Issue 5146 - Part 2: Process http response in C++

compiled/StringScanner.h

 /*
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #pragma once
 
+#include <cwctype>
+
 #include "String.h"
 
 class StringScanner
 {
 private:
   const DependentString mStr;
   String::size_type mPos;
   String::size_type mEnd;
   String::value_type mTerminator;
 public:
@@ skipping 17 matching lines @@
       mPos--;
   }
 
   String::value_type next()
   {
     String::value_type result = done() ? mTerminator : mStr[mPos];
     mPos++;
     return result;
   }
 
+  bool skipWhiteSpace()
+  {
+    bool skipped = false;
+    while (!done() && std::iswspace(mStr[mPos]))
+    {
+      skipped = true;
+      mPos++;
+    }
+
+    return skipped;
+  }
+
+  bool skipString(const String& str)
+  {
+    bool skipped = false;
+
+    if (str.length() > mStr.length() - mPos)
+      return false;
+
+    if (std::memcmp(str.data(),
+                    mStr.data() + mPos,
+                    sizeof(String::value_type) * str.length()) == 0)
+    {
+      mPos += str.length();
+      skipped = true;
+    }
+
+    return skipped;
+  }
+
   bool skipOne(String::value_type ch)
   {
     if (!done() && mStr[mPos] == ch)
     {
       mPos++;
       return true;
     }
 
     return false;
   }
 
   bool skip(String::value_type ch)
   {
     bool skipped = false;
     while ((skipped = skipOne(ch)));
     return skipped;
   }
 };