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authorAnton Tananaev <anton.tananaev@gmail.com>2021-11-05 16:48:27 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2021-11-05 16:48:27 -0700
commit10a11e03fbb45506973c85ae49d0fd1443d0f9f1 (patch)
treecadcbe287fc14b0c9300b73163938539254fa89e /src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java
parentf8e6bc5ced2244f5f09664e7d778c0bf51cd4ab9 (diff)
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Support new Xexun protocol (fix #4727)
Diffstat (limited to 'src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java69
1 files changed, 69 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java b/src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java
new file mode 100644
index 000000000..521d0209c
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/Xexun2FrameDecoder.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2021 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 io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+import org.traccar.helper.BufferUtil;
+
+public class Xexun2FrameDecoder extends BaseFrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() < 5) {
+ return null;
+ }
+
+ ByteBuf flag = Unpooled.wrappedBuffer(new byte[] {(byte) 0xfa, (byte) 0xaf});
+ int index;
+ try {
+ index = BufferUtil.indexOf(flag, buf, buf.readerIndex() + 2, buf.writerIndex());
+ } finally {
+ flag.release();
+ }
+
+ if (index >= 0) {
+ ByteBuf result = Unpooled.buffer(index + 2 - buf.readerIndex());
+
+ while (buf.readerIndex() < index + 2) {
+ int b = buf.readUnsignedByte();
+ if (b == 0xfb && buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
+ buf.readUnsignedByte(); // skip
+ int ext = buf.readUnsignedByte();
+ if (ext == 0x01) {
+ result.writeByte(0xfa);
+ result.writeByte(0xaf);
+ } else if (ext == 0x02) {
+ result.writeByte(0xfb);
+ result.writeByte(0xbf);
+ }
+ } else {
+ result.writeByte(b);
+ }
+ }
+
+ return result;
+ }
+
+ return null;
+ }
+
+}