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-rw-r--r--src/org/traccar/protocol/Pt502FrameDecoder.java62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/Pt502FrameDecoder.java b/src/org/traccar/protocol/Pt502FrameDecoder.java
new file mode 100644
index 000000000..58409ecbf
--- /dev/null
+++ b/src/org/traccar/protocol/Pt502FrameDecoder.java
@@ -0,0 +1,62 @@
+/*
+ * 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;
+import org.traccar.helper.ChannelBufferTools;
+
+public class Pt502FrameDecoder extends FrameDecoder {
+
+ private static final int BINARY_HEADER = 5;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx,
+ Channel channel,
+ ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() < BINARY_HEADER) {
+ return null;
+ }
+
+ if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf && buf.getUnsignedByte(buf.readerIndex() + 1) == 0xfb) {
+
+ int length = buf.getShort(buf.readerIndex() + 3);
+ if (buf.readableBytes() >= length) {
+ buf.skipBytes(BINARY_HEADER);
+ ChannelBuffer result = buf.readBytes(length - BINARY_HEADER - 2);
+ buf.skipBytes(2);
+ return result;
+ }
+
+ } else {
+
+ Integer index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), "\n");
+ if (index != null) {
+ ChannelBuffer result = buf.readBytes(index - 1);
+ buf.skipBytes(2);
+ return result;
+ }
+
+ }
+
+ return null;
+ }
+
+}