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1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
2 | // (C) Copyright 2003-2007 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_DIRECT_ADAPTER_HPP_INCLUDED | |
9 | #define BOOST_IOSTREAMS_DETAIL_DIRECT_ADAPTER_HPP_INCLUDED | |
10 | ||
11 | #if defined(_MSC_VER) | |
12 | # pragma once | |
13 | #endif | |
14 | ||
15 | #include <boost/config.hpp> // SFINAE, MSVC, put ptrdiff_t in std. | |
16 | #include <algorithm> // copy, min. | |
17 | #include <cstddef> // ptrdiff_t. | |
18 | #include <boost/detail/workaround.hpp> | |
19 | #include <boost/iostreams/categories.hpp> | |
20 | #include <boost/iostreams/detail/config/limits.hpp> // forwarding. | |
21 | #include <boost/iostreams/detail/config/wide_streams.hpp> // locale. | |
22 | #include <boost/iostreams/detail/double_object.hpp> | |
23 | #include <boost/iostreams/detail/error.hpp> | |
24 | #include <boost/iostreams/detail/ios.hpp> // openmode, seekdir, int types. | |
25 | #include <boost/iostreams/traits.hpp> // mode_of, is_direct. | |
26 | #include <boost/iostreams/operations.hpp> | |
27 | #include <boost/mpl/bool.hpp> | |
28 | #include <boost/mpl/or.hpp> | |
29 | #include <boost/preprocessor/iteration/local.hpp> | |
30 | #include <boost/preprocessor/repetition/enum_binary_params.hpp> | |
31 | #include <boost/preprocessor/repetition/enum_params.hpp> | |
32 | #include <boost/static_assert.hpp> | |
33 | #include <boost/throw_exception.hpp> | |
34 | #include <boost/type_traits/is_convertible.hpp> | |
35 | ||
36 | // Must come last. | |
37 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1 | |
38 | ||
39 | namespace boost { namespace iostreams { namespace detail { | |
40 | ||
41 | //------------------Definition of direct_adapter_base-------------------------// | |
42 | ||
43 | // Put all initialization in base class to faciliate forwarding. | |
44 | template<typename Direct> | |
45 | class direct_adapter_base { | |
46 | public: | |
47 | typedef typename char_type_of<Direct>::type char_type; | |
48 | typedef typename mode_of<Direct>::type mode_type; | |
49 | struct category | |
50 | : mode_type, | |
51 | device_tag, | |
52 | closable_tag | |
53 | #ifndef BOOST_IOSTREAMS_NO_LOCALE | |
54 | , localizable_tag | |
55 | #endif | |
56 | { }; | |
57 | protected: | |
58 | explicit direct_adapter_base(const Direct& d); | |
59 | typedef is_convertible<category, two_sequence> is_double; | |
60 | struct pointers { | |
92f5a8d4 | 61 | pointers() : beg(0), ptr(0), end(0) { } |
7c673cae FG |
62 | char_type *beg, *ptr, *end; |
63 | }; | |
64 | void init_input(mpl::true_); | |
65 | void init_input(mpl::false_) { } | |
66 | void init_output(mpl::true_); | |
67 | void init_output(mpl::false_) { } | |
68 | double_object<pointers, is_double> ptrs_; | |
69 | Direct d_; | |
70 | }; | |
71 | ||
72 | template<typename Direct> | |
73 | class direct_adapter : private direct_adapter_base<Direct> { | |
74 | private: | |
75 | typedef direct_adapter_base<Direct> base_type; | |
76 | typedef typename base_type::pointers pointers; | |
77 | typedef typename base_type::is_double is_double; | |
78 | using base_type::ptrs_; | |
79 | using base_type::d_; | |
80 | public: | |
81 | typedef typename base_type::char_type char_type; | |
82 | typedef typename base_type::category category; | |
83 | ||
84 | // Constructors | |
85 | ||
86 | #if !BOOST_WORKAROUND(BOOST_MSVC, <= 1310) | |
87 | direct_adapter(const Direct& d) : base_type(d) { } | |
88 | direct_adapter(const direct_adapter& d) : base_type(d) { } | |
