[29] | 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 | // Define BOOST_IOSTREAMS_SOURCE so that <boost/iostreams/detail/config.hpp> |
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| 11 | // knows that we are building the library (possibly exporting code), rather |
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| 12 | // than using it (possibly importing code). |
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| 13 | #define BOOST_IOSTREAMS_SOURCE |
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| 14 | |
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| 15 | #include <boost/config.hpp> // BOOST_JOIN |
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| 16 | #include <boost/iostreams/detail/error.hpp> |
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| 17 | #include <boost/iostreams/detail/config/dyn_link.hpp> |
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| 18 | #include <boost/iostreams/detail/config/windows_posix.hpp> |
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| 19 | #include <boost/iostreams/detail/ios.hpp> // openmodes, failure. |
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| 20 | #include <boost/iostreams/device/file_descriptor.hpp> |
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| 21 | #include <boost/integer_traits.hpp> |
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| 22 | |
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| 23 | // OS-specific headers for low-level i/o. |
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| 24 | |
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| 25 | #include <cassert> |
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| 26 | #include <cstdio> // SEEK_SET, etc. |
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| 27 | #include <errno.h> |
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| 28 | #include <fcntl.h> // file opening flags. |
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| 29 | #include <sys/stat.h> // file access permissions. |
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| 30 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 31 | # include <io.h> // low-level file i/o. |
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| 32 | # define WINDOWS_LEAN_AND_MEAN |
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| 33 | # include <windows.h> |
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| 34 | #else |
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| 35 | # include <sys/types.h> // mode_t. |
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| 36 | # include <unistd.h> // low-level file i/o. |
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| 37 | #endif |
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| 38 | |
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| 39 | // Names of runtime library routines vary. |
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| 40 | #if defined(__BORLANDC__) |
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| 41 | # define BOOST_RTL(x) BOOST_JOIN(_rtl_, x) |
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| 42 | #else |
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| 43 | # if defined(BOOST_IOSTREAMS_WINDOWS) && !defined(__CYGWIN__) |
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| 44 | # define BOOST_RTL(x) BOOST_JOIN(_, x) |
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| 45 | # else |
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| 46 | # define BOOST_RTL(x) ::x |
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| 47 | # endif |
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| 48 | #endif |
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| 49 | |
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| 50 | namespace boost { namespace iostreams { |
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| 51 | |
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| 52 | //------------------Implementation of file_descriptor-------------------------// |
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| 53 | |
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| 54 | void file_descriptor::open |
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| 55 | ( const std::string& path, BOOST_IOS::openmode m, |
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| 56 | BOOST_IOS::openmode base ) |
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| 57 | { |
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| 58 | using namespace std; |
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| 59 | m |= base; |
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| 60 | #ifdef BOOST_IOSTREAMS_WINDOWS //---------------------------------------------// |
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| 61 | DWORD dwDesiredAccess; |
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| 62 | DWORD dwCreationDisposition; |
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| 63 | if ( (m & (BOOST_IOS::in | BOOST_IOS::out)) |
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| 64 | == |
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| 65 | (BOOST_IOS::in | BOOST_IOS::out) ) |
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| 66 | { |
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| 67 | assert(!(m & BOOST_IOS::app)); |
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| 68 | dwDesiredAccess = GENERIC_READ | GENERIC_WRITE; |
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| 69 | dwCreationDisposition = |
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| 70 | (m & BOOST_IOS::trunc) ? |
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| 71 | OPEN_ALWAYS : |
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| 72 | OPEN_EXISTING; |
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| 73 | } else if (m & BOOST_IOS::in) { |
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| 74 | assert(!(m & (BOOST_IOS::app |BOOST_IOS::trunc))); |
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| 75 | dwDesiredAccess = GENERIC_READ; |
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| 76 | dwCreationDisposition = OPEN_EXISTING; |
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| 77 | } else if (m & BOOST_IOS::out) { |
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| 78 | dwDesiredAccess = GENERIC_WRITE; |
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| 79 | dwCreationDisposition = OPEN_ALWAYS; |
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| 80 | if (m & BOOST_IOS::app) |
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| 81 | pimpl_->flags_ |= impl::append; |
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| 82 | } |
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| 83 | |
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| 84 | HANDLE handle = |
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| 85 | ::CreateFileA( path.c_str(), |
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| 86 | dwDesiredAccess, |
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| 87 | 0, // dwShareMode |
