/*
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* Copyright 2009 Cedric Priscal
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android_serialport_api;
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import android.util.Log;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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public class SerialPort {
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private static final String TAG = "SerialPort";
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/*
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* Do not remove or rename the field mFd: it is used by native method close();
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*/
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private FileDescriptor mFd;
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private FileInputStream mFileInputStream;
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private FileOutputStream mFileOutputStream;
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public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {
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/* Check access permission */
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if (!device.canRead() || !device.canWrite()) {
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try {
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/* Missing read/write permission, trying to chmod the file */
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Process su;
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su = Runtime.getRuntime().exec("/system/bin/su");
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String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
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+ "exit\n";
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su.getOutputStream().write(cmd.getBytes());
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if ((su.waitFor() != 0) || !device.canRead()
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|| !device.canWrite()) {
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throw new SecurityException();
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}
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} catch (Exception e) {
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e.printStackTrace();
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throw new SecurityException();
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}
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}
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mFd = open(device.getAbsolutePath(), baudrate, flags);
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if (mFd == null) {
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Log.e(TAG, "native open returns null");
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throw new IOException();
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}
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mFileInputStream = new FileInputStream(mFd);
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mFileOutputStream = new FileOutputStream(mFd);
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}
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// Getters and setters
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public InputStream getInputStream() {
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return mFileInputStream;
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}
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public OutputStream getOutputStream() {
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return mFileOutputStream;
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}
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// JNI
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private native static FileDescriptor open(String path, int baudrate, int flags);
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public native void close();
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static {
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System.loadLibrary("serial_port");
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}
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}
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