From 1a66ddf71af0f9bc3fcba5d67140f429251210d9 Mon Sep 17 00:00:00 2001
From: Mikko Mononen <memononen@gmail.com>
Date: Mon, 19 Dec 2011 19:31:39 +0000
Subject: [PATCH] Partial checkin or tile cache endian swap.

---
 .../Include/DetourTileCacheBuilder.h          |  6 ++++
 .../Source/DetourTileCacheBuilder.cpp         | 36 +++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/DetourTileCache/Include/DetourTileCacheBuilder.h b/DetourTileCache/Include/DetourTileCacheBuilder.h
index edeccdf..a9148f9 100644
--- a/DetourTileCache/Include/DetourTileCacheBuilder.h
+++ b/DetourTileCache/Include/DetourTileCacheBuilder.h
@@ -136,5 +136,11 @@ dtStatus dtBuildTileCachePolyMesh(dtTileCacheAlloc* alloc,
 								  dtTileCacheContourSet& lcset,
 								  dtTileCachePolyMesh& mesh);
 
+/// Swaps the endianess of the compressed tile data's header (#dtTileCacheLayerHeader).
+/// Tile layer data does not need endian swapping as it consits only of bytes.
+///  @param[in,out]	data		The tile data array.
+///  @param[in]		dataSize	The size of the data array.
+bool dtTileCacheHeaderSwapEndian(unsigned char* data, const int dataSize);
+
 
 #endif // DETOURTILECACHEBUILDER_H
diff --git a/DetourTileCache/Source/DetourTileCacheBuilder.cpp b/DetourTileCache/Source/DetourTileCacheBuilder.cpp
index a8a6d74..4150638 100644
--- a/DetourTileCache/Source/DetourTileCacheBuilder.cpp
+++ b/DetourTileCache/Source/DetourTileCacheBuilder.cpp
@@ -2103,3 +2103,39 @@ dtStatus dtDecompressTileCacheLayer(dtTileCacheAlloc* alloc, dtTileCacheCompress
 	return DT_SUCCESS;
 }
 
+
+
+bool dtTileCacheHeaderSwapEndian(unsigned char* data, const int dataSize)
+{
+	dtTileCacheLayerHeader* header = (dtTileCacheLayerHeader*)data;
+	
+	int swappedMagic = DT_TILECACHE_MAGIC;
+	int swappedVersion = DT_TILECACHE_VERSION;
+	dtSwapEndian(&swappedMagic);
+	dtSwapEndian(&swappedVersion);
+	
+	if ((header->magic != DT_TILECACHE_MAGIC || header->version != DT_TILECACHE_VERSION) &&
+		(header->magic != swappedMagic || header->version != swappedVersion))
+	{
+		return false;
+	}
+	
+	dtSwapEndian(&header->magic);
+	dtSwapEndian(&header->version);
+	dtSwapEndian(&header->tx);
+	dtSwapEndian(&header->ty);
+	dtSwapEndian(&header->tlayer);
+	dtSwapEndian(&header->bmin[0]);
+	dtSwapEndian(&header->bmin[1]);
+	dtSwapEndian(&header->bmin[2]);
+	dtSwapEndian(&header->bmax[0]);
+	dtSwapEndian(&header->bmax[1]);
+	dtSwapEndian(&header->bmax[2]);
+	dtSwapEndian(&header->hmin);
+	dtSwapEndian(&header->hmax);
+	
+	// width, height, minx, maxx, miny, maxy are unsigned char, no need to swap.
+	
+	return true;
+}
+