FILE: add file subsystem and move string to ntru_string subs.

src/ntru_string.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2014 FH Bielefeld
+ *
+ * This file is part of a FH Bielefeld project.
+ *
+ * This 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301  USA
+ */
+
+/**
+ * @file ntru_string.h
+ * Header for the external API of ntru_string.c.
+ * @brief header for ntru_string.c
+ */
+
+#ifndef NTRU_STRING_H
+#define NTRU_STRING_H
+
+
+#include <stdlib.h>
+
+
+typedef struct string string;
+
+
+/**
+ * Represents a string.
+ */
+struct string {
+	/**
+	 * Pointer to the char array,
+	 * holding the actual string.
+	 */
+	char *ptr;
+	/**
+	 * Length of the string.
+	 */
+	size_t len;
+};
+
+
+#endif /* NTRU_STRING_H */