1// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
2// (C) Copyright 2005-2007 Jonathan Turkanis
3// Distributed under the Boost Software License, Version 1.0. (See accompanying
4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
5
6// See http://www.boost.org/libs/iostreams for documentation.
7
8#ifndef BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
9#define BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
10
11#include <algorithm> // min.
12#include <cstddef> // size_t
13#include <string> // char_traits
14#include <boost/iostreams/categories.hpp>
15#include <boost/iostreams/detail/char_traits.hpp>
16#include <boost/iostreams/detail/ios.hpp> // streamsize.
17
18namespace boost { namespace iostreams { namespace detail {
19
20template<typename Ch>
21class counted_array_source {
22public:
23 typedef Ch char_type;
24 typedef source_tag category;
25 counted_array_source(const Ch* buf, std::streamsize size)
26 : buf_(buf), ptr_(0), end_(size)
27 { }
28 std::streamsize read(Ch* s, std::streamsize n)
29 {
30 using namespace std;
31 streamsize result = (std::min)(a: n, b: end_ - ptr_);
32 char_traits<char_type>::copy(
33 s,
34 buf_ + ptr_,
35 static_cast<size_t>(result)
36 );
37 ptr_ += result;
38 return result;
39 }
40 std::streamsize count() const { return ptr_; }
41private:
42 const Ch* buf_;
43 std::streamsize ptr_, end_;
44};
45
46template<typename Ch>
47struct counted_array_sink {
48public:
49 typedef Ch char_type;
50 typedef sink_tag category;
51 counted_array_sink(Ch* buf, std::streamsize size)
52 : buf_(buf), ptr_(0), end_(size)
53 { }
54 std::streamsize write(const Ch* s, std::streamsize n)
55 {
56 using namespace std;
57 std::streamsize result = (std::min)(a: n, b: end_ - ptr_);
58 char_traits<char_type>::copy(
59 buf_ + ptr_,
60 s,
61 static_cast<size_t>(result)
62 );
63 ptr_ += result;
64 return result;
65 }
66 std::streamsize count() const { return ptr_; }
67private:
68 Ch* buf_;
69 std::streamsize ptr_, end_;
70};
71
72} } } // End namespaces iostreams, boost.
73
74#endif // #ifndef BOOST_IOSTREAMS_DETAIL_COUNTED_ARRAY_HPP_INCLUDED
75

source code of boost/libs/iostreams/include/boost/iostreams/detail/counted_array.hpp