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Diffstat (limited to 'FatPkg/EnhancedFatDxe/Misc.c')
| -rw-r--r-- | FatPkg/EnhancedFatDxe/Misc.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/FatPkg/EnhancedFatDxe/Misc.c b/FatPkg/EnhancedFatDxe/Misc.c new file mode 100644 index 0000000000..a06914fd19 --- /dev/null +++ b/FatPkg/EnhancedFatDxe/Misc.c @@ -0,0 +1,409 @@ +/*++
+
+Copyright (c) 2005, Intel Corporation
+All rights reserved. This program and the accompanying materials are licensed and made available
+under the terms and conditions of the BSD License which accompanies this
+distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+Module Name:
+
+ Misc.c
+
+Abstract:
+
+ Miscellaneous functions
+
+Revision History
+
+--*/
+
+#include "Fat.h"
+
+EFI_STATUS
+FatAccessVolumeDirty (
+ IN FAT_VOLUME *Volume,
+ IN IO_MODE IoMode,
+ IN VOID *DirtyValue
+ )
+/*++
+
+Routine Description:
+
+ Set the volume as dirty or not
+
+Arguments:
+
+ Volume - FAT file system volume.
+ IoMode - The access mode.
+ DirtyValue - Set the volume as dirty or not.
+
+Returns:
+
+ EFI_SUCCESS - Set the new FAT entry value sucessfully.
+ other - An error occurred when operation the FAT entries.
+
+--*/
+{
+ UINTN WriteCount;
+
+ WriteCount = Volume->FatEntrySize;
+ return FatDiskIo (Volume, IoMode, Volume->FatPos + WriteCount, WriteCount, DirtyValue);
+}
+
+EFI_STATUS
+FatDiskIo (
+ IN FAT_VOLUME *Volume,
+ IN IO_MODE IoMode,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ IN OUT VOID *Buffer
+ )
+/*++
+
+Routine Description:
+
+ General disk access function
+
+Arguments:
+
+ Volume - FAT file system volume.
+ IoMode - The access mode (disk read/write or cache access).
+ Offset - The starting byte offset to read from.
+ BufferSize - Size of Buffer.
+ Buffer - Buffer containing read data.
+
+Returns:
+
+ EFI_SUCCESS - The operation is performed successfully.
+ EFI_VOLUME_CORRUPTED - The accesss is
+ Others - The status of read/write the disk
+
+--*/
+{
+ EFI_STATUS Status;
+ EFI_DISK_IO_PROTOCOL *DiskIo;
+ EFI_DISK_READ IoFunction;
+
+ //
+ // Verify the IO is in devices range
+ //
+ Status = EFI_VOLUME_CORRUPTED;
+ if (Offset + BufferSize <= Volume->VolumeSize) {
+ if (CACHE_ENABLED (IoMode)) {
+ //
+ // Access cache
+ //
+ Status = FatAccessCache (Volume, CACHE_TYPE (IoMode), RAW_ACCESS (IoMode), Offset, BufferSize, Buffer);
+ } else {
+ //
+ // Access disk directly
+ //
+ DiskIo = Volume->DiskIo;
+ IoFunction = (IoMode == READ_DISK) ? DiskIo->ReadDisk : DiskIo->WriteDisk;
+ Status = IoFunction (DiskIo, Volume->MediaId, Offset, BufferSize, Buffer);
+ }
+ }
+
+ if (EFI_ERROR (Status)) {
+ Volume->DiskError = TRUE;
+ DEBUG ((EFI_D_INFO, "FatDiskIo: error %r\n", Status));
+ }
+
+ return Status;
+}
+
+VOID
+FatAcquireLock (
+ VOID
+ )
+/*++
+
+Routine Description:
+
+ Lock the volume.
+
+Arguments:
+
+ None.
+
+Returns:
+
+ None.
+
+--*/
+{
+ EfiAcquireLock (&FatFsLock);
+}
+
+BOOLEAN
+FatIsLocked (
+ VOID
+ )
+/*++
+
+Routine Description:
+
+ Get the locking status of the volume.
+
+Arguments:
+
+ None.
+
+Returns:
+
+ TRUE - The volume is locked.
+ FALSE - The volume is not locked.
+
+--*/
+{
+ return (BOOLEAN) (FatFsLock.Lock);
+}
+
+VOID
+FatReleaseLock (
+ VOID
+ )
+/*++
+
+Routine Description:
+
+ Unlock the volume.
+
+Arguments:
+
+ Null.
+
+Returns:
+
+ None.
+
+--*/
+{
+ EfiReleaseLock (&FatFsLock);
+}
+
+VOID
+FatFreeDirEnt (
+ IN FAT_DIRENT *DirEnt
+ )
+/*++
+
+Routine Description:
+
+ Free directory entry.
+
+Arguments:
+
+ DirEnt - The directory entry to be freed.
