166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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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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* 1. 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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* 2. 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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: cfs-ram.c,v 1.9 2008/11/24 10:56:55 nvt-se Exp $
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*/
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#include <string.h>
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#include "cfs/cfs.h"
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struct filestate {
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int flag;
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#define FLAG_FILE_CLOSED 0
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#define FLAG_FILE_OPEN 1
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int fileptr;
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int filesize;
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};
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#ifdef CFS_RAM_CONF_SIZE
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#define CFS_RAM_SIZE CFS_RAM_CONF_SIZE
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#else
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#define CFS_RAM_SIZE 4096
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#endif
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static struct filestate file;
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static char filemem[CFS_RAM_SIZE];
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/*---------------------------------------------------------------------------*/
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int
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cfs_open(const char *n, int f)
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{
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if(file.flag == FLAG_FILE_CLOSED) {
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file.flag = FLAG_FILE_OPEN;
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if(f & CFS_READ) {
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file.fileptr = 0;
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}
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if(f & CFS_WRITE){
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if(f & CFS_APPEND) {
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file.fileptr = file.filesize;
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} else {
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file.fileptr = 0;
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file.filesize = 0;
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}
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}
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return 1;
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} else {
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return -1;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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cfs_close(int f)
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{
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file.flag = FLAG_FILE_CLOSED;
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}
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/*---------------------------------------------------------------------------*/
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int
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cfs_read(int f, void *buf, unsigned int len)
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{
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if(file.fileptr + len > sizeof(filemem)) {
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len = sizeof(filemem) - file.fileptr;
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}
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if(file.fileptr + len > file.filesize) {
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len = file.filesize - file.fileptr;
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}
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if(f == 1) {
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memcpy(buf, &filemem[file.fileptr], len);
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file.fileptr += len;
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return len;
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} else {
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return -1;
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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cfs_write(int f, const void *buf, unsigned int len)
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{
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if(file.fileptr >= sizeof(filemem)) {
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return 0;
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}
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if(file.fileptr + len > sizeof(filemem)) {
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len = sizeof(filemem) - file.fileptr;
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}
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if(file.fileptr + len > file.filesize) {
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/* Extend the size of the file. */
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file.filesize = file.fileptr + len;
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}
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if(f == 1) {
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memcpy(&filemem[file.fileptr], buf, len);
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file.fileptr += len;
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return len;
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} else {
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return -1;
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}
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}
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/*---------------------------------------------------------------------------*/
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unsigned int
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cfs_seek(int f, unsigned int o)
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{
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if(f == 1) {
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if(o > file.filesize) {
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o = file.filesize;
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}
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file.fileptr = o;
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return o;
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} else {
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return -1;
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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cfs_remove(const char *name)
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{
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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int
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cfs_opendir(struct cfs_dir *p, const char *n)
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{
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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int
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cfs_readdir(struct cfs_dir *p, struct cfs_dirent *e)
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{
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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void
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cfs_closedir(struct cfs_dir *p)
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{
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}
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/*---------------------------------------------------------------------------*/
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