/* * Copyright © 2010 Keith Packard * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ package altosui; import java.io.*; public class AltosRomconfig { public boolean valid; public int version; public int check; public int serial_number; public int radio_calibration; static int get_int(byte[] bytes, int start, int len) { int v = 0; int o = 0; while (len > 0) { v = v | ((((int) bytes[start]) & 0xff) << o); start++; len--; o += 8; } return v; } static void put_int(int value, byte[] bytes, int start, int len) { while (len > 0) { bytes[start] = (byte) (value & 0xff); start++; len--; value >>= 8; } } static void put_string(String value, byte[] bytes, int start) { for (int i = 0; i < value.length(); i++) bytes[start + i] = (byte) value.charAt(i); } static final int AO_USB_DESC_STRING = 3; static void put_usb_serial(int value, byte[] bytes, int start) { int offset = start + 0xa; int string_num = 0; while (offset < bytes.length && bytes[offset] != 0) { if (bytes[offset + 1] == AO_USB_DESC_STRING) { ++string_num; if (string_num == 4) break; } offset += ((int) bytes[offset]) & 0xff; } if (offset >= bytes.length || bytes[offset] == 0) return; int len = ((((int) bytes[offset]) & 0xff) - 2) / 2; String fmt = String.format("%%0%dd", len); String s = String.format(fmt, value); if (s.length() != len) { System.out.printf("weird usb length issue %s isn't %d\n", s, len); return; } for (int i = 0; i < len; i++) { bytes[offset + 2 + i*2] = (byte) s.charAt(i); bytes[offset + 2 + i*2+1] = 0; } } public AltosRomconfig(byte[] bytes, int offset) { version = get_int(bytes, offset + 0, 2); check = get_int(bytes, offset + 2, 2); if (check == (~version & 0xffff)) { switch (version) { case 2: case 1: serial_number = get_int(bytes, offset + 4, 2); radio_calibration = get_int(bytes, offset + 6, 4); valid = true; break; } } } public AltosRomconfig(AltosHexfile hexfile) { this(hexfile.data, 0xa0 - hexfile.address); } public void write(byte[] bytes, int offset) throws IOException { if (!valid) throw new IOException("rom configuration invalid"); if (offset < 0 || bytes.length < offset + 10) throw new IOException("image cannot contain rom config"); AltosRomconfig existing = new AltosRomconfig(bytes, offset); if (!existing.valid) throw new IOException("image does not contain existing rom config"); switch (existing.version) { case 2: put_usb_serial(serial_number, bytes, offset); case 1: put_int(serial_number, bytes, offset + 4, 2); put_int(radio_calibration, bytes, offset + 6, 4); break; } } public void write (AltosHexfile hexfile) throws IOException { write(hexfile.data, 0xa0 - hexfile.address); AltosRomconfig check = new AltosRomconfig(hexfile); if (!check.valid()) throw new IOException("writing new rom config failed\n"); } public AltosRomconfig(int in_serial_number, int in_radio_calibration) { valid = true; version = 1; check = (~version & 0xffff); serial_number = in_serial_number; radio_calibration = in_radio_calibration; } public boolean valid() { return valid && serial_number != 0; } public AltosRomconfig() { valid = false; } }