fxmemorybufferpreallocated.cpp

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/*++
 
Copyright (c) Microsoft Corporation
 
Module Name:
 
    FxMemoryBufferPreallocated.cpp
 
Abstract:
 
    This module implements a frameworks managed FxMemoryBufferPreallocated
 
Author:
 
Environment:
 
    kernel mode only
 
Revision History:
 
--*/
 
#include "coreprivshared.hpp"
#include "fxmemorybufferpreallocated.hpp"
 
FxMemoryBufferPreallocated::FxMemoryBufferPreallocated(
    _In_ PFX_DRIVER_GLOBALS FxDriverGlobals,
    _Pre_notnull_ _Pre_writable_byte_size_(BufferSize) PVOID Buffer,
    _In_ size_t BufferSize
    ) :
    FxMemoryObject(FxDriverGlobals, sizeof(*this), BufferSize),
    m_pBuffer(Buffer)
/*++
 
Routine Description:
    Contstructor for this object.  Stores off all the pointers and sizes passed
    in by the caller.
 
Arguments:
    Buffer  - Buffer to associate with this object
 
    BufferSize - Size of Buffer in bytes
 
Return Value:
    None
 
  --*/
{
}
 
FxMemoryBufferPreallocated::FxMemoryBufferPreallocated(
    _In_ PFX_DRIVER_GLOBALS FxDriverGlobals,
    _In_ USHORT ObjectSize,
    _Pre_notnull_ _Pre_writable_byte_size_(BufferSize) PVOID Buffer,
    _In_ size_t BufferSize
    ) :
    FxMemoryObject(FxDriverGlobals, ObjectSize, BufferSize),
    m_pBuffer(Buffer)
/*++
 
Routine Description:
    Contstructor for this object.  Stores off all the pointers and sizes passed
    in by the caller.
 
Arguments:
    ObjectSize  - Size of the derived object
 
    Buffer  - Buffer to associate with this object
 
    BufferSize - Size of Buffer in bytes
 
Return Value:
    None
 
  --*/
{
}
 
 
FxMemoryBufferPreallocated::FxMemoryBufferPreallocated(
    __in USHORT ObjectSize,
    __in PFX_DRIVER_GLOBALS FxDriverGlobals
    ) : FxMemoryObject(FxDriverGlobals, ObjectSize, 0), m_pBuffer(NULL)
/*++
 
Routine Description:
    Contstructor for this object.  Stores off all the pointers and sizes passed
    in by the caller.
 
Arguments:
    ObjectSize  - Size of the derived object.
 
Return Value:
    None
 
  --*/
{
}
 
FxMemoryBufferPreallocated::~FxMemoryBufferPreallocated()
/*++
 
Routine Description:
    Destructor for this object.  Does nothing with the client memory since
    the client owns it.
 
Arguments:
    None
 
Return Value:
    None
 
  --*/
{
}
 
_Must_inspect_result_
NTSTATUS
FxMemoryBufferPreallocated::QueryInterface(
    __inout FxQueryInterfaceParams* Params
    )
{
    if (Params->Type == FX_TYPE_MEMORY_PREALLOCATED) {
        *Params->Object = (FxMemoryBufferPreallocated*) this;
        return STATUS_SUCCESS;
    }
    else {
        return FxMemoryObject::QueryInterface(Params); // __super call
    }
}
 
VOID
FxMemoryBufferPreallocated::UpdateBuffer(
    _Pre_notnull_ _Pre_writable_byte_size_(BufferSize) PVOID Buffer,
    _In_ size_t BufferSize
    )
/*++
 
Routine Description:
    Updates the internal pointer to a new value.
 
 
Arguments:
    Buffer - new buffer
 
    BufferSize - length of Buffer in bytes
 
Return Value:
    None.
 
  --*/
 
{
    m_pBuffer = Buffer;
    m_BufferSize = BufferSize;
}