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authorAnton Tananaev <anton.tananaev@gmail.com>2017-11-27 04:35:57 +1300
committerAnton Tananaev <anton.tananaev@gmail.com>2017-11-27 04:35:57 +1300
commitcef10080c6012f42823d616b55c6b24215cd9253 (patch)
tree6a6c6df2afc01e1906d2347200d39a5a921bb7cf /src/org/traccar/protocol/TmgFrameDecoder.java
parenta8454d0449cbd36cb02676fd750b64e7ca19a183 (diff)
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Extend TMG to support BD312 protocol
Diffstat (limited to 'src/org/traccar/protocol/TmgFrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/TmgFrameDecoder.java67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/TmgFrameDecoder.java b/src/org/traccar/protocol/TmgFrameDecoder.java
new file mode 100644
index 000000000..07b4162db
--- /dev/null
+++ b/src/org/traccar/protocol/TmgFrameDecoder.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2017 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBufferIndexFinder;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class TmgFrameDecoder extends FrameDecoder {
+
+ private boolean isLetter(byte c) {
+ return c >= 'a' && c <= 'z';
+ }
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+ int beginIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new ChannelBufferIndexFinder() {
+ @Override
+ public boolean find(ChannelBuffer buffer, int guessedIndex) {
+ if (buffer.getByte(guessedIndex) != (byte) '$' || buffer.writerIndex() - guessedIndex < 5) {
+ return false;
+ }
+ if (buffer.getByte(guessedIndex + 4) == ','
+ && isLetter(buffer.getByte(guessedIndex + 1))
+ && isLetter(buffer.getByte(guessedIndex + 2))
+ && isLetter(buffer.getByte(guessedIndex + 3))) {
+ return true;
+ }
+ return false;
+ }
+ });
+
+ if (beginIndex > 0) {
+
+ buf.readerIndex(beginIndex);
+
+ int endIndex = buf.indexOf(beginIndex, buf.writerIndex(), (byte) '\n');
+
+ if (endIndex > 0) {
+ ChannelBuffer frame = buf.readBytes(endIndex - beginIndex);
+ buf.readByte(); // delimiter
+ return frame;
+ }
+
+ }
+
+ return null;
+ }
+
+}