From 4ab9862ccb5911836acda9834b0b25f892229533 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sat, 5 Sep 2015 14:08:00 +0200
Subject: Fix read path

---
 frontend/dir.go  | 15 ++++++++++++---
 frontend/file.go | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 62 insertions(+), 4 deletions(-)

(limited to 'frontend')

diff --git a/frontend/dir.go b/frontend/dir.go
index eca3cf5..ce64a5a 100644
--- a/frontend/dir.go
+++ b/frontend/dir.go
@@ -45,10 +45,16 @@ func (d *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.Lo
 	}
 	clueDir, ok := n.(*cluefs.Dir)
 	if ok {
-		return &Dir { Dir: clueDir }, nil
+		return &Dir {
+			Dir: clueDir,
+			crfs: d.crfs,
+		}, nil
 	} else {
 		clueFile := n.(*cluefs.File)
-		return &File { File: clueFile }, nil
+		return &File {
+			File: clueFile,
+			crfs: d.crfs,
+		}, nil
 	}
 }
 
@@ -103,6 +109,9 @@ func (d *Dir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.Cr
 		return nil, nil, err
 	}
 	clueFile := n.(*cluefs.File)
-	cryptFile := &File {File: clueFile}
+	cryptFile := &File {
+		File: clueFile,
+		crfs: d.crfs,
+	}
 	return cryptFile, cryptFile, nil
 }
diff --git a/frontend/file.go b/frontend/file.go
index 81590e8..c5a02be 100644
--- a/frontend/file.go
+++ b/frontend/file.go
@@ -1,11 +1,60 @@
 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 {
-	*cryptfs.CryptFile
 	*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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