From 1261fb0bc31be9b89740f7e9799179d57118d127 Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Sat, 7 Nov 2015 11:16:53 +1300 Subject: Implement Huabao frame decoder --- src/org/traccar/protocol/HuabaoFrameDecoder.java | 58 ++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 src/org/traccar/protocol/HuabaoFrameDecoder.java (limited to 'src/org/traccar') 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; + } + +} -- cgit v1.2.3