From 60d531834836f422d9c15edc67742afb6320b469 Mon Sep 17 00:00:00 2001
From: 7H3LaughingMan <7H3LaughingMan@proton.me>
Date: Tue, 22 Apr 2025 11:43:01 -0500
Subject: [PATCH] Add ZStd Support - Uses ZstdSharp.Port

---
 src/DotTiled/DotTiled.csproj                         | 4 ++++
 src/DotTiled/Serialization/Helpers.cs                | 6 ++++++
 src/DotTiled/Serialization/Tmx/TmxReaderBase.Data.cs | 8 +++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/DotTiled/DotTiled.csproj b/src/DotTiled/DotTiled.csproj
index 6e8de2a..c91aeac 100644
--- a/src/DotTiled/DotTiled.csproj
+++ b/src/DotTiled/DotTiled.csproj
@@ -26,4 +26,8 @@
     <None Include="../../LICENSE" Pack="true" PackagePath="" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="ZstdSharp.Port" Version="0.8.5" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/DotTiled/Serialization/Helpers.cs b/src/DotTiled/Serialization/Helpers.cs
index d716293..2038401 100644
--- a/src/DotTiled/Serialization/Helpers.cs
+++ b/src/DotTiled/Serialization/Helpers.cs
@@ -46,6 +46,12 @@ internal static partial class Helpers
     return ReadMemoryStreamAsInt32Array(decompressedStream);
   }
 
+  internal static uint[] DecompressZStd(MemoryStream stream)
+  {
+    using var decompressedStream = new ZstdSharp.DecompressionStream(stream);
+    return ReadMemoryStreamAsInt32Array(decompressedStream);
+  }
+
   internal static uint[] ReadBytesAsInt32Array(byte[] bytes)
   {
     var intArray = new uint[bytes.Length / 4];
diff --git a/src/DotTiled/Serialization/Tmx/TmxReaderBase.Data.cs b/src/DotTiled/Serialization/Tmx/TmxReaderBase.Data.cs
index a05bbd0..6df7942 100644
--- a/src/DotTiled/Serialization/Tmx/TmxReaderBase.Data.cs
+++ b/src/DotTiled/Serialization/Tmx/TmxReaderBase.Data.cs
@@ -78,7 +78,7 @@ public abstract partial class TmxReaderBase
     {
       DataCompression.GZip => DecompressGZip(bytes),
       DataCompression.ZLib => DecompressZLib(bytes),
-      DataCompression.ZStd => throw new NotSupportedException("ZStd compression is not supported."),
+      DataCompression.ZStd => DecompressZStd(bytes),
       _ => throw new XmlException("Invalid compression")
     };
 
@@ -117,4 +117,10 @@ public abstract partial class TmxReaderBase
     using var decompressedStream = new ZLibStream(stream, CompressionMode.Decompress);
     return ReadMemoryStreamAsInt32Array(decompressedStream);
   }
+
+  internal static uint[] DecompressZStd(MemoryStream stream)
+  {
+    using var decompressedStream = new ZstdSharp.DecompressionStream(stream);
+    return ReadMemoryStreamAsInt32Array(decompressedStream);
+  }
 }