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authorAnton Tananaev <anton.tananaev@gmail.com>2016-01-11 22:32:46 +1300
committerAnton Tananaev <anton.tananaev@gmail.com>2016-01-11 22:32:46 +1300
commita56376ac42ef19cff0a664e518271e491ef737c9 (patch)
treefe0ca9d4e59da098d4d84850a20218e5e594278f /src/org
parent3899a1b71eed65ee42a35f75b9d82d235e8ff4d5 (diff)
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Implement Navis protocol frame decoder
Diffstat (limited to 'src/org')
-rw-r--r--src/org/traccar/protocol/NvsFrameDecoder.java49
-rw-r--r--src/org/traccar/protocol/NvsProtocol.java2
-rw-r--r--src/org/traccar/protocol/NvsProtocolDecoder.java6
3 files changed, 53 insertions, 4 deletions
diff --git a/src/org/traccar/protocol/NvsFrameDecoder.java b/src/org/traccar/protocol/NvsFrameDecoder.java
new file mode 100644
index 000000000..ce62ea867
--- /dev/null
+++ b/src/org/traccar/protocol/NvsFrameDecoder.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class NvsFrameDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() < 4 + 2) {
+ return null;
+ }
+
+ int length;
+ if (buf.getUnsignedByte(buf.readerIndex()) == 0) {
+ length = buf.getUnsignedShort(buf.readerIndex());
+ } else {
+ length = 4 + buf.getUnsignedShort(buf.readerIndex() + 4) + 2;
+ }
+
+ if (buf.readableBytes() >= length) {
+ return buf.readBytes(length);
+ }
+
+ return null;
+ }
+
+}
diff --git a/src/org/traccar/protocol/NvsProtocol.java b/src/org/traccar/protocol/NvsProtocol.java
index fccc58a75..334d53343 100644
--- a/src/org/traccar/protocol/NvsProtocol.java
+++ b/src/org/traccar/protocol/NvsProtocol.java
@@ -34,7 +34,7 @@ public class NvsProtocol extends BaseProtocol {
serverList.add(new TrackerServer(new ServerBootstrap(), this.getName()) {
@Override
protected void addSpecificHandlers(ChannelPipeline pipeline) {
- pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024, 4, 2, 2, 0));
+ pipeline.addLast("frameDecoder", new NvsFrameDecoder());
pipeline.addLast("objectDecoder", new NvsProtocolDecoder(NvsProtocol.this));
}
});
diff --git a/src/org/traccar/protocol/NvsProtocolDecoder.java b/src/org/traccar/protocol/NvsProtocolDecoder.java
index 3656f4be2..5597c8bbb 100644
--- a/src/org/traccar/protocol/NvsProtocolDecoder.java
+++ b/src/org/traccar/protocol/NvsProtocolDecoder.java
@@ -46,10 +46,8 @@ public class NvsProtocolDecoder extends BaseProtocolDecoder {
ChannelBuffer buf = (ChannelBuffer) msg;
- buf.skipBytes(4); // marker
- int length = buf.readUnsignedShort();
- if (length == 15 + 3) {
+ if (buf.getUnsignedByte(buf.readerIndex()) == 0) {
String imei = buf.toString(buf.readerIndex(), 15, Charset.defaultCharset());
@@ -63,6 +61,8 @@ public class NvsProtocolDecoder extends BaseProtocolDecoder {
List<Position> positions = new LinkedList<>();
+ buf.skipBytes(4); // marker
+ buf.readUnsignedShort(); // length
buf.readLong(); // imei
buf.readUnsignedByte(); // codec
int count = buf.readUnsignedByte();