66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
|
/*++
|
||
|
|
|
||
|
|
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
|
||
|
|
|