From 8808b54c88ec3f3248b5fe1e2c2463e608bd1d6d Mon Sep 17 00:00:00 2001
From: morkt <muvluv.ru@gmail.com>
Date: Thu, 18 Aug 2016 14:59:17 +0400
Subject: [PATCH] (BmpFormat.ReadMetaData): some fault-tolerance.

---
 GameRes/ImageBMP.cs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/GameRes/ImageBMP.cs b/GameRes/ImageBMP.cs
index f68279bd..cce3af76 100644
--- a/GameRes/ImageBMP.cs
+++ b/GameRes/ImageBMP.cs
@@ -110,13 +110,18 @@ namespace GameRes
         {
             int c1 = stream.ReadByte();
             int c2 = stream.ReadByte();
-            if (0x42 != c1 || 0x4d != c2)
+            if ('B' != c1 || 'M' != c2)
                 return null;
             using (var file = new ArcView.Reader (stream))
             {
                 uint size = file.ReadUInt32();
                 if (size < 14+40)
-                    return null;
+                {
+                    // some otherwise valid bitmaps have size field set to zero
+                    if (size != 0 || !stream.CanSeek)
+                        return null;
+                    size = (uint)stream.Length;
+                }
                 SkipBytes (file, 8);
                 uint header_size = file.ReadUInt32();
                 if (header_size < 40 || size-14 < header_size)