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// -*- C++ -*-
// Copyright (C) 2010-2014, Gabriel Dos Reis.
// All rights reserved.
// Written by Gabriel Dos Reis.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     - Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//
//     - Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in
//       the documentation and/or other materials provided with the
//       distribution.
//
//     - Neither the name of OpenAxiom. nor the names of its contributors
//       may be used to endorse or promote products derived from this
//       software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// --% Author: Gabriel Dos Reis
// --% Description:
// --%   Provide random access read to files through file mapping.

#ifndef OPENAXIOM_FILEMAPPING_included
#define OPENAXIOM_FILEMAPPING_included

#include <open-axiom/storage>

namespace OpenAxiom {
   namespace Memory {
      // -----------------
      // -- FileMapping --
      // -----------------
      struct FileMapping {
         explicit FileMapping(std::string);
         FileMapping(FileMapping&&);
         ~FileMapping();
         const Byte* begin() const { return start; }
         const Byte* end() const { return begin() + extent; }
         std::size_t size() const { return extent; }
      protected:
         Byte* start;           // address at the mapped storage
         size_t extent;         // length (in bytes) of the storage
      private:
         FileMapping(const FileMapping&) = delete;
         FileMapping& operator=(const FileMapping&) = delete;
      };
   }      
}

#endif  // OPENAXIOM_FILEMAPPING_included