since the stream is not seek-able, access to Length should return exception

Author: kkguo

Diff for: src/Zip/Compression/Streams/InflaterInputStream.cs

@@ -549,7 +549,8 @@ public override bool CanWrite {
 		/// </summary>
 		public override long Length {
 			get {
-				return inputBuffer.RawLength;
+				//return inputBuffer.RawLength;
+                throw new NotSupportedException("InflaterInputStream Length is not supported");
 			}
 		}