format/commitgraph: Add initial commit-graph support

1 files changed, 14 insertions, 0 deletions

diff --git a/format/commitgraph/reader.go b/format/commitgraph/reader.go
new file mode 100644
index 00000000..b7af3282
--- /dev/null
+++ b/format/commitgraph/reader.go
@@ -0,0 +1,14 @@
+package commitgraph
+
+import "codeberg.org/lindenii/furgit/objectid"
+
+// Reader provides read-only access to one mmap-backed commit-graph snapshot.
+//
+// It is safe for concurrent read-only queries.
+type Reader struct {
+	algo        objectid.Algorithm
+	hashVersion uint8
+
+	layers []layer
+	total  uint32
+}