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authorPhilipp Prangenberg <philipp.prangenberg@derkurier.de>2016-12-05 12:03:08 +0100
committerPhilipp Prangenberg <philipp.prangenberg@derkurier.de>2016-12-05 12:03:08 +0100
commita21f436a58133f7da0cae06366d729665f3b8f9c (patch)
tree72ff1743d96f79e4a9d85b0d48715e5f9aa67cf9 /src/org/traccar/protocol/At2000FrameDecoder.java
parent960bf899414d89221e92138fdb98777c3f4f73ec (diff)
parent40607036c5aa6385a7ae3f3a283bf107238a5944 (diff)
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Merge remote-tracking branch 'upstream/master'
Diffstat (limited to 'src/org/traccar/protocol/At2000FrameDecoder.java')
-rw-r--r--src/org/traccar/protocol/At2000FrameDecoder.java57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/org/traccar/protocol/At2000FrameDecoder.java b/src/org/traccar/protocol/At2000FrameDecoder.java
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+++ b/src/org/traccar/protocol/At2000FrameDecoder.java
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+/*
+ * Copyright 2016 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class At2000FrameDecoder extends FrameDecoder {
+
+ private static final int BLOCK_LENGTH = 16;
+
+ private boolean firstPacket = true;
+
+ @Override
+ protected Object decode(
+ ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+ if (buf.readableBytes() < 5) {
+ return null;
+ }
+
+ int length;
+ if (firstPacket) {
+ firstPacket = false;
+ length = buf.getUnsignedMedium(buf.readerIndex() + 2);
+ } else {
+ length = buf.getUnsignedMedium(buf.readerIndex() + 1);
+ }
+
+ length += BLOCK_LENGTH;
+ if (length % BLOCK_LENGTH != 0) {
+ length = (length / BLOCK_LENGTH + 1) * BLOCK_LENGTH;
+ }
+
+ if (buf.readableBytes() >= length) {
+ return buf.readBytes(length);
+ }
+
+ return null;
+ }
+
+}