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diff --git a/Source/lib/definitions.h b/Source/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
+
+
+
+/**
+ * @defgroup config config
+ * 
+ * Classes implementing configuration related things.
+ */
+
+/**
+ * @defgroup encoding encoding
+ * 
+ * Classes used to encode and decode IKEv2 messages.
+ */
+
+/**
+ * @defgroup network network
+ * 
+ * Classes for network relevant stuff.
+ */
+ 
+ /**
+ * @defgroup payloads payloads
+ * 
+ * Classes representing specific IKEv2 payloads.
+ * 
+ * @ingroup encoding
+ */
+
+/**
+ * @defgroup sa sa
+ * 
+ * Security association and helper classes.
+ */
+
+
+/**
+ * @defgroup states states
+ *
+ * Varius states in which an IKE SA can be.
+ *
+ * @ingroup sa
+ */
+
+/**
+ * @defgroup queues queues
+ * 
+ * Different kind of queues.
+ */
+ 
+ /**
+  * @defgroup jobs jobs
+  * 
+  * Jobs used in job queue and event queue.
+  * 
+  * @ingroup queues
+  */
+
+/**
+ * @defgroup testcases testcases
+ * 
+ * Testcases used to test the different classes in seperate module tests.
+ */
+
+/**
+ * @defgroup transforms transforms
+ * 
+ * Transform algorithms of different kind.
+ */
+ 
+/**
+ * @defgroup rsa rsa
+ * 
+ * RSA public key algorithm.
+ * 
+ * @ingroup transforms
+ */
+ 
+/**
+ * @defgroup prfs prfs
+ * 
+ * Pseudo random functions.
+ * 
+ * @ingroup transforms
+ */
+
+/**
+ * @defgroup signers signers
+ * 
+ * Symmetric signing algorithms, used to ensure message integrity.
+ * 
+ * @ingroup transforms
+ */
+
+/**
+ * @defgroup crypters crypters
+ * 
+ * Symmetric encryption algorithms, used to encrypt and decrypt.
+ * 
+ * @ingroup transforms
+ */
+ 
+/**
+ * @defgroup hashers hashers
+ * 
+ * Hashing algorithms.
+ * 
+ * @ingroup transforms
+ */
+/**
+ * @defgroup asn1 asn1
+ * 
+ * ASN1 structure definition, en-/decoder of for DER
+ * 
+ * @todo Implement a der_encoder_t class.
+ */
+ 
+/**
+ * @defgroup utils utils
+ * 
+ * Generic helper classes.
+ */
+  
+/**
+ * @defgroup threads threads
+ * 
+ * Threaded classes, which will do their job alone.
+ */
+ 
+/**
+ * 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__)
+
+/**
+ * Papping 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_*/