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authorAnton Tananaev <anton.tananaev@gmail.com>2014-08-27 22:12:39 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2014-08-27 22:12:39 +1200
commit2ba8c5218542ff71ff4087ddaefffa0fb572024d (patch)
treed8f1c605bdc6ba863d16f2444862691fbbc3c43c /src/org/traccar/protocol/OrionFrameDecoder.java
parent6522fd1027e086c2708757792f2c8e44d4597908 (diff)
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Start Orion implementation
Diffstat (limited to 'src/org/traccar/protocol/OrionFrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/OrionFrameDecoder.java52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/OrionFrameDecoder.java b/src/org/traccar/protocol/OrionFrameDecoder.java
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+/*
+ * Copyright 2014 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 OrionFrameDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ // Check minimum length
+ if (buf.readableBytes() < 5) {
+ return null;
+ }
+
+ int length = 2 + 2; // head and tail
+
+ if (buf.getByte(buf.readerIndex()) == 0x78) {
+ length += 1 + buf.getByte(buf.readerIndex() + 2);
+ } else {
+ length += 2 + buf.getShort(buf.readerIndex() + 2);
+ }
+
+ // Check length and return buffer
+ if (buf.readableBytes() >= length) {
+ return buf.readBytes(length);
+ }
+
+ return null;
+ }
+
+}