diff options
Diffstat (limited to 'apps/graphics/traveler/src/trv_planefiles.c')
-rw-r--r-- | apps/graphics/traveler/src/trv_planefiles.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/apps/graphics/traveler/src/trv_planefiles.c b/apps/graphics/traveler/src/trv_planefiles.c new file mode 100644 index 000000000..828d6c06d --- /dev/null +++ b/apps/graphics/traveler/src/trv_planefiles.c @@ -0,0 +1,183 @@ +/******************************************************************************* + * 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; +} + |