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Improved unsigned byte comparison

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This commit is contained in:
Christian Basler 2016-06-12 20:43:23 +02:00
parent 12fb794203
commit 62d40fb2c3
1 changed files with 3 additions and 5 deletions
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8
core/src/main/java/ch/dissem/bitmessage/utils/Bytes.java
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@ -23,6 +23,8 @@ package ch.dissem.bitmessage.utils;
* situations. * situations.
*/ */
public class Bytes { public class Bytes {
public static final byte BYTE_0x80 = (byte) 0x80;
public static void inc(byte[] nonce) { public static void inc(byte[] nonce) {
for (int i = nonce.length - 1; i >= 0; i--) { for (int i = nonce.length - 1; i >= 0; i--) {
nonce[i]++; nonce[i]++;
@ -82,11 +84,7 @@ public class Bytes {
} }
private static boolean lt(byte a, byte b) { private static boolean lt(byte a, byte b) {
if (a < 0) return b < 0 && a < b; return (a ^ BYTE_0x80) < (b ^ BYTE_0x80);
if (b < 0) return a >= 0 || a < b;
return a < b;
// This would be easier to understand, but is (slightly) slower:
// return (a & 0xff) < (b & 0xff);
} }
/** /**