Improvements to pretty print routines for OBU headers

tests/ImageSharp.Tests/Formats/Heif/Av1/ObuFrameHeaderTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Collections;
 using System.Reflection;
 using System.Text;
 using SixLabors.ImageSharp.Formats.Heif.Av1;
@@ -101,24 +102,62 @@ public class ObuFrameHeaderTests
         Assert.Equal(PrettyPrintProperties(obuReader1.FrameHeader.TilesInfo), PrettyPrintProperties(obuReader2.FrameHeader.TilesInfo));
     }
 
-    private static string PrettyPrintProperties(object obj)
+    private static readonly char[] spaces = "                                                             ".ToCharArray();
+
+    private static string PrettyPrintProperties(object obj, int indent = 0)
     {
         StringBuilder builder = new();
         builder.Append(obj.GetType().Name);
         builder.AppendLine("{");
+        indent += 2;
         MemberInfo[] properties = obj.GetType().FindMembers(MemberTypes.Property, BindingFlags.Instance | BindingFlags.Public, null, null);
         foreach (MemberInfo member in properties)
         {
+            builder.Append(spaces, 0, indent);
             if (member is PropertyInfo property)
             {
                 builder.Append(property.Name);
                 builder.Append(" = ");
                 object value = property.GetValue(obj) ?? "NULL";
-                builder.AppendLine(value.ToString());
+                PrettyPrintValue(builder, value, indent);
             }
         }
 
+        indent -= 2;
+        builder.Append(spaces, 0, indent);
         builder.AppendLine("}");
         return builder.ToString();
     }
+
+    private static void PrettyPrintValue(StringBuilder builder, object value, int indent)
+    {
+        if (value.GetType() == typeof(string))
+        {
+            builder.AppendLine(value.ToString());
+        }
+        else if (value.GetType().IsArray)
+        {
+            builder.AppendLine("[");
+            indent += 2;
+            builder.Append(spaces, 0, indent);
+            Type elementType = value.GetType().GetElementType();
+            IList list = value as IList;
+            foreach (object item in list)
+            {
+                PrettyPrintValue(builder, item, indent);
+            }
+
+            indent -= 2;
+            builder.Append(spaces, 0, indent);
+            builder.AppendLine("]");
+        }
+        else if (value.GetType().IsClass)
+        {
+            builder.AppendLine(PrettyPrintProperties(value, indent));
+        }
+        else
+        {
+            builder.AppendLine(value.ToString());
+        }
+    }
 }