js add storage module

(without virtual mount api calls)

by Willy-JL

applications/system/js_app/examples/apps/Scripts/js_examples/storage.js

@@ -0,0 +1,43 @@
+let storage = require("storage");
+let path = "/ext/storage.test";
+
+function arraybuf_to_string(arraybuf) {
+    let string = "";
+    let data_view = Uint8Array(arraybuf);
+    for (let i = 0; i < data_view.length; i++) {
+        string += chr(data_view[i]);
+    }
+    return string;
+}
+
+print("File exists:", storage.exists(path));
+
+print("Writing...");
+// write(path, data, offset)
+// If offset is specified, the file is not cleared, content is kept and data is written at specified offset
+// Takes both strings and array buffers
+storage.write(path, "Hello ");
+
+print("File exists:", storage.exists(path));
+
+// Append will create the file even if it doesnt exist!
+// Takes both strings and array buffers
+storage.append(path, "World!");
+
+print("Reading...");
+// read(path, size, offset)
+// If no size specified, total filesize is used
+// If offset is specified, size is capped at (filesize - offset)
+let data = storage.read(path);
+// read returns an array buffer, to allow proper usage of raw binary data
+print(arraybuf_to_string(data));
+
+print("Removing...")
+storage.remove(path);
+
+print("Done")
+
+// There's also:
+// storage.copy(old_path, new_path);
+// storage.move(old_path, new_path);
+// storage.mkdir(path);