opwavehxdataf.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: opwavehxdataf.cpp,v 1.1.32.3 2004/07/09 01:44:17 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 ***** */

#include "hlxclib/sys/types.h"
#include "hlxclib/sys/stat.h"
//#include <unistd.h>
#include "hlxclib/fcntl.h"
#include "hlxclib/errno.h"

#include "hxtypes.h"
#include "hxcom.h"
#include "hxresult.h"
#include "ihxpckts.h"
#include "hxbuffer.h"
#include "debug.h"

#include "opwavehxdataf.h"

#include "op_fs.h"

/////////////////////////////////////////////////////////////////////////
//
//  Method:
//      OpenwaveHXDataFile::QueryInterface
//  Purpose:
//      Implement this to export the interfaces supported by your
//      object.
//
STDMETHODIMP
OpenwaveHXDataFile::QueryInterface(REFIID riid, void** ppvObj)
{
    if (IsEqualIID(riid, IID_IHXDataFile))
    {
        AddRef();
        *ppvObj = (IHXDataFile*)this;
        return HXR_OK;
    }
    
    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}   

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

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

OpenwaveHXDataFile::OpenwaveHXDataFile(IUnknown** ppCommonObj)
    : m_ulPos(0),
	  m_lRefCount(0),
      m_LastError(0),
      m_pFileName(0),
      m_Fd(-1),
      m_Flags(0),
      m_Begin(0),
      m_BufSize(0),
      m_BufFill(0),
      m_Offset(0),
      m_FileOffset(0),
      m_FlushSize(0),
      m_pBuf(0),
      m_Dirty(0)
{
    m_pFileName = new CHXBuffer;
    m_pFileName->AddRef();
    m_BufSize = GetPageSize();
}

OpenwaveHXDataFile::~OpenwaveHXDataFile()
{
    Close();
    FreeBuf();
    HX_RELEASE(m_pFileName);
}
	
/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Bind:
// Purpose:
//     Cache the file name for opening.
//     If file already open, close it.
//
STDMETHODIMP_(void)
OpenwaveHXDataFile::Bind(const char* pFileName)
{
    if (m_Fd >= 0)
		Close();

    m_pFileName->Set((BYTE *)pFileName, ::strlen(pFileName)+1);
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Create
// Purpose:
//     Creates a datafile using the specified mode
//     uOpenMode - File Open mode - HX_FILEFLAG_READ/HX_FILEFLAG_WRITE/HX_FILEFLAG_BINARY
//
STDMETHODIMP
OpenwaveHXDataFile::Create(UINT16 uOpenMode)
{
    return HXR_NOTIMPL;
}

/////////////////////////////////////////////////////////////////////////
//
//  Method:
//      HXBufferedDatatFile::Open
//  Purpose:
//      Open for buffered i/o.  If file is already open, ignore this
//      open and return HXR_OK status.  Flags can have 3 possible values
//	
//	   HX_FILEFLAG_READ:     Open file read only
//
//	   HX_FILEFLAG_WRITE:    Open file for writing.  If file does not
//			     exists, it is created.
//
//	   HX_FILEFLAG_READ|HX_FILEFLAG_WRITE:                
//                           Open file for both read and writing.
//
//  Note:
//      HX_FILEFLAG_WRITE implies both reads and writes to the file.  It
//      also implies the file can be randomly updated any where in the
//      file as well as appended onto the end. If the file exists,
//      then the file contents are buffered in before updating.  As a
//      result, writing implies both system reads and writes.
//
//      If open succeeds, returns HXR_OK, otherwise HXR_FAIL.
//
STDMETHODIMP
OpenwaveHXDataFile::Open(UINT16 flags)
{
				// flags don't match close and reopen
    if (m_Fd >= 0 && flags != m_Flags)
    {
		Close();
    }
    int status = HXR_OK;
    if (m_Fd < 0)
    {
		OpFsFlags oflags = 0;

		m_Flags = flags;
		m_LastError = 0;
		if (m_Flags & HX_FILEFLAG_WRITE)
		{
			oflags = (kOpFsFlagCreate|kOpFsFlagRdwr);
			if (!(m_Flags & HX_FILEFLAG_NOTRUNC))
			{
				oflags |= kOpFsFlagRdwr;
			}
		}
		else if (m_Flags & HX_FILEFLAG_READ)
			oflags = kOpFsFlagRdOnly;
		else
			return HXR_FAIL;

