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https://github.com/DarkFlippers/unleashed-firmware
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266 lines
9.1 KiB
C
266 lines
9.1 KiB
C
/**
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* @file nfc_device.h
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* @brief Abstract interface for managing NFC device data.
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*
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* Under the hood, it makes use of the protocol-specific functions that each one of them provides
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* and abstracts it with a protocol-independent API.
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*
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* It does not perform any signal processing, but merely serves as a container with some handy
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* operations such as loading and saving from and to a file.
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*/
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "protocols/nfc_device_base.h"
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#include "protocols/nfc_protocol.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief NfcDevice opaque type definition.
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*/
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typedef struct NfcDevice NfcDevice;
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/**
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* @brief Loading callback function signature.
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*
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* A function with such signature can be set as a callback to indicate
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* the completion (or a failure) of nfc_device_load() and nfc_device_save() functions.
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*
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* This facility is commonly used to control GUI elements, such as progress dialogs.
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*
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* @param[in] context user-defined context that was passed in nfc_device_set_loading_callback().
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* @param[in] state true if the data was loaded successfully, false otherwise.
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*/
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typedef void (*NfcLoadingCallback)(void* context, bool state);
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/**
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* @brief Allocate an NfcDevice instance.
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*
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* A newly created instance does not hold any data and thus is considered invalid. The most common
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* use case would be to set its data by calling nfc_device_set_data() right afterwards.
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*
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* @returns pointer to the allocated instance.
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*/
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NfcDevice* nfc_device_alloc(void);
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/**
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* @brief Delete an NfcDevice instance.
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*
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* @param[in,out] instance pointer to the instance to be deleted.
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*/
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void nfc_device_free(NfcDevice* instance);
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/**
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* @brief Clear an NfcDevice instance.
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*
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* All data contained in the instance will be deleted and the instance itself will become invalid
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* as if it was just allocated.
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*
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* @param[in,out] instance pointer to the instance to be cleared.
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*/
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void nfc_device_clear(NfcDevice* instance);
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/**
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* @brief Reset an NfcDevice instance.
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*
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* The data contained in the instance will be reset according to the protocol-defined procedure.
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* Unlike the nfc_device_clear() function, the instance will remain valid.
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*
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* @param[in,out] instance pointer to the instance to be reset.
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*/
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void nfc_device_reset(NfcDevice* instance);
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/**
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* @brief Get the protocol identifier from an NfcDevice instance.
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*
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* If the instance is invalid, the return value will be NfcProtocolInvalid.
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*
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* @param[in] instance pointer to the instance to be queried.
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* @returns protocol identifier contained in the instance.
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*/
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NfcProtocol nfc_device_get_protocol(const NfcDevice* instance);
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/**
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* @brief Get the protocol-specific data from an NfcDevice instance.
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*
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* The protocol parameter's behaviour is a bit tricky. The function will check
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* whether there is such a protocol somewhere in the protocol hierarchy and return
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* the data exactly from that level.
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*
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* Example: Call nfc_device_get_data() on an instance with Mf DESFire protocol.
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* The protocol hierarchy will look like the following:
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*
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* `Mf DESFire --> ISO14443-4A --> ISO14443-3A`
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*
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* Thus, the following values of the protocol parameter are valid:
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*
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* * NfcProtocolIso14443_3a
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* * NfcProtocolIso14443_4a
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* * NfcProtocolMfDesfire
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*
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* and passing them to the call would result in the respective data being returned.
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*
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* However, supplying a protocol identifier which is not in the hierarchy will
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* result in a crash. This is to improve type safety.
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*
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* @param instance pointer to the instance to be queried
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* @param protocol protocol identifier of the data to be retrieved.
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* @returns pointer to the instance's data.
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*/
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const NfcDeviceData* nfc_device_get_data(const NfcDevice* instance, NfcProtocol protocol);
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/**
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* @brief Get the protocol name by its identifier.
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*
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* This function does not require an instance as its return result depends only
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* the protocol identifier.
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*
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* @param[in] protocol numeric identifier of the protocol in question.
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* @returns pointer to a statically allocated string containing the protocol name.
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*/
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const char* nfc_device_get_protocol_name(NfcProtocol protocol);
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/**
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* @brief Get the name of an NfcDevice instance.
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*
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* The return value may change depending on the instance's internal state and the name_type parameter.
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*
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* @param[in] instance pointer to the instance to be queried.
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* @param[in] name_type type of the name to be displayed.
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* @returns pointer to a statically allocated string containing the device name.
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*/
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const char* nfc_device_get_name(const NfcDevice* instance, NfcDeviceNameType name_type);
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/**
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* @brief Get the unique identifier (UID) of an NfcDevice instance.
