From 7c3351939eca27d349417f053ef98a7e4e2668fd Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Sat, 15 Jul 2017 13:17:05 +1200 Subject: Implement GL200 frame decoder --- src/org/traccar/protocol/Gl200FrameDecoder.java | 96 +++++++++++++++++++++++++ src/org/traccar/protocol/Gl200Protocol.java | 5 +- 2 files changed, 98 insertions(+), 3 deletions(-) create mode 100644 src/org/traccar/protocol/Gl200FrameDecoder.java (limited to 'src/org') diff --git a/src/org/traccar/protocol/Gl200FrameDecoder.java b/src/org/traccar/protocol/Gl200FrameDecoder.java new file mode 100644 index 000000000..960c3779a --- /dev/null +++ b/src/org/traccar/protocol/Gl200FrameDecoder.java @@ -0,0 +1,96 @@ +/* + * 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.channel.Channel; +import org.jboss.netty.channel.ChannelHandlerContext; +import org.jboss.netty.handler.codec.frame.FrameDecoder; + +import java.nio.charset.StandardCharsets; +import java.util.Arrays; +import java.util.HashSet; +import java.util.Set; + +public class Gl200FrameDecoder extends FrameDecoder { + + private static final int MINIMUM_LENGTH = 11; + + private static final Set BINARY_HEADERS = new HashSet<>( + Arrays.asList("+RSP", "+BSP", "+EVT", "+BVT", "+INF", "+BNF", "+HBD", "+CRD", "+BRD")); + + public static boolean isBinary(ChannelBuffer buf) { + String header = buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII); + if (header.equals("+ACK")) { + return buf.getByte(buf.readerIndex() + header.length()) != (byte) ':'; + } else { + return BINARY_HEADERS.contains(header); + } + } + + @Override + protected Object decode( + ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception { + + if (buf.readableBytes() < MINIMUM_LENGTH) { + return null; + } + + if (isBinary(buf)) { + + int length; + switch (buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII)) { + case "+ACK": + length = buf.getUnsignedByte(buf.readerIndex() + 6); + break; + case "+INF": + case "+BNF": + length = buf.getUnsignedShort(buf.readerIndex() + 7); + break; + case "+HBD": + length = buf.getUnsignedByte(buf.readerIndex() + 5); + break; + case "+CRD": + case "+BRD": + length = buf.getUnsignedShort(buf.readerIndex() + 6); + break; + default: + length = buf.getUnsignedShort(buf.readerIndex() + 9); + break; + } + + if (buf.readableBytes() >= length) { + return buf.readBytes(length); + } + + } else { + + int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '$'); + if (endIndex < 0) { + endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0); + } + if (endIndex > 0) { + ChannelBuffer frame = buf.readBytes(endIndex - buf.readerIndex()); + buf.readByte(); // delimiter + return frame; + } + + } + + return null; + } + +} diff --git a/src/org/traccar/protocol/Gl200Protocol.java b/src/org/traccar/protocol/Gl200Protocol.java index b3743042c..3ea371085 100644 --- a/src/org/traccar/protocol/Gl200Protocol.java +++ b/src/org/traccar/protocol/Gl200Protocol.java @@ -1,5 +1,5 @@ /* - * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org) + * Copyright 2015 - 2017 Anton Tananaev (anton@traccar.org) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -21,7 +21,6 @@ import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.handler.codec.string.StringDecoder; import org.jboss.netty.handler.codec.string.StringEncoder; import org.traccar.BaseProtocol; -import org.traccar.CharacterDelimiterFrameDecoder; import org.traccar.TrackerServer; import org.traccar.model.Command; @@ -44,7 +43,7 @@ public class Gl200Protocol extends BaseProtocol { serverList.add(new TrackerServer(new ServerBootstrap(), getName()) { @Override protected void addSpecificHandlers(ChannelPipeline pipeline) { - pipeline.addLast("frameDecoder", new CharacterDelimiterFrameDecoder(4096, "$", "\0")); + pipeline.addLast("frameDecoder", new Gl200FrameDecoder()); pipeline.addLast("stringEncoder", new StringEncoder()); pipeline.addLast("stringDecoder", new StringDecoder()); pipeline.addLast("objectEncoder", new Gl200ProtocolEncoder()); -- cgit v1.2.3