private final synchronized void initInternalBook() {
if (numBookMoves >= 0) return;
// long t0 = System.currentTimeMillis();
bookMap = new HashMap<Long, List<BookEntry>>();
numBookMoves = 0;
try {
InputStream inStream = getClass().getResourceAsStream("/book.bin");
if (inStream == null) throw new IOException();
List<Byte> buf = new ArrayList<Byte>(8192);
byte[] tmpBuf = new byte[1024];
while (true) {
int len = inStream.read(tmpBuf);
if (len <= 0) break;
for (int i = 0; i < len; i++) buf.add(tmpBuf[i]);
}
inStream.close();
Position startPos = TextIO.readFEN(TextIO.startPosFEN);
Position pos = new Position(startPos);
UndoInfo ui = new UndoInfo();
int len = buf.size();
for (int i = 0; i < len; i += 2) {
int b0 = buf.get(i);
if (b0 < 0) b0 += 256;
int b1 = buf.get(i + 1);
if (b1 < 0) b1 += 256;
int move = (b0 << 8) + b1;
if (move == 0) {
pos = new Position(startPos);
} else {
boolean bad = ((move >> 15) & 1) != 0;
int prom = (move >> 12) & 7;
Move m = new Move(move & 63, (move >> 6) & 63, promToPiece(prom, pos.whiteMove));
if (!bad) addToBook(pos, m);
pos.makeMove(m, ui);
}
}
} catch (ChessParseError ex) {
throw new RuntimeException();
} catch (IOException ex) {
System.out.println("Can't read opening book resource");
throw new RuntimeException();
}
/* {
long t1 = System.currentTimeMillis();
System.out.printf("Book moves:%d (parse time:%.3f)%n", numBookMoves,
(t1 - t0) / 1000.0);
} */
}
