From d21747209c9092e3cd693a872d38b9fac8fb1abc Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Wed, 6 Jan 2021 22:45:48 -0800
Subject: Satellite protocol support

---
 .../java/org/traccar/protocol/AdmFrameDecoder.java | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/main/java/org/traccar/protocol/AdmFrameDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/AdmFrameDecoder.java b/src/main/java/org/traccar/protocol/AdmFrameDecoder.java
new file mode 100644
index 000000000..7ee9b6874
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/AdmFrameDecoder.java
@@ -0,0 +1,47 @@
+/*
+ * 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.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+public class AdmFrameDecoder extends BaseFrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        if (buf.readableBytes() < 15 + 3) {
+            return null;
+        }
+
+        int length;
+        if (Character.isDigit(buf.getUnsignedByte(buf.readerIndex()))) {
+            length = 15 + buf.getUnsignedByte(buf.readerIndex() + 15 + 2);
+        } else {
+            length = buf.getUnsignedByte(buf.readerIndex() + 2);
+        }
+
+        if (buf.readableBytes() >= length) {
+            return buf.readRetainedSlice(length);
+        }
+
+        return null;
+    }
+
+}
-- 
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