1 //
2 // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot 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_CORE_DETAIL_BUFFER_HPP
11 #define BOOST_BEAST_CORE_DETAIL_BUFFER_HPP
12
13 #include <boost/beast/core/error.hpp>
14 #include <boost/asio/buffer.hpp>
15 #include <boost/optional.hpp>
16 #include <stdexcept>
17
18 namespace boost {
19 namespace beast {
20 namespace detail {
21
22 template<
23 class DynamicBuffer,
24 class ErrorValue>
25 auto
dynamic_buffer_prepare_noexcept(DynamicBuffer & buffer,std::size_t size,error_code & ec,ErrorValue ev)26 dynamic_buffer_prepare_noexcept(
27 DynamicBuffer& buffer,
28 std::size_t size,
29 error_code& ec,
30 ErrorValue ev) ->
31 boost::optional<typename
32 DynamicBuffer::mutable_buffers_type>
33 {
34 if(buffer.max_size() - buffer.size() < size)
35 {
36 // length error
37 ec = ev;
38 return boost::none;
39 }
40 boost::optional<typename
41 DynamicBuffer::mutable_buffers_type> result;
42 result.emplace(buffer.prepare(size));
43 ec = {};
44 return result;
45 }
46
47 template<
48 class DynamicBuffer,
49 class ErrorValue>
50 auto
dynamic_buffer_prepare(DynamicBuffer & buffer,std::size_t size,error_code & ec,ErrorValue ev)51 dynamic_buffer_prepare(
52 DynamicBuffer& buffer,
53 std::size_t size,
54 error_code& ec,
55 ErrorValue ev) ->
56 boost::optional<typename
57 DynamicBuffer::mutable_buffers_type>
58 {
59 #ifndef BOOST_NO_EXCEPTIONS
60 try
61 {
62 boost::optional<typename
63 DynamicBuffer::mutable_buffers_type> result;
64 result.emplace(buffer.prepare(size));
65 ec = {};
66 return result;
67 }
68 catch(std::length_error const&)
69 {
70 ec = ev;
71 }
72 return boost::none;
73
74 #else
75 return dynamic_buffer_prepare_noexcept(
76 buffer, size, ec, ev);
77 #endif
78 }
79
80 } // detail
81 } // beast
82 } // boost
83
84 #endif
85