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+//
+// impl/read_at.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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 BOOST_ASIO_IMPL_READ_AT_HPP
+#define BOOST_ASIO_IMPL_READ_AT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <algorithm>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/completion_condition.hpp>
+#include <boost/asio/detail/array_fwd.hpp>
+#include <boost/asio/detail/base_from_completion_cond.hpp>
+#include <boost/asio/detail/bind_handler.hpp>
+#include <boost/asio/detail/consuming_buffers.hpp>
+#include <boost/asio/detail/dependent_type.hpp>
+#include <boost/asio/detail/handler_alloc_helpers.hpp>
+#include <boost/asio/detail/handler_invoke_helpers.hpp>
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, boost::system::error_code& ec)
+{
+ ec = boost::system::error_code();
+ boost::asio::detail::consuming_buffers<
+ mutable_buffer, MutableBufferSequence> tmp(buffers);
+ std::size_t total_transferred = 0;
+ tmp.prepare(detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred)));
+ while (tmp.begin() != tmp.end())
+ {
+ std::size_t bytes_transferred = d.read_some_at(
+ offset + total_transferred, tmp, ec);
+ tmp.consume(bytes_transferred);
+ total_transferred += bytes_transferred;
+ tmp.prepare(detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred)));
+ }
+ return total_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, buffers, transfer_all(), ec);
+ boost::asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ boost::system::error_code& ec)
+{
+ return read_at(d, offset, buffers, transfer_all(), ec);
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, buffers, completion_condition, ec);
+ boost::asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition, boost::system::error_code& ec)
+{
+ ec = boost::system::error_code();
+ std::size_t total_transferred = 0;
+ std::size_t max_size = detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred));
+ std::size_t bytes_available = read_size_helper(b, max_size);
+ while (bytes_available > 0)
+ {
+ std::size_t bytes_transferred = d.read_some_at(
+ offset + total_transferred, b.prepare(bytes_available), ec);
+ b.commit(bytes_transferred);
+ total_transferred += bytes_transferred;
+ max_size = detail::adapt_completion_condition_result(
+ completion_condition(ec, total_transferred));
+ bytes_available = read_size_helper(b, max_size);
+ }
+ return total_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, b, transfer_all(), ec);
+ boost::asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ boost::system::error_code& ec)
+{
+ return read_at(d, offset, b, transfer_all(), ec);
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition)
+{
+ boost::system::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, b, completion_condition, ec);
+ boost::asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ class read_at_op
+ : detail::base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_op(AsyncRandomAccessReadDevice& device,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, ReadHandler& handler)
+ : detail::base_from_completion_cond<
+ CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ buffers_(buffers),
+ total_transferred_(0),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+ read_at_op(const read_at_op& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_op(read_at_op&& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ switch (start)
+ {
+ case 1:
+ buffers_.prepare(this->check_for_completion(ec, total_transferred_));
+ for (;;)
+ {
+ device_.async_read_some_at(offset_ + total_transferred_,
+ buffers_, BOOST_ASIO_MOVE_CAST(read_at_op)(*this));
+ return; default:
+ total_transferred_ += bytes_transferred;
+ buffers_.consume(bytes_transferred);
+ buffers_.prepare(this->check_for_completion(ec, total_transferred_));
+ if ((!ec && bytes_transferred == 0)
+ || buffers_.begin() == buffers_.end())
+ break;
+ }
+
+ handler_(ec, static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ boost::uint64_t offset_;
+ boost::asio::detail::consuming_buffers<
+ mutable_buffer, MutableBufferSequence> buffers_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_op<AsyncRandomAccessReadDevice,
+ boost::asio::mutable_buffers_1, CompletionCondition, ReadHandler>
+ : detail::base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_op(AsyncRandomAccessReadDevice& device,
+ boost::uint64_t offset, const boost::asio::mutable_buffers_1& buffers,
+ CompletionCondition completion_condition, ReadHandler& handler)
+ : detail::base_from_completion_cond<
+ CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ buffer_(buffers),
+ total_transferred_(0),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+ read_at_op(const read_at_op& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffer_(other.buffer_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_op(read_at_op&& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffer_(other.buffer_),
+ total_transferred_(other.total_transferred_),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ std::size_t n = 0;
+ switch (start)
+ {
+ case 1:
+ n = this->check_for_completion(ec, total_transferred_);
+ for (;;)
+ {
+ device_.async_read_some_at(offset_ + total_transferred_,
+ boost::asio::buffer(buffer_ + total_transferred_, n),
+ BOOST_ASIO_MOVE_CAST(read_at_op)(*this));
+ return; default:
+ total_transferred_ += bytes_transferred;
+ if ((!ec && bytes_transferred == 0)
+ || (n = this->check_for_completion(ec, total_transferred_)) == 0
+ || total_transferred_ == boost::asio::buffer_size(buffer_))
+ break;
