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+//
+// buffered_read_stream.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_BUFFERED_READ_STREAM_HPP
+#define ASIO_BUFFERED_READ_STREAM_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <cstddef>
+#include "asio/async_result.hpp"
+#include "asio/buffered_read_stream_fwd.hpp"
+#include "asio/buffer.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_resize_guard.hpp"
+#include "asio/detail/buffered_stream_storage.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Adds buffering to the read-related operations of a stream.
+/**
+ * The buffered_read_stream class template can be used to add buffering to the
+ * synchronous and asynchronous read operations of a stream.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ *
+ * @par Concepts:
+ * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
+ */
+template <typename Stream>
+class buffered_read_stream
+ : private noncopyable
+{
+public:
+ /// The type of the next layer.
+ typedef typename remove_reference<Stream>::type next_layer_type;
+
+ /// The type of the lowest layer.
+ typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
+
+ /// The type of the executor associated with the object.
+ typedef typename lowest_layer_type::executor_type executor_type;
+
+#if defined(GENERATING_DOCUMENTATION)
+ /// The default buffer size.
+ static const std::size_t default_buffer_size = implementation_defined;
+#else
+ ASIO_STATIC_CONSTANT(std::size_t, default_buffer_size = 1024);
+#endif
+
+ /// Construct, passing the specified argument to initialise the next layer.
+ template <typename Arg>
+ explicit buffered_read_stream(Arg& a)
+ : next_layer_(a),
+ storage_(default_buffer_size)
+ {
+ }
+
+ /// Construct, passing the specified argument to initialise the next layer.
+ template <typename Arg>
+ buffered_read_stream(Arg& a, std::size_t buffer_size)
+ : next_layer_(a),
+ storage_(buffer_size)
+ {
+ }
+
+ /// Get a reference to the next layer.
+ next_layer_type& next_layer()
+ {
+ return next_layer_;
+ }
+
+ /// Get a reference to the lowest layer.
+ lowest_layer_type& lowest_layer()
+ {
+ return next_layer_.lowest_layer();
+ }
+
+ /// Get a const reference to the lowest layer.
+ const lowest_layer_type& lowest_layer() const
+ {
+ return next_layer_.lowest_layer();
+ }
+
+ /// Get the executor associated with the object.
+ executor_type get_executor() ASIO_NOEXCEPT
+ {
+ return next_layer_.lowest_layer().get_executor();
+ }
+
+ /// Close the stream.
+ void close()
+ {
+ next_layer_.close();
+ }
+
+ /// Close the stream.
+ ASIO_SYNC_OP_VOID close(asio::error_code& ec)
+ {
+ next_layer_.close(ec);
+ ASIO_SYNC_OP_VOID_RETURN(ec);
+ }
+
+ /// Write the given data to the stream. Returns the number of bytes written.
+ /// Throws an exception on failure.
+ template <typename ConstBufferSequence>
+ std::size_t write_some(const ConstBufferSequence& buffers)
+ {
+ return next_layer_.write_some(buffers);
+ }
+
+ /// Write the given data to the stream. Returns the number of bytes written,
+ /// or 0 if an error occurred.
+ template <typename ConstBufferSequence>
+ std::size_t write_some(const ConstBufferSequence& buffers,
+ asio::error_code& ec)
+ {
+ return next_layer_.write_some(buffers, ec);
+ }
+
+ /// Start an asynchronous write. The data being written must be valid for the
+ /// lifetime of the asynchronous operation.
+ template <typename ConstBufferSequence,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) WriteHandler
+ ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+ ASIO_INITFN_AUTO_RESULT_TYPE(WriteHandler,
+ void (asio::error_code, std::size_t))
+ async_write_some(const ConstBufferSequence& buffers,
+ ASIO_MOVE_ARG(WriteHandler) handler
+ ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+ {
+ return next_layer_.async_write_some(buffers,
+ ASIO_MOVE_CAST(WriteHandler)(handler));
+ }
+
+ /// Fill the buffer with some data. Returns the number of bytes placed in the
+ /// buffer as a result of the operation. Throws an exception on failure.
+ std::size_t fill();
+
+ /// Fill the buffer with some data. Returns the number of bytes placed in the
+ /// buffer as a result of the operation, or 0 if an error occurred.
+ std::size_t fill(asio::error_code& ec);
+
+ /// Start an asynchronous fill.
+ template <
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler
+ ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+ ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+ async_fill(
+ ASIO_MOVE_ARG(ReadHandler) handler
+ ASIO_DEFAULT_COMPLETION_TOKEN(executor_type));
+
+ /// Read some data from the stream. Returns the number of bytes read. Throws
+ /// an exception on failure.
+ template <typename MutableBufferSequence>
+ std::size_t read_some(const MutableBufferSequence& buffers);
+
+ /// Read some data from the stream. Returns the number of bytes read or 0 if
+ /// an error occurred.
+ template <typename MutableBufferSequence>
+ std::size_t read_some(const MutableBufferSequence& buffers,
+ asio::error_code& ec);
+
+ /// Start an asynchronous read. The buffer into which the data will be read
+ /// must be valid for the lifetime of the asynchronous operation.
+ template <typename MutableBufferSequence,
+ ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
+ std::size_t)) ReadHandler
+ ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+ ASIO_INITFN_AUTO_RESULT_TYPE(ReadHandler,
+ void (asio::error_code, std::size_t))
+ async_read_some(const MutableBufferSequence& buffers,
+ ASIO_MOVE_ARG(ReadHandler) handler
+ ASIO_DEFAULT_COMPLETION_TOKEN(executor_type));
+
+ /// Peek at the incoming data on the stream. Returns the number of bytes read.
+ /// Throws an exception on failure.
+ template <typename MutableBufferSequence>
+ std::size_t peek(const MutableBufferSequence& buffers);
+
+ /// Peek at the incoming data on the stream. Returns the number of bytes read,
+ /// or 0 if an error occurred.
+ template <typename MutableBufferSequence>
+ std::size_t peek(const MutableBufferSequence& buffers,
+ asio::error_code& ec);
+
+ /// Determine the amount of data that may be read without blocking.
+ std::size_t in_avail()
+ {
+ return storage_.size();
+ }
+
+ /// Determine the amount of data that may be read without blocking.
+ std::size_t in_avail(asio::error_code& ec)
+ {
+ ec = asio::error_code();
+ return storage_.size();
+ }
+
+private:
+ /// Copy data out of the internal buffer to the specified target buffer.
+ /// Returns the number of bytes copied.
+ template <typename MutableBufferSequence>
+ std::size_t copy(const MutableBufferSequence& buffers)
+ {
+ std::size_t bytes_copied = asio::buffer_copy(
+ buffers, storage_.data(), storage_.size());
+ storage_.consume(bytes_copied);
+ return bytes_copied;
+ }
+
+ /// Copy data from the internal buffer to the specified target buffer, without
+ /// removing the data from the internal buffer. Returns the number of bytes
+ /// copied.
+ template <typename MutableBufferSequence>
+ std::size_t peek_copy(const MutableBufferSequence& buffers)
+ {
+ return asio::buffer_copy(buffers, storage_.data(), storage_.size());
+ }
+
+ /// The next layer.
+ Stream next_layer_;
+
+ // The data in the buffer.
+ detail::buffered_stream_storage storage_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/buffered_read_stream.hpp"
+
+#endif // ASIO_BUFFERED_READ_STREAM_HPP