annotate DEPENDENCIES/generic/include/boost/iostreams/detail/streambuf/direct_streambuf.hpp @ 133:4acb5d8d80b6 tip

Don't fail environmental check if README.md exists (but .txt and no-suffix don't)
author Chris Cannam
date Tue, 30 Jul 2019 12:25:44 +0100
parents 2665513ce2d3
children
rev   line source
Chris@16 1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16 2 // (C) Copyright 2003-2007 Jonathan Turkanis
Chris@16 3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16 4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16 5
Chris@16 6 // See http://www.boost.org/libs/iostreams for documentation.
Chris@16 7
Chris@16 8 #ifndef BOOST_IOSTREAMS_DETAIL_DIRECT_STREAMBUF_HPP_INCLUDED
Chris@16 9 #define BOOST_IOSTREAMS_DETAIL_DIRECT_STREAMBUF_HPP_INCLUDED
Chris@16 10
Chris@16 11 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16 12 # pragma once
Chris@16 13 #endif
Chris@16 14
Chris@16 15 #include <boost/assert.hpp>
Chris@16 16 #include <cstddef>
Chris@16 17 #include <typeinfo>
Chris@16 18 #include <utility> // pair.
Chris@16 19 #include <boost/config.hpp> // BOOST_DEDUCED_TYPENAME,
Chris@16 20 #include <boost/iostreams/detail/char_traits.hpp> // member template friends.
Chris@16 21 #include <boost/iostreams/detail/config/wide_streams.hpp>
Chris@16 22 #include <boost/iostreams/detail/error.hpp>
Chris@16 23 #include <boost/iostreams/detail/execute.hpp>
Chris@16 24 #include <boost/iostreams/detail/functional.hpp>
Chris@16 25 #include <boost/iostreams/detail/ios.hpp>
Chris@16 26 #include <boost/iostreams/detail/optional.hpp>
Chris@16 27 #include <boost/iostreams/detail/streambuf.hpp>
Chris@16 28 #include <boost/iostreams/detail/streambuf/linked_streambuf.hpp>
Chris@16 29 #include <boost/iostreams/operations.hpp>
Chris@16 30 #include <boost/iostreams/positioning.hpp>
Chris@16 31 #include <boost/iostreams/traits.hpp>
Chris@16 32 #include <boost/throw_exception.hpp>
Chris@16 33
Chris@16 34 // Must come last.
Chris@16 35 #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
Chris@16 36
Chris@16 37 namespace boost { namespace iostreams {
Chris@16 38
Chris@16 39 namespace detail {
Chris@16 40
Chris@16 41 template< typename T,
Chris@16 42 typename Tr =
Chris@16 43 BOOST_IOSTREAMS_CHAR_TRAITS(
Chris@16 44 BOOST_DEDUCED_TYPENAME char_type_of<T>::type
Chris@16 45 ) >
Chris@16 46 class direct_streambuf
Chris@16 47 : public linked_streambuf<BOOST_DEDUCED_TYPENAME char_type_of<T>::type, Tr>
Chris@16 48 {
Chris@16 49 public:
Chris@16 50 typedef typename char_type_of<T>::type char_type;
Chris@16 51 BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
Chris@16 52 private:
Chris@16 53 typedef linked_streambuf<char_type, traits_type> base_type;
Chris@16 54 typedef typename category_of<T>::type category;
Chris@16 55 typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(
Chris@16 56 char_type, traits_type
Chris@16 57 ) streambuf_type;
Chris@16 58 public: // stream needs access.
Chris@16 59 void open(const T& t, std::streamsize buffer_size,
Chris@16 60 std::streamsize pback_size);
Chris@16 61 bool is_open() const;
Chris@16 62 void close();
Chris@16 63 bool auto_close() const { return auto_close_; }
Chris@16 64 void set_auto_close(bool close) { auto_close_ = close; }
Chris@16 65 bool strict_sync() { return true; }
Chris@16 66
Chris@16 67 // Declared in linked_streambuf.
Chris@16 68 T* component() { return storage_.get(); }
Chris@16 69 protected:
Chris@16 70 #if !BOOST_WORKAROUND(__GNUC__, == 2)
Chris@16 71 BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base_type)
Chris@16 72 #endif
Chris@16 73 direct_streambuf();
Chris@16 74
Chris@16 75 //--------------Virtual functions-----------------------------------------//
Chris@16 76
Chris@16 77 // Declared in linked_streambuf.