		if ((m_Fd =
			//::open((const char*) m_pFileName->GetBuffer(), oflags, 0644)) < 0)
			OpFsOpen( (const char*) m_pFileName->GetBuffer(), oflags, 0644 )) == kOpFsErrAny)
		{
			status = HXR_FAIL;
			m_LastError = errno;
		}
		else			// open ok: initialize
		{
			if (m_pBuf == 0)
				AllocBuf();
			m_ulPos = 0;
			m_Begin = 0;
			m_BufFill = 0;
			m_Offset = 0;
			m_FileOffset = 0;
			m_FlushSize = 0;
			m_LastError = 0;
			m_Dirty = 0;
		}
    }
    return status;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Close:
//  Purpose:
//     Flush the file buffer (if open of writing and close the file.
//     Note that file is not closed when there are multiple references
//     to this object.
//
STDMETHODIMP
OpenwaveHXDataFile::Close()
{
    int status = HXR_OK;
    if (m_Fd >= 0 && m_lRefCount <= 1)
    {
		if (m_Flags & HX_FILEFLAG_WRITE)
		    FlushBuf();
		//if (::close(m_Fd) == -1)
		if (OpFsClose( m_Fd ) != kOpFsErrOk )
		{
		    status = HXR_FAIL;
		  m_LastError = errno;
		}
		m_Fd = -1;
    }
    return status;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Name
// Purpose:
//     Name returns the currently bound file name in FileName.
//     and returns TRUE, if the a name has been bound.  Otherwise
//     FALSE is returned.
//
STDMETHODIMP_(BOOL)
OpenwaveHXDataFile::Name(REF(IHXBuffer*) pFileName)
{
    if (m_pFileName && m_pFileName->GetSize())
    {
		pFileName = m_pFileName;
		pFileName->AddRef();
		return TRUE;
    }
    return FALSE;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::IsOpen()
// Purpose:
//     IsOpen returns TRUE if file is open.  Otherwise FALSE.
//
BOOL
OpenwaveHXDataFile::IsOpen()
{
    return (m_Fd >= 0 ? TRUE : FALSE);
}

/////////////////////////////////////////////////////////////////////////
//
// Method
//     OpenwaveHXDataFile::Seek:
// Purpose:
//     Just move the seek offset according to the value of whense.
//     This only sets the local idea of the current offset, no system
//     level seek is performed.  If seek is ok, the current value of
//     seek offset is returned.  Otherwise -1 is returned.
//
//     XXXBH:  24-Mar-99
//       Note that most of callers expect HXR_OK as return value, not
//       the current offset.  So the above comment is a noop.   Also
//       the offset is passed in as an unsigned, it should be signed to
//       allow seeks in both directions.  Right now we do the ugly cast.
//
STDMETHODIMP
OpenwaveHXDataFile::Seek(ULONG32 offset, UINT16 whense)
{
   
    m_LastError = 0;

    if (m_Fd > 0)
    {
		if (OpFsSeek( m_Fd, (OpFsSize)offset, (U8CPU)whense) == kOpFsErrAny)
		{
			m_LastError = errno;
			return HXR_INVALID_FILE;
		}
		return HXR_OK;
    }
	return HXR_INVALID_FILE;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Tell()
// Purpose:
//      Tell returns the current (logical) file position in the file
//
STDMETHODIMP_(ULONG32)
OpenwaveHXDataFile::Tell()
{
    INT32 offset = -1;
    if (m_Fd > 0)
    {
		m_LastError = kOpFsErrOk;
		
		// so we do this instead....
		if ((offset = (INT32)OpFsSeek( m_Fd, 0, kOpFsSeekCur)) == kOpFsErrAny)
		{
			m_LastError = kOpFsErrAny;
		}
    }
    return (ULONG32)offset;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Read:
// Purpose
// Read reads up to count bytes of data into buf.
// returns the number of bytes read, EOF, or -1 if the read failed 
//
STDMETHODIMP_(ULONG32)
OpenwaveHXDataFile::Read(REF(IHXBuffer *) pBuf, ULONG32 count)
{
	UINT32 ncnt = 0; 
	m_LastError = 0;
	pBuf = new CHXBuffer();
    pBuf->AddRef();
    pBuf->SetSize(count);

    if (m_Fd > 0)
    { 
		if ((int)(ncnt = OpFsRead(m_Fd, (void *)pBuf->GetBuffer(), count)) == kOpFsErrAny)
		{
			m_LastError = kOpFsErrAny;
			pBuf->Release();
			pBuf = NULL;
		
			/*
			 * XXX PM Have to return 0 here because it is unsigned
			 * return value.
			*/
			return 0;
		}
		else
		{
			m_ulPos += ncnt;
		}
		if (ncnt < count)
		{
			pBuf->SetSize(ncnt);
		}
    }

    return (ULONG32)ncnt;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     OpenwaveHXDataFile::Write:
// Purpose:
//      Write the requested number of bytes.  The number of bytes
//      written are return.  If errors occur, -1 is returned.  The
//      LastError() member function returns the value of errno from
//      the last system request.
//