From d0ee300e41dc33d093ee78f9d4ae4da697908cc4 Mon Sep 17 00:00:00 2001
From: Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com>
Date: Sat, 5 Nov 2022 16:49:04 +0400
Subject: Minor checks and comments

---
 FdsDiskFile.cs | 3 ++-
 FdsDiskSide.cs | 1 -
 FdsFile.cs     | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/FdsDiskFile.cs b/FdsDiskFile.cs
index 88e3dce..e972fd2 100644
--- a/FdsDiskFile.cs
+++ b/FdsDiskFile.cs
@@ -4,7 +4,7 @@ using System.Linq;
 namespace com.clusterrr.Famicom.Containers
 {
     /// <summary>
-    /// FDS file - header and data
+    /// File on FDS disk - header and data
     /// </summary>
     public class FdsDiskFile
     {
@@ -55,6 +55,7 @@ namespace com.clusterrr.Famicom.Containers
                 HeaderBlock.FileSize = (ushort)DataBlock.Data.Count();
             }
         }
+
         /// <summary>
         /// Construcor
         /// </summary>
diff --git a/FdsDiskSide.cs b/FdsDiskSide.cs
index 1a373d9..0d08639 100644
--- a/FdsDiskSide.cs
+++ b/FdsDiskSide.cs
@@ -89,7 +89,6 @@ namespace com.clusterrr.Famicom.Containers
         public byte FileAmount { get => fileAmountBlock.FileAmount; set => fileAmountBlock.FileAmount = value; }
 
         readonly IList<FdsDiskFile> files;
-
         /// <summary>
         /// Files on disk
         /// </summary>
diff --git a/FdsFile.cs b/FdsFile.cs
index 35e12a5..000849b 100644
--- a/FdsFile.cs
+++ b/FdsFile.cs
@@ -39,6 +39,7 @@ namespace com.clusterrr.Famicom.Containers
         {
             if (data[0] == (byte)'F' && data[1] == (byte)'D' && data[2] == (byte)'S' && data[3] == 0x1A)
                 data = data.Skip(16).ToArray(); // skip header
+            if (data.Length % 65500 != 0) throw new InvalidDataException("Invalid FDS image: the size must be divisible by 65500");
             for (int i = 0; i < data.Length; i += 65500)
             {
                 var sideData = data.Skip(i).Take(66500).ToArray();
-- 
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