+
+Returns:
+
+ None.
+
+--*/
+{
+ if (DirEnt->FileString != NULL) {
+ FreePool (DirEnt->FileString);
+ }
+
+ FreePool (DirEnt);
+}
+
+VOID
+FatFreeVolume (
+ IN FAT_VOLUME *Volume
+ )
+/*++
+
+Routine Description:
+
+ Free volume structure (including the contents of directory cache and disk cache).
+
+Arguments:
+
+ Volume - The volume structure to be freed.
+
+Returns:
+
+ None.
+
+--*/
+{
+ //
+ // Free disk cache
+ //
+ if (Volume->CacheBuffer != NULL) {
+ FreePool (Volume->CacheBuffer);
+ }
+ //
+ // Free directory cache
+ //
+ FatCleanupODirCache (Volume);
+ FreePool (Volume);
+}
+
+VOID
+FatEfiTimeToFatTime (
+ IN EFI_TIME *ETime,
+ OUT FAT_DATE_TIME *FTime
+ )
+/*++
+
+Routine Description:
+
+ Translate EFI time to FAT time.
+
+Arguments:
+
+ ETime - The time of EFI_TIME.
+ FTime - The time of FAT_DATE_TIME.
+
+Returns:
+
+ None.
+
+--*/
+{
+ //
+ // ignores timezone info in source ETime
+ //
+ if (ETime->Year > 1980) {
+ FTime->Date.Year = (UINT16) (ETime->Year - 1980);
+ }
+
+ if (ETime->Year >= 1980 + FAT_MAX_YEAR_FROM_1980) {
+ FTime->Date.Year = FAT_MAX_YEAR_FROM_1980;
+ }
+
+ FTime->Date.Month = ETime->Month;
+ FTime->Date.Day = ETime->Day;
+ FTime->Time.Hour = ETime->Hour;
+ FTime->Time.Minute = ETime->Minute;
+ FTime->Time.DoubleSecond = (UINT16) (ETime->Second / 2);
+}
+
+VOID
+FatFatTimeToEfiTime (
+ IN FAT_DATE_TIME *FTime,
+ OUT EFI_TIME *ETime
+ )
+/*++
+
+Routine Description:
+
+ Translate Fat time to EFI time.
+
+Arguments:
+
+ FTime - The time of FAT_DATE_TIME.
+ ETime - The time of EFI_TIME.
+
+Returns:
+
+ None.
+
+--*/
+{
+ ETime->Year = (UINT16) (FTime->Date.Year + 1980);
+ ETime->Month = (UINT8) FTime->Date.Month;
+ ETime->Day = (UINT8) FTime->Date.Day;
+ ETime->Hour = (UINT8) FTime->Time.Hour;
+ ETime->Minute = (UINT8) FTime->Time.Minute;
+ ETime->Second = (UINT8) (FTime->Time.DoubleSecond * 2);
+ ETime->Nanosecond = 0;
+ ETime->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
+ ETime->Daylight = 0;
+}
+
+VOID
+FatGetCurrentFatTime (
+ OUT FAT_DATE_TIME *FatNow
+ )
+/*++
+
+Routine Description:
+
+ Get Current FAT time.
+
+Arguments:
+
+ FatNow - Current FAT time.
+
+Returns:
+
+ None.
+
+--*/
+{
+ EFI_TIME Now;
+ gRT->GetTime (&Now, NULL);
+ FatEfiTimeToFatTime (&Now, FatNow);
+}
+
+BOOLEAN
+FatIsValidTime (
+ IN EFI_TIME *Time
+ )
+/*++
+
+Routine Description:
+
+ Check whether a time is valid.
+
+Arguments:
+
+ Time - The time of EFI_TIME.
+
+Returns:
+
+ TRUE - The time is valid.
+ FALSE - The time is not valid.
+
+--*/
+{
+ static UINT8 MonthDays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+ UINTN Day;
+ BOOLEAN ValidTime;
+
+ ValidTime = TRUE;
+
+ //
+ // Check the fields for range problems
+ // Fat can only support from 1980
+ //
+ if (Time->Year < 1980 ||
+ Time->Month < 1 ||
+ Time->Month > 12 ||
+ Time->Day < 1 ||
+ Time->Day > 31 ||
+ Time->Hour > 23 ||
+ Time->Minute > 59 ||
+ Time->Second > 59 ||
+ Time->Nanosecond > 999999999
+ ) {
+
+ ValidTime = FALSE;
+
+ } else {
+ //
+ // Perform a more specific check of the day of the month
+ //
+ Day = MonthDays[Time->Month - 1];
+ if (Time->Month == 2 && IS_LEAP_YEAR (Time->Year)) {
+ Day += 1;
+ //
+ // 1 extra day this month
+ //
+ }
+ if (Time->Day > Day) {
+ ValidTime = FALSE;
+ }
+ }
+
+ return ValidTime;
+}
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