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NimBLEAttValue.cpp
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163 lines (142 loc) · 4.93 KB
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/*
* Copyright 2020-2025 Ryan Powell <ryan@nable-embedded.io> and
* esp-nimble-cpp, NimBLE-Arduino contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "NimBLEAttValue.h"
#if CONFIG_BT_NIMBLE_ENABLED
# if defined(CONFIG_NIMBLE_CPP_IDF)
# include "nimble/nimble_npl.h"
# else
# include "nimble/nimble/include/nimble/nimble_npl.h"
# endif
# include "NimBLEUtils.h"
# include "NimBLELog.h"
static const char* LOG_TAG = "NimBLEAttValue";
// Default constructor implementation.
NimBLEAttValue::NimBLEAttValue(uint16_t init_len, uint16_t max_len)
: m_attr_value{static_cast<uint8_t*>(calloc(init_len + 1, 1))},
m_attr_max_len{std::min<uint16_t>(BLE_ATT_ATTR_MAX_LEN, max_len)},
m_attr_len{},
m_capacity{init_len}
# if MYNEWT_VAL(NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED)
,
m_timestamp{}
# endif
{
NIMBLE_CPP_DEBUG_ASSERT(m_attr_value);
if (m_attr_value == nullptr) {
NIMBLE_LOGE(LOG_TAG, "Failed to calloc ctx");
}
}
// Value constructor implementation.
NimBLEAttValue::NimBLEAttValue(const uint8_t* value, uint16_t len, uint16_t max_len) : NimBLEAttValue(len, max_len) {
if (m_attr_value != nullptr) {
memcpy(m_attr_value, value, len);
m_attr_len = len;
}
}
// Destructor implementation.
NimBLEAttValue::~NimBLEAttValue() {
if (m_attr_value != nullptr) {
free(m_attr_value);
}
}
// Move assignment operator implementation.
NimBLEAttValue& NimBLEAttValue::operator=(NimBLEAttValue&& source) {
if (this != &source) {
free(m_attr_value);
m_attr_value = source.m_attr_value;
m_attr_max_len = source.m_attr_max_len;
m_attr_len = source.m_attr_len;
m_capacity = source.m_capacity;
setTimeStamp(source.getTimeStamp());
source.m_attr_value = nullptr;
}
return *this;
}
// Copy assignment implementation.
NimBLEAttValue& NimBLEAttValue::operator=(const NimBLEAttValue& source) {
if (this != &source) {
deepCopy(source);
}
return *this;
}
// Copy all the data from the source object to this object, including allocated space.
void NimBLEAttValue::deepCopy(const NimBLEAttValue& source) {
uint8_t* res = static_cast<uint8_t*>(realloc(m_attr_value, source.m_capacity + 1));
NIMBLE_CPP_DEBUG_ASSERT(res);
if (res == nullptr) {
NIMBLE_LOGE(LOG_TAG, "Failed to realloc deepCopy");
return;
}
ble_npl_hw_enter_critical();
m_attr_value = res;
m_attr_max_len = source.m_attr_max_len;
m_attr_len = source.m_attr_len;
m_capacity = source.m_capacity;
setTimeStamp(source.getTimeStamp());
memcpy(m_attr_value, source.m_attr_value, m_attr_len + 1);
ble_npl_hw_exit_critical(0);
}
// Set the value of the attribute.
bool NimBLEAttValue::setValue(const uint8_t* value, uint16_t len) {
m_attr_len = 0; // Just set the value length to 0 and append instead of repeating code.
m_attr_value[0] = '\0'; // Set the first byte to 0 incase the len of the new value is 0.
append(value, len);
return memcmp(m_attr_value, value, len) == 0 && m_attr_len == len;
}
// Append the new data, allocate as necessary.
NimBLEAttValue& NimBLEAttValue::append(const uint8_t* value, uint16_t len) {
if (len == 0) {
return *this;
}
if ((m_attr_len + len) > m_attr_max_len) {
NIMBLE_LOGE(LOG_TAG, "val > max, len=%u, max=%u", len, m_attr_max_len);
return *this;
}
uint8_t* res = m_attr_value;
uint16_t new_len = m_attr_len + len;
if (new_len > m_capacity) {
res = static_cast<uint8_t*>(realloc(m_attr_value, (new_len + 1)));
m_capacity = new_len;
}
NIMBLE_CPP_DEBUG_ASSERT(res);
if (res == nullptr) {
NIMBLE_LOGE(LOG_TAG, "Failed to realloc append");
return *this;
}
# if MYNEWT_VAL(NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED)
time_t t = time(nullptr);
# else
time_t t = 0;
# endif
ble_npl_hw_enter_critical();
memcpy(res + m_attr_len, value, len);
m_attr_value = res;
m_attr_len = new_len;
m_attr_value[m_attr_len] = '\0';
setTimeStamp(t);
ble_npl_hw_exit_critical(0);
return *this;
}
uint8_t NimBLEAttValue::operator[](int pos) const {
NIMBLE_CPP_DEBUG_ASSERT(pos < m_attr_len);
if (pos >= m_attr_len) {
NIMBLE_LOGE(LOG_TAG, "pos >= len, pos=%u, len=%u", pos, m_attr_len);
return 0;
}
return m_attr_value[pos];
}
#endif // CONFIG_BT_NIMBLE_ENABLED