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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/hashers/hash_algorithm_set.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2015 Tobias Brunner
                      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: #include "hash_algorithm_set.h"
                     17: 
                     18: #include <collections/array.h>
                     19: 
                     20: typedef struct private_hash_algorithm_set_t private_hash_algorithm_set_t;
                     21: 
                     22: struct private_hash_algorithm_set_t {
                     23: 
                     24:        /**
                     25:         * Public interface
                     26:         */
                     27:        hash_algorithm_set_t public;
                     28: 
                     29:        /**
                     30:         * Algorithms contained in the set
                     31:         */
                     32:        array_t *algorithms;
                     33: };
                     34: 
                     35: /**
                     36:  * Sort hash algorithms
                     37:  */
                     38: static int hash_sort(const void *a, const void *b, void *user)
                     39: {
                     40:        const hash_algorithm_t *ha = a, *hb = b;
                     41:        return *ha - *hb;
                     42: }
                     43: 
                     44: /**
                     45:  * Find a hash algorithm
                     46:  */
                     47: static int hash_find(const void *a, const void *b)
                     48: {
                     49:        return hash_sort(a, b, NULL);
                     50: }
                     51: 
                     52: METHOD(hash_algorithm_set_t, contains, bool,
                     53:        private_hash_algorithm_set_t *this, hash_algorithm_t hash)
                     54: {
                     55:        return array_bsearch(this->algorithms, &hash, hash_find, NULL) != -1;
                     56: }
                     57: 
                     58: METHOD(hash_algorithm_set_t, add, void,
                     59:        private_hash_algorithm_set_t *this, hash_algorithm_t hash)
                     60: {
                     61:        if (!contains(this, hash))
                     62:        {
                     63:                array_insert(this->algorithms, ARRAY_TAIL, &hash);
                     64:                array_sort(this->algorithms, hash_sort, NULL);
                     65:        }
                     66: }
                     67: 
                     68: METHOD(hash_algorithm_set_t, count, int,
                     69:        private_hash_algorithm_set_t *this)
                     70: {
                     71:        return array_count(this->algorithms);
                     72: }
                     73: 
                     74: CALLBACK(hash_filter, bool,
                     75:        void *data, enumerator_t *orig, va_list args)
                     76: {
                     77:        hash_algorithm_t *algo, *out;
                     78: 
                     79:        VA_ARGS_VGET(args, out);
                     80: 
                     81:        if (orig->enumerate(orig, &algo))
                     82:        {
                     83:                *out = *algo;
                     84:                return TRUE;
                     85:        }
                     86:        return FALSE;
                     87: }
                     88: 
                     89: METHOD(hash_algorithm_set_t, create_enumerator, enumerator_t*,
                     90:        private_hash_algorithm_set_t *this)
                     91: {
                     92:        return enumerator_create_filter(array_create_enumerator(this->algorithms),
                     93:                                                                        hash_filter, NULL, NULL);
                     94: }
                     95: 
                     96: METHOD(hash_algorithm_set_t, destroy, void,
                     97:        private_hash_algorithm_set_t *this)
                     98: {
                     99:        array_destroy(this->algorithms);
                    100:        free(this);
                    101: }
                    102: 
                    103: /**
                    104:  * Described in header
                    105:  */
                    106: hash_algorithm_set_t *hash_algorithm_set_create()
                    107: {
                    108:        private_hash_algorithm_set_t *this;
                    109: 
                    110:        INIT(this,
                    111:                .public = {
                    112:                        .add = _add,
                    113:                        .contains = _contains,
                    114:                        .count = _count,
                    115:                        .create_enumerator = _create_enumerator,
                    116:                        .destroy = _destroy,
                    117:                },
                    118:                .algorithms = array_create(sizeof(hash_algorithm_t), 0),
                    119:        );
                    120: 
                    121:        return &this->public;
                    122: }