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tlv.c
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tlv.c
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/*******************************************************************************
*
* Copyright (c) 2013, 2014 Intel Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v20.html
* The Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* David Navarro, Intel Corporation - initial API and implementation
* Fabien Fleutot - Please refer to git log
* Bosch Software Innovations GmbH - Please refer to git log
* Scott Bertin, AMETEK, Inc. - Please refer to git log
*
*******************************************************************************/
#include "internals.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <inttypes.h>
#include <float.h>
#ifdef LWM2M_SUPPORT_TLV
#ifndef LWM2M_BIG_ENDIAN
#ifndef LWM2M_LITTLE_ENDIAN
#error Please define LWM2M_BIG_ENDIAN or LWM2M_LITTLE_ENDIAN
#endif
#endif
#define _PRV_TLV_TYPE_MASK 0xC0
#define _PRV_TLV_HEADER_MAX_LENGTH 6
#define _PRV_TLV_TYPE_UNKNOWN (uint8_t)0xFF
#define _PRV_TLV_TYPE_OBJECT (uint8_t)0x10
#define _PRV_TLV_TYPE_OBJECT_INSTANCE (uint8_t)0x00
#define _PRV_TLV_TYPE_RESOURCE (uint8_t)0xC0
#define _PRV_TLV_TYPE_MULTIPLE_RESOURCE (uint8_t)0x80
#define _PRV_TLV_TYPE_RESOURCE_INSTANCE (uint8_t)0x40
static size_t prv_encodeFloat(double data,
uint8_t * data_buffer)
{
size_t length = 0;
if ((data < 0.0 - (double)FLT_MAX) || (data >(double)FLT_MAX))
{
length = 8;
utils_copyValue(data_buffer, &data, 8);
}
else
{
float value;
length = 4;
value = (float)data;
utils_copyValue(data_buffer, &value, 4);
}
return length;
}
static size_t prv_encodeInt(int64_t data,
uint8_t * data_buffer)
{
size_t length = 0;
if (data >= INT8_MIN && data <= INT8_MAX)
{
length = 1;
data_buffer[0] = data;
}
else if (data >= INT16_MIN && data <= INT16_MAX)
{
int16_t value;
value = data;
length = 2;
data_buffer[0] = (value >> 8) & 0xFF;
data_buffer[1] = value & 0xFF;
}
else if (data >= INT32_MIN && data <= INT32_MAX)
{
int32_t value;
value = data;
length = 4;
utils_copyValue(data_buffer, &value, length);
}
else if (data >= INT64_MIN && data <= INT64_MAX)
{
length = 8;
utils_copyValue(data_buffer, &data, length);
}
return length;
}
static size_t prv_encodeUInt(uint64_t data,
uint8_t * data_buffer)
{
size_t length = 0;
if (data <= UINT8_MAX)
{
length = 1;
data_buffer[0] = data;
}
else if (data <= UINT16_MAX)
{
uint16_t value;
value = data;
length = 2;
data_buffer[0] = (value >> 8) & 0xFF;
data_buffer[1] = value & 0xFF;
}
else if (data <= UINT32_MAX)
{
uint32_t value;
value = data;
length = 4;
utils_copyValue(data_buffer, &value, length);
}
else if (data <= UINT64_MAX)
{
length = 8;
utils_copyValue(data_buffer, &data, length);
}
return length;
}
static uint8_t prv_getHeaderType(lwm2m_data_type_t type)
{
switch (type)
{
case LWM2M_TYPE_OBJECT:
return _PRV_TLV_TYPE_OBJECT;
case LWM2M_TYPE_OBJECT_INSTANCE:
return _PRV_TLV_TYPE_OBJECT_INSTANCE;
case LWM2M_TYPE_MULTIPLE_RESOURCE:
