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Fixed the 'higher 4 bit fat32'-bug.

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svn path=/trunk/; revision=2266
This commit is contained in:
Hartmut Birr 2001-10-03 18:23:02 +00:00
parent 0f0199f381
commit ae6141ba18
1 changed files with 13 additions and 13 deletions
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26
reactos/drivers/fs/vfat/fat.c
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@ -1,5 +1,5 @@
/*
* $Id: fat.c,v 1.30 2001/08/14 08:06:26 hbirr Exp $
* $Id: fat.c,v 1.31 2001/10/03 18:23:02 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -72,7 +72,7 @@ Fat32GetNextCluster(PDEVICE_EXTENSION DeviceExt,
}
}
CurrentCluster = *(PULONG)(BaseAddress + (FATOffset % ChunkSize));
CurrentCluster = (*(PULONG)(BaseAddress + (FATOffset % ChunkSize))) & 0x0fffffff;
if (CurrentCluster >= 0xffffff8 && CurrentCluster <= 0xfffffff)
CurrentCluster = 0xffffffff;
CcRosReleaseCacheSegment(DeviceExt->StorageBcb, CacheSeg, TRUE);
@ -94,11 +94,11 @@ Fat16GetNextCluster(PDEVICE_EXTENSION DeviceExt,
NTSTATUS Status;
ULONG FATOffset;
ULONG ChunkSize;
ChunkSize = CACHEPAGESIZE(DeviceExt);
FATOffset = (DeviceExt->FATStart * BLOCKSIZE) + (CurrentCluster * 2);
Status = CcRosRequestCacheSegment(DeviceExt->StorageBcb,
ROUND_DOWN(FATOffset, ChunkSize),
&BaseAddress,
@ -120,7 +120,7 @@ Fat16GetNextCluster(PDEVICE_EXTENSION DeviceExt,
return(Status);
}
}
CurrentCluster = *((PUSHORT)(BaseAddress + (FATOffset % ChunkSize)));
if (CurrentCluster >= 0xfff8 && CurrentCluster <= 0xffff)
CurrentCluster = 0xffffffff;
@ -380,7 +380,7 @@ FAT32FindAvailableCluster (PDEVICE_EXTENSION DeviceExt, PULONG Cluster)
}
}
}
if (*((PULONG)(BaseAddress + ((FatStart + i) % ChunkSize))) == 0)
if (*((PULONG)(BaseAddress + ((FatStart + i) % ChunkSize))) & 0x0fffffff == 0)
{
DPRINT("Found available cluster 0x%x\n", i);
*Cluster = i / 4;
@ -605,7 +605,7 @@ FAT32CountAvailableClusters(PDEVICE_EXTENSION DeviceExt,
forto=128;
for (i = 0; i < forto; i++)
{
if (Block[i] == 0)
if (Block[i] & 0x0fffffff == 0)
ulCount++;
}
}
@ -810,7 +810,7 @@ FAT32WriteCluster(PDEVICE_EXTENSION DeviceExt,
DPRINT("Writing 0x%x for offset 0x%x 0x%x\n", NewValue, FATOffset,
ClusterToWrite);
*((PULONG)(BaseAddress + (FATOffset % ChunkSize))) = NewValue;
*((PULONG)(BaseAddress + (FATOffset % ChunkSize))) = NewValue & 0x0fffffff;
Status = VfatWriteSectors(DeviceExt->StorageDevice,
ROUND_DOWN(FATOffset, ChunkSize) / BLOCKSIZE,
ChunkSize / BLOCKSIZE,
@ -922,7 +922,7 @@ VfatRawWriteCluster(PDEVICE_EXTENSION DeviceExt,
{
Sector = ClusterToSector(DeviceExt,
Cluster);
Status = VfatWriteSectors(DeviceExt->StorageDevice,
Sector,
DeviceExt->Boot->SectorsPerCluster,
@ -941,10 +941,10 @@ GetNextCluster(PDEVICE_EXTENSION DeviceExt,
*/
{
NTSTATUS Status;
// DPRINT ("GetNextCluster(DeviceExt %x, CurrentCluster %x)\n",
// DeviceExt, CurrentCluster);
if (Extend)
{
ExAcquireResourceSharedLite(&DeviceExt->FatResource, TRUE);
@ -953,7 +953,7 @@ GetNextCluster(PDEVICE_EXTENSION DeviceExt,
{
ExAcquireResourceExclusiveLite(&DeviceExt->FatResource, TRUE);
}
/*
* If the file hasn't any clusters allocated then we need special
* handling