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authorValerii Vyshniak <valeravi@vi-soft.com.ua>2017-11-23 00:15:35 +0100
committerValerii Vyshniak <valeravi@vi-soft.com.ua>2017-11-23 00:15:35 +0100
commitd0a55d5a5c52e2f668e7c74952fca59019b0c405 (patch)
treed4c9b8cd2d19b3c106d85243e171e9b2d52e9ee7 /src/org/traccar/protocol
parente5a8be1987aecf3735801165ee19c1bcdd4fcc05 (diff)
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T580W: tk103 frame decoder improvements
- skip garbarge before frame start to speed-up parsing; - speed-up free text block parsing; - some recovery procedure for stuck frames (becauce of wrong amount of start/end/free text frame symbols, etc.).
Diffstat (limited to 'src/org/traccar/protocol')
-rw-r--r--src/org/traccar/protocol/Tk103FrameDecoder.java55
1 files changed, 38 insertions, 17 deletions
diff --git a/src/org/traccar/protocol/Tk103FrameDecoder.java b/src/org/traccar/protocol/Tk103FrameDecoder.java
index 17e791553..a27eb0714 100644
--- a/src/org/traccar/protocol/Tk103FrameDecoder.java
+++ b/src/org/traccar/protocol/Tk103FrameDecoder.java
@@ -17,35 +17,46 @@
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;
-import java.nio.ByteOrder;
-
public class Tk103FrameDecoder extends FrameDecoder {
+ private static final int FRAME_MIN_SIZE = 2;
+ private static final int FRAME_MAX_SIZE = 1024;
+ private static final byte FRAME_START_SYMBOL = (byte) '(';
+ private static final byte FRAME_END_SYMBOL = (byte) ')';
+ private static final byte FRAME_FREE_TEXT_BLOCK_SYMBOL = (byte) '$';
+
@Override
protected Object decode(
ChannelHandlerContext ctx,
Channel channel,
ChannelBuffer buf) throws Exception {
- if (buf.readableBytes() < 2) {
+ if (buf.readableBytes() < FRAME_MIN_SIZE) {
+ return null;
+ }
+
+ int indexStart = buf.indexOf(buf.readerIndex(), buf.writerIndex(), FRAME_START_SYMBOL);
+ if (indexStart == -1) {
+ buf.clear();
return null;
}
+ indexStart++;
- int index;
- for (index = buf.readerIndex(); true; index++) {
- index = buf.indexOf(index, buf.writerIndex(), (byte) ')');
+ int index, cnt;
+ for (index = indexStart, cnt = 0;; index++) {
+ int i = index;
+ index = buf.indexOf(index, buf.writerIndex(), FRAME_END_SYMBOL);
if (index == -1) {
break;
}
- int cnt = 0;
- for (int i = buf.readerIndex(); i < index; i++) {
- if (buf.getByte(i) == (byte) '$') {
- cnt++;
+ for (;; i++, cnt++) {
+ i = buf.indexOf(i, index, FRAME_FREE_TEXT_BLOCK_SYMBOL);
+ if (i == -1 || i >= index) {
+ break;
}
}
if (cnt % 2 == 0) {
@@ -53,14 +64,24 @@ public class Tk103FrameDecoder extends FrameDecoder {
}
}
- if (index != -1) {
- ChannelBuffer result = ChannelBuffers.buffer(ByteOrder.LITTLE_ENDIAN, index + 1 - buf.readerIndex());
- buf.readBytes(result, index + 1 - buf.readerIndex());
- result.writerIndex(result.writerIndex() - 1);
- return result;
+ if (index == -1) {
+ while (buf.readableBytes() > FRAME_MAX_SIZE) {
+ int i = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), FRAME_START_SYMBOL);
+ if (i == -1) {
+ buf.clear();
+ } else {
+ buf.readerIndex(i);
+ }
+ }
+ return null;
}
- return null;
+ buf.readerIndex(indexStart);
+ ChannelBuffer result = buf.readBytes(index - indexStart);
+ buf.readerIndex(buf.readerIndex() + 1);
+
+ return result;
+
}
}