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/*

 * Copyright (c) 2009 Lukas Mejdrech

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup packet

 *  @{

 */

/** @file

 *  Packet client.

 *  The hosting module has to be compiled with both the packet.c and the packet_client.c source files.

 *  To function correctly, initialization of the packet map by the pm_init() function has to happen at the first place.

 *  The module should not send the packet messages to the packet server but use the functions provided.

 *  The packet map should be released by the pm_destroy() function during the module termination.

 *  The packets and the packet queues can't be locked at all.

 *  The processing modules should process them sequentially - by passing the packets to the next module and stopping using the passed ones.

 *  @see packet.h

 */

#ifndef __NET_PACKET_CLIENT_H__

#define __NET_PACKET_CLIENT_H__

#include "packet.h"

/** @name Packet client interface

 */

/*@{*/

/** Allocates the specified type right before the actual packet content and returns its pointer.

 *  The wrapper of the packet_prepend() function.

 *  @param[in] packet The packet to be used.

 *  @param[in] type The type to be allocated at the beginning of the packet content.

 *  @returns The typed pointer to the allocated memory.

 *  @returns NULL if the packet is not valid.

 *  @returns NULL if there is not enough memory left.

 */

#define PACKET_PREFIX( packet, type )   ( type * ) packet_prefix(( packet ), sizeof( type ))

/** Allocates the specified type right after the actual packet content and returns its pointer.

 *  The wrapper of the packet_append() function.

 *  @param[in] packet The packet to be used.

 *  @param[in] type The type to be allocated at the end of the packet content.

 *  @returns The typed pointer to the allocated memory.

 *  @returns NULL if the packet is not valid.

 *  @returns NULL if there is not enough memory left.

 */

#define PACKET_SUFFIX( packet, type )   ( type * ) packet_suffix(( packet ), sizeof( type ))

/** Trims the actual packet content by the specified prefix and suffix types.

 *  The wrapper of the packet_trim() function.

 *  @param[in] packet The packet to be trimmed.

 *  @param[in] prefix The type of the prefix to be removed from the beginning of the packet content.

 *  @param[in] suffix The type of the suffix to be removed from the end of the packet content.

 *  @returns EOK on success.

 *  @returns EINVAL if the packet is not valid.

 *  @returns ENOMEM if there is not enough memory left.

 */

#define PACKET_TRIM( packet, prefix, suffix )   packet_trim(( packet ), sizeof( prefix ), sizeof( suffix ))

/** Allocates the specified space right before the actual packet content and returns its pointer.

 *  @param[in] packet The packet to be used.

 *  @param[in] length The space length to be allocated at the beginning of the packet content.

 *  @returns The pointer to the allocated memory.

 *  @returns NULL if there is not enough memory left.

 */

void *  packet_prefix( packet_t packet, size_t length );

/** Allocates the specified space right after the actual packet content and returns its pointer.

 *  @param[in] packet The packet to be used.

 *  @param[in] length The space length to be allocated at the end of the packet content.

 *  @returns The pointer to the allocated memory.

 *  @returns NULL if there is not enough memory left.

 */

void *  packet_suffix( packet_t packet, size_t length );

/** Trims the actual packet content by the specified prefix and suffix lengths.

 *  @param[in] packet The packet to be trimmed.

 *  @param[in] prefix The prefix length to be removed from the beginning of the packet content.

 *  @param[in] suffix The suffix length to be removed from the end of the packet content.

 *  @returns EOK on success.

 *  @returns EINVAL if the packet is not valid.

 *  @returns ENOMEM if there is not enough memory left.

 */

int packet_trim( packet_t packet, size_t prefix, size_t suffix );

/** Copies the specified data to the beginning of the actual packet content.

 *  Pushes the content end if needed.

 *  @param[in] packet The packet to be filled.

 *  @param[in] data The data to be copied.

 *  @param[in] length The length of the copied data.

 *  @returns EOK on success.

 *  @returns EINVAL if the packet is not valid.

 *  @returns ENOMEM if there is not enough memory left.

