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diff --git a/lib/asio/buffers_iterator.hpp b/lib/asio/buffers_iterator.hpp
deleted file mode 100644
index f5c9d4c..0000000
--- a/lib/asio/buffers_iterator.hpp
+++ /dev/null
@@ -1,521 +0,0 @@
-//
-// buffers_iterator.hpp
-// ~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_BUFFERS_ITERATOR_HPP
-#define ASIO_BUFFERS_ITERATOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include <iterator>
-#include "asio/buffer.hpp"
-#include "asio/detail/assert.hpp"
-#include "asio/detail/type_traits.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-namespace detail
-{
-  template <bool IsMutable>
-  struct buffers_iterator_types_helper;
-
-  template <>
-  struct buffers_iterator_types_helper<false>
-  {
-    typedef const_buffer buffer_type;
-    template <typename ByteType>
-    struct byte_type
-    {
-      typedef typename add_const<ByteType>::type type;
-    };
-  };
-
-  template <>
-  struct buffers_iterator_types_helper<true>
-  {
-    typedef mutable_buffer buffer_type;
-    template <typename ByteType>
-    struct byte_type
-    {
-      typedef ByteType type;
-    };
-  };
-
-  template <typename BufferSequence, typename ByteType>
-  struct buffers_iterator_types
-  {
-    enum
-    {
-      is_mutable = is_convertible<
-          typename BufferSequence::value_type,
-          mutable_buffer>::value
-    };
-    typedef buffers_iterator_types_helper<is_mutable> helper;
-    typedef typename helper::buffer_type buffer_type;
-    typedef typename helper::template byte_type<ByteType>::type byte_type;
-    typedef typename BufferSequence::const_iterator const_iterator;
-  };
-
-  template <typename ByteType>
-  struct buffers_iterator_types<mutable_buffer, ByteType>
-  {
-    typedef mutable_buffer buffer_type;
-    typedef ByteType byte_type;
-    typedef const mutable_buffer* const_iterator;
-  };
-
-  template <typename ByteType>
-  struct buffers_iterator_types<const_buffer, ByteType>
-  {
-    typedef const_buffer buffer_type;
-    typedef typename add_const<ByteType>::type byte_type;
-    typedef const const_buffer* const_iterator;
-  };
-
-#if !defined(ASIO_NO_DEPRECATED)
-
-  template <typename ByteType>
-  struct buffers_iterator_types<mutable_buffers_1, ByteType>
-  {
-    typedef mutable_buffer buffer_type;
-    typedef ByteType byte_type;
-    typedef const mutable_buffer* const_iterator;
-  };
-
-  template <typename ByteType>
-  struct buffers_iterator_types<const_buffers_1, ByteType>
-  {
-    typedef const_buffer buffer_type;
-    typedef typename add_const<ByteType>::type byte_type;
-    typedef const const_buffer* const_iterator;
-  };
-
-#endif // !defined(ASIO_NO_DEPRECATED)
-}
-
-/// A random access iterator over the bytes in a buffer sequence.
-template <typename BufferSequence, typename ByteType = char>
-class buffers_iterator
-{
-private:
-  typedef typename detail::buffers_iterator_types<
-      BufferSequence, ByteType>::buffer_type buffer_type;
-
-  typedef typename detail::buffers_iterator_types<BufferSequence,
-          ByteType>::const_iterator buffer_sequence_iterator_type;
-
-public:
-  /// The type used for the distance between two iterators.
-  typedef std::ptrdiff_t difference_type;
-
-  /// The type of the value pointed to by the iterator.
-  typedef ByteType value_type;
-
-#if defined(GENERATING_DOCUMENTATION)
-  /// The type of the result of applying operator->() to the iterator.
-  /**
-   * If the buffer sequence stores buffer objects that are convertible to
-   * mutable_buffer, this is a pointer to a non-const ByteType. Otherwise, a
-   * pointer to a const ByteType.
-   */
-  typedef const_or_non_const_ByteType* pointer;
-#else // defined(GENERATING_DOCUMENTATION)
-  typedef typename detail::buffers_iterator_types<
-      BufferSequence, ByteType>::byte_type* pointer;
-#endif // defined(GENERATING_DOCUMENTATION)
-
-#if defined(GENERATING_DOCUMENTATION)
-  /// The type of the result of applying operator*() to the iterator.
-  /**
-   * If the buffer sequence stores buffer objects that are convertible to
-   * mutable_buffer, this is a reference to a non-const ByteType. Otherwise, a
-   * reference to a const ByteType.
-   */
-  typedef const_or_non_const_ByteType& reference;
-#else // defined(GENERATING_DOCUMENTATION)
-  typedef typename detail::buffers_iterator_types<
-      BufferSequence, ByteType>::byte_type& reference;
-#endif // defined(GENERATING_DOCUMENTATION)
-
-  /// The iterator category.
-  typedef std::random_access_iterator_tag iterator_category;
-
-  /// Default constructor. Creates an iterator in an undefined state.
