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2114 lines
64 KiB
2114 lines
64 KiB
//
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// buffer.hpp
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// ~~~~~~~~~~
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//
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// Copyright (c) 2003-2016 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_BUFFER_HPP
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#define ASIO_BUFFER_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 "asio/detail/config.hpp"
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#include <cstddef>
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#include <cstring>
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#include <limits>
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#include <stdexcept>
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#include <string>
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#include <vector>
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#include "asio/detail/array_fwd.hpp"
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#include "asio/detail/is_buffer_sequence.hpp"
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#include "asio/detail/throw_exception.hpp"
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#include "asio/detail/type_traits.hpp"
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#if defined(ASIO_MSVC)
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# if defined(_HAS_ITERATOR_DEBUGGING) && (_HAS_ITERATOR_DEBUGGING != 0)
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# if !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
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# define ASIO_ENABLE_BUFFER_DEBUGGING
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# endif // !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
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# endif // defined(_HAS_ITERATOR_DEBUGGING)
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#endif // defined(ASIO_MSVC)
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#if defined(__GNUC__)
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# if defined(_GLIBCXX_DEBUG)
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# if !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
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# define ASIO_ENABLE_BUFFER_DEBUGGING
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# endif // !defined(ASIO_DISABLE_BUFFER_DEBUGGING)
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# endif // defined(_GLIBCXX_DEBUG)
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#endif // defined(__GNUC__)
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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# include "asio/detail/functional.hpp"
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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#if defined(ASIO_HAS_BOOST_WORKAROUND)
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# include <boost/detail/workaround.hpp>
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# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582)) \
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|| BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
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# define ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND
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# endif // BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582))
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// || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
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#endif // defined(ASIO_HAS_BOOST_WORKAROUND)
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#if defined(ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND)
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# include "asio/detail/type_traits.hpp"
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#endif // defined(ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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class mutable_buffer;
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class const_buffer;
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/// Holds a buffer that can be modified.
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/**
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* The mutable_buffer class provides a safe representation of a buffer that can
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* be modified. It does not own the underlying data, and so is cheap to copy or
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* assign.
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*
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* @par Accessing Buffer Contents
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*
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* The contents of a buffer may be accessed using the @c data() and @c size()
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* member functions:
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*
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* @code asio::mutable_buffer b1 = ...;
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* std::size_t s1 = b1.size();
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* unsigned char* p1 = static_cast<unsigned char*>(b1.data());
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* @endcode
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*
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* The @c data() member function permits violations of type safety, so uses of
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* it in application code should be carefully considered.
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*/
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class mutable_buffer
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{
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public:
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/// Construct an empty buffer.
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mutable_buffer() ASIO_NOEXCEPT
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: data_(0),
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size_(0)
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{
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}
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/// Construct a buffer to represent a given memory range.
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mutable_buffer(void* data, std::size_t size) ASIO_NOEXCEPT
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: data_(data),
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size_(size)
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{
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}
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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mutable_buffer(void* data, std::size_t size,
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asio::detail::function<void()> debug_check)
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: data_(data),
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size_(size),
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debug_check_(debug_check)
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{
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}
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const asio::detail::function<void()>& get_debug_check() const
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{
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return debug_check_;
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}
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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/// Get a pointer to the beginning of the memory range.
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void* data() const ASIO_NOEXCEPT
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{
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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if (size_ && debug_check_)
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debug_check_();
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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return data_;
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}
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/// Get the size of the memory range.
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std::size_t size() const ASIO_NOEXCEPT
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{
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return size_;
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}
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/// Move the start of the buffer by the specified number of bytes.
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mutable_buffer& operator+=(std::size_t n) ASIO_NOEXCEPT
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{
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std::size_t offset = n < size_ ? n : size_;
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data_ = static_cast<char*>(data_) + offset;
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size_ -= offset;
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return *this;
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}
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private:
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void* data_;
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std::size_t size_;
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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asio::detail::function<void()> debug_check_;
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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};
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#if !defined(ASIO_NO_DEPRECATED)
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/// (Deprecated: Use mutable_buffer.) Adapts a single modifiable buffer so that
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/// it meets the requirements of the MutableBufferSequence concept.
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class mutable_buffers_1
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: public mutable_buffer
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{
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public:
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/// The type for each element in the list of buffers.
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typedef mutable_buffer value_type;
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/// A random-access iterator type that may be used to read elements.
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typedef const mutable_buffer* const_iterator;
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/// Construct to represent a given memory range.
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mutable_buffers_1(void* data, std::size_t size) ASIO_NOEXCEPT
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: mutable_buffer(data, size)
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{
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}
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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mutable_buffers_1(void* data, std::size_t size,
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asio::detail::function<void()> debug_check)
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: mutable_buffer(data, size, debug_check)
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{
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}
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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/// Construct to represent a single modifiable buffer.
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explicit mutable_buffers_1(const mutable_buffer& b) ASIO_NOEXCEPT
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: mutable_buffer(b)
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{
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}
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/// Get a random-access iterator to the first element.
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const_iterator begin() const ASIO_NOEXCEPT
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{
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return this;
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}
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/// Get a random-access iterator for one past the last element.
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const_iterator end() const ASIO_NOEXCEPT
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{
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return begin() + 1;
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}
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};
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#endif // !defined(ASIO_NO_DEPRECATED)
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/// Holds a buffer that cannot be modified.
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/**
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* The const_buffer class provides a safe representation of a buffer that cannot
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* be modified. It does not own the underlying data, and so is cheap to copy or
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* assign.
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*
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* @par Accessing Buffer Contents
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*
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* The contents of a buffer may be accessed using the @c data() and @c size()
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* member functions:
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*
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* @code asio::const_buffer b1 = ...;
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* std::size_t s1 = b1.size();
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* const unsigned char* p1 = static_cast<const unsigned char*>(b1.data());
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* @endcode
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*
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* The @c data() member function permits violations of type safety, so uses of
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* it in application code should be carefully considered.
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*/
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class const_buffer
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{
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public:
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/// Construct an empty buffer.
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const_buffer() ASIO_NOEXCEPT
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: data_(0),
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size_(0)
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{
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}
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/// Construct a buffer to represent a given memory range.
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const_buffer(const void* data, std::size_t size) ASIO_NOEXCEPT
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: data_(data),
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size_(size)
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{
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}
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/// Construct a non-modifiable buffer from a modifiable one.
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const_buffer(const mutable_buffer& b) ASIO_NOEXCEPT
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: data_(b.data()),
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size_(b.size())
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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, debug_check_(b.get_debug_check())
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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{
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}
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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const_buffer(const void* data, std::size_t size,
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asio::detail::function<void()> debug_check)
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: data_(data),
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size_(size),
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debug_check_(debug_check)
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{
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}
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const asio::detail::function<void()>& get_debug_check() const
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{
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return debug_check_;
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}
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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/// Get a pointer to the beginning of the memory range.
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const void* data() const ASIO_NOEXCEPT
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{
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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if (size_ && debug_check_)
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debug_check_();
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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return data_;
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}
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/// Get the size of the memory range.
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std::size_t size() const ASIO_NOEXCEPT
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{
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return size_;
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}
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/// Move the start of the buffer by the specified number of bytes.
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const_buffer& operator+=(std::size_t n) ASIO_NOEXCEPT
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{
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std::size_t offset = n < size_ ? n : size_;
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data_ = static_cast<const char*>(data_) + offset;
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size_ -= offset;
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return *this;
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}
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private:
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const void* data_;
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std::size_t size_;
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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asio::detail::function<void()> debug_check_;
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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};
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#if !defined(ASIO_NO_DEPRECATED)
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/// (Deprecated: Use const_buffer.) Adapts a single non-modifiable buffer so
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/// that it meets the requirements of the ConstBufferSequence concept.
