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+//
+// impl/read_at.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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_IMPL_READ_AT_HPP
+#define ASIO_IMPL_READ_AT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <algorithm>
+#include "asio/associator.hpp"
+#include "asio/buffer.hpp"
+#include "asio/completion_condition.hpp"
+#include "asio/detail/array_fwd.hpp"
+#include "asio/detail/base_from_cancellation_state.hpp"
+#include "asio/detail/base_from_completion_cond.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/consuming_buffers.hpp"
+#include "asio/detail/dependent_type.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_cont_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/handler_tracking.hpp"
+#include "asio/detail/handler_type_requirements.hpp"
+#include "asio/detail/non_const_lvalue.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+namespace detail
+{
+ template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename MutableBufferIterator, typename CompletionCondition>
+ std::size_t read_at_buffer_sequence(SyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ const MutableBufferIterator&, CompletionCondition completion_condition,
+ asio::error_code& ec)
+ {
+ ec = asio::error_code();
+ asio::detail::consuming_buffers<mutable_buffer,
+ MutableBufferSequence, MutableBufferIterator> tmp(buffers);
+ while (!tmp.empty())
+ {
+ if (std::size_t max_size = detail::adapt_completion_condition_result(
+ completion_condition(ec, tmp.total_consumed())))
+ {
+ tmp.consume(d.read_some_at(offset + tmp.total_consumed(),
+ tmp.prepare(max_size), ec));
+ }
+ else
+ break;
+ }
+ return tmp.total_consumed();
+ }
+} // namespace detail
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition, asio::error_code& ec)
+{
+ return detail::read_at_buffer_sequence(d, offset, buffers,
+ asio::buffer_sequence_begin(buffers),
+ ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec);
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers)
+{
+ asio::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, buffers, transfer_all(), ec);
+ asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ asio::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,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition)
+{
+ asio::error_code ec;
+ std::size_t bytes_transferred = read_at(d, offset, buffers,
+ ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec);
+ asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+#if !defined(ASIO_NO_EXTENSIONS)
+#if !defined(ASIO_NO_IOSTREAM)
+
+template <typename SyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition>
+std::size_t read_at(SyncRandomAccessReadDevice& d,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition, asio::error_code& ec)
+{
+ ec = asio::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,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b)
+{
+ asio::error_code ec;
+ std::size_t bytes_transferred = read_at(
+ d, offset, b, transfer_all(), ec);
+ asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+template <typename SyncRandomAccessReadDevice, typename Allocator>
+inline std::size_t read_at(SyncRandomAccessReadDevice& d,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b,
+ asio::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,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition)
+{
+ asio::error_code ec;
+ std::size_t bytes_transferred = read_at(d, offset, b,
+ ASIO_MOVE_CAST(CompletionCondition)(completion_condition), ec);
+ asio::detail::throw_error(ec, "read_at");
+ return bytes_transferred;
+}
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+#endif // !defined(ASIO_NO_EXTENSIONS)
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_op
+ : public base_from_cancellation_state<ReadHandler>,
+ base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_op(AsyncRandomAccessReadDevice& device,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition& completion_condition, ReadHandler& handler)
+ : base_from_cancellation_state<ReadHandler>(
+ handler, enable_partial_cancellation()),
+ base_from_completion_cond<CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ buffers_(buffers),
+ start_(0),
+ handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ read_at_op(const read_at_op& other)
+ : base_from_cancellation_state<ReadHandler>(other),
+ base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(other.buffers_),
+ start_(other.start_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_op(read_at_op&& other)
+ : base_from_cancellation_state<ReadHandler>(
+ ASIO_MOVE_CAST(base_from_cancellation_state<
+ ReadHandler>)(other)),
