https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b1eab36f6bed95fd08de770d07645e933c29f729
commit b1eab36f6bed95fd08de770d07645e933c29f729 Author: Trevor Thompson <[email protected]> AuthorDate: Thu Jul 27 18:34:23 2017 +0000 [NTFS] - Add GetAllocationOffsetFromVCN() function, which was mistakenly left out of the last commit. svn path=/branches/GSoC_2016/NTFS/; revision=75425 --- drivers/filesystems/ntfs/btree.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/filesystems/ntfs/btree.c b/drivers/filesystems/ntfs/btree.c index 38fa9aefee..f4bdf909a1 100644 --- a/drivers/filesystems/ntfs/btree.c +++ b/drivers/filesystems/ntfs/btree.c @@ -511,6 +511,18 @@ DumpBTree(PB_TREE Tree) DumpBTreeNode(Tree->RootNode, 0, 0); } +// Calculates start of Index Buffer relative to the index allocation, given the node's VCN +ULONGLONG +GetAllocationOffsetFromVCN(PDEVICE_EXTENSION DeviceExt, + ULONG IndexBufferSize, + ULONGLONG Vcn) +{ + if (IndexBufferSize < DeviceExt->NtfsInfo.BytesPerCluster) + return Vcn * DeviceExt->NtfsInfo.BytesPerSector; + + return Vcn * DeviceExt->NtfsInfo.BytesPerCluster; +} + /** * @name NtfsInsertKey * @implemented
