1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/OrionFrameDecoder.java b/src/main/java/org/traccar/protocol/OrionFrameDecoder.java
new file mode 100644
index 000000000..948806609
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/OrionFrameDecoder.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2014 - 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;
+
+public class OrionFrameDecoder extends BaseFrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        int length = 6;
+
+        if (buf.readableBytes() >= length) {
+
+            int type = buf.getUnsignedByte(buf.readerIndex() + 2) & 0x0f;
+
+            if (type == OrionProtocolDecoder.MSG_USERLOG && buf.readableBytes() >= length + 5) {
+
+                int index = buf.readerIndex() + 3;
+                int count = buf.getUnsignedByte(index) & 0x0f;
+                index += 5;
+                length += 5;
+
+                for (int i = 0; i < count; i++) {
+                    if (buf.readableBytes() < length) {
+                        return null;
+                    }
+                    int logLength = buf.getUnsignedByte(index + 1);
+                    index += logLength;
+                    length += logLength;
+                }
+
+                if (buf.readableBytes() >= length) {
+                    return buf.readRetainedSlice(length);
+                }
+
+            } else if (type == OrionProtocolDecoder.MSG_SYSLOG && buf.readableBytes() >= length + 12) {
+
+                length += buf.getUnsignedShortLE(buf.readerIndex() + 8);
+                if (buf.readableBytes() >= length) {
+                    return buf.readRetainedSlice(length);
+                }
+
+            }
+        }
+
+        return null;
+    }
+
+}