src/tiff/libtiff/tif_flush.c

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