feat: Add ProtoDumper for runtime Google.Protobuf schema extraction and decoding

DorkNet.ProtoDumper/DorkNet.ProtoDumper.csproj

@@ -0,0 +1,76 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!--
+    Standalone MelonLoader IL2CPP mod whose ONLY job is to dump every
+    Google.Protobuf FileDescriptor that the running client has loaded.
+
+    It carries no Harmony patches, so it is safe to drop onto ANY Rec Room
+    build (2020, 2023, …) without the version-specific ClientMod patches
+    misfiring. Everything game-side is reached through plain
+    System.Reflection over the Il2CppInterop proxy assemblies, so no game
+    DLLs are referenced at compile time (they would be derivative works).
+
+    Build (desktop net6 MelonLoader, same pin as the ClientMod):
+
+      dotnet build DorkNet.ProtoDumper/DorkNet.ProtoDumper.csproj -c Release
+
+    Drop bin\Release\DorkNet.ProtoDumper.dll into <RecRoom>\Mods\ on a
+    MelonLoader-patched build and launch. Output lands in
+    <RecRoom>\DorkNet-ProtoDump\.
+  -->
+
+  <PropertyGroup>
+    <TargetFramework Condition="'$(TargetFramework)' == ''">net6.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <RootNamespace>DorkNet.ProtoDumper</RootNamespace>
+    <AssemblyName>DorkNet.ProtoDumper</AssemblyName>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <CopyLocalLockFileAssemblies>false</CopyLocalLockFileAssemblies>
+    <NoWarn>$(NoWarn);CS8602;CS8604;CS0436</NoWarn>
+  </PropertyGroup>
+
+  <!-- Reuse the MelonLoader DLLs the ClientMod project already downloads. -->
+  <PropertyGroup>
+    <MelonLoaderVersion Condition="'$(MelonLoaderVersion)' == ''">v0.6.6</MelonLoaderVersion>
+    <MelonLoaderCacheRoot>$(MSBuildThisFileDirectory)..\DorkNet.ClientMod\build\melonloader</MelonLoaderCacheRoot>
+    <MelonLoaderZip>$(MelonLoaderCacheRoot)\MelonLoader.x64.$(MelonLoaderVersion).zip</MelonLoaderZip>
+    <MelonLoaderDir Condition="'$(MelonLoaderDir)' == ''">$(MelonLoaderCacheRoot)\MelonLoader</MelonLoaderDir>
+    <MelonLoaderReferenceTfm Condition="'$(MelonLoaderReferenceTfm)' == '' and '$(TargetFramework)' == 'net8.0'">net8</MelonLoaderReferenceTfm>
+    <MelonLoaderReferenceTfm Condition="'$(MelonLoaderReferenceTfm)' == ''">net6</MelonLoaderReferenceTfm>
+  </PropertyGroup>
+
+  <Target Name="EnsureMelonLoaderReferences"
+          BeforeTargets="ResolveAssemblyReferences"
+          Condition="'$(MelonLoaderReferenceTfm)' == 'net6' and !Exists('$(MelonLoaderDir)\$(MelonLoaderReferenceTfm)\MelonLoader.dll')">
+    <MakeDir Directories="$(MelonLoaderCacheRoot)" />
+    <DownloadFile
+      SourceUrl="https://github.com/LavaGang/MelonLoader/releases/download/$(MelonLoaderVersion)/MelonLoader.x64.zip"
+      DestinationFolder="$(MelonLoaderCacheRoot)"
+      DestinationFileName="MelonLoader.x64.$(MelonLoaderVersion).zip"
+      SkipUnchangedFiles="true" />
+    <Unzip SourceFiles="$(MelonLoaderZip)"
+           DestinationFolder="$(MelonLoaderCacheRoot)"
+           OverwriteReadOnlyFiles="true" />
+  </Target>
+
+  <ItemGroup>
+    <Reference Include="MelonLoader">
+      <HintPath>$(MelonLoaderDir)\$(MelonLoaderReferenceTfm)\MelonLoader.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+    <Reference Include="0Harmony">
+      <HintPath>$(MelonLoaderDir)\$(MelonLoaderReferenceTfm)\0Harmony.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+    <Reference Include="Il2CppInterop.Runtime">
+      <HintPath>$(MelonLoaderDir)\$(MelonLoaderReferenceTfm)\Il2CppInterop.Runtime.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+    <Reference Include="Il2CppInterop.Common">
+      <HintPath>$(MelonLoaderDir)\$(MelonLoaderReferenceTfm)\Il2CppInterop.Common.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+  </ItemGroup>
+
+</Project>

DorkNet.ProtoDumper/ProtoDumper.cs

@@ -0,0 +1,259 @@
+// DorkNet ProtoDumper — runtime Google.Protobuf schema extractor.
