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3901 mejdrech 1 
/*
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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 client implementation.
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 */
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#include <errno.h>
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#include <mem.h>
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#include <unistd.h>
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//#include <stdio.h>
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#include <sys/mman.h>
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#include "../../messages.h"
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#include "packet.h"
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#include "packet_header.h"
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#include "packet_client.h"
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int packet_copy_data( packet_t packet, const void * data, size_t length ){
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    if( ! packet_is_valid( packet )) return EINVAL;
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    if( packet->data_start + length >= packet->length ) return ENOMEM;
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    memcpy(( void * ) packet + packet->data_start, data, length );
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    if( packet->data_start + length > packet->data_end ){
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        packet->data_end = packet->data_start + length;
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    }
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    return EOK;
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}
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void * packet_prefix( packet_t packet, size_t length ){
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    if(( ! packet_is_valid( packet )) || ( packet->data_start - sizeof( struct packet ) - 2 * ( packet->dest_addr - packet->src_addr ) < length )) return NULL;
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    packet->data_start -= length;
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    return ( void * ) packet + packet->data_start;
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}
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void * packet_suffix( packet_t packet, size_t length ){
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    if(( ! packet_is_valid( packet )) || ( packet->data_end + length >= packet->length )) return NULL;
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    packet->data_end += length;
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    return ( void * ) packet + packet->data_end - length;
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}
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int packet_trim( packet_t packet, size_t prefix, size_t suffix ){
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    if( ! packet_is_valid( packet )) return EINVAL;
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    if( prefix + suffix > packet->data_end - packet->data_start ) return ENOMEM;
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    packet->data_start += prefix;
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    packet->data_end -= suffix;
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    return EOK;
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}
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packet_id_t packet_get_id( const packet_t packet ){
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    return packet_is_valid( packet ) ? packet->packet_id : 0;
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}
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int packet_get_addr( const packet_t packet, uint8_t ** src, uint8_t ** dest ){
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    if( ! packet_is_valid( packet )) return EINVAL;
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    if( ! packet->addr_len ) return 0;
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    if( src ) * src = ( void * ) packet + packet->src_addr;
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    if( dest ) * dest = ( void * ) packet + packet->dest_addr;
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    return packet->addr_len;
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}
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size_t packet_get_data_length( const packet_t packet ){
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    if( ! packet_is_valid( packet )) return 0;
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    return packet->data_end - packet->data_start;
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}
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void * packet_get_data( const packet_t packet ){
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    if( ! packet_is_valid( packet )) return NULL;
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    return ( void * ) packet + packet->data_start;
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}
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int packet_set_addr( packet_t packet, const uint8_t * src, const uint8_t * dest, size_t addr_len ){
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    size_t  padding;
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    size_t  allocated;
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    if( ! packet_is_valid( packet )) return EINVAL;
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    allocated = packet->dest_addr - packet->src_addr;
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    if( allocated < addr_len ) return ENOMEM;
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    padding = allocated - addr_len;
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    packet->addr_len = addr_len;
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    if( src ){
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        memcpy(( void * ) packet + packet->src_addr, src, addr_len );
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        if( padding ) bzero(( void * ) packet + packet->src_addr + addr_len, padding );
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    }else{
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        bzero(( void * ) packet + packet->src_addr, allocated );
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    }
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    if( dest ){
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        memcpy(( void * ) packet + packet->dest_addr, dest, addr_len );
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        if( padding ) bzero(( void * ) packet + packet->dest_addr + addr_len, padding );
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    }else{
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        bzero(( void * ) packet + packet->dest_addr, allocated );
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    }
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    return EOK;
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}
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/** @}
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 */