Automatic generation of optimized Huffman codes

2014-12-09 11:58:18 +01:00
parent 7442d2a208
commit df5b2ade59
7 changed files with 559 additions and 0 deletions
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+/*
+ * Copyright (C) 2014 Andreas Steffen
+ * HSR 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.
+ */
+
+/**
+ * @defgroup bliss_huffman_code bliss_huffman_code
+ * @{ @ingroup bliss_p
+ */
+
+#ifndef BLISS_HUFFMAN_CODE_H_
+#define BLISS_HUFFMAN_CODE_H_
+
+#include "bliss_param_set.h"
+
+#include <library.h>
+
+typedef struct bliss_huffman_code_t bliss_huffman_code_t;
+typedef struct bliss_huffman_code_tuple_t bliss_huffman_code_tuple_t;
+typedef struct bliss_huffman_code_node_t bliss_huffman_code_node_t;
+
+struct bliss_huffman_code_tuple_t {
+	uint32_t code;
+	uint16_t bits;
+};
+
+struct bliss_huffman_code_node_t {
+	int16_t node_0;
+	int16_t node_1;
+	int16_t tuple;
+};
+
+/**
+ * Defines the Huffman code for the optimum encoding of a BLISS signature
+ */
+struct bliss_huffman_code_t {
+
+	/**
+	 * Range of z1:  0..n_z1-1
+	 */
+	uint16_t n_z1;
+
+	/**
+	 * Range of z2:  -n_z2..n_z2
+	 */
+	uint16_t n_z2;
+
+	/**
+	 * Table of tuple codewords
+	 */
+	bliss_huffman_code_tuple_t *tuples;
+
+	/**
+	 * Table of binary decision nodes
+	 */
+	bliss_huffman_code_node_t *nodes;
+};
+
+/**
+ * Get Optimum Huffman code for BLISS signature given by BLISS parameter set ID
+ *
+ * @param id	BLISS parameter set ID
+ * @return		Optimum Huffman code for BLISS signature
+*/
+bliss_huffman_code_t* bliss_huffman_code_get_by_id(bliss_param_set_id_t id);
+
+#endif /** BLISS_HUFFMAN_CODE_H_ @}*/