From eec690e4e2e11032e75fa9ea6c24d4ed53a4e8e3 Mon Sep 17 00:00:00 2001
From: wfowler <will.fowler4201@gmail.com>
Date: Sun, 18 Apr 2021 22:03:27 -0600
Subject: [PATCH] Add constructor to BrushSide to copy another BrushSide using
 any given format.

---
 LibBSP/Source/Structs/BSP/BrushSide.cs | 43 ++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/LibBSP/Source/Structs/BSP/BrushSide.cs b/LibBSP/Source/Structs/BSP/BrushSide.cs
index 9983557..ac5695e 100644
--- a/LibBSP/Source/Structs/BSP/BrushSide.cs
+++ b/LibBSP/Source/Structs/BSP/BrushSide.cs
@@ -160,7 +160,7 @@ namespace LibBSP {
 						return BitConverter.ToSingle(Data, 0);
 					}
 					default: {
-						return float.NaN;
+						return 0;
 					}
 				}
 			}
@@ -484,7 +484,46 @@ namespace LibBSP {
 			Data = data;
 			Parent = parent;
 		}
-		
+
+		/// <summary>
+		/// Creates a new <see cref="BrushSide"/> by copying the fields in <paramref name="source"/>, using
+		/// <paramref name="parent"/> to get <see cref="LibBSP.MapType"/> and <see cref="LumpInfo.version"/>
+		/// to use when creating the new <see cref="BrushSide"/>.
+		/// If the <paramref name="parent"/>'s <see cref="BSP"/>'s <see cref="LibBSP.MapType"/> is different from
+		/// the one from <paramref name="source"/>, it does not matter, because fields are copied by name.
+		/// </summary>
+		/// <param name="source">The <see cref="BrushSide"/> to copy.</param>
+		/// <param name="parent">
+		/// The <see cref="ILump"/> to use as the <see cref="Parent"/> of the new <see cref="BrushSide"/>.
+		/// Use <c>null</c> to use the <paramref name="source"/>'s <see cref="Parent"/> instead.
+		/// </param>
+		public BrushSide(BrushSide source, ILump parent) {
+			Parent = parent;
+
+			if (parent != null && parent.Bsp != null) {
+				if (source.Parent != null && source.Parent.Bsp != null && source.Parent.Bsp.version == parent.Bsp.version && source.LumpVersion == parent.LumpInfo.version) {
+					Data = new byte[source.Data.Length];
+					Array.Copy(source.Data, Data, source.Data.Length);
+					return;
+				} else {
+					Data = new byte[GetStructLength(parent.Bsp.version, parent.LumpInfo.version)];
+				}
+			} else {
+				if (source.Parent != null && source.Parent.Bsp != null) {
+					Data = new byte[GetStructLength(source.Parent.Bsp.version, source.Parent.LumpInfo.version)];
+				} else {
+					Data = new byte[GetStructLength(MapType.Undefined, 0)];
+				}
+			}
+
+			PlaneIndex = source.PlaneIndex;
+			TextureIndex = source.TextureIndex;
+			FaceIndex = source.FaceIndex;
+			DisplacementIndex = source.DisplacementIndex;
+			IsBevel = source.IsBevel;
+			IsThin = source.IsThin;
+		}
+
 		/// <summary>
 		/// Factory method to parse a <c>byte</c> array into a <see cref="Lump{BrushSide}"/>.
 		/// </summary>