Further compression and png work.

test/core/TestBitStream.cpp

@@ -0,0 +1,30 @@
+#include "ByteUtils.h"
+#include "BufferBitStream.h"
+
+#include <iostream>
+
+int main()
+{
+    std::vector<std::string> bytes{"11100101", "00110101", "00010001"};
+
+    BufferBitStream stream;
+    for(const auto& byte : bytes)
+    {
+        stream.writeByte(ByteUtils::getFromString(byte));
+    }
+
+    unsigned char buffer{0} ;
+    auto valid = stream.readNextNBits(3, buffer);
+    std::cout << "Slice0 is " << ByteUtils::toString(buffer) << std::endl;
+
+    valid = stream.readNextNBits(3, buffer);
+    std::cout << "Slice1 is " << ByteUtils::toString(buffer) << std::endl;
+
+    valid = stream.readNextNBits(5, buffer);
+    std::cout << "Slice2 is " << ByteUtils::toString(buffer) << std::endl;
+
+    valid = stream.readNextNBits(7, buffer);
+    std::cout << "Slice3 is " << ByteUtils::toString(buffer) << std::endl;
+
+    return 0;
+}