Read IW4 signed headers

src/ZoneLoading/Loading/Processor/ProcessorCaptureData.h

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+#pragma once
+#include <memory>
+
+#include "Loading/StreamProcessor.h"
+#include "Loading/ICapturedDataProvider.h"
+
+class ProcessorCaptureData final : public StreamProcessor, public ICapturedDataProvider
+{
+    std::unique_ptr<uint8_t[]> m_data;
+    const size_t m_capture_size;
+    size_t m_captured_data_size;
+
+public:
+    explicit ProcessorCaptureData(size_t captureSize);
+    ~ProcessorCaptureData() override;
+
+    size_t Load(void* buffer, size_t length) override;
+    int64_t Pos() override;
+    void GetCapturedData(const uint8_t** pCapturedData, size_t* pSize) override;
+};