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Diffstat (limited to 'src/main/java/org/traccar/protocol/StbFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/StbFrameDecoder.java55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/StbFrameDecoder.java b/src/main/java/org/traccar/protocol/StbFrameDecoder.java
new file mode 100644
index 000000000..6a4157f17
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/StbFrameDecoder.java
@@ -0,0 +1,55 @@
+/*
+ * 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;
+
+public class StbFrameDecoder extends BaseFrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ int startIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '{');
+ if (startIndex >= 0) {
+
+ buf.readerIndex(startIndex);
+
+ int currentIndex = startIndex + 1;
+ int nesting = 1;
+ while (currentIndex < buf.writerIndex() && nesting > 0) {
+ byte currentByte = buf.getByte(currentIndex);
+ if (currentByte == '{') {
+ nesting += 1;
+ } else if (currentByte == '}') {
+ nesting -= 1;
+ }
+ currentIndex += 1;
+ }
+
+ if (nesting == 0) {
+ return buf.readRetainedSlice(currentIndex - startIndex);
+ }
+
+ }
+
+ return null;
+ }
+
+}