[FREELDR] Implement 'SeekRelative' mode for the *Seek() methods for disks & filesystems.

[reactos.git] / boot / freeldr / freeldr / lib / fs / ntfs.c

diff --git a/boot/freeldr/freeldr/lib/fs/ntfs.c b/boot/freeldr/freeldr/lib/fs/ntfs.c
index e6f7b25..bc2e6bf 100644 (file)
--- a/boot/freeldr/freeldr/lib/fs/ntfs.c
+++ b/boot/freeldr/freeldr/lib/fs/ntfs.c
@@ -846,17 +846,24 @@ ARC_STATUS NtfsRead(ULONG FileId, VOID* Buffer, ULONG N, ULONG* Count)
 ARC_STATUS NtfsSeek(ULONG FileId, LARGE_INTEGER* Position, SEEKMODE SeekMode)
 {
     PNTFS_FILE_HANDLE FileHandle = FsGetDeviceSpecific(FileId);
+    LARGE_INTEGER NewPosition = *Position;
 
-    TRACE("NtfsSeek() NewFilePointer = %lu\n", Position->LowPart);
+    switch (SeekMode)
+    {
+        case SeekAbsolute:
+            break;
+        case SeekRelative:
+            NewPosition.QuadPart += FileHandle->Offset;
+            break;
+        default:
+            ASSERT(FALSE);
+            return EINVAL;
+    }
 
-    if (SeekMode != SeekAbsolute)
-        return EINVAL;
-    if (Position->HighPart != 0)
-        return EINVAL;
-    if (Position->LowPart >= (ULONG)NtfsGetAttributeSize(&FileHandle->DataContext->Record))
+    if (NewPosition.QuadPart >= NtfsGetAttributeSize(&FileHandle->DataContext->Record))
         return EINVAL;
 
-    FileHandle->Offset = Position->LowPart;
+    FileHandle->Offset = NewPosition.QuadPart;
     return ESUCCESS;
 }