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| 88 | NULL, // lpSecurityAttributes |
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| 89 | dwCreationDisposition, |
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| 90 | FILE_ATTRIBUTE_NORMAL, |
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| 91 | NULL ); // hTemplateFile |
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| 92 | if (handle != INVALID_HANDLE_VALUE) { |
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| 93 | pimpl_->handle_ = handle; |
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| 94 | pimpl_->flags_ |= impl::close_on_exit | impl::has_handle; |
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| 95 | } else { |
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| 96 | pimpl_->flags_ = 0; |
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| 97 | throw BOOST_IOSTREAMS_FAILURE("bad open"); |
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| 98 | } |
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| 99 | #else // #ifdef BOOST_IOSTREAMS_WINDOWS //------------------------------------// |
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| 100 | |
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| 101 | // Calculate oflag argument to open. |
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| 102 | |
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| 103 | int oflag = 0; |
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| 104 | if ( (m & (BOOST_IOS::in | BOOST_IOS::out)) |
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| 105 | == |
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| 106 | (BOOST_IOS::in | BOOST_IOS::out) ) |
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| 107 | { |
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| 108 | assert(!(m & BOOST_IOS::app)); |
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| 109 | oflag |= O_RDWR; |
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| 110 | } else if (m & BOOST_IOS::in) { |
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| 111 | assert(!(m & (BOOST_IOS::app |BOOST_IOS::trunc))); |
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| 112 | oflag |= O_RDONLY; |
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| 113 | } else if (m & BOOST_IOS::out) { |
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| 114 | oflag |= O_WRONLY; |
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| 115 | m |= BOOST_IOS::trunc; |
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| 116 | if (m & BOOST_IOS::app) |
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| 117 | oflag |= O_APPEND; |
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| 118 | } |
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| 119 | if (m & BOOST_IOS::trunc) |
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| 120 | oflag |= O_CREAT; |
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| 121 | |
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| 122 | // Calculate pmode argument to open. |
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| 123 | |
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| 124 | mode_t pmode = S_IRUSR | S_IWUSR | |
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| 125 | S_IRGRP | S_IWGRP | |
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| 126 | S_IROTH | S_IWOTH; |
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| 127 | |
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| 128 | // Open file. |
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| 129 | |
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| 130 | int fd = BOOST_RTL(open)(path.c_str(), oflag, pmode); |
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| 131 | if (fd == -1) { |
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| 132 | throw BOOST_IOSTREAMS_FAILURE("bad open"); |
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| 133 | } else { |
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| 134 | pimpl_->fd_ = fd; |
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| 135 | pimpl_->flags_ = impl::close_on_exit; |
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| 136 | } |
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| 137 | #endif // #ifndef BOOST_IOSTREAMS_WINDOWS //----------------------------------// |
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| 138 | } |
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| 139 | |
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| 140 | std::streamsize file_descriptor::read(char_type* s, std::streamsize n) |
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| 141 | { |
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| 142 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 143 | if (pimpl_->flags_ & impl::has_handle) { |
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| 144 | DWORD result; |
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| 145 | if (!::ReadFile(pimpl_->handle_, s, n, &result, NULL)) |
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| 146 | throw detail::bad_read(); |
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| 147 | return static_cast<std::streamsize>(result); |
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| 148 | } |
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| 149 | #endif |
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| 150 | errno = 0; |
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| 151 | std::streamsize result = BOOST_RTL(read)(pimpl_->fd_, s, n); |
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| 152 | if (errno != 0) |
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| 153 | throw detail::bad_read(); |
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| 154 | return result == 0 ? -1 : result; |
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| 155 | } |
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| 156 | |
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| 157 | std::streamsize file_descriptor::write(const char_type* s, std::streamsize n) |
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| 158 | { |
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| 159 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 160 | if (pimpl_->flags_ & impl::has_handle) { |
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| 161 | if (pimpl_->flags_ & impl::append) { |
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| 162 | ::SetFilePointer(pimpl_->handle_, 0, NULL, FILE_END); |
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| 163 | if (::GetLastError() != NO_ERROR) |
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| 164 | throw detail::bad_seek(); |
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| 165 | } |
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| 166 | DWORD ignore; |
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| 167 | if (!::WriteFile(pimpl_->handle_, s, n, &ignore, NULL)) |
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| 168 | throw detail::bad_write(); |
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| 169 | return n; |
