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/*******************************************************************************
* apps/graphics/traveler/src/trv_planefiles.c
* This file contains the logic to manage the world data files
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included files
****************************************************************************/
#include "trv_types.h"
#include "trv_plane.h"
#include <stdio.h>
#include <errno.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
***************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: trv_load_worldplane
*
* Description:
*
* This function loads the world data for one plane
*
***************************************************************************/
static int trv_load_worldplane(FAR FILE *fp, FAR struct trv_rect_head_s *head,
uint8_t nrects)
{
FAR struct trv_rect_list_s *rect;
int ret;
int i;
for (i = 0; i < nrects; i++)
{
/* Allocate space for the next rectangle */
rect = trv_new_plane();
if (!rect)
{
return -ENOMEM;
}
/* Read the next rectangle from the input file */
ret = fread((char*)&rect->d, RESIZEOF_TRVRECTDATA_T, 1, fp);
if (ret != 1)
{
int errcode = errno;
fprintf(stderr, "Error: read of rectangle %d (of %d) failed\n",
i, nrects);
fprintf(stderr, "feof=%d ferror=%d errno=%d\n",
feof(fp), ferror(fp), errcode);
return -errcode;
}
/* Put the new rectangle into the plane list */
trv_add_plane(rect, head);
}
return OK;
}
/****************************************************************************
* Function: trv_load_planes
* Description:
* This function loads the world data from the opened file
***************************************************************************/
static int trv_load_planes(FAR FILE *fp)
{
struct trv_planefile_header_s header;
int ret;
/* Read the plane file header */
ret = fread((char*)&header, SIZEOF_TRVPLANEFILEHEADER_T, 1, fp);
if (ret != 1)
{
int errcode = errno;
fprintf(stderr, "Error: Failed to read of file header\n");
fprintf(stderr, "feof=%d ferror=%d errno=%d\n",
feof(fp), ferror(fp), errcode);
return -errcode;
}
/* Then load each grid, performing run length (rle) decoding */
ret = trv_load_worldplane(fp, &g_xplane, header.nxrects);
if (ret == OK)
{
ret = trv_load_worldplane(fp, &g_yplane, header.nyrects);
}
if (ret == OK)
{
ret = trv_load_worldplane(fp, &g_zplane, header.nzrects);
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: trv_load_planefile
*
* Description:
*
* This function opens the input file and loads the world plane data from it
*
***************************************************************************/
int trv_load_planefile(FAR const char *wldfile)
{
FAR FILE *fp;
int ret;
/* Open the map file which contains the description of the world */
fp = fopen(wldfile, "rb");
if (fp == NULL)
{
int errcode = errno;
fprintf(stderr, "ERROR: Could not open plane file=\"%s\": %d\n",
wldfile, errcode);
return -errcode;
}
/* Load the world data from the file */
ret = trv_load_planes(fp);
/* Close the file */
fclose(fp);
return ret;
}
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