+ base_from_completion_cond<CompletionCondition>(
+ ASIO_MOVE_CAST(base_from_completion_cond<
+ CompletionCondition>)(other)),
+ device_(other.device_),
+ offset_(other.offset_),
+ buffers_(ASIO_MOVE_CAST(buffers_type)(other.buffers_)),
+ start_(other.start_),
+ handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ void operator()(asio::error_code ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ std::size_t max_size;
+ switch (start_ = start)
+ {
+ case 1:
+ max_size = this->check_for_completion(ec, buffers_.total_consumed());
+ for (;;)
+ {
+ {
+ ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at"));
+ device_.async_read_some_at(
+ offset_ + buffers_.total_consumed(), buffers_.prepare(max_size),
+ ASIO_MOVE_CAST(read_at_op)(*this));
+ }
+ return; default:
+ buffers_.consume(bytes_transferred);
+ if ((!ec && bytes_transferred == 0) || buffers_.empty())
+ break;
+ max_size = this->check_for_completion(ec, buffers_.total_consumed());
+ if (max_size == 0)
+ break;
+ if (this->cancelled() != cancellation_type::none)
+ {
+ ec = asio::error::operation_aborted;
+ break;
+ }
+ }
+
+ ASIO_MOVE_OR_LVALUE(ReadHandler)(handler_)(
+ static_cast<const asio::error_code&>(ec),
+ static_cast<const std::size_t&>(buffers_.total_consumed()));
+ }
+ }
+
+ //private:
+ typedef asio::detail::consuming_buffers<mutable_buffer,
+ MutableBufferSequence, MutableBufferIterator> buffers_type;
+
+ AsyncRandomAccessReadDevice& device_;
+ uint64_t offset_;
+ buffers_type buffers_;
+ int start_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_allocate_is_deprecated
+ asio_handler_allocate(std::size_t size,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
+ {
+#if defined(ASIO_NO_DEPRECATED)
+ asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
+ return asio_handler_allocate_is_no_longer_used();
+#else // defined(ASIO_NO_DEPRECATED)
+ return asio_handler_alloc_helpers::allocate(
+ size, this_handler->handler_);
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_deallocate_is_deprecated
+ asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_alloc_helpers::deallocate(
+ pointer, size, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_deallocate_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline bool asio_handler_is_continuation(
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
+ {
+ return this_handler->start_ == 0 ? true
+ : asio_handler_cont_helpers::is_continuation(
+ this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_invoke_is_deprecated
+ asio_handler_invoke(Function& function,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_invoke_is_deprecated
+ asio_handler_invoke(const Function& function,
+ read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename MutableBufferIterator,
+ typename CompletionCondition, typename ReadHandler>
+ inline void start_read_at_buffer_sequence_op(AsyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ const MutableBufferIterator&, CompletionCondition& completion_condition,
+ ReadHandler& handler)
+ {
+ detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>(
+ d, offset, buffers, completion_condition, handler)(
+ asio::error_code(), 0, 1);
+ }
+
+ template <typename AsyncRandomAccessReadDevice>
+ class initiate_async_read_at_buffer_sequence
+ {
+ public:
+ typedef typename AsyncRandomAccessReadDevice::executor_type executor_type;
+
+ explicit initiate_async_read_at_buffer_sequence(
+ AsyncRandomAccessReadDevice& device)
+ : device_(device)
+ {
+ }
+
+ executor_type get_executor() const ASIO_NOEXCEPT
+ {
+ return device_.get_executor();
+ }
+
+ template <typename ReadHandler, typename MutableBufferSequence,
+ typename CompletionCondition>
+ void operator()(ASIO_MOVE_ARG(ReadHandler) handler,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ ASIO_MOVE_ARG(CompletionCondition) completion_cond) const
+ {
+ // If you get an error on the following line it means that your handler
+ // does not meet the documented type requirements for a ReadHandler.
+ ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ non_const_lvalue<ReadHandler> handler2(handler);
+ non_const_lvalue<CompletionCondition> completion_cond2(completion_cond);
+ start_read_at_buffer_sequence_op(device_, offset, buffers,
+ asio::buffer_sequence_begin(buffers),
+ completion_cond2.value, handler2.value);
+ }
+
+ private:
+ AsyncRandomAccessReadDevice& device_;
+ };
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <template <typename, typename> class Associator,
+ typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ typename MutableBufferIterator, typename CompletionCondition,
+ typename ReadHandler, typename DefaultCandidate>
+struct associator<Associator,
+ detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
