Move changes from exp2 to main

This is largely a move to simplify a lot of the readers
Also further breaks out functions.

internal/inode/dir.go

@@ -0,0 +1,65 @@
+package inode
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+type Directory struct {
+	BlockStart uint32
+	LinkCount  uint32
+	Size       uint16
+	Offset     uint16
+	ParentNum  uint32
+}
+
+type eDirectoryInit struct {
+	LinkCount  uint32
+	Size       uint32
+	BlockStart uint32
+	ParentNum  uint32
+	IndCount   uint16
+	Offset     uint16
+	XattrInd   uint32
+}
+
+type EDirectory struct {
+	eDirectoryInit
+	Indexes []DirectoryIndex
+}
+
+type directoryIndexInit struct {
+	Ind      uint32
+	Start    uint32
+	NameSize uint32
+}
+
+type DirectoryIndex struct {
+	directoryIndexInit
+	Name []byte
+}
+
+func ReadDir(r io.Reader) (d Directory, err error) {
+	err = binary.Read(r, binary.LittleEndian, &d)
+	return
+}
+
+func ReadEDir(r io.Reader) (d EDirectory, err error) {
+	err = binary.Read(r, binary.LittleEndian, &d.eDirectoryInit)
+	if err != nil {
+		return
+	}
+	d.Indexes = make([]DirectoryIndex, d.IndCount)
+	for i := range d.Indexes {
+		err = binary.Read(r, binary.LittleEndian, &d.Indexes[i].directoryIndexInit)
+		if err != nil {
+			return
+		}
+		d.Indexes[i].Name = make([]byte, d.Indexes[i].NameSize+1)
+		err = binary.Read(r, binary.LittleEndian, &d.Indexes[i].Name)
+		if err != nil {
+			return
+		}
+	}
+	return
+}