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/*
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 * Copyright (c) 2007 Konopa-Jelen-Majer
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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 FileSystemTask
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 * @{
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 */
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/**
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 * @file    message.c
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 * @brief   Sending extended well formed messages to FS over
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 *        standard HelenOS message agrs and over shared buffer.
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 */
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#include <async.h>
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#include <task.h>
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#include "../fs/fs.h"
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#include "message.h"
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int send_request(int phoneid, ipcarg_t method, message_params_t *params, void *shared_buffer);
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void unpack_message(message_params_t *message, ipc_call_t m_input, void *shared_buffer);
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/**
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 * Forms and sends extended message to FS
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 * This method should be used by all callers of FS. Candidate at library function.
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 */
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int send_request(int phoneid, ipcarg_t method, message_params_t *params, void *shared_buffer)
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{
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    int retval, shift;
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    size_t size;
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    size = sizeof(message_params_t);
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    memset((void *)shared_buffer, 0, size);
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    /* Setting 'buffered' parameters. */
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    memcpy((void* )shared_buffer, (void *)(&params->nbytes), sizeof(unsigned int));
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    shift = sizeof(unsigned int);
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    memcpy((void *)(shared_buffer + shift), (void *)(&params->offset), sizeof(offset_t));
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    shift += sizeof(offset_t);
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    memcpy((void *)(shared_buffer + shift), (void *)(&params->fname), DIRSIZEX);
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    params->fname[DIRSIZEX-1] = '\0';
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    shift += DIRSIZEX * sizeof(char);
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    memcpy((void *)(shared_buffer + shift), (void *)(&params->entry_number), sizeof(int));
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    /* 'Most used' parameters will be pass in standart message parameters. */
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    retval = async_req_3(phoneid, method, task_get_id(), params->fd, params->whence, NULL, NULL, NULL);
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    return retval; 
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}
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/**
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 * Unpacks message to given message_params_t* structure
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 * Will be used by FS to unpacking incoming extended message.
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 */
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void unpack_message(message_params_t *message, ipc_call_t m_input, void *shared_buffer)
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{
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    int shift;
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    /* Core message parameters. */
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    message->id_task = IPC_GET_ARG1(m_input);
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    message->fd = IPC_GET_ARG2(m_input);
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    message->whence = IPC_GET_ARG3(m_input);
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    /* Buffered parameters - extended. */
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    memcpy((void *)&message->nbytes, (void *)(shared_buffer), sizeof(unsigned int));
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    shift = sizeof(unsigned int);
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    memcpy((void *)(&message->offset), (void *)(shared_buffer + shift), sizeof(offset_t));
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    shift += sizeof(offset_t);
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    memcpy((void *)(&message->fname), (void *)(shared_buffer + shift), DIRSIZEX);
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    shift += DIRSIZEX * sizeof(char);
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    memcpy((void *)(&message->entry_number), (void *)(shared_buffer + shift), sizeof(int));
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}
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/**
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 *}
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 */
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