+ MutableBufferIterator, CompletionCondition, ReadHandler>,
+ DefaultCandidate>
+ : Associator<ReadHandler, DefaultCandidate>
+{
+ static typename Associator<ReadHandler, DefaultCandidate>::type get(
+ const detail::read_at_op<AsyncRandomAccessReadDevice,
+ MutableBufferSequence, MutableBufferIterator,
+ CompletionCondition, ReadHandler>& h,
+ const DefaultCandidate& c = DefaultCandidate()) ASIO_NOEXCEPT
+ {
+ return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
+ }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncRandomAccessReadDevice,
+ typename MutableBufferSequence, typename CompletionCondition,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+async_read_at(AsyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ CompletionCondition completion_condition,
+ ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ return async_initiate<ReadHandler,
+ void (asio::error_code, std::size_t)>(
+ detail::initiate_async_read_at_buffer_sequence<
+ AsyncRandomAccessReadDevice>(d),
+ handler, offset, buffers,
+ ASIO_MOVE_CAST(CompletionCondition)(completion_condition));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+async_read_at(AsyncRandomAccessReadDevice& d,
+ uint64_t offset, const MutableBufferSequence& buffers,
+ ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ return async_initiate<ReadHandler,
+ void (asio::error_code, std::size_t)>(
+ detail::initiate_async_read_at_buffer_sequence<
+ AsyncRandomAccessReadDevice>(d),
+ handler, offset, buffers, transfer_all());
+}
+
+#if !defined(ASIO_NO_EXTENSIONS)
+#if !defined(ASIO_NO_IOSTREAM)
+
+namespace detail
+{
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ class read_at_streambuf_op
+ : public base_from_cancellation_state<ReadHandler>,
+ base_from_completion_cond<CompletionCondition>
+ {
+ public:
+ read_at_streambuf_op(AsyncRandomAccessReadDevice& device,
+ uint64_t offset, basic_streambuf<Allocator>& streambuf,
+ CompletionCondition& completion_condition, ReadHandler& handler)
+ : base_from_cancellation_state<ReadHandler>(
+ handler, enable_partial_cancellation()),
+ base_from_completion_cond<CompletionCondition>(completion_condition),
+ device_(device),
+ offset_(offset),
+ streambuf_(streambuf),
+ start_(0),
+ total_transferred_(0),
+ handler_(ASIO_MOVE_CAST(ReadHandler)(handler))
+ {
+ }
+
+#if defined(ASIO_HAS_MOVE)
+ read_at_streambuf_op(const read_at_streambuf_op& other)
+ : base_from_cancellation_state<ReadHandler>(other),
+ base_from_completion_cond<CompletionCondition>(other),
+ device_(other.device_),
+ offset_(other.offset_),
+ streambuf_(other.streambuf_),
+ start_(other.start_),
+ total_transferred_(other.total_transferred_),
+ handler_(other.handler_)
+ {
+ }
+
+ read_at_streambuf_op(read_at_streambuf_op&& other)
+ : base_from_cancellation_state<ReadHandler>(
+ ASIO_MOVE_CAST(base_from_cancellation_state<
+ ReadHandler>)(other)),
+ base_from_completion_cond<CompletionCondition>(
+ ASIO_MOVE_CAST(base_from_completion_cond<
+ CompletionCondition>)(other)),
+ device_(other.device_),
+ offset_(other.offset_),
+ streambuf_(other.streambuf_),
+ start_(other.start_),
+ total_transferred_(other.total_transferred_),
+ handler_(ASIO_MOVE_CAST(ReadHandler)(other.handler_))
+ {
+ }
+#endif // defined(ASIO_HAS_MOVE)
+
+ void operator()(asio::error_code ec,
+ std::size_t bytes_transferred, int start = 0)
+ {
+ std::size_t max_size, bytes_available;
+ switch (start_ = start)
+ {
+ case 1:
+ max_size = this->check_for_completion(ec, total_transferred_);
+ bytes_available = read_size_helper(streambuf_, max_size);
+ for (;;)
+ {
+ {
+ ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at"));
+ device_.async_read_some_at(offset_ + total_transferred_,
+ streambuf_.prepare(bytes_available),
+ 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;
+ if (this->cancelled() != cancellation_type::none)
+ {
+ ec = asio::error::operation_aborted;
+ break;
+ }
+ }
+
+ ASIO_MOVE_OR_LVALUE(ReadHandler)(handler_)(
+ static_cast<const asio::error_code&>(ec),
+ static_cast<const std::size_t&>(total_transferred_));
+ }
+ }
+
+ //private:
+ AsyncRandomAccessReadDevice& device_;
+ uint64_t offset_;
+ asio::basic_streambuf<Allocator>& streambuf_;
+ int start_;
+ std::size_t total_transferred_;
+ ReadHandler handler_;
+ };
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_allocate_is_deprecated
+ asio_handler_allocate(std::size_t size,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+#if defined(ASIO_NO_DEPRECATED)
+ asio_handler_alloc_helpers::allocate(size, this_handler->handler_);
+ return asio_handler_allocate_is_no_longer_used();
+#else // defined(ASIO_NO_DEPRECATED)
+ return asio_handler_alloc_helpers::allocate(
