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include/asio/impl/read_at.hpp
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562
include/asio/impl/read_at.hpp
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//
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// impl/read_at.hpp
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// ~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_IMPL_READ_AT_HPP
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#define ASIO_IMPL_READ_AT_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <algorithm>
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#include "asio/associator.hpp"
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#include "asio/buffer.hpp"
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#include "asio/detail/array_fwd.hpp"
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#include "asio/detail/base_from_cancellation_state.hpp"
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#include "asio/detail/base_from_completion_cond.hpp"
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#include "asio/detail/bind_handler.hpp"
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#include "asio/detail/consuming_buffers.hpp"
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#include "asio/detail/dependent_type.hpp"
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#include "asio/detail/handler_cont_helpers.hpp"
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#include "asio/detail/handler_tracking.hpp"
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#include "asio/detail/handler_type_requirements.hpp"
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#include "asio/detail/non_const_lvalue.hpp"
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#include "asio/detail/throw_error.hpp"
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#include "asio/error.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail
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{
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template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
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typename MutableBufferIterator, typename CompletionCondition>
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std::size_t read_at_buffer_sequence(SyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers,
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const MutableBufferIterator&, CompletionCondition completion_condition,
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asio::error_code& ec)
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{
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ec = asio::error_code();
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asio::detail::consuming_buffers<mutable_buffer,
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MutableBufferSequence, MutableBufferIterator> tmp(buffers);
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while (!tmp.empty())
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{
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if (std::size_t max_size = detail::adapt_completion_condition_result(
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completion_condition(ec, tmp.total_consumed())))
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{
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tmp.consume(d.read_some_at(offset + tmp.total_consumed(),
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tmp.prepare(max_size), ec));
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}
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else
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break;
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}
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return tmp.total_consumed();
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}
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} // namespace detail
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template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
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typename CompletionCondition>
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std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers,
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CompletionCondition completion_condition, asio::error_code& ec,
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constraint_t<
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is_completion_condition<CompletionCondition>::value
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>)
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{
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return detail::read_at_buffer_sequence(d, offset, buffers,
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asio::buffer_sequence_begin(buffers),
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static_cast<CompletionCondition&&>(completion_condition), ec);
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}
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template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_at(
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d, offset, buffers, transfer_all(), ec);
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asio::detail::throw_error(ec, "read_at");
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return bytes_transferred;
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}
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template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers,
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asio::error_code& ec)
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{
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return read_at(d, offset, buffers, transfer_all(), ec);
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}
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template <typename SyncRandomAccessReadDevice, typename MutableBufferSequence,
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typename CompletionCondition>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers,
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CompletionCondition completion_condition,
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constraint_t<
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is_completion_condition<CompletionCondition>::value
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>)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_at(d, offset, buffers,
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static_cast<CompletionCondition&&>(completion_condition), ec);
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asio::detail::throw_error(ec, "read_at");
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return bytes_transferred;
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}
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#if !defined(ASIO_NO_EXTENSIONS)
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#if !defined(ASIO_NO_IOSTREAM)
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template <typename SyncRandomAccessReadDevice, typename Allocator,
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typename CompletionCondition>
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std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, asio::basic_streambuf<Allocator>& b,
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CompletionCondition completion_condition, asio::error_code& ec,
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constraint_t<
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is_completion_condition<CompletionCondition>::value
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>)
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{
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ec = asio::error_code();
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std::size_t total_transferred = 0;
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std::size_t max_size = detail::adapt_completion_condition_result(
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completion_condition(ec, total_transferred));
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std::size_t bytes_available = read_size_helper(b, max_size);
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while (bytes_available > 0)
