hxbufdataf.cpp

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/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxbufdataf.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
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 * 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
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 * ENJOYMENT OR NON-INFRINGEMENT.
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 * ***** END LICENSE BLOCK ***** */

#include "hlxclib/sys/types.h"
#include "hlxclib/sys/stat.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 "hxbufdataf.h"

#include "op_fs.h"

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

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

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

HXBufferedDataFile::HXBufferedDataFile()
    : 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();
}

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

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

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     HXBufferedDataFile::Create
// Purpose:
//     Creates a datafile using the specified mode
//     uOpenMode - File Open mode - HX_FILEFLAG_READ/HX_FILEFLAG_WRITE/HX_FILEFLAG_BINARY
//
STDMETHODIMP
HXBufferedDataFile::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
HXBufferedDataFile::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)
    {
	int oflags = 0;

	m_Flags = flags;
	m_LastError = 0;
	if (m_Flags & HX_FILEFLAG_WRITE)
	{
	    oflags = (O_CREAT|O_RDWR);
	    if (!(m_Flags & HX_FILEFLAG_NOTRUNC))
	    {
		oflags |= O_TRUNC;
	    }
	}
	else if (m_Flags & HX_FILEFLAG_READ)
	    oflags = O_RDONLY;
	else
	    return HXR_FAIL;

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

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     HXBufferedDataFile::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
HXBufferedDataFile::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:
//     HXBufferedDataFile::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)
HXBufferedDataFile::Name(REF(IHXBuffer*) pFileName)
{
    if (m_pFileName && m_pFileName->GetSize())
    {
	pFileName = m_pFileName;
	pFileName->AddRef();
	return TRUE;
    }
    return FALSE;
}

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

/////////////////////////////////////////////////////////////////////////
//
// Method
//     HXBufferedDataFile::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
HXBufferedDataFile::Seek(ULONG32 offset, UINT16 whense)
{
    ULONG32 size = 0;
    LONG32 signed_offset = (LONG32) offset;

    if (whense == SEEK_SET && signed_offset >= 0)
	m_Offset = signed_offset;
    else if (whense == SEEK_CUR && (LONG32) m_Offset + signed_offset >= 0)
	m_Offset += signed_offset;
    else if (whense == SEEK_END &&
	     (LONG32) (size = LogicalSize()) + signed_offset >= 0)
	m_Offset = size + signed_offset;
    else
	return HXR_FAIL;

    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     HXBufferedDataFile::Tell()
// Purpose:
//      Tell returns the current (logical) file position in the file
//
STDMETHODIMP_(ULONG32)
HXBufferedDataFile::Tell()
{
    return m_Offset;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     HXBufferedDataFile::Read:
// Purpose
//     Read nbytes into the supplied buffer.  Values returned:
//
//        Actual bytes read.  The smaller of the number bytes requested
//        and  the number of bytes between the current seek offset and the
//        end of file is returned.
//
//        0, if the current seek pointer is at or beyond the end of file.
//      
//        -1, if errors occure.  The LastError() member function returns
//        the errno of the last system request.
//
STDMETHODIMP_(ULONG32)
HXBufferedDataFile::Read(REF(IHXBuffer *) pBuf, ULONG32 count)
{
    if (m_Fd >= 0)
    {
	pBuf->AddRef();

	ULONG32 nleft = count;
	INT32 rval = 0;
	unsigned char* buf = pBuf->GetBuffer();
	while (nleft > 0)
	{
				// If we enter this block, m_Offset
				// lies within the mapped buffer.
	    if (m_Begin <= m_Offset && m_Offset < m_Begin + m_BufFill ||
		(m_Offset < FlushSize() && (rval = NewBuf()) > 0))
	    {
		UINT32 off = m_Offset - m_Begin;  // offset within buffer
						 // and how much to copy
		UINT32 ncopy = m_Begin + m_BufFill - m_Offset;
		if (nleft < ncopy)
		    ncopy = nleft;
		::memcpy((void*) buf, (const void*) (m_pBuf+off), ncopy); /* Flawfinder: ignore */
		nleft -= ncopy;
		m_Offset += ncopy;
		buf += ncopy;
	    }
				// NewBuf() could not make the above
				// assertion, true.  m_Offset is either
				// at or beyond EOF, or an error occured.
	    else
		break;
	}
	pBuf->Release();
	return rval >= 0 ? count - nleft : HXR_FAIL;
    }
    return HXR_FAIL;
}

/////////////////////////////////////////////////////////////////////////
//
// Method:
//     HXBufferedDataFile::Write:
// Purpose:
//      Write the requested number of bytes.  The number of bytes