Starting to parse the Rom's header

CMakeLists.txt

@@ -75,4 +75,5 @@ add_executable(ComSquare
         sources/Memory/IRectangleMemory.hpp
         sources/DSP/DSP.cpp
         sources/DSP/DSP.hpp
+        sources/Exceptions/InvalidAcction.hpp
 )

sources/Cartridge/Cartridge.cpp

@@ -8,6 +8,7 @@
 #include "Cartridge.hpp"
 #include "../Exceptions/InvalidAddress.hpp"
 #include "../Exceptions/InvalidRom.hpp"
+#include "../Exceptions/InvalidAcction.hpp"
 
 namespace ComSquare::Cartridge
 {
@@ -20,9 +21,10 @@ namespace ComSquare::Cartridge
 			if (!rom)
 				throw InvalidRomException("Could not open the rom file at " + romPath + ". " + strerror(errno));
 			this->_size = size;
-			this->_data = new unsigned char[size];
+			this->_data = new uint8_t[size];
 			std::memset(this->_data, 0, size);
 			fread(this->_data, 1, size, rom);
+			this->_loadHeader();
 		} catch (InvalidRomException &ex) {
 			std::cerr << "Invalid Rom Error: " << ex.what() << std::endl;
 		}
@@ -52,8 +54,28 @@ namespace ComSquare::Cartridge
 
 	void Cartridge::write_internal(uint24_t addr, uint8_t data)
 	{
-		if (addr >= this->_size)
-			throw InvalidAddress("Cartridge write", addr);
-		this->_data[addr] = data;
+		(void)addr;
+		(void)data;
+		throw InvalidAcction("Witting to the ROM is not allowed.");
+	}
+
+	uint32_t Cartridge::_getHeaderAddress()
+	{
+		return 0x81c0;
+	}
+
+	bool Cartridge::_loadHeader()
+	{
+		unsigned headerAddress = this->_getHeaderAddress();
+
+		char name[22];
+		std::memcpy(name, &this->_data[headerAddress], 21);
+		name[21] = '\0';
+		this->header.gameName = std::string(name);
+		ADDMAPPINGMODE(this->_data[headerAddress + 21] & 0x10u ? FastRom : SlowRom);
+		ADDMAPPINGMODE(this->_data[headerAddress + 21] & 0x1u  ? HiRom : LoRom);
+		if (this->_data[headerAddress + 21] & 0x2u || this->_data[headerAddress + 210] & 0x4u)
+			ADDMAPPINGMODE(ExRom);
+		return headerAddress & 0x200u;
 	}
 }

sources/Cartridge/Cartridge.hpp

@@ -12,14 +12,13 @@
 
 namespace ComSquare::Cartridge
 {
+	#define ADDMAPPINGMODE(flag) (this->header.mappingMode = static_cast<MappingMode>(this->header.mappingMode | (flag)))
 	enum MappingMode {
-		LowRom,
-		HiRom,
-		ExLowRom,
-		EwHiRom,
-		SA1Rom, // unimplemented
-		FastLoRom,
-		FastHiRom
+		LoRom = 1u << 0u,
+		HiRom = 1u << 1u,
+		SlowRom = 1u << 2u,
+		FastRom = 1u << 3u,
+		ExRom = 1u << 4u,
 	};
 
 	struct Header
@@ -56,6 +55,12 @@ namespace ComSquare::Cartridge
 		//! @param romPath The path of the rom to get info from.
 		//! @return The size of the rom.
 		static size_t getRomSize(const std::string &romPath);
+		//! @brief Set the public variable header by parsing the header in the ROM.
+		//! @return True if this cartridge has a SCM header, false otherwise.
+		bool _loadHeader();
+		//! @brief Get the address of the header.
+		//! @return The address of this cartridge header.
+		uint32_t _getHeaderAddress();
 	public:
 		//! @brief Load a rom from it's path.
 		explicit Cartridge(const std::string &romPath);

sources/Exceptions/InvalidAcction.hpp

@@ -0,0 +1,22 @@
+//
+// Created by anonymus-raccoon on 1/30/20.
+//
+
+#ifndef COMSQUARE_INVALIDACCTION_HPP
+#define COMSQUARE_INVALIDACCTION_HPP
+
+#include <exception>
+#include <string>
+
+namespace ComSquare
+{
+	//! @brief Exception thrown when someone tries to load an invalid rom.
+	class InvalidAcction : std::exception {
+	private:
+		std::string _msg;
+	public:
+		explicit InvalidAcction(const std::string &msg) : _msg(msg) {}
+		const char *what() const noexcept override { return this->_msg.c_str(); }
+	};
+}
+#endif //COMSQUARE_INVALIDACCTION_HPP