1 files changed, 95 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/H02FrameDecoder.java b/src/main/java/org/traccar/protocol/H02FrameDecoder.java
new file mode 100644
index 000000000..583ad599f
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/H02FrameDecoder.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2013 - 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 H02FrameDecoder extends BaseFrameDecoder {
+
+    private static final int MESSAGE_SHORT = 32;
+    private static final int MESSAGE_LONG = 45;
+
+    private int messageLength;
+
+    public H02FrameDecoder(int messageLength) {
+        this.messageLength = messageLength;
+    }
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        char marker = (char) buf.getByte(buf.readerIndex());
+
+        while (marker != '*' && marker != '$' && marker != 'X' && buf.readableBytes() > 0) {
+            buf.skipBytes(1);
+            if (buf.readableBytes() > 0) {
+                marker = (char) buf.getByte(buf.readerIndex());
+            }
+        }
+
+        switch (marker) {
+            case '*':
+
+                // Return text message
+                int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '#');
+                if (index != -1) {
+                    ByteBuf result = buf.readRetainedSlice(index + 1 - buf.readerIndex());
+                    while (buf.isReadable()
+                            && (buf.getByte(buf.readerIndex()) == '\r' || buf.getByte(buf.readerIndex()) == '\n')) {
+                        buf.readByte(); // skip new line
+                    }
+                    return result;
+                }
+
+                break;
+
+            case '$':
+
+                if (messageLength == 0) {
+                    if (buf.readableBytes() == MESSAGE_LONG) {
+                        messageLength = MESSAGE_LONG;
+                    } else {
+                        messageLength = MESSAGE_SHORT;
+                    }
+                }
+
+                if (buf.readableBytes() >= messageLength) {
+                    return buf.readRetainedSlice(messageLength);
+                }
+
+                break;
+
+            case 'X':
+
+                if (buf.readableBytes() >= MESSAGE_SHORT) {
+                    return buf.readRetainedSlice(MESSAGE_SHORT);
+                }
+
+                break;
+
+            default:
+
+                return null;
+        }
+
+        return null;
+    }
+
+}