osd-contiki/platform/cooja/cfs/cfs-cooja.c

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/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* All rights reserved.
*
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
#include <string.h>
#include "lib/simEnvChange.h"
#include "cfs/cfs.h"
#define FLAG_FILE_CLOSED 0
#define FLAG_FILE_OPEN 1
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struct filestate {
char flag;
int access;
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int fileptr;
int endptr;
};
static struct filestate file;
const struct simInterface cfs_interface;
// COOJA variables
#define CFS_BUF_SIZE 4000 /* Configure CFS size here and in ContikiCFS.java */
char simCFSData[CFS_BUF_SIZE] = { 0 };
int simCFSSize = 0;
char simCFSChanged = 0;
int simCFSRead = 0;
int simCFSWritten = 0;
/*---------------------------------------------------------------------------*/
int
cfs_open(const char *n, int f)
{
if(file.flag == FLAG_FILE_CLOSED) {
file.flag = FLAG_FILE_OPEN;
file.access = f;
file.fileptr = 0;
file.endptr = simCFSSize;
if(f & CFS_WRITE) {
if(f & CFS_APPEND) {
file.fileptr = file.endptr;
} else {
file.endptr = 0;
}
}
return 0;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
void
cfs_close(int f)
{
file.flag = FLAG_FILE_CLOSED;
}
/*---------------------------------------------------------------------------*/
int
cfs_read(int f, void *buf, unsigned int len)
{
if(file.flag == FLAG_FILE_OPEN && file.access & CFS_READ) {
if(file.fileptr + len >= file.endptr) {
len = file.endptr - file.fileptr;
}
memcpy(buf, &simCFSData[file.fileptr], len);
file.fileptr += len;
simCFSChanged = 1;
simCFSRead += len;
return len;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
int
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cfs_write(int f, const void *buf, unsigned int len)
{
if(file.flag == FLAG_FILE_OPEN && file.access & CFS_WRITE) {
if(file.fileptr + len > CFS_BUF_SIZE) {
len = CFS_BUF_SIZE - file.fileptr;
printf("cfs-cooja.c: warning: write truncated\n");
}
memcpy(&simCFSData[file.fileptr], buf, len);
file.fileptr += len;
simCFSChanged = 1;
simCFSWritten += len;
if(file.fileptr > file.endptr) {
file.endptr = file.fileptr;
}
if(file.fileptr > simCFSSize) {
simCFSSize = file.fileptr;
}
return len;
} else {
return -1;
}
}
/*---------------------------------------------------------------------------*/
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cfs_offset_t
cfs_seek(int f, cfs_offset_t o, int w)
{
if(file.flag == FLAG_FILE_OPEN) {
if(w == CFS_SEEK_SET) {
file.fileptr = o;
} else if(w == CFS_SEEK_CUR) {
file.fileptr += o;
} else if(w == CFS_SEEK_END) {
file.fileptr = file.endptr + o;
}
if(file.fileptr >= 0 && file.fileptr <= CFS_BUF_SIZE) {
if(file.fileptr > file.endptr) {
file.endptr = file.fileptr;
}
return file.fileptr;
}
}
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return -1;
}
/*---------------------------------------------------------------------------*/
int
cfs_remove(const char *name)
{
memset(simCFSData, 0, sizeof(simCFSData));
return 0;
}
/*---------------------------------------------------------------------------*/
int
cfs_opendir(struct cfs_dir *p, const char *n)
{
return 0;
}
/*---------------------------------------------------------------------------*/
int
cfs_readdir(struct cfs_dir *p, struct cfs_dirent *e)
{
return 0;
}
/*---------------------------------------------------------------------------*/
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void
cfs_closedir(struct cfs_dir *p)
{
}
/*---------------------------------------------------------------------------*/
static void
doInterfaceActionsBeforeTick(void)
{
}
/*---------------------------------------------------------------------------*/
static void
doInterfaceActionsAfterTick(void)
{
}
/*---------------------------------------------------------------------------*/
SIM_INTERFACE(cfs_interface,
doInterfaceActionsBeforeTick,
doInterfaceActionsAfterTick);
/*---------------------------------------------------------------------------*/