RESTinio

sendfile_defs_win.hpp
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1/*
2 restinio
3*/
4
11#pragma once
12
13#if defined(RESTINIO_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
14
15#include <cstdio>
16
17 namespace restinio
18{
19
23 using file_descriptor_t = HANDLE;
24 using file_offset_t = std::uint64_t;
25 using file_size_t = std::uint64_t;
27
36 inline file_descriptor_t null_file_descriptor(){ return INVALID_HANDLE_VALUE; }
37
39 inline file_descriptor_t
40 open_file( const char * file_path )
41{
42 file_descriptor_t file_descriptor =
43 // We don't support Unicode on Windows, so call Ansi-version of
44 // CreateFile directly.
45 ::CreateFileA(
46 file_path,
47 GENERIC_READ,
48 FILE_SHARE_READ,
49 0,
50 OPEN_EXISTING,
51 FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
52 0 );
53
54 if( null_file_descriptor() == file_descriptor )
55 {
56 throw exception_t{
57 fmt::format( "unable to openfile '{}': error({})", file_path, GetLastError() ) };
58 }
59
60 return file_descriptor;
61}
62
64 template < typename META >
65META
66 get_file_meta( file_descriptor_t fd )
67{
68 file_size_t fsize = 0;
69 std::chrono::system_clock::time_point flastmodified;
70
71 if( null_file_descriptor() != fd )
72 {
73 LARGE_INTEGER file_size;
74 // Obtain file size:
75 if( GetFileSizeEx( fd, &file_size ) )
76 {
77 fsize = static_cast< file_size_t >( file_size.QuadPart );
78 }
79 else
80 {
81 throw exception_t{
82 fmt::format( "unable to get file size: error code:{}", GetLastError() ) };
83 }
84
85 FILETIME ftWrite;
86 if( GetFileTime( fd, NULL, NULL, &ftWrite ) )
87 {
88 // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724284(v=vs.85).aspx
89
90 // Microseconds between 1601-01-01 00:00:00 UTC and 1970-01-01 00:00:00 UTC
91 constexpr std::uint64_t nanosec100_in_microsec = 10;
92 constexpr std::uint64_t epoch_difference_in_microsec =
93 11644473600ULL * 1000 *1000;
94
95 // First convert 100-ns intervals to microseconds, then adjust for the
96 // epoch difference
97 ULARGE_INTEGER ull;
98 ull.LowPart = ftWrite.dwLowDateTime;
99 ull.HighPart = ftWrite.dwHighDateTime;
100
101 flastmodified =
102 std::chrono::system_clock::time_point{
103 std::chrono::microseconds(
104 ull.QuadPart / nanosec100_in_microsec - epoch_difference_in_microsec ) };
105 }
106 else
107 {
108 throw exception_t{
109 fmt::format(
110 "unable to get file last modification: error code:{}",
111 GetLastError() ) };
112 }
113 }
114
115 return META{ fsize, flastmodified};
116}
117
119 inline void
120 close_file( file_descriptor_t fd )
121{
122 CloseHandle( fd );
123}
125
126} /* namespace restinio */
127
128#else // #if defined(RESTINIO_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
129
130#include <restinio/sendfile_defs_default.hpp>
131
132#endif // #if defined(RESTINIO_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
restinio
Definition: asio_include.hpp:21
restinio::null_file_descriptor
constexpr file_descriptor_t null_file_descriptor()
Get file descriptor which stands for null.
Definition: sendfile_defs_default.hpp:36
restinio::file_size_t
std::uint64_t file_size_t
Definition: sendfile_defs_default.hpp:23
restinio::close_file
void close_file(file_descriptor_t fd)
Close file by its descriptor.
Definition: sendfile_defs_default.hpp:89
restinio::file_offset_t
std::int64_t file_offset_t
Definition: sendfile_defs_default.hpp:22
restinio::file_descriptor_t
std::FILE * file_descriptor_t
Definition: sendfile_defs_default.hpp:21
restinio::open_file
file_descriptor_t open_file(const char *file_path)
Open file.
Definition: sendfile_defs_default.hpp:40
restinio::get_file_meta
META get_file_meta(file_descriptor_t fd)
Get file size.
Definition: sendfile_defs_default.hpp:55
sendfile_defs_default.hpp