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authorAnton Tananaev <anton.tananaev@gmail.com>2015-11-07 11:16:53 +1300
committerAnton Tananaev <anton.tananaev@gmail.com>2015-11-07 11:16:53 +1300
commit1261fb0bc31be9b89740f7e9799179d57118d127 (patch)
tree5c61ffe5cf2a6cabef40c33fe8c97cecc55b3203 /src/org/traccar/protocol
parentc55ecff2f0d6b83973953b3ae4f86e14a923b6c7 (diff)
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Implement Huabao frame decoder
Diffstat (limited to 'src/org/traccar/protocol')
-rw-r--r--src/org/traccar/protocol/HuabaoFrameDecoder.java58
1 files changed, 58 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/HuabaoFrameDecoder.java b/src/org/traccar/protocol/HuabaoFrameDecoder.java
new file mode 100644
index 000000000..003876fe5
--- /dev/null
+++ b/src/org/traccar/protocol/HuabaoFrameDecoder.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015 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.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class HuabaoFrameDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() < 2) {
+ return null;
+ }
+
+ int index = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), (byte) 0x7e);
+ if (index != -1) {
+ ChannelBuffer result = ChannelBuffers.buffer(index + 1 - buf.readerIndex());
+
+ while (buf.readerIndex() <= index) {
+ int b = buf.readUnsignedByte();
+ if (b == 0x7d) {
+ int ext = buf.readUnsignedByte();
+ if (ext == 0x01) {
+ result.writeByte(0x7d);
+ } else if (ext == 0x02) {
+ result.writeByte(0x7e);
+ }
+ } else {
+ result.writeByte(b);
+ }
+ }
+
+ return result;
+ }
+
+ return null;
+ }
+
+}