packedvalues.h

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/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: packedvalues.h,v 1.2.32.3 2004/07/09 01:48:00 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * The contents of this file, and the files included with this file,
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 * 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
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 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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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