Fix size reporting

6 files changed, 86 insertions, 50 deletions

diff --git a/cryptfs/cryptfile.go b/cryptfs/cryptfile.go
index 98b6d12..e5e9462 100644
--- a/cryptfs/cryptfile.go
+++ b/cryptfs/cryptfile.go
@@ -1,9 +1,9 @@
 package cryptfs
 
 import (
-	"fmt"
+	//"fmt"
 	"os"
-	"io"
+	//"io"
 	"errors"
 	"crypto/cipher"
 )
@@ -11,8 +11,6 @@ import (
 type CryptFile struct {
 	file *os.File
 	gcm cipher.AEAD
-	plainBS	int64
-	cipherBS int64
 }
 
 // decryptBlock - Verify and decrypt GCM block
@@ -59,6 +57,7 @@ func (be *CryptFS) EncryptBlock(plaintext []byte) []byte {
 	return ciphertext
 }
 
+/*
 // readCipherBlock - Read ciphertext block number "blockNo", decrypt,
 // return plaintext
 func (be *CryptFile) readCipherBlock(blockNo int64) ([]byte, error) {
@@ -98,12 +97,13 @@ func (be *CryptFile) readCipherBlock(blockNo int64) ([]byte, error) {
 
 	return plainBuf, nil
 }
+*/
 
 // intraBlock identifies a part of a file block
 type intraBlock struct {
-	BlockNo int64  // Block number in file
-	Offset  int64  // Offset into block plaintext
-	Length  int64  // Length of data from this block
+	BlockNo uint64  // Block number in file
+	Offset  uint64  // Offset into block plaintext
+	Length  uint64  // Length of data from this block
 	fs    *CryptFS
 }
 
@@ -117,13 +117,13 @@ func (ib *intraBlock) IsPartial() bool {
 
 // CiphertextRange - get byte range in ciphertext file corresponding to BlockNo
 // (complete block)
-func (ib *intraBlock) CiphertextRange() (offset int64, length int64) {
+func (ib *intraBlock) CiphertextRange() (offset uint64, length uint64) {
 	return ib.BlockNo * ib.fs.cipherBS, ib.fs.cipherBS
 }
 
 // PlaintextRange - get byte range in plaintext corresponding to BlockNo
 // (complete block)
-func (ib *intraBlock) PlaintextRange() (offset int64, length int64) {
+func (ib *intraBlock) PlaintextRange() (offset uint64, length uint64) {
 	return ib.BlockNo * ib.fs.plainBS, ib.fs.plainBS
 }
 
@@ -138,7 +138,7 @@ func (ib *intraBlock) CropBlock(d []byte) []byte{
 }
 
 // Split a plaintext byte range into (possible partial) blocks
-func (be *CryptFS) SplitRange(offset int64, length int64) []intraBlock {
+func (be *CryptFS) SplitRange(offset uint64, length uint64) []intraBlock {
 	var b intraBlock
 	var parts []intraBlock
 
@@ -147,7 +147,7 @@ func (be *CryptFS) SplitRange(offset int64, length int64) []intraBlock {
 	for length > 0 {
 		b.BlockNo = offset / be.plainBS
 		b.Offset = offset % be.plainBS
-		b.Length = be.min64(length, be.plainBS - b.Offset)
+		b.Length = be.minu64(length, be.plainBS - b.Offset)
 		parts = append(parts, b)
 		offset += b.Length
 		length -= b.Length
@@ -155,13 +155,14 @@ func (be *CryptFS) SplitRange(offset int64, length int64) []intraBlock {
 	return parts
 }
 
-func (be *CryptFS) min64(x int64, y int64) int64 {
+func (be *CryptFS) minu64(x uint64, y uint64) uint64 {
 	if x < y {
 		return x
 	}
 	return y
 }
 
+/*
 // writeCipherBlock - Encrypt plaintext and write it to file block "blockNo"
 func (be *CryptFile) writeCipherBlock(blockNo int64, plain []byte) error {
 
@@ -186,7 +187,7 @@ func (be *CryptFile) writeCipherBlock(blockNo int64, plain []byte) error {
 // Perform RMW cycle on block
 // Write "data" into file location specified in "b"
 func (be *CryptFile) rmwWrite(b intraBlock, data []byte, f *os.File) error {
-	if b.Length != int64(len(data)) {
+	if b.Length != uint64(len(data)) {
 		panic("Length mismatch")
 	}
 
