338 lines
8.7 KiB
C
338 lines
8.7 KiB
C
/*
|
|
* 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 TLV
|
|
* \author
|
|
* Joakim Eriksson <joakime@sics.se>
|
|
* Niclas Finne <nfi@sics.se>
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
#include <inttypes.h>
|
|
#include "lwm2m-tlv.h"
|
|
|
|
/* Log configuration */
|
|
#include "coap-log.h"
|
|
#define LOG_MODULE "lwm2m-tlv"
|
|
#define LOG_LEVEL LOG_LEVEL_NONE
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static inline uint8_t
|
|
get_len_type(const lwm2m_tlv_t *tlv)
|
|
{
|
|
if(tlv->length < 8) {
|
|
return 0;
|
|
} else if(tlv->length < 256) {
|
|
return 1;
|
|
} else if(tlv->length < 0x10000) {
|
|
return 2;
|
|
} else {
|
|
return 3;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
size_t
|
|
lwm2m_tlv_read(lwm2m_tlv_t *tlv, const uint8_t *buffer, size_t len)
|
|
{
|
|
uint8_t len_type;
|
|
uint8_t len_pos = 1;
|
|
size_t tlv_len;
|
|
|
|
tlv->type = (buffer[0] >> 6) & 3;
|
|
len_type = (buffer[0] >> 3) & 3;
|
|
len_pos = 1 + (((buffer[0] & (1 << 5)) != 0) ? 2 : 1);
|
|
|
|
tlv->id = buffer[1];
|
|
/* if len_pos is larger than two it means that there is more ID to read */
|
|
if(len_pos > 2) {
|
|
tlv->id = (tlv->id << 8) + buffer[2];
|
|
}
|
|
|
|
if(len_type == 0) {
|
|
tlv_len = buffer[0] & 7;
|
|
} else {
|
|
/* read the length */
|
|
tlv_len = 0;
|
|
while(len_type > 0) {
|
|
tlv_len = tlv_len << 8 | buffer[len_pos++];
|
|
len_type--;
|
|
}
|
|
}
|
|
/* and read out the data??? */
|
|
tlv->length = tlv_len;
|
|
tlv->value = &buffer[len_pos];
|
|
|
|
return len_pos + tlv_len;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
size_t
|
|
lwm2m_tlv_get_size(const lwm2m_tlv_t *tlv)
|
|
{
|
|
size_t size;
|
|
/* first hdr + len size */
|
|
size = 1 + get_len_type(tlv);
|
|
/* id size */
|
|
size += (tlv->id > 255) ? 2 : 1;
|
|
|
|
/* and the length */
|
|
size += tlv->length;
|
|
return size;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* If the tlv->value is NULL - only the header will be generated - useful for
|
|
* large strings or opaque streaming (block transfer)
|
|
*/
|
|
size_t
|
|
lwm2m_tlv_write(const lwm2m_tlv_t *tlv, uint8_t *buffer, size_t buffersize)
|
|
{
|
|
int pos;
|
|
uint8_t len_type;
|
|
|
|
/* len type is the same as number of bytes required for length */
|
|
len_type = get_len_type(tlv);
|
|
pos = 1 + len_type;
|
|
/* ensure that we do not write too much */
|
|
if(tlv->value != NULL && buffersize < tlv->length + pos) {
|
|
LOG_WARN("Could not write the TLV - buffer overflow.\n");
|
|
return 0;
|
|
}
|
|
|
|
if(buffersize < pos + 2) {
|
|
return 0;
|
|
}
|
|
|
|
/* first type byte in TLV header */
|
|
buffer[0] = (tlv->type << 6) |
|
|
(tlv->id > 255 ? (1 << 5) : 0) |
|
|
(len_type << 3) |
|
|
(len_type == 0 ? tlv->length : 0);
|
|
|
|
pos = 1;
|
|
/* The ID */
|
|
if(tlv->id > 255) {
|
|
buffer[pos++] = (tlv->id >> 8) & 0xff;
|
|
}
|
|
buffer[pos++] = tlv->id & 0xff;
|
|
/* Add length if needed - unrolled loop ? */
|
|
if(len_type > 2) {
|
|
buffer[pos++] = (tlv->length >> 16) & 0xff;
|
|
}
|
|
if(len_type > 1) {
|
|
buffer[pos++] = (tlv->length >> 8) & 0xff;
|
|
}
|
|
if(len_type > 0) {
|
|
buffer[pos++] = tlv->length & 0xff;
|
|
}
|
|
|
|
/* finally add the value */
|
|
if(tlv->value != NULL && tlv->length > 0) {
|
|
memcpy(&buffer[pos], tlv->value, tlv->length);
|
|
}
|
|
|
|
if(LOG_DBG_ENABLED) {
|
|
int i;
|
|
LOG_DBG("TLV: ");
|
|
for(i = 0; i < pos + ((tlv->value != NULL) ? tlv->length : 0); i++) {
|
|
LOG_DBG_("%02x", buffer[i]);
|
|
}
|
|
LOG_DBG_("\n");
|
|
}
|
|
|
|
return pos + ((tlv->value != NULL) ? tlv->length : 0);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int32_t
|
|
lwm2m_tlv_get_int32(const lwm2m_tlv_t *tlv)
|
|
{
|
|
int i;
|
|
