Continue work on png writer.

test/core/TestByteUtils.cpp

@@ -13,6 +13,16 @@ int main()
     auto slice = ByteUtils::getMBitsAtN(byte, 3, 3);
     std::cout << "Slice is " << ByteUtils::toString(slice) << std::endl;
 
+    uint32_t input {12345678};
+    auto byte0 = ByteUtils::getByteN(input, 0);
+    auto byte1 = ByteUtils::getByteN(input, 1);
+    auto byte2 = ByteUtils::getByteN(input, 2);
+    auto byte3 = ByteUtils::getByteN(input, 3);
+
+    std::cout << "Byte0 is " << ByteUtils::toString(byte0) << std::endl;
+    std::cout << "Byte1 is " << ByteUtils::toString(byte1) << std::endl;
+    std::cout << "Byte2 is " << ByteUtils::toString(byte2) << std::endl;
+    std::cout << "Byte3 is " << ByteUtils::toString(byte3) << std::endl;
 
     return 0;
 }

test/image/TestPngWriter.cpp

@@ -1,7 +1,7 @@
 #include "Image.h"
 #include "PngWriter.h"
 
-
+#include "File.h"
 #include "BitStream.h"
 #include "ImagePrimitives.h"
 
@@ -24,5 +24,15 @@ int main()
     writer.setPath("test.png");
     writer.write(image);
 
+    File test_file("test.png");
+    test_file.SetAccessMode(File::AccessMode::Read);
+    test_file.Open(true);
+
+    while(auto byte = test_file.readNextByte())
+    {
+        std::cout << static_cast<unsigned>(*byte) << std::endl;
+    }
+    test_file.Close();
+
     return 0;
 }