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diff --git a/RSM/asn1codec/e2ap_engine/asn_internal.c b/RSM/asn1codec/e2ap_engine/asn_internal.c
new file mode 100644
index 0000000..a8eb453
--- /dev/null
+++ b/RSM/asn1codec/e2ap_engine/asn_internal.c
@@ -0,0 +1,67 @@
+/*
+ *
+ * Copyright 2019 AT&T Intellectual Property
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+
+#include <asn_internal.h>
+
+ssize_t
+asn__format_to_callback(int (*cb)(const void *, size_t, void *key), void *key,
+                        const char *fmt, ...) {
+    char scratch[64];
+    char *buf = scratch;
+    size_t buf_size = sizeof(scratch);
+    int wrote;
+    int cb_ret;
+
+    do {
+        va_list args;
+        va_start(args, fmt);
+
+        wrote = vsnprintf(buf, buf_size, fmt, args);
+        if(wrote < (ssize_t)buf_size) {
+            if(wrote < 0) {
+                if(buf != scratch) FREEMEM(buf);
+		va_end(args);
+                return -1;
+            }
+            break;
+        }
+
+        buf_size <<= 1;
+        if(buf == scratch) {
+            buf = MALLOC(buf_size);
+            if(!buf) return -1;
+        } else {
+            void *p = REALLOC(buf, buf_size);
+            if(!p) {
+                FREEMEM(buf);
+                return -1;
+            }
+            buf = p;
+        }
+    } while(1);
+
+    cb_ret = cb(buf, wrote, key);
+    if(buf != scratch) FREEMEM(buf);
+    if(cb_ret < 0) {
+        return -1;
+    }
+
+    return wrote;
+}
+