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diff --git a/lib/minitasn1/gstr.c b/lib/minitasn1/gstr.c
new file mode 100644
index 0000000000..d8c83a1630
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+++ b/lib/minitasn1/gstr.c
@@ -0,0 +1,77 @@
+/*
+ *      Copyright (C) 2002 Nikos Mavroyanopoulos
+ *
+ * This file is part of LIBASN1.
+ *
+ * The LIBTASN1 library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public   
+ * License as published by the Free Software Foundation; either 
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ */
+
+#include <int.h>
+
+/* These function are like strcat, strcpy. They only
+ * do bound checking (they shouldn't cause buffer overruns),
+ * and they always produce null terminated strings.
+ *
+ * They should be used only with null terminated strings.
+ */
+void _asn1_str_cat( char* dest, size_t dest_tot_size, const char* src) {
+size_t str_size = strlen(src);
+size_t dest_size = strlen(dest);
+
+	if ( dest_tot_size - dest_size > str_size) {
+		strcat( dest, src);
+	} else {
+		if ( dest_tot_size - dest_size > 0) {
+			strncat( dest, src, (dest_tot_size - dest_size) -1);
+			dest[dest_tot_size-1] = 0;
+		}
+	}
+}
+
+void _asn1_str_cpy( char* dest, size_t dest_tot_size, const char* src) {
+size_t str_size = strlen(src);
+
+	if ( dest_tot_size > str_size) {
+		strcpy( dest, src);
+	} else {
+		if ( dest_tot_size > 0) {
+			strncpy( dest, src, (dest_tot_size) -1);
+			dest[dest_tot_size-1] = 0;
+		}
+	}
+}
+
+void _asn1_mem_cpy( char* dest, size_t dest_tot_size, const char* src, size_t src_size) 
+{
+
+	if ( dest_tot_size >= src_size) {
+		memcpy( dest, src, src_size);
+	} else {
+		if ( dest_tot_size > 0) {
+			memcpy( dest, src, dest_tot_size);
+		}
+	}
+}
+
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