return _PRV_TLV_TYPE_MULTIPLE_RESOURCE;
case LWM2M_TYPE_STRING:
case LWM2M_TYPE_INTEGER:
case LWM2M_TYPE_UNSIGNED_INTEGER:
case LWM2M_TYPE_FLOAT:
case LWM2M_TYPE_BOOLEAN:
case LWM2M_TYPE_OPAQUE:
case LWM2M_TYPE_OBJECT_LINK:
case LWM2M_TYPE_CORE_LINK:
return _PRV_TLV_TYPE_RESOURCE;
case LWM2M_TYPE_UNDEFINED:
default:
return _PRV_TLV_TYPE_UNKNOWN;
}
}
static lwm2m_data_type_t prv_getDataType(uint8_t type)
{
switch (type)
{
case _PRV_TLV_TYPE_OBJECT:
return LWM2M_TYPE_OBJECT;
case _PRV_TLV_TYPE_OBJECT_INSTANCE:
return LWM2M_TYPE_OBJECT_INSTANCE;
case _PRV_TLV_TYPE_MULTIPLE_RESOURCE:
return LWM2M_TYPE_MULTIPLE_RESOURCE;
case _PRV_TLV_TYPE_RESOURCE:
case _PRV_TLV_TYPE_RESOURCE_INSTANCE:
return LWM2M_TYPE_OPAQUE;
default:
return LWM2M_TYPE_UNDEFINED;
}
}
static int prv_getHeaderLength(uint16_t id,
size_t dataLen)
{
int length;
length = 2;
if (id > 0xFF)
{
length += 1;
}
if (dataLen > 0xFFFF)
{
length += 3;
}
else if (dataLen > 0xFF)
{
length += 2;
}
else if (dataLen > 7)
{
length += 1;
}
return length;
}
static int prv_createHeader(uint8_t * header,
bool isInstance,
lwm2m_data_type_t type,
uint16_t id,
size_t data_len)
{
int header_len;
int offset;
uint8_t hdrType;
header_len = prv_getHeaderLength(id, data_len);
if (isInstance == true)
{
hdrType = _PRV_TLV_TYPE_RESOURCE_INSTANCE;
}
else
{
hdrType = prv_getHeaderType(type);
}
header[0] = 0;
header[0] |= hdrType&_PRV_TLV_TYPE_MASK;
if (id > 0xFF)
{
header[0] |= 0x20;
header[1] = (id >> 8) & 0XFF;
header[2] = id & 0XFF;
offset = 3;
}
else
{
header[1] = id;
offset = 2;
}
if (data_len <= 7)
{
header[0] += data_len;
}
else if (data_len <= 0xFF)
{
header[0] |= 0x08;
header[offset] = data_len;
}
else if (data_len <= 0xFFFF)
{
header[0] |= 0x10;
header[offset] = (data_len >> 8) & 0XFF;
header[offset + 1] = data_len & 0XFF;
}
else if (data_len <= 0xFFFFFF)
{
header[0] |= 0x18;
header[offset] = (data_len >> 16) & 0XFF;
header[offset + 1] = (data_len >> 8) & 0XFF;
header[offset + 2] = data_len & 0XFF;
}
return header_len;
}
int lwm2m_decode_TLV(const uint8_t * buffer,
size_t buffer_len,
lwm2m_data_type_t * oType,
uint16_t * oID,
size_t * oDataIndex,
size_t * oDataLen)
{
LOG_ARG("buffer_len: %d", buffer_len);
;
if (buffer_len < 2) return 0;
*oDataIndex = 2;
*oType = prv_getDataType(buffer[0]&_PRV_TLV_TYPE_MASK);
if ((buffer[0]&0x20) == 0x20)
{
// id is 16 bits long
if (buffer_len < 3) return 0;
*oDataIndex += 1;
*oID = (buffer[1]<<8) + buffer[2];
}
else
{
// id is 8 bits long
*oID = buffer[1];
}
switch (buffer[0]&0x18)
{
case 0x00:
// no length field
*oDataLen = buffer[0]&0x07;
break;
case 0x08:
// length field is 8 bits long
if (buffer_len < *oDataIndex + 1) return 0;
*oDataLen = buffer[*oDataIndex];
*oDataIndex += 1;
break;
case 0x10:
// length field is 16 bits long
if (buffer_len < *oDataIndex + 2) return 0;
*oDataLen = (buffer[*oDataIndex]<<8) + buffer[*oDataIndex+1];
*oDataIndex += 2;
break;
case 0x18:
// length field is 24 bits long
if (buffer_len < *oDataIndex + 3) return 0;
*oDataLen = (buffer[*oDataIndex]<<16) + (buffer[*oDataIndex+1]<<8) + buffer[*oDataIndex+2];
