Re-write data fullreader & reader

Moved directory and the rest of the inodes to manual decoding

low/directory/directory.go

@@ -11,12 +11,45 @@ type header struct {
 	Num        uint32
 }
 
-type decEntry struct {
+func readHeader(r io.Reader) (h header, err error) {
+	dat := make([]byte, 12)
+	_, err = r.Read(dat)
+	if err != nil {
+		return
+	}
+	h.Count = binary.LittleEndian.Uint32(dat)
+	h.BlockStart = binary.LittleEndian.Uint32(dat[4:])
+	h.Num = binary.LittleEndian.Uint32(dat[8:])
+	return
+}
+
+type dirEntry struct {
 	Offset    uint16
 	NumOffset int16
 	InodeType uint16
 	NameSize  uint16
-	// Name []byte (not decoded along with decEntry)
+	Name      []byte
+}
+
+func readEntry(r io.Reader) (e dirEntry, err error) {
+	dat := make([]byte, 8)
+	_, err = r.Read(dat)
+	if err != nil {
+		return
+	}
+	e.Offset = binary.LittleEndian.Uint16(dat)
+	_, err = binary.Decode(dat[2:], binary.LittleEndian, &e.NumOffset)
+	if err != nil {
+		return
+	}
+	e.InodeType = binary.LittleEndian.Uint16(dat[4:])
+	e.NameSize = binary.LittleEndian.Uint16(dat[6:])
+	e.Name = make([]byte, e.NameSize+1)
+	_, err = r.Read(e.Name)
+	if err != nil {
+		return
+	}
+	return
 }
 
 type Entry struct {
@@ -31,20 +64,15 @@ func ReadDirectory(r io.Reader, size uint32) (out []Entry, err error) {
 	size -= 3
 	var curRead uint32
 	var h header
-	var de decEntry
+	var de dirEntry
 	for curRead < size {
-		err = binary.Read(r, binary.LittleEndian, &h)
+		h, err = readHeader(r)
 		if err != nil {
 			return
 		}
 		curRead += 12
 		for i := uint32(0); i < h.Count+1 && curRead < size; i++ {
-			err = binary.Read(r, binary.LittleEndian, &de)
-			if err != nil {
-				return
-			}
-			nameTmp := make([]byte, de.NameSize+1)
-			err = binary.Read(r, binary.LittleEndian, &nameTmp)
+			de, err = readEntry(r)
 			if err != nil {
 				return
 			}
@@ -52,7 +80,7 @@ func ReadDirectory(r io.Reader, size uint32) (out []Entry, err error) {
 			out = append(out, Entry{
 				BlockStart: h.BlockStart,
 				Offset:     de.Offset,
-				Name:       string(nameTmp),
+				Name:       string(de.Name),
 				InodeType:  de.InodeType,
 				Num:        h.Num + uint32(de.NumOffset),
 			})