+//
+// Rec Room compiles its room-save / creation / circuits data model from
+// .proto files into Google.Protobuf C# classes. In the shipped IL2CPP build
+// those classes are name-obfuscated and the descriptor base64 is split into
+// scattered string-literal chunks, so static reconstruction from
+// global-metadata.dat is unreliable.
+//
+// At RUNTIME every FileDescriptor still carries its original, un-obfuscated
+// FileDescriptorProto (message names, field names, numbers, types intact).
+// The catch: these descriptors are built LAZILY and in a specific dependency
+// order by the game. Force-building them ourselves (by reading a message
+// type's static descriptor property out of order) throws inside the type's
+// static constructor and the failure is cached — poisoning the type. So we do
+// NOT enumerate types. Instead we Harmony-postfix the one library method every
+// generated cctor funnels through — Google.Protobuf.Reflection.FileDescriptor
+// .BuildFrom / .FromGeneratedCode — and capture each descriptor as the game
+// builds it. Completely passive: just play the client through the dorm, a
+// created room, the Maker Pen and a circuits board, and every descriptor that
+// loads is recorded.
+//
+// Output (under <RecRoom>\DorkNet-ProtoDump\):
+//   manifest.tsv          — one "<proto path>\t<base64>" line per file
+//   files\<sanitised>.b64 — same base64, one file each
+//   dump.log              — capture log
+//
+// Decode offline with decode_dump.py (see README.md).
+
+using HarmonyLib;
+using MelonLoader;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Text;
+
+[assembly: MelonInfo(typeof(DorkNet.ProtoDumper.ProtoDumper), "DorkNet ProtoDumper", "2.0.0", "Dork Squad")]
+[assembly: MelonGame(null, null)]
+
+namespace DorkNet.ProtoDumper;
+
+public class ProtoDumper : MelonMod
+{
+    private static MelonLogger.Instance? _log;
+
+    // proto file name -> descriptor base64 (accumulated as the game builds them)
+    private static readonly Dictionary<string, string> Files = new(StringComparer.Ordinal);
+    private static readonly object Gate = new();
+    private static string _outDir = "";
+    private static string _filesDir = "";
+    private static volatile bool _dirty;
+    private int _frame;
+
+    public override void OnInitializeMelon()
+    {
+        _log = LoggerInstance;
+        try
+        {
+            string baseDir = AppDomain.CurrentDomain.BaseDirectory ?? Directory.GetCurrentDirectory();
+            _outDir = Path.Combine(baseDir, "DorkNet-ProtoDump");
+            _filesDir = Path.Combine(_outDir, "files");
+            Directory.CreateDirectory(_filesDir);
+            _log.Msg($"ProtoDumper ready. Output dir: {_outDir}");
+        }
+        catch (Exception e) { _log?.Error($"ProtoDumper init failed: {e}"); }
+
+        InstallHooks();
+    }
+
+    private void InstallHooks()
+    {
+        try
+        {
+            // Google.Protobuf library type — NOT obfuscated (it's the library,
+            // not game code), reached by its original name via every loaded
+            // assembly so we never reference the interop DLL at compile time.
+            Type? fd = ResolveType("Google.Protobuf.Reflection.FileDescriptor");
+            if (fd == null)
+            {
+                _log?.Error("ProtoDumper: FileDescriptor type not found — cannot hook.");
+                return;
+            }
+
+            var postfix = new HarmonyMethod(
+                typeof(ProtoDumper).GetMethod(nameof(Captured_Postfix),
+                    BindingFlags.Public | BindingFlags.Static));
+
+            int patched = 0;
+            // BuildFrom is the lower-level builder every descriptor passes
+            // through; FromGeneratedCode is the generated-code entry point.