int32_t value = 0;
|
|
|
|
for(i = 0; i < tlv->length; i++) {
|
|
value = (value << 8) | tlv->value[i];
|
|
}
|
|
|
|
/* Ensure that we set all the bits above what we read in */
|
|
if(tlv->value[0] & 0x80) {
|
|
while(i < 4) {
|
|
value = value | (0xff << (i * 8));
|
|
i++;
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
size_t
|
|
lwm2m_tlv_write_int32(uint8_t type, int16_t id, int32_t value, uint8_t *buffer, size_t len)
|
|
{
|
|
lwm2m_tlv_t tlv;
|
|
uint8_t buf[4];
|
|
int i;
|
|
int v;
|
|
int last_bit;
|
|
LOG_DBG("Exporting int32 %d %"PRId32" ", id, value);
|
|
|
|
v = value < 0 ? -1 : 0;
|
|
i = 0;
|
|
do {
|
|
buf[3 - i] = value & 0xff;
|
|
/* check if the last MSB indicates that we need another byte */
|
|
last_bit = (v == 0 && (value & 0x80) > 0) || (v == -1 && (value & 0x80) == 0);
|
|
value = value >> 8;
|
|
i++;
|
|
} while((value != v || last_bit) && i < 4);
|
|
|
|
/* export INT as TLV */
|
|
LOG_DBG("len: %d\n", i);
|
|
tlv.type = type;
|
|
tlv.length = i;
|
|
tlv.value = &buf[3 - (i - 1)];
|
|
tlv.id = id;
|
|
return lwm2m_tlv_write(&tlv, buffer, len);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* convert fixpoint 32-bit to a IEEE Float in the byte array*/
|
|
size_t
|
|
lwm2m_tlv_write_float32(uint8_t type, int16_t id, int32_t value, int bits,
|
|
uint8_t *buffer, size_t len)
|
|
{
|
|
int i;
|
|
int e = 0;
|
|
int32_t val = 0;
|
|
int32_t v;
|
|
uint8_t b[4];
|
|
lwm2m_tlv_t tlv;
|
|
|
|
v = value;
|
|
if(v < 0) {
|
|
v = -v;
|
|
}
|
|
|
|
while(v > 1) {
|
|
val = (val >> 1);
|
|
if (v & 1) {
|
|
val = val | (1L << 22);
|
|
}
|
|
v = (v >> 1);
|
|
e++;
|
|
}
|
|
|
|
LOG_DBG("Sign: %d, Fraction: %06"PRIx32" 0b", value < 0, val);
|
|
for(i = 0; i < 23; i++) {
|
|
LOG_DBG_("%"PRId32"", ((val >> (22 - i)) & 1));
|
|
}
|
|
LOG_DBG_("\nExp:%d\n", e);
|
|
|
|
/* convert to the thing we should have */
|
|
e = e - bits + 127;
|
|
|
|
if(value == 0) {
|
|
e = 0;
|
|
}
|
|
|
|
/* is this the right byte order? */
|
|
b[0] = (value < 0 ? 0x80 : 0) | (e >> 1);
|
|
b[1] = ((e & 1) << 7) | ((val >> 16) & 0x7f);
|
|
b[2] = (val >> 8) & 0xff;
|
|
b[3] = val & 0xff;
|
|
|
|
LOG_DBG("B=%02x%02x%02x%02x\n", b[0], b[1], b[2], b[3]);
|
|
/* construct the TLV */
|
|
tlv.type = type;
|
|
tlv.length = 4;
|
|
tlv.value = b;
|
|
tlv.id = id;
|
|
|
|
return lwm2m_tlv_write(&tlv, buffer, len);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* convert float to fixpoint */
|
|
size_t
|
|
lwm2m_tlv_float32_to_fix(const lwm2m_tlv_t *tlv, int32_t *value, int bits)
|
|
{
|
|
/* TLV needs to be 4 bytes */
|
|
int e, i;
|
|
int32_t val;
|
|
int sign = (tlv->value[0] & 0x80) != 0;
|
|
e = ((tlv->value[0] << 1) & 0xff) | (tlv->value[1] >> 7);
|
|
val = (((long)tlv->value[1] & 0x7f) << 16) | (tlv->value[2] << 8) | tlv->value[3];
|
|
|
|
LOG_DBG("Sign: %d, Fraction: %06"PRIx32" 0b", val < 0, val);
|
|
for(i = 0; i < 23; i++) {
|
|
LOG_DBG_("%"PRId32"", ((val >> (22 - i)) & 1));
|
|
}
|
|
LOG_DBG("\nExp:%d => %d\n", e, e - 127);
|
|
|
|
e = e - 127 + bits;
|
|
|
|
/* e corresponds to the number of times we need to roll the number */
|
|
|
|
LOG_DBG("Actual e=%d\n", e);
|
|
e = e - 23;
|
|
LOG_DBG("E after sub %d\n", e);
|
|
val = val | 1L << 23;
|
|
if(e > 0) {
|
|
val = val << e;
|
|
} else {
|
|
val = val >> -e;
|
|
}
|
|
|
|
*value = sign ? -val : val;
|
|
return 4;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/** @} */
|
|
|
|
#if 0
|
|
int main(int argc, char *argv[])
|
|
{
|
|
lwm2m_tlv_t tlv;
|
|
uint8_t data[24];
|
|
/* Make -1 */
|
|
tlv.length = 2;
|
|
tlv.value = data;
|
|
data[0] = 0x00;
|
|
data[1] = 0x80,
|
|
|
|
printf("TLV:%d\n", lwm2m_tlv_get_int32(&tlv));
|
|
|
|
printf("Len: %d\n", lwm2m_tlv_write_int32(0, 1, -0x88987f, data, 24));
|
|
}
|
|
#endif
|