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Diffstat (limited to 'src/main/java/org/traccar/protocol/ArnaviFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/ArnaviFrameDecoder.java82
1 files changed, 82 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/ArnaviFrameDecoder.java b/src/main/java/org/traccar/protocol/ArnaviFrameDecoder.java
new file mode 100644
index 000000000..473e8b2c7
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/ArnaviFrameDecoder.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2020 Anton Tananaev (anton@traccar.org)
+ * Copyright 2017 Ivan Muratov (binakot@gmail.com)
+ *
+ * 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.helper.BufferUtil;
+
+public class ArnaviFrameDecoder extends BaseFrameDecoder {
+
+ private static final int HEADER_LENGTH = 10;
+ private static final int PACKET_WRAPPER_LENGTH = 8;
+ private static final int RESULT_TYPE = 0xfd;
+ private static final byte PACKAGE_END_SIGN = 0x5d;
+
+ private boolean firstPacket = true;
+
+ @Override
+ protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() < 4) {
+ return null;
+ }
+
+ if (buf.getByte(buf.readerIndex()) == '$') {
+
+ int index = BufferUtil.indexOf("\r\n", buf);
+ if (index > 0) {
+ ByteBuf frame = buf.readRetainedSlice(index - buf.readerIndex());
+ buf.skipBytes(2);
+ return frame;
+ }
+
+ } else {
+
+ int length;
+ if (firstPacket) {
+ firstPacket = false;
+ length = HEADER_LENGTH;
+ } else {
+ int type = buf.getUnsignedByte(1);
+ if (type == RESULT_TYPE) {
+ length = 4;
+ } else {
+ int index = 2;
+ while (index + PACKET_WRAPPER_LENGTH < buf.readableBytes()
+ && buf.getByte(index) != PACKAGE_END_SIGN) {
+ index += PACKET_WRAPPER_LENGTH + buf.getUnsignedShortLE(index + 1);
+ }
+ if (buf.getByte(index) != PACKAGE_END_SIGN) {
+ return null;
+ }
+ length = index + 1;
+ }
+ }
+
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+
+ }
+
+ return null;
+ }
+
+}