public void set(int flags) {
if (!ignoreFlags) {
if (isReversed) flags = EngUtil.reverseFlags(flags);
// castling privileges
if (!EngUtil.canCastle(flags, WHITE_KINGS_CASTLING)) theValue ^= castle_random_w[0];
if (!EngUtil.canCastle(flags, WHITE_QUEENS_CASTLING)) theValue ^= castle_random_w[1];
if (!EngUtil.canCastle(flags, BLACK_KINGS_CASTLING)) theValue ^= castle_random_b[0];
if (!EngUtil.canCastle(flags, BLACK_QUEENS_CASTLING)) theValue ^= castle_random_b[1];
boolean whiteToMove = (flags & WHITE) != 0;
// en-passant target square
int epFile = EngUtil.enPassantFile(flags);
if (epFile != 0) {
int epSquare;
if (whiteToMove) epSquare = EngUtil.square(epFile, ROW_6);
else epSquare = EngUtil.square(epFile, ROW_3);
theValue ^= enpassant_random[square64(epSquare)];
}
// color to move
if (EngUtil.allOf(flags, WHITE)) theValue ^= wtm_random[0];
else if (EngUtil.allOf(flags, BLACK)) theValue ^= wtm_random[1];
else /* this branch is used when computing hash keys for look up in the crafty book.
there is no turn color. */ ;
}
}
