1 files changed, 35 insertions, 0 deletions
diff --git a/pack.h b/pack.h
new file mode 100644
index 0000000..694e0c5
--- /dev/null
+++ b/pack.h
@@ -0,0 +1,35 @@
+#ifndef PACK_H
+#define PACK_H
+
+/*
+ * The packed object type is stored in 3 bits.
+ * The type value 0 is a reserved prefix if ever there is more than 7
+ * object types, or any future format extensions.
+ */
+enum object_type {
+	OBJ_EXT = 0,
+	OBJ_COMMIT = 1,
+	OBJ_TREE = 2,
+	OBJ_BLOB = 3,
+	OBJ_TAG = 4,
+	/* 5/6 for future expansion */
+	OBJ_DELTA = 7,
+};
+
+/*
+ * Packed object header
+ */
+#define PACK_SIGNATURE 0x5041434b	/* "PACK" */
+#define PACK_VERSION 2
+#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
+struct pack_header {
+	unsigned int hdr_signature;
+	unsigned int hdr_version;
+	unsigned int hdr_entries;
+};
+
+extern int verify_pack(struct packed_git *, int);
+extern int check_reuse_pack_delta(struct packed_git *, unsigned long,
+				  unsigned char *, unsigned long *,
+				  enum object_type *);
+#endif