Chris@16: //
Chris@16: // impl/write_at.hpp
Chris@16: // ~~~~~~~~~~~~~~~~~
Chris@16: //
Chris@101: // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_ASIO_IMPL_WRITE_AT_HPP
Chris@16: #define BOOST_ASIO_IMPL_WRITE_AT_HPP
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: # pragma once
Chris@16: #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16: 
Chris@16: #include <boost/asio/buffer.hpp>
Chris@16: #include <boost/asio/completion_condition.hpp>
Chris@16: #include <boost/asio/detail/array_fwd.hpp>
Chris@16: #include <boost/asio/detail/base_from_completion_cond.hpp>
Chris@16: #include <boost/asio/detail/bind_handler.hpp>
Chris@16: #include <boost/asio/detail/consuming_buffers.hpp>
Chris@16: #include <boost/asio/detail/dependent_type.hpp>
Chris@16: #include <boost/asio/detail/handler_alloc_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_cont_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_invoke_helpers.hpp>
Chris@16: #include <boost/asio/detail/handler_type_requirements.hpp>
Chris@16: #include <boost/asio/detail/throw_error.hpp>
Chris@16: 
Chris@16: #include <boost/asio/detail/push_options.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace asio {
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:     typename CompletionCondition>
Chris@16: std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:     CompletionCondition completion_condition, boost::system::error_code& ec)
Chris@16: {
Chris@16:   ec = boost::system::error_code();
Chris@16:   boost::asio::detail::consuming_buffers<
Chris@16:     const_buffer, ConstBufferSequence> tmp(buffers);
Chris@16:   std::size_t total_transferred = 0;
Chris@16:   tmp.prepare(detail::adapt_completion_condition_result(
Chris@16:         completion_condition(ec, total_transferred)));
Chris@16:   while (tmp.begin() != tmp.end())
Chris@16:   {
Chris@16:     std::size_t bytes_transferred = d.write_some_at(
Chris@16:         offset + total_transferred, tmp, ec);
Chris@16:     tmp.consume(bytes_transferred);
Chris@16:     total_transferred += bytes_transferred;
Chris@16:     tmp.prepare(detail::adapt_completion_condition_result(
Chris@16:           completion_condition(ec, total_transferred)));
Chris@16:   }
Chris@16:   return total_transferred;
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers)
Chris@16: {
Chris@16:   boost::system::error_code ec;
Chris@16:   std::size_t bytes_transferred = write_at(
Chris@16:       d, offset, buffers, transfer_all(), ec);
Chris@16:   boost::asio::detail::throw_error(ec, "write_at");
Chris@16:   return bytes_transferred;
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:     boost::system::error_code& ec)
Chris@16: {
Chris@16:   return write_at(d, offset, buffers, transfer_all(), ec);
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:     typename CompletionCondition>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:     CompletionCondition completion_condition)
Chris@16: {
Chris@16:   boost::system::error_code ec;
Chris@16:   std::size_t bytes_transferred = write_at(
Chris@16:       d, offset, buffers, completion_condition, ec);
Chris@16:   boost::asio::detail::throw_error(ec, "write_at");
Chris@16:   return bytes_transferred;
Chris@16: }
Chris@16: 
Chris@16: #if !defined(BOOST_ASIO_NO_IOSTREAM)
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename Allocator,
Chris@16:     typename CompletionCondition>
Chris@16: std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
Chris@16:     CompletionCondition completion_condition, boost::system::error_code& ec)
Chris@16: {
Chris@16:   std::size_t bytes_transferred = write_at(
Chris@16:       d, offset, b.data(), completion_condition, ec);
Chris@16:   b.consume(bytes_transferred);
Chris@16:   return bytes_transferred;
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename Allocator>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b)
Chris@16: {
Chris@16:   boost::system::error_code ec;
Chris@16:   std::size_t bytes_transferred = write_at(d, offset, b, transfer_all(), ec);
Chris@16:   boost::asio::detail::throw_error(ec, "write_at");
Chris@16:   return bytes_transferred;
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename Allocator>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
Chris@16:     boost::system::error_code& ec)
Chris@16: {
Chris@16:   return write_at(d, offset, b, transfer_all(), ec);
Chris@16: }
Chris@16: 
Chris@16: template <typename SyncRandomAccessWriteDevice, typename Allocator,
Chris@16:     typename CompletionCondition>
Chris@16: inline std::size_t write_at(SyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
Chris@16:     CompletionCondition completion_condition)
Chris@16: {
Chris@16:   boost::system::error_code ec;
Chris@16:   std::size_t bytes_transferred = write_at(