@@ -200,7 +201,7 @@ func (be *CryptFile) rmwWrite(b intraBlock, data []byte, f *os.File) error {
 
 	// Write goes beyond the old block and grows the file?
 	// Must create a bigger newBlock
-	if newBlockLen > int64(len(oldBlock)) {
+	if newBlockLen > uint64(len(oldBlock)) {
 		newBlock = make([]byte, newBlockLen)
 	} else {
 		newBlock = make([]byte, len(oldBlock))
@@ -222,3 +223,4 @@ func (be *CryptFile) rmwWrite(b intraBlock, data []byte, f *os.File) error {
 
 	return err
 }
+*/
diff --git a/cryptfs/cryptfs.go b/cryptfs/cryptfs.go
index 72eea61..d385a77 100644
--- a/cryptfs/cryptfs.go
+++ b/cryptfs/cryptfs.go
@@ -7,7 +7,6 @@ import (
 	"strings"
 	"encoding/base64"
 	"errors"
-	"os"
 )
 
 const (
@@ -22,8 +21,8 @@ const (
 type CryptFS struct {
 	blockCipher cipher.Block
 	gcm cipher.AEAD
-	plainBS	int64
-	cipherBS int64
+	plainBS	uint64
+	cipherBS uint64
 }
 
 func NewCryptFS(key [16]byte) *CryptFS {
@@ -46,6 +45,7 @@ func NewCryptFS(key [16]byte) *CryptFS {
 	}
 }
 
+/*
 func (fs *CryptFS) NewFile(f *os.File) *CryptFile {
 	return &CryptFile {
 		file: f,
@@ -54,8 +54,9 @@ func (fs *CryptFS) NewFile(f *os.File) *CryptFile {
 		cipherBS: fs.cipherBS,
 	}
 }
+*/
 
-func (be *CryptFS) PlainBS() int64 {
+func (be *CryptFS) PlainBS() uint64 {
 	return be.plainBS
 }
 
@@ -139,18 +140,25 @@ func (be *CryptFS) DecryptPath(path string) (string, error) {
 	return be.translatePath(path, DECRYPT)
 }
 
-// plainSize - calculate plaintext size from ciphertext size
-func (be *CryptFS) PlainSize(s int64) int64 {
+// PlainSize - calculate plaintext size from ciphertext size
+func (be *CryptFS) PlainSize(size uint64) uint64 {
 	// Zero sized files stay zero-sized
-	if s > 0 {
-		// Number of blocks
-		n := s / be.cipherBS + 1
+	if size > 0 {
 		overhead := be.cipherBS - be.plainBS
-		s -= n * overhead
+		nBlocks := (size + be.cipherBS - 1) / be.cipherBS
+		size -= nBlocks * overhead
 	}
-	return s
+	return size
 }
 
+
+// plainSizeFromCipherSize - calculate plaintext size from ciphertext size
+func (be *CryptFS) plainSizeFromCipherSize(size int64) int64 {
+	if size > 0 {
+
+	}
+	return size
+}
 // pad16 - pad filename to 16 byte blocks using standard PKCS#7 padding
 // https://tools.ietf.org/html/rfc5652#section-6.3
 func (be *CryptFS) pad16(orig []byte) (padded []byte) {
diff --git a/frontend/checks.go b/frontend/checks.go
new file mode 100644
index 0000000..30720f6
--- /dev/null
+++ b/frontend/checks.go
@@ -0,0 +1,31 @@
+package frontend
+
+import (
+	"bazil.org/fuse/fs"
+)
+
+// Compile-time interface checks.
+var _ fs.FS = (*FS)(nil)
+var _ fs.FSStatfser = (*FS)(nil)
+
+var _ fs.Node = (*Dir)(nil)
+var _ fs.NodeCreater = (*Dir)(nil)
+var _ fs.NodeMkdirer = (*Dir)(nil)
+var _ fs.NodeRemover = (*Dir)(nil)
+var _ fs.NodeRenamer = (*Dir)(nil)
+var _ fs.HandleReadDirAller = (*Dir)(nil)
+
+var _ fs.HandleReader = (*File)(nil)
+var _ fs.HandleWriter = (*File)(nil)
+var _ fs.Node = (*File)(nil)
+var _ fs.NodeOpener = (*File)(nil)
+var _ fs.NodeSetattrer = (*File)(nil)
+
+func foo(h fs.HandleReadDirAller) {
+
+}
+
+func init() {
+	var d Dir
+	foo(&d)
+}
diff --git a/frontend/dir.go b/frontend/dir.go
index 46be0db..ee5c474 100644
--- a/frontend/dir.go
+++ b/frontend/dir.go
@@ -11,6 +11,7 @@ import (
 
