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authorAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
committerAnton Tananaev <anton.tananaev@gmail.com>2019-03-31 22:35:39 -0700
commit59416923dcb3a756eaf532cc4259f2f6625c0762 (patch)
tree9082dae6616deac8fda432b7bfd80e4a52b6d9dc /src/main/java/org/traccar/protocol/AplicomFrameDecoder.java
parent79a129dd6327d932133d6b9a50190d3f4927bff9 (diff)
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Convert project to gradle
Diffstat (limited to 'src/main/java/org/traccar/protocol/AplicomFrameDecoder.java')
-rw-r--r--src/main/java/org/traccar/protocol/AplicomFrameDecoder.java62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/AplicomFrameDecoder.java b/src/main/java/org/traccar/protocol/AplicomFrameDecoder.java
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+++ b/src/main/java/org/traccar/protocol/AplicomFrameDecoder.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2013 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 AplicomFrameDecoder extends BaseFrameDecoder {
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+ // Skip Alive message
+ while (buf.isReadable() && Character.isDigit(buf.getByte(buf.readerIndex()))) {
+ buf.readByte();
+ }
+
+ // Check minimum length
+ if (buf.readableBytes() < 11) {
+ return null;
+ }
+
+ // Read flags
+ int version = buf.getUnsignedByte(buf.readerIndex() + 1);
+ int offset = 1 + 1 + 3;
+ if ((version & 0x80) != 0) {
+ offset += 4;
+ }
+
+ // Get data length
+ int length = buf.getUnsignedShort(buf.readerIndex() + offset);
+ offset += 2;
+ if ((version & 0x40) != 0) {
+ offset += 3;
+ }
+ length += offset; // add header
+
+ // Return buffer
+ if (buf.readableBytes() >= length) {
+ return buf.readRetainedSlice(length);
+ }
+
+ return null;
+ }
+
+}