reactos/drivers/fs/fs_rec/cdfs.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2002 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: cdfs.c,v 1.2 2002/05/15 18:02:59 ekohl Exp $
  20  *
  21  * COPYRIGHT:        See COPYING in the top level directory
  22  * PROJECT:          ReactOS kernel
  23  * FILE:             services/fs/fs_rec/cdfs.c
  24  * PURPOSE:          Filesystem recognizer driver
  25  * PROGRAMMER:       Eric Kohl
  26  */
  27
  28 /* INCLUDES *****************************************************************/
  29
  30 #include <ddk/ntddk.h>
  31
  32 #define NDEBUG
  33 #include <debug.h>
  34
  35 #include "fs_rec.h"
  36
  37
  38 /* FUNCTIONS ****************************************************************/
  39
  40 static NTSTATUS
  41 FsRecIsCdfsVolume(IN PDEVICE_OBJECT DeviceObject)
  42 {
  43   DISK_GEOMETRY DiskGeometry;
  44   PUCHAR Buffer;
  45   NTSTATUS Status;
  46   ULONG Size;
  47
  48   Size = sizeof(DISK_GEOMETRY);
  49   Status = FsRecDeviceIoControl(DeviceObject,
  50                                 IOCTL_CDROM_GET_DRIVE_GEOMETRY,
  51                                 NULL,
  52                                 0,
  53                                 &DiskGeometry,
  54                                 &Size);
  55   DPRINT("FsRecDeviceIoControl() Status %lx\n", Status);
  56   if (!NT_SUCCESS(Status))
  57     {
  58       return(Status);
  59     }
  60
  61   DPRINT("BytesPerSector: %lu\n", DiskGeometry.BytesPerSector);
  62   Buffer = ExAllocatePool(NonPagedPool,
  63                           DiskGeometry.BytesPerSector);
  64   if (Buffer == NULL)
  65     {
  66       return(STATUS_INSUFFICIENT_RESOURCES);
  67     }
  68
  69   Status = FsRecReadSectors(DeviceObject,
  70                             16, /* CDFS_PVD_SECTOR */
  71                             1,
  72                             DiskGeometry.BytesPerSector,
  73                             Buffer);
  74   if (!NT_SUCCESS(Status))
  75     {
  76       return(Status);
  77     }
  78
  79   Buffer[6] = 0;
  80   DPRINT("CD-identifier: [%.5s]\n", Buffer + 1);
  81
  82   Status = (Buffer[0] == 1 &&
  83             Buffer[1] == 'C' &&
  84             Buffer[2] == 'D' &&
  85             Buffer[3] == '0' &&
  86             Buffer[4] == '0' &&
  87             Buffer[5] == '1') ? STATUS_SUCCESS : STATUS_UNRECOGNIZED_VOLUME;
  88
  89   ExFreePool(Buffer);
  90
  91   return(Status);
  92 }
  93
  94
  95 NTSTATUS
  96 FsRecCdfsFsControl(IN PDEVICE_OBJECT DeviceObject,
  97                    IN PIRP Irp)
  98 {
  99   PIO_STACK_LOCATION Stack;
 100   UNICODE_STRING RegistryPath;
 101   NTSTATUS Status;
 102
 103   Stack = IoGetCurrentIrpStackLocation(Irp);
 104
 105   switch (Stack->MinorFunction)
 106     {
 107       case IRP_MN_MOUNT_VOLUME:
 108         DPRINT("Cdfs: IRP_MN_MOUNT_VOLUME\n");
 109         Status = FsRecIsCdfsVolume(Stack->Parameters.MountVolume.DeviceObject);
 110         if (NT_SUCCESS(Status))
 111           {
 112             DPRINT("Identified CDFS volume\n");
 113             Status = STATUS_FS_DRIVER_REQUIRED;
 114           }
 115         break;
 116
 117       case IRP_MN_LOAD_FILE_SYSTEM:
 118         DPRINT("Cdfs: IRP_MN_LOAD_FILE_SYSTEM\n");
 119 #if 0
 120         RtlInitUnicodeString(&RegistryPath,
 121                              L"\\Registry\\Machine\\SYSTEM\\CurrentControlSet\\Services\\Cdfs");
 122 #endif
 123         RtlInitUnicodeString(&RegistryPath,
 124                              L"\\SystemRoot\\system32\\drivers\\cdfs.sys");
 125         Status = ZwLoadDriver(&RegistryPath);
 126         if (!NT_SUCCESS(Status))
 127           {
 128             DPRINT("ZwLoadDriver failed (Status %x)\n", Status);
 129           }
 130         else
 131           {
 132             IoUnregisterFileSystem(DeviceObject);
 133           }
 134         break;
 135
 136       default:
 137         DPRINT("Cdfs: Unknown minor function %lx\n", Stack->MinorFunction);
 138         Status = STATUS_INVALID_DEVICE_REQUEST;
 139         break;
 140     }
 141   return(Status);
 142 }
 143
 144 /* EOF */