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authorAnton Tananaev <anton@traccar.org>2024-01-27 14:41:05 -0800
committerAnton Tananaev <anton@traccar.org>2024-01-27 14:41:05 -0800
commit34b507dbe268c6aec2f20e9ec3c3f9e243187c3e (patch)
treed19b50eddd491ce866c6deef4c20c20fb575b705 /src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java
parentb098be7f6245dcd2c00cc8457174e9fe7733d3b2 (diff)
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Initial FleetGuide implementation
Diffstat (limited to 'src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java98
1 files changed, 98 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java b/src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java
new file mode 100644
index 000000000..d63187921
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/FleetGuideProtocolDecoder.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2024 Anton Tananaev (anton@traccar.org)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.Protocol;
+import org.traccar.helper.BitUtil;
+import org.traccar.session.DeviceSession;
+
+import java.lang.reflect.Method;
+import java.net.SocketAddress;
+
+public class FleetGuideProtocolDecoder extends BaseProtocolDecoder {
+
+ public FleetGuideProtocolDecoder(Protocol protocol) {
+ super(protocol);
+ }
+
+ public static final int MSG_DATA = 0x10;
+ public static final int MSG_HEARTBEAT = 0x1A;
+ public static final int MSG_RESPONSE = 0x1C;
+
+ @Override
+ protected Object decode(
+ Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+ ByteBuf buf = (ByteBuf) msg;
+
+ buf.readUnsignedByte(); // signature
+ int options = buf.readUnsignedShort();
+ int length = BitUtil.to(options, 11);
+
+ DeviceSession deviceSession;
+ if (BitUtil.check(options, 11)) {
+ deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(buf.readUnsignedInt()));
+ } else {
+ deviceSession = getDeviceSession(channel, remoteAddress);
+ }
+ if (deviceSession == null) {
+ return null;
+ }
+
+ int type;
+ if (BitUtil.check(options, 12)) {
+ type = BitUtil.to(buf.readUnsignedByte(), 4);
+ } else {
+ type = 0;
+ }
+
+ if (BitUtil.check(options, 13)) {
+ buf.readUnsignedShort(); // acknowledgement
+ }
+
+ ByteBuf data;
+ if (BitUtil.check(options, 14)) {
+ data = decompress(buf.readSlice(length));
+ } else {
+ data = buf.readRetainedSlice(length);
+ }
+
+ data.release();
+
+ return null;
+ }
+
+ private ByteBuf decompress(ByteBuf input) throws ReflectiveOperationException {
+
+ Class<?> clazz = Class.forName("io.netty.handler.codec.compression.FastLz");
+ Method method = clazz.getDeclaredMethod(
+ "decompress", ByteBuf.class, int.class, int.class, ByteBuf.class, int.class, int.class);
+
+ ByteBuf output = Unpooled.buffer();
+ int result = (Integer) method.invoke(
+ null, input, input.readerIndex(), input.readableBytes(), output, 0, Integer.MAX_VALUE);
+ if (result <= 0) {
+ throw new IllegalArgumentException("FastLz decompression failed");
+ }
+
+ return output;
+ }
+
+}