[FL-1499] NFC App: save and load from SD card (#560)

* nfc: add save name and save success scenes
* applications: increase nfc app stack size to 4k
* nfc: move nfc device data to separate file
* nfc: add nfc device save to SD card
* nfc: add file select scene
* nfc: add saved key menu scene
* nfc: add manual SAK, ATQA, UID enter
* nfc: add manual enter
* nfc scenes: remove typedef in SubmenuIndex enu
* nfc_device: close file_worker after load data

Co-authored-by: あく <alleteam@gmail.com>

applications/nfc/nfc_device.c

@@ -0,0 +1,123 @@
+#include "nfc_device.h"
+
+#include <file-worker.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->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* dev_name) {
+    furi_assert(dev);
+
+    return true;
+}
+
+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;
+}