libgocryptfs/internal/fusefrontend_reverse/virtualfile.go
Jakob Unterwurzacher a6a7b424f8 reverse: resolve long names in Open and GetAttr
The last patch added functionality for generating gocryptfs.longname.*
files, this patch adds support for mapping them back to the full
filenames.

Note that resolving a long name needs a full readdir. A cache
will be implemented later on to improve performance.
2016-09-25 16:43:17 +02:00

58 lines
1.3 KiB
Go

package fusefrontend_reverse
import (
"fmt"
"syscall"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
)
type virtualFile struct {
// Embed nodefs.defaultFile for a ENOSYS implementation of all methods
nodefs.File
// file content
content []byte
// absolute path to a parent file
parentFile string
// inode number
ino uint64
}
func (rfs *reverseFS) NewVirtualFile(content []byte, parentFile string) (nodefs.File, fuse.Status) {
return &virtualFile{
File: nodefs.NewDefaultFile(),
content: content,
parentFile: parentFile,
ino: rfs.inoGen.next(),
}, fuse.OK
}
// Read - FUSE call
func (f *virtualFile) Read(buf []byte, off int64) (resultData fuse.ReadResult, status fuse.Status) {
if off >= int64(len(f.content)) {
return nil, fuse.OK
}
end := int(off) + len(buf)
if end > len(f.content) {
end = len(f.content)
}
return fuse.ReadResultData(f.content[off:end]), fuse.OK
}
// GetAttr - FUSE call
func (f *virtualFile) GetAttr(a *fuse.Attr) fuse.Status {
var st syscall.Stat_t
err := syscall.Lstat(f.parentFile, &st)
if err != nil {
fmt.Printf("Lstat %q: %v\n", f.parentFile, err)
return fuse.ToStatus(err)
}
st.Ino = f.ino
st.Size = int64(len(f.content))
st.Mode = syscall.S_IFREG | 0400
st.Nlink = 1
a.FromStat(&st)
return fuse.OK
}