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| 170 | } |
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| 171 | #endif |
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| 172 | int amt = BOOST_RTL(write)(pimpl_->fd_, s, n); |
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| 173 | if (amt < n) |
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| 174 | throw detail::bad_write(); // Handles blocking fd's only. |
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| 175 | return n; |
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| 176 | } |
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| 177 | |
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| 178 | std::streampos file_descriptor::seek |
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| 179 | (stream_offset off, BOOST_IOS::seekdir way) |
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| 180 | { |
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| 181 | using namespace std; |
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| 182 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 183 | if (pimpl_->flags_ & impl::has_handle) { |
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| 184 | LONG lDistanceToMove = static_cast<LONG>(off & 0xffffffff); |
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| 185 | LONG lDistanceToMoveHigh = static_cast<LONG>(off >> 32); |
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| 186 | DWORD dwResultLow = |
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| 187 | ::SetFilePointer( pimpl_->handle_, |
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| 188 | lDistanceToMove, |
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| 189 | &lDistanceToMoveHigh, |
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| 190 | way == BOOST_IOS::beg ? |
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| 191 | FILE_BEGIN : |
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| 192 | way == BOOST_IOS::cur ? |
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| 193 | FILE_CURRENT : |
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| 194 | FILE_END ); |
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| 195 | if (::GetLastError() != NO_ERROR) { |
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| 196 | throw detail::bad_seek(); |
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| 197 | } else { |
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| 198 | return offset_to_position((lDistanceToMoveHigh << 32) + dwResultLow); |
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| 199 | } |
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| 200 | } |
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| 201 | #endif // #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 202 | |
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| 203 | #ifndef BOOST_IOSTREAMS_HAS_LSEEK64 |
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| 204 | if ( off > integer_traits<long>::const_max || |
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| 205 | off < integer_traits<long>::const_min ) |
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| 206 | { |
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| 207 | throw BOOST_IOSTREAMS_FAILURE("bad offset"); |
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| 208 | } |
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| 209 | #endif |
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| 210 | |
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| 211 | stream_offset result = |
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| 212 | #ifdef BOOST_IOSTREAMS_HAS_LSEEK64 |
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| 213 | lseek64 |
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| 214 | #else |
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| 215 | lseek |
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| 216 | #endif |
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| 217 | ( pimpl_->fd_, |
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| 218 | #ifdef BOOST_IOSTREAMS_HAS_LSEEK64 |
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| 219 | off, |
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| 220 | #else |
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| 221 | static_cast<long>(off), |
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| 222 | #endif |
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| 223 | way == BOOST_IOS::beg ? |
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| 224 | SEEK_SET : |
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| 225 | way == BOOST_IOS::cur ? |
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| 226 | SEEK_CUR : |
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| 227 | SEEK_END ); |
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| 228 | if (result == -1) |
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| 229 | throw detail::bad_seek(); |
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| 230 | return offset_to_position(result); |
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| 231 | } |
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| 232 | |
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| 233 | void file_descriptor::close() { close_impl(*pimpl_); } |
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| 234 | |
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| 235 | void file_descriptor::close_impl(impl& i) |
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| 236 | { |
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| 237 | #ifdef BOOST_IOSTREAMS_WINDOWS |
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| 238 | if (i.flags_ & impl::has_handle) { |
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| 239 | if (!::CloseHandle(i.handle_)) |
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| 240 | throw BOOST_IOSTREAMS_FAILURE("bad close"); |
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| 241 | i.fd_ = -1; |
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| 242 | i.flags_ = 0; |
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| 243 | return; |
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| 244 | } |
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| 245 | #endif |
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| 246 | if (i.fd_ != -1) { |
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| 247 | if (BOOST_RTL(close)(i.fd_) == -1) |
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| 248 | throw BOOST_IOSTREAMS_FAILURE("bad close"); |
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| 249 | i.fd_ = -1; |
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| 250 | i.flags_ = 0; |
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| 251 | } |
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| 252 | } |
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| 253 | |
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| 254 | } } // End namespaces iostreams, boost. |
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