Chris@16:       d, offset, b, completion_condition, ec);
Chris@16:   boost::asio::detail::throw_error(ec, "write_at");
Chris@16:   return bytes_transferred;
Chris@16: }
Chris@16: 
Chris@16: #endif // !defined(BOOST_ASIO_NO_IOSTREAM)
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   class write_at_op
Chris@16:     : detail::base_from_completion_cond<CompletionCondition>
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_op(AsyncRandomAccessWriteDevice& device,
Chris@16:         uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:         CompletionCondition completion_condition, WriteHandler& handler)
Chris@16:       : detail::base_from_completion_cond<
Chris@16:           CompletionCondition>(completion_condition),
Chris@16:         device_(device),
Chris@16:         offset_(offset),
Chris@16:         buffers_(buffers),
Chris@16:         start_(0),
Chris@16:         total_transferred_(0),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_op(const write_at_op& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_op(write_at_op&& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         std::size_t bytes_transferred, int start = 0)
Chris@16:     {
Chris@16:       switch (start_ = start)
Chris@16:       {
Chris@16:         case 1:
Chris@16:         buffers_.prepare(this->check_for_completion(ec, total_transferred_));
Chris@16:         for (;;)
Chris@16:         {
Chris@16:           device_.async_write_some_at(
Chris@16:               offset_ + total_transferred_, buffers_,
Chris@16:               BOOST_ASIO_MOVE_CAST(write_at_op)(*this));
Chris@16:           return; default:
Chris@16:           total_transferred_ += bytes_transferred;
Chris@16:           buffers_.consume(bytes_transferred);
Chris@16:           buffers_.prepare(this->check_for_completion(ec, total_transferred_));
Chris@16:           if ((!ec && bytes_transferred == 0)
Chris@16:               || buffers_.begin() == buffers_.end())
Chris@16:             break;
Chris@16:         }
Chris@16: 
Chris@16:         handler_(ec, static_cast<const std::size_t&>(total_transferred_));
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     AsyncRandomAccessWriteDevice& device_;
Chris@16:     uint64_t offset_;
Chris@16:     boost::asio::detail::consuming_buffers<
Chris@16:       const_buffer, ConstBufferSequence> buffers_;
Chris@16:     int start_;
Chris@16:     std::size_t total_transferred_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   class write_at_op<AsyncRandomAccessWriteDevice,
Chris@16:       boost::asio::mutable_buffers_1, CompletionCondition, WriteHandler>
Chris@16:     : detail::base_from_completion_cond<CompletionCondition>
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_op(AsyncRandomAccessWriteDevice& device,
Chris@16:         uint64_t offset, const boost::asio::mutable_buffers_1& buffers,
Chris@16:         CompletionCondition completion_condition,
Chris@16:         WriteHandler& handler)
Chris@16:       : detail::base_from_completion_cond<
Chris@16:           CompletionCondition>(completion_condition),
Chris@16:         device_(device),
Chris@16:         offset_(offset),
Chris@16:         buffer_(buffers),
Chris@16:         start_(0),
Chris@16:         total_transferred_(0),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_op(const write_at_op& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffer_(other.buffer_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_op(write_at_op&& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffer_(other.buffer_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         std::size_t bytes_transferred, int start = 0)
Chris@16:     {
Chris@16:       std::size_t n = 0;
Chris@16:       switch (start_ = start)
Chris@16:       {
Chris@16:         case 1:
Chris@16:         n = this->check_for_completion(ec, total_transferred_);
Chris@16:         for (;;)
Chris@16:         {
Chris@16:           device_.async_write_some_at(offset_ + total_transferred_,
Chris@16:               boost::asio::buffer(buffer_ + total_transferred_, n),
Chris@16:               BOOST_ASIO_MOVE_CAST(write_at_op)(*this));
Chris@16:           return; default:
Chris@16:           total_transferred_ += bytes_transferred;
Chris@16:           if ((!ec && bytes_transferred == 0)
Chris@16:               || (n = this->check_for_completion(ec, total_transferred_)) == 0
Chris@16:               || total_transferred_ == boost::asio::buffer_size(buffer_))
Chris@16:             break;
Chris@16:         }
Chris@16: 
Chris@16:         handler_(ec, static_cast<const std::size_t&>(total_transferred_));
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     AsyncRandomAccessWriteDevice& device_;
Chris@16:     uint64_t offset_;
Chris@16:     boost::asio::mutable_buffer buffer_;
