MPD: fs/FileInfo.hxx Source File

MPD 0.20.18

FileInfo.hxx
Go to the documentation of this file.
1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef MPD_FS_FILE_INFO_HXX
21 #define MPD_FS_FILE_INFO_HXX
22
23 #include "check.h"
24 #include "Path.hxx"
25 #include "system/Error.hxx"
26
27 #include <stdint.h>
28
29 #ifdef _WIN32
30 #include <fileapi.h>
31 #else
32 #include <sys/stat.h>
33 #endif
34
35 #ifdef _WIN32
36
37 static inline constexpr uint64_t
38 ConstructUint64(DWORD lo, DWORD hi)
39 {
40 return uint64_t(lo) | (uint64_t(hi) << 32);
41 }
42
43 static constexpr time_t
44 FileTimeToTimeT(FILETIME ft)
45 {
46 return (ConstructUint64(ft.dwLowDateTime, ft.dwHighDateTime)
47 - 116444736000000000) / 10000000;
48 }
49
50 #endif
51
52 class FileInfo {
53 friend bool GetFileInfo(Path path, FileInfo &info,
54 bool follow_symlinks);
55 friend class FileReader;
56
57 #ifdef _WIN32
58 WIN32_FILE_ATTRIBUTE_DATA data;
59 #else
60 struct stat st;
61 #endif
62
63 public:
64 FileInfo() = default;
65
66 FileInfo(Path path, bool follow_symlinks=true) {
67 if (!GetFileInfo(path, *this, follow_symlinks)) {
68 #ifdef _WIN32
69 throw FormatLastError("Failed to access %s",
70 path.ToUTF8().c_str());
71 #else
72 throw FormatErrno("Failed to access %s",
73 path.ToUTF8().c_str());
74 #endif
75 }
76 }
77
78 bool IsRegular() const {
79 #ifdef _WIN32
80 return (data.dwFileAttributes &
81 (FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_DEVICE)) == 0;
82 #else
83 return S_ISREG(st.st_mode);
84 #endif
85 }
86
87 bool IsDirectory() const {
88 #ifdef _WIN32
89 return data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
90 #else
91 return S_ISDIR(st.st_mode);
92 #endif
93 }
94
95 uint64_t GetSize() const {
96 #ifdef _WIN32
97 return ConstructUint64(data.nFileSizeLow, data.nFileSizeHigh);
98 #else
99 return st.st_size;
100 #endif
101 }
102
103 time_t GetModificationTime() const {
104 #ifdef _WIN32
105 return FileTimeToTimeT(data.ftLastWriteTime);
106 #else
107 return st.st_mtime;
108 #endif
109 }
110
111 #ifndef _WIN32
112 uid_t GetUid() const {
113 return st.st_uid;
114 }
115
116 mode_t GetMode() const {
117 return st.st_mode;
118 }
119
120 dev_t GetDevice() const {
121 return st.st_dev;
122 }
123
124 ino_t GetInode() const {
125 return st.st_ino;
126 }
127 #endif
128 };
129
130 inline bool
131 GetFileInfo(Path path, FileInfo &info, bool follow_symlinks=true)
132 {
133 #ifdef _WIN32
134 (void)follow_symlinks;
135 return GetFileAttributesEx(path.c_str(), GetFileExInfoStandard,
136 &info.data);
137 #else
138 int ret = follow_symlinks
139 ? stat(path.c_str(), &info.st)
140 : lstat(path.c_str(), &info.st);
141 return ret == 0;
142 #endif
143 }
144
145 #endif
FileInfo::IsRegular
bool IsRegular() const
Definition: FileInfo.hxx:78
check.h
FileInfo::GetDevice
dev_t GetDevice() const
Definition: FileInfo.hxx:120
FileInfo::GetUid
uid_t GetUid() const
Definition: FileInfo.hxx:112
Path::c_str
gcc_pure const_pointer_type c_str() const noexcept
Returns the value as a const C string.
Definition: Path.hxx:107
FileInfo::IsDirectory
bool IsDirectory() const
Definition: FileInfo.hxx:87
FileInfo::GetFileInfo
friend bool GetFileInfo(Path path, FileInfo &info, bool follow_symlinks)
Definition: FileInfo.hxx:131
FormatErrno
static std::system_error FormatErrno(int code, const char *fmt, Args &&... args)
Definition: Error.hxx:135
Path
A path name in the native file system character set.
Definition: Path.hxx:39
FileInfo::GetModificationTime
time_t GetModificationTime() const
Definition: FileInfo.hxx:103
GetFileInfo
bool GetFileInfo(Path path, FileInfo &info, bool follow_symlinks=true)
Definition: FileInfo.hxx:131
Path.hxx
Error.hxx
FileReader
Definition: FileReader.hxx:39
FileInfo::GetSize
uint64_t GetSize() const
Definition: FileInfo.hxx:95
FileInfo::GetInode
ino_t GetInode() const
Definition: FileInfo.hxx:124
Path::ToUTF8
gcc_pure std::string ToUTF8() const noexcept
Convert the path to UTF-8.
FileInfo::FileInfo
FileInfo()=default
FileInfo::FileInfo
FileInfo(Path path, bool follow_symlinks=true)
Definition: FileInfo.hxx:66
FileInfo::GetMode
mode_t GetMode() const
Definition: FileInfo.hxx:116
FileInfo
Definition: FileInfo.hxx:52