-  buffers_iterator()
-    : current_buffer_(),
-      current_buffer_position_(0),
-      begin_(),
-      current_(),
-      end_(),
-      position_(0)
-  {
-  }
-
-  /// Construct an iterator representing the beginning of the buffers' data.
-  static buffers_iterator begin(const BufferSequence& buffers)
-#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
-    __attribute__ ((__noinline__))
-#endif // defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
-  {
-    buffers_iterator new_iter;
-    new_iter.begin_ = asio::buffer_sequence_begin(buffers);
-    new_iter.current_ = asio::buffer_sequence_begin(buffers);
-    new_iter.end_ = asio::buffer_sequence_end(buffers);
-    while (new_iter.current_ != new_iter.end_)
-    {
-      new_iter.current_buffer_ = *new_iter.current_;
-      if (new_iter.current_buffer_.size() > 0)
-        break;
-      ++new_iter.current_;
-    }
-    return new_iter;
-  }
-
-  /// Construct an iterator representing the end of the buffers' data.
-  static buffers_iterator end(const BufferSequence& buffers)
-#if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
-    __attribute__ ((__noinline__))
-#endif // defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
-  {
-    buffers_iterator new_iter;
-    new_iter.begin_ = asio::buffer_sequence_begin(buffers);
-    new_iter.current_ = asio::buffer_sequence_begin(buffers);
-    new_iter.end_ = asio::buffer_sequence_end(buffers);
-    while (new_iter.current_ != new_iter.end_)
-    {
-      buffer_type buffer = *new_iter.current_;
-      new_iter.position_ += buffer.size();
-      ++new_iter.current_;
-    }
-    return new_iter;
-  }
-
-  /// Dereference an iterator.
-  reference operator*() const
-  {
-    return dereference();
-  }
-
-  /// Dereference an iterator.
-  pointer operator->() const
-  {
-    return &dereference();
-  }
-
-  /// Access an individual element.
-  reference operator[](std::ptrdiff_t difference) const
-  {
-    buffers_iterator tmp(*this);
-    tmp.advance(difference);
-    return *tmp;
-  }
-
-  /// Increment operator (prefix).
-  buffers_iterator& operator++()
-  {
-    increment();
-    return *this;
-  }
-
-  /// Increment operator (postfix).
-  buffers_iterator operator++(int)
-  {
-    buffers_iterator tmp(*this);
-    ++*this;
-    return tmp;
-  }
-
-  /// Decrement operator (prefix).
-  buffers_iterator& operator--()
-  {
-    decrement();
-    return *this;
-  }
-
-  /// Decrement operator (postfix).
-  buffers_iterator operator--(int)
-  {
-    buffers_iterator tmp(*this);
-    --*this;
-    return tmp;
-  }
-
-  /// Addition operator.
-  buffers_iterator& operator+=(std::ptrdiff_t difference)
-  {
-    advance(difference);
-    return *this;
-  }
-
-  /// Subtraction operator.
-  buffers_iterator& operator-=(std::ptrdiff_t difference)
-  {
-    advance(-difference);
-    return *this;
-  }
-
-  /// Addition operator.
-  friend buffers_iterator operator+(const buffers_iterator& iter,
-      std::ptrdiff_t difference)
-  {
-    buffers_iterator tmp(iter);
-    tmp.advance(difference);
-    return tmp;
-  }
-
-  /// Addition operator.
-  friend buffers_iterator operator+(std::ptrdiff_t difference,
-      const buffers_iterator& iter)
-  {
-    buffers_iterator tmp(iter);
-    tmp.advance(difference);
-    return tmp;
-  }
-
-  /// Subtraction operator.
-  friend buffers_iterator operator-(const buffers_iterator& iter,
-      std::ptrdiff_t difference)
-  {
-    buffers_iterator tmp(iter);
-    tmp.advance(-difference);
-    return tmp;
-  }
-
-  /// Subtraction operator.
-  friend std::ptrdiff_t operator-(const buffers_iterator& a,
-      const buffers_iterator& b)
-  {
-    return b.distance_to(a);
-  }
-
-  /// Test two iterators for equality.
-  friend bool operator==(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return a.equal(b);
-  }
-
-  /// Test two iterators for inequality.
-  friend bool operator!=(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return !a.equal(b);
-  }
-
-  /// Compare two iterators.
-  friend bool operator<(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return a.distance_to(b) > 0;
-  }
-
-  /// Compare two iterators.
-  friend bool operator<=(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return !(b < a);
-  }
-
-  /// Compare two iterators.
-  friend bool operator>(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return b < a;
-  }
-
-  /// Compare two iterators.
-  friend bool operator>=(const buffers_iterator& a, const buffers_iterator& b)
-  {
-    return !(a < b);
-  }
-
-private:
-  // Dereference the iterator.
-  reference dereference() const
-  {
-    return static_cast<pointer>(
-        current_buffer_.data())[current_buffer_position_];
-  }
-
-  // Compare two iterators for equality.
