Merge pull request squid-box#144 from bneidhold/dev

Fix for Seek implementation with SeekOrigin.End

Author: squid-box

SevenZip/StreamWrappers.cs

@@ -304,9 +304,20 @@ private int StreamNumberByOffset(long offset)
 
         public void Seek(long offset, SeekOrigin seekOrigin, IntPtr newPosition)
         {
-            long absolutePosition = (seekOrigin == SeekOrigin.Current)
-                                        ? Position + offset
-                                        : offset;
+            long absolutePosition;
+            switch (seekOrigin) {
+                case SeekOrigin.Begin:
+                    absolutePosition = offset;
+                    break;
+                case SeekOrigin.Current:
+                    absolutePosition = Position + offset;
+                    break;
+                case SeekOrigin.End:
+                    absolutePosition = Length + offset;
+                    break;
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(seekOrigin));
+            }
             CurrentStream = StreamNumberByOffset(absolutePosition);
             long delta = Streams[CurrentStream].Seek(
                 absolutePosition - StreamOffsets[CurrentStream].Key, SeekOrigin.Begin);