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Diffstat (limited to 'src/main/java/org/traccar/protocol/UlbotechFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/UlbotechFrameDecoder.java70
1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/UlbotechFrameDecoder.java b/src/main/java/org/traccar/protocol/UlbotechFrameDecoder.java
new file mode 100644
index 000000000..f141dc9b7
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/UlbotechFrameDecoder.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2014 - 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 org.traccar.BaseFrameDecoder;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+
+public class UlbotechFrameDecoder extends BaseFrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() < 2) {
+ return null;
+ }
+
+ if (buf.getUnsignedByte(buf.readerIndex()) == 0xF8) {
+
+ int index = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), (byte) 0xF8);
+ if (index != -1) {
+ ByteBuf result = Unpooled.buffer(index + 1 - buf.readerIndex());
+
+ while (buf.readerIndex() <= index) {
+ int b = buf.readUnsignedByte();
+ if (b == 0xF7) {
+ int ext = buf.readUnsignedByte();
+ if (ext == 0x00) {
+ result.writeByte(0xF7);
+ } else if (ext == 0x0F) {
+ result.writeByte(0xF8);
+ }
+ } else {
+ result.writeByte(b);
+ }
+ }
+
+ return result;
+ }
+
+ } else {
+
+ int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '#');
+ if (index != -1) {
+ return buf.readRetainedSlice(index + 1 - buf.readerIndex());
+ }
+
+ }
+
+ return null;
+ }
+
+}