diff --git a/util/cbfstool/xdr.c b/util/cbfstool/xdr.c
index e2cafd1..df2c4ba 100644
--- a/util/cbfstool/xdr.c
+++ b/util/cbfstool/xdr.c
@@ -25,7 +25,7 @@
 #include <stdint.h>
 #include "common.h"
 
-int bgets(struct buffer *input, void *output, size_t len)
+size_t bgets(struct buffer *input, void *output, size_t len)
 {
 	len = input->size < len ? input->size : len;
 	memmove(output, input->data, len);
@@ -34,6 +34,13 @@
 	return len;
 }
 
+size_t bputs(struct buffer *b, const void *data, size_t len)
+{
+	memmove(&b->data[b->size], data, len);
+	b->size += len;
+	return len;
+}
+
 /* The assumption in all this code is that we're given a pointer to enough data.
  * Hence, we do not check for underflow.
  */