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 1.1 2002/05/15 09:40:47 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   PUCHAR Buffer;
  44   NTSTATUS Status;
  45
  46   Buffer = ExAllocatePool(NonPagedPool,
  47                           2048);
  48   if (Buffer == NULL)
  49     {
  50       return(STATUS_INSUFFICIENT_RESOURCES);
  51     }
  52
  53   Status = FsRecReadSectors(DeviceObject,
  54                             16, /* CDFS_PVD_SECTOR */
  55                             1,
  56                             2048,
  57                             Buffer);
  58   if (!NT_SUCCESS(Status))
  59     {
  60       return(Status);
  61     }
  62
  63   Buffer[6] = 0;
  64   DPRINT("CD-identifier: [%.5s]\n", Buffer + 1);
  65
  66   Status = (Buffer[0] == 1 &&
  67             Buffer[1] == 'C' &&
  68             Buffer[2] == 'D' &&
  69             Buffer[3] == '0' &&
  70             Buffer[4] == '0' &&
  71             Buffer[5] == '1') ? STATUS_SUCCESS : STATUS_UNRECOGNIZED_VOLUME;
  72
  73   ExFreePool(Buffer);
  74
  75   return(Status);
  76 }
  77
  78
  79 NTSTATUS
  80 FsRecCdfsFsControl(IN PDEVICE_OBJECT DeviceObject,
  81                    IN PIRP Irp)
  82 {
  83   PIO_STACK_LOCATION Stack;
  84   UNICODE_STRING RegistryPath;
  85   NTSTATUS Status;
  86
  87   Stack = IoGetCurrentIrpStackLocation(Irp);
  88
  89   switch (Stack->MinorFunction)
  90     {
  91       case IRP_MN_MOUNT_VOLUME:
  92         DPRINT("Cdfs: IRP_MN_MOUNT_VOLUME\n");
  93
  94         Status = FsRecIsCdfsVolume(Stack->Parameters.MountVolume.DeviceObject);
  95         if (NT_SUCCESS(Status))
  96           {
  97             DPRINT("Identified CDFS volume\n");
  98             Status = STATUS_FS_DRIVER_REQUIRED;
  99           }
 100         break;
 101
 102       case IRP_MN_LOAD_FILE_SYSTEM:
 103         DPRINT("Cdfs: IRP_MN_LOAD_FILE_SYSTEM\n");
 104 #if 0
 105         RtlInitUnicodeString(&RegistryPath, FSD_REGISTRY_PATH);
 106 #endif
 107         RtlInitUnicodeString(&RegistryPath,
 108                              L"\\SystemRoot\\system32\\drivers\\cdfs.sys");
 109         Status = ZwLoadDriver(&RegistryPath);
 110         if (!NT_SUCCESS(Status))
 111           {
 112             DPRINT("ZwLoadDriver failed (Status %x)\n", Status);
 113           }
 114         else
 115           {
 116             IoUnregisterFileSystem(DeviceObject);
 117           }
 118         break;
 119
 120       default:
 121         DPRINT("Cdfs: Unknown minor function %lx\n", Stack->MinorFunction);
 122         Status = STATUS_INVALID_DEVICE_REQUEST;
 123         break;
 124     }
 125   return(Status);
 126 }
 127
 128 /* EOF */