Cartridge.java

import java.awt.*;
import java.io.*;

public final class Cartridge {
  private File romFile;
  private FileInputStream fileStream;
  private FileDialog openDialog;
  private String fileName, fullPath;
  public byte[] romData;
  public int romSize, numPages;
  private boolean romLoaded;

  public Cartridge() {
  	romLoaded = false;
  }

  public void showOpenDialog(Frame parent) {
    openDialog = new FileDialog(parent, "Abrir ROM", FileDialog.LOAD);
    openDialog.setDirectory("./");
    openDialog.setFile("*.sms;*.gg");
    openDialog.show();

    fileName = openDialog.getFile();
    
    if(fileName != null && fileName.trim().length() != 0) {
      fullPath = openDialog.getDirectory() + fileName;

      try {
        System.out.println("CARTRIDGE: Loading rom " + fileName.toUpperCase() + "... ");
        romFile = new File(fullPath);
        fileStream = new FileInputStream(romFile);
        romSize = (int)romFile.length();
        if(romSize % 4096 != 0) { // Header detected. Skip it.
          System.out.print("CARTRIDGE: ROM Header Found. Skipping it... ");
          romSize -= 512;
          romData = new byte[romSize];
          numPages = romSize / 16384;
          try { fileStream.skip(512); System.out.println("OK"); }
          catch(IOException e) { System.err.println("CRITICAL I/O ERROR: file error"); System.exit(1); }
        }
        else {                     
          System.out.println("CARTRIDGE: ROM Header not found");
          romData = new byte[romSize];
          numPages = romSize / 16384;
        }

        try {
          fileStream.read(romData);
          romLoaded = true;
          System.out.println("CARTRIDGE: Successfully loaded " + Integer.toString(romSize) + " bytes.");
        }
        catch(IOException e) { System.err.println("CRITICAL I/O ERROR: File cannot be loaded!"); System.exit(1); }
      }
      catch(FileNotFoundException e) {
        fileName = null;
        fullPath = null;
        romLoaded = false;
        System.err.println("CARTRIDGE ERROR: File not found.");
      }
    }
    else {
      romLoaded = false;
    }

    try { fileStream.close(); }
    catch(Exception e) {}
    fileStream = null;
    openDialog = null;
  }

  public String getFileName() {
    return fileName;
  }

  public String getFullPath() {
    return fullPath;
  }

  public int getRomSize() {
    return romSize;
  }

  public boolean isLoaded() {
    return romLoaded;
  }
  
  public void unload() {
  	romLoaded = false;
  }
}