Issue 5568 - Improve string handling by splitting read strings into only ASCII and non-ASCII strings

lib/io.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 29 matching lines @@
     });
   });
 };
 
 exports.IO =
 {
   lineBreak: "\n",
 
   readFromFile(fileName, listener)
   {
-    return readFileAsync(fileName).then((result) =>
+    return new Promise((resolve, reject) =>
     {
-      let lines = result.content.split(/[\r\n]+/);
-      for (let line of lines)
-        listener(line);
+      _fileSystem.readFromFile(fileName, listener, (error) => {
+        if (error)
+          return reject(error);
+        resolve();
+      });
     });
   },
 
   writeToFile(fileName, generator)
   {
     let content = Array.from(generator).join(this.lineBreak) + this.lineBreak;
     return writeFileAsync(fileName, content);
   },
 
   copyFile(fromFileName, toFileName)
@@ skipping 33 matching lines @@
     {
       _fileSystem.stat(fileName, (result) =>
       {
         if (result.error)
           return reject(result.error);
         resolve(result);
       });
     });
   }
 };