more

1 files changed, 44 insertions, 0 deletions

diff --git a/pkg/btrfs/btrfsitem/item_metadata.go b/pkg/btrfs/btrfsitem/item_metadata.go
new file mode 100644
index 0000000..7bfe677
--- /dev/null
+++ b/pkg/btrfs/btrfsitem/item_metadata.go
@@ -0,0 +1,44 @@
+package btrfsitem
+
+import (
+	"lukeshu.com/btrfs-tools/pkg/binstruct"
+)
+
+// Metadata is like Extent, but doesn't have .Info.
+type Metadata struct { // METADATA_ITEM=169
+	Head ExtentHeader
+	Refs []ExtentInlineRef
+}
+
+func (o *Metadata) UnmarshalBinary(dat []byte) (int, error) {
+	n, err := binstruct.Unmarshal(dat, &o.Head)
+	if err != nil {
+		return n, err
+	}
+	o.Refs = nil
+	for n < len(dat) {
+		var ref ExtentInlineRef
+		_n, err := binstruct.Unmarshal(dat[n:], &ref)
+		n += _n
+		o.Refs = append(o.Refs, ref)
+		if err != nil {
+			return n, err
+		}
+	}
+	return n, nil
+}
+
+func (o Metadata) MarshalBinary() ([]byte, error) {
+	dat, err := binstruct.Marshal(o.Head)
+	if err != nil {
+		return dat, err
+	}
+	for _, ref := range o.Refs {
+		bs, err := binstruct.Marshal(ref)
+		dat = append(dat, bs...)
+		if err != nil {
+			return dat, err
+		}
+	}
+	return dat, nil
+}