/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* gos720 src/gos/2d/XTOP/contrib/programs/xditview/page.c 1.1            */
/*                                                                        */
/* Licensed Materials - Property of IBM                                   */
/*                                                                        */
/* COPYRIGHT International Business Machines Corp. 1996                   */
/* All Rights Reserved                                                    */
/*                                                                        */
/* US Government Users Restricted Rights - Use, duplication or            */
/* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.      */
/*                                                                        */
/* IBM_PROLOG_END_TAG                                                     */
/* SCCSID_BEGIN_TAG                                                    */
#ifndef lint
static char sccsid[] = "@(#)01  1.1  src/gos/2d/XTOP/contrib/programs/xditview/page.c, xsample, gos720 10/24/96 15:08:37";
#endif
/* SCCSID_END_TAG                                                      */
/* $XConsortium: page.c,v 1.5 91/07/26 00:40:20 keith 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"

#ifdef X_NOT_STDC_ENV
extern long	ftell();
#endif

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

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

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

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

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

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);
}

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

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

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);
}