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[VFATLIB]

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- Determine the correct FAT type based on the size and offset of the partition if the current type is not a FAT type (another FS type or unformatted)
- Formatting a floppy, blank partition, or other non-FAT formatted partition from within ROS no longer fails

svn path=/trunk/; revision=52278
This commit is contained in:
Cameron Gutman 2011-06-16 14:32:49 +00:00
parent e9ba759f3d
commit 9b11cad5e8
1 changed files with 52 additions and 0 deletions
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52
reactos/lib/fslib/vfatlib/vfatlib.c
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@ -127,6 +127,58 @@ VfatFormat(IN PUNICODE_STRING DriveRoot,
PartitionInfo.RewritePartition = FALSE;
PartitionInfo.RecognizedPartition = FALSE;
}
/* If it already has a FAT FS, we'll use that type.
* If it doesn't, we will determine the FAT type based on size and offset */
if (PartitionInfo.PartitionType != PARTITION_FAT_12 &&
PartitionInfo.PartitionType != PARTITION_FAT_16 &&
PartitionInfo.PartitionType != PARTITION_HUGE &&
PartitionInfo.PartitionType != PARTITION_XINT13 &&
PartitionInfo.PartitionType != PARTITION_FAT32 &&
PartitionInfo.PartitionType != PARTITION_FAT32_XINT13)
{
/* Determine the correct type based upon size and offset (copied from usetup) */
if (PartitionInfo.PartitionLength.QuadPart < (4200LL * 1024LL))
{
/* FAT12 CHS partition (disk is smaller than 4.1MB) */
PartitionInfo.PartitionType = PARTITION_FAT_12;
}
else if (PartitionInfo.StartingOffset.QuadPart < (1024LL * 255LL * 63LL * 512LL))
{
/* Partition starts below the 8.4GB boundary ==> CHS partition */
if (PartitionInfo.PartitionLength.QuadPart < (32LL * 1024LL * 1024LL))
{
/* FAT16 CHS partition (partiton size < 32MB) */
PartitionInfo.PartitionType = PARTITION_FAT_16;
}
else if (PartitionInfo.PartitionLength.QuadPart < (512LL * 1024LL * 1024LL))
{
/* FAT16 CHS partition (partition size < 512MB) */
PartitionInfo.PartitionType = PARTITION_HUGE;
}
else
{
/* FAT32 CHS partition (partition size >= 512MB) */
PartitionInfo.PartitionType = PARTITION_FAT32;
}
}
else
{
/* Partition starts above the 8.4GB boundary ==> LBA partition */
if (PartitionInfo.PartitionLength.QuadPart < (512LL * 1024LL * 1024LL))
{
/* FAT16 LBA partition (partition size < 512MB) */
PartitionInfo.PartitionType = PARTITION_XINT13;
}
else
{
/* FAT32 LBA partition (partition size >= 512MB) */
PartitionInfo.PartitionType = PARTITION_FAT32_XINT13;
}
}
}
DPRINT("PartitionType 0x%x\n", PartitionInfo.PartitionType);
DPRINT("StartingOffset %I64d\n", PartitionInfo.StartingOffset.QuadPart);