*oDataIndex += 3;
break;
default:
// can't happen
return 0;
}
if (*oDataIndex + *oDataLen > buffer_len) return 0;
return *oDataIndex + *oDataLen;
}
int tlv_parse(const uint8_t * buffer,
size_t bufferLen,
lwm2m_data_t ** dataP)
{
lwm2m_data_type_t type;
uint16_t id;
size_t dataIndex;
size_t dataLen;
int index = 0;
int result;
int size = 0;
LOG_ARG("bufferLen: %d", bufferLen);
*dataP = NULL;
while (0 != (result = lwm2m_decode_TLV((uint8_t*)buffer + index, bufferLen - index, &type, &id, &dataIndex, &dataLen)))
{
lwm2m_data_t * newTlvP;
newTlvP = lwm2m_data_new(size + 1);
if (size >= 1)
{
if (newTlvP == NULL)
{
lwm2m_data_free(size, *dataP);
return 0;
}
else
{
memcpy(newTlvP, *dataP, size * sizeof(lwm2m_data_t));
lwm2m_free(*dataP);
}
}
*dataP = newTlvP;
(*dataP)[size].type = type;
(*dataP)[size].id = id;
if (type == LWM2M_TYPE_OBJECT_INSTANCE || type == LWM2M_TYPE_MULTIPLE_RESOURCE)
{
(*dataP)[size].value.asChildren.count = tlv_parse(buffer + index + dataIndex,
dataLen,
&((*dataP)[size].value.asChildren.array));
if ((*dataP)[size].value.asChildren.count == 0)
{
lwm2m_data_free(size + 1, *dataP);
return 0;
}
}
else
{
lwm2m_data_encode_opaque(buffer + index + dataIndex, dataLen, (*dataP) + size);
}
size++;
index += result;
}
return size;
}
static int prv_getLength(int size,
lwm2m_data_t * dataP)
{
int length;
int i;
length = 0;
for (i = 0 ; i < size && length != -1 ; i++)
{
lwm2m_data_t * cur = &dataP[i];
switch (cur->type)
{
case LWM2M_TYPE_OBJECT_INSTANCE:
case LWM2M_TYPE_MULTIPLE_RESOURCE:
{
int subLength;
subLength = prv_getLength(cur->value.asChildren.count, cur->value.asChildren.array);
if (subLength == -1)
{
length = -1;
}
else
{
length += prv_getHeaderLength(cur->id, subLength) + subLength;
}
}
break;
case LWM2M_TYPE_STRING:
case LWM2M_TYPE_OPAQUE:
case LWM2M_TYPE_CORE_LINK:
length += prv_getHeaderLength(cur->id, cur->value.asBuffer.length) + cur->value.asBuffer.length;
break;
case LWM2M_TYPE_INTEGER:
{
size_t data_len;
uint8_t unused_buffer[_PRV_64BIT_BUFFER_SIZE];
data_len = prv_encodeInt(cur->value.asInteger, unused_buffer);
length += prv_getHeaderLength(cur->id, data_len) + data_len;
}
break;
case LWM2M_TYPE_UNSIGNED_INTEGER:
{
size_t data_len;
uint8_t unused_buffer[_PRV_64BIT_BUFFER_SIZE];
data_len = prv_encodeUInt(cur->value.asUnsigned, unused_buffer);
length += prv_getHeaderLength(cur->id, data_len) + data_len;
}
break;
case LWM2M_TYPE_FLOAT:
{
size_t data_len;
if ((cur->value.asFloat < 0.0 - (double)FLT_MAX)
|| (cur->value.asFloat >(double)FLT_MAX))
{
data_len = 8;
}
else
{
data_len = 4;
}
length += prv_getHeaderLength(cur->id, data_len) + data_len;
}
break;
case LWM2M_TYPE_BOOLEAN:
// Booleans are always encoded on one byte
length += prv_getHeaderLength(cur->id, 1) + 1;
break;
case LWM2M_TYPE_OBJECT_LINK:
// Object Link are always encoded on four bytes
length += prv_getHeaderLength(cur->id, 4) + 4;
break;
default:
length = -1;
break;
}
}
return length;
}
int tlv_serialize(bool isResourceInstance,
int size,
lwm2m_data_t * dataP,
uint8_t ** bufferP)
