151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
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* Copyright (C) 2014 FH Bielefeld
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*
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* This file is part of a FH Bielefeld project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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/**
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* @file ntru_file.c
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* Allows operations on files, such as reading
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* and writing.
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* @brief file operations
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*/
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#include "ntru_common.h"
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#include "ntru_err.h"
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#include "ntru_mem.h"
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#include "ntru_string.h"
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.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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#define STD_FILE_BUF 4096
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/*------------------------------------------------------------------------*/
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string *
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read_file(char const * const filename)
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{
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char buf[STD_FILE_BUF],
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*cstring = NULL;
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int fd = 0;
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size_t str_size = 0;
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ssize_t n;
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size_t file_length = 0;
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string *result_string;
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struct stat s;
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if (!filename)
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return NULL;
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fd = open(filename, O_RDONLY);
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/* check if this is a real file */
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if (fstat(fd, &s) == -1)
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return NULL;
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if (!S_ISREG(s.st_mode))
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return NULL;
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file_length = lseek(fd, 0, SEEK_END) + 1;
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lseek(fd, 0, SEEK_SET);
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cstring = malloc(sizeof(char) * file_length);
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if (fd != -1) {
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/* read and copy chunks */
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while ((n = read(fd, buf, STD_FILE_BUF)) != 0) {
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if (n == -1) {
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NTRU_WARN_DEBUG("Failed while reading file descriptor %d",
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fd);
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goto failure_cleanup;
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}
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str_size += n; /* count total bytes read */
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/* append buffer to string */
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memcpy(cstring + (str_size - n), buf, (size_t)n);
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}
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/* add trailing NULL byte */
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cstring[str_size] = '\0';
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if (close(fd)) {
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NTRU_WARN_DEBUG("Failed to close file descripter %d\n", fd);
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goto failure_cleanup;
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}
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result_string = ntru_malloc(sizeof(*result_string));
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result_string->ptr = cstring;
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result_string->len = str_size;
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return result_string;
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} else {
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return NULL;
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}
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failure_cleanup:
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free(cstring);
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return NULL;
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}
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/*------------------------------------------------------------------------*/
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bool
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write_file(string const *wstring, char const * const filename)
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{
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FILE *fp;
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struct stat s;
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if (!wstring || !filename)
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return false;
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/* if "filename" already exists, we need to make sure
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* it's a regular file */
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if (stat(filename, &s) == 0 &&
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!S_ISREG(s.st_mode))
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return false;
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fp = fopen(filename, "w");
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if (!fp) {
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NTRU_WARN_DEBUG("Failed while creating file\n");
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return false;
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}
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for (uint32_t i = 0; i < wstring->len; i++)
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fprintf(fp, "%c", wstring->ptr[i]);
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if (fclose(fp)) {
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NTRU_WARN_DEBUG("Failed to close file descripter\n");
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return false;
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}
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return true;
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}
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/*------------------------------------------------------------------------*/
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