nes-proj/os/services/lwm2m/lwm2m-plain-text.c

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/*
* Copyright (c) 2015-2018, Yanzi Networks AB.
* 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 copyright holder 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 COPYRIGHT HOLDER 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
* COPYRIGHT HOLDER 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.
*/
/**
* \addtogroup lwm2m
* @{
*/
/**
* \file
* Implementation of the Contiki OMA LWM2M plain text reader / writer
* \author
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include "lwm2m-object.h"
#include "lwm2m-plain-text.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "lwm2m-text"
#define LOG_LEVEL LOG_LEVEL_NONE
/*---------------------------------------------------------------------------*/
static size_t
init_write(lwm2m_context_t *ctx)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static size_t
end_write(lwm2m_context_t *ctx)
{
return 0;
}
/*---------------------------------------------------------------------------*/
size_t
lwm2m_plain_text_read_int(const uint8_t *inbuf, size_t len, int32_t *value)
{
int i, neg = 0;
*value = 0;
for(i = 0; i < len; i++) {
if(inbuf[i] >= '0' && inbuf[i] <= '9') {
*value = *value * 10 + (inbuf[i] - '0');
} else if(inbuf[i] == '-' && i == 0) {
neg = 1;
} else {
break;
}
}
if(neg) {
*value = -*value;
}
return i;
}
/*---------------------------------------------------------------------------*/
size_t
lwm2m_plain_text_read_float32fix(const uint8_t *inbuf, size_t len,
int32_t *value, int bits)
{
int i, dot = 0, neg = 0;
int32_t counter, integerpart, frac;
integerpart = 0;
counter = 0;
frac = 0;
for(i = 0; i < len; i++) {
if(inbuf[i] >= '0' && inbuf[i] <= '9') {
counter = counter * 10 + (inbuf[i] - '0');
frac = frac * 10;
} else if(inbuf[i] == '.' && dot == 0) {
integerpart = counter;
counter = 0;
frac = 1;
dot = 1;
} else if(inbuf[i] == '-' && i == 0) {
neg = 1;
} else {
break;
}
}
if(dot == 0) {
integerpart = counter;
counter = 0;
frac = 1;
}
*value = integerpart << bits;
if(frac > 1) {
*value += ((counter << bits) / frac);
}
LOG_DBG("READ FLOATFIX: \"%.*s\" => int(%ld) frac(%ld) f=%ld Value=%ld\n",
(int)len, (char *)inbuf,
(long)integerpart,
(long)counter,
(long)frac,
(long)*value);
if(neg) {
*value = -*value;
}
return i;
}
/*---------------------------------------------------------------------------*/
size_t
lwm2m_plain_text_write_float32fix(uint8_t *outbuf, size_t outlen,
int32_t value, int bits)
{
int64_t v;
unsigned long integer_part;
unsigned long frac_part;
int n, o = 0;
if(outlen == 0) {
return 0;
}
if(value < 0) {
*outbuf++ = '-';
outlen--;
o = 1;
value = -value;
}
integer_part = (unsigned long)(value >> bits);
v = value - (integer_part << bits);
v = (v * 100) >> bits;
frac_part = (unsigned long)v;
n = snprintf((char *)outbuf, outlen, "%lu.%02lu", integer_part, frac_part);
if(n < 0 || n >= outlen) {
return 0;
}
return n + o;
}
/*---------------------------------------------------------------------------*/
static size_t
write_boolean(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int value)
{
if(outlen > 0) {
if(value) {
*outbuf = '1';
} else {
*outbuf = '0';
}
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static size_t
write_int(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int32_t value)
{
int n = snprintf((char *)outbuf, outlen, "%ld", (long)value);
if(n < 0 || n >= outlen) {
return 0;
}
return n;
}
/*---------------------------------------------------------------------------*/
static size_t
write_float32fix(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
int32_t value, int bits)
{
return lwm2m_plain_text_write_float32fix(outbuf, outlen, value, bits);
}
/*---------------------------------------------------------------------------*/
static size_t
write_string(lwm2m_context_t *ctx, uint8_t *outbuf, size_t outlen,
const char *value, size_t stringlen)
{
int totlen = stringlen;
if(stringlen >= outlen) {
return 0;
}
memmove(outbuf, value, totlen);
outbuf[totlen] = 0;
return totlen;
}
/*---------------------------------------------------------------------------*/
const lwm2m_writer_t lwm2m_plain_text_writer = {
init_write,
end_write,
NULL, /* No support for sub resources here! */
NULL,
write_int,
write_string,
write_float32fix,
write_boolean
};
/*---------------------------------------------------------------------------*/
static size_t
read_int(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
int32_t *value)
{
int size = lwm2m_plain_text_read_int(inbuf, len, value);
ctx->last_value_len = size;
return size;
}
/*---------------------------------------------------------------------------*/
static size_t
read_string(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
uint8_t *value, size_t stringlen)
{
if(stringlen <= len) {
/* The outbuffer can not contain the full string including ending zero */
return 0;
}
memcpy(value, inbuf, len);
value[len] = '\0';
ctx->last_value_len = len;
return len;
}
/*---------------------------------------------------------------------------*/
static size_t
read_float32fix(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
int32_t *value, int bits)
{
int size;
size = lwm2m_plain_text_read_float32fix(inbuf, len, value, bits);
ctx->last_value_len = size;
return size;
}
/*---------------------------------------------------------------------------*/
static size_t
read_boolean(lwm2m_context_t *ctx, const uint8_t *inbuf, size_t len,
int *value)
{
if(len > 0) {
if(*inbuf == '1' || *inbuf == '0') {
*value = *inbuf == '1' ? 1 : 0;
ctx->last_value_len = 1;
return 1;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
const lwm2m_reader_t lwm2m_plain_text_reader = {
read_int,
read_string,
read_float32fix,
read_boolean
};
/*---------------------------------------------------------------------------*/
/** @} */