github.com/freddyisaac/sicortex-golang@v0.0.0-20231019035217-e03519e66f60/src/os/types_windows.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package os
     6  
     7  import (
     8  	"sync"
     9  	"syscall"
    10  	"time"
    11  )
    12  
    13  // A fileStat is the implementation of FileInfo returned by Stat and Lstat.
    14  type fileStat struct {
    15  	name string
    16  	sys  syscall.Win32FileAttributeData
    17  	pipe bool
    18  
    19  	// used to implement SameFile
    20  	sync.Mutex
    21  	path  string
    22  	vol   uint32
    23  	idxhi uint32
    24  	idxlo uint32
    25  }
    26  
    27  func (fs *fileStat) Size() int64 {
    28  	return int64(fs.sys.FileSizeHigh)<<32 + int64(fs.sys.FileSizeLow)
    29  }
    30  
    31  func (fs *fileStat) Mode() (m FileMode) {
    32  	if fs == &devNullStat {
    33  		return ModeDevice | ModeCharDevice | 0666
    34  	}
    35  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
    36  		m |= ModeDir | 0111
    37  	}
    38  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_READONLY != 0 {
    39  		m |= 0444
    40  	} else {
    41  		m |= 0666
    42  	}
    43  	if fs.sys.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT != 0 {
    44  		m |= ModeSymlink
    45  	}
    46  	if fs.pipe {
    47  		m |= ModeNamedPipe
    48  	}
    49  	return m
    50  }
    51  
    52  func (fs *fileStat) ModTime() time.Time {
    53  	return time.Unix(0, fs.sys.LastWriteTime.Nanoseconds())
    54  }
    55  
    56  // Sys returns syscall.Win32FileAttributeData for file fs.
    57  func (fs *fileStat) Sys() interface{} { return &fs.sys }
    58  
    59  func (fs *fileStat) loadFileId() error {
    60  	fs.Lock()
    61  	defer fs.Unlock()
    62  	if fs.path == "" {
    63  		// already done
    64  		return nil
    65  	}
    66  	pathp, err := syscall.UTF16PtrFromString(fs.path)
    67  	if err != nil {
    68  		return err
    69  	}
    70  	h, err := syscall.CreateFile(pathp, 0, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
    71  	if err != nil {
    72  		return err
    73  	}
    74  	defer syscall.CloseHandle(h)
    75  	var i syscall.ByHandleFileInformation
    76  	err = syscall.GetFileInformationByHandle(h, &i)
    77  	if err != nil {
    78  		return err
    79  	}
    80  	fs.path = ""
    81  	fs.vol = i.VolumeSerialNumber
    82  	fs.idxhi = i.FileIndexHigh
    83  	fs.idxlo = i.FileIndexLow
    84  	return nil
    85  }
    86  
    87  // devNullStat is fileStat structure describing DevNull file ("NUL").
    88  var devNullStat = fileStat{
    89  	name: DevNull,
    90  	// hopefully this will work for SameFile
    91  	vol:   0,
    92  	idxhi: 0,
    93  	idxlo: 0,
    94  }
    95  
    96  func sameFile(fs1, fs2 *fileStat) bool {
    97  	e := fs1.loadFileId()
    98  	if e != nil {
    99  		return false
   100  	}
   101  	e = fs2.loadFileId()
   102  	if e != nil {
   103  		return false
   104  	}
   105  	return fs1.vol == fs2.vol && fs1.idxhi == fs2.idxhi && fs1.idxlo == fs2.idxlo
   106  }
   107  
   108  // For testing.
   109  func atime(fi FileInfo) time.Time {
   110  	return time.Unix(0, fi.Sys().(*syscall.Win32FileAttributeData).LastAccessTime.Nanoseconds())
   111  }