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class const_buffers_1
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: public const_buffer
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{
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public:
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/// The type for each element in the list of buffers.
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typedef const_buffer value_type;
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/// A random-access iterator type that may be used to read elements.
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typedef const const_buffer* const_iterator;
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/// Construct to represent a given memory range.
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const_buffers_1(const void* data, std::size_t size) ASIO_NOEXCEPT
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: const_buffer(data, size)
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{
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}
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#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
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const_buffers_1(const void* data, std::size_t size,
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asio::detail::function<void()> debug_check)
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: const_buffer(data, size, debug_check)
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{
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}
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#endif // ASIO_ENABLE_BUFFER_DEBUGGING
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/// Construct to represent a single non-modifiable buffer.
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explicit const_buffers_1(const const_buffer& b) ASIO_NOEXCEPT
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: const_buffer(b)
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{
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}
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/// Get a random-access iterator to the first element.
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const_iterator begin() const ASIO_NOEXCEPT
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{
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return this;
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}
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/// Get a random-access iterator for one past the last element.
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const_iterator end() const ASIO_NOEXCEPT
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{
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return begin() + 1;
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}
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};
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#endif // !defined(ASIO_NO_DEPRECATED)
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/// Trait to determine whether a type satisfies the MutableBufferSequence
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/// requirements.
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template <typename T>
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struct is_mutable_buffer_sequence
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#if defined(GENERATING_DOCUMENTATION)
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: integral_constant<bool, automatically_determined>
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#else // defined(GENERATING_DOCUMENTATION)
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: asio::detail::is_buffer_sequence<T, mutable_buffer>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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};
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/// Trait to determine whether a type satisfies the ConstBufferSequence
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/// requirements.
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template <typename T>
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struct is_const_buffer_sequence
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#if defined(GENERATING_DOCUMENTATION)
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: integral_constant<bool, automatically_determined>
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#else // defined(GENERATING_DOCUMENTATION)
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: asio::detail::is_buffer_sequence<T, const_buffer>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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};
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/// Trait to determine whether a type satisfies the DynamicBufferSequence
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/// requirements.
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template <typename T>
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struct is_dynamic_buffer_sequence
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#if defined(GENERATING_DOCUMENTATION)
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: integral_constant<bool, automatically_determined>
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#else // defined(GENERATING_DOCUMENTATION)
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: asio::detail::is_dynamic_buffer_sequence<T>
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#endif // defined(GENERATING_DOCUMENTATION)
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{
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};
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/// (Deprecated: Use the socket/descriptor wait() and async_wait() member
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/// functions.) An implementation of both the ConstBufferSequence and
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/// MutableBufferSequence concepts to represent a null buffer sequence.
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class null_buffers
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{
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public:
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/// The type for each element in the list of buffers.
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typedef mutable_buffer value_type;
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/// A random-access iterator type that may be used to read elements.
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typedef const mutable_buffer* const_iterator;
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/// Get a random-access iterator to the first element.
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const_iterator begin() const ASIO_NOEXCEPT
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{
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return &buf_;
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}
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/// Get a random-access iterator for one past the last element.
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const_iterator end() const ASIO_NOEXCEPT
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{
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return &buf_;
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}
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private:
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mutable_buffer buf_;
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};
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/** @defgroup buffer_sequence_begin asio::buffer_sequence_begin
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*
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* @brief The asio::buffer_sequence_begin function returns an iterator
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* pointing to the first element in a buffer sequence.
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*/
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/*@{*/
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/// Get an iterator to the first element in a buffer sequence.
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inline const mutable_buffer* buffer_sequence_begin(const mutable_buffer& b)
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{
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return &b;
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}
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/// Get an iterator to the first element in a buffer sequence.
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inline const const_buffer* buffer_sequence_begin(const const_buffer& b)
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{
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return &b;
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|
}
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#if defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
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/// Get an iterator to the first element in a buffer sequence.
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|
template <typename C>
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inline auto buffer_sequence_begin(C& c) -> decltype(c.begin())
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|
{
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|
return c.begin();
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|
}
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/// Get an iterator to the first element in a buffer sequence.
|
|
template <typename C>
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|
inline auto buffer_sequence_begin(const C& c) -> decltype(c.begin())
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|
{
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return c.begin();
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|
}
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#else // defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
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template <typename C>
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inline typename C::iterator buffer_sequence_begin(C& c)
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|
{
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|
return c.begin();
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|
}
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|
|
template <typename C>
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|
inline typename C::const_iterator buffer_sequence_begin(const C& c)
|
|
{
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|
return c.begin();
|
|
}
|
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|
#endif // defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
|
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|
|
/*@}*/
|
|
|
|
/** @defgroup buffer_sequence_end asio::buffer_sequence_end
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|
*
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|
* @brief The asio::buffer_sequence_end function returns an iterator
|
|
* pointing to one past the end element in a buffer sequence.
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|
*/
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|
/*@{*/
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|
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/// Get an iterator to one past the end element in a buffer sequence.
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|
inline const mutable_buffer* buffer_sequence_end(const mutable_buffer& b)
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|
{
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|
return &b + 1;
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|
}
|
|
|
|
/// Get an iterator to one past the end element in a buffer sequence.
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|
inline const const_buffer* buffer_sequence_end(const const_buffer& b)
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|
{
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|
return &b + 1;
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|
}
|
|
|
|
#if defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Get an iterator to one past the end element in a buffer sequence.
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|
template <typename C>
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|
inline auto buffer_sequence_end(C& c) -> decltype(c.end())
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|
{
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|
return c.end();
|
|
}
|
|
|
|
/// Get an iterator to one past the end element in a buffer sequence.
|
|
template <typename C>
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|
inline auto buffer_sequence_end(const C& c) -> decltype(c.end())
|
|
{
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|
return c.end();
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|
}
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|
|
#else // defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
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template <typename C>
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|
inline typename C::iterator buffer_sequence_end(C& c)
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|
{
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|
return c.end();
|
|
}
|
|
|
|
template <typename C>
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|
inline typename C::const_iterator buffer_sequence_end(const C& c)
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|
{
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|
return c.end();
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|
}
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|
|
#endif // defined(ASIO_HAS_DECLTYPE) || defined(GENERATING_DOCUMENTATION)
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|
|
/*@}*/
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|
|
|
namespace detail {
|
|
|
|
// Tag types used to select appropriately optimised overloads.
|
|
struct one_buffer {};
|
|
struct multiple_buffers {};
|
|
|
|
// Helper trait to detect single buffers.
|
|
template <typename BufferSequence>
|
|
struct buffer_sequence_cardinality :
|
|
conditional<
|
|
is_same<BufferSequence, mutable_buffer>::value
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
|
|| is_same<BufferSequence, mutable_buffers_1>::value
|
|
|| is_same<BufferSequence, const_buffers_1>::value
|
|
#endif // !defined(ASIO_NO_DEPRECATED)
|
|
|| is_same<BufferSequence, const_buffer>::value,
|
|
one_buffer, multiple_buffers>::type {};
|
|
|
|
template <typename Iterator>
|
|
inline std::size_t buffer_size(one_buffer,
|
|
Iterator begin, Iterator) ASIO_NOEXCEPT
|
|
{
|
|
return const_buffer(*begin).size();
|
|
}
|
|
|
|
template <typename Iterator>
|
|
inline std::size_t buffer_size(multiple_buffers,
|
|
Iterator begin, Iterator end) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t total_buffer_size = 0;
|
|
|
|
Iterator iter = begin;
|
|
for (; iter != end; ++iter)
|
|
{
|
|
const_buffer b(*iter);
|
|
total_buffer_size += b.size();
|
|
}
|
|
|
|
return total_buffer_size;
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
/// Get the total number of bytes in a buffer sequence.
