mirror of
https://github.com/h2zero/esp-nimble-cpp.git
synced 2024-11-24 22:20:55 +01:00
447 lines
15 KiB
C++
447 lines
15 KiB
C++
/*
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* NimBLEAttValue.h
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*
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* Created: on March 18, 2021
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* Author H2zero
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*
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*/
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#ifndef MAIN_NIMBLEATTVALUE_H_
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#define MAIN_NIMBLEATTVALUE_H_
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#include "nimconfig.h"
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#if defined(CONFIG_BT_ENABLED)
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#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
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#include <Arduino.h>
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#endif
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#include "NimBLELog.h"
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/**** FIX COMPILATION ****/
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#undef min
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#undef max
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/**************************/
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#include <string>
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#include <vector>
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#ifndef CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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# define CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED 0
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#endif
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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# include <time.h>
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#endif
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#if !defined(CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH)
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# define CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH 20
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#elif CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH > BLE_ATT_ATTR_MAX_LEN
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# error CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH cannot be larger than 512 (BLE_ATT_ATTR_MAX_LEN)
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#elif CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH < 1
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# error CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH cannot be less than 1; Range = 1 : 512
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#endif
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/* Used to determine if the type passed to a template has a c_str() and length() method. */
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template <typename T, typename = void, typename = void>
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struct Has_c_str_len : std::false_type {};
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template <typename T>
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struct Has_c_str_len<T, decltype(void(std::declval<T &>().c_str())),
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decltype(void(std::declval<T &>().length()))> : std::true_type {};
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/**
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* @brief A specialized container class to hold BLE attribute values.
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* @details This class is designed to be more memory efficient than using\n
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* standard container types for value storage, while being convertible to\n
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* many different container classes.
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*/
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class NimBLEAttValue
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{
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uint8_t* m_attr_value = nullptr;
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uint16_t m_attr_max_len = 0;
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uint16_t m_attr_len = 0;
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uint16_t m_capacity = 0;
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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time_t m_timestamp = 0;
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#endif
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void deepCopy(const NimBLEAttValue & source);
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public:
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/**
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* @brief Default constructor.
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* @param[in] init_len The initial size in bytes.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(uint16_t init_len = CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH,
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uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
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/**
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* @brief Construct with an initial value from a buffer.
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* @param value A pointer to the initial value to set.
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* @param[in] len The size in bytes of the value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(const uint8_t *value, uint16_t len,
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uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
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/**
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* @brief Construct with an initializer list.
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* @param list An initializer list containing the initial value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(std::initializer_list<uint8_t> list,
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uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
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:NimBLEAttValue(list.begin(), (uint16_t)list.size(), max_len){}
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/**
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* @brief Construct with an initial value from a const char string.
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* @param value A pointer to the initial value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(const char *value, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
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:NimBLEAttValue((uint8_t*)value, (uint16_t)strlen(value), max_len){}
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/**
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* @brief Construct with an initial value from a std::string.
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* @param str A std::string containing to the initial value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(const std::string str, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
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:NimBLEAttValue((uint8_t*)str.data(), (uint16_t)str.length(), max_len){}
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/**
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* @brief Construct with an initial value from a std::vector<uint8_t>.
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* @param vec A std::vector<uint8_t> containing to the initial value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(const std::vector<uint8_t> vec, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
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:NimBLEAttValue(&vec[0], (uint16_t)vec.size(), max_len){}
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#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
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/**
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* @brief Construct with an initial value from an Arduino String.
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* @param str An Arduino String containing to the initial value to set.
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* @param[in] max_len The max size in bytes that the value can be.
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*/
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NimBLEAttValue(const String str, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
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:NimBLEAttValue((uint8_t*)str.c_str(), str.length(), max_len){}
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#endif
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/** @brief Copy constructor */
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NimBLEAttValue(const NimBLEAttValue & source) { deepCopy(source); }
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/** @brief Move constructor */
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NimBLEAttValue(NimBLEAttValue && source) { *this = std::move(source); }
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/** @brief Destructor */
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~NimBLEAttValue();
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/** @brief Returns the max size in bytes */
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uint16_t max_size() const { return m_attr_max_len; }
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/** @brief Returns the currently allocated capacity in bytes */
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uint16_t capacity() const { return m_capacity; }
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/** @brief Returns the current length of the value in bytes */
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uint16_t length() const { return m_attr_len; }
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/** @brief Returns the current size of the value in bytes */
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uint16_t size() const { return m_attr_len; }
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/** @brief Returns a pointer to the internal buffer of the value */
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const uint8_t* data() const { return m_attr_value; }
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/** @brief Returns a pointer to the internal buffer of the value as a const char* */
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const char* c_str() const { return (const char*)m_attr_value; }
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/** @brief Iterator begin */
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const uint8_t* begin() const { return m_attr_value; }
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/** @brief Iterator end */
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const uint8_t* end() const { return m_attr_value + m_attr_len; }
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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/** @brief Returns a timestamp of when the value was last updated */
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time_t getTimeStamp() const { return m_timestamp; }
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/** @brief Set the timestamp to the current time */
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void setTimeStamp() { m_timestamp = time(nullptr); }
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/**
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* @brief Set the timestamp to the specified time
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* @param[in] t The timestamp value to set
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*/
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void setTimeStamp(time_t t) { m_timestamp = t; }
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#else
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time_t getTimeStamp() const { return 0; }
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void setTimeStamp() { }
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void setTimeStamp(time_t t) { }
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#endif
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/**
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* @brief Set the value from a buffer
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* @param[in] value A ponter to a buffer containing the value.
