From 772b57ca04b2dbe4ec163a8c2856f8af7bc5c2a5 Mon Sep 17 00:00:00 2001
From: madmaxoft <github@xoft.cz>
Date: Thu, 1 May 2014 18:00:10 +0200
Subject: Anvil saver pads data to 4K boundaries.

Fixes #524.
---
 src/WorldStorage/WSSAnvil.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/WorldStorage/WSSAnvil.cpp b/src/WorldStorage/WSSAnvil.cpp
index 33f34728e..f33178173 100644
--- a/src/WorldStorage/WSSAnvil.cpp
+++ b/src/WorldStorage/WSSAnvil.cpp
@@ -2672,6 +2672,11 @@ bool cWSSAnvil::cMCAFile::SetChunkData(const cChunkCoords & a_Chunk, const AStri
 		return false;
 	}
 	
+	// Add padding to 4K boundary:
+	size_t BytesWritten = a_Data.size() + MCA_CHUNK_HEADER_LENGTH;
+	static const char Padding[4095] = {0};
+	m_File.Write(Padding, 4096 - (BytesWritten % 4096));
+	
 	// Store the header:
 	ChunkSize = (a_Data.size() + MCA_CHUNK_HEADER_LENGTH + 4095) / 4096;  // Round data size *up* to nearest 4KB sector, make it a sector number
 	ASSERT(ChunkSize < 256);
-- 
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