|
|
/**
|
|
* The @c buffer_size function determines the total size of all buffers in the
|
|
* buffer sequence, as if computed as follows:
|
|
*
|
|
* @code size_t total_size = 0;
|
|
* auto i = asio::buffer_sequence_begin(buffers);
|
|
* auto end = asio::buffer_sequence_end(buffers);
|
|
* for (; i != end; ++i)
|
|
* {
|
|
* const_buffer b(*i);
|
|
* total_size += b.size();
|
|
* }
|
|
* return total_size; @endcode
|
|
*
|
|
* The @c BufferSequence template parameter may meet either of the @c
|
|
* ConstBufferSequence or @c MutableBufferSequence type requirements.
|
|
*/
|
|
template <typename BufferSequence>
|
|
inline std::size_t buffer_size(const BufferSequence& b) ASIO_NOEXCEPT
|
|
{
|
|
return detail::buffer_size(
|
|
detail::buffer_sequence_cardinality<BufferSequence>(),
|
|
asio::buffer_sequence_begin(b),
|
|
asio::buffer_sequence_end(b));
|
|
}
|
|
|
|
#if !defined(ASIO_NO_DEPRECATED)
|
|
|
|
/** @defgroup buffer_cast asio::buffer_cast
|
|
*
|
|
* @brief (Deprecated: Use the @c data() member function.) The
|
|
* asio::buffer_cast function is used to obtain a pointer to the
|
|
* underlying memory region associated with a buffer.
|
|
*
|
|
* @par Examples:
|
|
*
|
|
* To access the memory of a non-modifiable buffer, use:
|
|
* @code asio::const_buffer b1 = ...;
|
|
* const unsigned char* p1 = asio::buffer_cast<const unsigned char*>(b1);
|
|
* @endcode
|
|
*
|
|
* To access the memory of a modifiable buffer, use:
|
|
* @code asio::mutable_buffer b2 = ...;
|
|
* unsigned char* p2 = asio::buffer_cast<unsigned char*>(b2);
|
|
* @endcode
|
|
*
|
|
* The asio::buffer_cast function permits violations of type safety, so
|
|
* uses of it in application code should be carefully considered.
|
|
*/
|
|
/*@{*/
|
|
|
|
/// Cast a non-modifiable buffer to a specified pointer to POD type.
|
|
template <typename PointerToPodType>
|
|
inline PointerToPodType buffer_cast(const mutable_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return static_cast<PointerToPodType>(b.data());
|
|
}
|
|
|
|
/// Cast a non-modifiable buffer to a specified pointer to POD type.
|
|
template <typename PointerToPodType>
|
|
inline PointerToPodType buffer_cast(const const_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return static_cast<PointerToPodType>(b.data());
|
|
}
|
|
|
|
/*@}*/
|
|
|
|
#endif // !defined(ASIO_NO_DEPRECATED)
|
|
|
|
/// Create a new modifiable buffer that is offset from the start of another.
|
|
/**
|
|
* @relates mutable_buffer
|
|
*/
|
|
inline mutable_buffer operator+(const mutable_buffer& b,
|
|
std::size_t n) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t offset = n < b.size() ? n : b.size();
|
|
char* new_data = static_cast<char*>(b.data()) + offset;
|
|
std::size_t new_size = b.size() - offset;
|
|
return mutable_buffer(new_data, new_size
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, b.get_debug_check()
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new modifiable buffer that is offset from the start of another.
|
|
/**
|
|
* @relates mutable_buffer
|
|
*/
|
|
inline mutable_buffer operator+(std::size_t n,
|
|
const mutable_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return b + n;
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that is offset from the start of another.
|
|
/**
|
|
* @relates const_buffer
|
|
*/
|
|
inline const_buffer operator+(const const_buffer& b,
|
|
std::size_t n) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t offset = n < b.size() ? n : b.size();
|
|
const char* new_data = static_cast<const char*>(b.data()) + offset;
|
|
std::size_t new_size = b.size() - offset;
|
|
return const_buffer(new_data, new_size
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, b.get_debug_check()
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that is offset from the start of another.
|
|
/**
|
|
* @relates const_buffer
|
|
*/
|
|
inline const_buffer operator+(std::size_t n,
|
|
const const_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return b + n;
|
|
}
|
|
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
namespace detail {
|
|
|
|
template <typename Iterator>
|
|
class buffer_debug_check
|
|
{
|
|
public:
|
|
buffer_debug_check(Iterator iter)
|
|
: iter_(iter)
|
|
{
|
|
}
|
|
|
|
~buffer_debug_check()
|
|
{
|
|
#if defined(ASIO_MSVC) && (ASIO_MSVC == 1400)
|
|
// MSVC 8's string iterator checking may crash in a std::string::iterator
|
|
// object's destructor when the iterator points to an already-destroyed
|
|
// std::string object, unless the iterator is cleared first.
|
|
iter_ = Iterator();
|
|
#endif // defined(ASIO_MSVC) && (ASIO_MSVC == 1400)
|
|
}
|
|
|
|
void operator()()
|
|
{
|
|
*iter_;
|
|
}
|
|
|
|
private:
|
|
Iterator iter_;
|
|
};
|
|
|
|
} // namespace detail
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
|
|
/** @defgroup buffer asio::buffer
|
|
*
|
|
* @brief The asio::buffer function is used to create a buffer object to
|
|
* represent raw memory, an array of POD elements, a vector of POD elements,
|
|
* or a std::string.
|
|
*
|
|
* A buffer object represents a contiguous region of memory as a 2-tuple
|
|
* consisting of a pointer and size in bytes. A tuple of the form <tt>{void*,
|
|
* size_t}</tt> specifies a mutable (modifiable) region of memory. Similarly, a
|
|
* tuple of the form <tt>{const void*, size_t}</tt> specifies a const
|
|
* (non-modifiable) region of memory. These two forms correspond to the classes
|
|
* mutable_buffer and const_buffer, respectively. To mirror C++'s conversion
|
|
* rules, a mutable_buffer is implicitly convertible to a const_buffer, and the
|
|
* opposite conversion is not permitted.
|
|
*
|
|
* The simplest use case involves reading or writing a single buffer of a
|
|
* specified size:
|
|
*
|
|
* @code sock.send(asio::buffer(data, size)); @endcode
|
|
*
|
|
* In the above example, the return value of asio::buffer meets the
|
|
* requirements of the ConstBufferSequence concept so that it may be directly
|
|
* passed to the socket's write function. A buffer created for modifiable
|
|
* memory also meets the requirements of the MutableBufferSequence concept.
|
|
*
|
|
* An individual buffer may be created from a builtin array, std::vector,
|
|
* std::array or boost::array of POD elements. This helps prevent buffer
|
|
* overruns by automatically determining the size of the buffer:
|
|
*
|
|
* @code char d1[128];
|
|
* size_t bytes_transferred = sock.receive(asio::buffer(d1));
|
|
*
|
|
* std::vector<char> d2(128);
|
|
* bytes_transferred = sock.receive(asio::buffer(d2));
|
|
*
|
|
* std::array<char, 128> d3;
|
|
* bytes_transferred = sock.receive(asio::buffer(d3));
|
|
*
|
|
* boost::array<char, 128> d4;
|
|
* bytes_transferred = sock.receive(asio::buffer(d4)); @endcode
|
|
*
|
|
* In all three cases above, the buffers created are exactly 128 bytes long.
|
|
* Note that a vector is @e never automatically resized when creating or using
|
|
* a buffer. The buffer size is determined using the vector's <tt>size()</tt>
|
|
* member function, and not its capacity.
