1 files changed, 104 insertions, 0 deletions
diff --git a/pkg/btrfs/btrfsitem/item_dir.go b/pkg/btrfs/btrfsitem/item_dir.go
new file mode 100644
index 0000000..2e0529e
--- /dev/null
+++ b/pkg/btrfs/btrfsitem/item_dir.go
@@ -0,0 +1,104 @@
+package btrfsitem
+
+import (
+	"fmt"
+
+	"lukeshu.com/btrfs-tools/pkg/binstruct"
+	"lukeshu.com/btrfs-tools/pkg/btrfs/internal"
+)
+
+type DirList []Dir // DIR_ITEM=84, DIR_INDEX=96, XATTR_ITEM=24
+
+func (o *DirList) UnmarshalBinary(dat []byte) (int, error) {
+	n := 0
+	for n < len(dat) {
+		var ref Dir
+		_n, err := binstruct.Unmarshal(dat, &ref)
+		n += _n
+		if err != nil {
+			return n, err
+		}
+		*o = append(*o, ref)
+	}
+	return n, nil
+}
+
+func (o DirList) MarshalBinary() ([]byte, error) {
+	var ret []byte
+	for _, ref := range o {
+		bs, err := binstruct.Marshal(ref)
+		ret = append(ret, bs...)
+		if err != nil {
+			return ret, err
+		}
+	}
+	return ret, nil
+}
+
+type Dir struct {
+	Location      internal.Key `bin:"off=0x0, siz=0x11"`
+	TransID       int64        `bin:"off=0x11, siz=8"`
+	DataLen       uint16       `bin:"off=0x19, siz=2"`
+	NameLen       uint16       `bin:"off=0x1b, siz=2"`
+	Type          FileType     `bin:"off=0x1d, siz=1"`
+	binstruct.End `bin:"off=0x1e"`
+	Data          []byte `bin:"-"`
+	Name          []byte `bin:"-"`
+}
+
+func (o *Dir) UnmarshalBinary(dat []byte) (int, error) {
+	n, err := binstruct.UnmarshalWithoutInterface(dat, o)
+	if err != nil {
+		return n, err
+	}
+	o.Data = dat[n : n+int(o.DataLen)]
+	n += int(o.DataLen)
+	o.Name = dat[n : n+int(o.NameLen)]
+	n += int(o.NameLen)
+	return n, nil
+}
+
+func (o Dir) MarshalBinary() ([]byte, error) {
+	o.DataLen = uint16(len(o.Data))
+	o.NameLen = uint16(len(o.Name))
+	dat, err := binstruct.MarshalWithoutInterface(o)
+	if err != nil {
+		return dat, err
+	}
+	dat = append(dat, o.Data...)
+	dat = append(dat, o.Name...)
+	return dat, nil
+}
+
+type FileType uint8
+
+const (
+	BTRFS_FT_UNKNOWN  = FileType(0)
+	BTRFS_FT_REG_FILE = FileType(1)
+	BTRFS_FT_DIR      = FileType(2)
+	BTRFS_FT_CHRDEV   = FileType(3)
+	BTRFS_FT_BLKDEV   = FileType(4)
+	BTRFS_FT_FIFO     = FileType(5)
+	BTRFS_FT_SOCK     = FileType(6)
+	BTRFS_FT_SYMLINK  = FileType(7)
+	BTRFS_FT_XATTR    = FileType(8)
+	BTRFS_FT_MAX      = FileType(9)
+)
+
+func (ft FileType) String() string {
+	names := map[FileType]string{
+		BTRFS_FT_UNKNOWN:  "UNKNOWN",
+		BTRFS_FT_REG_FILE: "REG_FILE",
+		BTRFS_FT_DIR:      "DIR",
+		BTRFS_FT_CHRDEV:   "CHRDEV",
+		BTRFS_FT_BLKDEV:   "BLKDEV",
+		BTRFS_FT_FIFO:     "FIFO",
+		BTRFS_FT_SOCK:     "SOCK",
+		BTRFS_FT_SYMLINK:  "SYMLINK",
+		BTRFS_FT_XATTR:    "XATTR",
+	}
+	if name, ok := names[ft]; ok {
+		return name
+	}
+	return fmt.Sprintf("DIR_ITEM.%d", uint8(ft))
+}