public boolean matches(byte[] candidate) {
if (value.length != candidate.length) {
return false;
}
return !BitMap.hasAnyBitSet(BitMap.xor(value, BitMap.and(candidate, mask)));
}
public void validateMask() throws AclFormatException {
if (BitMap.hasAnyBitSet(BitMap.and(value, BitMap.not(mask)))) {
throw new AclFormatException(
"The base address '"
+ ServerAcl.dottedNotation(value)
+ "' is too specific for block-size-spec /"
+ bitBlockSize);
}
}
public AclEntry(byte[] value, int bitBlockSize, boolean allow) throws AclFormatException {
byte[] allOn = null;
switch (value.length) {
case 4:
allOn = ALL_SET_4BYTES;
break;
case 16:
allOn = ALL_SET_16BYTES;
break;
default:
throw new IllegalArgumentException("Only 4 and 16 bytes supported, not " + value.length);
}
if (bitBlockSize > value.length * 8) {
throw new IllegalArgumentException(
"Specified "
+ bitBlockSize
+ " significant bits, but value only has "
+ (value.length * 8)
+ " bits");
}
this.bitBlockSize = bitBlockSize;
this.value = value;
mask = BitMap.leftShift(allOn, value.length * 8 - bitBlockSize);
if (mask.length != value.length) {
throw new RuntimeException(
"Basic program assertion failed. "
+ "Generated mask length "
+ mask.length
+ " (bytes) does not match given value length "
+ value.length
+ " (bytes).");
}
this.allow = allow;
validateMask();
}