/* $Id: tif_flush.c,v 1.9 2010-03-31 06:40:10 fwarmerdam Exp $ */

/*

 * Copyright (c) 1988-1997 Sam Leffler

 * Copyright (c) 1991-1997 Silicon Graphics, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and 

 * its documentation for any purpose is hereby granted without fee, provided

 * that (i) the above copyright notices and this permission notice appear in

 * all copies of the software and related documentation, and (ii) the names of

 * Sam Leffler and Silicon Graphics may not be used in any advertising or

 * publicity relating to the software without the specific, prior written

 * permission of Sam Leffler and Silicon Graphics.

 * 

 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

 * 

 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

 * OF THIS SOFTWARE.

 */

/*

 * TIFF Library.

 */

#include "tiffiop.h"

int

TIFFFlush(TIFF* tif)

{

    if( tif->tif_mode == O_RDONLY )

        return 1;

    if (!TIFFFlushData(tif))

        return (0);

    /* In update (r+) mode we try to detect the case where 

       only the strip/tile map has been altered, and we try to 

       rewrite only that portion of the directory without 

       making any other changes */

    if( (tif->tif_flags & TIFF_DIRTYSTRIP)

        && !(tif->tif_flags & TIFF_DIRTYDIRECT) 

        && tif->tif_mode == O_RDWR )

    {

        uint64  *offsets=NULL, *sizes=NULL;

        if( TIFFIsTiled(tif) )

        {

            if( TIFFGetField( tif, TIFFTAG_TILEOFFSETS, &offsets ) 

                && TIFFGetField( tif, TIFFTAG_TILEBYTECOUNTS, &sizes ) 

                && _TIFFRewriteField( tif, TIFFTAG_TILEOFFSETS, TIFF_LONG8, 

                                      tif->tif_dir.td_nstrips, offsets )

                && _TIFFRewriteField( tif, TIFFTAG_TILEBYTECOUNTS, TIFF_LONG8, 

                                      tif->tif_dir.td_nstrips, sizes ) )

            {

                tif->tif_flags &= ~TIFF_DIRTYSTRIP;

                tif->tif_flags &= ~TIFF_BEENWRITING;

                return 1;

            }

        }

        else

        {

            if( TIFFGetField( tif, TIFFTAG_STRIPOFFSETS, &offsets ) 

                && TIFFGetField( tif, TIFFTAG_STRIPBYTECOUNTS, &sizes ) 

                && _TIFFRewriteField( tif, TIFFTAG_STRIPOFFSETS, TIFF_LONG8, 

                                      tif->tif_dir.td_nstrips, offsets )

                && _TIFFRewriteField( tif, TIFFTAG_STRIPBYTECOUNTS, TIFF_LONG8, 

                                      tif->tif_dir.td_nstrips, sizes ) )

            {

                tif->tif_flags &= ~TIFF_DIRTYSTRIP;

                tif->tif_flags &= ~TIFF_BEENWRITING;

                return 1;

            }

        }

    }

    if ((tif->tif_flags & (TIFF_DIRTYDIRECT|TIFF_DIRTYSTRIP)) 

        && !TIFFRewriteDirectory(tif))

        return (0);

    return (1);

}

/*

 * Flush buffered data to the file.

 *

 * Frank Warmerdam'2000: I modified this to return 1 if TIFF_BEENWRITING

 * is not set, so that TIFFFlush() will proceed to write out the directory.

 * The documentation says returning 1 is an error indicator, but not having

 * been writing isn't exactly a an error.  Hopefully this doesn't cause

 * problems for other people. 

 */

int

TIFFFlushData(TIFF* tif)

{

	if ((tif->tif_flags & TIFF_BEENWRITING) == 0)

		return (1);

	if (tif->tif_flags & TIFF_POSTENCODE) {

		tif->tif_flags &= ~TIFF_POSTENCODE;

		if (!(*tif->tif_postencode)(tif))

			return (0);

	}

	return (TIFFFlushData1(tif));

}

/* vim: set ts=8 sts=8 sw=8 noet: */

/*

 * Local Variables:

 * mode: c

 * c-basic-offset: 8

 * fill-column: 78

 * End:

 */