[857] | 1 | // (C) Copyright Jonathan Turkanis 2003.
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 4 |
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| 5 | // See http://www.boost.org/libs/iostreams for documentation.
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| 6 |
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| 7 | // Inspired by fdstream.hpp, (C) Copyright Nicolai M. Josuttis 2001,
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| 8 | // available at http://www.josuttis.com/cppcode/fdstream.html.
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| 9 |
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| 10 | #ifndef BOOST_IOSTREAMS_FILE_DESCRIPTOR_HPP_INCLUDED
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| 11 | #define BOOST_IOSTREAMS_FILE_DESCRIPTOR_HPP_INCLUDED
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| 12 |
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| 13 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 14 | # pragma once
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| 15 | #endif
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| 16 |
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| 17 | #include <string> // file pathnames.
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| 18 | #include <boost/cstdint.hpp> // intmax_t.
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| 19 | #include <boost/iostreams/categories.hpp> // tags.
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| 20 | #include <boost/iostreams/detail/config/auto_link.hpp>
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| 21 | #include <boost/iostreams/detail/config/dyn_link.hpp>
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| 22 | #include <boost/iostreams/detail/config/windows_posix.hpp>
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| 23 | #include <boost/iostreams/detail/ios.hpp> // openmode, seekdir, int types.
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| 24 | #include <boost/iostreams/positioning.hpp>
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| 25 | #include <boost/shared_ptr.hpp>
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| 26 |
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| 27 | // Must come last.
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| 28 | #include <boost/config/abi_prefix.hpp>
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| 29 |
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| 30 | namespace boost { namespace iostreams {
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| 31 |
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| 32 | class BOOST_IOSTREAMS_DECL file_descriptor {
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| 33 | public:
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| 34 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 35 | typedef void* handle_type;
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| 36 | #endif
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| 37 | typedef char char_type;
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| 38 | struct category
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| 39 | : seekable_device_tag,
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| 40 | closable_tag
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| 41 | { };
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| 42 | file_descriptor() : pimpl_(new impl) { }
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| 43 | explicit file_descriptor(int fd, bool close_on_exit = false)
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| 44 | : pimpl_(new impl(fd, close_on_exit))
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| 45 | { }
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| 46 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 47 | explicit file_descriptor(handle_type handle, bool close_on_exit = false)
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| 48 | : pimpl_(new impl(handle, close_on_exit))
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| 49 | { }
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| 50 | #endif
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| 51 | explicit file_descriptor( const std::string& path,
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| 52 | BOOST_IOS::openmode mode =
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| 53 | BOOST_IOS::in | BOOST_IOS::out,
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| 54 | BOOST_IOS::openmode base_mode =
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| 55 | BOOST_IOS::in | BOOST_IOS::out )
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| 56 | : pimpl_(new impl)
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| 57 | { open(path, mode, base_mode); }
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| 58 | void open( const std::string& path,
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| 59 | BOOST_IOS::openmode =
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| 60 | BOOST_IOS::in | BOOST_IOS::out,
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| 61 | BOOST_IOS::openmode base_mode =
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| 62 | BOOST_IOS::in | BOOST_IOS::out );
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| 63 | bool is_open() const { return pimpl_->flags_ != 0; }
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| 64 | std::streamsize read(char_type* s, std::streamsize n);
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| 65 | std::streamsize write(const char_type* s, std::streamsize n);
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| 66 | std::streampos seek(stream_offset off, BOOST_IOS::seekdir way);
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| 67 | void close();
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| 68 | private:
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| 69 | struct impl {
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| 70 | impl() : fd_(-1), flags_(0) { }
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| 71 | impl(int fd, bool close_on_exit)
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| 72 | : fd_(fd), flags_(0)
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| 73 | { if (close_on_exit) flags_ |= impl::close_on_exit; }
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| 74 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 75 | impl(handle_type handle, bool close_on_exit)
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| 76 | : handle_(handle), flags_(has_handle)
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| 77 | { if (close_on_exit) flags_ |= impl::close_on_exit; }
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| 78 | #endif
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| 79 | ~impl() {
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| 80 | if (flags_ & close_on_exit) close_impl(*this);
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| 81 | }
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| 82 | enum flags {
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| 83 | close_on_exit = 1,
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| 84 | has_handle = 2,
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| 85 | append = 4
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| 86 | };
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| 87 | int fd_;
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| 88 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 89 | handle_type handle_;
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| 90 | #endif
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| 91 | int flags_;
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| 92 | };
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| 93 | friend struct impl;
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| 94 |
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| 95 | static void close_impl(impl&);
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| 96 |
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| 97 | shared_ptr<impl> pimpl_;
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| 98 | };
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| 99 |
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| 100 | struct file_descriptor_source : private file_descriptor {
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| 101 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 102 | typedef void* handle_type;
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| 103 | #endif
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| 104 | typedef char char_type;
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| 105 | struct category : public source_tag, closable_tag { };
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| 106 | using file_descriptor::read;
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| 107 | using file_descriptor::open;
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| 108 | using file_descriptor::is_open;
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| 109 | using file_descriptor::close;
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| 110 | file_descriptor_source() { }
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| 111 | explicit file_descriptor_source(int fd, bool close_on_exit = false)
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| 112 | : file_descriptor(fd, close_on_exit)
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| 113 | { }
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| 114 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 115 | explicit file_descriptor_source( handle_type handle,
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| 116 | bool close_on_exit = false )
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| 117 | : file_descriptor(handle, close_on_exit)
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| 118 | { }
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| 119 | #endif
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| 120 | explicit file_descriptor_source( const std::string& path,
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| 121 | BOOST_IOS::openmode m = BOOST_IOS::in )
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| 122 | : file_descriptor(path, m & ~BOOST_IOS::out, BOOST_IOS::in)
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| 123 | { }
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| 124 | };
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| 125 |
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| 126 | struct file_descriptor_sink : private file_descriptor {
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| 127 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 128 | typedef void* handle_type;
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| 129 | #endif
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| 130 | typedef char char_type;
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| 131 | struct category : public sink_tag, closable_tag { };
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| 132 | using file_descriptor::write;
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| 133 | using file_descriptor::open;
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| 134 | using file_descriptor::is_open;
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| 135 | using file_descriptor::close;
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| 136 | file_descriptor_sink() { }
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| 137 | explicit file_descriptor_sink(int fd, bool close_on_exit = false)
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| 138 | : file_descriptor(fd, close_on_exit)
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| 139 | { }
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| 140 | #ifdef BOOST_IOSTREAMS_WINDOWS
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| 141 | explicit file_descriptor_sink( handle_type handle,
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| 142 | bool close_on_exit = false )
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| 143 | : file_descriptor(handle, close_on_exit)
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| 144 | { }
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| 145 | #endif
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| 146 | explicit file_descriptor_sink( const std::string& path,
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| 147 | BOOST_IOS::openmode m = BOOST_IOS::out )
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| 148 | : file_descriptor(path, m & ~BOOST_IOS::in, BOOST_IOS::out)
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| 149 | { }
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| 150 | };
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| 151 |
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| 152 | } } // End namespaces iostreams, boost.
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| 153 |
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| 154 | #include <boost/config/abi_suffix.hpp> // pops abi_suffix.hpp pragmas
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| 155 |
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| 156 | #endif // #ifndef BOOST_IOSTREAMS_FILE_DESCRIPTOR_HPP_INCLUDED
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