diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/lwm2m/lwm2m_tlv.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/lwm2m/lwm2m_tlv.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/lwm2m/lwm2m_tlv.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/lwm2m/lwm2m_tlv.c new file mode 100644 index 0000000..047cdb7 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/lwm2m/lwm2m_tlv.c @@ -0,0 +1,399 @@ +/** + * Copyright (c) 2015 - 2018, Nordic Semiconductor ASA + * + * 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, except as embedded into a Nordic + * Semiconductor ASA integrated circuit in a product or a software update for + * such product, 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 Nordic Semiconductor ASA nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * 4. This software, with or without modification, must only be used with a + * Nordic Semiconductor ASA integrated circuit. + * + * 5. Any software provided in binary form under this license must not be reverse + * engineered, decompiled, modified and/or disassembled. + * + * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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. + * + */ +#include <stdint.h> +#include <string.h> +#include "lwm2m_tlv.h" +#include "lwm2m_objects.h" +#include "iot_errors.h" +#include "iot_defines.h" + +// Used for encoding +// TODO: Remove this temp_buffer in order to allow to users to use the API at the same time. +// Current implementation might fail if two different interrupt levels are executing +// encode at the same time. The temp_buffer will be overwritten by the last user. +static uint8_t temp_buffer[4]; + + +uint32_t lwm2m_tlv_bytebuffer_to_uint32(uint8_t * p_buffer, uint8_t val_len, uint32_t * p_result) +{ + uint32_t res; + switch (val_len) + { + case 0: + { + res = 0; + break; + } + + case 1: + { + res = p_buffer[0]; + break; + } + + case 2: + { + res = ((uint32_t)p_buffer[0] << 8) | + p_buffer[1]; + break; + } + + case 3: + { + res = ((uint32_t)p_buffer[0] << 16) | + ((uint32_t)p_buffer[1] << 8) | + p_buffer[2]; + break; + } + + case 4: + { + res = ((uint32_t)p_buffer[0] << 24) | + ((uint32_t)p_buffer[1] << 16) | + ((uint32_t)p_buffer[2] << 8) | + p_buffer[3]; + break; + } + + default: + return NRF_ERROR_DATA_SIZE; + } + + *p_result = res; + return NRF_SUCCESS; +} + + +uint32_t lwm2m_tlv_bytebuffer_to_uint16(uint8_t * p_buffer, uint8_t val_len, uint16_t * p_result) +{ + uint16_t res; + switch (val_len) + { + case 0: + { + res = 0; + break; + } + + case 1: + { + res = p_buffer[0]; + break; + } + + case 2: + { + res = ((uint16_t)p_buffer[0] << 8) | p_buffer[1]; + break; + } + + default: + return NRF_ERROR_DATA_SIZE; + } + + *p_result = res; + return NRF_SUCCESS; +} + + +void lwm2m_tlv_uint16_to_bytebuffer(uint8_t * p_buffer, uint8_t * p_len, uint16_t value) +{ + if (value == 0) + { + *p_len = 0; + } + else if (value <= UINT8_MAX) + { + p_buffer[0] = value; + *p_len = 1; + } + else + { + + p_buffer[1] = value; + p_buffer[0] = value >> 8; + *p_len = 2; + } +} + + +void lwm2m_tlv_uint32_to_bytebuffer(uint8_t * p_buffer, uint8_t * p_len, uint32_t value) +{ + if (value == 0) + { + *p_len = 0; + } + else if (value <= UINT8_MAX) + { + p_buffer[0] = value; + *p_len = 1; + } + else if (value <= UINT16_MAX) + { + + p_buffer[1] = value; + p_buffer[0] = value >> 8; + *p_len = 2; + } + else if (value <= 0xFFFFFF) // 24 bit + { + p_buffer[2] = value; + p_buffer[1] = value >> 8; + p_buffer[0] = value >> 16; + *p_len = 3; + } + else + { + p_buffer[3] = value; + p_buffer[2] = value >> 8; + p_buffer[1] = value >> 16; + p_buffer[0] = value >> 24; + *p_len = 4; + } +} + + +void lwm2m_tlv_uint16_set(lwm2m_tlv_t * p_tlv, uint16_t value, uint16_t id) +{ + uint8_t val_len; + lwm2m_tlv_uint16_to_bytebuffer(temp_buffer, &val_len, value); + + p_tlv->length = val_len; + p_tlv->value = temp_buffer; + p_tlv->id = id; +} + + +void lwm2m_tlv_uint32_set(lwm2m_tlv_t * p_tlv, uint32_t value, uint16_t id) +{ + uint8_t val_len; + lwm2m_tlv_uint32_to_bytebuffer(temp_buffer, &val_len, value); + + p_tlv->length = val_len; + p_tlv->value = temp_buffer; + p_tlv->id = id; +} + + +void lwm2m_tlv_bool_set(lwm2m_tlv_t * p_tlv, bool