1 files changed, 41 insertions, 0 deletions
diff --git a/object/id/object_format_ops.go b/object/id/object_format_ops.go
new file mode 100644
index 00000000..76077235
--- /dev/null
+++ b/object/id/object_format_ops.go
@@ -0,0 +1,41 @@
+package id
+
+import "hash"
+
+// HexLen returns the encoded hexadecimal length.
+func (objectFormat ObjectFormat) HexLen() int {
+	return objectFormat.Size() * 2
+}
+
+// Size returns the hash size in bytes.
+func (objectFormat ObjectFormat) Size() int {
+	return objectFormat.details().size
+}
+
+// New returns a new hash.Hash for this object format.
+func (objectFormat ObjectFormat) New() (hash.Hash, error) {
+	newFn := objectFormat.details().new
+	if newFn == nil {
+		return nil, ErrInvalidObjectFormat
+	}
+
+	return newFn(), nil
+}
+
+// String returns the canonical object format name.
+func (objectFormat ObjectFormat) String() string {
+	return objectFormat.details().name
+}
+
+// Sum computes an object ID from raw data using the selected object format.
+func (objectFormat ObjectFormat) Sum(data []byte) ObjectID {
+	return objectFormat.details().sum(data)
+}
+
+// Zero returns the all-zero object ID for this object format.
+func (objectFormat ObjectFormat) Zero() ObjectID {
+	return ObjectID{
+		objectFormat: objectFormat,
+		data:         [maxObjectIDSize]byte{},
+	}
+}