161 lines
3.2 KiB
C
161 lines
3.2 KiB
C
|
/*++
|
|||
|
|
|
|||
|
|
Copyright (c) 1998, Microsoft Corporation
|
|||
|
|
|
|||
|
|
Module Name:
|
|||
|
|
|
|||
|
|
buffer.h
|
|||
|
|
|
|||
|
|
Abstract:
|
|||
|
|
|
|||
|
|
This module contains declarations for buffer-management.
|
|||
|
|
|
|||
|
|
All network I/O in this component occurs via completion packets.
|
|||
|
|
The buffer routines below are used to acquire and release the buffers
|
|||
|
|
used for sending and receiving data.
|
|||
|
|
|
|||
|
|
In addition to holding the data transferred, the buffers contain fields
|
|||
|
|
to facilitate their use with completion ports. See below for details
|
|||
|
|
on the use of the fields.
|
|||
|
|
|
|||
|
|
Author:
|
|||
|
|
|
|||
|
|
Abolade Gbadegesin (aboladeg) 2-Mar-1998
|
|||
|
|
|
|||
|
|
Revision History:
|
|||
|
|
|
|||
|
|
--*/
|
|||
|
|
|
|||
|
|
#ifndef _NATHLP_BUFFER_H_
|
|||
|
|
#define _NATHLP_BUFFER_H_
|
|||
|
|
|
|||
|
|
#define NH_BUFFER_SIZE 576
|
|||
|
|
#define NH_MAX_BUFFER_QUEUE_LENGTH 32
|
|||
|
|
|
|||
|
|
struct _NH_BUFFER;
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Typedef: PNH_COMPLETION_ROUTINE
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
typedef
|
|||
|
|
VOID
|
|||
|
|
(*PNH_COMPLETION_ROUTINE)(
|
|||
|
|
ULONG ErrorCode,
|
|||
|
|
ULONG BytesTransferred,
|
|||
|
|
struct _NH_BUFFER* Bufferp
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Structure: NH_BUFFER
|
|||
|
|
//
|
|||
|
|
// This structure holds a buffer used for network I/O on a socket.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
typedef enum _NH_BUFFER_TYPE {
|
|||
|
|
NhFixedLengthBufferType,
|
|||
|
|
NhVariableLengthBufferType
|
|||
|
|
} NH_BUFFER_TYPE;
|
|||
|
|
|
|||
|
|
class _CNhSock;
|
|||
|
|
|
|||
|
|
typedef struct _NH_BUFFER {
|
|||
|
|
union {
|
|||
|
|
LIST_ENTRY Link;
|
|||
|
|
NH_BUFFER_TYPE Type;
|
|||
|
|
};
|
|||
|
|
//
|
|||
|
|
// The socket associated with the buffer's most recent I/O request
|
|||
|
|
//
|
|||
|
|
class _CNhSock * Socketp;
|
|||
|
|
//
|
|||
|
|
// Completion routine and contexts for the buffer's most recent I/O request
|
|||
|
|
//
|
|||
|
|
PNH_COMPLETION_ROUTINE CompletionRoutine;
|
|||
|
|
PVOID Context;
|
|||
|
|
PVOID Context2;
|
|||
|
|
//
|
|||
|
|
// Passed as the system context area for any I/O using the buffer
|
|||
|
|
//
|
|||
|
|
OVERLAPPED Overlapped;
|
|||
|
|
//
|
|||
|
|
// Upon completion of a receive, the receive-flags and source-address
|
|||
|
|
// length for the message read
|
|||
|
|
//
|
|||
|
|
ULONG ReceiveFlags;
|
|||
|
|
ULONG AddressLength;
|
|||
|
|
union {
|
|||
|
|
//
|
|||
|
|
// Holds the source address when a datagram-read completes
|
|||
|
|
//
|
|||
|
|
SOCKADDR_IN ReadAddress;
|
|||
|
|
//
|
|||
|
|
// Holds the destination address while a datagram-send is in progress
|
|||
|
|
//
|
|||
|
|
SOCKADDR_IN WriteAddress;
|
|||
|
|
//
|
|||
|
|
// Holds the remote address while a connect is in progress
|
|||
|
|
//
|
|||
|
|
SOCKADDR_IN ConnectAddress;
|
|||
|
|
//
|
|||
|
|
// Holds the state of a multi-request read or write
|
|||
|
|
//
|
|||
|
|
struct {
|
|||
|
|
ULONG UserFlags;
|
|||
|
|
ULONG BytesToTransfer;
|
|||
|
|
ULONG TransferOffset;
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
//
|
|||
|
|
// Upon completion of an I/O request, the error-code, byte-count,
|
|||
|
|
// and data-bytes for the request
|
|||
|
|
//
|
|||
|
|
ULONG ErrorCode;
|
|||
|
|
ULONG BytesTransferred;
|
|||
|
|
UCHAR Buffer[NH_BUFFER_SIZE];
|
|||
|
|
} NH_BUFFER, *PNH_BUFFER;
|
|||
|
|
|
|||
|
|
#define NH_ALLOCATE_BUFFER() \
|
|||
|
|
reinterpret_cast<PNH_BUFFER>(NH_ALLOCATE(sizeof(NH_BUFFER)))
|
|||
|
|
|
|||
|
|
#define NH_FREE_BUFFER(b) NH_FREE(b)
|
|||
|
|
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// BUFFER-MANAGEMENT ROUTINES (alphabetically)
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
#define NhAcquireBuffer() NhAcquireFixedLengthBuffer()
|
|||
|
|
PNH_BUFFER
|
|||
|
|
NhAcquireFixedLengthBuffer(
|
|||
|
|
VOID
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
PNH_BUFFER
|
|||
|
|
NhAcquireVariableLengthBuffer(
|
|||
|
|
ULONG Length
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
PNH_BUFFER
|
|||
|
|
NhDuplicateBuffer(
|
|||
|
|
PNH_BUFFER Bufferp
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
ULONG
|
|||
|
|
NhInitializeBufferManagement(
|
|||
|
|
VOID
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
NhReleaseBuffer(
|
|||
|
|
PNH_BUFFER Bufferp
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
VOID
|
|||
|
|
NhShutdownBufferManagement(
|
|||
|
|
VOID
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
#endif // _NATHLP_BUFFER_H_
|