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authorAnton Tananaev <anton.tananaev@gmail.com>2021-09-27 12:27:53 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2021-09-27 12:27:53 -0700
commit2204c9830058fe33a4bf426636468a9ec0749a83 (patch)
tree9dbb7c37cb8737ea03bd56bf649e93f8e803941d /src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java
parent5b262c14aaf48919232abe9c41cb0d3288e56427 (diff)
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Add custom frame decoder
Diffstat (limited to 'src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java b/src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java
new file mode 100644
index 000000000..0fb82528b
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/NavtelecomFrameDecoder.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2021 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;
+import org.traccar.BasePipelineFactory;
+
+import java.nio.charset.StandardCharsets;
+import java.util.BitSet;
+
+public class NavtelecomFrameDecoder extends BaseFrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.getByte(buf.readerIndex()) == '@') {
+
+ int length = buf.getUnsignedShortLE(12) + 12 + 2 + 2;
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+
+ } else {
+
+ NavtelecomProtocolDecoder protocolDecoder =
+ BasePipelineFactory.getHandler(ctx.pipeline(), NavtelecomProtocolDecoder.class);
+ if (protocolDecoder == null) {
+ throw new RuntimeException("Decoder not found");
+ }
+
+ String type = buf.getCharSequence(buf.readerIndex(), 2, StandardCharsets.US_ASCII).toString();
+ BitSet bits = protocolDecoder.getBits();
+
+ if (type.equals("~A")) {
+ int count = buf.getUnsignedByte(buf.readerIndex() + 2);
+ int length = 2 + 1 + 1;
+
+ for (int i = 0; i < count; i++) {
+ for (int j = 0; j < bits.length(); j++) {
+ if (bits.get(j)) {
+ length += NavtelecomProtocolDecoder.getItemLength(j + 1);
+ }
+ }
+ }
+
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+ } else {
+ throw new UnsupportedOperationException("Unsupported message type: " + type);
+ }
+
+ }
+
+ return null;
+ }
+
+}