Move altoslib sources to top dir

[fw/altos] / altoslib / AltosTelemetryRecord.java

diff --git a/altoslib/AltosTelemetryRecord.java b/altoslib/AltosTelemetryRecord.java
new file mode 100644 (file)
index 0000000..367c148
--- /dev/null
+++ b/altoslib/AltosTelemetryRecord.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.com>
+ *
+ * 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 org.altusmetrum.AltosLib;
+
+public abstract class AltosTelemetryRecord {
+
+       long    received_time;
+       abstract public AltosRecord update_state(AltosRecord previous);
+
+       static boolean cksum(int[] bytes) {
+               int     sum = 0x5a;
+               for (int i = 1; i < bytes.length - 1; i++)
+                       sum += bytes[i];
+               sum &= 0xff;
+               return sum == bytes[bytes.length - 1];
+       }
+
+       final static int PKT_APPEND_STATUS_1_CRC_OK             = (1 << 7);
+       final static int PKT_APPEND_STATUS_1_LQI_MASK           = (0x7f);
+       final static int PKT_APPEND_STATUS_1_LQI_SHIFT          = 0;
+
+       final static int packet_type_TM_sensor = 0x01;
+       final static int packet_type_Tm_sensor = 0x02;
+       final static int packet_type_Tn_sensor = 0x03;
+       final static int packet_type_configuration = 0x04;
+       final static int packet_type_location = 0x05;
+       final static int packet_type_satellite = 0x06;
+       final static int packet_type_companion = 0x07;
+       
+       static AltosTelemetryRecord parse_hex(String hex)  throws ParseException, AltosCRCException {
+               AltosTelemetryRecord    r;
+
+               int[] bytes;
+               try {
+                       bytes = Altos.hexbytes(hex);
+               } catch (NumberFormatException ne) {
+                       throw new ParseException(ne.getMessage(), 0);
+               }
+
+               /* one for length, one for checksum */
+               if (bytes[0] != bytes.length - 2)
+                       throw new ParseException(String.format("invalid length %d != %d\n",
+                                                              bytes[0],
+                                                              bytes.length - 2), 0);
+               if (!cksum(bytes))
+                       throw new ParseException(String.format("invalid line \"%s\"", hex), 0);
+
+               int     rssi = Altos.int8(bytes, bytes.length - 3) / 2 - 74;
+               int     status = Altos.uint8(bytes, bytes.length - 2);
+
+               if ((status & PKT_APPEND_STATUS_1_CRC_OK) == 0)
+                       throw new AltosCRCException(rssi);
+
+               /* length, data ..., rssi, status, checksum -- 4 bytes extra */
+               switch (bytes.length) {
+               case Altos.ao_telemetry_standard_len + 4:
+                       int     type = Altos.uint8(bytes, 4 + 1);
+                       switch (type) {
+                       case packet_type_TM_sensor:
+                       case packet_type_Tm_sensor:
+                       case packet_type_Tn_sensor:
+                               r = new AltosTelemetryRecordSensor(bytes, rssi);
+                               break;
+                       case packet_type_configuration:
+                               r = new AltosTelemetryRecordConfiguration(bytes);
+                               break;
+                       case packet_type_location:
+                               r = new AltosTelemetryRecordLocation(bytes);
+                               break;
+                       case packet_type_satellite:
+                               r = new AltosTelemetryRecordSatellite(bytes);
+                               break;
+                       case packet_type_companion:
+                               r = new AltosTelemetryRecordCompanion(bytes);
+                               break;
+                       default:
+                               r = new AltosTelemetryRecordRaw(bytes);
+                               break;
+                       }
+                       break;
+               case Altos.ao_telemetry_0_9_len + 4:
+                       r = new AltosTelemetryRecordLegacy(bytes, rssi, status);
+                       break;
+               case Altos.ao_telemetry_0_8_len + 4:
+                       r = new AltosTelemetryRecordLegacy(bytes, rssi, status);
+                       break;
+               default:
+                       throw new ParseException(String.format("Invalid packet length %d", bytes.length), 0);
+               }
+               r.received_time = System.currentTimeMillis();
+               return r;
+       }
+
+       public static AltosTelemetryRecord parse(String line) throws ParseException, AltosCRCException {
+               AltosTelemetryRecord    r;
+
+               String[] word = line.split("\\s+");
+               int i =0;
+               if (word[i].equals("CRC") && word[i+1].equals("INVALID")) {
+                       i += 2;
+                       AltosParse.word(word[i++], "RSSI");
+                       throw new AltosCRCException(AltosParse.parse_int(word[i++]));
+               }
+
+               if (word[i].equals("TELEM"))
+                       r = parse_hex(word[i+1]);
+               else
+                       r = new AltosTelemetryRecordLegacy(line);
+               return r;
+       }
+}