src/tiff/libtiff/tif_flush.c

   1 /* $Id$ */
   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  */