Add utilities to convert between item and array when working with files

src/core/file/file.h

@@ -12,6 +12,21 @@
 BEGIN_C_LINKAGE
 #endif // !WAPP_PLATFORM_CPP
 
+#ifdef WAPP_PLATFORM_CPP
+#define wapp_file_item_to_array(ITEM) (GenericArray{&(ITEM), 1, 1, sizeof(ITEM)})
+#define wapp_file_array_to_item(TYPE, ARRAY) (sizeof(TYPE) == (ARRAY).item_size && (ARRAY).count == 1 ? \
+                                              *((TYPE *)((ARRAY).items)) :                              \
+                                              TYPE{})
+#else
+#define wapp_file_item_to_array(ITEM) ((GenericArray){.items     = &(ITEM),       \
+                                                      .count     = 1,             \
+                                                      .capacity  = 1,             \
+                                                      .item_size = sizeof(ITEM)})
+#define wapp_file_array_to_item(TYPE, ARRAY) (sizeof(TYPE) == (ARRAY).item_size && (ARRAY).count == 1 ? \
+                                              *((TYPE *)((ARRAY).items)) :                              \
+                                              (TYPE){0})
+#endif // !WAPP_PLATFORM_CPP
+
 typedef FILE File;
 
 typedef enum {