diff options
author | Shuyi Chen <shuyichen@google.com> | 2013-05-22 14:51:55 -0700 |
---|---|---|
committer | Shuyi Chen <shuyichen@google.com> | 2013-05-22 17:19:30 -0700 |
commit | d7955ce24d294fb2014c59d11fca184471056f44 (patch) | |
tree | e260500b0b7639127038495d46a0ad6dcbb6d96c /src/org/xbill/DNS/Serial.java | |
parent | 8f4ce9ea0de51fee918bffe19c434612d6bbb2d7 (diff) | |
download | smack-lollipop-mr1-cts-release.tar.gz |
Add android smack source.HEADandroid-wear-5.0.0_r1android-sdk-4.4.2_r1.0.1android-sdk-4.4.2_r1android-l-preview_r2android-cts-5.1_r9android-cts-5.1_r8android-cts-5.1_r7android-cts-5.1_r6android-cts-5.1_r5android-cts-5.1_r4android-cts-5.1_r3android-cts-5.1_r28android-cts-5.1_r27android-cts-5.1_r26android-cts-5.1_r25android-cts-5.1_r24android-cts-5.1_r23android-cts-5.1_r22android-cts-5.1_r21android-cts-5.1_r20android-cts-5.1_r2android-cts-5.1_r19android-cts-5.1_r18android-cts-5.1_r17android-cts-5.1_r16android-cts-5.1_r15android-cts-5.1_r14android-cts-5.1_r13android-cts-5.1_r10android-cts-5.1_r1android-cts-5.0_r9android-cts-5.0_r8android-cts-5.0_r7android-cts-5.0_r6android-cts-5.0_r5android-cts-5.0_r4android-cts-5.0_r3android-cts-4.4_r4android-cts-4.4_r1android-5.1.1_r9android-5.1.1_r8android-5.1.1_r7android-5.1.1_r6android-5.1.1_r5android-5.1.1_r4android-5.1.1_r38android-5.1.1_r37android-5.1.1_r36android-5.1.1_r35android-5.1.1_r34android-5.1.1_r33android-5.1.1_r30android-5.1.1_r3android-5.1.1_r29android-5.1.1_r28android-5.1.1_r26android-5.1.1_r25android-5.1.1_r24android-5.1.1_r23android-5.1.1_r22android-5.1.1_r20android-5.1.1_r2android-5.1.1_r19android-5.1.1_r18android-5.1.1_r17android-5.1.1_r16android-5.1.1_r15android-5.1.1_r14android-5.1.1_r13android-5.1.1_r12android-5.1.1_r10android-5.1.1_r1android-5.1.0_r5android-5.1.0_r4android-5.1.0_r3android-5.1.0_r1android-5.0.2_r3android-5.0.2_r1android-5.0.1_r1android-5.0.0_r7android-5.0.0_r6android-5.0.0_r5.1android-5.0.0_r5android-5.0.0_r4android-5.0.0_r3android-5.0.0_r2android-5.0.0_r1android-4.4w_r1android-4.4_r1.2.0.1android-4.4_r1.2android-4.4_r1.1.0.1android-4.4_r1.1android-4.4_r1.0.1android-4.4_r1android-4.4_r0.9android-4.4_r0.8android-4.4_r0.7android-4.4.4_r2.0.1android-4.4.4_r2android-4.4.4_r1.0.1android-4.4.4_r1android-4.4.3_r1.1.0.1android-4.4.3_r1.1android-4.4.3_r1.0.1android-4.4.3_r1android-4.4.2_r2.0.1android-4.4.2_r2android-4.4.2_r1.0.1android-4.4.2_r1android-4.4.1_r1.0.1android-4.4.1_r1android-4.3_r3.1android-4.3_r3android-4.3_r2.3android-4.3_r2.2android-4.3_r2.1android-4.3_r2android-4.3_r1.1android-4.3_r1android-4.3_r0.9.1android-4.3_r0.9android-4.3.1_r1tools_r22.2mastermainlollipop-wear-releaselollipop-releaselollipop-mr1-wfc-releaselollipop-mr1-releaselollipop-mr1-fi-releaselollipop-mr1-devlollipop-mr1-cts-releaselollipop-devlollipop-cts-releasel-previewkitkat-wearkitkat-releasekitkat-mr2.2-releasekitkat-mr2.1-releasekitkat-mr2-releasekitkat-mr1.1-releasekitkat-mr1-releasekitkat-devkitkat-cts-releasekitkat-cts-devjb-mr2.0.0-releasejb-mr2.0-releasejb-mr2-releasejb-mr2-devidea133-weekly-releaseidea133
Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d
Diffstat (limited to 'src/org/xbill/DNS/Serial.java')
-rw-r--r-- | src/org/xbill/DNS/Serial.java | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/org/xbill/DNS/Serial.java b/src/org/xbill/DNS/Serial.java new file mode 100644 index 0000000..3a146c6 --- /dev/null +++ b/src/org/xbill/DNS/Serial.java @@ -0,0 +1,61 @@ +// Copyright (c) 2003-2004 Brian Wellington (bwelling@xbill.org) + +package org.xbill.DNS; + +/** + * Helper functions for doing serial arithmetic. These should be used when + * setting/checking SOA serial numbers. SOA serial number arithmetic is + * defined in RFC 1982. + * + * @author Brian Wellington + */ + +public final class Serial { + +private static final long MAX32 = 0xFFFFFFFFL; + +private +Serial() { +} + +/** + * Compares two numbers using serial arithmetic. The numbers are assumed + * to be 32 bit unsigned integers stored in longs. + * @param serial1 The first integer + * @param serial2 The second integer + * @return 0 if the 2 numbers are equal, a positive number if serial1 is greater + * than serial2, and a negative number if serial2 is greater than serial1. + * @throws IllegalArgumentException serial1 or serial2 is out of range + */ +public static int +compare(long serial1, long serial2) { + if (serial1 < 0 || serial1 > MAX32) + throw new IllegalArgumentException(serial1 + " out of range"); + if (serial2 < 0 || serial2 > MAX32) + throw new IllegalArgumentException(serial2 + " out of range"); + long diff = serial1 - serial2; + if (diff >= MAX32) + diff -= (MAX32 + 1); + else if (diff < -MAX32) + diff += (MAX32 + 1); + return (int)diff; +} + +/** + * Increments a serial number. The number is assumed to be a 32 bit unsigned + * integer stored in a long. This basically adds 1 and resets the value to + * 0 if it is 2^32. + * @param serial The serial number + * @return The incremented serial number + * @throws IllegalArgumentException serial is out of range + */ +public static long +increment(long serial) { + if (serial < 0 || serial > MAX32) + throw new IllegalArgumentException(serial + " out of range"); + if (serial == MAX32) + return 0; + return serial + 1; +} + +} |