Fix IW4 fastfile writer factory steps

src/ZoneWriting/Game/IW4/ZoneWriterFactoryIW4.cpp

@@ -8,7 +8,9 @@
 #include "Game/IW4/ZoneConstantsIW4.h"
 #include "Writing/Processor/OutputProcessorDeflate.h"
 #include "Writing/Steps/StepAddOutputProcessor.h"
+#include "Writing/Steps/StepWriteTimestamp.h"
 #include "Writing/Steps/StepWriteXBlockSizes.h"
+#include "Writing/Steps/StepWriteZero.h"
 #include "Writing/Steps/StepWriteZoneContentToFile.h"
 #include "Writing/Steps/StepWriteZoneContentToMemory.h"
 #include "Writing/Steps/StepWriteZoneHeader.h"
@@ -78,6 +80,12 @@ public:
         // Write zone header
         m_writer->AddWritingStep(std::make_unique<StepWriteZoneHeader>(CreateHeaderForParams(isSecure, false)));
 
+        // Write dummy byte that the game ignores as well. No clue what it means.
+        m_writer->AddWritingStep(std::make_unique<StepWriteZero>(1));
+
+        // Write timestamp
+        m_writer->AddWritingStep(std::make_unique<StepWriteTimestamp>());
+
         m_writer->AddWritingStep(std::make_unique<StepAddOutputProcessor>(std::make_unique<OutputProcessorDeflate>()));
 
         // Start of the XFile struct

src/ZoneWriting/Writing/Steps/StepWriteTimestamp.cpp

@@ -0,0 +1,15 @@
+#include "StepWriteTimestamp.h"
+
+#include <algorithm>
+#include <ctime>
+
+StepWriteTimestamp::StepWriteTimestamp()
+{
+}
+
+void StepWriteTimestamp::PerformStep(ZoneWriter* zoneWriter, IWritingStream* stream)
+{
+    // time_t is not guaranteed to be 64bit so cast is necessary
+    const auto time = static_cast<int64_t>(std::time(nullptr));
+    stream->Write(&time, sizeof(time));
+}

src/ZoneWriting/Writing/Steps/StepWriteTimestamp.h

@@ -0,0 +1,10 @@
+#pragma once
+#include "Writing/IWritingStep.h"
+
+class StepWriteTimestamp final : public IWritingStep
+{
+public:
+    StepWriteTimestamp();
+
+    void PerformStep(ZoneWriter* zoneWriter, IWritingStream* stream) override;
+};