1 files changed, 58 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/XexunFrameDecoder.java b/src/main/java/org/traccar/protocol/XexunFrameDecoder.java
new file mode 100644
index 000000000..114e94061
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/XexunFrameDecoder.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012 - 2018 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 org.traccar.BaseFrameDecoder;
+import org.traccar.helper.BufferUtil;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+
+public class XexunFrameDecoder extends BaseFrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        if (buf.readableBytes() < 80) {
+            return null;
+        }
+
+        int beginIndex = BufferUtil.indexOf("GPRMC", buf);
+        if (beginIndex == -1) {
+            beginIndex = BufferUtil.indexOf("GNRMC", buf);
+            if (beginIndex == -1) {
+                return null;
+            }
+        }
+
+        int identifierIndex = BufferUtil.indexOf("imei:", buf, beginIndex, buf.writerIndex());
+        if (identifierIndex == -1) {
+            return null;
+        }
+
+        int endIndex = buf.indexOf(identifierIndex, buf.writerIndex(), (byte) ',');
+        if (endIndex == -1) {
+            return null;
+        }
+
+        buf.skipBytes(beginIndex - buf.readerIndex());
+
+        return buf.readRetainedSlice(endIndex - beginIndex + 1);
+    }
+
+}