155 lines
3.3 KiB
C++
155 lines
3.3 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_FS_FILE_INFO_HXX
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#define MPD_FS_FILE_INFO_HXX
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#include "check.h"
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#include "Path.hxx"
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#include "system/Error.hxx"
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#ifdef WIN32
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#include <fileapi.h>
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#else
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#include <sys/stat.h>
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#endif
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#include <chrono>
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#include <stdint.h>
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#ifdef WIN32
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static inline constexpr uint64_t
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ConstructUint64(DWORD lo, DWORD hi)
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{
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return uint64_t(lo) | (uint64_t(hi) << 32);
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}
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static constexpr time_t
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FileTimeToTimeT(FILETIME ft)
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{
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return (ConstructUint64(ft.dwLowDateTime, ft.dwHighDateTime)
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- 116444736000000000) / 10000000;
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}
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static std::chrono::system_clock::time_point
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FileTimeToChrono(FILETIME ft)
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{
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// TODO: eliminate the time_t roundtrip, preserve sub-second resolution
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return std::chrono::system_clock::from_time_t(FileTimeToTimeT(ft));
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}
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#endif
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class FileInfo {
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friend bool GetFileInfo(Path path, FileInfo &info,
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bool follow_symlinks);
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friend class FileReader;
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#ifdef WIN32
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WIN32_FILE_ATTRIBUTE_DATA data;
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#else
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struct stat st;
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#endif
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public:
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FileInfo() = default;
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FileInfo(Path path, bool follow_symlinks=true) {
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if (!GetFileInfo(path, *this, follow_symlinks)) {
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#ifdef WIN32
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throw FormatLastError("Failed to access %s",
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path.ToUTF8().c_str());
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#else
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throw FormatErrno("Failed to access %s",
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path.ToUTF8().c_str());
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#endif
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}
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}
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bool IsRegular() const {
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#ifdef WIN32
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return (data.dwFileAttributes &
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(FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_DEVICE)) == 0;
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#else
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return S_ISREG(st.st_mode);
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#endif
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}
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bool IsDirectory() const {
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#ifdef WIN32
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return data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
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#else
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return S_ISDIR(st.st_mode);
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#endif
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}
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uint64_t GetSize() const {
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#ifdef WIN32
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return ConstructUint64(data.nFileSizeLow, data.nFileSizeHigh);
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#else
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return st.st_size;
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#endif
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}
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std::chrono::system_clock::time_point GetModificationTime() const {
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#ifdef WIN32
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return FileTimeToChrono(data.ftLastWriteTime);
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#else
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return std::chrono::system_clock::from_time_t(st.st_mtime);
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#endif
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}
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#ifndef WIN32
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uid_t GetUid() const {
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return st.st_uid;
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}
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mode_t GetMode() const {
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return st.st_mode;
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}
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dev_t GetDevice() const {
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return st.st_dev;
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}
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ino_t GetInode() const {
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return st.st_ino;
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}
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#endif
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};
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inline bool
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GetFileInfo(Path path, FileInfo &info, bool follow_symlinks=true)
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{
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#ifdef WIN32
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(void)follow_symlinks;
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return GetFileAttributesEx(path.c_str(), GetFileExInfoStandard,
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&info.data);
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#else
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int ret = follow_symlinks
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? stat(path.c_str(), &info.st)
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: lstat(path.c_str(), &info.st);
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return ret == 0;
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#endif
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}
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#endif
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