2010-04-02 02:11:17 -06:00
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// 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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2011-09-05 17:59:08 -06:00
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import (
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"syscall"
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2011-11-30 10:01:46 -07:00
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"time"
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2011-11-02 13:54:16 -06:00
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"unsafe"
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2011-09-05 17:59:08 -06:00
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)
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2010-04-02 02:11:17 -06:00
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2011-09-05 17:59:08 -06:00
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// Stat returns the FileInfo structure describing file.
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// It returns the FileInfo and an error, if any.
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2011-11-30 10:04:16 -07:00
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func (file *File) Stat() (fi FileInfo, err error) {
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if file == nil || file.fd < 0 {
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return nil, EINVAL
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}
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if file.isdir() {
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// I don't know any better way to do that for directory
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return Stat(file.name)
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}
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var d syscall.ByHandleFileInformation
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e := syscall.GetFileInformationByHandle(syscall.Handle(file.fd), &d)
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if e != nil {
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return nil, &PathError{"GetFileInformationByHandle", file.name, e}
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2011-09-05 17:59:08 -06:00
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}
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return toFileInfo(basename(file.name), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime), nil
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2010-04-27 00:17:14 -06:00
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}
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2011-09-05 17:59:08 -06:00
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// Stat returns a FileInfo structure describing the named file and an error, if any.
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// If name names a valid symbolic link, the returned FileInfo describes
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// the file pointed at by the link and has fi.FollowedSymlink set to true.
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// If name names an invalid symbolic link, the returned FileInfo describes
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// the link itself and has fi.FollowedSymlink set to false.
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func Stat(name string) (fi FileInfo, err error) {
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if len(name) == 0 {
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return nil, &PathError{"Stat", name, syscall.Errno(syscall.ERROR_PATH_NOT_FOUND)}
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}
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var d syscall.Win32FileAttributeData
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e := syscall.GetFileAttributesEx(syscall.StringToUTF16Ptr(name), syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&d)))
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if e != nil {
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return nil, &PathError{"GetFileAttributesEx", name, e}
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}
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return toFileInfo(basename(name), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime), nil
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}
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2011-09-05 17:59:08 -06:00
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// Lstat returns the FileInfo structure describing the named file and an
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// error, if any. If the file is a symbolic link, the returned FileInfo
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// describes the symbolic link. Lstat makes no attempt to follow the link.
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func Lstat(name string) (fi FileInfo, err error) {
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// No links on Windows
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return Stat(name)
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}
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// basename removes trailing slashes and the leading
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// directory name and drive letter from path name.
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func basename(name string) string {
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// Remove drive letter
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if len(name) == 2 && name[1] == ':' {
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name = "."
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} else if len(name) > 2 && name[1] == ':' {
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name = name[2:]
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}
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i := len(name) - 1
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// Remove trailing slashes
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for ; i > 0 && (name[i] == '/' || name[i] == '\\'); i-- {
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name = name[:i]
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}
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// Remove leading directory name
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for i--; i >= 0; i-- {
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if name[i] == '/' || name[i] == '\\' {
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name = name[i+1:]
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break
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}
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}
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return name
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}
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2011-11-30 10:38:54 -07:00
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type winTimes struct {
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atime, ctime syscall.Filetime
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}
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func toFileInfo(name string, fa, sizehi, sizelo uint32, ctime, atime, mtime syscall.Filetime) FileInfo {
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fs := new(FileStat)
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fs.mode = 0
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if fa&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
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fs.mode |= ModeDir
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}
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if fa&syscall.FILE_ATTRIBUTE_READONLY != 0 {
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fs.mode |= 0444
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} else {
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fs.mode |= 0666
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}
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fs.size = int64(sizehi)<<32 + int64(sizelo)
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fs.name = name
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fs.modTime = time.Unix(0, mtime.Nanoseconds())
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fs.Sys = &winTimes{atime, ctime}
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return fs
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}
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func sameFile(fs1, fs2 *FileStat) bool {
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return false
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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.(*FileStat).Sys.(*winTimes).atime.Nanoseconds())
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}
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