header

Author: N1ghtTheF0x

.gitmodules

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+<Project Sdk="Microsoft.NET.Sdk">
+    <ItemGroup>
+      <ProjectReference Include="IO\IO.csproj" />
+    </ItemGroup>
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <AssemblyName>ThemModdingHerds.$(MSBuildProjectName)</AssemblyName>
+    </PropertyGroup>
+</Project>

GFS.csproj

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GFS", "GFS.csproj", "{7906E5CF-8A30-4D37-B609-B3A0FA92BD21}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7906E5CF-8A30-4D37-B609-B3A0FA92BD21}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7906E5CF-8A30-4D37-B609-B3A0FA92BD21}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7906E5CF-8A30-4D37-B609-B3A0FA92BD21}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7906E5CF-8A30-4D37-B609-B3A0FA92BD21}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {9CC573F3-F460-40CE-8C90-9548402EB3DB}
+	EndGlobalSection
+EndGlobal

GFS.sln

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+using ThemModdingHerds.IO;
+using BinaryReader = ThemModdingHerds.IO.BinaryReader;
+
+namespace ThemModdingHerds.GFS;
+public class Header(uint offset,ulong entryCount)
+{
+    public readonly static string IDENTIFIER = "Reverge Package File";
+    public readonly static string VERSION = "1.1";
+    public uint DataOffset = offset;
+    public string Identifier = IDENTIFIER;
+    public string Version = VERSION;
+    public ulong EntryCount = entryCount;
+}
+public static class HeaderExt
+{
+    public static Header ReadHeader(this BinaryReader reader)
+    {
+        uint offset = reader.ReadUInt();
+        string id = reader.ReadPascal64String();
+        if(id != Header.IDENTIFIER)
+            throw new Exception("Header identifier mismatch");
+        string version = reader.ReadPascal64String();
+        if(version != Header.VERSION)
+            throw new Exception("Header version mismatch");
+        ulong entryCount = reader.ReadULong();
+        return new Header(offset,entryCount);
+    }
+}