littobig.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** 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 ***** */ 

#include "littobig.h"
#include "hlxclib/string.h"

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

#ifndef CLittleEndianToBigEndian_INLINE

//
//	By Default the class is setup to be non big endian.
//
BOOL	CLittleEndianToBigEndian::mBigEndian=FALSE;


//
//	Make sure we run the TestBigEndian function.
//
BOOL	CLittleEndianToBigEndian::mInitialized=FALSE;

//
//	Checks to see if the machine is little endian or big endian.
//
#define bigendiantest 0x0001
BOOL	CLittleEndianToBigEndian::TestBigEndian(void)
{
    BOOL rc = FALSE;
    UINT16	test=bigendiantest;
    UCHAR*	bytes=(UCHAR*)&test;

    if (bytes[0] == 0)
    {
	rc = TRUE;
    }
	
    return rc;
}


void	CLittleEndianToBigEndian::ReverseWORD(UINT16&	w)
{
	if (mInitialized == FALSE)
	{
		mBigEndian = TestBigEndian();
	}

	if (mBigEndian)
	{
		UCHAR*	bytes;

		bytes=(UCHAR*)&w;

		//
		//	flip bytes around.
		//
		UCHAR tempbyte=bytes[0];
		bytes[0]=bytes[1];
		bytes[1]=tempbyte;
	}
}


void	CLittleEndianToBigEndian::ReverseDWORD(ULONG32&  dw)
{
	if (mInitialized==FALSE)
	{
		mBigEndian = TestBigEndian();
	}

	if (mBigEndian)
	{
		UCHAR*	bytes;
		UCHAR	newbytes[4];

		bytes=(UCHAR*)&dw;

		//
		//	reverse the bytes in the long
		//
		newbytes[0]=bytes[3];
		newbytes[1]=bytes[2];
		newbytes[2]=bytes[1];
		newbytes[3]=bytes[0];

		::memcpy(bytes,newbytes,sizeof(ULONG32)); /* Flawfinder: ignore */
	}
}

#endif // !defined CLittleEndianToBigEndian_INLINE