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+/**
+ * @file der_decoder.h
+ *
+ * @brief Interface of der_decoder_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 DER_DECODER_H_
+#define DER_DECODER_H_
+
+#include <types.h>
+#include <asn1/asn1.h>
+
+typedef struct der_decoder_t der_decoder_t;
+
+/**
+ * @brief Decode ASN1 DER encoded chunks.
+ *
+ * @b Constructors:
+ * - der_decoder_create()
+ *
+ * @todo A lot.
+ *
+ * @ingroup asn1
+ */
+struct der_decoder_t {
+
+ /**
+ * @brief Decode a chunk of bytes to a data structure
+ *
+ * @param der_decoder calling object
+ * @param input chunk of data to decode
+ * @param output data structure where decoded data is written
+ * @return
+ * - PARSE_ERROR
+ * - FAILED
+ * - NOT_SUPPORTED
+ * - or SUCCESS sometimes
+ */
+ status_t (*decode) (der_decoder_t *this, chunk_t input, void *output);
+
+ /**
+ * @brief Destroys a der_decoder object.
+ *
+ * @param der_decoder calling object
+ */
+ void (*destroy) (der_decoder_t *this);
+};
+
+
+/**
+ * @brief Create a der_decoder instance.
+ *
+ * The instance needs ASN1 rules to know how to decode
+ * data...
+ *
+ * @param rules set of ASN1 coding rules
+ * @return der_decoder_t object
+ *
+ * @ingroup ans1
+ */
+der_decoder_t * der_decoder_create(asn1_rule_t* rules);
+
+#endif /* DER_DECODER_H_ */