frame_check_sequence.h

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/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2014 John Wellbelove
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of this software and associated documentation files(the "Software"), to deal
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******************************************************************************/
 
#ifndef ETL_FRAME_CHECK_SEQUENCE_INCLUDED
#define ETL_FRAME_CHECK_SEQUENCE_INCLUDED
 
#include "platform.h"
#include "binary.h"
#include "iterator.h"
#include "static_assert.h"
#include "type_traits.h"
 
#include <stdint.h>
 
ETL_STATIC_ASSERT(ETL_USING_8BIT_TYPES, "This file does not currently support targets with no 8bit type");

 
namespace etl
{
  namespace private_frame_check_sequence
  {
    //***************************************************
    //***************************************************
    template <typename TFrame_Check_Sequence>
    class add_insert_iterator : public etl::iterator<ETL_OR_STD::output_iterator_tag, typename TFrame_Check_Sequence::value_type>
    {
    public:
 
      //***********************************
      explicit add_insert_iterator(TFrame_Check_Sequence& fcs) ETL_NOEXCEPT
        : p_fcs(&fcs)
      {
      }
 
      //***********************************
      add_insert_iterator& operator*() ETL_NOEXCEPT
      {
        return *this;
      }
 
      //***********************************
      add_insert_iterator& operator++() ETL_NOEXCEPT
      {
        return *this;
      }
 
      //***********************************
      add_insert_iterator& operator++(int) ETL_NOEXCEPT
      {
        return *this;
      }
 
      //***********************************
      add_insert_iterator& operator=(uint8_t value)
      {
        p_fcs->add(value);
        return *this;
      }
 
    private:
 
      TFrame_Check_Sequence* p_fcs;
    };
  } // namespace private_frame_check_sequence
 
  //***************************************************************************
  //***************************************************************************
  template <typename TPolicy>
  class frame_check_sequence
  {
  public:
 
    typedef TPolicy                                                                            policy_type;
    typedef typename policy_type::value_type                                                   value_type;
    typedef private_frame_check_sequence::add_insert_iterator< frame_check_sequence<TPolicy> > add_insert_iterator;
 
    ETL_STATIC_ASSERT(etl::is_unsigned<value_type>::value, "Signed frame check type not supported");
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 frame_check_sequence()
      : frame_check()
    {
      reset();
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    ETL_CONSTEXPR14 frame_check_sequence(TIterator begin, const TIterator end)
      : frame_check()
    {
      ETL_STATIC_ASSERT(sizeof(typename etl::iterator_traits<TIterator>::value_type) == 1, "Type not supported");
 
      reset();
      add(begin, end);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void reset()
    {
      frame_check = policy.initial();
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename TIterator>
    ETL_CONSTEXPR14 void add(TIterator begin, const TIterator end)
    {
      ETL_STATIC_ASSERT(sizeof(typename etl::iterator_traits<TIterator>::value_type) == 1, "Type not supported");
 
      while (begin != end)
      {
        frame_check = policy.add(frame_check, static_cast<uint8_t>(*begin));
        ++begin;
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 void add(uint8_t value_)
    {
      frame_check = policy.add(frame_check, value_);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 value_type value() const
    {
      return policy.final(frame_check);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 operator value_type() const
    {
      return policy.final(frame_check);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 add_insert_iterator input()
    {
      return add_insert_iterator(*this);
    }
 
  private:
 
    value_type  frame_check;
    policy_type policy;
  };
} // namespace etl
 
#endif