From 7657a9d4652c0385c4ce6e94e279cb61aec37e6d Mon Sep 17 00:00:00 2001
From: Ryszard Knop <dragoon@dragonic.eu>
Date: Sat, 4 Jul 2020 22:25:00 +0200
Subject: [PATCH] Add .NET Core support

This lets dspatch run under Linux/macOS natively without Mono.
Do "dotnet run <args>" next to dspatch-core.csproj and that's it.
---
 dspatch/Nitro/ARM9.cs       | 27 +++++++++++++++++++--------
 dspatch/dspatch-core.csproj | 12 ++++++++++++
 2 files changed, 31 insertions(+), 8 deletions(-)
 create mode 100644 dspatch/dspatch-core.csproj

diff --git a/dspatch/Nitro/ARM9.cs b/dspatch/Nitro/ARM9.cs
index 3301ba8..b0e2dfd 100644
--- a/dspatch/Nitro/ARM9.cs
+++ b/dspatch/Nitro/ARM9.cs
@@ -153,19 +153,30 @@ private static uint FindModuleParams(byte[] Data)
 			return (uint)IndexOf(Data, new byte[] { 0x21, 0x06, 0xC0, 0xDE, 0xDE, 0xC0, 0x06, 0x21 }) - 0x1C;
 		}
 
-		private static unsafe long IndexOf(byte[] Data, byte[] Search)
+		private static long IndexOf(byte[] Data, byte[] Search)
 		{
-			fixed (byte* H = Data) fixed (byte* N = Search)
+			long MaxOffset = Data.LongLength - Search.LongLength + 1;
+			if (MaxOffset <= 0)
 			{
-				long i = 0;
-				for (byte* hNext = H, hEnd = H + Data.LongLength; hNext < hEnd; i++, hNext++)
+				throw new ArgumentOutOfRangeException(nameof(Search));
+			}
+
+			for (long Offset = 0; Offset < MaxOffset; Offset++)
+			{
+				bool Found = true;
+				for (long patternOffset = 0; patternOffset < Search.LongLength; patternOffset++)
 				{
-					bool Found = true;
-					for (byte* hInc = hNext, nInc = N, nEnd = N + Search.LongLength; Found && nInc < nEnd; Found = *nInc == *hInc, nInc++, hInc++) ;
-					if (Found) return i;
+					if (Data[Offset + patternOffset] != Search[patternOffset])
+					{
+						Found = false;
+						break;
+					}
 				}
-				return -1;
+
+				if (Found) return Offset;
 			}
+
+			throw new Exception("No target module params offset found!");
 		}
 	}
 }
diff --git a/dspatch/dspatch-core.csproj b/dspatch/dspatch-core.csproj
new file mode 100644
index 0000000..8056fd3
--- /dev/null
+++ b/dspatch/dspatch-core.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>dspatch</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Remove="Properties\**" />
+  </ItemGroup>
+
+</Project>