Chris@16:     int start_;
Chris@16:     std::size_t total_transferred_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   class write_at_op<AsyncRandomAccessWriteDevice, boost::asio::const_buffers_1,
Chris@16:       CompletionCondition, WriteHandler>
Chris@16:     : detail::base_from_completion_cond<CompletionCondition>
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_op(AsyncRandomAccessWriteDevice& device,
Chris@16:         uint64_t offset, const boost::asio::const_buffers_1& buffers,
Chris@16:         CompletionCondition completion_condition,
Chris@16:         WriteHandler& handler)
Chris@16:       : detail::base_from_completion_cond<
Chris@16:           CompletionCondition>(completion_condition),
Chris@16:         device_(device),
Chris@16:         offset_(offset),
Chris@16:         buffer_(buffers),
Chris@16:         start_(0),
Chris@16:         total_transferred_(0),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_op(const write_at_op& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffer_(other.buffer_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_op(write_at_op&& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffer_(other.buffer_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         std::size_t bytes_transferred, int start = 0)
Chris@16:     {
Chris@16:       std::size_t n = 0;
Chris@16:       switch (start_ = start)
Chris@16:       {
Chris@16:         case 1:
Chris@16:         n = this->check_for_completion(ec, total_transferred_);
Chris@16:         for (;;)
Chris@16:         {
Chris@16:           device_.async_write_some_at(offset_ + total_transferred_,
Chris@16:               boost::asio::buffer(buffer_ + total_transferred_, n),
Chris@16:               BOOST_ASIO_MOVE_CAST(write_at_op)(*this));
Chris@16:           return; default:
Chris@16:           total_transferred_ += bytes_transferred;
Chris@16:           if ((!ec && bytes_transferred == 0)
Chris@16:               || (n = this->check_for_completion(ec, total_transferred_)) == 0
Chris@16:               || total_transferred_ == boost::asio::buffer_size(buffer_))
Chris@16:             break;
Chris@16:         }
Chris@16: 
Chris@16:         handler_(ec, static_cast<const std::size_t&>(total_transferred_));
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     AsyncRandomAccessWriteDevice& device_;
Chris@16:     uint64_t offset_;
Chris@16:     boost::asio::const_buffer buffer_;
Chris@16:     int start_;
Chris@16:     std::size_t total_transferred_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename Elem,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   class write_at_op<AsyncRandomAccessWriteDevice, boost::array<Elem, 2>,
Chris@16:       CompletionCondition, WriteHandler>
Chris@16:     : detail::base_from_completion_cond<CompletionCondition>
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_op(AsyncRandomAccessWriteDevice& device,
Chris@16:         uint64_t offset, const boost::array<Elem, 2>& buffers,
Chris@16:         CompletionCondition completion_condition, WriteHandler& handler)
Chris@16:       : detail::base_from_completion_cond<
Chris@16:           CompletionCondition>(completion_condition),
Chris@16:         device_(device),
Chris@16:         offset_(offset),
Chris@16:         buffers_(buffers),
Chris@16:         start_(0),
Chris@16:         total_transferred_(0),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_op(const write_at_op& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_op(write_at_op&& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         std::size_t bytes_transferred, int start = 0)
Chris@16:     {
Chris@16:       typename boost::asio::detail::dependent_type<Elem,
Chris@16:           boost::array<boost::asio::const_buffer, 2> >::type bufs = {{
Chris@16:         boost::asio::const_buffer(buffers_[0]),
Chris@16:         boost::asio::const_buffer(buffers_[1]) }};
Chris@16:       std::size_t buffer_size0 = boost::asio::buffer_size(bufs[0]);
Chris@16:       std::size_t buffer_size1 = boost::asio::buffer_size(bufs[1]);
Chris@16:       std::size_t n = 0;
Chris@16:       switch (start_ = start)
Chris@16:       {
Chris@16:         case 1:
Chris@16:         n = this->check_for_completion(ec, total_transferred_);
Chris@16:         for (;;)
Chris@16:         {
Chris@16:           bufs[0] = boost::asio::buffer(bufs[0] + total_transferred_, n);
Chris@16:           bufs[1] = boost::asio::buffer(
Chris@16:               bufs[1] + (total_transferred_ < buffer_size0
Chris@16:                 ? 0 : total_transferred_ - buffer_size0),
Chris@16:               n - boost::asio::buffer_size(bufs[0]));
Chris@16:           device_.async_write_some_at(offset_ + total_transferred_,
Chris@16:               bufs, BOOST_ASIO_MOVE_CAST(write_at_op)(*this));