value, uint16_t id) +{ + + if (value == true) + { + temp_buffer[0] = 1; + } + else + { + temp_buffer[0] = 0; + } + + p_tlv->length = 1; + p_tlv->value = temp_buffer; + p_tlv->id = id; +} + + +void lwm2m_tlv_string_set(lwm2m_tlv_t * p_tlv, lwm2m_string_t string, uint16_t id) +{ + p_tlv->length = string.len; + p_tlv->value = (uint8_t *)string.p_val; + p_tlv->id = id; +} + + +void lwm2m_tlv_opaque_set(lwm2m_tlv_t * p_tlv, lwm2m_opaque_t opaque, uint16_t id) +{ + p_tlv->length = opaque.len; + p_tlv->value = opaque.p_val; + p_tlv->id = id; +} + + +uint32_t lwm2m_tlv_decode(lwm2m_tlv_t * p_tlv, + uint32_t * p_index, + uint8_t * p_buffer, + uint16_t buffer_len) +{ + uint32_t err_code; + uint16_t index = *p_index; + + uint8_t type = (p_buffer[index] & TLV_TYPE_MASK) >> TLV_TYPE_BIT_POS; + uint8_t id_len = (p_buffer[index] & TLV_ID_LEN_MASK) >> TLV_ID_LEN_BIT_POS; + uint8_t length_len = (p_buffer[index] & TLV_LEN_TYPE_MASK) >> TLV_LEN_TYPE_BIT_POS; + uint32_t length = (p_buffer[index] & TLV_LEN_VAL_MASK) >> TLV_VAL_LEN_BIT_POS; + + p_tlv->id_type = type; + p_tlv->length = 0; + + // Jump to the byte following the "Type" at index 0. + ++index; + + // Extract the Identifier based on the number of bytes indicated in id_len (bit 5). + // Adding one to the id_len will give the number of bytes used. + uint8_t id_len_size = id_len + 1; + + err_code = lwm2m_tlv_bytebuffer_to_uint16(&p_buffer[index], id_len_size, &p_tlv->id); + + if (err_code != NRF_SUCCESS) + { + return err_code; + } + index += id_len_size; + + + // Extract the value length. + // The length_len tells how many bytes are being used. + if (length_len == TLV_LEN_TYPE_3BIT) + { + p_tlv->length = length; + } + else + { + err_code = lwm2m_tlv_bytebuffer_to_uint32(&p_buffer[index], length_len, &length); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + p_tlv->length = length; + index += length_len; + } + + if (p_tlv->length > buffer_len) + { + return (IOT_LWM2M_ERR_BASE | NRF_ERROR_INVALID_DATA); + } + + p_tlv->value = &p_buffer[index]; + + *p_index = index + p_tlv->length; + + return NRF_SUCCESS; +} + + +uint32_t lwm2m_tlv_encode(uint8_t * p_buffer, uint32_t * buffer_len, lwm2m_tlv_t * p_tlv) +{ + uint8_t length_len; + uint8_t id_len; + + uint8_t id[2] = {0,}; + uint8_t len[3] = {0,}; + uint16_t index = 0; + uint8_t type = 0; + + // Set Identifier type by copying the lwm2m_tlv_t->id_type into bit 7-6. + type = (p_tlv->id_type << TLV_TYPE_BIT_POS); + + // Set length of Identifier in bit 5 in the TLV type byte. + if (p_tlv->id > UINT8_MAX) + { + type |= (TLV_ID_LEN_16BIT << TLV_ID_LEN_BIT_POS); + id[0] = p_tlv->id >> 8; + id[1] = p_tlv->id; + id_len = 2; + } + else + { + type |= (TLV_ID_LEN_8BIT << TLV_ID_LEN_BIT_POS); + id[0] = p_tlv->id; + id_len = 1; + } + + // Set type of Length bit 4-3 in the TLV type byte. + + // If the Length can fit into 3 bits. + if ((p_tlv->length & TLV_LEN_VAL_MASK) == p_tlv->length) + { + type |= (TLV_LEN_TYPE_3BIT << TLV_LEN_TYPE_BIT_POS); + length_len = 0; + + // As Length type field is set to "No Length", set bit 2-0. + type |= (p_tlv->length & TLV_LEN_VAL_MASK); + } + else + { + lwm2m_tlv_uint32_to_bytebuffer(&len[0], &length_len, p_tlv->length); + + // Length can not be larger than 24-bit. + if (length_len > TLV_LEN_TYPE_24BIT) + { + return (IOT_LWM2M_ERR_BASE | NRF_ERROR_INVALID_PARAM); + } + + type |= (length_len << TLV_LEN_TYPE_BIT_POS); + } + + // Check if the buffer is large enough. + if (*buffer_len < (p_tlv->length + id_len + length_len + 1)) // + 1 for the type byte + { + return (IOT_LWM2M_ERR_BASE | NRF_ERROR_DATA_SIZE); + } + + // Copy the type to the buffer. + memcpy(p_buffer + index, &type, 1); + ++index; + + // Copy the Identifier to the buffer. + memcpy(p_buffer + index, id, id_len); + index += id_len; + + // Copy length to the buffer. + if (length_len != 0) + { + memcpy(p_buffer + index, len, length_len); + index += length_len; + } + + // Copy the value to buffer, memcpy of 0 length is undefined behavior so lets avoid it. + if (p_tlv->length > 0) + { + memcpy(p_buffer + index, p_tlv->value, p_tlv->length); + } + + // Set length of the output buffer. + *buffer_len = p_tlv->length + index; + + return NRF_SUCCESS; +} + + + + |