flipperzero-firmware/applications/nfc/nfc_device.c

140 lines
3.9 KiB
C
Raw Normal View History

#include "nfc_device.h"
#include <file-worker.h>
#include <path.h>
#define NFC_DEVICE_MAX_DATA_LEN 14
static const char* nfc_app_folder = "nfc";
static const char* nfc_app_extension = ".nfc";
void nfc_device_set_name(NfcDevice* dev, const char* name) {
furi_assert(dev);
strlcpy(dev->dev_name, name, NFC_DEV_NAME_MAX_LEN);
}
bool nfc_device_save(NfcDevice* dev, const char* dev_name) {
furi_assert(dev);
FileWorker* file_worker = file_worker_alloc(false);
string_t dev_file_name;
// Create nfc directory if necessary
if(!file_worker_mkdir(file_worker, nfc_app_folder)) {
return false;
};
// First remove nfc device file if it was saved
string_init_printf(dev_file_name, "%s/%s%s", nfc_app_folder, dev_name, nfc_app_extension);
if(!file_worker_remove(file_worker, string_get_cstr(dev_file_name))) {
string_clear(dev_file_name);
return false;
};
// Prepare buffer to write
uint8_t buff[NFC_DEVICE_MAX_DATA_LEN];
buff[0] = dev->data.uid_len;
memcpy(&buff[1], dev->data.uid, dev->data.uid_len);
memcpy(&buff[dev->data.uid_len + 1], dev->data.atqa, 2);
buff[dev->data.uid_len + 3] = dev->data.sak;
// Save nfc device
bool res = file_worker_open(
file_worker, string_get_cstr(dev_file_name), FSAM_WRITE, FSOM_CREATE_ALWAYS);
string_clear(dev_file_name);
if(res) {
// Write UID length
if(!file_worker_write_hex(file_worker, buff, dev->data.uid_len + 4)) {
file_worker_close(file_worker);
return false;
}
}
file_worker_close(file_worker);
file_worker_free(file_worker);
return true;
}
static bool nfc_device_load_data(FileWorker* file_worker, string_t path, NfcDevice* dev) {
// Open key file
if(!file_worker_open(file_worker, string_get_cstr(path), FSAM_READ, FSOM_OPEN_EXISTING)) {
return false;
}
uint8_t buff[NFC_DEVICE_MAX_DATA_LEN] = {};
// Load first byte - UID length
if(!file_worker_read_hex(file_worker, buff, 1)) {
return false;
}
// Read space
uint8_t space = 0;
if(!file_worker_read(file_worker, &space, 1)) {
return false;
}
// Load other data
if(!file_worker_read_hex(file_worker, &buff[1], buff[0] + 3)) {
return false;
}
// Set loaded data
dev->data.uid_len = buff[0];
memcpy(dev->data.uid, &buff[1], dev->data.uid_len);
memcpy(dev->data.atqa, &buff[dev->data.uid_len + 1], 2);
dev->data.sak = buff[dev->data.uid_len + 3];
return true;
}
bool nfc_device_load(NfcDevice* dev, const char* file_path) {
furi_assert(dev);
furi_assert(file_path);
FileWorker* file_worker = file_worker_alloc(false);
// Load device data
string_t path;
string_init_set_str(path, file_path);
bool dev_load = nfc_device_load_data(file_worker, path, dev);
if(dev_load) {
// Set device name
path_extract_filename_no_ext(file_path, path);
nfc_device_set_name(dev, string_get_cstr(path));
}
string_clear(path);
file_worker_close(file_worker);
file_worker_free(file_worker);
return dev_load;
}
bool nfc_file_select(NfcDevice* dev) {
furi_assert(dev);
FileWorker* file_worker = file_worker_alloc(false);
// Input events and views are managed by file_select
bool res = file_worker_file_select(
file_worker,
nfc_app_folder,
nfc_app_extension,
dev->file_name,
sizeof(dev->file_name),
NULL);
if(res) {
string_t dev_str;
// Get key file path
string_init_printf(dev_str, "%s/%s%s", nfc_app_folder, dev->file_name, nfc_app_extension);
res = nfc_device_load_data(file_worker, dev_str, dev);
if(res) {
nfc_device_set_name(dev, dev->file_name);
}
string_clear(dev_str);
}
file_worker_close(file_worker);
file_worker_free(file_worker);
return res;
}