Chris@16:           return; default:
Chris@16:           total_transferred_ += bytes_transferred;
Chris@16:           if ((!ec && bytes_transferred == 0)
Chris@16:               || (n = this->check_for_completion(ec, total_transferred_)) == 0
Chris@16:               || total_transferred_ == buffer_size0 + buffer_size1)
Chris@16:             break;
Chris@16:         }
Chris@16: 
Chris@16:         handler_(ec, static_cast<const std::size_t&>(total_transferred_));
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     AsyncRandomAccessWriteDevice& device_;
Chris@16:     uint64_t offset_;
Chris@16:     boost::array<Elem, 2> buffers_;
Chris@16:     int start_;
Chris@16:     std::size_t total_transferred_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_STD_ARRAY)
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename Elem,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   class write_at_op<AsyncRandomAccessWriteDevice, std::array<Elem, 2>,
Chris@16:       CompletionCondition, WriteHandler>
Chris@16:     : detail::base_from_completion_cond<CompletionCondition>
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_op(AsyncRandomAccessWriteDevice& device,
Chris@16:         uint64_t offset, const std::array<Elem, 2>& buffers,
Chris@16:         CompletionCondition completion_condition, WriteHandler& handler)
Chris@16:       : detail::base_from_completion_cond<
Chris@16:           CompletionCondition>(completion_condition),
Chris@16:         device_(device),
Chris@16:         offset_(offset),
Chris@16:         buffers_(buffers),
Chris@16:         start_(0),
Chris@16:         total_transferred_(0),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_op(const write_at_op& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_op(write_at_op&& other)
Chris@16:       : detail::base_from_completion_cond<CompletionCondition>(other),
Chris@16:         device_(other.device_),
Chris@16:         offset_(other.offset_),
Chris@16:         buffers_(other.buffers_),
Chris@16:         start_(other.start_),
Chris@16:         total_transferred_(other.total_transferred_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         std::size_t bytes_transferred, int start = 0)
Chris@16:     {
Chris@16:       typename boost::asio::detail::dependent_type<Elem,
Chris@16:           std::array<boost::asio::const_buffer, 2> >::type bufs = {{
Chris@16:         boost::asio::const_buffer(buffers_[0]),
Chris@16:         boost::asio::const_buffer(buffers_[1]) }};
Chris@16:       std::size_t buffer_size0 = boost::asio::buffer_size(bufs[0]);
Chris@16:       std::size_t buffer_size1 = boost::asio::buffer_size(bufs[1]);
Chris@16:       std::size_t n = 0;
Chris@16:       switch (start_ = start)
Chris@16:       {
Chris@16:         case 1:
Chris@16:         n = this->check_for_completion(ec, total_transferred_);
Chris@16:         for (;;)
Chris@16:         {
Chris@16:           bufs[0] = boost::asio::buffer(bufs[0] + total_transferred_, n);
Chris@16:           bufs[1] = boost::asio::buffer(
Chris@16:               bufs[1] + (total_transferred_ < buffer_size0
Chris@16:                 ? 0 : total_transferred_ - buffer_size0),
Chris@16:               n - boost::asio::buffer_size(bufs[0]));
Chris@16:           device_.async_write_some_at(offset_ + total_transferred_,
Chris@16:               bufs, BOOST_ASIO_MOVE_CAST(write_at_op)(*this));
Chris@16:           return; default:
Chris@16:           total_transferred_ += bytes_transferred;
Chris@16:           if ((!ec && bytes_transferred == 0)
Chris@16:               || (n = this->check_for_completion(ec, total_transferred_)) == 0
Chris@16:               || total_transferred_ == buffer_size0 + buffer_size1)
Chris@16:             break;
Chris@16:         }
Chris@16: 
Chris@16:         handler_(ec, static_cast<const std::size_t&>(total_transferred_));
Chris@16:       }
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     AsyncRandomAccessWriteDevice& device_;
Chris@16:     uint64_t offset_;
Chris@16:     std::array<Elem, 2> buffers_;
Chris@16:     int start_;
Chris@16:     std::size_t total_transferred_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16: #endif // defined(BOOST_ASIO_HAS_STD_ARRAY)
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   inline void* asio_handler_allocate(std::size_t size,
Chris@16:       write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:         CompletionCondition, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_alloc_helpers::allocate(
Chris@16:         size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   inline void asio_handler_deallocate(void* pointer, std::size_t size,
Chris@16:       write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:         CompletionCondition, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_alloc_helpers::deallocate(
