//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail 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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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_IMPL_FLAT_STATIC_BUFFER_IPP
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#define BOOST_BEAST_IMPL_FLAT_STATIC_BUFFER_IPP
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#include <boost/beast/core/flat_static_buffer.hpp>
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#include <boost/throw_exception.hpp>
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#include <algorithm>
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#include <cstring>
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#include <iterator>
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#include <memory>
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#include <stdexcept>
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namespace boost {
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namespace beast {
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/* Layout:
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begin_ in_ out_ last_ end_
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|<------->|<---------->|<---------->|<------->|
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| readable | writable |
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*/
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void
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flat_static_buffer_base::
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clear() noexcept
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{
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in_ = begin_;
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out_ = begin_;
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last_ = begin_;
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}
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auto
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flat_static_buffer_base::
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prepare(std::size_t n) ->
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mutable_buffers_type
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{
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if(n <= dist(out_, end_))
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{
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last_ = out_ + n;
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return {out_, n};
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}
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auto const len = size();
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if(n > capacity() - len)
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BOOST_THROW_EXCEPTION(std::length_error{
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"buffer overflow"});
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if(len > 0)
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std::memmove(begin_, in_, len);
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in_ = begin_;
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out_ = in_ + len;
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last_ = out_ + n;
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return {out_, n};
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}
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void
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flat_static_buffer_base::
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consume(std::size_t n) noexcept
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{
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if(n >= size())
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{
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in_ = begin_;
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out_ = in_;
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return;
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}
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in_ += n;
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}
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void
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flat_static_buffer_base::
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reset(void* p, std::size_t n) noexcept
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{
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begin_ = static_cast<char*>(p);
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in_ = begin_;
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out_ = begin_;
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last_ = begin_;
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end_ = begin_ + n;
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}
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} // beast
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} // boost
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#endif
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