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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-13 10:29:39 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-13 10:29:39 +0200
commita5c50a4f262f0a880734623f79d4dc2f1aa8a0a2 (patch)
tree1772ef47d98a68245c3d04d95637e5b9c1040904 /lib/asio/basic_streambuf.hpp
parent69aba72f0883c5effb5c3c2991d0c5257deb7409 (diff)
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Pull in files from odr-mmbtools-common
Replace ASIO by simpler implementation, meaning that the telnet RC now only supports a single connection. Move Log, RC to lib/
Diffstat (limited to 'lib/asio/basic_streambuf.hpp')
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diff --git a/lib/asio/basic_streambuf.hpp b/lib/asio/basic_streambuf.hpp
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-//
-// basic_streambuf.hpp
-// ~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_BASIC_STREAMBUF_HPP
-#define ASIO_BASIC_STREAMBUF_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#if !defined(ASIO_NO_IOSTREAM)
-
-#include <algorithm>
-#include <cstring>
-#include <stdexcept>
-#include <streambuf>
-#include <vector>
-#include "asio/basic_streambuf_fwd.hpp"
-#include "asio/buffer.hpp"
-#include "asio/detail/limits.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/throw_exception.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Automatically resizable buffer class based on std::streambuf.
-/**
- * The @c basic_streambuf class is derived from @c std::streambuf to associate
- * the streambuf's input and output sequences with one or more character
- * arrays. These character arrays are internal to the @c basic_streambuf
- * object, but direct access to the array elements is provided to permit them
- * to be used efficiently with I/O operations. Characters written to the output
- * sequence of a @c basic_streambuf object are appended to the input sequence
- * of the same object.
- *
- * The @c basic_streambuf class's public interface is intended to permit the
- * following implementation strategies:
- *
- * @li A single contiguous character array, which is reallocated as necessary
- * to accommodate changes in the size of the character sequence. This is the
- * implementation approach currently used in Asio.
- *
- * @li A sequence of one or more character arrays, where each array is of the
- * same size. Additional character array objects are appended to the sequence
- * to accommodate changes in the size of the character sequence.
- *
- * @li A sequence of one or more character arrays of varying sizes. Additional
- * character array objects are appended to the sequence to accommodate changes
- * in the size of the character sequence.
- *
- * The constructor for basic_streambuf accepts a @c size_t argument specifying
- * the maximum of the sum of the sizes of the input sequence and output
- * sequence. During the lifetime of the @c basic_streambuf object, the following
- * invariant holds:
- * @code size() <= max_size()@endcode
- * Any member function that would, if successful, cause the invariant to be
- * violated shall throw an exception of class @c std::length_error.
- *
- * The constructor for @c basic_streambuf takes an Allocator argument. A copy
- * of this argument is used for any memory allocation performed, by the
- * constructor and by all member functions, during the lifetime of each @c
- * basic_streambuf object.
- *
- * @par Examples
- * Writing directly from an streambuf to a socket:
- * @code
- * asio::streambuf b;
- * std::ostream os(&b);
- * os << "Hello, World!\n";
- *
- * // try sending some data in input sequence
- * size_t n = sock.send(b.data());
- *
- * b.consume(n); // sent data is removed from input sequence
- * @endcode
- *
- * Reading from a socket directly into a streambuf:
- * @code
- * asio::streambuf b;
- *
- * // reserve 512 bytes in output sequence
- * asio::streambuf::mutable_buffers_type bufs = b.prepare(512);
- *
- * size_t n = sock.receive(bufs);
- *
- * // received data is "committed" from output sequence to input sequence
- * b.commit(n);
- *
- * std::istream is(&b);
- * std::string s;
- * is >> s;
- * @endcode
- */
-#if defined(GENERATING_DOCUMENTATION)
-template <typename Allocator = std::allocator<char> >
-#else
-template <typename Allocator>
-#endif
-class basic_streambuf
- : public std::streambuf,
- private noncopyable
-{
-public:
-#if defined(GENERATING_DOCUMENTATION)
- /// The type used to represent the input sequence as a list of buffers.
- typedef implementation_defined const_buffers_type;
-
- /// The type used to represent the output sequence as a list of buffers.
- typedef implementation_defined mutable_buffers_type;
-#else
- typedef ASIO_CONST_BUFFER const_buffers_type;
- typedef ASIO_MUTABLE_BUFFER mutable_buffers_type;
-#endif
-
- /// Construct a basic_streambuf object.
- /**
- * Constructs a streambuf with the specified maximum size. The initial size
- * of the streambuf's input sequence is 0.
