// New rng from existing rng
public Sha1Generator(final Sha1Generator parent, final int spawnnumber) {
final byte[] seedstate = new byte[4];
seedstate[0] = (byte) (LOWBYTE & (spawnnumber >>> 24));
seedstate[1] = (byte) (LOWBYTE & (spawnnumber >>> 16));
seedstate[2] = (byte) (LOWBYTE & (spawnnumber >>> 8));
seedstate[3] = (byte) (LOWBYTE & (spawnnumber));
final Sha1Compiler sha1 = new Sha1Compiler();
sha1.hash(parent.state, 20);
sha1.hash(seedstate, 4);
sha1.digest(state);
}
// Return next random number
public final int nextrand() {
int d;
final Sha1Compiler sha1 = new Sha1Compiler();
sha1.hash(state, 20);
sha1.digest(state);
return POS_MASK
& (((LOWBYTE & (int) state[16]) << 24)
| ((LOWBYTE & (int) state[17]) << 16)
| ((LOWBYTE & (int) state[18]) << 8)
| ((LOWBYTE & (int) state[19])));
}
// new rng from seed
public Sha1Generator(final int seedarg) {
final byte[] seedstate = new byte[20];
for (int i = 0; i < 16; i++) {
seedstate[i] = 0;
}
seedstate[16] = (byte) (LOWBYTE & (seedarg >>> 24));
seedstate[17] = (byte) (LOWBYTE & (seedarg >>> 16));
seedstate[18] = (byte) (LOWBYTE & (seedarg >>> 8));
seedstate[19] = (byte) (LOWBYTE & (seedarg));
final Sha1Compiler sha1 = new Sha1Compiler();
sha1.hash(seedstate, 20);
sha1.digest(state);
}