 type Dir struct {
 	*cluefs.Dir
+
 	crfs *cryptfs.CryptFS
 }
 
@@ -39,18 +40,19 @@ func (d *Dir) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenRe
 func (d *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fusefs.Node, error) {
 	fmt.Printf("Lookup %s\n", req.Name)
 	req.Name = d.crfs.EncryptPath(req.Name)
-	n, err := d.Dir.Lookup(ctx, req, resp)
+	node, err := d.Dir.Lookup(ctx, req, resp)
 	if err != nil {
 		return nil, err
 	}
-	clueDir, ok := n.(*cluefs.Dir)
+	clueDir, ok := node.(*cluefs.Dir)
 	if ok {
 		return &Dir {
 			Dir: clueDir,
 			crfs: d.crfs,
 		}, nil
 	} else {
-		clueFile := n.(*cluefs.File)
+		resp.Attr.Size = d.crfs.PlainSize(resp.Attr.Size)
+		clueFile := node.(*cluefs.File)
 		return &File {
 			File: clueFile,
 			crfs: d.crfs,
diff --git a/frontend/file.go b/frontend/file.go
index 8014753..ef74491 100644
--- a/frontend/file.go
+++ b/frontend/file.go
@@ -56,12 +56,12 @@ func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenR
 }
 
 func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
-	iblocks := f.crfs.SplitRange(req.Offset, int64(req.Size))
+	iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(req.Size))
 	for _, ib := range iblocks {
 		var partReq fuse.ReadRequest
 		var partResp fuse.ReadResponse
 		o, l := ib.CiphertextRange()
-		partReq.Offset = o
+		partReq.Offset = int64(o)
 		partReq.Size = int(l)
 		partResp.Data = make([]byte, int(l))
 		err := f.File.Read(ctx, &partReq, &partResp)
@@ -82,7 +82,7 @@ func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadR
 func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
 	fmt.Printf("File.Write\n")
 	resp.Size = 0
-	iblocks := f.crfs.SplitRange(req.Offset, int64(len(req.Data)))
+	iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(len(req.Data)))
 	var blockData []byte
 	for _, ib := range iblocks {
 		if ib.IsPartial() {
@@ -91,7 +91,7 @@ func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.Wri
 			var readReq fuse.ReadRequest
 			var readResp fuse.ReadResponse
 			o, l := ib.PlaintextRange()
-			readReq.Offset = o
+			readReq.Offset = int64(o)
 			readReq.Size = int(l)
 			err := f.Read(ctx, &readReq, &readResp)
 			if err != nil {
@@ -109,7 +109,7 @@ func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.Wri
 		var partResp fuse.WriteResponse
 		o, _ := ib.CiphertextRange()
 		partReq.Data = ciphertext
-		partReq.Offset = o
+		partReq.Offset = int64(o)
 		err := f.File.Write(ctx, &partReq, &partResp)
 		if err != nil {
 			fmt.Printf("Write failure: %s\n", err.Error())
@@ -121,3 +121,13 @@ func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.Wri
 	}
 	return nil
 }
+
+func (f *File) Attr(ctx context.Context, attr *fuse.Attr) error {
+	fmt.Printf("Attr\n")
+	err := f.File.Node.Attr(ctx, attr)
+	if err != nil {
+		return err
+	}
+	attr.Size = f.crfs.PlainSize(attr.Size)
+	return nil
+}
diff --git a/frontend/node.go b/frontend/node.go
deleted file mode 100644
index f9b630c..0000000
--- a/frontend/node.go
+++ /dev/null
@@ -1,17 +0,0 @@
-package frontend
-
-import (
-	"fmt"
-	"github.com/rfjakob/cluefs/lib/cluefs"
-)
-
-type Node struct {
-	*cluefs.Node
-}
-
-func NewNode(parent string, name string, fs *FS) *Node {
-	fmt.Printf("NewNode\n")
-	return &Node{
-		Node: cluefs.NewNode(parent, name, fs.ClueFS),
-	}
-}