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/*
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 * Copyright (c) 2009 Lukas Mejdrech
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup packet
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 *  @{
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 */
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/** @file
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 *  Packet map and queue.
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 */
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#ifndef __NET_PACKET_H__
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#define __NET_PACKET_H__
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/** Packet identifier type.
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 *  Value zero (0) is used as an invalid identifier.
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 */
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typedef int packet_id_t;
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/** Type definition of the packet.
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 *  @see packet
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 */
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typedef struct packet * packet_t;
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/** Type definition of the packet pointer.
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 *  @see packet
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 */
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typedef packet_t *      packet_ref;
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/** @name Packet management system interface
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 */
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/*@{*/
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/** Finds the packet mapping.
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 *  @param[in] packet_id The packet identifier to be found.
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 *  @returns The found packet reference.
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 *  @returns NULL if the mapping does not exist.
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 */
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packet_t    pm_find( packet_id_t packet_id );
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/** Adds the packet mapping.
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 *  @param[in] packet The packet to be remembered.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is not valid.
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 *  @returns EINVAL if the packet map is not initialized.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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int pm_add( packet_t packet );
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/** Initializes the packet map.
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 *  @returns EOK on success.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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int pm_init( void );
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/** Releases the packet map.
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 */
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void    pm_destroy( void );
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/** Add packet to the sorted queue.
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 *  The queue is sorted in the ascending order.
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 *  The packet is inserted right before the packets of the same order value.
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 *  @param[in] first The first packet of the queue. May be NULL.
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 *  @param[in] packet The packet to be added.
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 *  @param[in] order The packet order value.
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 *  @param[in] metric The metric value of the packet.
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 *  @returns The first packet of the queue. The original first packet may be shifted by the new packet.
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 *  @returns NULL if the packet is not valid.
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 */
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packet_t    pq_add( packet_t first, packet_t packet, size_t order, size_t metric );
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/** Finds the packet with the given order.
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 *  @param[in] first The first packet of the queue.
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 *  @param[in] order The packet order value.
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 *  @returns The packet with the given order.
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 *  @returns NULL if the first packet is not valid.
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 *  @returns NULL if the packet is not found.
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 */
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packet_t    pq_find( packet_t first, size_t order );
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/** Inserts packet after the given one.
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 *  @param[in] packet The packet in the queue.
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 *  @param[in] new_packet The new packet to be inserted.
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 *  @returns EOK on success.
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 *  @returns EINVAL if etiher of the packets is invalid.
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 */
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int pq_insert_after( packet_t packet, packet_t new_packet );
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/** Detach the packet from the queue.
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 *  @param[in] packet The packet to be detached.
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 *  @returns The next packet in the queue. If the packet is the first one of the queue, this becomes the new first one.
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 *  @returns NULL if there is no packet left.
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 *  @returns NULL if the packet is not valid.
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 */
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packet_t    pq_detach( packet_t packet );
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/** Sets the packet order and metric attributes.
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 *  @param[in] packet The packet to be set.
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 *  @param[in] order The packet order value.
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 *  @param[in] metric The metric value of the packet.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is invalid..
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 */
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int pq_set_order( packet_t packet, size_t order, size_t metric );
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/** Sets the packet order and metric attributes.
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 *  @param[in] packet The packet to be set.
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 *  @param[out] order The packet order value.
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 *  @param[out] metric The metric value of the packet.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the packet is invalid..
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 */
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int pq_get_order( packet_t packet, size_t * order, size_t * metric );
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/** Releases the whole queue.
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 *  Detaches all packets of the queue and calls the packet_release() for each of them.
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 *  @param[in] first The first packet of the queue.
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 *  @param[in] packet_release The releasing function called for each of the packets after its detachment.
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 */
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void    pq_destroy( packet_t first, void ( * packet_release )( packet_t packet ));
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/** Returns the next packet in the queue.
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 *  @param[in] packet The packet queue member.
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 *  @returns The next packet in the queue.
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 *  @returns NULL if there is no next packet.
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 *  @returns NULL if the packet is not valid.
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 */
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packet_t    pq_next( packet_t packet );
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/** Returns the previous packet in the queue.
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 *  @param[in] packet The packet queue member.
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 *  @returns The previous packet in the queue.
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 *  @returns NULL if there is no previous packet.
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 *  @returns NULL if the packet is not valid.
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 */
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packet_t    pq_previous( packet_t packet );
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/*@}*/
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#endif
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/** @}
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 */