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- Fixed the calculation of the start for a partition within an extended partition.

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svn path=/trunk/; revision=9430
This commit is contained in:
Hartmut Birr
2004-05-17 20:20:17 +00:00
parent 3128a0aff7
commit d462152e6d
1 changed files with 10 additions and 6 deletions
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freeldr/freeldr/disk/partition.c
+10 -6
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@@ -81,7 +81,7 @@ BOOL DiskGetPartitionEntry(U32 DriveNumber, U32 PartitionNumber, PPARTITION_TABL
MASTER_BOOT_RECORD MasterBootRecord;
PARTITION_TABLE_ENTRY ExtendedPartitionTableEntry;
U32 ExtendedPartitionNumber;
U32 ExtendedPartitionRelativeOffset;
U32 ExtendedPartitionOffset;
U32 Index;
// Read master boot record
@@ -113,7 +113,7 @@ BOOL DiskGetPartitionEntry(U32 DriveNumber, U32 PartitionNumber, PPARTITION_TABL
// Set the initial relative starting sector to 0
// This is because extended partition starting
// sectors a numbered relative to their parent
ExtendedPartitionRelativeOffset = 0;
ExtendedPartitionOffset = 0;
for (Index=0; Index<=ExtendedPartitionNumber; Index++)
{
@@ -124,10 +124,14 @@ BOOL DiskGetPartitionEntry(U32 DriveNumber, U32 PartitionNumber, PPARTITION_TABL
}
// Adjust the relative starting sector of the partition
ExtendedPartitionRelativeOffset += ExtendedPartitionTableEntry.SectorCountBeforePartition;
ExtendedPartitionTableEntry.SectorCountBeforePartition += ExtendedPartitionOffset;
if (ExtendedPartitionOffset == 0)
{
// Set the start of the parrent extended partition
ExtendedPartitionOffset = ExtendedPartitionTableEntry.SectorCountBeforePartition;
}
// Read the partition boot record
if (!DiskReadBootRecord(DriveNumber, ExtendedPartitionRelativeOffset, &MasterBootRecord))
if (!DiskReadBootRecord(DriveNumber, ExtendedPartitionTableEntry.SectorCountBeforePartition, &MasterBootRecord))
{
return FALSE;
}
@@ -139,7 +143,7 @@ BOOL DiskGetPartitionEntry(U32 DriveNumber, U32 PartitionNumber, PPARTITION_TABL
}
// Now correct the start sector of the partition
PartitionTableEntry->SectorCountBeforePartition += ExtendedPartitionRelativeOffset;
PartitionTableEntry->SectorCountBeforePartition += ExtendedPartitionTableEntry.SectorCountBeforePartition;
}
// When we get here we should have the correct entry