1 files changed, 63 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/BcdUtil.java b/src/main/java/org/traccar/helper/BcdUtil.java
new file mode 100644
index 000000000..c87529e32
--- /dev/null
+++ b/src/main/java/org/traccar/helper/BcdUtil.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 - 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.helper;
+
+import io.netty.buffer.ByteBuf;
+
+public final class BcdUtil {
+
+    private BcdUtil() {
+    }
+
+    public static int readInteger(ByteBuf 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(ByteBuf 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;
+    }
+
+}