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- Fixed the intial values for cluster 0 and 1.

Browse source 
- Write the fat in larger chunks.
- Calculate the necessary size for the fat more exactly.

svn path=/trunk/; revision=5676
This commit is contained in:
Hartmut Birr 2003-08-19 17:51:12 +00:00
parent 02a714f2b9
commit 57a76c0f45
1 changed files with 39 additions and 16 deletions
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55
reactos/lib/fslib/vfatlib/vfatlib.c
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@ -172,27 +172,29 @@ VfatWriteFAT(IN HANDLE FileHandle,
PUCHAR Buffer;
LARGE_INTEGER FileOffset;
ULONG i;
ULONG Size;
ULONG Sectors;
/* Allocate buffer */
Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
0,
BootSector->BytesPerSector);
64 * 1024);
if (Buffer == NULL)
return(STATUS_INSUFFICIENT_RESOURCES);
/* Zero the buffer */
memset(Buffer, 0, BootSector->BytesPerSector);
memset(Buffer, 0, 64 * 1024);
/* FAT cluster 0 */
Buffer[0] = 0xf8; /* Media type */
Buffer[1] = 0xff;
Buffer[2] = 0xff;
Buffer[3] = 0xff;
Buffer[3] = 0x0f;
/* FAT cluster 1 */
Buffer[4] = 0xcf; /* Clean shutdown, no disk read/write errors, end-of-cluster (EOC) mark */
Buffer[4] = 0xff; /* Clean shutdown, no disk read/write errors, end-of-cluster (EOC) mark */
Buffer[5] = 0xff;
Buffer[6] = 0xff;
Buffer[7] = 0xf7;
Buffer[7] = 0x0f;
/* FAT cluster 2 */
Buffer[8] = 0xff; /* End of root directory */
Buffer[9] = 0xff;
@ -217,21 +219,28 @@ VfatWriteFAT(IN HANDLE FileHandle,
return(Status);
}
/* Zero the buffer */
memset(Buffer, 0, BootSector->BytesPerSector);
/* Zero the begin of the buffer */
memset(Buffer, 0, 12);
/* Zero the rest of the FAT */
for (i = 1; i < BootSector->FATSectors32 - 1; i++)
Sectors = 64 * 1024 / BootSector->BytesPerSector;
for (i = 1; i < BootSector->FATSectors32; i += Sectors)
{
/* Zero one sector of the FAT */
/* Zero some sectors of the FAT */
FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors + i) * BootSector->BytesPerSector;
Size = BootSector->FATSectors32 - i;
if (Size > Sectors)
{
Size = Sectors;
}
Size *= BootSector->BytesPerSector;
Status = NtWriteFile(FileHandle,
NULL,
NULL,
NULL,
&IoStatusBlock,
Buffer,
BootSector->BytesPerSector,
Size,
&FileOffset,
NULL);
if (!NT_SUCCESS(Status))
@ -332,6 +341,7 @@ VfatFormat(
ULONG RootDirSectors;
ULONG TmpVal1;
ULONG TmpVal2;
ULONG TmpVal3;
DPRINT("VfatFormat(DriveRoot '%S')\n", DriveRoot->Buffer);
@ -376,7 +386,7 @@ VfatFormat(
DPRINT("TracksPerCylinder %d\n", DiskGeometry.TracksPerCylinder);
DPRINT("SectorsPerTrack %d\n", DiskGeometry.SectorsPerTrack);
DPRINT("BytesPerSector %d\n", DiskGeometry.BytesPerSector);
DPRINT("DiskSize %d\n",
DPRINT("DiskSize %I64d\n",
DiskGeometry.Cylinders.QuadPart *
(ULONGLONG)DiskGeometry.TracksPerCylinder *
(ULONGLONG)DiskGeometry.SectorsPerTrack *
@ -400,8 +410,8 @@ VfatFormat(
}
DPRINT("PartitionType 0x%x\n", PartitionInfo.PartitionType);
DPRINT("StartingOffset %d\n", PartitionInfo.StartingOffset);
DPRINT("PartitionLength %d\n", PartitionInfo.PartitionLength);
DPRINT("StartingOffset %I64d\n", PartitionInfo.StartingOffset);
DPRINT("PartitionLength %I64d\n", PartitionInfo.PartitionLength);
DPRINT("HiddenSectors %d\n", PartitionInfo.HiddenSectors);
DPRINT("PartitionNumber %d\n", PartitionInfo.PartitionNumber);
DPRINT("BootIndicator 0x%x\n", PartitionInfo.BootIndicator);
@ -459,9 +469,22 @@ VfatFormat(
TmpVal2 = (256 * BootSector.SectorsPerCluster) + BootSector.FATCount;
if (TRUE /* FAT32 */)
{
TmpVal2 /= 2;
BootSector.FATSectors = 0;
BootSector.FATSectors32 = (TmpVal1 + (TmpVal2 - 1)) / TmpVal2;
TmpVal2 = 0;
do
{
if (TmpVal2 == 0)
{
TmpVal3 = 0xffffffff;
}
else
{
TmpVal3 = TmpVal2;
}
TmpVal2 = ((TmpVal1 - TmpVal2 * BootSector.FATCount) / BootSector.SectorsPerCluster) + 2;
TmpVal2 = (sizeof(ULONG) * TmpVal2 + BootSector.BytesPerSector - 1) / BootSector.BytesPerSector;
}
while (TmpVal3 > TmpVal2);
BootSector.FATSectors32 = TmpVal2;
}
Status = VfatWriteBootSector(FileHandle,