|
|
*
|
|
* @par Accessing Buffer Contents
|
|
*
|
|
* The contents of a buffer may be accessed using the @c data() and @c size()
|
|
* member functions:
|
|
*
|
|
* @code asio::mutable_buffer b1 = ...;
|
|
* std::size_t s1 = b1.size();
|
|
* unsigned char* p1 = static_cast<unsigned char*>(b1.data());
|
|
*
|
|
* asio::const_buffer b2 = ...;
|
|
* std::size_t s2 = b2.size();
|
|
* const void* p2 = b2.data(); @endcode
|
|
*
|
|
* The @c data() member function permits violations of type safety, so
|
|
* uses of it in application code should be carefully considered.
|
|
*
|
|
* For convenience, a @ref buffer_size function is provided that works with
|
|
* both buffers and buffer sequences (that is, types meeting the
|
|
* ConstBufferSequence or MutableBufferSequence type requirements). In this
|
|
* case, the function returns the total size of all buffers in the sequence.
|
|
*
|
|
* @par Buffer Copying
|
|
*
|
|
* The @ref buffer_copy function may be used to copy raw bytes between
|
|
* individual buffers and buffer sequences.
|
|
*
|
|
* In particular, when used with the @ref buffer_size function, the @ref
|
|
* buffer_copy function can be used to linearise a sequence of buffers. For
|
|
* example:
|
|
*
|
|
* @code vector<const_buffer> buffers = ...;
|
|
*
|
|
* vector<unsigned char> data(asio::buffer_size(buffers));
|
|
* asio::buffer_copy(asio::buffer(data), buffers); @endcode
|
|
*
|
|
* Note that @ref buffer_copy is implemented in terms of @c memcpy, and
|
|
* consequently it cannot be used to copy between overlapping memory regions.
|
|
*
|
|
* @par Buffer Invalidation
|
|
*
|
|
* A buffer object does not have any ownership of the memory it refers to. It
|
|
* is the responsibility of the application to ensure the memory region remains
|
|
* valid until it is no longer required for an I/O operation. When the memory
|
|
* is no longer available, the buffer is said to have been invalidated.
|
|
*
|
|
* For the asio::buffer overloads that accept an argument of type
|
|
* std::vector, the buffer objects returned are invalidated by any vector
|
|
* operation that also invalidates all references, pointers and iterators
|
|
* referring to the elements in the sequence (C++ Std, 23.2.4)
|
|
*
|
|
* For the asio::buffer overloads that accept an argument of type
|
|
* std::basic_string, the buffer objects returned are invalidated according to
|
|
* the rules defined for invalidation of references, pointers and iterators
|
|
* referring to elements of the sequence (C++ Std, 21.3).
|
|
*
|
|
* @par Buffer Arithmetic
|
|
*
|
|
* Buffer objects may be manipulated using simple arithmetic in a safe way
|
|
* which helps prevent buffer overruns. Consider an array initialised as
|
|
* follows:
|
|
*
|
|
* @code boost::array<char, 6> a = { 'a', 'b', 'c', 'd', 'e' }; @endcode
|
|
*
|
|
* A buffer object @c b1 created using:
|
|
*
|
|
* @code b1 = asio::buffer(a); @endcode
|
|
*
|
|
* represents the entire array, <tt>{ 'a', 'b', 'c', 'd', 'e' }</tt>. An
|
|
* optional second argument to the asio::buffer function may be used to
|
|
* limit the size, in bytes, of the buffer:
|
|
*
|
|
* @code b2 = asio::buffer(a, 3); @endcode
|
|
*
|
|
* such that @c b2 represents the data <tt>{ 'a', 'b', 'c' }</tt>. Even if the
|
|
* size argument exceeds the actual size of the array, the size of the buffer
|
|
* object created will be limited to the array size.
|
|
*
|
|
* An offset may be applied to an existing buffer to create a new one:
|
|
*
|
|
* @code b3 = b1 + 2; @endcode
|
|
*
|
|
* where @c b3 will set to represent <tt>{ 'c', 'd', 'e' }</tt>. If the offset
|
|
* exceeds the size of the existing buffer, the newly created buffer will be
|
|
* empty.
|
|
*
|
|
* Both an offset and size may be specified to create a buffer that corresponds
|
|
* to a specific range of bytes within an existing buffer:
|
|
*
|
|
* @code b4 = asio::buffer(b1 + 1, 3); @endcode
|
|
*
|
|
* so that @c b4 will refer to the bytes <tt>{ 'b', 'c', 'd' }</tt>.
|
|
*
|
|
* @par Buffers and Scatter-Gather I/O
|
|
*
|
|
* To read or write using multiple buffers (i.e. scatter-gather I/O), multiple
|
|
* buffer objects may be assigned into a container that supports the
|
|
* MutableBufferSequence (for read) or ConstBufferSequence (for write) concepts:
|
|
*
|
|
* @code
|
|
* char d1[128];
|
|
* std::vector<char> d2(128);
|
|
* boost::array<char, 128> d3;
|
|
*
|
|
* boost::array<mutable_buffer, 3> bufs1 = {
|
|
* asio::buffer(d1),
|
|
* asio::buffer(d2),
|
|
* asio::buffer(d3) };
|
|
* bytes_transferred = sock.receive(bufs1);
|
|
*
|
|
* std::vector<const_buffer> bufs2;
|
|
* bufs2.push_back(asio::buffer(d1));
|
|
* bufs2.push_back(asio::buffer(d2));
|
|
* bufs2.push_back(asio::buffer(d3));
|
|
* bytes_transferred = sock.send(bufs2); @endcode
|
|
*/
|
|
/*@{*/
|
|
|
|
#if defined(ASIO_NO_DEPRECATED) || defined(GENERATING_DOCUMENTATION)
|
|
# define ASIO_MUTABLE_BUFFER mutable_buffer
|
|
# define ASIO_CONST_BUFFER const_buffer
|
|
#else // defined(ASIO_NO_DEPRECATED) || defined(GENERATING_DOCUMENTATION)
|
|
# define ASIO_MUTABLE_BUFFER mutable_buffers_1
|
|
# define ASIO_CONST_BUFFER const_buffers_1
|
|
#endif // defined(ASIO_NO_DEPRECATED) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Create a new modifiable buffer from an existing buffer.
|
|
/**
|
|
* @returns <tt>mutable_buffer(b)</tt>.
|
|
*/
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
const mutable_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(b);
|
|
}
|
|
|
|
/// Create a new modifiable buffer from an existing buffer.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* b.data(),
|
|
* min(b.size(), max_size_in_bytes)); @endcode
|
|
*/
|
|
inline ASIO_MUTABLE_BUFFER buffer(const mutable_buffer& b,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(
|
|
mutable_buffer(b.data(),
|
|
b.size() < max_size_in_bytes
|
|
? b.size() : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, b.get_debug_check()
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer from an existing buffer.
|
|
/**
|
|
* @returns <tt>const_buffer(b)</tt>.
|
|
*/
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const const_buffer& b) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(b);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer from an existing buffer.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* b.data(),
|
|
* min(b.size(), max_size_in_bytes)); @endcode
|
|
*/
|
|
inline ASIO_CONST_BUFFER buffer(const const_buffer& b,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(b.data(),
|
|
b.size() < max_size_in_bytes
|
|
? b.size() : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, b.get_debug_check()
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given memory range.
|
|
/**
|
|
* @returns <tt>mutable_buffer(data, size_in_bytes)</tt>.
|
|
*/
|
|
inline ASIO_MUTABLE_BUFFER buffer(void* data,
|
|
std::size_t size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data, size_in_bytes);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given memory range.
|
|
/**
|
|
* @returns <tt>const_buffer(data, size_in_bytes)</tt>.
