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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/NavisFrameDecoder.java
parent79a129dd6327d932133d6b9a50190d3f4927bff9 (diff)
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Convert project to gradle
Diffstat (limited to 'src/main/java/org/traccar/protocol/NavisFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/NavisFrameDecoder.java109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/NavisFrameDecoder.java b/src/main/java/org/traccar/protocol/NavisFrameDecoder.java
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--- /dev/null
+++ b/src/main/java/org/traccar/protocol/NavisFrameDecoder.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2019 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 java.nio.charset.StandardCharsets;
+import org.traccar.BaseFrameDecoder;
+import org.traccar.BasePipelineFactory;
+
+public class NavisFrameDecoder extends BaseFrameDecoder {
+
+ private static final int NTCB_HEADER_LENGTH = 16;
+ private static final int NTCB_LENGTH_OFFSET = 12;
+ private static final int FLEX_HEADER_LENGTH = 2;
+
+ private int flexDataSize;
+
+ public void setFlexDataSize(int flexDataSize) {
+ this.flexDataSize = flexDataSize;
+ }
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.getByte(buf.readerIndex()) == 0x7F) {
+ return buf.readRetainedSlice(1); // keep alive
+ }
+
+ if (ctx != null && flexDataSize == 0) {
+ NavisProtocolDecoder protocolDecoder =
+ BasePipelineFactory.getHandler(ctx.pipeline(), NavisProtocolDecoder.class);
+ if (protocolDecoder != null) {
+ flexDataSize = protocolDecoder.getFlexDataSize();
+ }
+ }
+
+ if (flexDataSize > 0) {
+
+ if (buf.readableBytes() > FLEX_HEADER_LENGTH) {
+ int length = 0;
+ String type = buf.toString(buf.readerIndex(), 2, StandardCharsets.US_ASCII);
+ switch (type) {
+ // FLEX 1.0
+ case "~A":
+ length = flexDataSize * buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH) + 1 + 1;
+ break;
+ case "~T":
+ length = flexDataSize + 4 + 1;
+ break;
+ case "~C":
+ length = flexDataSize + 1;
+ break;
+ // FLEX 2.0 (Extra packages)
+ case "~E":
+ length++;
+ for (int i = 0; i < buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH); i++) {
+ if (buf.readableBytes() > FLEX_HEADER_LENGTH + length + 1) {
+ length += buf.getUnsignedShort(length + FLEX_HEADER_LENGTH) + 2;
+ } else {
+ return null;
+ }
+ }
+ length++;
+ break;
+ case "~X":
+ length = buf.getUnsignedShortLE(buf.readerIndex() + FLEX_HEADER_LENGTH) + 4 + 1;
+ break;
+ default:
+ return null;
+ }
+
+ if (buf.readableBytes() >= FLEX_HEADER_LENGTH + length) {
+ return buf.readRetainedSlice(buf.readableBytes());
+ }
+ }
+
+ } else {
+
+ if (buf.readableBytes() < NTCB_HEADER_LENGTH) {
+ return null;
+ }
+
+ int length = NTCB_HEADER_LENGTH + buf.getUnsignedShortLE(buf.readerIndex() + NTCB_LENGTH_OFFSET);
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+
+ }
+
+ return null;
+ }
+
+}