143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* $Id$
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*/
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#include "stroke_shared_key.h"
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#include <utils/linked_list.h>
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typedef struct private_stroke_shared_key_t private_stroke_shared_key_t;
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/**
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* private data of shared_key
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*/
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struct private_stroke_shared_key_t {
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/**
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* implements shared_key_t
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*/
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stroke_shared_key_t public;
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/**
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* type of this key
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*/
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shared_key_type_t type;
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/**
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* data of the key
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*/
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chunk_t key;
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/**
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* list of key owners, as identification_t
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*/
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linked_list_t *owners;
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/**
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* reference counter
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*/
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refcount_t ref;
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};
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/**
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* Implementation of shared_key_t.get_type.
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*/
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static shared_key_type_t get_type(private_stroke_shared_key_t *this)
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{
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return this->type;
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}
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/**
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* Implementation of shared_key_t.get_ref.
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*/
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static private_stroke_shared_key_t* get_ref(private_stroke_shared_key_t *this)
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{
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ref_get(&this->ref);
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return this;
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}
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/**
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* Implementation of shared_key_t.get_key.
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*/
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static chunk_t get_key(private_stroke_shared_key_t *this)
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{
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return this->key;
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}
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/**
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* Implementation of stroke_shared_key_t.has_owner.
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*/
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static id_match_t has_owner(private_stroke_shared_key_t *this, identification_t *owner)
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{
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enumerator_t *enumerator;
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id_match_t match, best = ID_MATCH_NONE;
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identification_t *current;
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enumerator = this->owners->create_enumerator(this->owners);
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while (enumerator->enumerate(enumerator, ¤t))
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{
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match = owner->matches(owner, current);
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if (match > best)
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{
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best = match;
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}
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}
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enumerator->destroy(enumerator);
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return best;
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}
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/**
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* Implementation of stroke_shared_key_t.add_owner.
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*/
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static void add_owner(private_stroke_shared_key_t *this, identification_t *owner)
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{
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this->owners->insert_last(this->owners, owner);
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}
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/**
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* Implementation of stroke_shared_key_t.destroy
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*/
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static void destroy(private_stroke_shared_key_t *this)
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{
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if (ref_put(&this->ref))
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{
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this->owners->destroy_offset(this->owners, offsetof(identification_t, destroy));
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chunk_free(&this->key);
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free(this);
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}
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}
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/**
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* create a shared key
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*/
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stroke_shared_key_t *stroke_shared_key_create(shared_key_type_t type, chunk_t key)
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{
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private_stroke_shared_key_t *this = malloc_thing(private_stroke_shared_key_t);
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this->public.shared.get_type = (shared_key_type_t(*)(shared_key_t*))get_type;
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this->public.shared.get_key = (chunk_t(*)(shared_key_t*))get_key;
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this->public.shared.get_ref = (shared_key_t*(*)(shared_key_t*))get_ref;
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this->public.shared.destroy = (void(*)(shared_key_t*))destroy;
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this->public.add_owner = (void(*)(stroke_shared_key_t*, identification_t *owner))add_owner;
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this->public.has_owner = (id_match_t(*)(stroke_shared_key_t*, identification_t *owner))has_owner;
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this->owners = linked_list_create();
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this->type = type;
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this->key = key;
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this->ref = 1;
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return &this->public;
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}
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