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+//
+// detail/buffer_sequence_adapter.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_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
+#define ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/buffer.hpp"
+#include "asio/detail/array_fwd.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class buffer_sequence_adapter_base
+{
+#if defined(ASIO_WINDOWS_RUNTIME)
+public:
+ // The maximum number of buffers to support in a single operation.
+ enum { max_buffers = 1 };
+
+protected:
+ typedef Windows::Storage::Streams::IBuffer^ native_buffer_type;
+
+ ASIO_DECL static void init_native_buffer(
+ native_buffer_type& buf,
+ const asio::mutable_buffer& buffer);
+
+ ASIO_DECL static void init_native_buffer(
+ native_buffer_type& buf,
+ const asio::const_buffer& buffer);
+#elif defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+public:
+ // The maximum number of buffers to support in a single operation.
+ enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
+
+protected:
+ typedef WSABUF native_buffer_type;
+
+ static void init_native_buffer(WSABUF& buf,
+ const asio::mutable_buffer& buffer)
+ {
+ buf.buf = static_cast<char*>(buffer.data());
+ buf.len = static_cast<ULONG>(buffer.size());
+ }
+
+ static void init_native_buffer(WSABUF& buf,
+ const asio::const_buffer& buffer)
+ {
+ buf.buf = const_cast<char*>(static_cast<const char*>(buffer.data()));
+ buf.len = static_cast<ULONG>(buffer.size());
+ }
+#else // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+public:
+ // The maximum number of buffers to support in a single operation.
+ enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
+
+protected:
+ typedef iovec native_buffer_type;
+
+ static void init_iov_base(void*& base, void* addr)
+ {
+ base = addr;
+ }
+
+ template <typename T>
+ static void init_iov_base(T& base, void* addr)
+ {
+ base = static_cast<T>(addr);
+ }
+
+ static void init_native_buffer(iovec& iov,
+ const asio::mutable_buffer& buffer)
+ {
+ init_iov_base(iov.iov_base, buffer.data());
+ iov.iov_len = buffer.size();
+ }
+
+ static void init_native_buffer(iovec& iov,
+ const asio::const_buffer& buffer)
+ {
+ init_iov_base(iov.iov_base, const_cast<void*>(buffer.data()));
+ iov.iov_len = buffer.size();
+ }
+#endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
+};
+
+// Helper class to translate buffers into the native buffer representation.
+template <typename Buffer, typename Buffers>
+class buffer_sequence_adapter
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(const Buffers& buffer_sequence)
+ : count_(0), total_buffer_size_(0)
+ {
+ buffer_sequence_adapter::init(
+ asio::buffer_sequence_begin(buffer_sequence),
+ asio::buffer_sequence_end(buffer_sequence));
+ }
+
+ native_buffer_type* buffers()
+ {
+ return buffers_;
+ }
+
+ std::size_t count() const
+ {
+ return count_;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const Buffers& buffer_sequence)
+ {
+ return buffer_sequence_adapter::all_empty(
+ asio::buffer_sequence_begin(buffer_sequence),
+ asio::buffer_sequence_end(buffer_sequence));
+ }
+
+ static void validate(const Buffers& buffer_sequence)
+ {
+ buffer_sequence_adapter::validate(
+ asio::buffer_sequence_begin(buffer_sequence),
+ asio::buffer_sequence_end(buffer_sequence));
+ }
+
+ static Buffer first(const Buffers& buffer_sequence)
+ {
+ return buffer_sequence_adapter::first(
+ asio::buffer_sequence_begin(buffer_sequence),
+ asio::buffer_sequence_end(buffer_sequence));
+ }
+
+private:
+ template <typename Iterator>
+ void init(Iterator begin, Iterator end)
+ {
+ Iterator iter = begin;
+ for (; iter != end && count_ < max_buffers; ++iter, ++count_)
+ {
+ Buffer buffer(*iter);
+ init_native_buffer(buffers_[count_], buffer);
+ total_buffer_size_ += buffer.size();
+ }
+ }
+
+ template <typename Iterator>
+ static bool all_empty(Iterator begin, Iterator end)
+ {
+ Iterator iter = begin;
+ std::size_t i = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ if (Buffer(*iter).size() > 0)
+ return false;
+ return true;
+ }
+
+ template <typename Iterator>
+ static void validate(Iterator begin, Iterator end)
+ {
+ Iterator iter = begin;
+ for (; iter != end; ++iter)
+ {
+ Buffer buffer(*iter);
+ buffer.data();
+ }
+ }
+
+ template <typename Iterator>
+ static Buffer first(Iterator begin, Iterator end)
+ {
+ Iterator iter = begin;
+ for (; iter != end; ++iter)
+ {
+ Buffer buffer(*iter);
+ if (buffer.size() != 0)
+ return buffer;
+ }
+ return Buffer();
+ }
+
+ native_buffer_type buffers_[max_buffers];
+ std::size_t count_;
+ std::size_t total_buffer_size_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::mutable_buffer>
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const asio::mutable_buffer& buffer_sequence)
+ {
+ init_native_buffer(buffer_, Buffer(buffer_sequence));
+ total_buffer_size_ = buffer_sequence.size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return &buffer_;
+ }
+
+ std::size_t count() const
+ {
+ return 1;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const asio::mutable_buffer& buffer_sequence)
+ {
+ return buffer_sequence.size() == 0;
+ }
+
+ static void validate(const asio::mutable_buffer& buffer_sequence)
+ {
+ buffer_sequence.data();
+ }
+
+ static Buffer first(const asio::mutable_buffer& buffer_sequence)
