From f8b0bb61df4865b2bac1f0fe98988c8db207422f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Fri, 20 Jan 2023 17:30:13 -0800
Subject: Extend GalileoSky support

---
 .../traccar/protocol/GalileoProtocolDecoder.java   | 48 +++++++++++++++++++++-
 1 file changed, 46 insertions(+), 2 deletions(-)

(limited to 'src/main/java/org/traccar/protocol/GalileoProtocolDecoder.java')

diff --git a/src/main/java/org/traccar/protocol/GalileoProtocolDecoder.java b/src/main/java/org/traccar/protocol/GalileoProtocolDecoder.java
index fc8a49cf5..b5c6f77ef 100644
--- a/src/main/java/org/traccar/protocol/GalileoProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/GalileoProtocolDecoder.java
@@ -23,6 +23,7 @@ import org.traccar.BaseProtocolDecoder;
 import org.traccar.NetworkMessage;
 import org.traccar.Protocol;
 import org.traccar.helper.BitBuffer;
+import org.traccar.helper.BitUtil;
 import org.traccar.helper.UnitsConverter;
 import org.traccar.model.Position;
 import org.traccar.session.DeviceSession;
@@ -66,7 +67,7 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
         };
         int[] l3 = {
             0x63, 0x64, 0x6f, 0x5d, 0x65, 0x66, 0x67, 0x68,
-            0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e
+            0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0xfa
         };
         int[] l4 = {
             0x20, 0x33, 0x44, 0x90, 0xc0, 0xc2, 0xc3, 0xd3,
@@ -88,6 +89,8 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
         }
         TAG_LENGTH_MAP.put(0x5b, 7); // variable length
         TAG_LENGTH_MAP.put(0x5c, 68);
+        TAG_LENGTH_MAP.put(0xfd, 8);
+        TAG_LENGTH_MAP.put(0xfe, 8);
     }
 
     private static int getTagLength(int tag) {
@@ -239,6 +242,8 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
             }
         } else if (header == 0x07) {
             return decodePhoto(channel, remoteAddress, buf);
+        } else if (header == 0x08) {
+            return decodeCompressedPositions(channel, remoteAddress, buf);
         }
 
         return null;
@@ -259,7 +264,7 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
 
         position.setValid(bits.readUnsigned(1) == 0);
         position.setLongitude(360 * bits.readUnsigned(22) / 4194304.0 - 180);
-        position.setLatitude(360 * bits.readUnsigned(21) / 2097152.0 - 90);
+        position.setLatitude(180 * bits.readUnsigned(21) / 2097152.0 - 90);
         if (bits.readUnsigned(1) > 0) {
             position.set(Position.KEY_ALARM, Position.ALARM_GENERAL);
         }
@@ -392,4 +397,43 @@ public class GalileoProtocolDecoder extends BaseProtocolDecoder {
         return position;
     }
 
+    private List<Position> decodeCompressedPositions(Channel channel, SocketAddress remoteAddress, ByteBuf buf) {
+
+        buf.readUnsignedShortLE(); // length
+
+        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
+        if (deviceSession == null) {
+            return null;
+        }
+
+        List<Position> positions = new LinkedList<>();
+        while (buf.readableBytes() > 2) {
+
+            Position position = new Position(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            decodeMinimalDataSet(position, buf);
+
+            int[] tags = new int[BitUtil.to(buf.readUnsignedByte(), 8)];
+            for (int i = 0; i < tags.length; i++) {
+                tags[i] = buf.readUnsignedByte();
+            }
+
+            for (int tag : tags) {
+                decodeTag(position, buf, tag);
+            }
+
+            positions.add(position);
+
+        }
+
+        sendResponse(channel, 0x02, buf.readUnsignedShortLE());
+
+        for (Position p : positions) {
+            p.setDeviceId(deviceSession.getDeviceId());
+        }
+
+        return positions.isEmpty() ? null : positions;
+    }
+
 }
-- 
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