Add Telic custom frame decoder

1 files changed, 54 insertions, 0 deletions

diff --git a/src/org/traccar/protocol/TelicFrameDecoder.java b/src/org/traccar/protocol/TelicFrameDecoder.java
new file mode 100644
index 000000000..2a6e121cf
--- /dev/null
+++ b/src/org/traccar/protocol/TelicFrameDecoder.java
@@ -0,0 +1,54 @@
+/*
+ * 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 TelicFrameDecoder extends FrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() < 4) {
+            return null;
+        }
+
+        long length = buf.getUnsignedInt(buf.readerIndex());
+
+        if (length < 1024) {
+            if (buf.readableBytes() >= length + 4) {
+                buf.readUnsignedInt();
+                return buf.readBytes((int) length);
+            }
+        } else {
+            int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
+            if (endIndex >= 0) {
+                ChannelBuffer frame = buf.readBytes(endIndex - buf.readerIndex());
+                buf.readByte();
+                if (frame.readableBytes() > 0) {
+                    return frame;
+                }
+            }
+        }
+
+        return null;
+    }
+
+}