+ }
+
+ handler_(ec, static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ boost::uint64_t offset_;
+ boost::asio::mutable_buffer buffer_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice, typename Elem,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_op<AsyncRandomAccessReadDevice, boost::array<Elem, 2>,
+ CompletionCondition, ReadHandler>
+ : detail::base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_op(AsyncRandomAccessReadDevice& device,
+ boost::uint64_t offset, const boost::array<Elem, 2>& buffers,
+ CompletionCondition completion_condition, ReadHandler& handler)
+ : detail::base_from_completion_cond<
+ CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ buffers_(buffers),
+ total_transferred_(0),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+ read_at_op(const read_at_op& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_op(read_at_op&& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ typename boost::asio::detail::dependent_type<Elem,
+ boost::array<boost::asio::mutable_buffer, 2> >::type bufs = {{
+ boost::asio::mutable_buffer(buffers_[0]),
+ boost::asio::mutable_buffer(buffers_[1]) }};
+ std::size_t buffer_size0 = boost::asio::buffer_size(bufs[0]);
+ std::size_t buffer_size1 = boost::asio::buffer_size(bufs[1]);
+ std::size_t n = 0;
+ switch (start)
+ {
+ case 1:
+ n = this->check_for_completion(ec, total_transferred_);
+ for (;;)
+ {
+ bufs[0] = boost::asio::buffer(bufs[0] + total_transferred_, n);
+ bufs[1] = boost::asio::buffer(
+ bufs[1] + (total_transferred_ < buffer_size0
+ ? 0 : total_transferred_ - buffer_size0),
+ n - boost::asio::buffer_size(bufs[0]));
+ device_.async_read_some_at(offset_ + total_transferred_,
+ bufs, BOOST_ASIO_MOVE_CAST(read_at_op)(*this));
+ return; default:
+ total_transferred_ += bytes_transferred;
+ if ((!ec && bytes_transferred == 0)
+ || (n = this->check_for_completion(ec, total_transferred_)) == 0
+ || total_transferred_ == buffer_size0 + buffer_size1)
+ break;
+ }
+
+ handler_(ec, static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ boost::uint64_t offset_;
+ boost::array<Elem, 2> buffers_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+#if defined(BOOST_ASIO_HAS_STD_ARRAY)
+
+ template <typename AsyncRandomAccessReadDevice, typename Elem,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_op<AsyncRandomAccessReadDevice, std::array<Elem, 2>,
+ CompletionCondition, ReadHandler>
+ : detail::base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_op(AsyncRandomAccessReadDevice& device,
+ boost::uint64_t offset, const std::array<Elem, 2>& buffers,
+ CompletionCondition completion_condition, ReadHandler& handler)
+ : detail::base_from_completion_cond<
+ CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ buffers_(buffers),
+ total_transferred_(0),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+ read_at_op(const read_at_op& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_op(read_at_op&& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ total_transferred_(other.total_transferred_),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ typename boost::asio::detail::dependent_type<Elem,
+ std::array<boost::asio::mutable_buffer, 2> >::type bufs = {{
+ boost::asio::mutable_buffer(buffers_[0]),
+ boost::asio::mutable_buffer(buffers_[1]) }};
+ std::size_t buffer_size0 = boost::asio::buffer_size(bufs[0]);
+ std::size_t buffer_size1 = boost::asio::buffer_size(bufs[1]);
+ std::size_t n = 0;
+ switch (start)
+ {
+ case 1:
+ n = this->check_for_completion(ec, total_transferred_);
+ for (;;)
+ {
+ bufs[0] = boost::asio::buffer(bufs[0] + total_transferred_, n);
+ bufs[1] = boost::asio::buffer(
+ bufs[1] + (total_transferred_ < buffer_size0
+ ? 0 : total_transferred_ - buffer_size0),
+ n - boost::asio::buffer_size(bufs[0]));
+ device_.async_read_some_at(offset_ + total_transferred_,
+ bufs, BOOST_ASIO_MOVE_CAST(read_at_op)(*this));
+ return; default:
+ total_transferred_ += bytes_transferred;
+ if ((!ec && bytes_transferred == 0)
+ || (n = this->check_for_completion(ec, total_transferred_)) == 0
+ || total_transferred_ == buffer_size0 + buffer_size1)
+ break;
+ }
+
+ handler_(ec, static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ boost::uint64_t offset_;
+ std::array<Elem, 2> buffers_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+#endif // defined(BOOST_ASIO_HAS_STD_ARRAY)
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void* asio_handler_allocate(std::size_t size,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ return boost_asio_handler_alloc_helpers::allocate(
+ size, this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_alloc_helpers::deallocate(
+ pointer, size, this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void asio_handler_invoke(Function& function,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline void asio_handler_invoke(const Function& function,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ typename ReadHandler>
+ inline read_at_op<AsyncRandomAccessReadDevice,
+ MutableBufferSequence, CompletionCondition, ReadHandler>
+ make_read_at_op(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, ReadHandler handler)
+ {
+ return read_at_op<AsyncRandomAccessReadDevice,
+ MutableBufferSequence, CompletionCondition, ReadHandler>(
+ d, offset, buffers, completion_condition, handler);
+ }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition,
+ BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ // If you get an error on the following line it means that your handler does
+ // not meet the documented type requirements for a ReadHandler.
+ BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ detail::make_read_at_op(
+ d, offset, buffers, completion_condition,
+ BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))(
+ boost::system::error_code(), 0, 1);
+}
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, const MutableBufferSequence& buffers,
+ BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ // If you get an error on the following line it means that your handler does
+ // not meet the documented type requirements for a ReadHandler.
+ BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ detail::make_read_at_op(
+ d, offset, buffers, transfer_all(),
+ BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))(
+ boost::system::error_code(), 0, 1);
+}
+
+#if !defined(BOOST_NO_IOSTREAM)
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_streambuf_op
+ : detail::base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_streambuf_op(AsyncRandomAccessReadDevice& device,
+ boost::uint64_t offset, basic_streambuf<Allocator>& streambuf,
+ CompletionCondition completion_condition, ReadHandler& handler)
+ : detail::base_from_completion_cond<
+ CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ streambuf_(streambuf),
+ total_transferred_(0),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+ read_at_streambuf_op(const read_at_streambuf_op& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ streambuf_(other.streambuf_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_streambuf_op(read_at_streambuf_op&& other)
+ : detail::base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ streambuf_(other.streambuf_),
+ total_transferred_(other.total_transferred_),
+ handler_(BOOST_ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+ void operator()(const boost::system::error_code& ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ std::size_t max_size, bytes_available;
+ switch (start)
+ {
+ case 1:
+ max_size = this->check_for_completion(ec, total_transferred_);
+ bytes_available = read_size_helper(streambuf_, max_size);
+ for (;;)
+ {
+ device_.async_read_some_at(offset_ + total_transferred_,
+ streambuf_.prepare(bytes_available),
+ BOOST_ASIO_MOVE_CAST(read_at_streambuf_op)(*this));
+ return; default:
+ total_transferred_ += bytes_transferred;
+ streambuf_.commit(bytes_transferred);
+ max_size = this->check_for_completion(ec, total_transferred_);
+ bytes_available = read_size_helper(streambuf_, max_size);
+ if ((!ec && bytes_transferred == 0) || bytes_available == 0)
+ break;
+ }
+
+ handler_(ec, static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ boost::uint64_t offset_;
+ boost::asio::basic_streambuf<Allocator>& streambuf_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline void* asio_handler_allocate(std::size_t size,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ return boost_asio_handler_alloc_helpers::allocate(
+ size, this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline void asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_alloc_helpers::deallocate(
+ pointer, size, this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition, typename ReadHandler>
+ inline void asio_handler_invoke(Function& function,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition, typename ReadHandler>
+ inline void asio_handler_invoke(const Function& function,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ boost_asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+ }
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline read_at_streambuf_op<AsyncRandomAccessReadDevice,
+ Allocator, CompletionCondition, ReadHandler>
+ make_read_at_streambuf_op(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition, ReadHandler handler)
+ {
+ return read_at_streambuf_op<AsyncRandomAccessReadDevice,
+ Allocator, CompletionCondition, ReadHandler>(
+ d, offset, b, completion_condition, handler);
+ }
+} // namespace detail
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition,
+ BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ // If you get an error on the following line it means that your handler does
+ // not meet the documented type requirements for a ReadHandler.
+ BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ detail::make_read_at_streambuf_op(
+ d, offset, b, completion_condition,
+ BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))(
+ boost::system::error_code(), 0, 1);
+}
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename ReadHandler>
+inline void async_read_at(AsyncRandomAccessReadDevice& d,
+ boost::uint64_t offset, boost::asio::basic_streambuf<Allocator>& b,
+ BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ // If you get an error on the following line it means that your handler does
+ // not meet the documented type requirements for a ReadHandler.
+ BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ detail::make_read_at_streambuf_op(
+ d, offset, b, transfer_all(),
+ BOOST_ASIO_MOVE_CAST(ReadHandler)(handler))(
+ boost::system::error_code(), 0, 1);
+}
+
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_READ_AT_HPP