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196 lines
3.1 KiB
196 lines
3.1 KiB
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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nullio.cpp
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Abstract:
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This module implements the NULL IoHandler.
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The purpose of this IoHandler is to provide a NULL
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channel for lockable IoHandlers. When the IoHandler
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is locked, the IoHandler client writes to a NULL device.
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Author:
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Brian Guarraci (briangu), 2001
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Revision History:
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--*/
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#include "nullio.h"
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CNullIoHandler::CNullIoHandler(
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VOID
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)
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/*++
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Routine Description:
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Constructor
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Arguments:
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None
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Return Value:
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N/A
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--*/
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{
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NOTHING;
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}
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CNullIoHandler::~CNullIoHandler(
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)
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/*++
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Routine Description:
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Destructor
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Arguments:
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N/A
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Return Value:
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N/A
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--*/
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{
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NOTHING;
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}
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BOOL
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CNullIoHandler::Write(
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IN PBYTE Buffer,
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IN ULONG BufferSize
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)
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/*++
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Routine Description:
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This routine impelements the write IoHandler operation.
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Arguments:
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Buffer - the data to send
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BufferSize - the size of the buffer in bytes
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Return Value:
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TRUE - success
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FALSE - otherwise
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--*/
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{
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UNREFERENCED_PARAMETER(Buffer);
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UNREFERENCED_PARAMETER(BufferSize);
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//
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// Do Nothing
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//
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return TRUE;
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}
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BOOL
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CNullIoHandler::Flush(
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VOID
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)
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/*++
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Routine Description:
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This routine implements the Flush IoHandler method.
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Arguments:
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None
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Return Value:
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TRUE - success
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FALSE - otherwise
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--*/
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{
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//
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// Do Nothing
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//
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return TRUE;
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}
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BOOL
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CNullIoHandler::Read(
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OUT PBYTE Buffer,
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IN ULONG BufferSize,
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OUT PULONG ByteCount
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)
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/*++
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Routine Description:
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This routine implements the Read IoHandler method.
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Arguments:
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Buffer - on success, contains the read data
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BufferSize - the size of the read buffer in bytes
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ByteCount - on success, contains the # of bytes read
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Return Value:
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TRUE - success
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FALSE - otherwise
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--*/
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{
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UNREFERENCED_PARAMETER(Buffer);
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UNREFERENCED_PARAMETER(BufferSize);
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//
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// No data was read
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//
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*ByteCount = 0;
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return TRUE;
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}
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BOOL
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CNullIoHandler::HasNewData(
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IN PBOOL InputWaiting
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)
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/*++
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Routine Description:
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This routine impelements the HasNewData IoHandler method.
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Arguments:
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InputWaiting - on success, contains the status of the channel's
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input buffer.
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Return Value:
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TRUE - success
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FALSE - otherwise
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--*/
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{
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//
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// There is no new data
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//
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*InputWaiting = FALSE;
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return TRUE;
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}
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