89 | # define BOOST_PP_LOCAL_LIMITS (1, BOOST_IOSTREAMS_MAX_FORWARDING_ARITY) | |
90 | #else | |
91 | template<typename U> | |
92 | struct is_direct | |
93 | : mpl::or_< | |
94 | is_same<U, direct_adapter<Direct> >, | |
95 | is_same<U, Direct> | |
96 | > | |
97 | { }; | |
98 | template<typename U> | |
99 | direct_adapter(const U& u) | |
100 | : base_type(forward(u, is_direct<U>())) | |
101 | { } | |
102 | # define BOOST_PP_LOCAL_LIMITS (2, BOOST_IOSTREAMS_MAX_FORWARDING_ARITY) | |
103 | #endif | |
104 | ||
105 | #define BOOST_PP_LOCAL_MACRO(n) \ | |
106 | template<BOOST_PP_ENUM_PARAMS(n, typename P)> \ | |
107 | direct_adapter(BOOST_PP_ENUM_BINARY_PARAMS(n, const P, &p)) \ | |
108 | : base_type(Direct(BOOST_PP_ENUM_PARAMS(n, p))) \ | |
109 | { } \ | |
110 | /**/ | |
111 | #include BOOST_PP_LOCAL_ITERATE() | |
112 | #undef BOOST_PP_LOCAL_MACRO | |
113 | ||
114 | // Device interface. | |
115 | ||
116 | std::streamsize read(char_type* s, std::streamsize n); | |
117 | std::streamsize write(const char_type* s, std::streamsize n); | |
118 | std::streampos seek( stream_offset, BOOST_IOS::seekdir, | |
119 | BOOST_IOS::openmode = BOOST_IOS::in | BOOST_IOS::out ); | |
120 | void close(); | |
121 | void close(BOOST_IOS::openmode which); | |
122 | #ifndef BOOST_IOSTREAMS_NO_LOCALE | |
123 | void imbue(const std::locale&); | |
124 | #endif | |
125 | ||
126 | // Direct device access. | |
127 | ||
128 | Direct& operator*() { return d_; } | |
129 | Direct* operator->() { return &d_; } | |
130 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1310) | |
131 | private: | |
132 | template<typename U> | |
133 | static Direct forward(const U& u, mpl::true_) { return u; } | |
134 | template<typename U> | |
135 | static Direct forward(const U& u, mpl::false_) { return Direct(u); } | |
136 | #endif | |
137 | }; | |
138 | ||
139 | //--------------Definition of wrap_direct and unwrap_direct-------------------// | |
140 | ||
141 | template<typename Device> | |
142 | struct wrap_direct_traits | |
143 | : mpl::if_< | |
144 | is_direct<Device>, | |
145 | direct_adapter<Device>, | |
146 | Device | |
147 | > | |
148 | { }; | |
149 | ||
150 | template<typename Device> | |
151 | typename wrap_direct_traits<Device>::type | |
152 | inline wrap_direct(Device dev) | |
153 | { | |
154 | typedef typename wrap_direct_traits<Device>::type type; | |
155 | return type(dev); | |
156 | } | |
157 | ||
158 | template<typename Device> | |
159 | inline Device& unwrap_direct(Device& d) { return d; } | |
160 | ||
161 | template<typename Device> | |
162 | inline Device& unwrap_direct(direct_adapter<Device>& d) { return *d; } | |
163 | ||
164 | //--------------Implementation of direct_adapter_base-------------------------// | |
165 | ||
166 | template<typename Direct> | |
167 | direct_adapter_base<Direct>::direct_adapter_base(const Direct& d) : d_(d) | |
168 | { | |
169 | init_input(is_convertible<category, input>()); | |
170 | init_output(is_convertible<category, output>()); | |
171 | } | |
172 | ||
173 | template<typename Direct> | |
174 | void direct_adapter_base<Direct>::init_input(mpl::true_) | |
175 | { | |
176 | std::pair<char_type*, char_type*> seq = iostreams::input_sequence(d_); | |
177 | ptrs_.first().beg = seq.first; | |
178 | ptrs_.first().ptr = seq.first; | |
179 | ptrs_.first().end = seq.second; | |
180 | } | |
181 | ||
182 | template<typename Direct> | |
183 | void direct_adapter_base<Direct>::init_output(mpl::true_) | |
184 | { | |
185 | std::pair<char_type*, char_type*> seq = iostreams::output_sequence(d_); | |
