Embed assets in elf file (#2466)

* FBT: file_assets generator
* Elf file: process manifest section externally
* FBT, file_assets generator: add assets signature
* Storage: assets path alias
* Flipper application: assets unpacker
* Apps, Storage: use '/data' alias for apps data
* Storage: copy file to file
* Assets: log flag, fixes
* Update f18 api
* Assets: asserts
* Assets: fix signature_data check
* App assets: example
* Example assets: fix folder structure in readme
* Assets: fix error handling
* Assets builder: use ansii instead of utf-8, use .fapassets section instead of .fapfiles, add assets path to signature
* Elf file: comment strange places
* Storage: totaly optimized storage_file_copy_to_file

applications/services/storage/storage.h

@@ -10,12 +10,14 @@ extern "C" {
 #define STORAGE_INT_PATH_PREFIX "/int"
 #define STORAGE_EXT_PATH_PREFIX "/ext"
 #define STORAGE_ANY_PATH_PREFIX "/any"
-#define STORAGE_APP_DATA_PATH_PREFIX "/app"
+#define STORAGE_APP_DATA_PATH_PREFIX "/data"
+#define STORAGE_APP_ASSETS_PATH_PREFIX "/assets"
 
 #define INT_PATH(path) STORAGE_INT_PATH_PREFIX "/" path
 #define EXT_PATH(path) STORAGE_EXT_PATH_PREFIX "/" path
 #define ANY_PATH(path) STORAGE_ANY_PATH_PREFIX "/" path
 #define APP_DATA_PATH(path) STORAGE_APP_DATA_PATH_PREFIX "/" path
+#define APP_ASSETS_PATH(path) STORAGE_APP_ASSETS_PATH_PREFIX "/" path
 
 #define RECORD_STORAGE "storage"
 
@@ -146,6 +148,17 @@ bool storage_file_eof(File* file);
  */
 bool storage_file_exists(Storage* storage, const char* path);
 
+/**
+ * @brief Copy data from one opened file to another opened file
+ * Size bytes will be copied from current position of source file to current position of destination file
+ * 
+ * @param source source file
+ * @param destination destination file
+ * @param size size of data to copy
+ * @return bool success flag
+ */
+bool storage_file_copy_to_file(File* source, File* destination, uint32_t size);
+
 /******************* Dir Functions *******************/
 
 /** Opens a directory to get objects from it

applications/services/storage/storage_external_api.c

@@ -9,6 +9,7 @@
 
 #define MAX_NAME_LENGTH 256
 #define MAX_EXT_LEN 16
+#define FILE_BUFFER_SIZE 512
 
 #define TAG "StorageAPI"
 
@@ -251,6 +252,26 @@ bool storage_file_exists(Storage* storage, const char* path) {
     return exist;
 }
 
+bool storage_file_copy_to_file(File* source, File* destination, uint32_t size) {
+    uint8_t* buffer = malloc(FILE_BUFFER_SIZE);
+
+    while(size) {
+        uint32_t read_size = size > FILE_BUFFER_SIZE ? FILE_BUFFER_SIZE : size;
+        if(storage_file_read(source, buffer, read_size) != read_size) {
+            break;
+        }
+
+        if(storage_file_write(destination, buffer, read_size) != read_size) {
+            break;
+        }
+
+        size -= read_size;
+    }
+
+    free(buffer);
+    return size == 0;
+}
+
 /****************** DIR ******************/
 
 static bool storage_dir_open_internal(File* file, const char* path) {

applications/services/storage/storage_i.h

@@ -13,6 +13,7 @@ extern "C" {
 #define STORAGE_COUNT (ST_INT + 1)
 
 #define APPS_DATA_PATH EXT_PATH("apps_data")
+#define APPS_ASSETS_PATH EXT_PATH("apps_assets")
 
 typedef struct {
     ViewPort* view_port;

applications/services/storage/storage_processing.c

@@ -454,7 +454,7 @@ void storage_process_alias(
         FuriString* apps_data_path_with_appsid = furi_string_alloc_set(APPS_DATA_PATH "/");
         furi_string_cat(apps_data_path_with_appsid, furi_thread_get_appid(thread_id));
 
-        // "/app" -> "/ext/apps_data/appsid"
+        // "/data" -> "/ext/apps_data/appsid"
         furi_string_replace_at(
             path,
             0,
@@ -472,6 +472,18 @@ void storage_process_alias(
         }
 
         furi_string_free(apps_data_path_with_appsid);
+    } else if(furi_string_start_with(path, STORAGE_APP_ASSETS_PATH_PREFIX)) {
+        FuriString* apps_assets_path_with_appsid = furi_string_alloc_set(APPS_ASSETS_PATH "/");
+        furi_string_cat(apps_assets_path_with_appsid, furi_thread_get_appid(thread_id));
+
+        // "/assets" -> "/ext/apps_assets/appsid"
+        furi_string_replace_at(
+            path,
+            0,
+            strlen(STORAGE_APP_ASSETS_PATH_PREFIX),
+            furi_string_get_cstr(apps_assets_path_with_appsid));
+
+        furi_string_free(apps_assets_path_with_appsid);
     }
 }