[FL-2809] Rework BLE key storage (#2154)

* bt: disconnect first on profile change
* bt keys: rework bt keys
* saved struct: add payload size getter to API
* bt: rework bt with new key storage API
* bt: add keys storage operation to bt API
* hid: save bt keys on sd card
* bt: add unit tests for key storage
* bt: working profile switch
* bt: cleanup
* bt hid: change keys storage path

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

applications/services/bt/bt_service/bt_keys_storage.c

@@ -1,49 +1,24 @@
 #include "bt_keys_storage.h"
 
 #include <furi.h>
+#include <furi_hal_bt.h>
 #include <lib/toolbox/saved_struct.h>
 #include <storage/storage.h>
 
-#define BT_KEYS_STORAGE_PATH INT_PATH(BT_KEYS_STORAGE_FILE_NAME)
 #define BT_KEYS_STORAGE_VERSION (0)
 #define BT_KEYS_STORAGE_MAGIC (0x18)
 
-bool bt_keys_storage_load(Bt* bt) {
-    furi_assert(bt);
-    bool file_loaded = false;
+#define TAG "BtKeyStorage"
 
-    furi_hal_bt_get_key_storage_buff(&bt->bt_keys_addr_start, &bt->bt_keys_size);
-    furi_hal_bt_nvm_sram_sem_acquire();
-    file_loaded = saved_struct_load(
-        BT_KEYS_STORAGE_PATH,
-        bt->bt_keys_addr_start,
-        bt->bt_keys_size,
-        BT_KEYS_STORAGE_MAGIC,
-        BT_KEYS_STORAGE_VERSION);
-    furi_hal_bt_nvm_sram_sem_release();
+struct BtKeysStorage {
+    uint8_t* nvm_sram_buff;
+    uint16_t nvm_sram_buff_size;
+    FuriString* file_path;
+};
 
-    return file_loaded;
-}
+bool bt_keys_storage_delete(BtKeysStorage* instance) {
+    furi_assert(instance);
 
-bool bt_keys_storage_save(Bt* bt) {
-    furi_assert(bt);
-    furi_assert(bt->bt_keys_addr_start);
-    bool file_saved = false;
-
-    furi_hal_bt_nvm_sram_sem_acquire();
-    file_saved = saved_struct_save(
-        BT_KEYS_STORAGE_PATH,
-        bt->bt_keys_addr_start,
-        bt->bt_keys_size,
-        BT_KEYS_STORAGE_MAGIC,
-        BT_KEYS_STORAGE_VERSION);
-    furi_hal_bt_nvm_sram_sem_release();
-
-    return file_saved;
-}
-
-bool bt_keys_storage_delete(Bt* bt) {
-    furi_assert(bt);
     bool delete_succeed = false;
     bool bt_is_active = furi_hal_bt_is_active();
 
@@ -55,3 +30,117 @@ bool bt_keys_storage_delete(Bt* bt) {
 
     return delete_succeed;
 }
+
+BtKeysStorage* bt_keys_storage_alloc(const char* keys_storage_path) {
+    furi_assert(keys_storage_path);
+
+    BtKeysStorage* instance = malloc(sizeof(BtKeysStorage));
+    // Set default nvm ram parameters
+    furi_hal_bt_get_key_storage_buff(&instance->nvm_sram_buff, &instance->nvm_sram_buff_size);
+    // Set key storage file
+    instance->file_path = furi_string_alloc();
+    furi_string_set_str(instance->file_path, keys_storage_path);
+
+    return instance;
+}
+
+void bt_keys_storage_free(BtKeysStorage* instance) {
+    furi_assert(instance);
+
+    furi_string_free(instance->file_path);
+    free(instance);
+}
+
+void bt_keys_storage_set_file_path(BtKeysStorage* instance, const char* path) {
+    furi_assert(instance);
+    furi_assert(path);
+
+    furi_string_set_str(instance->file_path, path);
+}
+
+void bt_keys_storage_set_ram_params(BtKeysStorage* instance, uint8_t* buff, uint16_t size) {
+    furi_assert(instance);
+    furi_assert(buff);
+
+    instance->nvm_sram_buff = buff;
+    instance->nvm_sram_buff_size = size;
+}
+
+bool bt_keys_storage_load(BtKeysStorage* instance) {
+    furi_assert(instance);
+
+    bool loaded = false;
+    do {
+        // Get payload size
+        size_t payload_size = 0;
+        if(!saved_struct_get_payload_size(
+               furi_string_get_cstr(instance->file_path),
+               BT_KEYS_STORAGE_MAGIC,
+               BT_KEYS_STORAGE_VERSION,
+               &payload_size)) {
+            FURI_LOG_E(TAG, "Failed to read payload size");
+            break;
+        }
+
+        if(payload_size > instance->nvm_sram_buff_size) {
+            FURI_LOG_E(TAG, "Saved data doesn't fit ram buffer");
+            break;
+        }
+
+        // Load saved data to ram
+        furi_hal_bt_nvm_sram_sem_acquire();
+        bool data_loaded = saved_struct_load(
+            furi_string_get_cstr(instance->file_path),
+            instance->nvm_sram_buff,
+            payload_size,
+            BT_KEYS_STORAGE_MAGIC,
+            BT_KEYS_STORAGE_VERSION);
+        furi_hal_bt_nvm_sram_sem_release();
+        if(!data_loaded) {
+            FURI_LOG_E(TAG, "Failed to load struct");
+            break;
+        }
+
+        loaded = true;
+    } while(false);
+
+    return loaded;
+}
+
+bool bt_keys_storage_update(BtKeysStorage* instance, uint8_t* start_addr, uint32_t size) {
+    furi_assert(instance);
+    furi_assert(start_addr);
+
+    bool updated = false;
+
+    FURI_LOG_I(
+        TAG,
+        "Base address: %p. Start update address: %p. Size changed: %ld",
+        (void*)instance->nvm_sram_buff,
+        start_addr,
+        size);
+
+    do {
+        size_t new_size = start_addr - instance->nvm_sram_buff + size;
+        if(new_size > instance->nvm_sram_buff_size) {
+            FURI_LOG_E(TAG, "NVM RAM buffer overflow");
+            break;
+        }
+
+        furi_hal_bt_nvm_sram_sem_acquire();
+        bool data_updated = saved_struct_save(
+            furi_string_get_cstr(instance->file_path),
+            instance->nvm_sram_buff,
+            new_size,
+            BT_KEYS_STORAGE_MAGIC,
+            BT_KEYS_STORAGE_VERSION);
+        furi_hal_bt_nvm_sram_sem_release();
+        if(!data_updated) {
+            FURI_LOG_E(TAG, "Failed to update key storage");
+            break;
+        }
+        updated = true;
+    } while(false);
+
+    return updated;
+}