/*
 * Copyright 2005, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */

#ifndef _BOOT_NET_CHAIN_BUFFER_H
#define _BOOT_NET_CHAIN_BUFFER_H

#include <SupportDefs.h>

class ChainBuffer {
public:

        ChainBuffer(void *data = 0, uint32 size = 0, ChainBuffer *next = NULL,
                bool freeData = false);
        ~ChainBuffer();

        void *Data() const                      { return fData; }
        uint32 Size() const                     { return fSize; }
        uint32 TotalSize() const        { return fTotalSize; }

        ChainBuffer *Next() const       { return fNext; }
        ChainBuffer *DetachNext();

        void Append(ChainBuffer *next);

        void Flatten(void *_buffer) const;

private:
// TODO: Implement Create() and Delete(). Make new and delete operators private.
        enum {
                CHAIN_BUFFER_HEAD                       = 0x1,
                CHAIN_BUFFER_EMBEDDED_DATA      = 0x2,
                CHAIN_BUFFER_FREE_DATA          = 0x4,
                CHAIN_BUFFER_ON_STACK           = 0x8,
        };

        void _Init(void *data, uint32 size, ChainBuffer *next, uint32 flags);
        void _Destroy();

        uint32          fFlags:4;
        uint32          fSize:14;
        uint32          fTotalSize:14;
        void            *fData;
        ChainBuffer     *fNext;
        uint8           fBuffer[0];
};

#endif  // _BOOT_NET_CHAIN_BUFFER_H