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{
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std::size_t bytes_transferred = d.read_some_at(
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offset + total_transferred, b.prepare(bytes_available), ec);
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b.commit(bytes_transferred);
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total_transferred += bytes_transferred;
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max_size = detail::adapt_completion_condition_result(
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completion_condition(ec, total_transferred));
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bytes_available = read_size_helper(b, max_size);
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}
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return total_transferred;
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}
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template <typename SyncRandomAccessReadDevice, typename Allocator>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, asio::basic_streambuf<Allocator>& b)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_at(
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d, offset, b, transfer_all(), ec);
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asio::detail::throw_error(ec, "read_at");
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return bytes_transferred;
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}
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template <typename SyncRandomAccessReadDevice, typename Allocator>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, asio::basic_streambuf<Allocator>& b,
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asio::error_code& ec)
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{
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return read_at(d, offset, b, transfer_all(), ec);
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}
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template <typename SyncRandomAccessReadDevice, typename Allocator,
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typename CompletionCondition>
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inline std::size_t read_at(SyncRandomAccessReadDevice& d,
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uint64_t offset, asio::basic_streambuf<Allocator>& b,
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CompletionCondition completion_condition,
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constraint_t<
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is_completion_condition<CompletionCondition>::value
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>)
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{
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asio::error_code ec;
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std::size_t bytes_transferred = read_at(d, offset, b,
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static_cast<CompletionCondition&&>(completion_condition), ec);
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asio::detail::throw_error(ec, "read_at");
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return bytes_transferred;
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}
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#endif // !defined(ASIO_NO_IOSTREAM)
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#endif // !defined(ASIO_NO_EXTENSIONS)
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namespace detail
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{
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template <typename AsyncRandomAccessReadDevice,
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typename MutableBufferSequence, typename MutableBufferIterator,
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typename CompletionCondition, typename ReadHandler>
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class read_at_op
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: public base_from_cancellation_state<ReadHandler>,
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base_from_completion_cond<CompletionCondition>
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{
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public:
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read_at_op(AsyncRandomAccessReadDevice& device,
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uint64_t offset, const MutableBufferSequence& buffers,
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CompletionCondition& completion_condition, ReadHandler& handler)
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: base_from_cancellation_state<ReadHandler>(
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handler, enable_partial_cancellation()),
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base_from_completion_cond<CompletionCondition>(completion_condition),
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device_(device),
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offset_(offset),
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buffers_(buffers),
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start_(0),
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handler_(static_cast<ReadHandler&&>(handler))
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{
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}
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read_at_op(const read_at_op& other)
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: base_from_cancellation_state<ReadHandler>(other),
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base_from_completion_cond<CompletionCondition>(other),
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device_(other.device_),
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offset_(other.offset_),
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buffers_(other.buffers_),
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start_(other.start_),
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handler_(other.handler_)
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{
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}
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read_at_op(read_at_op&& other)
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: base_from_cancellation_state<ReadHandler>(
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static_cast<base_from_cancellation_state<ReadHandler>&&>(other)),
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base_from_completion_cond<CompletionCondition>(
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static_cast<base_from_completion_cond<CompletionCondition>&&>(other)),
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device_(other.device_),
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offset_(other.offset_),
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buffers_(static_cast<buffers_type&&>(other.buffers_)),
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start_(other.start_),
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handler_(static_cast<ReadHandler&&>(other.handler_))
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{
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}
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void operator()(asio::error_code ec,
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std::size_t bytes_transferred, int start = 0)
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{
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std::size_t max_size;
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switch (start_ = start)
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{
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case 1:
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max_size = this->check_for_completion(ec, buffers_.total_consumed());
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for (;;)
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{
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{
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ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at"));
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device_.async_read_some_at(
