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authorAnton Tananaev <anton.tananaev@gmail.com>2017-07-15 13:17:05 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2017-07-15 13:17:05 +1200
commit7c3351939eca27d349417f053ef98a7e4e2668fd (patch)
tree07717d2f308d94aaeb3216f0a432d03a7760b2eb /src/org/traccar/protocol/Gl200FrameDecoder.java
parent7a17135f9b0b1ae127b9cb5ea4f29e0af98a813b (diff)
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Implement GL200 frame decoder
Diffstat (limited to 'src/org/traccar/protocol/Gl200FrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/Gl200FrameDecoder.java96
1 files changed, 96 insertions, 0 deletions
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<String> 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;
+ }
+
+}