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Previously, the Cooja mote assumed that its file was always initially empty (file.endptr == 0). Therefore, a file uploaded to a mote's CFS could never be read by the mote, as the mote would prevent reads from going past the EOF (indicated by endptr). By tracking the file size and making it accessible to Cooja, the correct size of the uploaded file can be reported to the mote and allow it to read the uploaded file.
186 lines
5.4 KiB
C
186 lines
5.4 KiB
C
/*
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* Copyright (c) 2006, 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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*/
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#include <string.h>
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#include "lib/simEnvChange.h"
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#include "cfs/cfs.h"
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#define FLAG_FILE_CLOSED 0
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#define FLAG_FILE_OPEN 1
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struct filestate {
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char flag;
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int access;
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int fileptr;
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int endptr;
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};
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static struct filestate file;
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const struct simInterface cfs_interface;
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// COOJA variables
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#define CFS_BUF_SIZE 4000 /* Configure CFS size here and in ContikiCFS.java */
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char simCFSData[CFS_BUF_SIZE] = { 0 };
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int simCFSSize = 0;
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char simCFSChanged = 0;
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int simCFSRead = 0;
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int simCFSWritten = 0;
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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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file.access = f;
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file.fileptr = 0;
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file.endptr = simCFSSize;
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if(f & CFS_WRITE) {
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if(f & CFS_APPEND) {
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file.fileptr = file.endptr;
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} else {
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file.endptr = 0;
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}
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}
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return 0;
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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.flag == FLAG_FILE_OPEN && file.access & CFS_READ) {
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if(file.fileptr + len >= file.endptr) {
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len = file.endptr - file.fileptr;
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}
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memcpy(buf, &simCFSData[file.fileptr], len);
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file.fileptr += len;
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simCFSChanged = 1;
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simCFSRead += 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.flag == FLAG_FILE_OPEN && file.access & CFS_WRITE) {
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if(file.fileptr + len > CFS_BUF_SIZE) {
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len = CFS_BUF_SIZE - file.fileptr;
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printf("cfs-cooja.c: warning: write truncated\n");
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}
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memcpy(&simCFSData[file.fileptr], buf, len);
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file.fileptr += len;
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simCFSChanged = 1;
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simCFSWritten += len;
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if(file.fileptr > file.endptr) {
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file.endptr = file.fileptr;
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}
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if(file.fileptr > simCFSSize) {
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simCFSSize = file.fileptr;
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}
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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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cfs_offset_t
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cfs_seek(int f, cfs_offset_t o, int w)
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{
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if(file.flag == FLAG_FILE_OPEN) {
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if(w == CFS_SEEK_SET) {
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file.fileptr = o;
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} else if(w == CFS_SEEK_CUR) {
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file.fileptr += o;
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} else if(w == CFS_SEEK_END) {
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file.fileptr = file.endptr + o;
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}
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if(file.fileptr >= 0 && file.fileptr <= CFS_BUF_SIZE) {
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if(file.fileptr > file.endptr) {
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file.endptr = file.fileptr;
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}
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return file.fileptr;
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}
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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_remove(const char *name)
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{
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memset(simCFSData, 0, sizeof(simCFSData));
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return 0;
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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 0;
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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 0;
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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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static void
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doInterfaceActionsBeforeTick(void)
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{
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}
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/*---------------------------------------------------------------------------*/
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static void
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doInterfaceActionsAfterTick(void)
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{
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}
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/*---------------------------------------------------------------------------*/
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SIM_INTERFACE(cfs_interface,
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doInterfaceActionsBeforeTick,
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doInterfaceActionsAfterTick);
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/*---------------------------------------------------------------------------*/
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