Chris@16 78 void close_impl(BOOST_IOS::openmode m);
Chris@16 79 const std::type_info& component_type() const { return typeid(T); }
Chris@16 80 void* component_impl() { return component(); }
Chris@16 81 #ifdef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES
Chris@16 82 public:
Chris@16 83 #endif
Chris@16 84
Chris@16 85 // Declared in basic_streambuf.
Chris@16 86 int_type underflow();
Chris@16 87 int_type pbackfail(int_type c);
Chris@16 88 int_type overflow(int_type c);
Chris@16 89 pos_type seekoff( off_type off, BOOST_IOS::seekdir way,
Chris@16 90 BOOST_IOS::openmode which );
Chris@16 91 pos_type seekpos(pos_type sp, BOOST_IOS::openmode which);
Chris@16 92 private:
Chris@16 93 pos_type seek_impl( stream_offset off, BOOST_IOS::seekdir way,
Chris@16 94 BOOST_IOS::openmode which );
Chris@16 95 void init_input(any_tag) { }
Chris@16 96 void init_input(input);
Chris@16 97 void init_output(any_tag) { }
Chris@16 98 void init_output(output);
Chris@16 99 void init_get_area();
Chris@16 100 void init_put_area();
Chris@16 101 bool one_head() const;
Chris@16 102 bool two_head() const;
Chris@16 103 optional<T> storage_;
Chris@16 104 char_type *ibeg_, *iend_, *obeg_, *oend_;
Chris@16 105 bool auto_close_;
Chris@16 106 };
Chris@16 107
Chris@16 108 //------------------Implementation of direct_streambuf------------------------//
Chris@16 109
Chris@16 110 template<typename T, typename Tr>
Chris@16 111 direct_streambuf<T, Tr>::direct_streambuf()
Chris@16 112 : ibeg_(0), iend_(0), obeg_(0), oend_(0), auto_close_(true)
Chris@16 113 { this->set_true_eof(true); }
Chris@16 114
Chris@16 115 template<typename T, typename Tr>
Chris@16 116 void direct_streambuf<T, Tr>::open
Chris@16 117 (const T& t, std::streamsize, std::streamsize)
Chris@16 118 {
Chris@16 119 storage_.reset(t);
Chris@16 120 init_input(category());
Chris@16 121 init_output(category());
Chris@16 122 setg(0, 0, 0);
Chris@16 123 setp(0, 0);
Chris@16 124 this->set_needs_close();
Chris@16 125 }
Chris@16 126
Chris@16 127 template<typename T, typename Tr>
Chris@16 128 bool direct_streambuf<T, Tr>::is_open() const
Chris@16 129 { return ibeg_ != 0 || obeg_ != 0; }
Chris@16 130
Chris@16 131 template<typename T, typename Tr>
Chris@16 132 void direct_streambuf<T, Tr>::close()
Chris@16 133 {
Chris@16 134 base_type* self = this;
Chris@16 135 detail::execute_all( detail::call_member_close(*self, BOOST_IOS::in),
Chris@16 136 detail::call_member_close(*self, BOOST_IOS::out),
Chris@16 137 detail::call_reset(storage_) );
Chris@16 138 }
Chris@16 139
Chris@16 140 template<typename T, typename Tr>
Chris@16 141 typename direct_streambuf<T, Tr>::int_type
Chris@16 142 direct_streambuf<T, Tr>::underflow()
Chris@16 143 {
Chris@16 144 if (!ibeg_)
Chris@16 145 boost::throw_exception(cant_read());
Chris@16 146 if (!gptr())
Chris@16 147 init_get_area();
Chris@16 148 return gptr() != iend_ ?
