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