initial commit

include/memory.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+/**
+ * The memory of the Bytepusher. 16 MiB (0x1000008 bytes).
+ * The memory map is located at the beginning of memory and
+ * looks like this:
+ * 
+ * memory (byte) | description
+ * --------------|----------------
+ * 0, 1          | Keyboard state, if key X is
+ *               | pressed then bit X is on
+ *               |
+ * 2, 3, 4       | The program counter starts here
+ *               |
+ * 5             | Graphics block location. A value
+ *               | of ZZ means color of pixel at coordinate (XX, YY)
+ *               | is at ZZYYXX
+ *               |
+ * 6, 7          | Sound block location. A value of XXYY
+ *               | means audio sample ZZ is at address XXYY
+ * -------------------------------
+ * The byte ordering used by Bytepusher is big-endian.
+ */
+
+#include <stdlib.h>
+#include <string>
+class Bus;
+
+class Memory {
+public:
+    Memory(Bus* bus);
+    ~Memory();
+
+    static const size_t MEMORY_SIZE = 0x1000008;
+    uint8_t             mem[MEMORY_SIZE];
+    bool                ROMLoaded;
+    std::string         ROMFilepath;
+    size_t              ROMSize;
+    std::string         ROMLoadError;
+    std::string         snapshotError;
+    std::string         snapshotLast;
+
+
+    void Reset();
+    bool LoadROM(std::string filepath);
+    bool SnapshotRAM(std::string filepath);
+private:
+    Bus* bus;
+};