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mountfs_file.go
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mountfs_file.go
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package dkango
import (
"io"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"github.com/binzume/dkango/dokan"
)
type openedFile struct {
mi *disk
name string
openFlag int
cachedStat fs.FileInfo
file io.Closer
pos int64
}
func (f *openedFile) FindFiles(fillFindDataCallBack func(fi *dokan.WIN32_FIND_DATAW) (bool, error), finfo *dokan.FileInfo) dokan.NTStatus {
proc := func(files []fs.DirEntry) bool {
for _, file := range files {
fi := dokan.WIN32_FIND_DATAW{}
name, err := dokan.UTF16FromString(file.Name())
if err != nil {
log.Println("ERROR: FindFiles", err)
continue
}
copy(fi.FileName[:], name)
if file.IsDir() {
fi.FileAttributes = dokan.FILE_ATTRIBUTE_DIRECTORY
} else {
fi.FileAttributes = dokan.FILE_ATTRIBUTE_NORMAL
}
info, err := file.Info()
if err == nil {
fi.FileSizeLow = uint32(info.Size())
fi.FileSizeHigh = uint32(info.Size() >> 32)
fi.LastWriteTime = dokan.UnixNanoToFileTime(info.ModTime().UnixNano())
fi.LastAccessTime = fi.LastWriteTime
fi.CreationTime = fi.LastWriteTime
}
bufferFull, err := fillFindDataCallBack(&fi)
if err != nil || bufferFull {
return false
}
}
return true
}
if fsys, ok := f.mi.fsys.(OpenDirFS); ok {
r, err := fsys.OpenDir(f.name)
if err != nil {
return dokan.ErrorToNTStatus(err)
}
for {
if files, err := r.ReadDir(256); len(files) == 0 || !proc(files) || err != nil {
break
}
}
} else {
files, err := fs.ReadDir(f.mi.fsys, f.name)
proc(files)
return dokan.ErrorToNTStatus(err)
}
return dokan.STATUS_SUCCESS
}
func (f *openedFile) GetFileInformation(fi *dokan.ByHandleFileInfo, finfo *dokan.FileInfo) dokan.NTStatus {
if f.cachedStat == nil {
stat, err := fs.Stat(f.mi.fsys, f.name)
f.cachedStat = stat
if err != nil {
return dokan.ErrorToNTStatus(err)
}
}
if f.cachedStat.IsDir() {
fi.FileAttributes = dokan.FILE_ATTRIBUTE_DIRECTORY
}
if f.cachedStat.Mode()&0o200 == 0 {
fi.FileAttributes = dokan.FILE_ATTRIBUTE_READONLY
}
if fi.FileAttributes == 0 {
fi.FileAttributes = dokan.FILE_ATTRIBUTE_NORMAL
}
fi.FileSizeLow = uint32(f.cachedStat.Size())
fi.FileSizeHigh = uint32(f.cachedStat.Size() >> 32)
fi.LastWriteTime = dokan.UnixNanoToFileTime(f.cachedStat.ModTime().UnixNano())
fi.LastAccessTime = fi.LastWriteTime
fi.CreationTime = fi.LastWriteTime
fi.VolumeSerialNumber = int32(f.mi.opt.VolumeInfo.SerialNumber)
return dokan.STATUS_SUCCESS
}
func (f *openedFile) ReadFile(buf []byte, read *int32, offset int64, finfo *dokan.FileInfo) dokan.NTStatus {
if f.file == nil {
r, err := f.mi.fsys.Open(f.name)
if err != nil {
return dokan.ErrorToNTStatus(err)
}
f.file = r
}
if f.pos != offset {
if seeker, ok := f.file.(io.Seeker); ok {
_, err := seeker.Seek(offset, io.SeekStart)
if err != nil {
return dokan.ErrorToNTStatus(err)
}
} else if r, ok := f.file.(io.ReaderAt); ok {
n, err := r.ReadAt(buf, offset)
f.pos = -1
*read = int32(n)
if n > 0 {
return dokan.STATUS_SUCCESS // ignore EOF error
}
return dokan.ErrorToNTStatus(err)
} else {
return dokan.STATUS_NOT_SUPPORTED
}
}
if r, ok := f.file.(io.Reader); ok {
n, err := io.ReadFull(r, buf)
// n, err := r.Read(buf)
f.pos = offset + int64(n)
*read = int32(n)
if n > 0 {
return dokan.STATUS_SUCCESS // ignore EOF error
}
return dokan.ErrorToNTStatus(err)
}
return dokan.STATUS_NOT_SUPPORTED
}
func (f *openedFile) WriteFile(buf []byte, written *int32, offset int64, finfo *dokan.FileInfo) dokan.NTStatus {
if f.openFlag == os.O_RDONLY || f.file == nil {
return dokan.STATUS_ACCESS_DENIED
}
// TODO: handle negative offset correctly.
