Stop the crashes at least.

EarthboundBattleBackgrounds/EarthboundBattleBackgrounds/main.cpp

@@ -60,17 +60,17 @@ struct Rom{
 			int32_t bpos2{};
 			while(data[pos]!=0xFF){
 				if(pos>=data.length())throw std::runtime_error{"Unexpected end of data."};
-				char commandType{data[pos]>>5};
-				char length{(data[pos]&0x1F)+1};
+				int commandType{data[pos]>>5};
+				int length{(data[pos]&0x1F)+1};
 				if(commandType==7){
 					commandType=(data[pos]&0x1C)>>2;
-					length=((data[pos]&3)<<8)+(data[pos+1])+1;
+					length=((int(data[pos])&3)<<8)+int(data[pos+1])+1;
 					++pos;
 				}
 				if(bpos+length<0)throw std::runtime_error("Length ended up negative.");
 				pos++;
 				if(commandType>=4){
-					bpos2=(data[pos]<<8)+data[pos+1];
+					bpos2=(int(data[pos])<<8)+int(data[pos+1]);
 					if(bpos2<0)throw std::runtime_error("Reading negative data.");
 					pos+=2;
 				}
@@ -127,17 +127,17 @@ struct Rom{
 			int read{};
 			while(data[pos]!=0xFF){
 				if (pos >= data.length())return;
-				char commandType{data[pos]>>5};
-				char len{data[pos]&0x1F+1};
+				int commandType{data[pos]>>5};
+				int len{data[pos]&0x1F+1};
 				if(commandType==7){
-					commandType=(data[pos]&0x1C)>>2;
-					len=((data[pos]&3)<<8)+data[pos+1]+1;
+					commandType=(int(data[pos])&0x1C)>>2;
+					len=((int(data[pos])&3)<<8)+int(data[pos+1])+1;
 					++pos;
 				}
 				if(bpos+len>maxLength||bpos+len<0)return;
 				++pos;
 				if(commandType>=4) {
-					bpos2=(data[pos]<<8)+data[pos+1];
+					bpos2=(int(data[pos])<<8)+data[pos+1];
 					if(bpos2>=maxLength||bpos2<0)return;
 					pos+=2;
 				}
@@ -336,11 +336,16 @@ public:
 		}
 	}
 
+	void GraphicsDisplayTest(){
+
+	}
+
 	int yOffset{0};
 
 	bool OnUserUpdate(float fElapsedTime) override
 	{
-		PaletteDisplayTest();
+		//PaletteDisplayTest();
+		GraphicsDisplayTest();
 		return true;
 	}
 };