diff options
Diffstat (limited to 'src/main/java/org/traccar/protocol/RoboTrackFrameDecoder.java')
-rw-r--r-- | src/main/java/org/traccar/protocol/RoboTrackFrameDecoder.java | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/RoboTrackFrameDecoder.java b/src/main/java/org/traccar/protocol/RoboTrackFrameDecoder.java new file mode 100644 index 000000000..85ed6c76f --- /dev/null +++ b/src/main/java/org/traccar/protocol/RoboTrackFrameDecoder.java @@ -0,0 +1,57 @@ +/* + * Copyright 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 RoboTrackFrameDecoder extends BaseFrameDecoder { + + private int messageLength(ByteBuf buf) { + switch (buf.getUnsignedByte(buf.readerIndex())) { + case RoboTrackProtocolDecoder.MSG_ID: + return 69; + case RoboTrackProtocolDecoder.MSG_ACK: + return 3; + case RoboTrackProtocolDecoder.MSG_GPS: + case RoboTrackProtocolDecoder.MSG_GSM: + case RoboTrackProtocolDecoder.MSG_IMAGE_START: + return 24; + case RoboTrackProtocolDecoder.MSG_IMAGE_DATA: + return 8 + buf.getUnsignedShortLE(buf.readerIndex() + 1); + case RoboTrackProtocolDecoder.MSG_IMAGE_END: + return 6; + default: + return Integer.MAX_VALUE; + } + } + + @Override + protected Object decode( + ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception { + + int length = messageLength(buf); + + if (buf.readableBytes() >= length) { + return buf.readRetainedSlice(length); + } + + return null; + } + +} |