mirror of
https://github.com/rclone/rclone.git
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94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
// Copyright 2019 the Go-FUSE 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 fs
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import (
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"sync"
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"syscall"
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"unsafe"
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"github.com/hanwen/go-fuse/v2/fuse"
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)
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type loopbackDirStream struct {
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buf []byte
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todo []byte
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// Protects fd so we can guard against double close
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mu sync.Mutex
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fd int
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}
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// NewLoopbackDirStream open a directory for reading as a DirStream
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func NewLoopbackDirStream(name string) (DirStream, syscall.Errno) {
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fd, err := syscall.Open(name, syscall.O_DIRECTORY, 0755)
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if err != nil {
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return nil, ToErrno(err)
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}
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ds := &loopbackDirStream{
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buf: make([]byte, 4096),
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fd: fd,
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}
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if err := ds.load(); err != 0 {
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ds.Close()
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return nil, err
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}
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return ds, OK
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}
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func (ds *loopbackDirStream) Close() {
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ds.mu.Lock()
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defer ds.mu.Unlock()
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if ds.fd != -1 {
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syscall.Close(ds.fd)
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ds.fd = -1
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}
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}
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func (ds *loopbackDirStream) HasNext() bool {
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ds.mu.Lock()
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defer ds.mu.Unlock()
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return len(ds.todo) > 0
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}
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func (ds *loopbackDirStream) Next() (fuse.DirEntry, syscall.Errno) {
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ds.mu.Lock()
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defer ds.mu.Unlock()
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de := (*syscall.Dirent)(unsafe.Pointer(&ds.todo[0]))
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nameBytes := ds.todo[unsafe.Offsetof(syscall.Dirent{}.Name):de.Reclen]
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ds.todo = ds.todo[de.Reclen:]
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// After the loop, l contains the index of the first '\0'.
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l := 0
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for l = range nameBytes {
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if nameBytes[l] == 0 {
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break
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}
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}
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nameBytes = nameBytes[:l]
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result := fuse.DirEntry{
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Ino: de.Ino,
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Mode: (uint32(de.Type) << 12),
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Name: string(nameBytes),
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}
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return result, ds.load()
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}
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func (ds *loopbackDirStream) load() syscall.Errno {
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if len(ds.todo) > 0 {
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return OK
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}
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n, err := syscall.Getdents(ds.fd, ds.buf)
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if err != nil {
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return ToErrno(err)
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}
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ds.todo = ds.buf[:n]
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return OK
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}
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