From bb8ff944398cd79f2d576f25758ea9dd6c35d384 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Thu, 18 Jan 2024 08:30:20 -0800
Subject: iStartek serial interface support

---
 .../org/traccar/protocol/StartekFrameDecoder.java  | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/StartekFrameDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/StartekFrameDecoder.java b/src/main/java/org/traccar/protocol/StartekFrameDecoder.java
new file mode 100644
index 000000000..608b128cd
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/StartekFrameDecoder.java
@@ -0,0 +1,49 @@
+/*
+ * 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.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+import java.nio.charset.StandardCharsets;
+
+public class StartekFrameDecoder extends BaseFrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        if (buf.readableBytes() < 10) {
+            return null;
+        }
+
+        int lengthIndex = buf.readerIndex() + 3;
+        int dividerIndex = buf.indexOf(lengthIndex, buf.writerIndex(), (byte) ',');
+        if (dividerIndex > 0) {
+            int lengthOffset = dividerIndex - buf.readerIndex() + 4;
+            int length = lengthOffset + Integer.parseInt(buf.getCharSequence(
+                    lengthIndex, dividerIndex - lengthIndex, StandardCharsets.US_ASCII).toString());
+            if (buf.readableBytes() >= length) {
+                return buf.readRetainedSlice(length);
+            }
+        }
+
+        return null;
+    }
+
+}
-- 
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