Subversion Repositories wimsdev

/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis

 *

 *  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; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program 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 program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

/* Check the zone of click in an image */

/* Return value: -1 if no condition is met.

 * n>0 for the line of condition meeting the click.

 * empty if condition has error. */

/***************** Nothing should need change hereafter *****************/

#include "../Lib/libwims.h"

#include <gd.h>

#define VLEN 1024

int clickx, clicky;

int prec;

double v[VLEN+2];

char namebuf[2048];

char oldfile[1024]="";

char filebase[10240];

gdImagePtr image=NULL;

int testcolor;

void fbase(void)

{

    char *p, *m, *p1, *p2;

    p=getenv("w_insdraw_filebase");

    m=getenv("module_dir"); if(m==NULL) m="";

    if(strncmp(m,"modules/",strlen("modules/"))!=0) {

      snprintf(filebase,sizeof(filebase),"gifs"); return;

    }

    if(p==NULL || *p==0) {

      if(strncmp(m,"modules/adm/",strlen("modules/adm"))==0)

        snprintf(filebase,sizeof(filebase),"%s/insdraw gifs",m);

      else

        snprintf(filebase,sizeof(filebase),"%s gifs",m);

      return;

    }

    for(p1=find_word_start(p); *p1; p1=find_word_start(p2)) {

      p2=find_word_end(p1); if(*p2) *p2++=0;

      if(strstr(p1,"..")!=NULL) continue;

      snprintf(filebase+strlen(filebase),

             sizeof(filebase)-strlen(filebase),

             " %s/%s",m,p1);

    }

    snprintf(filebase+strlen(filebase),

           sizeof(filebase)-strlen(filebase),

           " gifs");

}

/* File opening: with security */

FILE *open4read(char *n)

{

    char *p, *p1, *p2;

    int t;

    FILE *f;

    n=find_word_start(n);

    if(*n==0) return NULL;

    p=filebase;

    p1=n+strlen(n)-4;if(p1<n || strcasecmp(p1,".gif")!=0) t=1; else t=0;

    if(p!=NULL && *p!=0) {

      char pbuf[MAX_LINELEN+1];

      snprintf(pbuf,sizeof(pbuf),"%s",p);

      p=find_word_start(pbuf); if(strstr(p,"..")!=NULL) return NULL;

      if(*n=='/' || strstr(n,"..")!=NULL) return NULL;

/* prohibit unusual file/dir names */

      for(p1=p;*p1;p1++)

        if(!isalnum(*p1) && !isspace(*p1) && strchr("~_-/.",*p1)==NULL)

          return NULL;

      for(p1=n;*p1;p1++)

        if(!isalnum(*p1) && !isspace(*p1) && strchr("~_-/.",*p1)==NULL)

          return NULL;

      f=NULL;

      for(p1=p; *p1; p1=find_word_start(p2)) {

          if(*p1=='/') return NULL;

          p2=find_word_end(p1);

          if(*p2) *p2++=0;

          snprintf(namebuf,sizeof(namebuf),"%s/%s",p1,n);

          f=fopen(namebuf,"r"); if(f!=NULL) goto imgtype;

      }

      p1=getenv("w_wims_session");

      if(p1!=NULL && strstr(p1,"..")==NULL && strncmp(n,"insert",6)==0) {

          snprintf(namebuf,sizeof(namebuf),"../s2/%s/%s",p1,n);

          f=fopen(namebuf,"r");

      }

    }

    else {

      snprintf(namebuf,sizeof(namebuf),"%s",n);

      f=fopen(namebuf,"r");

    }

    imgtype:

    if(t && f!=NULL) {

      char tbuf[1024],sbuf[4096];

      fclose(f); f=NULL;

      p1=getenv("TMPDIR"); if(p1==NULL || *p1==0) p1=".";

      snprintf(tbuf,sizeof(tbuf),"%s/drawfile_.gif",p1);

      snprintf(sbuf,sizeof(sbuf),"convert %s %s",namebuf,tbuf);

      if (system(sbuf)) fprintf(stderr,"system failed");

        f=fopen(tbuf,"r");

    }

    if(f!=NULL) snprintf(oldfile,sizeof(oldfile),"%s",n);

    return f;

}

int getvalue(char *p, int n)

{

    int t;

    char *p1;

    if(n<0) n=VLEN;

    for(t=0; t<n; t++,p=p1) {

      p1=find_item_end(p); if(*p1) *p1++=0;

      p=find_word_start(p);

      if(*p==0) break;

      v[t]=strevalue(p);

      if(!finite(v[t])) exit(-1);

    }

    return t;

}

/* test one condition. Returns 1 if met. */

int test(char *p)

{

    char *p1;

    int i,t;

    double d;

    p=find_word_start(p); p1=find_item_end(p);

    if(*p1) *p1++=0; else exit(-1);

    prec=0;

