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Diffstat (limited to 'src/org/traccar/helper/BcdUtil.java')
-rw-r--r--src/org/traccar/helper/BcdUtil.java63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/org/traccar/helper/BcdUtil.java b/src/org/traccar/helper/BcdUtil.java
new file mode 100644
index 000000000..a248daf22
--- /dev/null
+++ b/src/org/traccar/helper/BcdUtil.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 - 2016 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * 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.helper;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+
+public final class BcdUtil {
+
+ private BcdUtil() {
+ }
+
+ public static int readInteger(ChannelBuffer buf, int digits) {
+ int result = 0;
+
+ for (int i = 0; i < digits / 2; i++) {
+ int b = buf.readUnsignedByte();
+ result *= 10;
+ result += b >>> 4;
+ result *= 10;
+ result += b & 0x0f;
+ }
+
+ if (digits % 2 != 0) {
+ int b = buf.getUnsignedByte(buf.readerIndex());
+ result *= 10;
+ result += b >>> 4;
+ }
+
+ return result;
+ }
+
+ public static double readCoordinate(ChannelBuffer buf) {
+ int b1 = buf.readUnsignedByte();
+ int b2 = buf.readUnsignedByte();
+ int b3 = buf.readUnsignedByte();
+ int b4 = buf.readUnsignedByte();
+
+ double value = (b2 & 0xf) * 10 + (b3 >> 4);
+ value += (((b3 & 0xf) * 10 + (b4 >> 4)) * 10 + (b4 & 0xf)) / 1000.0;
+ value /= 60;
+ value += ((b1 >> 4 & 0x7) * 10 + (b1 & 0xf)) * 10 + (b2 >> 4);
+
+ if ((b1 & 0x80) != 0) {
+ value = -value;
+ }
+
+ return value;
+ }
+
+}