Bugfixes and cleanu

* Fixed boundary calculation errors for odd-sized vhdx images
* Fixed parameter name mistake with ArgumentOutOfRangeException

Author: LTRData

Library/DiscUtils.Vhdx/ContentStream.cs

@@ -606,14 +606,17 @@ protected override void Dispose(bool disposing)
     private IEnumerable<StreamExtent> GetExtentsRaw(long start, long count)
     {
         var chunkSize = (1L << 23) * _metadata.LogicalSectorSize;
-        var chunkRatio = (int)(chunkSize / _metadata.FileParameters.BlockSize);
 
         var pos = MathUtilities.RoundDown(start, chunkSize);
 
         while (pos < start + count)
         {
             var chunk = GetChunk(pos, out _, out _, out _);
 
+            var thisChunkSize = Math.Min(chunkSize, start + count - pos);
+
+            var chunkRatio = (int)(thisChunkSize / _metadata.FileParameters.BlockSize);
+
             for (var i = 0; i < chunkRatio; ++i)
             {
                 switch (chunk.GetBlockStatus(i))

Library/DiscUtils.Vhdx/FreeSpaceTable.cs

@@ -128,7 +128,7 @@ private void ValidateRange(long start, long length, string method)
 
         if (start < 0 || start > _fileSize || length > _fileSize - start)
         {
-            throw new ArgumentOutOfRangeException($"Attempt to {method} space outside of file range");
+            throw new ArgumentOutOfRangeException(nameof(start), $"Attempt to {method} space outside of file range");
         }
     }
 }