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* @param[in] len The length of the value in bytes.
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* @returns True if successful.
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*/
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bool setValue(const uint8_t *value, uint16_t len);
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/**
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* @brief Set value to the value of const char*.
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* @param [in] s A ponter to a const char value to set.
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*/
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bool setValue(const char* s) {
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return setValue((uint8_t*)s, (uint16_t)strlen(s)); }
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/**
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* @brief Get a pointer to the value buffer with timestamp.
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* @param[in] timestamp A ponter to a time_t variable to store the timestamp.
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* @returns A pointer to the internal value buffer.
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*/
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const uint8_t* getValue(time_t *timestamp);
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/**
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* @brief Append data to the value.
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* @param[in] value A ponter to a data buffer with the value to append.
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* @param[in] len The length of the value to append in bytes.
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* @returns A reference to the appended NimBLEAttValue.
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*/
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NimBLEAttValue& append(const uint8_t *value, uint16_t len);
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/*********************** Template Functions ************************/
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/**
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* @brief Template to set value to the value of <type\>val.
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* @param [in] s The <type\>value to set.
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* @details Only used for types without a `c_str()` method.
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*/
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template<typename T>
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#ifdef _DOXYGEN_
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bool
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#else
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typename std::enable_if<!Has_c_str_len<T>::value, bool>::type
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#endif
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setValue(const T &s) {
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return setValue((uint8_t*)&s, sizeof(T));
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}
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/**
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* @brief Template to set value to the value of <type\>val.
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* @param [in] s The <type\>value to set.
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* @details Only used if the <type\> has a `c_str()` method.
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*/
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template<typename T>
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#ifdef _DOXYGEN_
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bool
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#else
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typename std::enable_if<Has_c_str_len<T>::value, bool>::type
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#endif
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setValue(const T & s) {
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return setValue((uint8_t*)s.c_str(), (uint16_t)s.length());
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}
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/**
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* @brief Template to return the value as a <type\>.
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* @tparam T The type to convert the data to.
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* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
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* @param [in] skipSizeCheck If true it will skip checking if the data size is less than\n
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* <tt>sizeof(<type\>)</tt>.
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* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is\n
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* less than <tt>sizeof(<type\>)</tt>.
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* @details <b>Use:</b> <tt>getValue<type>(×tamp, skipSizeCheck);</tt>
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*/
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template<typename T>
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T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
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if(!skipSizeCheck && size() < sizeof(T)) {
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return T();
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}
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return *((T *)getValue(timestamp));
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}
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/*********************** Operators ************************/
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/** @brief Subscript operator */
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uint8_t operator [](int pos) const {
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assert(pos < m_attr_len && "out of range"); return m_attr_value[pos]; }
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/** @brief Operator; Get the value as a std::vector<uint8_t>. */
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operator std::vector<uint8_t>() const {
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return std::vector<uint8_t>(m_attr_value, m_attr_value + m_attr_len); }
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/** @brief Operator; Get the value as a std::string. */
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operator std::string() const {
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return std::string((char*)m_attr_value, m_attr_len); }
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/** @brief Operator; Get the value as a const uint8_t*. */
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operator const uint8_t*() const { return m_attr_value; }
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/** @brief Operator; Append another NimBLEAttValue. */
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NimBLEAttValue& operator +=(const NimBLEAttValue & source) {
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return append(source.data(), source.size()); }
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/** @brief Operator; Set the value from a std::string source. */
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NimBLEAttValue& operator =(const std::string & source) {
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setValue((uint8_t*)source.data(), (uint16_t)source.size()); return *this; }
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/** @brief Move assignment operator */
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NimBLEAttValue& operator =(NimBLEAttValue && source);
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/** @brief Copy assignment operator */
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NimBLEAttValue& operator =(const NimBLEAttValue & source);
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/** @brief Equality operator */
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bool operator ==(const NimBLEAttValue & source) {
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return (m_attr_len == source.size()) ?