+            // Patch both (deduped downstream) so nothing is missed.
+            foreach (string name in new[] { "BuildFrom", "FromGeneratedCode" })
+            {
+                foreach (MethodInfo m in fd.GetMethods(BindingFlags.Public | BindingFlags.Static))
+                {
+                    if (m.Name != name) continue;
+                    try { HarmonyInstance.Patch(m, postfix: postfix); patched++; }
+                    catch (Exception e) { _log?.Warning($"ProtoDumper: patch {name} failed: {e.Message}"); }
+                }
+            }
+            _log?.Msg($"ProtoDumper: installed {patched} descriptor-build hooks. Play through your content; descriptors are captured as they load.");
+        }
+        catch (Exception e) { _log?.Error($"ProtoDumper hook install error: {e}"); }
+    }
+
+    // Resolve a type by its ORIGINAL (game-side) name, accounting for the
+    // Il2Cpp prefix Il2CppInterop puts on the namespace (so
+    // "Google.Protobuf.Reflection.FileDescriptor" ->
+    // "Il2CppGoogle.Protobuf.Reflection.FileDescriptor").
+    private static Type? ResolveType(string name)
+    {
+        foreach (Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
+        {
+            try
+            {
+                var t = asm.GetType(name, false) ?? asm.GetType("Il2Cpp" + name, false);
+                if (t != null) return t;
+                int dot = name.IndexOf('.');
+                if (dot > 0)
+                {
+                    var ns = asm.GetType("Il2Cpp" + name.Substring(0, dot) + name.Substring(dot), false);
+                    if (ns != null) return ns;
+                }
+            }
+            catch { }
+        }
+        return null;
+    }
+
+    // Harmony postfix on FileDescriptor.BuildFrom / FromGeneratedCode.
+    // __result is the freshly-built FileDescriptor (Il2Cpp proxy, boxed as
+    // object — same pattern the ClientMod uses for il2cpp reference returns).
+    public static void Captured_Postfix(object? __result)
+    {
+        if (__result == null) return;
+        try { CollectFile(__result); }
+        catch { /* never let our hook disturb the game */ }
+    }
+
+    private static void CollectFile(object file)
+    {
+        string? name = GetProp(file, "Name") as string;
+        if (string.IsNullOrEmpty(name)) return;
+
+        lock (Gate)
+        {
+            if (Files.ContainsKey(name!)) return;
+
+            string b64 = DescriptorBase64(file);
+            Files[name!] = b64;
+            _dirty = true;
+        }
+
+        // Capture import dependencies too (closure of well-known + leaf protos).
+        try
+        {
+            object? deps = GetProp(file, "Dependencies");
+            if (deps != null)
+            {
+                var dt = deps.GetType();
+                var countP = dt.GetProperty("Count");
+                var itemM = dt.GetMethod("get_Item", new[] { typeof(int) });
+                if (countP != null && itemM != null)
+                {
+                    int n = (int)(countP.GetValue(deps) ?? 0);
+                    for (int i = 0; i < n; i++)
+                    {
+                        object? dep = itemM.Invoke(deps, new object[] { i });
+                        if (dep != null) CollectFile(dep);
+                    }
+                }
+            }
+        }
+        catch { }
+    }
+
+    private static string DescriptorBase64(object file)
+    {
+        try
+        {
+            // FileDescriptor exposes no public SerializedData property — only
+            // the Il2CppInterop backing field (a ByteString with the original
+            // descriptor bytes). Fall back to re-serialising the parsed Proto.
+            object? sd = GetProp(file, "_SerializedData_k__BackingField")
+                         ?? GetProp(file, "SerializedData");
+            if (sd != null)
+            {
+                string b = ByteStringToBase64(sd);
+                if (b.Length > 0) return b;
+            }
+            object? proto = GetProp(file, "Proto");
+            if (proto != null)
+            {
+                MethodInfo? toBs = proto.GetType().GetMethod("ToByteString", Type.EmptyTypes);
+                object? bs = toBs?.Invoke(proto, null);
+                if (bs != null) return ByteStringToBase64(bs);
+            }
+        }
+        catch { }
+        return "";
+    }
+
+    private static string ByteStringToBase64(object byteString)
+    {
+        MethodInfo? toB64 = byteString.GetType().GetMethod("ToBase64", Type.EmptyTypes);
+        return toB64?.Invoke(byteString, null) as string ?? "";
+    }
+
+    private static object? GetProp(object obj, string propName)
+    {
+        var p = obj.GetType().GetProperty(propName,
+            BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
+        return p?.GetValue(obj);
+    }
+
+    public override void OnUpdate()
+    {
+        // Flush to disk shortly after new descriptors are captured (every ~1s).
