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authorAnton Tananaev <anton.tananaev@gmail.com>2015-07-07 15:20:48 +1200
committerAnton Tananaev <anton.tananaev@gmail.com>2015-07-07 15:20:48 +1200
commit6eb1837b796f51bd2a84d091b706a7ae1d4952a0 (patch)
tree859f37cc0db189c7564d45be888fe7758b9b02b1 /src/org/traccar/helper/Crc.java
parentfa4215999ef38879ac72540c44e46ca39858a20b (diff)
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Improve Aplicom id parsing
Diffstat (limited to 'src/org/traccar/helper/Crc.java')
-rw-r--r--src/org/traccar/helper/Crc.java30
1 files changed, 17 insertions, 13 deletions
diff --git a/src/org/traccar/helper/Crc.java b/src/org/traccar/helper/Crc.java
index 213d1192a..418ec3132 100644
--- a/src/org/traccar/helper/Crc.java
+++ b/src/org/traccar/helper/Crc.java
@@ -154,21 +154,25 @@ public class Crc {
return String.format("*%02x", checksum).toUpperCase();
}
- public static String luhnChecksum(String s) {
- int sum = 0;
- boolean evenPosition = true;
- for (int i = s.length() - 1; i >= 0; i--) {
- int n = Integer.parseInt(s.substring(i, i + 1));
- if (evenPosition) {
- n *= 2;
- if (n > 9) {
- n = (n % 10) + 1;
+ public static long luhnChecksum(long imei) {
+ long checksum = 0;
+ long remain = imei;
+
+ for (int i = 0; remain != 0; i++) {
+ long digit = remain % 10;
+
+ if ((i % 2) == 0) {
+ digit *= 2;
+ if (digit >= 10) {
+ digit = 1 + (digit % 10);
}
}
- sum += n;
- evenPosition = !evenPosition;
+
+ checksum += digit;
+ remain /= 10;
}
- return String.valueOf(10 - sum % 10);
- }
+
+ return 10 - (checksum % 10);
+ }
}