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memcmp(m_attr_value, source.data(), m_attr_len) == 0 : false; }
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/** @brief Inequality operator */
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bool operator !=(const NimBLEAttValue & source){ return !(*this == source); }
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#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
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/** @brief Operator; Get the value as an Arduino String value. */
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operator String() const { return String((char*)m_attr_value); }
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#endif
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};
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inline NimBLEAttValue::NimBLEAttValue(uint16_t init_len, uint16_t max_len) {
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m_attr_value = (uint8_t*)calloc(init_len + 1, 1);
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assert(m_attr_value && "No Mem");
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m_attr_max_len = std::min(BLE_ATT_ATTR_MAX_LEN, (int)max_len);
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m_attr_len = 0;
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m_capacity = init_len;
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setTimeStamp(0);
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}
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inline NimBLEAttValue::NimBLEAttValue(const uint8_t *value, uint16_t len, uint16_t max_len)
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: NimBLEAttValue(len, max_len) {
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memcpy(m_attr_value, value, len);
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m_attr_value[len] = '\0';
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m_attr_len = len;
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}
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inline NimBLEAttValue::~NimBLEAttValue() {
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if(m_attr_value != nullptr) {
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free(m_attr_value);
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}
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}
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inline NimBLEAttValue& NimBLEAttValue::operator =(NimBLEAttValue && source) {
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if (this != &source){
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free(m_attr_value);
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m_attr_value = source.m_attr_value;
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m_attr_max_len = source.m_attr_max_len;
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m_attr_len = source.m_attr_len;
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m_capacity = source.m_capacity;
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setTimeStamp(source.getTimeStamp());
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source.m_attr_value = nullptr;
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}
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return *this;
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}
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inline NimBLEAttValue& NimBLEAttValue::operator =(const NimBLEAttValue & source) {
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if (this != &source) {
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deepCopy(source);
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}
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return *this;
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}
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inline void NimBLEAttValue::deepCopy(const NimBLEAttValue & source) {
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uint8_t* res = (uint8_t*)realloc( m_attr_value, source.m_capacity + 1);
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assert(res && "deepCopy: realloc failed");
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ble_npl_hw_enter_critical();
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m_attr_value = res;
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m_attr_max_len = source.m_attr_max_len;
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m_attr_len = source.m_attr_len;
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m_capacity = source.m_capacity;
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setTimeStamp(source.getTimeStamp());
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memcpy(m_attr_value, source.m_attr_value, m_attr_len + 1);
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ble_npl_hw_exit_critical(0);
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}
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inline const uint8_t* NimBLEAttValue::getValue(time_t *timestamp) {
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if(timestamp != nullptr) {
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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*timestamp = m_timestamp;
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#else
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*timestamp = 0;
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#endif
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}
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return m_attr_value;
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}
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inline bool NimBLEAttValue::setValue(const uint8_t *value, uint16_t len) {
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if (len > m_attr_max_len) {
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NIMBLE_LOGE("NimBLEAttValue", "value exceeds max, len=%u, max=%u",
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len, m_attr_max_len);
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return false;
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}
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uint8_t *res = m_attr_value;
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if (len > m_capacity) {
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res = (uint8_t*)realloc(m_attr_value, (len + 1));
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m_capacity = len;
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}
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assert(res && "setValue: realloc failed");
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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time_t t = time(nullptr);
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#else
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time_t t = 0;
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#endif
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ble_npl_hw_enter_critical();
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m_attr_value = res;
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memcpy(m_attr_value, value, len);
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m_attr_value[len] = '\0';
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m_attr_len = len;
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setTimeStamp(t);
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ble_npl_hw_exit_critical(0);
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return true;
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}
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inline NimBLEAttValue& NimBLEAttValue::append(const uint8_t *value, uint16_t len) {
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if (len < 1) {
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return *this;
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}
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if ((m_attr_len + len) > m_attr_max_len) {
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NIMBLE_LOGE("NimBLEAttValue", "val > max, len=%u, max=%u",
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len, m_attr_max_len);
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return *this;
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}
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uint8_t* res = m_attr_value;
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uint16_t new_len = m_attr_len + len;
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if (new_len > m_capacity) {
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res = (uint8_t*)realloc(m_attr_value, (new_len + 1));
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m_capacity = new_len;
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}
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assert(res && "append: realloc failed");
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#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
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time_t t = time(nullptr);
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#else
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time_t t = 0;
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#endif
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ble_npl_hw_enter_critical();
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m_attr_value = res;
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memcpy(m_attr_value + m_attr_len, value, len);
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m_attr_len = new_len;
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m_attr_value[m_attr_len] = '\0';
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setTimeStamp(t);
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ble_npl_hw_exit_critical(0);
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return *this;
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}
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#endif /*(CONFIG_BT_ENABLED) */
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#endif /* MAIN_NIMBLEATTVALUE_H_ */
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