Issue 5183 - Provide async interface for FileSystem

test/DefaultFileSystem.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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 15 matching lines @@
 
 namespace
 {
   const std::string testPath = "libadblockplus-t\xc3\xa4st-file";
 
   void WriteString(const AdblockPlus::FileSystemPtr& fileSystem,
                    const std::string& content)
   {
     Sync sync;
 
-    fileSystem->Write(testPath, content, [&sync](const std::string& error)
+    fileSystem->Write(testPath,
+      IFileSystem::IOBuffer(content.cbegin(), content.cend()),
+      [&sync](const std::string& error)
       {
         EXPECT_TRUE(error.empty());
 
         sync.Set();
       });
 
     sync.WaitFor();
   }
 }
 
 TEST(DefaultFileSystemTest, WriteReadRemove)
 {
   Sync sync;
   AdblockPlus::FileSystemPtr fileSystem = AdblockPlus::CreateDefaultFileSystem();
   WriteString(fileSystem, "foo");
-  fileSystem->Read(testPath, [fileSystem, &sync](std::string&& content, const std::string& error)
-  {
-    EXPECT_TRUE(error.empty());
-    EXPECT_EQ("foo", content);
+  fileSystem->Read(testPath,
+    [fileSystem, &sync](IFileSystem::IOBuffer&& content, const std::string& error)
+    {
+      EXPECT_TRUE(error.empty());
+      EXPECT_EQ("foo", std::string(content.cbegin(), content.cend()));
 
-    fileSystem->Remove(testPath, [&sync](const std::string& error)
-      {
-        EXPECT_TRUE(error.empty());
-        sync.Set();
-      });
-  });
+      fileSystem->Remove(testPath, [&sync](const std::string& error)
+        {
+          EXPECT_TRUE(error.empty());
+          sync.Set();
+        });
+    });
 
   EXPECT_TRUE(sync.WaitFor());
 }
 
 TEST(DefaultFileSystemTest, StatWorkingDirectory)
 {
   Sync sync;
   AdblockPlus::FileSystemPtr fileSystem = AdblockPlus::CreateDefaultFileSystem();
   fileSystem->Stat(".",
     [fileSystem, &sync](const IFileSystem::StatResult result, const std::string& error)
@@ skipping 45 matching lines @@
                 sync.Set();
               });
             });
           });
         });
       });
     });
 
   EXPECT_TRUE(sync.WaitFor());
 }