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- Check more exactly for a FAT file system.
svn path=/trunk/; revision=9284
This commit is contained in:
Hartmut Birr
parent
a4b7d6a7a5
commit
38ed29a671
2 changed files with 151 additions and 47 deletions
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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*/
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/* $Id: fat.c,v 1.8 2003/11/17 02:12:49 hyperion Exp $
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/* $Id: fat.c,v 1.9 2004/05/02 20:12:38 hbirr Exp $
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*
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*
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* COPYRIGHT: See COPYING in the top level directory
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PROJECT: ReactOS kernel
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@ -41,57 +41,143 @@
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static NTSTATUS
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static NTSTATUS
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FsRecIsFatVolume(IN PDEVICE_OBJECT DeviceObject)
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FsRecIsFatVolume(IN PDEVICE_OBJECT DeviceObject)
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{
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{
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DISK_GEOMETRY DiskGeometry;
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NTSTATUS Status;
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PUCHAR Buffer;
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PARTITION_INFORMATION PartitionInfo;
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ULONG Size;
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DISK_GEOMETRY DiskGeometry;
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NTSTATUS Status;
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ULONG Size;
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struct _BootSector* Boot;
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BOOL RecognizedFS = FALSE;
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Size = sizeof(DISK_GEOMETRY);
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Size = sizeof(DISK_GEOMETRY);
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Status = FsRecDeviceIoControl(DeviceObject,
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Status = FsRecDeviceIoControl(DeviceObject,
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IOCTL_DISK_GET_DRIVE_GEOMETRY,
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IOCTL_DISK_GET_DRIVE_GEOMETRY,
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NULL,
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NULL,
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0,
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0,
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&DiskGeometry,
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&DiskGeometry,
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&Size);
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&Size);
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if (!NT_SUCCESS(Status))
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DPRINT("FsRecDeviceIoControl() Status %lx\n", Status);
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{
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if (!NT_SUCCESS(Status))
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DPRINT("FsRecDeviceIoControl faild (%x)\n", Status);
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{
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return Status;
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return(Status);
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}
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}
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if (DiskGeometry.MediaType == FixedMedia || DiskGeometry.MediaType == RemovableMedia)
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{
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// We have found a hard disk
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Size = sizeof(PARTITION_INFORMATION);
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Status = FsRecDeviceIoControl(DeviceObject,
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IOCTL_DISK_GET_PARTITION_INFO,
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NULL,
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0,
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&PartitionInfo,
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&Size);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("FsRecDeviceIoControl faild (%x)\n", Status);
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return Status;
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}
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DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
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if (PartitionInfo.PartitionType)
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Buffer = ExAllocatePool(NonPagedPool,
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{
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DiskGeometry.BytesPerSector);
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if (PartitionInfo.PartitionType == PARTITION_FAT_12 ||
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if (Buffer == NULL)
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PartitionInfo.PartitionType == PARTITION_FAT_16 ||
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{
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PartitionInfo.PartitionType == PARTITION_HUGE ||
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return(STATUS_INSUFFICIENT_RESOURCES);
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PartitionInfo.PartitionType == PARTITION_FAT32 ||
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}
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PartitionInfo.PartitionType == PARTITION_FAT32_XINT13 ||
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PartitionInfo.PartitionType == PARTITION_XINT13)
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{
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RecognizedFS = TRUE;
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}
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}
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else if (DiskGeometry.MediaType == RemovableMedia &&
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PartitionInfo.PartitionNumber > 0 &&
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PartitionInfo.StartingOffset.QuadPart == 0LL &&
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PartitionInfo.PartitionLength.QuadPart > 0LL)
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{
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/* This is possible a removable media formated as super floppy */
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RecognizedFS = TRUE;
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}
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}
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if (DiskGeometry.MediaType > Unknown && DiskGeometry.MediaType < RemovableMedia )
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{
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RecognizedFS = TRUE;
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}
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if (RecognizedFS == FALSE)
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{
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return STATUS_UNRECOGNIZED_VOLUME;
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}
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Status = FsRecReadSectors(DeviceObject,
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Boot = ExAllocatePool(NonPagedPool, DiskGeometry.BytesPerSector);
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0, /* Partition boot sector */
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if (Boot == NULL)
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1,
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{
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DiskGeometry.BytesPerSector,
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return STATUS_INSUFFICIENT_RESOURCES;
