--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/f-demime/b2q_in.c	Sat May 06 06:14:03 2023 +0000
@@ -0,0 +1,45 @@
+/*
+ * This module implements the input side of base64-to-QP conversion.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "defs.h"
+
+extern void (*dec_outf)();
+extern FILE *tempfile;
+
+static int cr_state;
+
+static void
+output_func(ch)
+{
+	if (cr_state) {
+		cr_state = 0;
+		if (ch == '\n') {
+			putc('\n', tempfile);
+			return;
+		} else
+			putc('\r', tempfile);
+	}
+	if (ch == '\r')
+		cr_state = 1;
+	else
+		putc(ch, tempfile);
+}
+
+void
+b2q_conv_init()
+{
+	dec_outf = output_func;
+	cr_state = 0;
+}
+
+void
+b2q_conv_finish()
+{
+	if (cr_state)
+		putc('\r', tempfile);
+}