|
|
*/
|
|
inline ASIO_CONST_BUFFER buffer(const void* data,
|
|
std::size_t size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data, size_in_bytes);
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* static_cast<void*>(data),
|
|
* N * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(PodType (&data)[N]) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data, N * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* static_cast<void*>(data),
|
|
* min(N * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(PodType (&data)[N],
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data,
|
|
N * sizeof(PodType) < max_size_in_bytes
|
|
? N * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* static_cast<const void*>(data),
|
|
* N * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const PodType (&data)[N]) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data, N * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* static_cast<const void*>(data),
|
|
* min(N * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(const PodType (&data)[N],
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data,
|
|
N * sizeof(PodType) < max_size_in_bytes
|
|
? N * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
#if defined(ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND)
|
|
|
|
// Borland C++ and Sun Studio think the overloads:
|
|
//
|
|
// unspecified buffer(boost::array<PodType, N>& array ...);
|
|
//
|
|
// and
|
|
//
|
|
// unspecified buffer(boost::array<const PodType, N>& array ...);
|
|
//
|
|
// are ambiguous. This will be worked around by using a buffer_types traits
|
|
// class that contains typedefs for the appropriate buffer and container
|
|
// classes, based on whether PodType is const or non-const.
|
|
|
|
namespace detail {
|
|
|
|
template <bool IsConst>
|
|
struct buffer_types_base;
|
|
|
|
template <>
|
|
struct buffer_types_base<false>
|
|
{
|
|
typedef mutable_buffer buffer_type;
|
|
typedef ASIO_MUTABLE_BUFFER container_type;
|
|
};
|
|
|
|
template <>
|
|
struct buffer_types_base<true>
|
|
{
|
|
typedef const_buffer buffer_type;
|
|
typedef ASIO_CONST_BUFFER container_type;
|
|
};
|
|
|
|
template <typename PodType>
|
|
struct buffer_types
|
|
: public buffer_types_base<is_const<PodType>::value>
|
|
{
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
template <typename PodType, std::size_t N>
|
|
inline typename detail::buffer_types<PodType>::container_type
|
|
buffer(boost::array<PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
typedef typename asio::detail::buffer_types<PodType>::buffer_type
|
|
buffer_type;
|
|
typedef typename asio::detail::buffer_types<PodType>::container_type
|
|
container_type;
|
|
return container_type(
|
|
buffer_type(data.c_array(), data.size() * sizeof(PodType)));
|
|
}
|
|
|
|
template <typename PodType, std::size_t N>
|
|
inline typename detail::buffer_types<PodType>::container_type
|
|
buffer(boost::array<PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
typedef typename asio::detail::buffer_types<PodType>::buffer_type
|
|
buffer_type;
|
|
typedef typename asio::detail::buffer_types<PodType>::container_type
|
|
container_type;
|
|
return container_type(
|
|
buffer_type(data.c_array(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes));
|
|
}
|
|
|
|
#else // defined(ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND)
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
boost::array<PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(
|
|
data.c_array(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(boost::array<PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.c_array(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
boost::array<const PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(boost::array<const PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
#endif // defined(ASIO_ENABLE_ARRAY_BUFFER_WORKAROUND)
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const boost::array<PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(const boost::array<PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
#if defined(ASIO_HAS_STD_ARRAY) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
std::array<PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.data(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_MUTABLE_BUFFER buffer(std::array<PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.data(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
std::array<const PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(std::array<const PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const std::array<PodType, N>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(), data.size() * sizeof(PodType));
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD array.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*/
|
|
template <typename PodType, std::size_t N>
|
|
inline ASIO_CONST_BUFFER buffer(const std::array<PodType, N>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(),
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes);
|
|
}
|
|
|
|
#endif // defined(ASIO_HAS_STD_ARRAY) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Create a new modifiable buffer that represents the given POD vector.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.size() ? &data[0] : 0,
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any vector operation that would also
|
|
* invalidate iterators.
|
|
*/
|
|
template <typename PodType, typename Allocator>
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
std::vector<PodType, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(
|
|
data.size() ? &data[0] : 0, data.size() * sizeof(PodType)
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::vector<PodType, Allocator>::iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given POD vector.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.size() ? &data[0] : 0,
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any vector operation that would also
|
|
* invalidate iterators.
|
|
*/
|
|
template <typename PodType, typename Allocator>
|
|
inline ASIO_MUTABLE_BUFFER buffer(std::vector<PodType, Allocator>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.size() ? &data[0] : 0,
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::vector<PodType, Allocator>::iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD vector.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.size() ? &data[0] : 0,
|
|
* data.size() * sizeof(PodType)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any vector operation that would also
|
|
* invalidate iterators.
|
|
*/
|
|
template <typename PodType, typename Allocator>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const std::vector<PodType, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(
|
|
data.size() ? &data[0] : 0, data.size() * sizeof(PodType)
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::vector<PodType, Allocator>::const_iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given POD vector.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.size() ? &data[0] : 0,
|
|
* min(data.size() * sizeof(PodType), max_size_in_bytes)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any vector operation that would also
|
|
* invalidate iterators.
|
|
*/
|
|
template <typename PodType, typename Allocator>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const std::vector<PodType, Allocator>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.size() ? &data[0] : 0,
|
|
data.size() * sizeof(PodType) < max_size_in_bytes
|
|
? data.size() * sizeof(PodType) : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::vector<PodType, Allocator>::const_iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new modifiable buffer that represents the given string.
|
|
/**
|
|
* @returns <tt>mutable_buffer(data.size() ? &data[0] : 0,
|
|
* data.size() * sizeof(Elem))</tt>.
|
|
*
|
|
* @note The buffer is invalidated by any non-const operation called on the
|
|
* given string object.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
std::basic_string<Elem, Traits, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.size() ? &data[0] : 0,
|
|
data.size() * sizeof(Elem)
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::basic_string<Elem, Traits, Allocator>::iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given string.
|
|
/**
|
|
* @returns A mutable_buffer value equivalent to:
|
|
* @code mutable_buffer(
|
|
* data.size() ? &data[0] : 0,
|
|
* min(data.size() * sizeof(Elem), max_size_in_bytes)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any non-const operation called on the
|
|
* given string object.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline ASIO_MUTABLE_BUFFER buffer(
|
|
std::basic_string<Elem, Traits, Allocator>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_MUTABLE_BUFFER(data.size() ? &data[0] : 0,
|
|
data.size() * sizeof(Elem) < max_size_in_bytes
|
|
? data.size() * sizeof(Elem) : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::basic_string<Elem, Traits, Allocator>::iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given string.
|
|
/**
|
|
* @returns <tt>const_buffer(data.data(), data.size() * sizeof(Elem))</tt>.
|
|
*
|
|
* @note The buffer is invalidated by any non-const operation called on the
|
|
* given string object.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const std::basic_string<Elem, Traits, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(), data.size() * sizeof(Elem)
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::basic_string<Elem, Traits, Allocator>::const_iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/// Create a new non-modifiable buffer that represents the given string.
|
|
/**
|
|
* @returns A const_buffer value equivalent to:
|
|
* @code const_buffer(
|
|
* data.data(),
|
|
* min(data.size() * sizeof(Elem), max_size_in_bytes)); @endcode
|
|
*
|
|
* @note The buffer is invalidated by any non-const operation called on the
|
|
* given string object.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline ASIO_CONST_BUFFER buffer(
|
|
const std::basic_string<Elem, Traits, Allocator>& data,
|
|
std::size_t max_size_in_bytes) ASIO_NOEXCEPT
|
|
{
|
|
return ASIO_CONST_BUFFER(data.data(),
|
|
data.size() * sizeof(Elem) < max_size_in_bytes
|
|
? data.size() * sizeof(Elem) : max_size_in_bytes
|
|
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
|
|
, detail::buffer_debug_check<
|
|
typename std::basic_string<Elem, Traits, Allocator>::const_iterator
|
|
>(data.begin())
|
|
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
|
|
);
|
|
}
|
|
|
|
/*@}*/
|
|
|
|
/// Adapt a basic_string to the DynamicBufferSequence requirements.
