mirror of
https://github.com/autc04/Retro68.git
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105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"sync"
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"syscall"
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"time"
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)
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// A fileStat is the implementation of FileInfo returned by Stat and Lstat.
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type fileStat struct {
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name string
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sys syscall.Win32FileAttributeData
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// used to implement SameFile
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sync.Mutex
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path string
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vol uint32
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idxhi uint32
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idxlo uint32
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}
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func (fs *fileStat) Size() int64 {
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return int64(fs.sys.FileSizeHigh)<<32 + int64(fs.sys.FileSizeLow)
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}
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func (fs *fileStat) Mode() (m FileMode) {
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if fs == &devNullStat {
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return ModeDevice | ModeCharDevice | 0666
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}
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if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
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m |= ModeDir | 0111
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}
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if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
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m |= 0444
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} else {
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m |= 0666
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}
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return m
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}
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func (fs *fileStat) ModTime() time.Time {
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return time.Unix(0, fs.sys.LastWriteTime.Nanoseconds())
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}
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// Sys returns syscall.Win32FileAttributeData for file fs.
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func (fs *fileStat) Sys() interface{} { return &fs.sys }
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func (fs *fileStat) loadFileId() error {
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fs.Lock()
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defer fs.Unlock()
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if fs.path == "" {
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// already done
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return nil
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}
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pathp, err := syscall.UTF16PtrFromString(fs.path)
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if err != nil {
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return err
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}
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h, err := syscall.CreateFile(pathp, 0, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
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if err != nil {
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return err
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}
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defer syscall.CloseHandle(h)
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var i syscall.ByHandleFileInformation
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err = syscall.GetFileInformationByHandle(syscall.Handle(h), &i)
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if err != nil {
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return err
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}
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fs.path = ""
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fs.vol = i.VolumeSerialNumber
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fs.idxhi = i.FileIndexHigh
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fs.idxlo = i.FileIndexLow
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return nil
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}
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// devNullStat is fileStat structure describing DevNull file ("NUL").
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var devNullStat = fileStat{
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name: DevNull,
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// hopefully this will work for SameFile
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vol: 0,
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idxhi: 0,
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idxlo: 0,
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}
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func sameFile(fs1, fs2 *fileStat) bool {
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e := fs1.loadFileId()
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if e != nil {
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return false
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}
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e = fs2.loadFileId()
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if e != nil {
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return false
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}
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return fs1.vol == fs2.vol && fs1.idxhi == fs2.idxhi && fs1.idxlo == fs2.idxlo
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}
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// For testing.
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func atime(fi FileInfo) time.Time {
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return time.Unix(0, fi.Sys().(*syscall.Win32FileAttributeData).LastAccessTime.Nanoseconds())
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}
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