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110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/*
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* PROJECT: Filesystem Filter Manager
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: drivers/filters/fltmgr/Context.c
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* PURPOSE: Contains routines for the volume
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* PROGRAMMERS: Ged Murphy (gedmurphy@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include "fltmgr.h"
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#include "fltmgrint.h"
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#define NDEBUG
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#include <debug.h>
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/* DATA *********************************************************************/
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/* EXPORTED FUNCTIONS ******************************************************/
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NTSTATUS
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FLTAPI
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FltGetVolumeProperties(
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_In_ PFLT_VOLUME Volume,
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_Out_writes_bytes_to_opt_(VolumePropertiesLength, *LengthReturned) PFLT_VOLUME_PROPERTIES VolumeProperties,
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_In_ ULONG VolumePropertiesLength,
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_Out_ PULONG LengthReturned
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)
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{
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ULONG BufferRequired;
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ULONG BytesWritten;
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PCHAR Ptr;
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NTSTATUS Status;
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/* Calculate the required buffer size */
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BufferRequired = sizeof(FLT_VOLUME_PROPERTIES) +
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Volume->CDODriverName.Length +
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Volume->DeviceName.Length +
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Volume->CDODeviceName.Length;
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/* If we don't have enough buffer to fill in the fixed struct, return with the required size */
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if (VolumePropertiesLength < sizeof(FLT_VOLUME_PROPERTIES))
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{
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*LengthReturned = BufferRequired;
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return STATUS_BUFFER_TOO_SMALL;
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}
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/* Clear out the buffer */
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RtlZeroMemory(VolumeProperties, sizeof(FLT_VOLUME_PROPERTIES));
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/* Fill in the fixed data */
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VolumeProperties->DeviceType = Volume->DeviceObject->DeviceType;
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VolumeProperties->DeviceObjectFlags = Volume->DeviceObject->Flags;
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VolumeProperties->AlignmentRequirement = Volume->DeviceObject->AlignmentRequirement;
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VolumeProperties->SectorSize = Volume->DeviceObject->SectorSize;
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if (Volume->DiskDeviceObject)
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{
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VolumeProperties->DeviceCharacteristics = Volume->DiskDeviceObject->Characteristics;
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}
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else
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{
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VolumeProperties->DeviceCharacteristics = Volume->DeviceObject->Characteristics;
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}
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/* So far we've written the fixed struct data */
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BytesWritten = sizeof(FLT_VOLUME_PROPERTIES);
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Ptr = (PCHAR)(VolumeProperties + 1);
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/* Make sure we have enough room to add the dynamic data */
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if (VolumePropertiesLength >= BufferRequired)
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{
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/* Add the FS device name */
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VolumeProperties->FileSystemDeviceName.Length = 0;
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VolumeProperties->FileSystemDeviceName.MaximumLength = Volume->CDODeviceName.Length;
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VolumeProperties->FileSystemDeviceName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->FileSystemDeviceName, &Volume->CDODeviceName);
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Ptr += VolumeProperties->FileSystemDeviceName.Length;
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/* Add the driver name */
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VolumeProperties->FileSystemDriverName.Length = 0;
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VolumeProperties->FileSystemDriverName.MaximumLength = Volume->CDODriverName.Length;
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VolumeProperties->FileSystemDriverName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->FileSystemDriverName, &Volume->CDODriverName);
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Ptr += VolumeProperties->FileSystemDriverName.Length;
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/* Add the volume name */
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VolumeProperties->RealDeviceName.Length = 0;
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VolumeProperties->RealDeviceName.MaximumLength = Volume->DeviceName.Length;
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VolumeProperties->RealDeviceName.Buffer = (PWCH)Ptr;
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RtlCopyUnicodeString(&VolumeProperties->RealDeviceName, &Volume->DeviceName);
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BytesWritten = BufferRequired;
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Status = STATUS_SUCCESS;
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}
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else
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{
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Status = STATUS_BUFFER_OVERFLOW;
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}
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/* Set the number of bytes we wrote and return */
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*LengthReturned = BytesWritten;
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return Status;
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}
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/* INTERNAL FUNCTIONS ******************************************************/ |