|
|
/**
|
|
* Requires that <tt>sizeof(Elem) == 1</tt>.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
class dynamic_string_buffer
|
|
{
|
|
public:
|
|
/// The type used to represent the input sequence as a list of buffers.
|
|
typedef ASIO_CONST_BUFFER const_buffers_type;
|
|
|
|
/// The type used to represent the output sequence as a list of buffers.
|
|
typedef ASIO_MUTABLE_BUFFER mutable_buffers_type;
|
|
|
|
/// Construct a dynamic buffer from a string.
|
|
/**
|
|
* @param s The string to be used as backing storage for the dynamic buffer.
|
|
* Any existing data in the string is treated as the dynamic buffer's input
|
|
* sequence. The object stores a reference to the string and the user is
|
|
* responsible for ensuring that the string object remains valid until the
|
|
* dynamic_string_buffer object is destroyed.
|
|
*
|
|
* @param maximum_size Specifies a maximum size for the buffer, in bytes.
|
|
*/
|
|
explicit dynamic_string_buffer(std::basic_string<Elem, Traits, Allocator>& s,
|
|
std::size_t maximum_size =
|
|
(std::numeric_limits<std::size_t>::max)()) ASIO_NOEXCEPT
|
|
: string_(s),
|
|
size_(string_.size()),
|
|
max_size_(maximum_size)
|
|
{
|
|
}
|
|
|
|
#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
|
|
/// Move construct a dynamic buffer.
|
|
dynamic_string_buffer(dynamic_string_buffer&& other) ASIO_NOEXCEPT
|
|
: string_(other.string_),
|
|
size_(other.size_),
|
|
max_size_(other.max_size_)
|
|
{
|
|
}
|
|
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Get the size of the input sequence.
|
|
std::size_t size() const ASIO_NOEXCEPT
|
|
{
|
|
return size_;
|
|
}
|
|
|
|
/// Get the maximum size of the dynamic buffer.
|
|
/**
|
|
* @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 dynamic buffer.
|
|
/**
|
|
* @returns The current total capacity of the buffer, i.e. for both the input
|
|
* sequence and output sequence.
|
|
*/
|
|
std::size_t capacity() const ASIO_NOEXCEPT
|
|
{
|
|
return string_.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 the basic_string memory in
|
|
* input sequence.
|
|
*
|
|
* @note The returned object is invalidated by any @c dynamic_string_buffer
|
|
* or @c basic_string member function that modifies the input sequence or
|
|
* output sequence.
|
|
*/
|
|
const_buffers_type data() const ASIO_NOEXCEPT
|
|
{
|
|
return const_buffers_type(asio::buffer(string_, size_));
|
|
}
|
|
|
|
/// Get a list of buffers that represents the output sequence, with the given
|
|
/// size.
|
|
/**
|
|
* Ensures that the output sequence can accommodate @c n bytes, resizing the
|
|
* basic_string object as necessary.
|
|
*
|
|
* @returns An object of type @c mutable_buffers_type that satisfies
|
|
* MutableBufferSequence requirements, representing basic_string memory
|
|
* at the start of the output sequence of size @c n.
|
|
*
|
|
* @throws std::length_error If <tt>size() + n > max_size()</tt>.
|
|
*
|
|
* @note The returned object is invalidated by any @c dynamic_string_buffer
|
|
* or @c basic_string member function that modifies the input sequence or
|
|
* output sequence.
|
|
*/
|
|
mutable_buffers_type prepare(std::size_t n)
|
|
{
|
|
if (size () > max_size() || max_size() - size() < n)
|
|
{
|
|
std::length_error ex("dynamic_string_buffer too long");
|
|
asio::detail::throw_exception(ex);
|
|
}
|
|
|
|
string_.resize(size_ + n);
|
|
|
|
return asio::buffer(asio::buffer(string_) + size_, n);
|
|
}
|
|
|
|
/// Move bytes from the output sequence to the input sequence.
|
|
/**
|
|
* @param n The number of bytes to append from the start of the output
|
|
* sequence to the end of the input sequence. The remainder of the output
|
|
* sequence is discarded.
|
|
*
|
|
* 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)
|
|
{
|
|
size_ += (std::min)(n, string_.size() - size_);
|
|
string_.resize(size_);
|
|
}
|
|
|
|
/// 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)
|
|
{
|
|
std::size_t consume_length = (std::min)(n, size_);
|
|
string_.erase(0, consume_length);
|
|
size_ -= consume_length;
|
|
}
|
|
|
|
private:
|
|
std::basic_string<Elem, Traits, Allocator>& string_;
|
|
std::size_t size_;
|
|
const std::size_t max_size_;
|
|
};
|
|
|
|
/// Adapt a vector to the DynamicBufferSequence requirements.
|
|
/**
|
|
* Requires that <tt>sizeof(Elem) == 1</tt>.
|
|
*/
|
|
template <typename Elem, typename Allocator>
|
|
class dynamic_vector_buffer
|
|
{
|
|
public:
|
|
/// The type used to represent the input sequence as a list of buffers.
|
|
typedef ASIO_CONST_BUFFER const_buffers_type;
|
|
|
|
/// The type used to represent the output sequence as a list of buffers.
|
|
typedef ASIO_MUTABLE_BUFFER mutable_buffers_type;
|
|
|
|
/// Construct a dynamic buffer from a string.
|
|
/**
|
|
* @param v The vector to be used as backing storage for the dynamic buffer.
|
|
* Any existing data in the vector is treated as the dynamic buffer's input
|
|
* sequence. The object stores a reference to the vector and the user is
|
|
* responsible for ensuring that the vector object remains valid until the
|
|
* dynamic_vector_buffer object is destroyed.
|
|
*
|
|
* @param maximum_size Specifies a maximum size for the buffer, in bytes.
|
|
*/
|
|
explicit dynamic_vector_buffer(std::vector<Elem, Allocator>& v,
|
|
std::size_t maximum_size =
|
|
(std::numeric_limits<std::size_t>::max)()) ASIO_NOEXCEPT
|
|
: vector_(v),
|
|
size_(vector_.size()),
|
|
max_size_(maximum_size)
|
|
{
|
|
}
|
|
|
|
#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
|
|
/// Move construct a dynamic buffer.
|
|
dynamic_vector_buffer(dynamic_vector_buffer&& other) ASIO_NOEXCEPT
|
|
: vector_(other.vector_),
|
|
size_(other.size_),
|
|
max_size_(other.max_size_)
|
|
{
|
|
}
|
|
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Get the size of the input sequence.
|
|
std::size_t size() const ASIO_NOEXCEPT
|
|
{
|
|
return size_;
|
|
}
|
|
|
|
/// Get the maximum size of the dynamic buffer.
|
|
/**
|
|
* @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 dynamic buffer.
|
|
/**
|
|
* @returns The current total capacity of the buffer, i.e. for both the input
|
|
* sequence and output sequence.
|
|
*/
|
|
std::size_t capacity() const ASIO_NOEXCEPT
|
|
{
|
|
return vector_.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 the basic_string memory in
|
|
* input sequence.
|
|
*
|
|
* @note The returned object is invalidated by any @c dynamic_vector_buffer
|
|
* or @c basic_string member function that modifies the input sequence or
|
|
* output sequence.
