accept file buffers as well as filepath strings

Author: noopkat

lib/tools.js

@@ -8,9 +8,15 @@ var tools = {};
  */
 tools._parseHex = function(file) {
   try {
-    var data = fs.readFileSync(file, {
-      encoding: 'utf8'
-    });
+    var data;
+    if (typeof file === 'string') {
+      data = fs.readFileSync(file, {
+        encoding: 'utf8'
+      });
+    } else {
+      data = file;
+    }
+
     return intelhex.parse(data).data;
   } catch (error) {
     return error;