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diff --git a/src/charon/lib/definitions.h b/src/charon/lib/definitions.h
new file mode 100644
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+++ b/src/charon/lib/definitions.h
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+/**
+ * @file definitions.h
+ * 
+ * @brief General purpose definitions and macros.
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 1998, 1999  D. Hugh Redelmeier. (Endian stuff)
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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 General Public License
+ * for more details.
+ */
+
+#ifndef DEFINITIONS_H_
+#define DEFINITIONS_H_
+
+
+
+/* stolen from strongswan */
+#if linux
+# if defined(i386) && !defined(__i386__)
+#  define __i386__ 1
+#  define MYHACKFORTHIS 1
+# endif
+# include <endian.h>
+# ifdef MYHACKFORTHIS
+#  undef __i386__
+#  undef MYHACKFORTHIS
+# endif
+#elif !(defined(BIG_ENDIAN) && defined(LITTLE_ENDIAN) && defined(BYTE_ORDER))
+ /* we don't know how to do this, so we require the macros to be defined
+  * with compiler flags:
+  *    -DBIG_ENDIAN=4321 -DLITTLE_ENDIAN=1234 -DBYTE_ORDER=BIG_ENDIAN
+  * or -DBIG_ENDIAN=4321 -DLITTLE_ENDIAN=1234 -DBYTE_ORDER=LITTLE_ENDIAN
+  * Thse match the GNU definitions
+  */
+# include <sys/endian.h>
+#endif
+
+#ifndef BIG_ENDIAN
+ #error "BIG_ENDIAN must be defined"
+#endif
+
+#ifndef LITTLE_ENDIAN
+ #error "LITTLE_ENDIAN must be defined"
+#endif
+
+#ifndef BYTE_ORDER
+ #error "BYTE_ORDER must be defined"
+#endif
+
+
+/**
+ * Macro gives back larger of two values.
+ */
+#define max(x,y) (x > y ? x : y)
+
+/**
+ * Macro gives back smaller of two values.
+ */
+#define min(x,y) (x < y ? x : y)
+
+/**
+ * Debug macro to follow control flow
+ */
+#define POS printf("%s, line %d\n", __FILE__, __LINE__)
+
+/**
+ * Macro to allocate a sized type.
+ * 
+ * @param thing 	object on which a sizeof is performed
+ * @return 			poiner to allocated memory
+ */
+#define malloc_thing(thing) ((thing*)malloc(sizeof(thing)))
+
+
+/**
+ * Mapping entry which defines the end of a mapping_t array.
+ */
+#define MAPPING_END (-1)
+
+typedef struct mapping_t mapping_t;
+
+/**
+ * @brief Mapping entry, where enum-to-string mappings are stored.
+ */
+struct mapping_t
+{
+	/**
+	 * Enumeration value.
+	 */
+	int value;
+	
+	/**
+	 * Mapped string.
+	 */
+	char *string;
+};
+
+
+/**
+ * @brief Find a mapping_string in the mapping[].
+ * 
+ * @param mappings		mappings array
+ * @param value			enum-value to get the string from
+ * 
+ */
+char *mapping_find(mapping_t *mappings, int value);
+
+#endif /*DEFINITIONS_H_*/