|
|
*/
|
|
const_buffers_type data() const ASIO_NOEXCEPT
|
|
{
|
|
return const_buffers_type(asio::buffer(vector_, size_));
|
|
}
|
|
|
|
/// Get a list of buffers that represents the output sequence, with the given
|
|
/// size.
|
|
/**
|
|
* Ensures that the output sequence can accommodate @c n bytes, resizing the
|
|
* basic_string object as necessary.
|
|
*
|
|
* @returns An object of type @c mutable_buffers_type that satisfies
|
|
* MutableBufferSequence requirements, representing basic_string memory
|
|
* at the start of the output sequence of size @c n.
|
|
*
|
|
* @throws std::length_error If <tt>size() + n > max_size()</tt>.
|
|
*
|
|
* @note The returned object is invalidated by any @c dynamic_vector_buffer
|
|
* or @c basic_string member function that modifies the input sequence or
|
|
* output sequence.
|
|
*/
|
|
mutable_buffers_type prepare(std::size_t n)
|
|
{
|
|
if (size () > max_size() || max_size() - size() < n)
|
|
{
|
|
std::length_error ex("dynamic_vector_buffer too long");
|
|
asio::detail::throw_exception(ex);
|
|
}
|
|
|
|
vector_.resize(size_ + n);
|
|
|
|
return asio::buffer(asio::buffer(vector_) + size_, n);
|
|
}
|
|
|
|
/// Move bytes from the output sequence to the input sequence.
|
|
/**
|
|
* @param n The number of bytes to append from the start of the output
|
|
* sequence to the end of the input sequence. The remainder of the output
|
|
* sequence is discarded.
|
|
*
|
|
* 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)
|
|
{
|
|
size_ += (std::min)(n, vector_.size() - size_);
|
|
vector_.resize(size_);
|
|
}
|
|
|
|
/// 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)
|
|
{
|
|
std::size_t consume_length = (std::min)(n, size_);
|
|
vector_.erase(vector_.begin(), vector_.begin() + consume_length);
|
|
size_ -= consume_length;
|
|
}
|
|
|
|
private:
|
|
std::vector<Elem, Allocator>& vector_;
|
|
std::size_t size_;
|
|
const std::size_t max_size_;
|
|
};
|
|
|
|
/** @defgroup dynamic_buffer asio::dynamic_buffer
|
|
*
|
|
* @brief The asio::dynamic_buffer function is used to create a
|
|
* dynamically resized buffer from a @c std::basic_string or @c std::vector.
|
|
*/
|
|
/*@{*/
|
|
|
|
/// Create a new dynamic buffer that represents the given string.
|
|
/**
|
|
* @returns <tt>dynamic_string_buffer<Elem, Traits, Allocator>(data)</tt>.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline dynamic_string_buffer<Elem, Traits, Allocator> dynamic_buffer(
|
|
std::basic_string<Elem, Traits, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return dynamic_string_buffer<Elem, Traits, Allocator>(data);
|
|
}
|
|
|
|
/// Create a new dynamic buffer that represents the given string.
|
|
/**
|
|
* @returns <tt>dynamic_string_buffer<Elem, Traits, Allocator>(data,
|
|
* max_size)</tt>.
|
|
*/
|
|
template <typename Elem, typename Traits, typename Allocator>
|
|
inline dynamic_string_buffer<Elem, Traits, Allocator> dynamic_buffer(
|
|
std::basic_string<Elem, Traits, Allocator>& data,
|
|
std::size_t max_size) ASIO_NOEXCEPT
|
|
{
|
|
return dynamic_string_buffer<Elem, Traits, Allocator>(data, max_size);
|
|
}
|
|
|
|
/// Create a new dynamic buffer that represents the given vector.
|
|
/**
|
|
* @returns <tt>dynamic_vector_buffer<Elem, Allocator>(data)</tt>.
|
|
*/
|
|
template <typename Elem, typename Allocator>
|
|
inline dynamic_vector_buffer<Elem, Allocator> dynamic_buffer(
|
|
std::vector<Elem, Allocator>& data) ASIO_NOEXCEPT
|
|
{
|
|
return dynamic_vector_buffer<Elem, Allocator>(data);
|
|
}
|
|
|
|
/// Create a new dynamic buffer that represents the given vector.
|
|
/**
|
|
* @returns <tt>dynamic_vector_buffer<Elem, Allocator>(data, max_size)</tt>.
|
|
*/
|
|
template <typename Elem, typename Allocator>
|
|
inline dynamic_vector_buffer<Elem, Allocator> dynamic_buffer(
|
|
std::vector<Elem, Allocator>& data,
|
|
std::size_t max_size) ASIO_NOEXCEPT
|
|
{
|
|
return dynamic_vector_buffer<Elem, Allocator>(data, max_size);
|
|
}
|
|
|
|
/*@}*/
|
|
|
|
/** @defgroup buffer_copy asio::buffer_copy
|
|
*
|
|
* @brief The asio::buffer_copy function is used to copy bytes from a
|
|
* source buffer (or buffer sequence) to a target buffer (or buffer sequence).
|
|
*
|
|
* The @c buffer_copy function is available in two forms:
|
|
*
|
|
* @li A 2-argument form: @c buffer_copy(target, source)
|
|
*
|
|
* @li A 3-argument form: @c buffer_copy(target, source, max_bytes_to_copy)
|
|
*
|
|
* Both forms return the number of bytes actually copied. The number of bytes
|
|
* copied is the lesser of:
|
|
*
|
|
* @li @c buffer_size(target)
|
|
*
|
|
* @li @c buffer_size(source)
|
|
*
|
|
* @li @c If specified, @c max_bytes_to_copy.
|
|
*
|
|
* This prevents buffer overflow, regardless of the buffer sizes used in the
|
|
* copy operation.
|
|
*
|
|
* Note that @ref buffer_copy is implemented in terms of @c memcpy, and
|
|
* consequently it cannot be used to copy between overlapping memory regions.
|
|
*/
|
|
/*@{*/
|
|
|
|
namespace detail {
|
|
|
|
inline std::size_t buffer_copy_1(const mutable_buffer& target,
|
|
const const_buffer& source)
|
|
{
|
|
using namespace std; // For memcpy.
