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      1 /* $Id: tif_flush.c,v 1.9 2010-03-31 06:40:10 fwarmerdam Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988-1997 Sam Leffler
      5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
      6  *
      7  * Permission to use, copy, modify, distribute, and sell this software and
      8  * its documentation for any purpose is hereby granted without fee, provided
      9  * that (i) the above copyright notices and this permission notice appear in
     10  * all copies of the software and related documentation, and (ii) the names of
     11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
     12  * publicity relating to the software without the specific, prior written
     13  * permission of Sam Leffler and Silicon Graphics.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
     16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
     17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
     18  *
     19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
     20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
     21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
     22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
     23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
     24  * OF THIS SOFTWARE.
     25  */
     26 
     27 /*
     28  * TIFF Library.
     29  */
     30 #include "tiffiop.h"
     31 
     32 int
     33 TIFFFlush(TIFF* tif)
     34 {
     35     if( tif->tif_mode == O_RDONLY )
     36         return 1;
     37 
     38     if (!TIFFFlushData(tif))
     39         return (0);
     40 
     41     /* In update (r+) mode we try to detect the case where
     42        only the strip/tile map has been altered, and we try to
     43        rewrite only that portion of the directory without
     44        making any other changes */
     45 
     46     if( (tif->tif_flags & TIFF_DIRTYSTRIP)
     47         && !(tif->tif_flags & TIFF_DIRTYDIRECT)
     48         && tif->tif_mode == O_RDWR )
     49     {
     50         uint64  *offsets=NULL, *sizes=NULL;
     51 
     52         if( TIFFIsTiled(tif) )
     53         {
     54             if( TIFFGetField( tif, TIFFTAG_TILEOFFSETS, &offsets )
     55                 && TIFFGetField( tif, TIFFTAG_TILEBYTECOUNTS, &sizes )
     56                 && _TIFFRewriteField( tif, TIFFTAG_TILEOFFSETS, TIFF_LONG8,
     57                                       tif->tif_dir.td_nstrips, offsets )
     58                 && _TIFFRewriteField( tif, TIFFTAG_TILEBYTECOUNTS, TIFF_LONG8,
     59                                       tif->tif_dir.td_nstrips, sizes ) )
     60             {
     61                 tif->tif_flags &= ~TIFF_DIRTYSTRIP;
     62                 tif->tif_flags &= ~TIFF_BEENWRITING;
     63                 return 1;
     64             }
     65         }
     66         else
     67         {
     68             if( TIFFGetField( tif, TIFFTAG_STRIPOFFSETS, &offsets )
     69                 && TIFFGetField( tif, TIFFTAG_STRIPBYTECOUNTS, &sizes )
     70                 && _TIFFRewriteField( tif, TIFFTAG_STRIPOFFSETS, TIFF_LONG8,
     71                                       tif->tif_dir.td_nstrips, offsets )
     72                 && _TIFFRewriteField( tif, TIFFTAG_STRIPBYTECOUNTS, TIFF_LONG8,
     73                                       tif->tif_dir.td_nstrips, sizes ) )
     74             {
     75                 tif->tif_flags &= ~TIFF_DIRTYSTRIP;
     76                 tif->tif_flags &= ~TIFF_BEENWRITING;
     77                 return 1;
     78             }
     79         }
     80     }
     81 
     82     if ((tif->tif_flags & (TIFF_DIRTYDIRECT|TIFF_DIRTYSTRIP))
     83         && !TIFFRewriteDirectory(tif))
     84         return (0);
     85 
     86     return (1);
     87 }
     88 
     89 /*
     90  * Flush buffered data to the file.
     91  *
     92  * Frank Warmerdam'2000: I modified this to return 1 if TIFF_BEENWRITING
     93  * is not set, so that TIFFFlush() will proceed to write out the directory.
     94  * The documentation says returning 1 is an error indicator, but not having
     95  * been writing isn't exactly a an error.  Hopefully this doesn't cause
     96  * problems for other people.
     97  */
     98 int
     99 TIFFFlushData(TIFF* tif)
    100 {
    101 	if ((tif->tif_flags & TIFF_BEENWRITING) == 0)
    102 		return (1);
    103 	if (tif->tif_flags & TIFF_POSTENCODE) {
    104 		tif->tif_flags &= ~TIFF_POSTENCODE;
    105 		if (!(*tif->tif_postencode)(tif))
    106 			return (0);
    107 	}
    108 	return (TIFFFlushData1(tif));
    109 }
    110 
    111 /* vim: set ts=8 sts=8 sw=8 noet: */
    112 /*
    113  * Local Variables:
    114  * mode: c
    115  * c-basic-offset: 8
    116  * fill-column: 78
    117  * End:
    118  */
    119