package railo.commons.digest;
public class HashUtil {
private static final long[] byteTable = createLookupTable();
private static final long HSTART = 0xBB40E64DA205B064L;
private static final long HMULT = 7664345821815920749L;
public static long create64BitHash(CharSequence cs) {
long h = HSTART;
final long hmult = HMULT;
final long[] ht = byteTable;
final int len = cs.length();
for (int i = 0; i < len; i++) {
char ch = cs.charAt(i);
h = (h * hmult) ^ ht[ch & 0xff];
h = (h * hmult) ^ ht[(ch >>> 8) & 0xff];
}
return h;
}
public static String create64BitHashAsString(CharSequence cs, int radix) {
return Long.toString(create64BitHash(cs), radix);
}
private static final long[] createLookupTable() {
long[] _byteTable = new long[256];
long h = 0x544B2FBACAAF1684L;
for (int i = 0; i < 256; i++) {
for (int j = 0; j < 31; j++) {
h = (h >>> 7) ^ h;
h = (h << 11) ^ h;
h = (h >>> 10) ^ h;
}
_byteTable[i] = h;
}
return _byteTable;
}
}