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offset_ + buffers_.total_consumed(), buffers_.prepare(max_size),
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static_cast<read_at_op&&>(*this));
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}
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return; default:
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buffers_.consume(bytes_transferred);
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if ((!ec && bytes_transferred == 0) || buffers_.empty())
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break;
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max_size = this->check_for_completion(ec, buffers_.total_consumed());
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if (max_size == 0)
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break;
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if (this->cancelled() != cancellation_type::none)
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{
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ec = asio::error::operation_aborted;
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break;
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}
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}
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static_cast<ReadHandler&&>(handler_)(
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static_cast<const asio::error_code&>(ec),
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static_cast<const std::size_t&>(buffers_.total_consumed()));
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}
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}
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//private:
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typedef asio::detail::consuming_buffers<mutable_buffer,
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MutableBufferSequence, MutableBufferIterator> buffers_type;
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AsyncRandomAccessReadDevice& device_;
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uint64_t offset_;
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buffers_type buffers_;
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int start_;
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ReadHandler handler_;
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};
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template <typename AsyncRandomAccessReadDevice,
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typename MutableBufferSequence, typename MutableBufferIterator,
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typename CompletionCondition, typename ReadHandler>
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inline bool asio_handler_is_continuation(
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read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
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MutableBufferIterator, CompletionCondition, ReadHandler>* this_handler)
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{
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return this_handler->start_ == 0 ? true
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: asio_handler_cont_helpers::is_continuation(
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this_handler->handler_);
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}
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template <typename AsyncRandomAccessReadDevice,
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typename MutableBufferSequence, typename MutableBufferIterator,
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typename CompletionCondition, typename ReadHandler>
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inline void start_read_at_op(AsyncRandomAccessReadDevice& d,
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uint64_t offset, const MutableBufferSequence& buffers,
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const MutableBufferIterator&, CompletionCondition& completion_condition,
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ReadHandler& handler)
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{
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detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
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MutableBufferIterator, CompletionCondition, ReadHandler>(
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d, offset, buffers, completion_condition, handler)(
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asio::error_code(), 0, 1);
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}
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template <typename AsyncRandomAccessReadDevice>
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class initiate_async_read_at
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{
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public:
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typedef typename AsyncRandomAccessReadDevice::executor_type executor_type;
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explicit initiate_async_read_at(AsyncRandomAccessReadDevice& device)
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: device_(device)
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{
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}
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executor_type get_executor() const noexcept
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{
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return device_.get_executor();
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}
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template <typename ReadHandler, typename MutableBufferSequence,
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typename CompletionCondition>
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void operator()(ReadHandler&& handler,
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uint64_t offset, const MutableBufferSequence& buffers,
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CompletionCondition&& completion_cond) const
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{
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// If you get an error on the following line it means that your handler
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// does not meet the documented type requirements for a ReadHandler.
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ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
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non_const_lvalue<ReadHandler> handler2(handler);
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non_const_lvalue<CompletionCondition> completion_cond2(completion_cond);
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start_read_at_op(device_, offset, buffers,
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asio::buffer_sequence_begin(buffers),
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completion_cond2.value, handler2.value);
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}
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private:
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AsyncRandomAccessReadDevice& device_;
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};
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} // namespace detail
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#if !defined(GENERATING_DOCUMENTATION)
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template <template <typename, typename> class Associator,
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typename AsyncRandomAccessReadDevice, typename MutableBufferSequence,
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typename MutableBufferIterator, typename CompletionCondition,
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typename ReadHandler, typename DefaultCandidate>
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struct associator<Associator,
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detail::read_at_op<AsyncRandomAccessReadDevice, MutableBufferSequence,
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MutableBufferIterator, CompletionCondition, ReadHandler>,
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DefaultCandidate>
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: Associator<ReadHandler, DefaultCandidate>