{
int length;
int index;
int i;
LOG_ARG("isResourceInstance: %s, size: %d", isResourceInstance?"true":"false", size);
*bufferP = NULL;
length = prv_getLength(size, dataP);
if (length <= 0) return length;
*bufferP = (uint8_t *)lwm2m_malloc(length);
if (*bufferP == NULL) return 0;
index = 0;
for (i = 0 ; i < size && length != 0 ; i++)
{
int headerLen;
bool isInstance;
lwm2m_data_t * cur = &dataP[i];
isInstance = isResourceInstance;
switch (cur->type)
{
case LWM2M_TYPE_MULTIPLE_RESOURCE:
isInstance = true;
// fall through
case LWM2M_TYPE_OBJECT_INSTANCE:
{
uint8_t * tmpBuffer;
int res;
res = tlv_serialize(isInstance, cur->value.asChildren.count, cur->value.asChildren.array, &tmpBuffer);
if (res < 0)
{
length = -1;
}
else
{
size_t tmpLength;
tmpLength = (size_t)res;
headerLen = prv_createHeader(*bufferP + index, false, cur->type, cur->id, tmpLength);
index += headerLen;
if (tmpLength > 0)
{
memcpy(*bufferP + index, tmpBuffer, tmpLength);
index += tmpLength;
lwm2m_free(tmpBuffer);
}
}
}
break;
case LWM2M_TYPE_OBJECT_LINK:
{
int k;
uint8_t buf[4];
uint32_t v = cur->value.asObjLink.objectId;
v <<= 16;
v |= cur->value.asObjLink.objectInstanceId;
for (k = 3; k >= 0; --k) {
buf[k] = (uint8_t)(v & 0xFF);
v >>= 8;
}
// keep encoding as buffer
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, 4);
index += headerLen;
memcpy(*bufferP + index, buf, 4);
index += 4;
}
break;
case LWM2M_TYPE_STRING:
case LWM2M_TYPE_OPAQUE:
case LWM2M_TYPE_CORE_LINK:
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, cur->value.asBuffer.length);
index += headerLen;
if (cur->value.asBuffer.length > 0) {
memcpy(*bufferP + index, cur->value.asBuffer.buffer, cur->value.asBuffer.length);
}
index += cur->value.asBuffer.length;
break;
case LWM2M_TYPE_INTEGER:
{
size_t data_len;
uint8_t data_buffer[_PRV_64BIT_BUFFER_SIZE];
data_len = prv_encodeInt(cur->value.asInteger, data_buffer);
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, data_len);
index += headerLen;
memcpy(*bufferP + index, data_buffer, data_len);
index += data_len;
}
break;
case LWM2M_TYPE_UNSIGNED_INTEGER:
{
size_t data_len;
uint8_t data_buffer[_PRV_64BIT_BUFFER_SIZE];
data_len = prv_encodeUInt(cur->value.asUnsigned, data_buffer);
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, data_len);
index += headerLen;
memcpy(*bufferP + index, data_buffer, data_len);
index += data_len;
}
break;
case LWM2M_TYPE_FLOAT:
{
size_t data_len;
uint8_t data_buffer[_PRV_64BIT_BUFFER_SIZE];
data_len = prv_encodeFloat(cur->value.asFloat, data_buffer);
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, data_len);
index += headerLen;
memcpy(*bufferP + index, data_buffer, data_len);
index += data_len;
}
break;
case LWM2M_TYPE_BOOLEAN:
headerLen = prv_createHeader(*bufferP + index, isInstance, cur->type, cur->id, 1);
index += headerLen;
(*bufferP)[index] = cur->value.asBoolean ? 1 : 0;
index += 1;
break;
default:
length = -1;
break;
}
}
if (length < 0)
{
lwm2m_free(*bufferP);
*bufferP = NULL;
}
LOG_ARG("returning %u", length);
return length;
}
#endif