packedvalues.h

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 
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
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 * 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. 
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 * This file, and the files included with this file, is distributed and made 
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 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
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 * ***** END LICENSE BLOCK ***** */ 

#ifndef _PACKEDVALUES_H_
#define _PACKEDVALUES_H_

#define PROP_TYPE_ULONG32 0
#define PROP_TYPE_CSTRING 1
#define PROP_TYPE_BUFFER  2

struct PackedValuesHeader {
    UINT8    fourCC[4];	    //fourCC to identify the buffer
    UINT32   size;	    //size of the data

    void pack()
    {
	size = ((size&0xff)<<24) + (((size>>8)&0xff)<<16)
	      + (((size>>16)&0xff)<<8) + ((size>>24)&0xff);
    }
    void unpack()
    {
	pack();
    }
};

/*
    packed buffer format: fourCC:size:num_items:<item1>:<item2>:....
    item format: type(8):name_len(8):name:data_len(16):data
*/
class PackedValues {
public:
    static UINT32 size(IHXValues* pValues);
    static HX_RESULT pack(UINT8* buf, UINT32 &len, IHXValues* pValues, UINT8 fourCC[4]);

    HX_RESULT unpack(UINT8* buf, UINT32 len, IHXValues* pValues, IHXCommonClassFactory* pCCF = NULL);
    UINT8 m_fourCC[4];

private:
    static UINT32 packone(UINT8* buf, UINT8 type, UINT8 name_length, UINT8* name, UINT16 value_length, UINT8* value_data);
};

#endif