packedvalues.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 "hxtypes.h"
#include "hxcom.h"
#include "hxresult.h"
#include "hxstrutl.h"
#include "hxstring.h"
#include "hxbuffer.h"

#include "hxccf.h"
#include "hxassert.h"

#include "packedvalues.h"


inline UINT32
PackedValues::size(IHXValues* pValues)
{
    if (!pValues)
    {
	return 0;
    }

    const char* pPropName;
    ULONG32 uPropValue;
    IHXBuffer* pBuffer;
    HX_RESULT retVal;
    UINT32 ulSize = sizeof(PackedValuesHeader) + 4; //header, nitems

    //ULONG32
    retVal = pValues->GetFirstPropertyULONG32(pPropName, uPropValue);
    while (retVal == HXR_OK)
    {
	ulSize += 1 + 1 + (strlen(pPropName)+1) + 2 + 4;
	retVal = pValues->GetNextPropertyULONG32(pPropName, uPropValue);
    }
    //CString
    retVal = pValues->GetFirstPropertyCString(pPropName, pBuffer);
    while (retVal == HXR_OK)
    {
	ulSize += 1 + 1 + (strlen(pPropName)+1) + 2 + pBuffer->GetSize();
	pBuffer->Release();
	retVal = pValues->GetNextPropertyCString(pPropName, pBuffer);
    }
    //Buffer
    retVal = pValues->GetFirstPropertyBuffer(pPropName, pBuffer);
    while (retVal == HXR_OK)
    {
	ulSize += 1 + 1 + (strlen(pPropName)+1) + 2 + pBuffer->GetSize();
	pBuffer->Release();
	retVal = pValues->GetNextPropertyBuffer(pPropName, pBuffer);
    }

    return ulSize;
}

UINT32 PackedValues::packone(UINT8* buf, UINT8 type, UINT8 name_length, UINT8* name, UINT16 value_length, UINT8* value_data)
{
    UINT8* off = buf;
    *off++ = type;
    *off++ = name_length;
    {memcpy(off, name, name_length); off += name_length; }
    {*off++ = (UINT8) (value_length>>8); *off++ = (UINT8) (value_length);}
    {memcpy(off, value_data, value_length); off += value_length; }
    return off-buf;
}

HX_RESULT PackedValues::pack(UINT8* buf, UINT32 &len, IHXValues* pValues, UINT8 fourCC[4])
{
    HX_ASSERT(len >= size(pValues));

    if (!pValues)
    {
	len = 0;
	return HXR_FAIL;
    }

    PackedValuesHeader* pHeader = (PackedValuesHeader*)buf;
    memcpy(pHeader->fourCC, fourCC, 4);
    buf += sizeof(PackedValuesHeader);

    UINT8* off = buf + 4; //header, nitems

    const char* pPropName;
    ULONG32 uPropValue;
    IHXBuffer* pBuffer;
    HX_RESULT retVal;
    UINT32 uTotal = 0;

    //pack ULONG32
    retVal = pValues->GetFirstPropertyULONG32(pPropName, uPropValue);
    while (retVal == HXR_OK)
    {
	uTotal++;
	UINT8 pULONGBuffer[4];
	pULONGBuffer[0] = (UINT8)(uPropValue >> 24);pULONGBuffer[1] = (UINT8)(uPropValue >> 16);
	pULONGBuffer[2] = (UINT8)(uPropValue >> 8); pULONGBuffer[3] = (UINT8)(uPropValue);

	off += packone(off, PROP_TYPE_ULONG32, strlen(pPropName)+1, (UINT8*)pPropName, 4, pULONGBuffer);
	retVal = pValues->GetNextPropertyULONG32(pPropName, uPropValue);
    }
    //pack CString
    retVal = pValues->GetFirstPropertyCString(pPropName, pBuffer);
    while (retVal == HXR_OK)
    {
	uTotal++;
	off += packone(off, PROP_TYPE_CSTRING, strlen(pPropName)+1, (UINT8*)pPropName, (UINT16)(pBuffer->GetSize()), pBuffer->GetBuffer());
	pBuffer->Release();
	retVal = pValues->GetNextPropertyCString(pPropName, pBuffer);
    }
    //pack Buffer
    retVal = pValues->GetFirstPropertyBuffer(pPropName, pBuffer);
    while (retVal == HXR_OK)
    {
	uTotal++;
	off += packone(off, PROP_TYPE_BUFFER, strlen(pPropName)+1, (UINT8*)pPropName, (UINT16)(pBuffer->GetSize()), pBuffer->GetBuffer());
	pBuffer->Release();
	retVal = pValues->GetNextPropertyBuffer(pPropName, pBuffer);
    }

    //the total number of items
    buf[0] = (UINT8)(uTotal >> 24); buf[1] = (UINT8)(uTotal >> 16);
    buf[2] = (UINT8)(uTotal >> 8 ); buf[3] = (UINT8)(uTotal);

    //header
    UINT32 datasize = off - buf;
    pHeader->size = datasize;
    pHeader->pack();

    len = off - buf + sizeof(PackedValuesHeader);

    return HXR_OK;
}

HX_RESULT PackedValues::unpack(UINT8* buf, UINT32 len, IHXValues* pValues, IHXCommonClassFactory* pCCF)
{
    HX_ASSERT(buf && len > 0); HX_ASSERT(pValues);

    PackedValuesHeader* pHeader = (PackedValuesHeader*)buf;
    memcpy(m_fourCC, pHeader->fourCC, 4);
    
    buf += sizeof(PackedValuesHeader);

    UINT8  type;
    UINT8  name_length;
    UINT8* name;
    UINT16 value_length;
    UINT8* value_data;
    UINT8* off = buf + 4; //nitems


    UINT32 uTotal = (buf[0]<<24) + (buf[1]<<16) + (buf[2]<<8) + buf[3];

    HX_RESULT retVal = HXR_OK;
    for (UINT32 i=0; i < uTotal && retVal == HXR_OK; i++)
    {
	type = *off++;
	name_length = *off++;
	name = off; off += name_length;
	value_length = (off[0] << 8) + off[1]; off+=2;
	value_data = off; off += value_length;

	IHXBuffer* pBuffer = NULL;

	switch(type)
	{
	    case PROP_TYPE_ULONG32:
		pValues->SetPropertyULONG32((char*)name, (value_data[0]<<24) + (value_data[1]<<16) 
						 + (value_data[2]<<8) + value_data[3]);
		break;
	    case PROP_TYPE_CSTRING:
		if (pCCF)
		{
		    retVal = pCCF->CreateInstance(CLSID_IHXBuffer, (void**)&pBuffer);
		    if (retVal == HXR_OK)
		    {
			pBuffer->Set(value_data, value_length);
			pValues->SetPropertyCString((char*)name, pBuffer);
			pBuffer->Release();
		    }
		}
		break;
	    case PROP_TYPE_BUFFER:
		if (pCCF)
		{
		    retVal = pCCF->CreateInstance(CLSID_IHXBuffer, (void**)&pBuffer);
		    if (retVal == HXR_OK)
		    {
			pBuffer->Set(value_data, value_length);
			pValues->SetPropertyCString((char*)name, pBuffer);
			pBuffer->Release();
		    }
		}
		break;
	}
    }
    
    return retVal;
}