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| author | Anton Tananaev <anton.tananaev@gmail.com> | 2022-09-21 09:57:52 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-09-21 09:57:52 -0700 |
| commit | d5b1385596f79da2514ea7cccf27e9bdeebcacae (patch) | |
| tree | f7b2d44f09dee52c09c2c7e2384f0c27f1e65fa1 /src/main/java/org/traccar/helper | |
| parent | 561647947118a86256dbb584f6da450334462739 (diff) | |
| parent | 7aa230b9ddcd5540e7ff9c9b3d9bcf5119175c46 (diff) | |
| download | trackermap-server-d5b1385596f79da2514ea7cccf27e9bdeebcacae.tar.gz trackermap-server-d5b1385596f79da2514ea7cccf27e9bdeebcacae.tar.bz2 trackermap-server-d5b1385596f79da2514ea7cccf27e9bdeebcacae.zip | |
Merge pull request #4912 from stefanclark/Xexun2Encoder
Implement Xexun2 encoder
Diffstat (limited to 'src/main/java/org/traccar/helper')
| -rw-r--r-- | src/main/java/org/traccar/helper/Checksum.java | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/Checksum.java b/src/main/java/org/traccar/helper/Checksum.java index 8c3d0063a..db5817275 100644 --- a/src/main/java/org/traccar/helper/Checksum.java +++ b/src/main/java/org/traccar/helper/Checksum.java @@ -200,4 +200,19 @@ public final class Checksum { return (10 - (checksum % 10)) % 10; } + public static int ip(ByteBuffer data) { + int sum = 0; + while (data.remaining() > 0) { + sum += data.get() & 0xff; + if ((sum & 0x80000000) > 0) { + sum = (sum & 0xffff) + (sum >> 16); + } + } + while ((sum >> 16) > 0) { + sum = (sum & 0xffff) + sum >> 16; + } + sum = (sum == 0xffff) ? sum & 0xffff : (~sum) & 0xffff; + return sum; + } + } |