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-rw-r--r--src/org/traccar/protocol/WatchFrameDecoder.java85
1 files changed, 50 insertions, 35 deletions
diff --git a/src/org/traccar/protocol/WatchFrameDecoder.java b/src/org/traccar/protocol/WatchFrameDecoder.java
index 826a8b4d0..9adea2843 100644
--- a/src/org/traccar/protocol/WatchFrameDecoder.java
+++ b/src/org/traccar/protocol/WatchFrameDecoder.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 - 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.
@@ -25,47 +25,62 @@ import java.nio.charset.StandardCharsets;
public class WatchFrameDecoder extends FrameDecoder {
- public static final int MESSAGE_HEADER = 20;
-
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
- if (buf.readableBytes() >= MESSAGE_HEADER) {
- ChannelBuffer lengthBuffer = ChannelBuffers.dynamicBuffer();
- buf.getBytes(buf.readerIndex() + MESSAGE_HEADER - 4 - 1, lengthBuffer, 4);
- int length = Integer.parseInt(lengthBuffer.toString(StandardCharsets.US_ASCII), 16) + MESSAGE_HEADER + 1;
- if (buf.readableBytes() >= length) {
- ChannelBuffer frame = ChannelBuffers.dynamicBuffer();
- int endIndex = buf.readerIndex() + length;
- while (buf.readerIndex() < endIndex) {
- byte b = buf.readByte();
- if (b == 0x7D) {
- switch (buf.readByte()) {
- case 0x01:
- frame.writeByte(0x7D);
- break;
- case 0x02:
- frame.writeByte(0x5B);
- break;
- case 0x03:
- frame.writeByte(0x5D);
- break;
- case 0x04:
- frame.writeByte(0x2C);
- break;
- case 0x05:
- frame.writeByte(0x2A);
- break;
- default:
- throw new IllegalArgumentException();
- }
- } else {
- frame.writeByte(b);
+ int idIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '*') + 1;
+ if (idIndex <= 0) {
+ return null;
+ }
+
+ int lengthIndex = buf.indexOf(idIndex, buf.writerIndex(), (byte) '*') + 1;
+ if (lengthIndex <= 0) {
+ return null;
+ } else if (lengthIndex - idIndex > 10 + 1) {
+ lengthIndex = buf.indexOf(lengthIndex, buf.writerIndex(), (byte) '*') + 1;
+ if (lengthIndex <= 0) {
+ return null;
+ }
+ }
+
+ int payloadIndex = buf.indexOf(lengthIndex, buf.writerIndex(), (byte) '*');
+ if (payloadIndex < 0) {
+ return null;
+ }
+
+ int length = Integer.parseInt(
+ buf.toString(lengthIndex, payloadIndex - lengthIndex, StandardCharsets.US_ASCII), 16);
+ if (buf.readableBytes() >= payloadIndex + 1 + length + 1) {
+ ChannelBuffer frame = ChannelBuffers.dynamicBuffer();
+ int endIndex = buf.readerIndex() + payloadIndex + 1 + length + 1;
+ while (buf.readerIndex() < endIndex) {
+ byte b = buf.readByte();
+ if (b == 0x7D) {
+ switch (buf.readByte()) {
+ case 0x01:
+ frame.writeByte(0x7D);
+ break;
+ case 0x02:
+ frame.writeByte(0x5B);
+ break;
+ case 0x03:
+ frame.writeByte(0x5D);
+ break;
+ case 0x04:
+ frame.writeByte(0x2C);
+ break;
+ case 0x05:
+ frame.writeByte(0x2A);
+ break;
+ default:
+ throw new IllegalArgumentException();
}
+ } else {
+ frame.writeByte(b);
}
- return frame;
}
+ return frame;
}
return null;