+ size, this_handler->handler_);
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_deallocate_is_deprecated
+ asio_handler_deallocate(void* pointer, std::size_t size,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_alloc_helpers::deallocate(
+ pointer, size, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_deallocate_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ typename CompletionCondition, typename ReadHandler>
+ inline bool asio_handler_is_continuation(
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ return this_handler->start_ == 0 ? true
+ : asio_handler_cont_helpers::is_continuation(
+ this_handler->handler_);
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_invoke_is_deprecated
+ asio_handler_invoke(Function& function,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename Function, typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition, typename ReadHandler>
+ inline asio_handler_invoke_is_deprecated
+ asio_handler_invoke(const Function& function,
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, ReadHandler>* this_handler)
+ {
+ asio_handler_invoke_helpers::invoke(
+ function, this_handler->handler_);
+#if defined(ASIO_NO_DEPRECATED)
+ return asio_handler_invoke_is_no_longer_used();
+#endif // defined(ASIO_NO_DEPRECATED)
+ }
+
+ template <typename AsyncRandomAccessReadDevice>
+ class initiate_async_read_at_streambuf
+ {
+ public:
+ typedef typename AsyncRandomAccessReadDevice::executor_type executor_type;
+
+ explicit initiate_async_read_at_streambuf(
+ AsyncRandomAccessReadDevice& device)
+ : device_(device)
+ {
+ }
+
+ executor_type get_executor() const ASIO_NOEXCEPT
+ {
+ return device_.get_executor();
+ }
+
+ template <typename ReadHandler,
+ typename Allocator, typename CompletionCondition>
+ void operator()(ASIO_MOVE_ARG(ReadHandler) handler,
+ uint64_t offset, basic_streambuf<Allocator>* b,
+ ASIO_MOVE_ARG(CompletionCondition) completion_cond) const
+ {
+ // If you get an error on the following line it means that your handler
+ // does not meet the documented type requirements for a ReadHandler.
+ ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+ non_const_lvalue<ReadHandler> handler2(handler);
+ non_const_lvalue<CompletionCondition> completion_cond2(completion_cond);
+ read_at_streambuf_op<AsyncRandomAccessReadDevice, Allocator,
+ CompletionCondition, typename decay<ReadHandler>::type>(
+ device_, offset, *b, completion_cond2.value, handler2.value)(
+ asio::error_code(), 0, 1);
+ }
+
+ private:
+ AsyncRandomAccessReadDevice& device_;
+ };
+} // namespace detail
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+template <template <typename, typename> class Associator,
+ typename AsyncRandomAccessReadDevice, typename Executor,
+ typename CompletionCondition, typename ReadHandler,
+ typename DefaultCandidate>
+struct associator<Associator,
+ detail::read_at_streambuf_op<AsyncRandomAccessReadDevice,
+ Executor, CompletionCondition, ReadHandler>,
+ DefaultCandidate>
+ : Associator<ReadHandler, DefaultCandidate>
+{
+ static typename Associator<ReadHandler, DefaultCandidate>::type get(
+ const detail::read_at_streambuf_op<AsyncRandomAccessReadDevice,
+ Executor, CompletionCondition, ReadHandler>& h,
+ const DefaultCandidate& c = DefaultCandidate()) ASIO_NOEXCEPT
+ {
+ return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
+ }
+};
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+template <typename AsyncRandomAccessReadDevice,
+ typename Allocator, typename CompletionCondition,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+async_read_at(AsyncRandomAccessReadDevice& d,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b,
+ CompletionCondition completion_condition,
+ ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ return async_initiate<ReadHandler,
+ void (asio::error_code, std::size_t)>(
+ detail::initiate_async_read_at_streambuf<AsyncRandomAccessReadDevice>(d),
+ handler, offset, &b,
+ ASIO_MOVE_CAST(CompletionCondition)(completion_condition));
+}
+
+template <typename AsyncRandomAccessReadDevice, typename Allocator,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler>
+inline ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+async_read_at(AsyncRandomAccessReadDevice& d,
+ uint64_t offset, asio::basic_streambuf<Allocator>& b,
+ ASIO_MOVE_ARG(ReadHandler) handler)
+{
+ return async_initiate<ReadHandler,
+ void (asio::error_code, std::size_t)>(
+ detail::initiate_async_read_at_streambuf<AsyncRandomAccessReadDevice>(d),
+ handler, offset, &b, transfer_all());
+}
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+#endif // !defined(ASIO_NO_EXTENSIONS)
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_READ_AT_HPP