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