Detect save file types by their size

.babelrc

@@ -1,3 +1,3 @@
 {
-	"plugins": ["transform-async-to-generator"]
+	"plugins": ["transform-async-to-generator", "transform-exponentiation-operator"]
 }

client/.babelrc

@@ -2,6 +2,7 @@
 	"presets": ["es2015"],
 	"plugins": [
 		"lodash",
-		"transform-async-to-generator"
+		"transform-async-to-generator",
+		"transform-exponentiation-operator"
 	]
 }

client/add/parseSaveFile.js

@@ -153,10 +153,19 @@ function copy(src, off1, dest, off2, length) {
   }
 }
 
+const FILE_SIZES = {
+  483328: 'ORAS',
+  415232: 'XY',
+  [232 * 30 * 32]: 'YABD',
+  [232 * 30 * 31]: 'PCDATA',
+  458752: 'ORASRAM'
+};
+
 module.exports = saveFile => {
-  for (const fileType of ['ORAS', 'XY', 'YABD', 'PCDATA', 'XYRAM', 'ORASRAM']) {
-    const pk6Files = new SaveReaderDecrypted(saveFile, fileType).getAllPkx();
-    if (pk6Files.length) return pk6Files.map(file => file.data);
+  if (saveFile.length === 2 ** 20 + 156 || saveFile.length === 2 ** 20 + 410) {
+    saveFile = saveFile.subarray(-(2 ** 20));
   }
+  const fileType = FILE_SIZES[saveFile.length];
+  if (fileType) return new SaveReaderDecrypted(saveFile, fileType).getAllPkx().map(pkx => pkx.data);
   return [];
 };

package.json

@@ -17,6 +17,7 @@
     "babel-eslint": "^6.0.2",
     "babel-plugin-lodash": "^3.1.4",
     "babel-plugin-transform-async-to-generator": "^6.7.4",
+    "babel-plugin-transform-exponentiation-operator": "^6.8.0",
     "babel-polyfill": "^6.7.4",
     "babel-preset-es2015": "^6.6.0",
     "babelify": "^7.2.0",