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Make bit-twiddling code more readable.

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akwizgran
2020-02-19 09:52:13 +00:00
parent b3d4012527
commit 61db5d1b04
1 changed files with 5 additions and 2 deletions
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7
bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
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@@ -241,9 +241,12 @@ class LanTcpPlugin extends TcpPlugin {
static boolean areAddressesInSameNetwork(byte[] localIp, byte[] remoteIp, static boolean areAddressesInSameNetwork(byte[] localIp, byte[] remoteIp,
int prefixLength) { int prefixLength) {
if (localIp.length != remoteIp.length) return false; if (localIp.length != remoteIp.length) return false;
// Compare the first prefixLength bits of the addresses
for (int i = 0; i < prefixLength; i++) { for (int i = 0; i < prefixLength; i++) {
int mask = 128 >> (i & 7); int byteIndex = i >> 3;
if ((localIp[i >> 3] & mask) != (remoteIp[i >> 3] & mask)) { int bitIndex = i & 7; // 0 to 7
int mask = 128 >> bitIndex; // Select the bit at bitIndex
if ((localIp[byteIndex] & mask) != (remoteIp[byteIndex] & mask)) {
return false; // Addresses differ at bit i return false; // Addresses differ at bit i
} }
} }