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Implement WebGL/WebAssembly handler #482

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Implement WebGL/WebAssembly handler #482

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3 changes: 2 additions & 1 deletion Cpp2IL/Cpp2IL.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@
<TrimMode>partial</TrimMode>
<PublishTrimmed>true</PublishTrimmed>
</PropertyGroup>

<ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">
<TrimmerRootAssembly Include="System.Runtime" />
<TrimmerRootAssembly Include="System.Private.CoreLib" />
Expand All @@ -31,6 +31,7 @@
</PropertyGroup>

<ItemGroup>
<PackageReference Include="System.Text.Json" Version="9.0.2" />
<PackageReference Include="CommandLineParser" Version="2.9.1" />
<PackageReference Include="Pastel" Version="6.0.1" />
<PackageReference Include="PolySharp" Version="1.15.0">
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93 changes: 91 additions & 2 deletions Cpp2IL/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@
using System.Linq;
using System.Reflection;
using System.Runtime;
using System.Text;
using System.Text.Json;
using CommandLine;
using Cpp2IL.Core;
using Cpp2IL.Core.Api;
Expand Down Expand Up @@ -35,7 +37,7 @@
{
if (string.IsNullOrEmpty(gamePath))
throw new SoftException("No force options provided, and no game path was provided either. Please provide a game path or use the --force- options.");

//Somehow the above doesn't tell .net that gamePath can't be null on net472, so we do this stupid thing to avoid nullable warnings
#if NET472
gamePath = gamePath!;
Expand All @@ -44,17 +46,19 @@
Logger.VerboseNewline("Beginning path resolution...");

if (Directory.Exists(gamePath) && File.Exists(Path.Combine(gamePath, "Contents/Frameworks/GameAssembly.dylib")))
HandleMacOSGamePath(gamePath, inputExeName, ref args);

Check warning on line 49 in Cpp2IL/Program.cs

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Possible null reference argument for parameter 'gamePath' in 'void Program.HandleMacOSGamePath(string gamePath, string? inputExeName, ref Cpp2IlRuntimeArgs args)'.
else if (Directory.Exists(gamePath) && File.Exists(Path.Combine(gamePath, "GameAssembly.so")))
HandleLinuxGamePath(gamePath, inputExeName, ref args);

Check warning on line 51 in Cpp2IL/Program.cs

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Possible null reference argument for parameter 'gamePath' in 'void Program.HandleLinuxGamePath(string gamePath, string? inputExeName, ref Cpp2IlRuntimeArgs args)'.
else if (Directory.Exists(gamePath))
HandleWindowsGamePath(gamePath, inputExeName, ref args);

Check warning on line 53 in Cpp2IL/Program.cs

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Possible null reference argument for parameter 'gamePath' in 'void Program.HandleWindowsGamePath(string gamePath, string? inputExeName, ref Cpp2IlRuntimeArgs args)'.
else if (File.Exists(gamePath) && Path.GetExtension(gamePath).ToLowerInvariant() == ".apk")
HandleSingleApk(gamePath, ref args);

Check warning on line 55 in Cpp2IL/Program.cs

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Possible null reference argument for parameter 'gamePath' in 'void Program.HandleSingleApk(string gamePath, ref Cpp2IlRuntimeArgs args)'.
else if (File.Exists(gamePath) && Path.GetExtension(gamePath).ToLowerInvariant() is ".xapk" or ".apkm")
HandleXapk(gamePath, ref args);

Check warning on line 57 in Cpp2IL/Program.cs

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Possible null reference argument for parameter 'gamePath' in 'void Program.HandleXapk(string gamePath, ref Cpp2IlRuntimeArgs args)'.
else if (File.Exists(gamePath) && Path.GetExtension(gamePath).ToLowerInvariant() is ".ipa" or ".tipa")
HandleIpa(gamePath, ref args);
else if (File.Exists(gamePath) && Path.GetExtension(gamePath).ToLowerInvariant() == ".json")
HandleWebGL(gamePath, ref args);
else
{
if (!Cpp2IlPluginManager.TryProcessGamePath(gamePath, ref args))
Expand Down Expand Up @@ -487,6 +491,91 @@
args.Valid = true;
}

private static void HandleWebGL(string gamePath, ref Cpp2IlRuntimeArgs args)
{
Logger.VerboseNewline("Trying HandleWebGL as provided path is an json file");

