tif_flush.c

/* $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));
}

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