26 lines
741 B
Java
26 lines
741 B
Java
package com.eveningoutpost.dexdrip.G5Model;
|
|
|
|
import com.eveningoutpost.dexdrip.ImportedLibraries.dexcom.CRC16;
|
|
|
|
/**
|
|
* Created by jcostik1 on 3/24/16.
|
|
*/
|
|
public class CRC {
|
|
|
|
public static byte[] calculate(byte b) {
|
|
int crcShort = 0;
|
|
crcShort = ((crcShort >>> 8) | (crcShort << 8)) & 0xffff;
|
|
crcShort ^= (b & 0xff);
|
|
crcShort ^= ((crcShort & 0xff) >> 4);
|
|
crcShort ^= (crcShort << 12) & 0xffff;
|
|
crcShort ^= ((crcShort & 0xFF) << 5) & 0xffff;
|
|
crcShort &= 0xffff;
|
|
return new byte[] {(byte) (crcShort & 0xff), (byte) ((crcShort >> 8) & 0xff)};
|
|
}
|
|
|
|
public static byte[] calculate(byte[] bytes, int start, int end) {
|
|
return CRC16.calculate(bytes, 0, end);
|
|
}
|
|
|
|
}
|