Logger.InfoNewline($"Attempting to extract required file paths from WebGL json config {gamePath}", "WebGL");

var json = File.ReadAllText(gamePath);
var doc = JsonDocument.Parse(json) ?? throw new SoftException("WebGL config is null.");
var frameworkUrl = doc.RootElement.GetProperty("wasmFrameworkUrl").GetString() ?? throw new SoftException("wasmFrameworkUrl is null.");
var codeUrl = doc.RootElement.GetProperty("wasmCodeUrl").GetString() ?? throw new SoftException("wasmCodeUrl is null.");
var dataUrl = doc.RootElement.GetProperty("dataUrl").GetString() ?? throw new SoftException("dataUrl is null.");

var tempFileMeta = Path.GetTempFileName();
PathsToDeleteOnExit.Add(tempFileMeta);

var gameDir = Path.GetDirectoryName(gamePath) ?? "";
args.PathToAssembly = Path.Combine(gameDir, codeUrl);
args.WasmFrameworkJsFile = Path.Combine(gameDir, frameworkUrl);
args.PathToMetadata = tempFileMeta;

var dataBytes = File.ReadAllBytes(Path.Combine(gameDir, dataUrl));
var dataFiles = ParseUnityWebData(dataBytes);

if (dataFiles.TryGetValue("globalgamemanagers", out var globalGameManagers))
{
Logger.InfoNewline("Reading globalgamemanagers to determine unity version...", "WebGL");
var ggmBytes = new byte[0x40];
using var ggmStream = new MemoryStream(globalGameManagers);

// ReSharper disable once MustUseReturnValue
ggmStream.Read(ggmBytes, 0, 0x40);

args.UnityVersion = Cpp2IlApi.GetVersionFromGlobalGameManagers(ggmBytes);
}
else if (dataFiles.TryGetValue("data.unity3d", out var dataUnity3d))
{
Logger.InfoNewline("Reading data.unity3d to determine unity version...", "WebGL");
using var du3dStream = new MemoryStream(dataUnity3d);

args.UnityVersion = Cpp2IlApi.GetVersionFromDataUnity3D(du3dStream);
}
else
throw new SoftException("Could not find globalgamemanagers or unity3d inside UnityWebData.");

if (!dataFiles.TryGetValue("Il2CppData/Metadata/global-metadata.dat", out var globalMetadata))
throw new SoftException("Could not find global-metadata.dat inside UnityWebData.");
File.WriteAllBytes(tempFileMeta, globalMetadata);

Logger.InfoNewline($"Determined game's unity version to be {args.UnityVersion}", "WebGL");

args.Valid = true;
}

private static Dictionary<string, byte[]> ParseUnityWebData(byte[] bytes)
{
const string HEADER = "UnityWebData1.0\0";

var files = new Dictionary<string, byte[]>();
var offset = 0;

var header = Encoding.ASCII.GetString(bytes, offset, HEADER.Length);
if (header != HEADER)
throw new SoftException($"Invalid UnityWebData header \"{header}\".");
offset += HEADER.Length;

var headerEnd = BitConverter.ToUInt32(bytes, offset);
offset += 4;

while (offset < headerEnd)
{
var fileOffset = BitConverter.ToUInt32(bytes, offset); offset += 4;
var fileSize = BitConverter.ToUInt32(bytes, offset); offset += 4;
var filePathLength = BitConverter.ToUInt32(bytes, offset); offset += 4;

var filePath = Encoding.ASCII.GetString(bytes, offset, (int)filePathLength);
offset += (int)filePathLength;

var fileData = new byte[fileSize];
Array.Copy(bytes, fileOffset, fileData, 0, fileData.Length);
files[filePath] = fileData;
}

return files;
}

#if !NETFRAMEWORK
[DynamicDependency(DynamicallyAccessedMemberTypes.All, "Cpp2IL.CommandLineArgs", "Cpp2IL")]
#endif
Expand Down Expand Up @@ -539,7 +628,7 @@
if (options.GamePath != null && options.GamePath.StartsWith("~"))
options.GamePath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + options.GamePath[1..];
#endif

ResolvePathsFromCommandLine(options.GamePath, options.ExeName, ref result);
}
else
Expand Down
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