1 files changed, 9 insertions, 0 deletions
diff --git a/format/packfile/header.go b/format/packfile/header.go
new file mode 100644
index 00000000..bc859a55
--- /dev/null
+++ b/format/packfile/header.go
@@ -0,0 +1,9 @@
+package packfile
+
+// Signature is the 4-byte "PACK" magic at the start of pack files.
+const Signature = 0x5041434b
+
+// VersionSupported reports whether one pack version is supported.
+func VersionSupported(version uint32) bool {
+	return version == 2 || version == 3
+}