 */

int packet_copy_data( packet_t packet, const void * data, size_t length );

/** Returns the packet identifier.

 *  @param[in] packet The packet.

 *  @returns The packet identifier.

 *  @returns Zero (0) if the packet is not valid.

 */

packet_id_t packet_get_id( const packet_t packet );

/** Returns the packet content length.

 *  @param[in] packet The packet.

 *  @returns The packet content length in bytes.

 *  @returns Zero (0) if the packet is not valid.

 */

size_t  packet_get_data_length( const packet_t packet );

/** Returns the pointer to the beginning of the packet content.

 *  @param[in] packet The packet.

 *  @returns The pointer to the beginning of the packet content.

 *  @returns NULL if the packet is not valid.

 */

void *  packet_get_data( const packet_t packet );

/** Returns the stored packet addresses and their length.

 *  @param[in] packet The packet.

 *  @param[out] src The source address. May be NULL if not desired.

 *  @param[out] dest The destination address. May be NULL if not desired.

 *  @returns The stored addresses length.

 *  @returns Zero (0) if the addresses are not present.

 *  @returns EINVAL if the packet is not valid.

 */

int packet_get_addr( const packet_t packet, uint8_t ** src, uint8_t ** dest );

/** Sets the packet addresses.

 *  @param[in] packet The packet.

 *  @param[in] src The new source address. May be NULL.

 *  @param[in] dest The new destination address. May be NULL.

 *  @param[in] addr_len The addresses length.

 *  @returns EOK on success.

 *  @returns EINVAL if the packet is not valid.

 *  @returns ENOMEM if there is not enough memory left.

 */

int packet_set_addr( packet_t packet, const uint8_t * src, const uint8_t * dest, size_t addr_len );

/** Translates the packet identifier to the packet reference.

 *  Tries to find mapping first.

 *  Contacts the packet server to share the packet if the mapping is not present.

 *  @param[in] phone The packet server module phone.

 *  @param[out] packet The packet reference.

 *  @param[in] packet_id The packet identifier.

 *  @returns EOK on success.

 *  @returns EINVAL if the packet parameter is NULL.

 *  @returns Other error codes as defined for the NET_PACKET_GET_SIZE message.

 *  @returns Other error codes as defined for the packet_return() function.

 */

int packet_translate( int phone, packet_ref packet, packet_id_t packet_id );

/** Obtains the packet of the given dimensions.

 *  Contacts the packet server to return the appropriate packet.

 *  @param[in] phone The packet server module phone.

 *  @param[in] addr_len The source and destination addresses maximal length in bytes.

 *  @param[in] max_prefix The maximal prefix length in bytes.

 *  @param[in] max_content The maximal content length in bytes.

 *  @param[in] max_suffix The maximal suffix length in bytes.

 *  @returns The packet reference.

 *  @returns NULL on error.

 */

packet_t packet_get_4( int phone, size_t max_content, size_t addr_len, size_t max_prefix, size_t max_suffix );

/** Obtains the packet of the given content size.

 *  Contacts the packet server to return the appropriate packet.

 *  @param[in] phone The packet server module phone.

 *  @param[in] content The maximal content length in bytes.

 *  @returns The packet reference.

 *  @returns NULL on error.

 */

packet_t packet_get_1( int phone, size_t content );

/** Releases the packet queue.

 *  All packets in the queue are marked as free for use.

 *  The packet queue may be one packet only.

 *  The module should not use the packets after this point until they are received or obtained again.

 *  @param[in] phone The packet server module phone.

 *  @param[in] packet_id The packet identifier.

 */

void pq_release( int phone, packet_id_t packet_id );

/** Returns the packet copy.

 *  Copies the addresses, data, order and metric values.

 *  Does not copy the queue placement.

 *  @param[in] phone The packet server module phone.

 *  @param[in] packet The original packet.

 *  @returns The packet copy.

 *  @returns NULL on error.

 */

packet_t    packet_get_copy( int phone, packet_t packet );

/*@}*/

#endif

/** @}

 */