
 */
HX_RESULT STDAPICALLTYPE DataFileSystem::HXCreateInstance
(
    IUnknown**  /*OUT*/	ppIUnknown
)
{
    *ppIUnknown = (IUnknown*)(IHXPlugin*)new DataFileSystem();
    if (*ppIUnknown)
    {
	(*ppIUnknown)->AddRef();
	return HXR_OK;
    }
    return HXR_OUTOFMEMORY;
}

/****************************************************************************
 * 
 *  Function:
 * 
 *	DataFileSystem::CanUnload()
 * 
 *  Purpose:
 * 
 *	Function implemented by all plugin DLL's if it returns HXR_OK 
 *	then the pluginhandler can unload the DLL
 *
 */
HX_RESULT
DataFileSystem::CanUnload(void)
{
    return (g_nRefCount_datafsys ? HXR_FAIL : HXR_OK);
}

/****************************************************************************
 *
 *  Function:
 *
 *      DataFileSystem::HXShutdown()
 *
 *  Purpose:
 *
 *      Function implemented by all plugin DLL's to free any *global*
 *      resources. This method is called just before the DLL is unloaded.
 *
 */
HX_RESULT STDAPICALLTYPE DataFileSystem::HXShutdown(void)
{
    return HXR_OK;
}


DataFileSystem::DataFileSystem()
    : m_lRefCount(0)
    , m_pContext(0)
{
    ++g_nRefCount_datafsys;
}

DataFileSystem::~DataFileSystem()
{
    HX_RELEASE(m_pContext);
    --g_nRefCount_datafsys;
}

/************************************************************************
 *  Method:
 *    IHXPlugin::InitPlugin
 *  Purpose:
 *    Initializes the plugin for use. This interface must always be
 *    called before any other method is called. This is primarily needed 
 *    so that the plugin can have access to the context for creation of
 *    IHXBuffers and IMalloc.
 */
STDMETHODIMP DataFileSystem::InitPlugin(IUnknown* /*IN*/ pContext)
{
    if (pContext && !m_pContext)
    {
        m_pContext = pContext;
	m_pContext->AddRef();
    }

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *    IHXPlugin::GetPluginInfo
 *  Purpose:
 *    Returns the basic information about this plugin. Including:
 *
 *    unInterfaceCount	the number of standard RMA interfaces 
 *			supported by this plugin DLL.
 *    pIIDList		array of IID's for standard RMA interfaces
 *			supported by this plugin DLL.
 *    bLoadMultiple	whether or not this plugin DLL can be loaded
 *			multiple times. All File Formats must set
 *			this value to TRUE.
 *    pDescription	which is used in about UIs (can be NULL)
 *    pCopyright	which is used in about UIs (can be NULL)
 *    pMoreInfoURL	which is used in about UIs (can be NULL)
 */
STDMETHODIMP DataFileSystem::GetPluginInfo
(
    REF(BOOL)        /*OUT*/ bLoadMultiple,
    REF(const char*) /*OUT*/ pDescription,
    REF(const char*) /*OUT*/ pCopyright,
    REF(const char*) /*OUT*/ pMoreInfoURL,
    REF(ULONG32)     /*OUT*/ ulVersionNumber
)
{
    bLoadMultiple = TRUE;

    pDescription    = zm_pDescription;
    pCopyright	    = zm_pCopyright;
    pMoreInfoURL    = zm_pMoreInfoURL;
    ulVersionNumber = TARVER_ULONG32_VERSION;

    return HXR_OK;
}


// *** IUnknown methods ***

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::QueryInterface
//  Purpose:
//	Implement this to export the interfaces supported by your 
//	object.
//
STDMETHODIMP DataFileSystem::QueryInterface(REFIID riid, void** ppvObj)
{
    if (IsEqualIID(riid, IID_IUnknown))
    {
	AddRef();
	*ppvObj = this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXPlugin))
    {
	AddRef();
	*ppvObj = (IHXPlugin*)this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXFileSystemObject))
    {
	AddRef();
	*ppvObj = (IHXFileSystemObject*)this;
	return HXR_OK;
    }

    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::AddRef
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) DataFileSystem::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::Release
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) DataFileSystem::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}

