+/* fmt_rfc2047.h -- decode RFC-2047 header format
+ *
+ * This code is Copyright (c) 2017, by the authors of nmh. See the
+ * COPYRIGHT file in the root directory of the nmh distribution for
+ * complete copyright information. */
+
+/*
+ * Decode two characters into their quoted-printable representation.
+ *
+ * Arguments are:
+ *
+ * byte1 - First character of Q-P representation
+ * byte2 - Second character of Q-P representation
+ *
+ * Returns the decoded value, -1 if the conversion failed.
+ */
+int decode_qp(unsigned char byte1, unsigned char byte2) CONST;
+
+int decode_rfc2047(char *, char *, size_t);