baseline: OpenMU upstream b5a0961 (fresh source)

src/Persistence/Initialization/TerrainUpdateHelper.cs

@@ -0,0 +1,74 @@
+// <copyright file="TerrainUpdateHelper.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Persistence.Initialization;
+
+using System.Diagnostics;
+using System.IO;
+using System.Reflection;
+using MUnique.OpenMU.DataModel.Configuration;
+
+/// <summary>
+/// Update helper for terrain data.
+/// </summary>
+internal static class TerrainUpdateHelper
+{
+    /// <summary>
+    /// Updates the <see cref="GameMapDefinition.TerrainData"/> from the embedded resources.
+    /// </summary>
+    /// <param name="gameMapDefinition">The game map definition.</param>
+    /// <param name="terrainVersionPrefix">The terrain version prefix.</param>
+    public static void UpdateTerrainFromResources(this GameMapDefinition gameMapDefinition, string terrainVersionPrefix = "")
+    {
+        var assembly = Assembly.GetExecutingAssembly();
+        var terrainResourceName = gameMapDefinition.GetTerrainFileName(terrainVersionPrefix);
+        if (string.IsNullOrWhiteSpace(terrainResourceName))
+        {
+            return;
+        }
+
+        using var stream = assembly.GetManifestResourceStream(terrainResourceName);
+        if (stream is not null)
+        {
+            using var reader = new BinaryReader(stream);
+            var terrainData = reader.ReadBytes(3 * ushort.MaxValue);
+            gameMapDefinition.TerrainData = terrainData;
+        }
+        else
+        {
+            Debug.Fail($"Couldn't find terrain resource {terrainResourceName} for map {gameMapDefinition.Name}.");
+        }
+    }
+
+    private static string GetTerrainFileName(this GameMapDefinition gameMapDefinition, string terrainVersionPrefix = "")
+    {
+        var assembly = Assembly.GetExecutingAssembly();
+        var resourceNames = assembly.GetManifestResourceNames();
+        for (var mapNumber = gameMapDefinition.Number + 1; mapNumber > 0 && mapNumber > gameMapDefinition.Number - 10; mapNumber--)
+        {
+            var candidate = $"{assembly.GetName().Name}.Resources.{terrainVersionPrefix}Terrain{mapNumber}{(gameMapDefinition.Discriminator > 0 ? ("_" + gameMapDefinition.Discriminator) : string.Empty)}.att";
+            if (resourceNames.Contains(candidate))
+            {
+                return candidate;
+            }
+
+            if (gameMapDefinition.Discriminator > 0)
+            {
+                var candidate2 = $"{assembly.GetName().Name}.Resources.{terrainVersionPrefix}Terrain{mapNumber}.att";
+                if (resourceNames.Contains(candidate2))
+                {
+                    return candidate2;
+                }
+            }
+
+            if (!char.IsDigit(gameMapDefinition.Name.ValueInNeutralLanguageAsSpan[^1]))
+            {
+                break;
+            }
+        }
+
+        Debug.Fail("Couldn't find terrain resource name for map " + gameMapDefinition.Name);
+        return string.Empty;
+    }
+}