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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/bliss/bliss_huffman_code.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2014 Andreas Steffen
                      3:  * HSR Hochschule fuer Technik Rapperswil
                      4:  *
                      5:  * This program is free software; you can redistribute it and/or modify it
                      6:  * under the terms of the GNU General Public License as published by the
                      7:  * Free Software Foundation; either version 2 of the License, or (at your
                      8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                      9:  *
                     10:  * This program is distributed in the hope that it will be useful, but
                     11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     13:  * for more details.
                     14:  */
                     15: 
                     16: /**
                     17:  * @defgroup bliss_huffman_code bliss_huffman_code
                     18:  * @{ @ingroup bliss_p
                     19:  */
                     20: 
                     21: #ifndef BLISS_HUFFMAN_CODE_H_
                     22: #define BLISS_HUFFMAN_CODE_H_
                     23: 
                     24: #include "bliss_param_set.h"
                     25: 
                     26: #include <library.h>
                     27: 
                     28: typedef struct bliss_huffman_code_t bliss_huffman_code_t;
                     29: typedef struct bliss_huffman_code_tuple_t bliss_huffman_code_tuple_t;
                     30: typedef struct bliss_huffman_code_node_t bliss_huffman_code_node_t;
                     31: 
                     32: struct bliss_huffman_code_tuple_t {
                     33:        uint32_t code;
                     34:        uint16_t bits;
                     35: };
                     36: 
                     37: #define BLISS_HUFFMAN_CODE_NO_TUPLE            -1
                     38: #define BLISS_HUFFMAN_CODE_NO_NODE             -1
                     39: 
                     40: struct bliss_huffman_code_node_t {
                     41:        int16_t node_0;
                     42:        int16_t node_1;
                     43:        int16_t tuple;
                     44: };
                     45: 
                     46: /**
                     47:  * Defines the Huffman code for the optimum encoding of a BLISS signature
                     48:  */
                     49: struct bliss_huffman_code_t {
                     50: 
                     51:        /**
                     52:         * Range of z1:  0..n_z1-1
                     53:         */
                     54:        uint16_t n_z1;
                     55: 
                     56:        /**
                     57:         * Range of z2:  -n_z2..n_z2
                     58:         */
                     59:        uint16_t n_z2;
                     60: 
                     61:        /**
                     62:         * Table of tuple codewords
                     63:         */
                     64:        bliss_huffman_code_tuple_t *tuples;
                     65: 
                     66:        /**
                     67:         * Table of binary decision nodes
                     68:         */
                     69:        bliss_huffman_code_node_t *nodes;
                     70: };
                     71: 
                     72: /**
                     73:  * Get Optimum Huffman code for BLISS signature given by BLISS parameter set ID
                     74:  *
                     75:  * @param id   BLISS parameter set ID
                     76:  * @return             Optimum Huffman code for BLISS signature
                     77: */
                     78: bliss_huffman_code_t* bliss_huffman_code_get_by_id(bliss_param_set_id_t id);
                     79: 
                     80: #endif /** BLISS_HUFFMAN_CODE_H_ @}*/