- */
- explicit basic_streambuf(
- std::size_t maximum_size = (std::numeric_limits<std::size_t>::max)(),
- const Allocator& allocator = Allocator())
- : max_size_(maximum_size),
- buffer_(allocator)
- {
- std::size_t pend = (std::min<std::size_t>)(max_size_, buffer_delta);
- buffer_.resize((std::max<std::size_t>)(pend, 1));
- setg(&buffer_[0], &buffer_[0], &buffer_[0]);
- setp(&buffer_[0], &buffer_[0] + pend);
- }
-
- /// Get the size of the input sequence.
- /**
- * @returns The size of the input sequence. The value is equal to that
- * calculated for @c s in the following code:
- * @code
- * size_t s = 0;
- * const_buffers_type bufs = data();
- * const_buffers_type::const_iterator i = bufs.begin();
- * while (i != bufs.end())
- * {
- * const_buffer buf(*i++);
- * s += buf.size();
- * }
- * @endcode
- */
- std::size_t size() const ASIO_NOEXCEPT
- {
- return pptr() - gptr();
- }
-
- /// Get the maximum size of the basic_streambuf.
- /**
- * @returns The allowed maximum of the sum of the sizes of the input sequence
- * and output sequence.
- */
- std::size_t max_size() const ASIO_NOEXCEPT
- {
- return max_size_;
- }
-
- /// Get the current capacity of the basic_streambuf.
- /**
- * @returns The current total capacity of the streambuf, i.e. for both the
- * input sequence and output sequence.
- */
- std::size_t capacity() const ASIO_NOEXCEPT
- {
- return buffer_.capacity();
- }
-
- /// Get a list of buffers that represents the input sequence.
- /**
- * @returns An object of type @c const_buffers_type that satisfies
- * ConstBufferSequence requirements, representing all character arrays in the
- * input sequence.
- *
- * @note The returned object is invalidated by any @c basic_streambuf member
- * function that modifies the input sequence or output sequence.
- */
- const_buffers_type data() const ASIO_NOEXCEPT
- {
- return asio::buffer(asio::const_buffer(gptr(),
- (pptr() - gptr()) * sizeof(char_type)));
- }
-
- /// Get a list of buffers that represents the output sequence, with the given
- /// size.
- /**
- * Ensures that the output sequence can accommodate @c n characters,
- * reallocating character array objects as necessary.
- *
- * @returns An object of type @c mutable_buffers_type that satisfies
- * MutableBufferSequence requirements, representing character array objects
- * at the start of the output sequence such that the sum of the buffer sizes
- * is @c n.
- *
- * @throws std::length_error If <tt>size() + n > max_size()</tt>.
- *
- * @note The returned object is invalidated by any @c basic_streambuf member
- * function that modifies the input sequence or output sequence.
- */
- mutable_buffers_type prepare(std::size_t n)
- {
- reserve(n);
- return asio::buffer(asio::mutable_buffer(
- pptr(), n * sizeof(char_type)));
- }
-
- /// Move characters from the output sequence to the input sequence.
- /**
- * Appends @c n characters from the start of the output sequence to the input
- * sequence. The beginning of the output sequence is advanced by @c n
- * characters.
- *
- * Requires a preceding call <tt>prepare(x)</tt> where <tt>x >= n</tt>, and
- * no intervening operations that modify the input or output sequence.
- *
- * @note If @c n is greater than the size of the output sequence, the entire
- * output sequence is moved to the input sequence and no error is issued.
- */
- void commit(std::size_t n)
- {
- n = std::min<std::size_t>(n, epptr() - pptr());
- pbump(static_cast<int>(n));
- setg(eback(), gptr(), pptr());
- }
-
- /// Remove characters from the input sequence.
- /**
- * Removes @c n characters from the beginning of the input sequence.
- *
- * @note If @c n is greater than the size of the input sequence, the entire
- * input sequence is consumed and no error is issued.
- */
- void consume(std::size_t n)
- {
- if (egptr() < pptr())
- setg(&buffer_[0], gptr(), pptr());
- if (gptr() + n > pptr())
- n = pptr() - gptr();
- gbump(static_cast<int>(n));
- }
-
-protected:
- enum { buffer_delta = 128 };
-
- /// Override std::streambuf behaviour.
- /**
- * Behaves according to the specification of @c std::streambuf::underflow().
- */
- int_type underflow()
- {
- if (gptr() < pptr())
- {
- setg(&buffer_[0], gptr(), pptr());
- return traits_type::to_int_type(*gptr());
- }
- else
- {
- return traits_type::eof();
- }
- }
-
- /// Override std::streambuf behaviour.
- /**
- * Behaves according to the specification of @c std::streambuf::overflow(),
- * with the specialisation that @c std::length_error is thrown if appending
- * the character to the input sequence would require the condition
- * <tt>size() > max_size()</tt> to be true.