186 | ptrs_.second().beg = seq.first; | |
187 | ptrs_.second().ptr = seq.first; | |
188 | ptrs_.second().end = seq.second; | |
189 | } | |
190 | ||
191 | //--------------Implementation of direct_adapter------------------------------// | |
192 | ||
193 | template<typename Direct> | |
194 | inline std::streamsize direct_adapter<Direct>::read | |
195 | (char_type* s, std::streamsize n) | |
196 | { | |
197 | using namespace std; | |
198 | pointers& get = ptrs_.first(); | |
199 | std::streamsize avail = | |
200 | static_cast<std::streamsize>(get.end - get.ptr); | |
201 | std::streamsize result = (std::min)(n, avail); | |
202 | std::copy(get.ptr, get.ptr + result, s); | |
203 | get.ptr += result; | |
204 | return result != 0 ? result : -1; | |
205 | } | |
206 | ||
207 | template<typename Direct> | |
208 | inline std::streamsize direct_adapter<Direct>::write | |
209 | (const char_type* s, std::streamsize n) | |
210 | { | |
211 | using namespace std; | |
212 | pointers& put = ptrs_.second(); | |
213 | if (n > static_cast<std::streamsize>(put.end - put.ptr)) | |
214 | boost::throw_exception(write_area_exhausted()); | |
215 | std::copy(s, s + n, put.ptr); | |
216 | put.ptr += n; | |
217 | return n; | |
218 | } | |
219 | ||
220 | template<typename Direct> | |
221 | inline std::streampos direct_adapter<Direct>::seek | |
222 | ( stream_offset off, BOOST_IOS::seekdir way, | |
223 | BOOST_IOS::openmode which ) | |
224 | { | |
225 | using namespace std; | |
226 | pointers& get = ptrs_.first(); | |
227 | pointers& put = ptrs_.second(); | |
228 | if (way == BOOST_IOS::cur && get.ptr != put.ptr) | |
229 | boost::throw_exception(bad_seek()); | |
230 | ptrdiff_t next = 0; | |
231 | if ((which & BOOST_IOS::in) || !is_double::value) { | |
232 | if (way == BOOST_IOS::beg) | |
233 | next = off; | |
234 | else if (way == BOOST_IOS::cur) | |
235 | next = get.ptr - get.beg + off; | |
236 | else | |
237 | next = get.end - get.beg + off; | |
238 | if (next >= 0 && next <= get.end - get.beg) | |
239 | get.ptr = get.beg + next; | |
240 | else | |
241 | boost::throw_exception(bad_seek()); | |
242 | } | |
243 | if ((which & BOOST_IOS::out) && is_double::value) { | |
244 | if (way == BOOST_IOS::beg) | |
245 | next = off; | |
246 | else if (way == BOOST_IOS::cur) | |
247 | next = put.ptr - put.beg + off; | |
248 | else | |
249 | next = put.end - put.beg + off; | |
250 | if (next >= 0 && next <= put.end - put.beg) | |
251 | put.ptr = put.beg + next; | |
252 | else | |
253 | boost::throw_exception(bad_seek()); | |
254 | } | |
255 | return offset_to_position(next); | |
256 | } | |
257 | ||
258 | template<typename Direct> | |
259 | void direct_adapter<Direct>::close() | |
260 | { | |
261 | BOOST_STATIC_ASSERT((!is_convertible<category, two_sequence>::value)); | |
262 | detail::close_all(d_); | |
263 | } | |
264 | ||
265 | template<typename Direct> | |
266 | void direct_adapter<Direct>::close(BOOST_IOS::openmode which) | |
267 | { | |
268 | BOOST_STATIC_ASSERT((is_convertible<category, two_sequence>::value)); | |
269 | boost::iostreams::close(d_, which); | |
270 | } | |
271 | ||
272 | #ifndef BOOST_IOSTREAMS_NO_LOCALE | |
273 | template<typename Direct> | |
274 | void direct_adapter<Direct>::imbue(const std::locale& loc) | |
275 | { boost::iostreams::imbue(d_, loc); } | |
276 | #endif | |
277 | ||
278 | } } } // End namespaces detail, iostreams, boost. | |
279 | ||
280 | #include <boost/iostreams/detail/config/enable_warnings.hpp> | |
281 | ||
282 | #endif // #ifndef BOOST_IOSTREAMS_DETAIL_DIRECT_ADAPTER_HPP_INCLUDED |