--- /QuotedPrintableCodec.java	2023-07-05 02:58:25.970053987 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QuotedPrintableCodec.java	2023-07-05 02:58:25.970053987 +0200
@@ -186,7 +186,7 @@
                     if (u == -1 || l == -1) {
                         throw new DecoderException("Invalid quoted-printable encoding");
                     }
-                    buffer.write((char) ((u << 4) + l));
+buffer.write (  ( char )   (  ( u << l )  + l )  ) ;
                 } catch (ArrayIndexOutOfBoundsException e) {
                     throw new DecoderException("Invalid quoted-printable encoding");
                 }