Chris@16 149 traits_type::to_int_type(*gptr()) :
Chris@16 150 traits_type::eof();
Chris@16 151 }
Chris@16 152
Chris@16 153 template<typename T, typename Tr>
Chris@16 154 typename direct_streambuf<T, Tr>::int_type
Chris@16 155 direct_streambuf<T, Tr>::pbackfail(int_type c)
Chris@16 156 {
Chris@16 157 using namespace std;
Chris@16 158 if (!ibeg_)
Chris@16 159 boost::throw_exception(cant_read());
Chris@16 160 if (gptr() != 0 && gptr() != ibeg_) {
Chris@16 161 gbump(-1);
Chris@16 162 if (!traits_type::eq_int_type(c, traits_type::eof()))
Chris@16 163 *gptr() = traits_type::to_char_type(c);
Chris@16 164 return traits_type::not_eof(c);
Chris@16 165 }
Chris@16 166 boost::throw_exception(bad_putback());
Chris@16 167 }
Chris@16 168
Chris@16 169 template<typename T, typename Tr>
Chris@16 170 typename direct_streambuf<T, Tr>::int_type
Chris@16 171 direct_streambuf<T, Tr>::overflow(int_type c)
Chris@16 172 {
Chris@16 173 using namespace std;
Chris@16 174 if (!obeg_)
Chris@16 175 boost::throw_exception(BOOST_IOSTREAMS_FAILURE("no write access"));
Chris@16 176 if (!pptr()) init_put_area();
Chris@16 177 if (!traits_type::eq_int_type(c, traits_type::eof())) {
Chris@16 178 if (pptr() == oend_)
Chris@16 179 boost::throw_exception(
Chris@16 180 BOOST_IOSTREAMS_FAILURE("write area exhausted")
Chris@16 181 );
Chris@16 182 *pptr() = traits_type::to_char_type(c);
Chris@16 183 pbump(1);
Chris@16 184 return c;
Chris@16 185 }
Chris@16 186 return traits_type::not_eof(c);
Chris@16 187 }
Chris@16 188
Chris@16 189 template<typename T, typename Tr>
Chris@16 190 inline typename direct_streambuf<T, Tr>::pos_type
Chris@16 191 direct_streambuf<T, Tr>::seekoff
Chris@16 192 (off_type off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
Chris@16 193 { return seek_impl(off, way, which); }
Chris@16 194
Chris@16 195 template<typename T, typename Tr>
Chris@16 196 inline typename direct_streambuf<T, Tr>::pos_type
Chris@16 197 direct_streambuf<T, Tr>::seekpos
Chris@16 198 (pos_type sp, BOOST_IOS::openmode which)
Chris@16 199 {
Chris@16 200 return seek_impl(position_to_offset(sp), BOOST_IOS::beg, which);
Chris@16 201 }
Chris@16 202
Chris@16 203 template<typename T, typename Tr>
Chris@16 204 void direct_streambuf<T, Tr>::close_impl(BOOST_IOS::openmode which)
Chris@16 205 {
Chris@16 206 if (which == BOOST_IOS::in && ibeg_ != 0) {
Chris@16 207 setg(0, 0, 0);
Chris@16 208 ibeg_ = iend_ = 0;
Chris@16 209 }
Chris@16 210 if (which == BOOST_IOS::out && obeg_ != 0) {
Chris@16 211 sync();
Chris@16 212 setp(0, 0);
Chris@16 213 obeg_ = oend_ = 0;
Chris@16 214 }
Chris@16 215 boost::iostreams::close(*storage_, which);
Chris@16 216 }
Chris@16 217
Chris@16 218 template<typename T, typename Tr>
Chris@16 219 typename direct_streambuf<T, Tr>::pos_type direct_streambuf<T, Tr>::seek_impl
Chris@16 220 (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
Chris@16 221 {
Chris@16 222 using namespace std;
Chris@16 223 BOOST_IOS::openmode both = BOOST_IOS::in | BOOST_IOS::out;
Chris@16 224 if (two_head() && (which & both) == both)
Chris@16 225 boost::throw_exception(bad_seek());
Chris@16 226 stream_offset result = -1;
Chris@16 227 bool one = one_head();
Chris@16 228 if (one && (pptr() != 0 || gptr()== 0))
Chris@16 229 init_get_area(); // Switch to input mode, for code reuse.
