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//
// ssl/detail/buffered_handshake_op.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_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
#define ASIO_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/ssl/detail/engine.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ssl {
namespace detail {
template <typename ConstBufferSequence>
class buffered_handshake_op
{
public:
buffered_handshake_op(stream_base::handshake_type type,
const ConstBufferSequence& buffers)
: type_(type),
buffers_(buffers),
total_buffer_size_(asio::buffer_size(buffers_))
{
}
engine::want operator()(engine& eng,
asio::error_code& ec,
std::size_t& bytes_transferred) const
{
return this->process(eng, ec, bytes_transferred,
asio::buffer_sequence_begin(buffers_),
asio::buffer_sequence_end(buffers_));
}
template <typename Handler>
void call_handler(Handler& handler,
const asio::error_code& ec,
const std::size_t& bytes_transferred) const
{
handler(ec, bytes_transferred);
}
private:
template <typename Iterator>
engine::want process(engine& eng,
asio::error_code& ec,
std::size_t& bytes_transferred,
Iterator begin, Iterator end) const
{
Iterator iter = begin;
std::size_t accumulated_size = 0;
for (;;)
{
engine::want want = eng.handshake(type_, ec);
if (want != engine::want_input_and_retry
|| bytes_transferred == total_buffer_size_)
return want;
// Find the next buffer piece to be fed to the engine.
while (iter != end)
{
const_buffer buffer(*iter);
// Skip over any buffers which have already been consumed by the engine.
if (bytes_transferred >= accumulated_size + buffer.size())
{
accumulated_size += buffer.size();
++iter;
continue;
}
// The current buffer may have been partially consumed by the engine on
// a previous iteration. If so, adjust the buffer to point to the
// unused portion.
if (bytes_transferred > accumulated_size)
buffer = buffer + (bytes_transferred - accumulated_size);
// Pass the buffer to the engine, and update the bytes transferred to
// reflect the total number of bytes consumed so far.
bytes_transferred += buffer.size();
buffer = eng.put_input(buffer);
bytes_transferred -= buffer.size();
break;
}
}
}
stream_base::handshake_type type_;
ConstBufferSequence buffers_;
std::size_t total_buffer_size_;
};
} // namespace detail
} // namespace ssl
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_SSL_DETAIL_BUFFERED_HANDSHAKE_OP_HPP
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