File: evx.c

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/*
 *  Copyright 2006 Michael Maurer <mjmaurer@yahoo.com>, 
 *                 Brian Goetz <brian@quiotix.com>, 
 *                 Loic Dachary <loic@dachary.org>, 
 *                 Tim Showalter <tjs@psaux.com>
 *
 *  This package is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 dated June, 1991.
 *
 *  This package is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this package; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */
#include <assert.h>

#include "poker_defs.h"
#include "evx_defs.h"


static int8 find_and_clear(uint32 *cardsp) {
  int8 retval;
  uint32 mask;
  
  for (mask = 1 << StdDeck_Rank_ACE, retval = StdDeck_Rank_ACE; 
       mask && !(*cardsp & mask);
       --retval, mask >>= 1)
    ;
  if (mask)
    *cardsp &= ~mask;
  return retval;
}

static uint8 next_card(uint32 *ms_cardsp, uint32 *ls_cardsp)
{
  int8 retval;

  retval = find_and_clear(ms_cardsp);
  if (retval == -1)
    retval = find_and_clear(ls_cardsp);
  return retval == -1 ? 0 : retval;
}


HandVal 
EvxHandVal_toHandVal(EvxHandVal ehv) {
  uint32 ls_cards, ms_cards, cards;
  int i;

  ms_cards = (ehv >> EvxHandVal_SIGCARDS_SHIFT) & EvxHandVal_RANK_MASK;
  ls_cards =  ehv & EvxHandVal_RANK_MASK;
  cards = 0;

  for (i=0; i<5; i++) 
    cards = (cards << HandVal_CARD_WIDTH) 
      + next_card(&ms_cards, &ls_cards);

  return HandVal_HANDTYPE_VALUE(EvxHandVal_HANDTYPE(ehv)) + cards;
}