Further compression and png work.

src/core/streams/InputBitStream.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "BitStream.h"
+
+#include <istream>
+
+class InputBitStream : public BitStream
+{
+    InputBitStream(std::basic_istream<unsigned 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_istream<unsigned char>* mStream{nullptr};
+};