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