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Diffstat (limited to 'src/main/java/org/traccar/protocol/AtrackFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/AtrackFrameDecoder.java80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/AtrackFrameDecoder.java b/src/main/java/org/traccar/protocol/AtrackFrameDecoder.java
new file mode 100644
index 000000000..f071e2d97
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/AtrackFrameDecoder.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2017 - 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;
+import org.traccar.helper.BufferUtil;
+
+import java.nio.charset.StandardCharsets;
+
+public class AtrackFrameDecoder extends BaseFrameDecoder {
+
+ private static final int KEEPALIVE_LENGTH = 12;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ if (buf.readableBytes() >= 2) {
+
+ if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {
+
+ if (buf.readableBytes() >= KEEPALIVE_LENGTH) {
+ return buf.readRetainedSlice(KEEPALIVE_LENGTH);
+ }
+
+ } else if (buf.getUnsignedShort(buf.readerIndex()) == 0x4050 && buf.getByte(buf.readerIndex() + 2) != ',') {
+
+ if (buf.readableBytes() > 6) {
+ int length = buf.getUnsignedShort(buf.readerIndex() + 4) + 4 + 2;
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+ }
+
+ } else {
+
+ int lengthStart = buf.indexOf(buf.readerIndex() + 3, buf.writerIndex(), (byte) ',') + 1;
+ if (lengthStart > 0) {
+ int lengthEnd = buf.indexOf(lengthStart, buf.writerIndex(), (byte) ',');
+ if (lengthEnd > 0) {
+ int length = lengthEnd + Integer.parseInt(buf.toString(
+ lengthStart, lengthEnd - lengthStart, StandardCharsets.US_ASCII));
+ if (buf.readableBytes() > length && buf.getByte(buf.readerIndex() + length) == '\n') {
+ length += 1;
+ }
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+ }
+ } else {
+ int endIndex = BufferUtil.indexOf("\r\n", buf);
+ if (endIndex > 0) {
+ return buf.readRetainedSlice(endIndex - buf.readerIndex() + 2);
+ }
+ }
+
+ }
+
+ }
+
+ return null;
+ }
+
+}