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| author | casswarry0 <casswarry0@gmail.com> | 2023-01-17 17:14:53 -0700 |
|---|---|---|
| committer | casswarry0 <casswarry0@gmail.com> | 2023-01-17 17:14:53 -0700 |
| commit | 7338b8730949ed027b3f8b31d7dca20687ebbb8b (patch) | |
| tree | c2d171e6121818ab511460a786f69aab97a2a628 /src/main/java/org/traccar/helper/Checksum.java | |
| parent | cdecd3fa4427a382c0b09f8ad9d69ec14388960a (diff) | |
| parent | 85501f9cf4918d5eee345f83aed7a31eecb26b8d (diff) | |
| download | trackermap-server-7338b8730949ed027b3f8b31d7dca20687ebbb8b.tar.gz trackermap-server-7338b8730949ed027b3f8b31d7dca20687ebbb8b.tar.bz2 trackermap-server-7338b8730949ed027b3f8b31d7dca20687ebbb8b.zip | |
Merge branch 'master' into develop
Diffstat (limited to 'src/main/java/org/traccar/helper/Checksum.java')
| -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; + } + } |