diff options
Diffstat (limited to 'src/org/traccar/helper/ChannelBufferTools.java')
| -rw-r--r-- | src/org/traccar/helper/ChannelBufferTools.java | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/org/traccar/helper/ChannelBufferTools.java b/src/org/traccar/helper/ChannelBufferTools.java index c0df86bcd..ef2ebc313 100644 --- a/src/org/traccar/helper/ChannelBufferTools.java +++ b/src/org/traccar/helper/ChannelBufferTools.java @@ -97,6 +97,28 @@ public class ChannelBufferTools { return result.toString(); } + + /** + * Read BCD coded coordinate (first byte has sign bit) + */ + 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; + } + /** * Convert integer array to byte array |