Chris@16:         pointer, size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   inline bool asio_handler_is_continuation(
Chris@16:       write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:         CompletionCondition, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     return this_handler->start_ == 0 ? true
Chris@16:       : boost_asio_handler_cont_helpers::is_continuation(
Chris@16:           this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename AsyncRandomAccessWriteDevice,
Chris@16:       typename ConstBufferSequence, typename CompletionCondition,
Chris@16:       typename WriteHandler>
Chris@16:   inline void asio_handler_invoke(Function& function,
Chris@16:       write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:         CompletionCondition, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename AsyncRandomAccessWriteDevice,
Chris@16:       typename ConstBufferSequence, typename CompletionCondition,
Chris@16:       typename WriteHandler>
Chris@16:   inline void asio_handler_invoke(const Function& function,
Chris@16:       write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:         CompletionCondition, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:       typename CompletionCondition, typename WriteHandler>
Chris@16:   inline write_at_op<AsyncRandomAccessWriteDevice,
Chris@16:       ConstBufferSequence, CompletionCondition, WriteHandler>
Chris@16:   make_write_at_op(AsyncRandomAccessWriteDevice& d,
Chris@16:       uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:       CompletionCondition completion_condition, WriteHandler handler)
Chris@16:   {
Chris@16:     return write_at_op<AsyncRandomAccessWriteDevice,
Chris@16:       ConstBufferSequence, CompletionCondition, WriteHandler>(
Chris@16:         d, offset, buffers, completion_condition, handler);
Chris@16:   }
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:     typename CompletionCondition, typename WriteHandler>
Chris@16: inline BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: async_write_at(AsyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:     CompletionCondition completion_condition,
Chris@16:     BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a WriteHandler.
Chris@16:   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     WriteHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));
Chris@16: 
Chris@16:   detail::write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:     CompletionCondition, BOOST_ASIO_HANDLER_TYPE(
Chris@16:       WriteHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:         d, offset, buffers, completion_condition, init.handler)(
Chris@16:           boost::system::error_code(), 0, 1);
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: template <typename AsyncRandomAccessWriteDevice, typename ConstBufferSequence,
Chris@16:     typename WriteHandler>
Chris@16: inline BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: async_write_at(AsyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, const ConstBufferSequence& buffers,
Chris@16:     BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a WriteHandler.
Chris@16:   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     WriteHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));
Chris@16: 
Chris@16:   detail::write_at_op<AsyncRandomAccessWriteDevice, ConstBufferSequence,
Chris@16:     detail::transfer_all_t, BOOST_ASIO_HANDLER_TYPE(
Chris@16:       WriteHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:         d, offset, buffers, transfer_all(), init.handler)(
Chris@16:           boost::system::error_code(), 0, 1);
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: #if !defined(BOOST_ASIO_NO_IOSTREAM)
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16:   template <typename Allocator, typename WriteHandler>
Chris@16:   class write_at_streambuf_op
Chris@16:   {
Chris@16:   public:
Chris@16:     write_at_streambuf_op(
Chris@16:         boost::asio::basic_streambuf<Allocator>& streambuf,
Chris@16:         WriteHandler& handler)
Chris@16:       : streambuf_(streambuf),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(handler))
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_ASIO_HAS_MOVE)
Chris@16:     write_at_streambuf_op(const write_at_streambuf_op& other)
Chris@16:       : streambuf_(other.streambuf_),
Chris@16:         handler_(other.handler_)
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     write_at_streambuf_op(write_at_streambuf_op&& other)
Chris@16:       : streambuf_(other.streambuf_),
Chris@16:         handler_(BOOST_ASIO_MOVE_CAST(WriteHandler)(other.handler_))
Chris@16:     {
Chris@16:     }