    *p=tolower(*p);

    if(strncasecmp(p,"polygon",3)==0 || *p=='g') {

      int cross;

      double x0,y0,a1,b1,c1,a2,b2,c2,s1,s2,s3,s4;

      t=getvalue(p1,-1); if(t<6) exit(-1);

      cross=0; x0=-19; y0=-19;

      a1=clicky-y0;b1=x0-clickx;c1=clickx*y0-x0*clicky;

      v[t]=v[0];v[t+1]=v[1];

      for(i=2;i<t+2;i+=2) {

          a2=v[i+1]-v[i-1];b2=v[i-2]-v[i];

          c2=v[i]*v[i-1]-v[i-2]*v[i+1];

          s1=a1*v[i-2]+b1*v[i-1]+c1;

          s2=a1*v[i]+b1*v[i+1]+c1;

          s3=a2*x0+b2*y0+c2;

          s4=a2*clickx+b2*clicky+c2;

          if(s1==0) continue;

          if(s1*s2<=0 && s3*s4<=0) cross++;

      }

      return cross&1;

    }

    if(*p=='p' || strncasecmp(p,"point",3)==0) {

      t=getvalue(p1,-1); if(t<2) exit(-1);

      for(i=0;i<t;i+=2) {

          d=sqrt(pow(v[i]-clickx,2)+pow(v[i+1]-clicky,2));

          if(d<=4) return 1;

          if(d<=7) {prec=1; return 1;}

      }

      return 0;

    }

    if(strncasecmp(p,"rectangle",1)==0) {

      double x1,x2,y1,y2;

      if(getvalue(p1,4)!=4) exit(-1);

      x1=min(v[0],v[2]); x2=max(v[0],v[2]);

      y1=min(v[1],v[3]); y2=max(v[1],v[3]);

      if(clickx<x1 || clickx>x2 || clicky<y1 || clicky>y2) return 0;

      else return 1;

    }

    if(strncasecmp(p,"circle",1)==0) {

      double dist;

      if(getvalue(p1,3)!=3 || v[2]<0) exit(-1);

      dist=sqrt(pow(v[0]-clickx,2)+pow(v[1]-clicky,2));

      if(dist>v[2]/2) return 0; else return 1;

    }

    if(strncasecmp(p,"ellipse",1)==0) {

      double dist;

      if(getvalue(p1,4)!=4) exit(-1);

      if(v[2]<=0 || v[3]<=0) exit(-1);

      dist=sqrt(pow(2*(v[0]-clickx)/v[2],2)+pow(2*(v[1]-clicky)/v[3],2));

      if(dist>1) return 0; else return 1;

      return 0;

    }

    if(strncasecmp(p,"bound",1)==0) {

      char *p2;

      FILE *f;

      int c, T;

      p2=find_item_end(p1); if(*p2) *p2++=0;

      T=getvalue(p2,2); if(T!=2 && T!=0) exit(-1);

      p1=find_word_start(p1); *find_word_end(p1)=0;

      if(*p1==0) exit(-1);

      if(strcmp(p1,oldfile)!=0) {

          if(image) gdImageDestroy(image);

          f=open4read(p1); if(f==NULL) exit(-1);

          image=gdImageCreateFromGif(f); fclose(f);

          if(T==0) {

            testcolor=gdImageGetPixel(image,1,1);

          }

          else {

            testcolor=gdImageColorAllocate(image,2,3,5);

            gdImageFill(image,clickx,clicky,testcolor);

          }

      }

      if(T==0) {

          c=gdImageGetPixel(image,clickx,clicky);

          if(c!=testcolor) return 1;

      }

      else {

          c=gdImageGetPixel(image,v[0],v[1]);

          if(c==testcolor) return 1;

      }

      return 0;

    }

    exit(-1);

}

int oneline(char *p)

{

    char *p1, *p2;

    int t, rev;

    if(strparchr(p,'|')!=NULL) {

      t=0; for(p1=p;p1;p1=p2) {

          p2=strparchr(p1,'|'); if(p2!=NULL) *p2++=0;

          t|=oneline(p1);

      }

      return t;

    }

    if(strparchr(p,'&')!=NULL) {

      t=1; for(p1=p;p1;p1=p2) {

          p2=strparchr(p1,'&'); if(p2!=NULL) *p2++=0;

          t&=oneline(p1);

      }

      return t;

    }

    p1=find_word_start(p); rev=0;

    if(*p1=='^') {

      rev=1; p1=find_word_start(++p1);

    }

    if(*p1==0) return rev^1;

    if(*p1=='(') {

      p1++; p2=find_matching(p1,')');

      if(p2==NULL) exit(-1);

      *p2=0; return oneline(p1)^rev;

    }

    return test(p1)^rev;

}

/* Returns the number of line matching the click coordinates */

int main()

{

    char *p, *p2, *p3;

    int i,j;

    fbase();

    p=getenv("wims_exec_parm"); if(p==NULL || *p==0) return -1;

    p=find_word_start(p); p2=strchr(p,'\n');

    if(p2==NULL) p2=p+strlen(p); else *p2++=0;

    p3=strchr(p,','); if(p3==NULL) return -1; else *p3++=0;

    clickx=atoi(p); clicky=atoi(p3);

    for(i=1,p=find_word_start(p2);*p;i++, p=find_word_start(p2)) {

      fprintf(stderr,"Line %d.\n",i);

      p2=strchr(p,'\n'); if(p2==NULL) p2=p+strlen(p); else *p2++=0;

      if(*p==0) continue;

      j=oneline(p);

      if(j) {printf("%d %d",i,prec); return 0;}

    }

    printf("-1"); return 0;

}