- */
- int_type overflow(int_type c)
- {
- if (!traits_type::eq_int_type(c, traits_type::eof()))
- {
- if (pptr() == epptr())
- {
- std::size_t buffer_size = pptr() - gptr();
- if (buffer_size < max_size_ && max_size_ - buffer_size < buffer_delta)
- {
- reserve(max_size_ - buffer_size);
- }
- else
- {
- reserve(buffer_delta);
- }
- }
-
- *pptr() = traits_type::to_char_type(c);
- pbump(1);
- return c;
- }
-
- return traits_type::not_eof(c);
- }
-
- void reserve(std::size_t n)
- {
- // Get current stream positions as offsets.
- std::size_t gnext = gptr() - &buffer_[0];
- std::size_t pnext = pptr() - &buffer_[0];
- std::size_t pend = epptr() - &buffer_[0];
-
- // Check if there is already enough space in the put area.
- if (n <= pend - pnext)
- {
- return;
- }
-
- // Shift existing contents of get area to start of buffer.
- if (gnext > 0)
- {
- pnext -= gnext;
- std::memmove(&buffer_[0], &buffer_[0] + gnext, pnext);
- }
-
- // Ensure buffer is large enough to hold at least the specified size.
- if (n > pend - pnext)
- {
- if (n <= max_size_ && pnext <= max_size_ - n)
- {
- pend = pnext + n;
- buffer_.resize((std::max<std::size_t>)(pend, 1));
- }
- else
- {
- std::length_error ex("asio::streambuf too long");
- asio::detail::throw_exception(ex);
- }
- }
-
- // Update stream positions.
- setg(&buffer_[0], &buffer_[0], &buffer_[0] + pnext);
- setp(&buffer_[0] + pnext, &buffer_[0] + pend);
- }
-
-private:
- std::size_t max_size_;
- std::vector<char_type, Allocator> buffer_;
-
- // Helper function to get the preferred size for reading data.
- friend std::size_t read_size_helper(
- basic_streambuf& sb, std::size_t max_size)
- {
- return std::min<std::size_t>(
- std::max<std::size_t>(512, sb.buffer_.capacity() - sb.size()),
- std::min<std::size_t>(max_size, sb.max_size() - sb.size()));
- }
-};
-
-/// Adapts basic_streambuf to the dynamic buffer sequence type requirements.
-#if defined(GENERATING_DOCUMENTATION)
-template <typename Allocator = std::allocator<char> >
-#else
-template <typename Allocator>
-#endif
-class basic_streambuf_ref
-{
-public:
- /// The type used to represent the input sequence as a list of buffers.
- typedef typename basic_streambuf<Allocator>::const_buffers_type
- const_buffers_type;
-
- /// The type used to represent the output sequence as a list of buffers.
- typedef typename basic_streambuf<Allocator>::mutable_buffers_type
- mutable_buffers_type;
-
- /// Construct a basic_streambuf_ref for the given basic_streambuf object.
- explicit basic_streambuf_ref(basic_streambuf<Allocator>& sb)
- : sb_(sb)
- {
- }
-
- /// Copy construct a basic_streambuf_ref.
- basic_streambuf_ref(const basic_streambuf_ref& other) ASIO_NOEXCEPT
- : sb_(other.sb_)
- {
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move construct a basic_streambuf_ref.
- basic_streambuf_ref(basic_streambuf_ref&& other) ASIO_NOEXCEPT
- : sb_(other.sb_)
- {
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Get the size of the input sequence.
- std::size_t size() const ASIO_NOEXCEPT
- {
- return sb_.size();
- }
-
- /// Get the maximum size of the dynamic buffer.
- std::size_t max_size() const ASIO_NOEXCEPT
- {
- return sb_.max_size();
- }
-
- /// Get the current capacity of the dynamic buffer.
- std::size_t capacity() const ASIO_NOEXCEPT
- {
- return sb_.capacity();
- }
-
- /// Get a list of buffers that represents the input sequence.
- const_buffers_type data() const ASIO_NOEXCEPT
- {
- return sb_.data();
- }
-
- /// Get a list of buffers that represents the output sequence, with the given
- /// size.
- mutable_buffers_type prepare(std::size_t n)
- {
- return sb_.prepare(n);
- }
-
- /// Move bytes from the output sequence to the input sequence.
- void commit(std::size_t n)
- {
- return sb_.commit(n);
- }
-
- /// Remove characters from the input sequence.
- void consume(std::size_t n)
- {
- return sb_.consume(n);
- }
-
-private:
- basic_streambuf<Allocator>& sb_;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // !defined(ASIO_NO_IOSTREAM)
-
-#endif // ASIO_BASIC_STREAMBUF_HPP