Chris@16: #endif // defined(BOOST_ASIO_HAS_MOVE)
Chris@16: 
Chris@16:     void operator()(const boost::system::error_code& ec,
Chris@16:         const std::size_t bytes_transferred)
Chris@16:     {
Chris@16:       streambuf_.consume(bytes_transferred);
Chris@16:       handler_(ec, bytes_transferred);
Chris@16:     }
Chris@16: 
Chris@16:   //private:
Chris@16:     boost::asio::basic_streambuf<Allocator>& streambuf_;
Chris@16:     WriteHandler handler_;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename Allocator, typename WriteHandler>
Chris@16:   inline void* asio_handler_allocate(std::size_t size,
Chris@16:       write_at_streambuf_op<Allocator, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_alloc_helpers::allocate(
Chris@16:         size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Allocator, typename WriteHandler>
Chris@16:   inline void asio_handler_deallocate(void* pointer, std::size_t size,
Chris@16:       write_at_streambuf_op<Allocator, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_alloc_helpers::deallocate(
Chris@16:         pointer, size, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Allocator, typename WriteHandler>
Chris@16:   inline bool asio_handler_is_continuation(
Chris@16:       write_at_streambuf_op<Allocator, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     return boost_asio_handler_cont_helpers::is_continuation(
Chris@16:         this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename Allocator, typename WriteHandler>
Chris@16:   inline void asio_handler_invoke(Function& function,
Chris@16:       write_at_streambuf_op<Allocator, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Function, typename Allocator, typename WriteHandler>
Chris@16:   inline void asio_handler_invoke(const Function& function,
Chris@16:       write_at_streambuf_op<Allocator, WriteHandler>* this_handler)
Chris@16:   {
Chris@16:     boost_asio_handler_invoke_helpers::invoke(
Chris@16:         function, this_handler->handler_);
Chris@16:   }
Chris@16: 
Chris@16:   template <typename Allocator, typename WriteHandler>
Chris@16:   inline write_at_streambuf_op<Allocator, WriteHandler>
Chris@16:   make_write_at_streambuf_op(
Chris@16:       boost::asio::basic_streambuf<Allocator>& b, WriteHandler handler)
Chris@16:   {
Chris@16:     return write_at_streambuf_op<Allocator, WriteHandler>(b, handler);
Chris@16:   }
Chris@16: } // namespace detail
Chris@16: 
Chris@16: template <typename AsyncRandomAccessWriteDevice, typename Allocator,
Chris@16:     typename CompletionCondition, typename WriteHandler>
Chris@16: inline BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: async_write_at(AsyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
Chris@16:     CompletionCondition completion_condition,
Chris@16:     BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a WriteHandler.
Chris@16:   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     WriteHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));
Chris@16: 
Chris@16:   async_write_at(d, offset, b.data(), completion_condition,
Chris@16:     detail::write_at_streambuf_op<Allocator, BOOST_ASIO_HANDLER_TYPE(
Chris@16:       WriteHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:         b, init.handler));
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: template <typename AsyncRandomAccessWriteDevice, typename Allocator,
Chris@16:     typename WriteHandler>
Chris@16: inline BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
Chris@16:     void (boost::system::error_code, std::size_t))
Chris@16: async_write_at(AsyncRandomAccessWriteDevice& d,
Chris@16:     uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
Chris@16:     BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
Chris@16: {
Chris@16:   // If you get an error on the following line it means that your handler does
Chris@16:   // not meet the documented type requirements for a WriteHandler.
Chris@16:   BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
Chris@16: 
Chris@16:   detail::async_result_init<
Chris@16:     WriteHandler, void (boost::system::error_code, std::size_t)> init(
Chris@16:       BOOST_ASIO_MOVE_CAST(WriteHandler)(handler));
Chris@16: 
Chris@16:   async_write_at(d, offset, b.data(), transfer_all(),
Chris@16:     detail::write_at_streambuf_op<Allocator, BOOST_ASIO_HANDLER_TYPE(
Chris@16:       WriteHandler, void (boost::system::error_code, std::size_t))>(
Chris@16:         b, init.handler));
Chris@16: 
Chris@16:   return init.result.get();
Chris@16: }
Chris@16: 
Chris@16: #endif // !defined(BOOST_ASIO_NO_IOSTREAM)
Chris@16: 
Chris@16: } // namespace asio
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/asio/detail/pop_options.hpp>
Chris@16: 
Chris@16: #endif // BOOST_ASIO_IMPL_WRITE_AT_HPP