113 строки
3,4 КиБ
Go
113 строки
3,4 КиБ
Go
// +build go1.16
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package os
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import (
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"io"
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"io/fs"
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)
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type (
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DirEntry = fs.DirEntry
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FileMode = fs.FileMode
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FileInfo = fs.FileInfo
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)
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func (f *File) ReadDir(n int) ([]DirEntry, error) {
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return nil, &PathError{"ReadDir", f.name, ErrNotImplemented}
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}
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func ReadDir(name string) ([]DirEntry, error) {
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return nil, &PathError{"ReadDir", name, ErrNotImplemented}
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}
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// The followings are copied from Go 1.16 official implementation:
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// https://github.com/golang/go/blob/go1.16/src/os/file.go
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// ReadFile reads the named file and returns the contents.
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// A successful call returns err == nil, not err == EOF.
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// Because ReadFile reads the whole file, it does not treat an EOF from Read
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// as an error to be reported.
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func ReadFile(name string) ([]byte, error) {
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f, err := Open(name)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var size int
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if info, err := f.Stat(); err == nil {
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size64 := info.Size()
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if int64(int(size64)) == size64 {
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size = int(size64)
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}
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}
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size++ // one byte for final read at EOF
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// If a file claims a small size, read at least 512 bytes.
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// In particular, files in Linux's /proc claim size 0 but
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// then do not work right if read in small pieces,
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// so an initial read of 1 byte would not work correctly.
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if size < 512 {
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size = 512
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}
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data := make([]byte, 0, size)
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for {
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if len(data) >= cap(data) {
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d := append(data[:cap(data)], 0)
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data = d[:len(data)]
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}
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n, err := f.Read(data[len(data):cap(data)])
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data = data[:len(data)+n]
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if err != nil {
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if err == io.EOF {
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err = nil
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}
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return data, err
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}
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}
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}
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// WriteFile writes data to the named file, creating it if necessary.
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// If the file does not exist, WriteFile creates it with permissions perm (before umask);
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// otherwise WriteFile truncates it before writing, without changing permissions.
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func WriteFile(name string, data []byte, perm FileMode) error {
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f, err := OpenFile(name, O_WRONLY|O_CREATE|O_TRUNC, perm)
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if err != nil {
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return err
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}
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_, err = f.Write(data)
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if err1 := f.Close(); err1 != nil && err == nil {
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err = err1
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}
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return err
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}
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// The defined file mode bits are the most significant bits of the FileMode.
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// The nine least-significant bits are the standard Unix rwxrwxrwx permissions.
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// The values of these bits should be considered part of the public API and
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// may be used in wire protocols or disk representations: they must not be
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// changed, although new bits might be added.
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const (
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// The single letters are the abbreviations
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// used by the String method's formatting.
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ModeDir = fs.ModeDir // d: is a directory
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ModeAppend = fs.ModeAppend // a: append-only
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ModeExclusive = fs.ModeExclusive // l: exclusive use
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ModeTemporary = fs.ModeTemporary // T: temporary file; Plan 9 only
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ModeSymlink = fs.ModeSymlink // L: symbolic link
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ModeDevice = fs.ModeDevice // D: device file
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ModeNamedPipe = fs.ModeNamedPipe // p: named pipe (FIFO)
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ModeSocket = fs.ModeSocket // S: Unix domain socket
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ModeSetuid = fs.ModeSetuid // u: setuid
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ModeSetgid = fs.ModeSetgid // g: setgid
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ModeCharDevice = fs.ModeCharDevice // c: Unix character device, when ModeDevice is set
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ModeSticky = fs.ModeSticky // t: sticky
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ModeIrregular = fs.ModeIrregular // ?: non-regular file; nothing else is known about this file
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// Mask for the type bits. For regular files, none will be set.
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ModeType = fs.ModeType
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ModePerm = fs.ModePerm // Unix permission bits, 0o777
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)
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