Further compression and png work.

src/core/streams/OutputBitStream.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "BitStream.h"
+
+#include <ostream>
+
+class OutputBitStream : public BitStream
+{
+public:
+    OutputBitStream(std::basic_ostream<char>* stream);
+
+    bool isFinished() const override;
+
+    std::vector<unsigned char> peekNextNBytes(unsigned n) const override;
+
+    std::optional<unsigned char> readNextByte() override;
+
+    void writeByte(unsigned char data) override;
+
+private:
+    std::basic_ostream<char>* mStream{nullptr};
+};