ceph/src/boost/boost/beast/core/detail/impl/temporary_buffer.ipp

   1 //
   2 // Copyright (c) 2019 Damian Jarek(damian.jarek93@gmail.com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9
  10 #ifndef BOOST_BEAST_DETAIL_IMPL_TEMPORARY_BUFFER_IPP
  11 #define BOOST_BEAST_DETAIL_IMPL_TEMPORARY_BUFFER_IPP
  12
  13 #include <boost/beast/core/detail/temporary_buffer.hpp>
  14 #include <boost/beast/core/detail/clamp.hpp>
  15 #include <boost/core/exchange.hpp>
  16 #include <boost/assert.hpp>
  17 #include <memory>
  18 #include <cstring>
  19
  20 namespace boost {
  21 namespace beast {
  22 namespace detail {
  23
  24 void
  25 temporary_buffer::
  26 append(string_view s)
  27 {
  28     grow(s.size());
  29     unchecked_append(s);
  30 }
  31
  32 void
  33 temporary_buffer::
  34 append(string_view s1, string_view s2)
  35 {
  36     grow(s1.size() + s2.size());
  37     unchecked_append(s1);
  38     unchecked_append(s2);
  39 }
  40
  41 void
  42 temporary_buffer::
  43 unchecked_append(string_view s)
  44 {
  45     auto n = s.size();
  46     std::memcpy(&data_[size_], s.data(), n);
  47     size_ += n;
  48 }
  49
  50 void
  51 temporary_buffer::
  52 grow(std::size_t n)
  53 {
  54     if (capacity_ - size_ >= n)
  55         return;
  56
  57     auto const capacity = (n + size_) * 2u;
  58     BOOST_ASSERT(! detail::sum_exceeds(
  59         n, size_, capacity));
  60     char* const p = new char[capacity];
  61     std::memcpy(p, data_, size_);
  62     deallocate(boost::exchange(data_, p));
  63     capacity_ = capacity;
  64 }
  65 } // detail
  66 } // beast
  67 } // boost
  68
  69 #endif