reactos/subsys/win32k/misc/driver.c

   1 /* $Id: driver.c,v 1.6 1999/12/09 02:45:05 rex Exp $
   2  *
   3  * GDI Driver support routines
   4  * (mostly swiped from Wine)
   5  *
   6  */
   7
   8 #undef WIN32_LEAN_AND_MEAN
   9 #include <ddk/ntddk.h>
  10 #include <windows.h>
  11 #include <win32k/driver.h>
  12 #include <wchar.h>
  13
  14 //#define NDEBUG
  15 #include <internal/debug.h>
  16
  17 typedef struct _GRAPHICS_DRIVER
  18 {
  19   PWSTR  Name;
  20   PGD_ENABLEDRIVER  EnableDriver;
  21   int  ReferenceCount;
  22   struct _GRAPHICS_DRIVER  *Next;
  23 } GRAPHICS_DRIVER, *PGRAPHICS_DRIVER;
  24
  25 static PGRAPHICS_DRIVER  DriverList;
  26 static PGRAPHICS_DRIVER  GenericDriver;
  27
  28 BOOL  DRIVER_RegisterDriver(LPCWSTR  Name, PGD_ENABLEDRIVER  EnableDriver)
  29 {
  30   PGRAPHICS_DRIVER  Driver = ExAllocatePool(NonPagedPool, sizeof(*Driver));
  31   if (!Driver)
  32     {
  33       return  FALSE;
  34     }
  35   Driver->ReferenceCount = 0;
  36   Driver->EnableDriver = EnableDriver;
  37   if (Name)
  38     {
  39       Driver->Name = ExAllocatePool(NonPagedPool,
  40                                     (wcslen(Name) + 1) * sizeof(WCHAR));
  41       wcscpy(Driver->Name, Name);
  42       Driver->Next  = DriverList;
  43       DriverList = Driver;
  44       return  TRUE;
  45     }
  46
  47   if (GenericDriver != NULL)
  48     {
  49       ExFreePool(Driver);
  50
  51       return  FALSE;
  52     }
  53
  54   Driver->Name = NULL;
  55   GenericDriver = Driver;
  56   return  TRUE;
  57 }
  58
  59 PGD_ENABLEDRIVER  DRIVER_FindDDIDriver(LPCWSTR  Name)
  60 {
  61   GRAPHICS_DRIVER *Driver = DriverList;
  62
  63   while (Driver && Name)
  64     {
  65       if (!_wcsicmp( Driver->Name, Name))
  66         {
  67           return Driver->EnableDriver;
  68         }
  69       Driver = Driver->Next;
  70     }
  71
  72   return  GenericDriver ? GenericDriver->EnableDriver : NULL;
  73 }
  74
  75 BOOL  DRIVER_BuildDDIFunctions(PDRVENABLEDATA  DED,
  76                                PDRIVER_FUNCTIONS  DF)
  77 {
  78   UNIMPLEMENTED;
  79 }
  80
  81 HANDLE  DRIVER_FindMPDriver(LPCWSTR  Name)
  82 {
  83   PWSTR  lName;
  84   HANDLE  DriverHandle;
  85   NTSTATUS  Status;
  86   UNICODE_STRING  DeviceName;
  87   OBJECT_ATTRIBUTES  ObjectAttributes;
  88
  89   if (Name[0] != '\\')
  90     {
  91       lName = ExAllocatePool(NonPagedPool, wcslen(Name) * sizeof(WCHAR) +
  92                              10 * sizeof(WCHAR));
  93       wcscpy(lName, L"\\Devices\\");
  94       wcscat(lName, Name);
  95     }
  96   else
  97     {
  98       lName = ExAllocatePool(NonPagedPool, wcslen(Name) * sizeof(WCHAR));
  99       wcscpy(lName, Name);
 100     }
 101
 102   RtlInitUnicodeString(&DeviceName, lName);
 103   InitializeObjectAttributes(&ObjectAttributes,
 104                              &DeviceName,
 105                              0,
 106                              NULL,
 107                              NULL);
 108   Status = ZwOpenFile(&DriverHandle,
 109                       FILE_ALL_ACCESS,
 110                       &ObjectAttributes,
 111                       NULL,
 112                       0,
 113                       FILE_SYNCHRONOUS_IO_ALERT);
 114   if (!NT_SUCCESS(Status))
 115     {
 116       DbgPrint("Failed to open display device\n");
 117       DbgPrint("%08lx\n", Status);
 118       if (Name[0] != '\\')
 119         {
 120           ExFreePool(lName);
 121         }
 122
 123       return  NULL;
 124     }
 125
 126   if (Name[0] != '\\')
 127     {
 128       ExFreePool(lName);
 129     }
 130
 131   return  DriverHandle;
 132 }
 133
 134 BOOL  DRIVER_UnregisterDriver(LPCWSTR  Name)
 135 {
 136   PGRAPHICS_DRIVER  Driver = NULL;
 137
 138   if (Name)
 139     {
 140       if (DriverList != NULL)
 141         {
 142           if (!_wcsicmp(DriverList->Name, Name))
 143             {
 144               Driver = DriverList;
 145               DriverList = DriverList->Next;
 146             }
 147           else
 148             {
 149               Driver = DriverList;
 150               while (Driver->Next && _wcsicmp(Driver->Name, Name))
 151                 {
 152                   Driver = Driver->Next;
 153                 }
 154             }
 155         }
 156     }
 157   else
 158     {
 159       if (GenericDriver != NULL)
 160         {
 161           Driver = GenericDriver;
 162           GenericDriver = NULL;
 163         }
 164     }
 165
 166   if (Driver != NULL)
 167     {
 168       ExFreePool(Driver->Name);
 169       ExFreePool(Driver);
 170
 171       return  TRUE;
 172     }
 173   else
 174     {
 175       return  FALSE;
 176     }
 177 }
 178
 179 INT  DRIVER_ReferenceDriver (LPCWSTR  Name)
 180 {
 181   GRAPHICS_DRIVER *Driver = DriverList;
 182
 183   while (Driver && Name)
 184     {
 185       if (!_wcsicmp( Driver->Name, Name))
 186         {
 187           return ++Driver->ReferenceCount;
 188         }
 189       Driver = Driver->Next;
 190     }
 191
 192   return  GenericDriver ? ++GenericDriver->ReferenceCount : 0;
 193 }
 194
 195 INT  DRIVER_UnreferenceDriver (LPCWSTR  Name)
 196 {
 197   GRAPHICS_DRIVER *Driver = DriverList;
 198
 199   while (Driver && Name)
 200     {
 201       if (!_wcsicmp( Driver->Name, Name))
 202         {
 203           return --Driver->ReferenceCount;
 204         }
 205       Driver = Driver->Next;
 206     }
 207
 208   return  GenericDriver ? --GenericDriver->ReferenceCount : 0;
 209 }
 210