drivers/filesystems/ffs/src/misc.c

   1 /*
   2  * FFS File System Driver for Windows
   3  *
   4  * misc.c
   5  *
   6  * 2004.5.6 ~
   7  *
   8  * Lee Jae-Hong, http://www.pyrasis.com
   9  *
  10  * See License.txt
  11  *
  12  */
  13
  14 #include "ntifs.h"
  15 #include "ffsdrv.h"
  16
  17 /* Globals */
  18
  19 extern PFFS_GLOBAL FFSGlobal;
  20
  21
  22 /* Definitions */
  23
  24 #ifdef ALLOC_PRAGMA
  25 #pragma alloc_text(PAGE, FFSLog2)
  26 #pragma alloc_text(PAGE, FFSSysTime)
  27 #pragma alloc_text(PAGE, FFSInodeTime)
  28 #pragma alloc_text(PAGE, FFSOEMToUnicode)
  29 #pragma alloc_text(PAGE, FFSUnicodeToOEM)
  30 #endif
  31
  32 ULONG
  33 FFSLog2(
  34         ULONG Value)
  35 {
  36         ULONG Order = 0;
  37
  38     PAGED_CODE();
  39
  40         ASSERT(Value > 0);
  41
  42         while (Value)
  43         {
  44                 Order++;
  45                 Value >>= 1;
  46         }
  47
  48         return (Order - 1);
  49 }
  50
  51
  52 LARGE_INTEGER
  53 FFSSysTime(
  54         IN ULONG i_time)
  55 {
  56         LARGE_INTEGER SysTime;
  57
  58     PAGED_CODE();
  59
  60         RtlSecondsSince1970ToTime(i_time, &SysTime);
  61
  62         return SysTime;
  63 }
  64
  65 ULONG
  66 FFSInodeTime(
  67         IN LARGE_INTEGER SysTime)
  68 {
  69         ULONG   FFSTime;
  70
  71     PAGED_CODE();
  72
  73         RtlTimeToSecondsSince1970(&SysTime, &FFSTime);
  74
  75         return FFSTime;
  76 }
  77
  78
  79 NTSTATUS
  80 FFSOEMToUnicode(
  81         IN OUT PUNICODE_STRING Unicode,
  82         IN     POEM_STRING     Oem)
  83 {
  84         NTSTATUS  Status;
  85
  86     PAGED_CODE();
  87
  88         Status = RtlOemStringToUnicodeString(
  89                         Unicode,
  90                         Oem,
  91                         FALSE);
  92
  93         if (!NT_SUCCESS(Status))
  94         {
  95                 FFSBreakPoint();
  96                 goto errorout;
  97         }
  98
  99 errorout:
 100
 101         return Status;
 102 }
 103
 104
 105 NTSTATUS
 106 FFSUnicodeToOEM(
 107         IN OUT POEM_STRING Oem,
 108         IN PUNICODE_STRING Unicode)
 109 {
 110         NTSTATUS Status;
 111
 112     PAGED_CODE();
 113
 114         Status = RtlUnicodeStringToOemString(
 115                         Oem,
 116                         Unicode,
 117                         FALSE);
 118
 119         if (!NT_SUCCESS(Status))
 120         {
 121                 FFSBreakPoint();
 122                 goto errorout;
 123         }
 124
 125 errorout:
 126
 127         return Status;
 128 }