+        if (++_frame % 60 == 0 && _dirty)
+            Flush();
+    }
+
+    public override void OnApplicationQuit() => Flush();
+
+    private static void Flush()
+    {
+        lock (Gate)
+        {
+            if (!_dirty) return;
+            _dirty = false;
+            try
+            {
+                var sb = new StringBuilder();
+                int withData = 0;
+                foreach (var kv in Files)
+                {
+                    if (kv.Value.Length == 0) continue;
+                    withData++;
+                    sb.Append(kv.Key).Append('\t').Append(kv.Value).Append('\n');
+                    string fp = Path.Combine(_filesDir, Sanitize(kv.Key) + ".b64");
+                    if (!File.Exists(fp)) File.WriteAllText(fp, kv.Value);
+                }
+                File.WriteAllText(Path.Combine(_outDir, "manifest.tsv"), sb.ToString());
+                string line = $"captured files={Files.Count} (with-data={withData})";
+                File.AppendAllText(Path.Combine(_outDir, "dump.log"), line + "\n");
+                _log?.Msg($"ProtoDumper: {line} -> {_outDir}");
+            }
+            catch (Exception e) { _log?.Error($"ProtoDumper flush error: {e}"); }
+        }
+    }
+
+    private static string Sanitize(string protoPath)
+    {
+        var sb = new StringBuilder(protoPath.Length);
+        foreach (char c in protoPath)
+            sb.Append(char.IsLetterOrDigit(c) || c == '_' || c == '-' || c == '.' ? c : '_');
+        return sb.ToString();
+    }
+}

DorkNet.ProtoDumper/README.md

@@ -0,0 +1,81 @@
+# DorkNet ProtoDumper
+
+Runtime extractor for Rec Room's Google.Protobuf schema (room save /
+creation / circuits data model). Produces clean `.proto` files for any
+client build — including obfuscated ones like 2023.03.21 where static
+reconstruction from `global-metadata.dat` is unreliable (the descriptor
+base64 is split into scattered string-literal chunks whose concat order
+only lives in IL).
+
+At runtime every `FileDescriptor` still carries its original,
+un-obfuscated `FileDescriptorProto` (real message names, field names,
+numbers and types intact). The catch: Rec Room builds these descriptors
+**lazily and in a specific dependency order** as content loads. Trying to
+force-build them by reading a message type's static descriptor out of
+order throws inside the type's static constructor, and the failure is
+cached — *poisoning* the type (and crashing the client). So this mod does
+**not** enumerate types.
+
+Instead it Harmony-postfixes the one library method every generated cctor
+funnels through —
+`Google.Protobuf.Reflection.FileDescriptor.BuildFrom` /
+`.FromGeneratedCode` — and records each descriptor as the game builds it.
+Completely passive: **play the client through the content you care about**
+and every descriptor that loads is captured.
+
+## Pipeline
+
+1. **Build the mod**
+
+   ```sh
+   dotnet build DorkNet.ProtoDumper/DorkNet.ProtoDumper.csproj -c Release
+   ```
+
+   Output: `DorkNet.ProtoDumper/bin/Release/DorkNet.ProtoDumper.dll`.
+
+2. **Run it on a *runnable* 2023.03.21 client (MelonLoader 0.6.6)**
+
+   > The `GameAssembly.dll` + `il2cpp_data`-only copy under
+   > `Recnet-old/dist/RecRoom-2023.03.21-il2cpp/…/staging/` is an
+   > **offline-analysis payload, not a runnable build**. Use a full build
+   > with the exe + UnityPlayer + MelonLoader (e.g. the devdork package).
+
+   - Drop `DorkNet.ProtoDumper.dll` into `<RecRoom>\Mods\`. On launch it
+     installs the descriptor-build hooks (see `dump.log` / MelonLoader
+     console for "installed N descriptor-build hooks").
