aboutsummaryrefslogtreecommitdiff
path: root/src/main/java/org/traccar/protocol/BceFrameDecoder.java
diff options
context:
space:
mode:
authorAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
commit59416923dcb3a756eaf532cc4259f2f6625c0762 (patch)
tree9082dae6616deac8fda432b7bfd80e4a52b6d9dc /src/main/java/org/traccar/protocol/BceFrameDecoder.java
parent79a129dd6327d932133d6b9a50190d3f4927bff9 (diff)
downloadtrackermap-server-59416923dcb3a756eaf532cc4259f2f6625c0762.tar.gz
trackermap-server-59416923dcb3a756eaf532cc4259f2f6625c0762.tar.bz2
trackermap-server-59416923dcb3a756eaf532cc4259f2f6625c0762.zip
Convert project to gradle
Diffstat (limited to 'src/main/java/org/traccar/protocol/BceFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/BceFrameDecoder.java59
1 files changed, 59 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/BceFrameDecoder.java b/src/main/java/org/traccar/protocol/BceFrameDecoder.java
new file mode 100644
index 000000000..381a97696
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/BceFrameDecoder.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2015 - 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 BceFrameDecoder extends BaseFrameDecoder {
+
+ private static final int HANDSHAKE_LENGTH = 7; // "#BCE#\r\n"
+
+ private boolean header = true;
+
+ private static byte checksum(ByteBuf buf, int end) {
+ byte result = 0;
+ for (int i = 0; i < end; i++) {
+ result += buf.getByte(buf.readerIndex() + i);
+ }
+ return result;
+ }
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (header && buf.readableBytes() >= HANDSHAKE_LENGTH) {
+ buf.skipBytes(HANDSHAKE_LENGTH);
+ header = false;
+ }
+
+ int end = 8; // IMEI
+
+ while (buf.readableBytes() >= end + 2 + 1 + 1 + 1) {
+ end += buf.getUnsignedShortLE(buf.readerIndex() + end) + 2;
+
+ if (buf.readableBytes() > end && checksum(buf, end) == buf.getByte(buf.readerIndex() + end)) {
+ return buf.readRetainedSlice(end + 1);
+ }
+ }
+
+ return null;
+ }
+
+}