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package frontend
import (
"fmt"
"github.com/rfjakob/gocryptfs/cryptfs"
"github.com/rfjakob/cluefs/lib/cluefs"
"bazil.org/fuse"
fusefs "bazil.org/fuse/fs"
"golang.org/x/net/context"
)
type File struct {
*cluefs.File
crfs *cryptfs.CryptFS
}
func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fusefs.Handle, error) {
fmt.Printf("File.Open: f.crfs=%p\n", f.crfs)
h, err := f.File.Open(ctx, req, resp)
if err != nil {
return nil, err
}
clueFile := h.(*cluefs.File)
return &File {
File: clueFile,
crfs: f.crfs,
}, nil
}
func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
fmt.Printf("File.Read: f.crfs=%p\n", f.crfs)
iblocks := f.crfs.SplitRange(req.Offset, int64(req.Size))
for _, ib := range iblocks {
var partReq fuse.ReadRequest
var partResp fuse.ReadResponse
o, l := ib.CiphertextRange()
partReq.Size = int(l)
partResp.Data = make([]byte, int(l))
partReq.Offset = o
err := f.File.Read(ctx, &partReq, &partResp)
if err != nil {
return err
}
plaintext, err := f.crfs.DecryptBlock(partResp.Data)
if err != nil {
fmt.Printf("Read: Block %d: %s\n", ib.BlockNo, err.Error())
return err
}
plaintext = ib.CropBlock(partResp.Data)
resp.Data = append(resp.Data, plaintext...)
}
return nil
}
func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
iblocks := f.crfs.SplitRange(req.Offset, int64(len(req.Data)))
iblocks = iblocks
return nil
}
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