+   - **Log in and play through the content whose schema you want:** your
+     dorm, a created room, the Maker Pen, and a circuits (CV2) board. Each
+     subsystem builds its protos the first time it loads. Descriptors are
+     captured the instant they build — no scene/timer scanning, nothing is
+     force-built, so the client stays stable.
+   - Output appears under `<RecRoom>\DorkNet-ProtoDump\` and is flushed to
+     disk ~1 s after new descriptors load, and again on quit:
+     - `manifest.tsv`   — `<proto path>\t<base64>` per file
+     - `files\*.b64`    — same, one file each
+     - `dump.log`       — running capture count
+
+3. **Decode to .proto**
+
+   ```sh
+   pip install protobuf
+   python DorkNet.ProtoDumper/decode_dump.py <path>/manifest.tsv proto_out
+   ```
+
+   Emits one `.proto` per descriptor under `proto_out/`, plus a combined
+   `proto_out/recroom_2023.proto` (every rec_room/circuits message in one
+   file) for an easy diff against
+   `DorkNet.Server/Protos/recroom_2020.proto`.
+
+## Notes
+
+- No game DLLs are referenced at compile time. `FileDescriptor` is the
+  Google.Protobuf *library* type (not obfuscated); it's reached by its
+  original name with the Il2Cpp namespace-prefix fallback, and its members
+  are read via reflection. The same DLL works across builds and stays clean
+  of derivative game code.
+- The only Harmony patches are the two read-only descriptor-build
+  postfixes above — safe to run alongside (or without) `DorkNet.ClientMod`.
+- The descriptor base64 is the same `FileDescriptorProto` wire format
+  Google's own tooling emits, so `decode_dump.py` (or `protoc
+  --decode=google.protobuf.FileDescriptorProto descriptor.proto`) reads it
+  directly.

DorkNet.ProtoDumper/decode_dump.py

@@ -0,0 +1,165 @@
+#!/usr/bin/env python3
+"""Decode a DorkNet ProtoDumper manifest into .proto text.
+
+Usage:
+    python decode_dump.py manifest.tsv  [out_dir]
+
+manifest.tsv has one  "<proto path>\\t<base64 FileDescriptorProto>"  line per
+file (as written by the ProtoDumper MelonLoader mod). This emits one .proto
+file per descriptor under out_dir/ (default: ./proto_out), plus a combined
+recroom_2023.proto with every rec_room/circuits message in one file for an
+easy diff against DorkNet.Server/Protos/recroom_2020.proto.
+
+Requires:  pip install protobuf
+"""
+import sys, os, base64, re
+from google.protobuf import descriptor_pb2 as D
+
+FDP = D.FileDescriptorProto
+
+# proto3 scalar type names keyed by FieldDescriptorProto.Type
+SCALAR = {
+    1: "double", 2: "float", 3: "int64", 4: "uint64", 5: "int32",
+    6: "fixed64", 7: "fixed32", 8: "bool", 9: "string", 12: "bytes",
+    13: "uint32", 15: "sfixed32", 16: "sfixed64", 17: "sint32", 18: "sint64",
+}
+LABEL_REPEATED = 3
+
+
+def type_name(f):
+    if f.type in (11, 14):  # message / enum -> use type_name (strip leading dot)
+        return f.type_name.lstrip(".")
+    return SCALAR.get(f.type, f"type{f.type}")
+
+
+def emit_enum(e, indent):
+    pad = "  " * indent
+    out = [f"{pad}enum {e.name} {{"]
+    for v in e.value:
+        out.append(f"{pad}  {v.name} = {v.number};")
+    out.append(f"{pad}}}")
+    return out
+
+
+def emit_message(m, indent=0):
+    pad = "  " * indent
+    out = [f"{pad}message {m.name} {{"]
+
+    # map<> detection: synthetic nested *Entry types with map_entry option
+    map_entries = {}
+    for nt in m.nested_type:
+        if nt.options.map_entry:
+            kt = type_name(nt.field[0])
+            vt = type_name(nt.field[1])
+            map_entries[nt.name] = (kt, vt)
+
+    # which oneofs are real (not proto3 optional synthetic)
+    for nt in m.nested_type:
+        if nt.name in map_entries:
+            continue
+        out += emit_message(nt, indent + 1)
+    for en in m.enum_type:
+        out += emit_enum(en, indent + 1)
+
+    # group fields by oneof
+    printed_oneof = set()
+    for f in m.field:
+        # map field?
