read cartridges

2 files changed, 41 insertions, 0 deletions

diff --git a/src/nes/util/CMakeLists.txt b/src/nes/util/CMakeLists.txt
index c2255dd..1d30125 100644
--- a/src/nes/util/CMakeLists.txt
+++ b/src/nes/util/CMakeLists.txt
@@ -1,4 +1,5 @@
 target_sources(
     nes
     PRIVATE
+        address.hh
         rgb.hh)
\ No newline at end of file
diff --git a/src/nes/util/address.hh b/src/nes/util/address.hh
new file mode 100644
index 0000000..f02b66b
--- /dev/null
+++ b/src/nes/util/address.hh
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <cstdint>
+
+namespace nes
+{
+	/// An address on the NES.
+	class address
+	{
+		std::uint16_t absolute_{ 0 };
+
+	public:
+		/// Create a zero address.
+		explicit address() = default;
+
+		/// Create an address from its absolute value.
+		explicit address(std::uint16_t const absolute)
+			: absolute_{ absolute }
+		{
+		}
+
+		/// Get the absolute address value.
+		auto get_absolute() const -> std::uint16_t
+		{
+			return absolute_;
+		}
+
+		/// Get the address page (the first 8 bits).
+		auto get_page() const -> std::uint8_t
+		{
+			return static_cast<std::uint8_t>((get_absolute() & 0xFF00) >> 8);
+		}
+
+		/// Get the offset within the page (the last 8 bits).
+		auto get_offset() const -> std::uint8_t
+		{
+			return static_cast<std::uint8_t>((get_absolute() & 0x00FF) >> 0);
+		}
+	};
+} // namespace nes
\ No newline at end of file