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logic.c

/*  Sarien - A Sierra AGI resource interpreter engine
 *  Copyright (C) 1999,2001 Stuart George and Claudio Matsuoka
 *  
 *  $Id: logic.c,v 1.14 2002/01/01 12:23:32 cmatsuoka Exp $
 *
 *  This program 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; see docs/COPYING for further details.
 */

#include <stdio.h>
#include <string.h>
#include "sarien.h"
#include "agi.h"


/**
 * Decode logic resource
 * This function decodes messages from the specified raw logic resource
 * into a message list.
 * @param n  The number of the logic resource to decode.
 */
int decode_logic (int n)
{
      int ec = err_OK;
      int mstart, mend, mc;
      UINT8 *m0;

      /* decrypt messages at end of logic + build message list */

      /* report ("decoding logic #%d\n", n); */
      m0 = game.logics[n].data;

      mstart = lohi_getword (m0) + 2;
      mc = lohi_getbyte (m0 + mstart);
      mend = lohi_getword (m0 + mstart + 1);
      m0 += mstart + 3;             /* cover header info */
      mstart = mc << 1;

      /* if the logic was not compressed, decrypt the text messages
       * only if there are more than 0 messages
       */
      if ((~game.dir_logic[n].flags & RES_COMPRESSED) && mc > 0)
            decrypt (m0 + mstart, mend - mstart);     /* decrypt messages */

      /* build message list */
      m0 = game.logics[n].data;
      mstart = lohi_getword (m0) + 2;                 /* +2 covers pointer */
      game.logics[n].num_texts = lohi_getbyte (m0 + mstart);

      /* resetp logic pointers */
      game.logics[n].sIP = 2;
      game.logics[n].cIP = 2;
      game.logics[n].size = lohi_getword (m0) + 2; /* logic end pointer */

      /* allocate list of pointers to point into our data */
      game.logics[n].texts = calloc (1 + game.logics[n].num_texts,
            sizeof (char*));

      /* cover header info */
      m0 += mstart+3;

      if (game.logics[n].texts != NULL) {
            /* move list of strings into list to make real pointers */
            for(mc = 0; mc < game.logics[n].num_texts; mc++) {
                  mend = lohi_getword(m0+mc*2);
                  game.logics[n].texts[mc] = mend ?
                        (char *)m0 + mend - 2 : "";
            }
            /* set loaded flag now its all completly loaded */
            game.dir_logic[n].flags |= RES_LOADED;
      } else {
            /* unload data
             * blah DF YA WANKER!!@!@# frag. i'm so dumb. not every logic
             * has text
             */
            free (game.logics[n].data);
            ec = err_NotEnoughMemory;
      }

      return ec;
}


/**
 * Unload logic resource
 * This function unloads the specified logic resource, freeing any
 * memory chunks allocated for this resource.
 * @param n  The number of the logic resource to unload
 */
void unload_logic (int n)
{
      if (game.dir_logic[n].flags & RES_LOADED) {
            free (game.logics[n].data);
            if (game.logics[n].num_texts)
                  free (game.logics[n].texts);
            game.logics[n].num_texts = 0;
            game.dir_logic[n].flags &= ~RES_LOADED;
      }

      /* if cached, we end up here */
      game.logics[n].sIP = 2;
      game.logics[n].cIP = 2;
}

/* end: logic.c */


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