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*
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* The UID length is protocol-dependent. Additionally, a particular protocol might support
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* several UID lengths.
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*
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* @param[in] instance pointer to the instance to be queried.
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* @param[out] uid_len pointer to the variable to contain the UID length.
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* @returns pointer to the byte array containing the instance's UID.
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*/
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const uint8_t* nfc_device_get_uid(const NfcDevice* instance, size_t* uid_len);
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/**
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* @brief Set the unique identifier (UID) of an NfcDevice instance.
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*
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* The UID length must be supported by the instance's protocol.
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*
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* @param[in,out] instance pointer to the instance to be modified.
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* @param[in] uid pointer to the byte array containing the new UID.
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* @param[in] uid_len length of the UID.
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* @return true if the UID was valid and set, false otherwise.
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*/
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bool nfc_device_set_uid(NfcDevice* instance, const uint8_t* uid, size_t uid_len);
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/**
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* @brief Set the data and protocol of an NfcDevice instance.
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*
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* Any data previously contained in the instance will be deleted.
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*
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* @param[in,out] instance pointer to the instance to be modified.
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* @param[in] protocol numeric identifier of the data's protocol.
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* @param[in] protocol_data pointer to the protocol-specific data.
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*/
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void nfc_device_set_data(
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NfcDevice* instance,
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NfcProtocol protocol,
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const NfcDeviceData* protocol_data);
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/**
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* @brief Copy (export) the data contained in an NfcDevice instance to an outside NfcDeviceData instance.
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*
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* This function does the inverse of nfc_device_set_data().
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* The protocol identifier passed as the protocol parameter MUST match the one
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* stored in the instance, otherwise a crash will occur.
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* This is to improve type safety.
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*
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* @param[in] instance pointer to the instance to be copied from.
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* @param[in] protocol numeric identifier of the instance's protocol.
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* @param[out] protocol_data pointer to the destination data.
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*/
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void nfc_device_copy_data(
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const NfcDevice* instance,
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NfcProtocol protocol,
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NfcDeviceData* protocol_data);
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/**
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* @brief Check whether an NfcDevice instance holds certain data.
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*
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* This function's behaviour is similar to nfc_device_is_equal(), with the difference
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* that it takes NfcProtocol and NfcDeviceData* instead of the second NfcDevice*.
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*
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* The following code snippets [1] and [2] are equivalent:
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*
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* [1]
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* ```c
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* bool is_equal = nfc_device_is_equal(device1, device2);
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* ```
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* [2]
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* ```c
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* NfcProtocol protocol = nfc_device_get_protocol(device2);
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* const NfcDeviceData* data = nfc_device_get_data(device2, protocol);
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* bool is_equal = nfc_device_is_equal_data(device1, protocol, data);
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* ```
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*
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* @param[in] instance pointer to the instance to be compared.
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* @param[in] protocol protocol identifier of the data to be compared.
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* @param[in] protocol_data pointer to the NFC device data to be compared.
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* @returns true if the instance is of the right type and the data matches, false otherwise.
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*/
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bool nfc_device_is_equal_data(
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const NfcDevice* instance,
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NfcProtocol protocol,
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const NfcDeviceData* protocol_data);
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/**
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* @brief Compare two NfcDevice instances to determine whether they are equal.
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*
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* @param[in] instance pointer to the first instance to be compared.
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* @param[in] other pointer to the second instance to be compared.
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* @returns true if both instances are considered equal, false otherwise.
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*/
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bool nfc_device_is_equal(const NfcDevice* instance, const NfcDevice* other);
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/**
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* @brief Set the loading callback function.
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*
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* @param[in,out] instance pointer to the instance to be modified.
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* @param[in] callback pointer to a function to be called when the load operation completes.
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* @param[in] context pointer to a user-specific context (will be passed to the callback).
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*/
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void nfc_device_set_loading_callback(
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NfcDevice* instance,
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NfcLoadingCallback callback,
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void* context);
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/**
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* @brief Save NFC device data form an NfcDevice instance to a file.
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*
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* @param[in] instance pointer to the instance to be saved.
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* @param[in] path pointer to a character string with a full file path.
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* @returns true if the data was successfully saved, false otherwise.
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*/
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bool nfc_device_save(NfcDevice* instance, const char* path);
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/**
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* @brief Load NFC device data to an NfcDevice instance from a file.
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*
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* @param[in,out] instance pointer to the instance to be loaded into.
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* @param[in] path pointer to a character string with a full file path.
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* @returns true if the data was successfully loaded, false otherwise.
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*/
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bool nfc_device_load(NfcDevice* instance, const char* path);
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#ifdef __cplusplus
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}
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#endif
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