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{
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static typename Associator<ReadHandler, DefaultCandidate>::type get(
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const detail::read_at_op<AsyncRandomAccessReadDevice,
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MutableBufferSequence, MutableBufferIterator,
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CompletionCondition, ReadHandler>& h) noexcept
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{
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return Associator<ReadHandler, DefaultCandidate>::get(h.handler_);
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}
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static auto get(
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const detail::read_at_op<AsyncRandomAccessReadDevice,
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MutableBufferSequence, MutableBufferIterator,
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CompletionCondition, ReadHandler>& h,
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const DefaultCandidate& c) noexcept
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-> decltype(Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c))
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{
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return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
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}
|
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};
|
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|
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#endif // !defined(GENERATING_DOCUMENTATION)
|
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#if !defined(ASIO_NO_EXTENSIONS)
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#if !defined(ASIO_NO_IOSTREAM)
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namespace detail
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||||
{
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template <typename AsyncRandomAccessReadDevice, typename Allocator,
|
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typename CompletionCondition, typename ReadHandler>
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class read_at_streambuf_op
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: public base_from_cancellation_state<ReadHandler>,
|
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base_from_completion_cond<CompletionCondition>
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{
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public:
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read_at_streambuf_op(AsyncRandomAccessReadDevice& device,
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uint64_t offset, basic_streambuf<Allocator>& streambuf,
|
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CompletionCondition& completion_condition, ReadHandler& handler)
|
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: base_from_cancellation_state<ReadHandler>(
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handler, enable_partial_cancellation()),
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base_from_completion_cond<CompletionCondition>(completion_condition),
|
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device_(device),
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offset_(offset),
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streambuf_(streambuf),
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start_(0),
|
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total_transferred_(0),
|
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handler_(static_cast<ReadHandler&&>(handler))
|
||||
{
|
||||
}
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read_at_streambuf_op(const read_at_streambuf_op& other)
|
||||
: base_from_cancellation_state<ReadHandler>(other),
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base_from_completion_cond<CompletionCondition>(other),
|
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device_(other.device_),
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offset_(other.offset_),
|
||||
streambuf_(other.streambuf_),
|
||||
start_(other.start_),
|
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total_transferred_(other.total_transferred_),
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||||
handler_(other.handler_)
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{
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||||
}
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read_at_streambuf_op(read_at_streambuf_op&& other)
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||||
: base_from_cancellation_state<ReadHandler>(
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static_cast<base_from_cancellation_state<ReadHandler>&&>(other)),
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||||
base_from_completion_cond<CompletionCondition>(
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static_cast<base_from_completion_cond<CompletionCondition>&&>(other)),
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device_(other.device_),
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offset_(other.offset_),
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||||
streambuf_(other.streambuf_),
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start_(other.start_),
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total_transferred_(other.total_transferred_),
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handler_(static_cast<ReadHandler&&>(other.handler_))
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||||
{
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||||
}
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||||
|
||||
void operator()(asio::error_code ec,
|
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std::size_t bytes_transferred, int start = 0)
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||||
{
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||||
std::size_t max_size, bytes_available;
|
||||
switch (start_ = start)
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||||
{
|
||||
case 1:
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||||
max_size = this->check_for_completion(ec, total_transferred_);
|
||||
bytes_available = read_size_helper(streambuf_, max_size);
|
||||
for (;;)
|
||||
{
|
||||
{
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ASIO_HANDLER_LOCATION((__FILE__, __LINE__, "async_read_at"));
|
||||
device_.async_read_some_at(offset_ + total_transferred_,
|
||||
streambuf_.prepare(bytes_available),
|
||||
static_cast<read_at_streambuf_op&&>(*this));
|
||||
}
|
||||
return; default:
|
||||
total_transferred_ += bytes_transferred;
|
||||
streambuf_.commit(bytes_transferred);
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||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
static_cast<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 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 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 noexcept
|
||||
{
|
||||
return device_.get_executor();
|
||||
}
|
||||
|
||||
template <typename ReadHandler,
|
||||
typename Allocator, typename CompletionCondition>
|
||||
void operator()(ReadHandler&& handler,
|
||||
uint64_t offset, basic_streambuf<Allocator>* b,
|
||||
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, decay_t<ReadHandler>>(
|
||||
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) noexcept
|
||||
{
|
||||
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_);
|
||||
}
|
||||
|
||||
static auto get(
|
||||
const detail::read_at_streambuf_op<AsyncRandomAccessReadDevice,
|
||||
Executor, CompletionCondition, ReadHandler>& h,
|
||||
const DefaultCandidate& c) noexcept
|
||||
-> decltype(Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c))
|
||||
{
|
||||
return Associator<ReadHandler, DefaultCandidate>::get(h.handler_, c);
|
||||
}
|
||||
};
|
||||
|
||||
#endif // !defined(GENERATING_DOCUMENTATION)
|
||||
|
||||
#endif // !defined(ASIO_NO_IOSTREAM)
|
||||
#endif // !defined(ASIO_NO_EXTENSIONS)
|
||||
|
||||
} // namespace asio
|
||||
|
||||
#include "asio/detail/pop_options.hpp"
|
||||
|
||||
#endif // ASIO_IMPL_READ_AT_HPP
|
||||
Reference in New Issue
Block a user