if offset >= 0 && f.pos != offset {
if seeker, ok := f.file.(io.Seeker); ok {
_, err := seeker.Seek(offset, io.SeekStart)
if err != nil {
return dokan.ErrorToNTStatus(err)
}
} else if w, ok := f.file.(io.WriterAt); ok {
f.cachedStat = nil // invalidate cached stat
f.pos = -1 // TODO
n, err := w.WriteAt(buf, offset)
*written = int32(n)
return dokan.ErrorToNTStatus(err)
} else {
return dokan.STATUS_NOT_SUPPORTED
}
}
if r, ok := f.file.(io.Writer); ok {
n, err := r.Write(buf)
f.pos = offset + int64(n)
*written = int32(n)
return dokan.ErrorToNTStatus(err)
}
return dokan.STATUS_NOT_SUPPORTED
}
func (f *openedFile) SetEndOfFile(offset int64, finfo *dokan.FileInfo) dokan.NTStatus {
if trunc, ok := f.file.(interface{ Truncate(int64) error }); ok {
f.cachedStat = nil
return dokan.ErrorToNTStatus(trunc.Truncate(offset))
} else if fsys, ok := f.mi.fsys.(TruncateFS); ok {
f.cachedStat = nil
return dokan.ErrorToNTStatus(fsys.Truncate(f.name, offset))
}
return dokan.STATUS_NOT_SUPPORTED
}
func (f *openedFile) MoveFile(newname string, replaceIfExisting bool, finfo *dokan.FileInfo) dokan.NTStatus {
fsys, ok := f.mi.fsys.(RenameFS)
if !ok {
log.Println("WARN: MoveFile: not support Rename()")
return dokan.STATUS_NOT_SUPPORTED
}
newname = strings.TrimPrefix(filepath.ToSlash(newname), "/")
if newname == "" {
newname = "."
}
f.cachedStat = nil
return dokan.ErrorToNTStatus(fsys.Rename(f.name, newname))
}
func (f *openedFile) DeleteFile(finfo *dokan.FileInfo) dokan.NTStatus {
// will be deleted in Cleanup()
return dokan.STATUS_SUCCESS
}
func (f *openedFile) DeleteDirectory(finfo *dokan.FileInfo) dokan.NTStatus {
// will be deleted in Cleanup()
return dokan.STATUS_SUCCESS
}
func (f *openedFile) Cleanup(finfo *dokan.FileInfo) dokan.NTStatus {
if !finfo.IsDeleteOnClose() {
return dokan.STATUS_SUCCESS
}
if fsys, ok := f.mi.fsys.(RemoveFS); ok {
return dokan.ErrorToNTStatus(fsys.Remove(f.name))
}
return dokan.STATUS_NOT_SUPPORTED
}
func (f *openedFile) CloseFile(*dokan.FileInfo) {
f.cachedStat = nil
if f.file != nil {
f.file.Close()
}
}