public void OpenFile(int iocb, String filename, boolean readOnlyFlag) {
        if (iocb >= 0 && iocb < MAXFILES) {
            if (randomAccessFile[iocb] == null && httpConn[iocb] == null && fc[iocb] == null && socketConn[iocb] == null && inputStream[iocb] == null) {
                Class clazz;
                if (filename.startsWith("file:")) {
                    try {
                        fc[iocb] = (FileConnection) Connector.open(filename);
                        if (readOnlyFlag) {
                            if (!fc[iocb].exists()) {
                                throw new BasicError(4130, "No file: " + filename);
                            }
                        } else {
                            if (fc[iocb].exists()) {
                                fc[iocb].delete();
                                fc[iocb].close();
                                fc[iocb] = (FileConnection) Connector.open(filename);
                            }

                            fc[iocb].create();
                        }

                        dataInput[iocb] = fc[iocb].openDataInputStream();
                        dataOutput[iocb] = fc[iocb].openDataOutputStream();
                    } catch (Exception ex) {
                        clazz = ex.getClass();
                        throw new BasicError(4130, clazz.getName());
                    }
                } else if (filename.startsWith("socket:")) {
                    try {
                        socketConn[iocb] = (SocketConnection) Connector.open(filename);
                        dataOutput[iocb] = socketConn[iocb].openDataOutputStream();
                        dataInput[iocb] = socketConn[iocb].openDataInputStream();
                    } catch (Exception ex) {
                        clazz = ex.getClass();
                        throw new BasicError(4130, clazz.getName());
                    }
                } else if (filename.startsWith("https:")) {
                    try {
                        httpConn[iocb] = (HttpsConnection) Connector.open(filename, 3);
                        if (readOnlyFlag) {
                            httpConn[iocb].setRequestMethod("GET");
                        } else {
                            httpConn[iocb].setRequestMethod("POST");
                            httpConn[iocb].setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                        }
                        baos[iocb] = new ByteArrayOutputStream();
                        dataOutput[iocb] = new DataOutputStream(baos[iocb]);
                        dataInput[iocb] = null;
                    } catch (Exception ex) {
                        clazz = ex.getClass();
                        throw new BasicError(4131, clazz.getName());
                    }
                } else if (filename.startsWith("http:")) {
                    try {
                        httpConn[iocb] = (HttpConnection) Connector.open(filename, 3);
                        if (readOnlyFlag) {
                            httpConn[iocb].setRequestMethod("GET");
                        } else {
                            httpConn[iocb].setRequestMethod("POST");
                            httpConn[iocb].setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                        }

                        //httpConn[iocb].setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLCD-1.1 (Mobile BASIC MIDlet 1.9.1 by kiriman & dzanis)");
                        //httpConn[iocb].setRequestProperty("Content-Language", "en-US");
                        //httpConn[iocb].setRequestProperty("Accept", "text/plain");
                        //httpConn[iocb].setRequestProperty("Content-Type", "text/plain");
                        // httpConn[iocb].setRequestProperty("Connection", "close");
                        baos[iocb] = new ByteArrayOutputStream();
                        dataOutput[iocb] = new DataOutputStream(baos[iocb]);
                        dataInput[iocb] = null;
                    } catch (Exception ex) {
                        clazz = ex.getClass();
                        throw new BasicError(4131, clazz.getName());
                    }
                } else if (filename.startsWith("/")) {
                    try {
                        inputStream[iocb] = getClass().getResourceAsStream(filename);
                        dataInput[iocb] = new DataInputStream(inputStream[iocb]);
                        dataOutput[iocb] = null;
                    } catch (Exception ex) {
                        throw new BasicError(4133, ex.getClass().getName());
                    }
                } else {
                    try {
                        randomAccessFile[iocb] = new RandomAccessFile(filename, readOnlyFlag);
                        dataInput[iocb] = randomAccessFile[iocb];
                        dataOutput[iocb] = randomAccessFile[iocb];
                    } catch (Exception ex) {
                        randomAccessFile[iocb] = null;
                        dataInput[iocb] = null;
                        dataOutput[iocb] = null;
                        throw new BasicError(4132, ex.getClass().getName());
                    }
                }
            } else {
                throw new BasicError(4098, "Channel " + iocb + " already in use");
            }
        } else {
            throw new BasicError(4096, "Invalid channel");
        }
    }