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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 implementation.

 */

#include <async.h>

#include <errno.h>

#include <mem.h>

#include <unistd.h>

//#include <stdio.h>

#include <ipc/ipc.h>

#include <sys/mman.h>

#include "../../err.h"

#include "../../messages.h"

#include "packet.h"

#include "packet_header.h"

#include "packet_client.h"

/** Obtains the packet from the packet server as the shared memory block.

 *  Creates the local packet mapping as well.

 *  @param phone The packet server module phone. Input parameter.

 *  @param packet The packet reference pointer to store the received packet reference. Output parameter.

 *  @param packet_id The packet identifier. Input parameter.

 *  @param size The packet total size in bytes. Input parameter.

 *  @returns EOK on success.

 *  \todo ipc_share_in_start() error?

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

 */

int packet_return( int phone, packet_ref packet, packet_id_t packet_id, size_t size );

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

    if( ! packet_is_valid( packet )) return EINVAL;

    if( packet->data_start + length >= packet->length ) return ENOMEM;

    memcpy(( void * ) packet + packet->data_start, data, length );

    if( packet->data_start + length > packet->data_end ){

        packet->data_end = packet->data_start + length;

    }

    return EOK;

}

void * packet_prefix( packet_t packet, size_t length ){

    if(( ! packet_is_valid( packet )) || ( packet->data_start - sizeof( struct packet ) - 2 * packet->addr_len < length )) return NULL;

    packet->data_start -= length;

    return ( void * ) packet + packet->data_start;

}

void * packet_suffix( packet_t packet, size_t length ){

    if(( ! packet_is_valid( packet )) || ( packet->data_end + length >= packet->length )) return NULL;

    packet->data_end += length;

    return ( void * ) packet + packet->data_end - length;

}

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

    if( ! packet_is_valid( packet )) return EINVAL;

    if( prefix + suffix > packet->data_end - packet->data_start ) return ENOMEM;

    packet->data_start += prefix;

    packet->data_end -= suffix;

    return EOK;

}

packet_id_t packet_get_id( const packet_t packet ){

    return packet_is_valid( packet ) ? packet->packet_id : 0;

}

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

    if( !( packet_is_valid( packet ) && src && dest )) return EINVAL;

    if( ! packet->addr_len ) return 0;

    * src = ( void * ) packet + packet->src_addr;

    * dest = ( void * ) packet + packet->dest_addr;

    return packet->addr_len;

}

size_t packet_get_data_length( const packet_t packet ){

    if( ! packet_is_valid( packet )) return 0;

    return packet->data_end - packet->data_start;

}

void * packet_get_data( const packet_t packet ){

    if( ! packet_is_valid( packet )) return NULL;

    return ( void * ) packet + packet->data_start;

}

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

    size_t  padding;

    if( ! packet_is_valid( packet )) return EINVAL;

    if( packet->addr_len >= addr_len ) return ENOMEM;

    padding = packet->addr_len - addr_len;

    if( src ){

        memcpy(( void * ) packet + packet->src_addr, src, addr_len );

        bzero(( void * ) packet + packet->src_addr + addr_len, padding );

    }else{

        bzero(( void * ) packet + packet->src_addr + addr_len, packet->addr_len );

    }

    if( dest ){

        memcpy(( void * ) packet + packet->dest_addr, dest, addr_len );

        bzero(( void * ) packet + packet->dest_addr + addr_len, padding );

    }else{

        bzero(( void * ) packet + packet->dest_addr + addr_len, packet->addr_len );

    }

    return EOK;

}

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

    ERROR_DECLARE;

    unsigned int        size;

    if( ! packet ) return EINVAL;

    * packet = pm_find( packet_id );

    if( * packet ) return EOK;

    ERROR_PROPAGATE( async_req_1_1( phone, NET_PACKET_GET_SIZE, packet_id, & size ));

    return packet_return( phone, packet, packet_id, size );

}

int packet_return( int phone, packet_ref packet, packet_id_t packet_id, size_t size ){

    ERROR_DECLARE;

    aid_t       message;

    ipc_call_t  answer;

    ipcarg_t    result;

    message = async_send_1( phone, NET_PACKET_GET, packet_id, & answer );

    * packet = ( packet_t ) as_get_mappable_page( size );

    if( ERROR_OCCURRED( ipc_share_in_start_0_0( phone, * packet, size ))

    || ERROR_OCCURRED( pm_add( * packet ))){

        munmap( * packet, size );

        async_wait_for( message, NULL );

        return ERROR_CODE;

    }

    async_wait_for( message, & result );

    return result;

}

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

    ERROR_DECLARE;

    packet_id_t packet_id;

    unsigned int size;

    packet_t packet;

    if( ERROR_OCCURRED( async_req_4_2( phone, NET_PACKET_CREATE_4, max_content, addr_len, max_prefix, max_suffix, & packet_id, & size ))

    || ERROR_OCCURRED( packet_return( phone, & packet, packet_id, size ))){

        return NULL;

    }

    return packet;

}

packet_t packet_get_1( int phone, size_t content ){

    ERROR_DECLARE;

    packet_id_t packet_id;

    unsigned int    size;

    packet_t    packet;

    if( ERROR_OCCURRED( async_req_1_2( phone, NET_PACKET_CREATE_1, content, & packet_id, & size ))

    || ERROR_OCCURRED( packet_return( phone, & packet, packet_id, size ))){

        return NULL;

    }

    return packet;

}

void pq_release( int phone, packet_id_t packet_id ){

    async_msg_1( phone, NET_PACKET_RELEASE, packet_id );

}

/** @}

 */