Source code of Windows XP (NT5)
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/*++
Copyright (c) 1997 Microsoft Corporation
Module Name:
BUFFER.H
Abstract:
HEADER for buffers.
Author:
Aaron Ogus (aarono)
Environment:
Win32/COM
Revision History:
Date Author Description ======= ====== ============================================================ 1/30/97 aarono Original 2/17/98 aarono changed memdesc to be len,ptr from ptr,len to align with sendex data.
--*/
#ifndef _BUFFER_H_
#define _BUFFER_H_
//
// Buffer is a descriptor for a chunk of data.
//
#include "bilink.h"
typedef struct _BUFFER { union { struct _BUFFER *pNext; // Next buffer in chain
BILINK BuffList; }; PUCHAR pData; // Data area of buffer
UINT len; // length of data area
DWORD dwFlags; // info about the data area
PUCHAR pCmdData; // pointer past header to command data - used in receive path.
DWORD sequence; // absolute sequence number
} BUFFER, *PBUFFER;
#define BFLAG_PROTOCOL 0x00000001 /* This buffer is for protocol information */
#define BFLAG_DOUBLE 0x00000002 /* This buffer is a double buffer buffer */
#define BFLAG_PROTHEADER 0x00000004 /* Room for the protocol header is at the head of the packet */
#define BFLAG_FRAME 0x00000008 /* From Frame allocator */
// PROTHEADER flag will only occur with packets that have the DOUBLE flag set
// and only when the provider does not support multi-buffer sends and the
// entire message and protocol header will fit in one media frame. - actually pretty often.
typedef struct _MEMDESC { UINT len; PUCHAR pData;} MEMDESC, *PMEMDESC;
#endif
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