+ {
+ return Buffer(buffer_sequence);
+ }
+
+private:
+ native_buffer_type buffer_;
+ std::size_t total_buffer_size_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::const_buffer>
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const asio::const_buffer& buffer_sequence)
+ {
+ init_native_buffer(buffer_, Buffer(buffer_sequence));
+ total_buffer_size_ = buffer_sequence.size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return &buffer_;
+ }
+
+ std::size_t count() const
+ {
+ return 1;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const asio::const_buffer& buffer_sequence)
+ {
+ return buffer_sequence.size() == 0;
+ }
+
+ static void validate(const asio::const_buffer& buffer_sequence)
+ {
+ buffer_sequence.data();
+ }
+
+ static Buffer first(const asio::const_buffer& buffer_sequence)
+ {
+ return Buffer(buffer_sequence);
+ }
+
+private:
+ native_buffer_type buffer_;
+ std::size_t total_buffer_size_;
+};
+
+#if !defined(ASIO_NO_DEPRECATED)
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::mutable_buffers_1>
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const asio::mutable_buffers_1& buffer_sequence)
+ {
+ init_native_buffer(buffer_, Buffer(buffer_sequence));
+ total_buffer_size_ = buffer_sequence.size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return &buffer_;
+ }
+
+ std::size_t count() const
+ {
+ return 1;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const asio::mutable_buffers_1& buffer_sequence)
+ {
+ return buffer_sequence.size() == 0;
+ }
+
+ static void validate(const asio::mutable_buffers_1& buffer_sequence)
+ {
+ buffer_sequence.data();
+ }
+
+ static Buffer first(const asio::mutable_buffers_1& buffer_sequence)
+ {
+ return Buffer(buffer_sequence);
+ }
+
+private:
+ native_buffer_type buffer_;
+ std::size_t total_buffer_size_;
+};
+
+template <typename Buffer>
+class buffer_sequence_adapter<Buffer, asio::const_buffers_1>
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const asio::const_buffers_1& buffer_sequence)
+ {
+ init_native_buffer(buffer_, Buffer(buffer_sequence));
+ total_buffer_size_ = buffer_sequence.size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return &buffer_;
+ }
+
+ std::size_t count() const
+ {
+ return 1;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const asio::const_buffers_1& buffer_sequence)
+ {
+ return buffer_sequence.size() == 0;
+ }
+
+ static void validate(const asio::const_buffers_1& buffer_sequence)
+ {
+ buffer_sequence.data();
+ }
+
+ static Buffer first(const asio::const_buffers_1& buffer_sequence)
+ {
+ return Buffer(buffer_sequence);
+ }
+
+private:
+ native_buffer_type buffer_;
+ std::size_t total_buffer_size_;
+};
+
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+template <typename Buffer, typename Elem>
+class buffer_sequence_adapter<Buffer, boost::array<Elem, 2> >
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const boost::array<Elem, 2>& buffer_sequence)
+ {
+ init_native_buffer(buffers_[0], Buffer(buffer_sequence[0]));
+ init_native_buffer(buffers_[1], Buffer(buffer_sequence[1]));
+ total_buffer_size_ = buffer_sequence[0].size() + buffer_sequence[1].size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return buffers_;
+ }
+
+ std::size_t count() const
+ {
+ return 2;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const boost::array<Elem, 2>& buffer_sequence)
+ {
+ return buffer_sequence[0].size() == 0 && buffer_sequence[1].size() == 0;
+ }
+
+ static void validate(const boost::array<Elem, 2>& buffer_sequence)
+ {
+ buffer_sequence[0].data();
+ buffer_sequence[1].data();
+ }
+
+ static Buffer first(const boost::array<Elem, 2>& buffer_sequence)
+ {
+ return Buffer(buffer_sequence[0].size() != 0
+ ? buffer_sequence[0] : buffer_sequence[1]);
+ }
+
+private:
+ native_buffer_type buffers_[2];
+ std::size_t total_buffer_size_;
+};
+
+#if defined(ASIO_HAS_STD_ARRAY)
+
+template <typename Buffer, typename Elem>
+class buffer_sequence_adapter<Buffer, std::array<Elem, 2> >
+ : buffer_sequence_adapter_base
+{
+public:
+ explicit buffer_sequence_adapter(
+ const std::array<Elem, 2>& buffer_sequence)
+ {
+ init_native_buffer(buffers_[0], Buffer(buffer_sequence[0]));
+ init_native_buffer(buffers_[1], Buffer(buffer_sequence[1]));
+ total_buffer_size_ = buffer_sequence[0].size() + buffer_sequence[1].size();
+ }
+
+ native_buffer_type* buffers()
+ {
+ return buffers_;
+ }
+
+ std::size_t count() const
+ {
+ return 2;
+ }
+
+ std::size_t total_size() const
+ {
+ return total_buffer_size_;
+ }
+
+ bool all_empty() const
+ {
+ return total_buffer_size_ == 0;
+ }
+
+ static bool all_empty(const std::array<Elem, 2>& buffer_sequence)
+ {
+ return buffer_sequence[0].size() == 0 && buffer_sequence[1].size() == 0;
+ }
+
+ static void validate(const std::array<Elem, 2>& buffer_sequence)
+ {
+ buffer_sequence[0].data();
+ buffer_sequence[1].data();
+ }
+
+ static Buffer first(const std::array<Elem, 2>& buffer_sequence)
+ {
+ return Buffer(buffer_sequence[0].size() != 0
+ ? buffer_sequence[0] : buffer_sequence[1]);
+ }
+
+private:
+ native_buffer_type buffers_[2];
+ std::size_t total_buffer_size_;
+};
+
+#endif // defined(ASIO_HAS_STD_ARRAY)
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/buffer_sequence_adapter.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP