Further compression and png work.

src/core/streams/InputBitStream.cpp

@@ -0,0 +1,35 @@
+#include "InputBitStream.h"
+
+InputBitStream::InputBitStream(std::basic_istream<unsigned char>* stream)
+    : BitStream(),
+      mStream(stream)
+{
+
+}
+
+bool InputBitStream::isFinished() const
+{
+    return mStream->good();
+}
+
+std::vector<unsigned char> InputBitStream::peekNextNBytes(unsigned n) const
+{
+    return {};
+}
+
+std::optional<unsigned char> InputBitStream::readNextByte()
+{
+    if (mStream->good())
+    {
+        return mStream->get();
+    }
+    else
+    {
+        return std::nullopt;
+    }
+}
+
+void InputBitStream::writeByte(unsigned char data)
+{
+
+}