From 90279506d10046800e5e72a991b5f19208b35636 Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Thu, 23 Feb 2017 16:08:16 +0100
Subject: [PATCH] Ported new map block offset in version >= 27 from C++ mapper.
 Needs testing. See
 https://github.com/minetest/minetestmapper/commit/21444d00c35dc6896ffc27af7da38d8a296178fd

---
 common/block.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/common/block.go b/common/block.go
index 8efae8c..b73a41c 100644
--- a/common/block.go
+++ b/common/block.go
@@ -105,9 +105,14 @@ func NewDecodedBlock(data []byte, colors *Colors) (db *DecodedBlock, err error)
 
 	uncompressedLen := nodeCount * (contentWidth + paramsWidth)
 
-	offset := 2
-	if version >= 22 {
+	var offset int
+	switch {
+	case version >= 27:
+		offset = 6
+	case version >= 22:
 		offset = 4
+	default:
+		offset = 2
 	}
 
 	zr := zlibReaderPool.Get().(interface {