|
|
std::size_t target_size = target.size();
|
|
std::size_t source_size = source.size();
|
|
std::size_t n = target_size < source_size ? target_size : source_size;
|
|
memcpy(target.data(), source.data(), n);
|
|
return n;
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
inline std::size_t buffer_copy(one_buffer, one_buffer,
|
|
TargetIterator target_begin, TargetIterator,
|
|
SourceIterator source_begin, SourceIterator) ASIO_NOEXCEPT
|
|
{
|
|
return (buffer_copy_1)(*target_begin, *source_begin);
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
inline std::size_t buffer_copy(one_buffer, one_buffer,
|
|
TargetIterator target_begin, TargetIterator,
|
|
SourceIterator source_begin, SourceIterator,
|
|
std::size_t max_bytes_to_copy) ASIO_NOEXCEPT
|
|
{
|
|
return (buffer_copy_1)(*target_begin,
|
|
asio::buffer(*source_begin, max_bytes_to_copy));
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
std::size_t buffer_copy(one_buffer, multiple_buffers,
|
|
TargetIterator target_begin, TargetIterator,
|
|
SourceIterator source_begin, SourceIterator source_end,
|
|
std::size_t max_bytes_to_copy
|
|
= (std::numeric_limits<std::size_t>::max)()) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t total_bytes_copied = 0;
|
|
SourceIterator source_iter = source_begin;
|
|
|
|
for (mutable_buffer target_buffer(
|
|
asio::buffer(*target_begin, max_bytes_to_copy));
|
|
target_buffer.size() && source_iter != source_end; ++source_iter)
|
|
{
|
|
const_buffer source_buffer(*source_iter);
|
|
std::size_t bytes_copied = (buffer_copy_1)(target_buffer, source_buffer);
|
|
total_bytes_copied += bytes_copied;
|
|
target_buffer += bytes_copied;
|
|
}
|
|
|
|
return total_bytes_copied;
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
std::size_t buffer_copy(multiple_buffers, one_buffer,
|
|
TargetIterator target_begin, TargetIterator target_end,
|
|
SourceIterator source_begin, SourceIterator,
|
|
std::size_t max_bytes_to_copy
|
|
= (std::numeric_limits<std::size_t>::max)()) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t total_bytes_copied = 0;
|
|
TargetIterator target_iter = target_begin;
|
|
|
|
for (const_buffer source_buffer(
|
|
asio::buffer(*source_begin, max_bytes_to_copy));
|
|
source_buffer.size() && target_iter != target_end; ++target_iter)
|
|
{
|
|
mutable_buffer target_buffer(*target_iter);
|
|
std::size_t bytes_copied = (buffer_copy_1)(target_buffer, source_buffer);
|
|
total_bytes_copied += bytes_copied;
|
|
source_buffer += bytes_copied;
|
|
}
|
|
|
|
return total_bytes_copied;
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
std::size_t buffer_copy(multiple_buffers, multiple_buffers,
|
|
TargetIterator target_begin, TargetIterator target_end,
|
|
SourceIterator source_begin, SourceIterator source_end) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t total_bytes_copied = 0;
|
|
|
|
TargetIterator target_iter = target_begin;
|
|
std::size_t target_buffer_offset = 0;
|
|
|
|
SourceIterator source_iter = source_begin;
|
|
std::size_t source_buffer_offset = 0;
|
|
|
|
while (target_iter != target_end && source_iter != source_end)
|
|
{
|
|
mutable_buffer target_buffer =
|
|
mutable_buffer(*target_iter) + target_buffer_offset;
|
|
|
|
const_buffer source_buffer =
|
|
const_buffer(*source_iter) + source_buffer_offset;
|
|
|
|
std::size_t bytes_copied = (buffer_copy_1)(target_buffer, source_buffer);
|
|
total_bytes_copied += bytes_copied;
|
|
|
|
if (bytes_copied == target_buffer.size())
|
|
{
|
|
++target_iter;
|
|
target_buffer_offset = 0;
|
|
}
|
|
else
|
|
target_buffer_offset += bytes_copied;
|
|
|
|
if (bytes_copied == source_buffer.size())
|
|
{
|
|
++source_iter;
|
|
source_buffer_offset = 0;
|
|
}
|
|
else
|
|
source_buffer_offset += bytes_copied;
|
|
}
|
|
|
|
return total_bytes_copied;
|
|
}
|
|
|
|
template <typename TargetIterator, typename SourceIterator>
|
|
std::size_t buffer_copy(multiple_buffers, multiple_buffers,
|
|
TargetIterator target_begin, TargetIterator target_end,
|
|
SourceIterator source_begin, SourceIterator source_end,
|
|
std::size_t max_bytes_to_copy) ASIO_NOEXCEPT
|
|
{
|
|
std::size_t total_bytes_copied = 0;
|
|
|
|
TargetIterator target_iter = target_begin;
|
|
std::size_t target_buffer_offset = 0;
|
|
|
|
SourceIterator source_iter = source_begin;
|
|
std::size_t source_buffer_offset = 0;
|
|
|
|
while (total_bytes_copied != max_bytes_to_copy
|
|
&& target_iter != target_end && source_iter != source_end)
|
|
{
|
|
mutable_buffer target_buffer =
|
|
mutable_buffer(*target_iter) + target_buffer_offset;
|
|
|
|
const_buffer source_buffer =
|
|
const_buffer(*source_iter) + source_buffer_offset;
|
|
|
|
std::size_t bytes_copied = (buffer_copy_1)(
|
|
target_buffer, asio::buffer(source_buffer,
|
|
max_bytes_to_copy - total_bytes_copied));
|
|
total_bytes_copied += bytes_copied;
|
|
|
|
if (bytes_copied == target_buffer.size())
|
|
{
|
|
++target_iter;
|
|
target_buffer_offset = 0;
|
|
}
|
|
else
|
|
target_buffer_offset += bytes_copied;
|
|
|
|
if (bytes_copied == source_buffer.size())
|
|
{
|
|
++source_iter;
|
|
source_buffer_offset = 0;
|
|
}
|
|
else
|
|
source_buffer_offset += bytes_copied;
|
|
}
|
|
|
|
return total_bytes_copied;
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
/// Copies bytes from a source buffer sequence to a target buffer sequence.
|
|
/**
|
|
* @param target A modifiable buffer sequence representing the memory regions to
|
|
* which the bytes will be copied.
|
|
*
|
|
* @param source A non-modifiable buffer sequence representing the memory
|
|
* regions from which the bytes will be copied.
|
|
*
|
|
* @returns The number of bytes copied.
|
|
*
|
|
* @note The number of bytes copied is the lesser of:
|
|
*
|
|
* @li @c buffer_size(target)
|
|
*
|
|
* @li @c buffer_size(source)
|
|
*
|
|
* This function is implemented in terms of @c memcpy, and consequently it
|
|
* cannot be used to copy between overlapping memory regions.
|
|
*/
|
|
template <typename MutableBufferSequence, typename ConstBufferSequence>
|
|
inline std::size_t buffer_copy(const MutableBufferSequence& target,
|
|
const ConstBufferSequence& source) ASIO_NOEXCEPT
|
|
{
|
|
return detail::buffer_copy(
|
|
detail::buffer_sequence_cardinality<MutableBufferSequence>(),
|
|
detail::buffer_sequence_cardinality<ConstBufferSequence>(),
|
|
asio::buffer_sequence_begin(target),
|
|
asio::buffer_sequence_end(target),
|
|
asio::buffer_sequence_begin(source),
|
|
asio::buffer_sequence_end(source));
|
|
}
|
|
|
|
/// Copies a limited number of bytes from a source buffer sequence to a target
|
|
/// buffer sequence.
|
|
/**
|
|
* @param target A modifiable buffer sequence representing the memory regions to
|
|
* which the bytes will be copied.
|
|
*
|
|
* @param source A non-modifiable buffer sequence representing the memory
|
|
* regions from which the bytes will be copied.
|
|
*
|
|
* @param max_bytes_to_copy The maximum number of bytes to be copied.
|
|
*
|
|
* @returns The number of bytes copied.
|
|
*
|
|
* @note The number of bytes copied is the lesser of:
|
|
*
|
|
* @li @c buffer_size(target)
|
|
*
|
|
* @li @c buffer_size(source)
|
|
*
|
|
* @li @c max_bytes_to_copy
|
|
*
|
|
* This function is implemented in terms of @c memcpy, and consequently it
|
|
* cannot be used to copy between overlapping memory regions.
|
|
*/
|
|
template <typename MutableBufferSequence, typename ConstBufferSequence>
|
|
inline std::size_t buffer_copy(const MutableBufferSequence& target,
|
|
const ConstBufferSequence& source,
|
|
std::size_t max_bytes_to_copy) ASIO_NOEXCEPT
|
|
{
|
|
return detail::buffer_copy(
|
|
detail::buffer_sequence_cardinality<MutableBufferSequence>(),
|
|
detail::buffer_sequence_cardinality<ConstBufferSequence>(),
|
|
asio::buffer_sequence_begin(target),
|
|
asio::buffer_sequence_end(target),
|
|
asio::buffer_sequence_begin(source),
|
|
asio::buffer_sequence_end(source), max_bytes_to_copy);
|
|
}
|
|
|
|
/*@}*/
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_BUFFER_HPP
|