+        if f.type == 11 and f.type_name.split(".")[-1] in map_entries:
+            kt, vt = map_entries[f.type_name.split(".")[-1]]
+            out.append(f"{pad}  map<{kt}, {vt}> {f.name} = {f.number};")
+            continue
+
+        if f.HasField("oneof_index") and not f.proto3_optional:
+            idx = f.oneof_index
+            if idx not in printed_oneof:
+                printed_oneof.add(idx)
+                out.append(f"{pad}  oneof {m.oneof_decl[idx].name} {{")
+                for g in m.field:
+                    if g.HasField("oneof_index") and g.oneof_index == idx and not g.proto3_optional:
+                        out.append(f"{pad}    {type_name(g)} {g.name} = {g.number};")
+                out.append(f"{pad}  }}")
+            continue
+
+        label = "repeated " if f.label == LABEL_REPEATED else ""
+        opt = "optional " if f.proto3_optional else ""
+        out.append(f"{pad}  {label}{opt}{type_name(f)} {f.name} = {f.number};")
+
+    out.append(f"{pad}}}")
+    return out
+
+
+def render_file(fdp):
+    out = []
+    syntax = fdp.syntax or "proto2"
+    out.append(f'syntax = "{syntax}";')
+    out.append("")
+    if fdp.package:
+        out.append(f"package {fdp.package};")
+    for dep in fdp.dependency:
+        out.append(f'import "{dep}";')
+    if fdp.package or fdp.dependency:
+        out.append("")
+    for en in fdp.enum_type:
+        out += emit_enum(en, 0)
+        out.append("")
+    for m in fdp.message_type:
+        out += emit_message(m, 0)
+        out.append("")
+    return "\n".join(out).rstrip() + "\n"
+
+
+def main():
+    if len(sys.argv) < 2:
+        print(__doc__); sys.exit(1)
+    manifest = sys.argv[1]
+    out_dir = sys.argv[2] if len(sys.argv) > 2 else "proto_out"
+    os.makedirs(out_dir, exist_ok=True)
+
+    files = []
+    with open(manifest, "r", encoding="utf-8") as fh:
+        for ln in fh:
+            ln = ln.rstrip("\n")
+            if not ln or "\t" not in ln:
+                continue
+            name, b64 = ln.split("\t", 1)
+            try:
+                raw = base64.b64decode(b64)
+                fdp = FDP(); fdp.ParseFromString(raw)
+            except Exception as e:
+                print(f"  ! failed to parse {name}: {e}")
+                continue
+            files.append((name, fdp))
+
+    print(f"parsed {len(files)} descriptors")
+
+    # per-file .proto
+    for name, fdp in files:
+        safe = re.sub(r"[^A-Za-z0-9_.\-]", "_", name)
+        with open(os.path.join(out_dir, safe), "w", encoding="utf-8") as w:
+            w.write(render_file(fdp))
+
+    # combined rec_room/circuits view (skip google/* well-known imports)
+    rr = [ (n,f) for n,f in files if not n.startswith("google/") ]
+    seen = set(); combo = ['syntax = "proto3";', "", "package recroom;", ""]
+    total_msgs = 0
+    for name, fdp in sorted(rr, key=lambda x: x[0]):
+        combo.append(f"// ===== {name}  (package {fdp.package or '-'}) =====")
+        for m in fdp.message_type:
+            if m.name in seen:
+                continue
+            seen.add(m.name)
+            combo += emit_message(m, 0)
+            combo.append("")
+            total_msgs += 1
+        for en in fdp.enum_type:
+            combo += emit_enum(en, 0)
+            combo.append("")
+    with open(os.path.join(out_dir, "recroom_2023.proto"), "w", encoding="utf-8") as w:
+        w.write("\n".join(combo).rstrip() + "\n")
+    print(f"wrote {out_dir}/recroom_2023.proto with {total_msgs} unique messages "
+          f"from {len(rr)} rec_room/circuits descriptors")
+
+
+if __name__ == "__main__":
+    main()