package android_serialport_api;

import android.util.Log;

import java.io.*;

public class SerialPort {

	private static final String TAG = "SerialPort";
	private FileDescriptor mFd;
	private FileInputStream mFileInputStream;
	private FileOutputStream mFileOutputStream;

	public SerialPort(File device, int baudrate, int bits, char event, int stop, int flags) throws SecurityException,
			IOException {

		if (!device.canRead() || !device.canWrite()) {
			try {
				Process su;
				su = Runtime.getRuntime().exec("/system/bin/su");
				String cmd = "chmod 777 " + device.getAbsolutePath() + "\n" + "exit\n";
				su.getOutputStream().write(cmd.getBytes());

				if ((su.waitFor() != 0) || !device.canRead() || !device.canWrite()) {
					throw new SecurityException();
				}
			} catch (Exception e) {
				e.printStackTrace();
				throw new SecurityException();
			}
		}
		mFd = open(device.getAbsolutePath(), baudrate, bits, event, stop, flags);
		Log.i("info", "open device!!");
		if (mFd == null) {
			Log.e(TAG, "native open returns null");
			throw new IOException();
		}
		mFileInputStream = new FileInputStream(mFd);
		mFileOutputStream = new FileOutputStream(mFd);

	}

	public InputStream getInputStream() {

		return mFileInputStream;
	}

	public OutputStream getOutputStream() {

		return mFileOutputStream;
	}

	private native static FileDescriptor open(String path, int baudrate, int bits, char event, int stop, int flags);

	public native void close();

	static {

		System.loadLibrary("serialport");
	}
}
