104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/*
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* Copyright 2011-2014 hasufell
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*
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* This file is part of a hasufell project.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License only.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file filereader.c
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* Reading of arbitrary files into strings as well as
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* reading specific ones via various parsers.
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* @brief reading of different filetypes
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*/
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#include "err.h"
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#include "filereader.h"
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#include "half_edge.h"
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#include "common.h"
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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/**
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* Read an obj file and return a HE_obj
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* if parsing worked.
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*
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* @param filename file to open
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* @return the HE_obj or NULL for failure
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*/
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HE_obj *read_obj_file(char const * const filename)
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{
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char *string = NULL; /* file content */
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HE_obj *obj = NULL;
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/* read the whole file into string */
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string = read_file(filename);
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if (!filename || !*filename || !string || !*string)
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return NULL;
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obj = parse_obj(string);
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free(string);
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return obj;
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}
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/**
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* Reads a file and returns a newly allocated string.
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*
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* @param filename file to open
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* @return newly allocated string, must be freed by the caller
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*/
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char *read_file(char const * const filename)
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{
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char buf[STD_FILE_BUF],
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*string = NULL;
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int objfile = 0;
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size_t str_size = 0;
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ssize_t n;
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objfile = open(filename, O_RDONLY);
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if (objfile != -1) {
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/* read and copy chunks */
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while ((n = read(objfile, buf, STD_FILE_BUF)) > 0) {
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char *tmp_ptr = NULL;
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str_size += n; /* count total bytes read */
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tmp_ptr = (char*) realloc( /* allocate correct size */
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string, /* pointer to realloc */
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str_size /* total bytes read */
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+ 1); /* space for trailing NULL byte */
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CHECK_PTR_VAL(tmp_ptr);
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string = tmp_ptr;
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/* append buffer to string */
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memcpy(string + (str_size - n), buf, n);
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}
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/* add trailing NULL byte */
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string[str_size] = '\0';
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close(objfile);
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return string;
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} else {
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return NULL;
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}
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}
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