From d3d9a99028691e6212bdd6adc21db9c906071acd Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sun, 14 Nov 2004 11:45:15 +0000
Subject: [PATCH] Corrected INDEX_VERSION, documented the rules and added
 CUSTOM_INDEX_VERSION.

---
 lib/index.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/index.h b/lib/index.h
index 7e91ced4..b1796c2a 100644
--- a/lib/index.h
+++ b/lib/index.h
@@ -9,7 +9,17 @@
 
 #include "custom/lib/custom.h"
 
-#define INDEX_VERSION (0x34010000+sizeof(struct card_attr))	/* Increase with each incompatible change in index format */
+/*
+ *  Magic number which should help to avoid mixing incompatible indices.
+ *  Syntax: <magic-byte><version><revision><custom-dependent-part>
+ *  Remember to increase with each change of index format.
+ */
+
+#ifndef CUSTOM_INDEX_VERSION
+#define CUSTOM_INDEX_VERSION sizeof(struct card_attr)
+#endif
+
+#define INDEX_VERSION (0x32340100+CUSTOM_INDEX_VERSION)
 
 /*
  *  Words
-- 
2.39.2