From 59416923dcb3a756eaf532cc4259f2f6625c0762 Mon Sep 17 00:00:00 2001 From: Anton Tananaev Date: Sun, 31 Mar 2019 22:35:39 -0700 Subject: Convert project to gradle --- .../org/traccar/protocol/MeiligaoFrameDecoder.java | 47 ++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 src/main/java/org/traccar/protocol/MeiligaoFrameDecoder.java (limited to 'src/main/java/org/traccar/protocol/MeiligaoFrameDecoder.java') diff --git a/src/main/java/org/traccar/protocol/MeiligaoFrameDecoder.java b/src/main/java/org/traccar/protocol/MeiligaoFrameDecoder.java new file mode 100644 index 000000000..52f9ae26d --- /dev/null +++ b/src/main/java/org/traccar/protocol/MeiligaoFrameDecoder.java @@ -0,0 +1,47 @@ +/* + * Copyright 2013 - 2018 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 io.netty.buffer.ByteBuf; +import io.netty.channel.Channel; +import io.netty.channel.ChannelHandlerContext; +import org.traccar.BaseFrameDecoder; + +public class MeiligaoFrameDecoder extends BaseFrameDecoder { + + private static final int MESSAGE_HEADER = 4; + + @Override + protected Object decode( + ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception { + + // Strip not '$' (0x24) bytes from the beginning + while (buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) != 0x24) { + buf.readByte(); + } + + // Check length and return buffer + if (buf.readableBytes() >= MESSAGE_HEADER) { + int length = buf.getUnsignedShort(buf.readerIndex() + 2); + if (buf.readableBytes() >= length) { + return buf.readRetainedSlice(length); + } + } + + return null; + } + +} -- cgit v1.2.3