Chris@16 230 if (one || ((which & BOOST_IOS::in) != 0 && ibeg_ != 0)) {
Chris@16 231 if (!gptr()) setg(ibeg_, ibeg_, iend_);
Chris@16 232 ptrdiff_t next = 0;
Chris@16 233 switch (way) {
Chris@16 234 case BOOST_IOS::beg: next = off; break;
Chris@16 235 case BOOST_IOS::cur: next = (gptr() - ibeg_) + off; break;
Chris@16 236 case BOOST_IOS::end: next = (iend_ - ibeg_) + off; break;
Chris@16 237 default: BOOST_ASSERT(0);
Chris@16 238 }
Chris@16 239 if (next < 0 || next > (iend_ - ibeg_))
Chris@16 240 boost::throw_exception(bad_seek());
Chris@16 241 setg(ibeg_, ibeg_ + next, iend_);
Chris@16 242 result = next;
Chris@16 243 }
Chris@16 244 if (!one && (which & BOOST_IOS::out) != 0 && obeg_ != 0) {
Chris@16 245 if (!pptr()) setp(obeg_, oend_);
Chris@16 246 ptrdiff_t next = 0;
Chris@16 247 switch (way) {
Chris@16 248 case BOOST_IOS::beg: next = off; break;
Chris@16 249 case BOOST_IOS::cur: next = (pptr() - obeg_) + off; break;
Chris@16 250 case BOOST_IOS::end: next = (oend_ - obeg_) + off; break;
Chris@16 251 default: BOOST_ASSERT(0);
Chris@16 252 }
Chris@16 253 if (next < 0 || next > (oend_ - obeg_))
Chris@16 254 boost::throw_exception(bad_seek());
Chris@16 255 pbump(static_cast<int>(next - (pptr() - obeg_)));
Chris@16 256 result = next;
Chris@16 257 }
Chris@16 258 return offset_to_position(result);
Chris@16 259 }
Chris@16 260
Chris@16 261 template<typename T, typename Tr>
Chris@16 262 void direct_streambuf<T, Tr>::init_input(input)
Chris@16 263 {
Chris@16 264 std::pair<char_type*, char_type*> p = input_sequence(*storage_);
Chris@16 265 ibeg_ = p.first;
Chris@16 266 iend_ = p.second;
Chris@16 267 }
Chris@16 268
Chris@16 269 template<typename T, typename Tr>
Chris@16 270 void direct_streambuf<T, Tr>::init_output(output)
Chris@16 271 {
Chris@16 272 std::pair<char_type*, char_type*> p = output_sequence(*storage_);
Chris@16 273 obeg_ = p.first;
Chris@16 274 oend_ = p.second;
Chris@16 275 }
Chris@16 276
Chris@16 277 template<typename T, typename Tr>
Chris@16 278 void direct_streambuf<T, Tr>::init_get_area()
Chris@16 279 {
Chris@16 280 setg(ibeg_, ibeg_, iend_);
Chris@16 281 if (one_head() && pptr()) {
Chris@16 282 gbump(static_cast<int>(pptr() - obeg_));
Chris@16 283 setp(0, 0);
Chris@16 284 }
Chris@16 285 }
Chris@16 286
Chris@16 287 template<typename T, typename Tr>
Chris@16 288 void direct_streambuf<T, Tr>::init_put_area()
Chris@16 289 {
Chris@16 290 setp(obeg_, oend_);
Chris@16 291 if (one_head() && gptr()) {
Chris@16 292 pbump(static_cast<int>(gptr() - ibeg_));
Chris@16 293 setg(0, 0, 0);
Chris@16 294 }
Chris@16 295 }
Chris@16 296
Chris@16 297 template<typename T, typename Tr>
Chris@16 298 inline bool direct_streambuf<T, Tr>::one_head() const
Chris@16 299 { return ibeg_ && obeg_ && ibeg_ == obeg_; }
Chris@16 300
Chris@16 301 template<typename T, typename Tr>
Chris@16 302 inline bool direct_streambuf<T, Tr>::two_head() const
Chris@16 303 { return ibeg_ && obeg_ && ibeg_ != obeg_; }
Chris@16 304
Chris@16 305 //----------------------------------------------------------------------------//
Chris@16 306
Chris@16 307 } // End namespace detail.
Chris@16 308
Chris@16 309 } } // End namespaces iostreams, boost.
Chris@16 310
Chris@16 311 #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
Chris@16 312
Chris@16 313 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_DIRECT_STREAMBUF_HPP_INCLUDED