STDMETHODIMP DataFileSystem::GetFileSystemInfo
(
    REF(const char*) /*OUT*/ pShortName,
    REF(const char*) /*OUT*/ pProtocol
)
{
    pShortName	= zm_pShortName;
    pProtocol	= zm_pProtocol;

    return HXR_OK;
}

STDMETHODIMP
DataFileSystem::InitFileSystem(IHXValues* options)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXFileSystemObject::CreateFile
//  Purpose:
//	TBD
//
STDMETHODIMP DataFileSystem::CreateFile
(
    IUnknown**	/*OUT*/	ppFileObject
)
{
    DataFileObject* pFileObj = 
	new DataFileObject(m_pContext);

    if (pFileObj)
    {
	if(HXR_OK == pFileObj->QueryInterface(IID_IUnknown,
					    (void**)ppFileObject))
	    return HXR_OK;
	return HXR_UNEXPECTED;
    }
    return HXR_OUTOFMEMORY;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	DataFileSystem::CreateDir
//  Purpose:
//	TBD
//
STDMETHODIMP DataFileSystem::CreateDir
(
    IUnknown**	/*OUT*/	ppDirObject
)
{
    return HXR_NOTIMPL;
}

DataFileObject::DataFileObject(IUnknown* pContext)
  : m_lRefCount(0)
  , m_pContext(pContext)
  , m_pRequest(NULL)
  , m_pClassFactory(NULL)
  , m_pFileResponse(NULL)
  , m_pDataURL(NULL)
  , m_ulFilePointer(0)
  , m_MediaType("text/plain;charset=US-ASCII")
{
    if (m_pContext)
    {
	m_pContext->AddRef();
    }

    m_pContext->QueryInterface(IID_IHXCommonClassFactory, 
	(void **)&m_pClassFactory);
}

DataFileObject::~DataFileObject()
{
    Close();
};


// *** IUnknown methods ***

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::QueryInterface
//  Purpose:
//	Implement this to export the interfaces supported by your 
//  	object.
//
STDMETHODIMP DataFileObject::QueryInterface(REFIID riid, void** ppvObj)
{
    if (IsEqualIID(riid, IID_IUnknown))
    {
	AddRef();
	*ppvObj = this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXFileObject))
    {
	AddRef();
	*ppvObj = (IHXFileObject*)this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXFileStat))
    {
	AddRef();
	*ppvObj = (IHXFileStat*)this;
	return HXR_OK;
    }
    else if (IsEqualIID(riid, IID_IHXFileExists))
    {
	AddRef();
	*ppvObj = (IHXFileExists*)this;
	return HXR_OK;
    }
    else if(IsEqualIID(riid, IID_IHXRequestHandler))
    {
	AddRef();
	*ppvObj = (IHXRequestHandler*)this;
	return HXR_OK;
    }
    else if(IsEqualIID(riid, IID_IHXFileMimeMapper))
    {
	AddRef();
	*ppvObj = (IHXFileMimeMapper*)this;
	return HXR_OK;
    }

    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::AddRef
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) DataFileObject::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IUnknown::Release
//  Purpose:
//	Everyone usually implements this the same... feel free to use
//	this implementation.
//
STDMETHODIMP_(ULONG32) DataFileObject::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
	return m_lRefCount;
    }

    delete this;
    return 0;
}

/************************************************************************
 *  Method:
 *	IHXFileObject::Init
 *  Purpose:
 *	Associates a file object with the file response object it should
 *	notify of operation completness. This method should also check
 *	for validity of the object (for example by opening it if it is
 *	a local file).
 */
STDMETHODIMP DataFileObject::Init
(
    ULONG32		/*IN*/	ulFlags,
    IHXFileResponse*   /*IN*/	pFileResponse
)
{
    if (!pFileResponse) return HXR_INVALID_PARAMETER;

    /* Release any previous reponses */
    if (m_pFileResponse)
    {
	m_pFileResponse->Release();
    }

    m_pFileResponse = pFileResponse;
    m_pFileResponse->AddRef();
    
    /* Reset our file pointer */
    m_ulFilePointer = 0;

    /*
     * We better have the IHXRequest object by now.
     */
    m_pFileResponse->InitDone(m_pRequest ? HXR_OK : HXR_FAIL);

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *      IHXFileObject::GetFilename
 *  Purpose:
 *      Returns the filename (without any path information) associated
 *      with a file object.
 */
STDMETHODIMP DataFileObject::GetFilename
(
    REF(const char*) /*OUT*/ pFilename
)
{
    pFilename = NULL;
    return HXR_UNEXPECTED;
}

/************************************************************************
 *  Method:
 *	IHXFileObject::Close
 *  Purpose:
 *	Closes the file resource and releases all resources associated
 *	with the object.
 */
STDMETHODIMP DataFileObject::Close()
{
    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pClassFactory);
    HX_RELEASE(m_pRequest);
    HX_RELEASE(m_pDataURL);