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page.c

/* $XConsortium: page.c,v 1.5 91/07/26 00:40:20 keith Exp $ */
/* $XFree86: xc/programs/xditview/page.c,v 1.3 2001/08/01 00:45:03 tsi Exp $ */

/*
 * page.c
 *
 * map page numbers to file position
 */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <X11/Xos.h>
#include <stdio.h>
#include <ctype.h>
#include "DviP.h"

static DviFileMap *
MapPageNumberToFileMap (DviWidget dw, int number)
{
      DviFileMap  *m;

      for (m = dw->dvi.file_map; m; m=m->next)
            if (m->page_number == number)
                  break;
      return m;
}

void
DestroyFileMap (m)
      DviFileMap  *m;
{
      DviFileMap  *next;

      for (; m; m = next) {
            next = m->next;
            XtFree ((char *) m);
      }
}

void
ForgetPagePositions (dw)
      DviWidget   dw;
{
      DestroyFileMap (dw->dvi.file_map);
      dw->dvi.file_map = 0;
}

void
RememberPagePosition(dw, number)
      DviWidget   dw;
      int         number;
{
      DviFileMap  *m;

      if (!(m = MapPageNumberToFileMap (dw, number))) {
            m = (DviFileMap *) XtMalloc (sizeof *m);
            m->page_number = number;
            m->next = dw->dvi.file_map;
            dw->dvi.file_map = m;
      }
      if (dw->dvi.tmpFile)
            m->position = ftell (dw->dvi.tmpFile);
      else
            m->position = ftell (dw->dvi.file);
}

long
SearchPagePosition (dw, number)
      DviWidget   dw;
      int         number;
{
      DviFileMap  *m;

      if (!(m = MapPageNumberToFileMap (dw, number)))
            return -1;
      return m->position;
}

void
FileSeek(dw, position)
DviWidget   dw;
long        position;
{
      if (dw->dvi.tmpFile) {
            dw->dvi.readingTmp = 1;
            fseek (dw->dvi.tmpFile, position, 0);
      } else
            fseek (dw->dvi.file, position, 0);
}


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