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Buffer);
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}
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if (!NT_SUCCESS(Status))
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{
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ExFreePool(Buffer);
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return(Status);
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}
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if ((strncmp(&Buffer[0x36], "FAT12", 5) == 0) ||
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Status = FsRecReadSectors(DeviceObject,
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(strncmp(&Buffer[0x36], "FAT16", 5) == 0) ||
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0,
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(strncmp(&Buffer[0x52], "FAT32", 5) == 0))
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1,
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{
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DiskGeometry.BytesPerSector,
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Status = STATUS_SUCCESS;
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(PUCHAR) Boot);
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}
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if (!NT_SUCCESS(Status))
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else
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{
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{
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return Status;
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Status = STATUS_UNRECOGNIZED_VOLUME;
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}
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}
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ExFreePool(Buffer);
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if (Boot->Signatur1 != 0xaa55)
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{
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RecognizedFS=FALSE;
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}
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if (RecognizedFS &&
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Boot->BytesPerSector != 512 &&
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Boot->BytesPerSector != 1024 &&
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Boot->BytesPerSector != 2048 &&
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Boot->BytesPerSector == 4096)
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{
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RecognizedFS=FALSE;
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}
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return(Status);
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if (RecognizedFS &&
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Boot->FATCount != 1 &&
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Boot->FATCount != 2)
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{
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RecognizedFS=FALSE;
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}
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if (RecognizedFS &&
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Boot->Media != 0xf0 &&
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Boot->Media != 0xf8 &&
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Boot->Media != 0xf9 &&
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Boot->Media != 0xfa &&
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Boot->Media != 0xfb &&
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Boot->Media != 0xfc &&
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Boot->Media != 0xfd &&
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Boot->Media != 0xfe &&
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Boot->Media != 0xff)
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{
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RecognizedFS=FALSE;
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}
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if (RecognizedFS &&
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Boot->SectorsPerCluster != 1 &&
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Boot->SectorsPerCluster != 2 &&
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Boot->SectorsPerCluster != 4 &&
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Boot->SectorsPerCluster != 8 &&
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Boot->SectorsPerCluster != 16 &&
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Boot->SectorsPerCluster != 32 &&
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Boot->SectorsPerCluster != 64 &&
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Boot->SectorsPerCluster != 128)
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{
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RecognizedFS=FALSE;
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}
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if (RecognizedFS &&
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Boot->BytesPerSector * Boot->SectorsPerCluster > 32 * 1024)
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{
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RecognizedFS=FALSE;
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}
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ExFreePool(Boot);
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return RecognizedFS ? STATUS_SUCCESS : STATUS_UNRECOGNIZED_VOLUME;
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}
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}
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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*/
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/* $Id: fs_rec.h,v 1.3 2003/01/16 11:58:15 ekohl Exp $
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/* $Id: fs_rec.h,v 1.4 2004/05/02 20:12:38 hbirr Exp $
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*
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*
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* COPYRIGHT: See COPYING in the top level directory
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PROJECT: ReactOS kernel
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@ -40,6 +40,24 @@ typedef struct _DEVICE_EXTENSION
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ULONG FsType;
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ULONG FsType;
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} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
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} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
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struct _BootSector
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{
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unsigned char magic0, res0, magic1;
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unsigned char OEMName[8];
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unsigned short BytesPerSector;
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unsigned char SectorsPerCluster;
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unsigned short ReservedSectors;
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unsigned char FATCount;
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unsigned short RootEntries, Sectors;
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unsigned char Media;
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unsigned short FATSectors, SectorsPerTrack, Heads;
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unsigned long HiddenSectors, SectorsHuge;
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unsigned char Drive, Res1, Sig;
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unsigned long VolumeID;
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unsigned char VolumeLabel[11], SysType[8];
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unsigned char Res2[448];
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unsigned short Signatur1;
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} __attribute__((packed));
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/* blockdev.c */
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/* blockdev.c */
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