-  bool equal(const buffers_iterator& other) const
-  {
-    return position_ == other.position_;
-  }
-
-  // Increment the iterator.
-  void increment()
-  {
-    ASIO_ASSERT(current_ != end_ && "iterator out of bounds");
-    ++position_;
-
-    // Check if the increment can be satisfied by the current buffer.
-    ++current_buffer_position_;
-    if (current_buffer_position_ != current_buffer_.size())
-      return;
-
-    // Find the next non-empty buffer.
-    ++current_;
-    current_buffer_position_ = 0;
-    while (current_ != end_)
-    {
-      current_buffer_ = *current_;
-      if (current_buffer_.size() > 0)
-        return;
-      ++current_;
-    }
-  }
-
-  // Decrement the iterator.
-  void decrement()
-  {
-    ASIO_ASSERT(position_ > 0 && "iterator out of bounds");
-    --position_;
-
-    // Check if the decrement can be satisfied by the current buffer.
-    if (current_buffer_position_ != 0)
-    {
-      --current_buffer_position_;
-      return;
-    }
-
-    // Find the previous non-empty buffer.
-    buffer_sequence_iterator_type iter = current_;
-    while (iter != begin_)
-    {
-      --iter;
-      buffer_type buffer = *iter;
-      std::size_t buffer_size = buffer.size();
-      if (buffer_size > 0)
-      {
-        current_ = iter;
-        current_buffer_ = buffer;
-        current_buffer_position_ = buffer_size - 1;
-        return;
-      }
-    }
-  }
-
-  // Advance the iterator by the specified distance.
-  void advance(std::ptrdiff_t n)
-  {
-    if (n > 0)
-    {
-      ASIO_ASSERT(current_ != end_ && "iterator out of bounds");
-      for (;;)
-      {
-        std::ptrdiff_t current_buffer_balance
-          = current_buffer_.size() - current_buffer_position_;
-
-        // Check if the advance can be satisfied by the current buffer.
-        if (current_buffer_balance > n)
-        {
-          position_ += n;
-          current_buffer_position_ += n;
-          return;
-        }
-
-        // Update position.
-        n -= current_buffer_balance;
-        position_ += current_buffer_balance;
-
-        // Move to next buffer. If it is empty then it will be skipped on the
-        // next iteration of this loop.
-        if (++current_ == end_)
-        {
-          ASIO_ASSERT(n == 0 && "iterator out of bounds");
-          current_buffer_ = buffer_type();
-          current_buffer_position_ = 0;
-          return;
-        }
-        current_buffer_ = *current_;
-        current_buffer_position_ = 0;
-      }
-    }
-    else if (n < 0)
-    {
-      std::size_t abs_n = -n;
-      ASIO_ASSERT(position_ >= abs_n && "iterator out of bounds");
-      for (;;)
-      {
-        // Check if the advance can be satisfied by the current buffer.
-        if (current_buffer_position_ >= abs_n)
-        {
-          position_ -= abs_n;
-          current_buffer_position_ -= abs_n;
-          return;
-        }
-
-        // Update position.
-        abs_n -= current_buffer_position_;
-        position_ -= current_buffer_position_;
-
-        // Check if we've reached the beginning of the buffers.
-        if (current_ == begin_)
-        {
-          ASIO_ASSERT(abs_n == 0 && "iterator out of bounds");
-          current_buffer_position_ = 0;
-          return;
-        }
-
-        // Find the previous non-empty buffer.
-        buffer_sequence_iterator_type iter = current_;
-        while (iter != begin_)
-        {
-          --iter;
-          buffer_type buffer = *iter;
-          std::size_t buffer_size = buffer.size();
-          if (buffer_size > 0)
-          {
-            current_ = iter;
-            current_buffer_ = buffer;
-            current_buffer_position_ = buffer_size;
-            break;
-          }
-        }
-      }
-    }
-  }
-
-  // Determine the distance between two iterators.
-  std::ptrdiff_t distance_to(const buffers_iterator& other) const
-  {
-    return other.position_ - position_;
-  }
-
-  buffer_type current_buffer_;
-  std::size_t current_buffer_position_;
-  buffer_sequence_iterator_type begin_;
-  buffer_sequence_iterator_type current_;
-  buffer_sequence_iterator_type end_;
-  std::size_t position_;
-};
-
-/// Construct an iterator representing the beginning of the buffers' data.
-template <typename BufferSequence>
-inline buffers_iterator<BufferSequence> buffers_begin(
-    const BufferSequence& buffers)
-{
-  return buffers_iterator<BufferSequence>::begin(buffers);
-}
-
-/// Construct an iterator representing the end of the buffers' data.
-template <typename BufferSequence>
-inline buffers_iterator<BufferSequence> buffers_end(
-    const BufferSequence& buffers)
-{
-  return buffers_iterator<BufferSequence>::end(buffers);
-}
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_BUFFERS_ITERATOR_HPP