Line data    Source code

       1             : /*
       2             :  * Copyright (c) 1988-1997 Sam Leffler
       3             :  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
       4             :  *
       5             :  * Permission to use, copy, modify, distribute, and sell this software and
       6             :  * its documentation for any purpose is hereby granted without fee, provided
       7             :  * that (i) the above copyright notices and this permission notice appear in
       8             :  * all copies of the software and related documentation, and (ii) the names of
       9             :  * Sam Leffler and Silicon Graphics may not be used in any advertising or
      10             :  * publicity relating to the software without the specific, prior written
      11             :  * permission of Sam Leffler and Silicon Graphics.
      12             :  *
      13             :  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
      14             :  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
      15             :  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
      16             :  *
      17             :  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
      18             :  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
      19             :  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
      20             :  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
      21             :  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
      22             :  * OF THIS SOFTWARE.
      23             :  */
      24             : 
      25             : /*
      26             :  * TIFF Library.
      27             :  */
      28             : #include "tiffiop.h"
      29             : 
      30       52856 : int TIFFFlush(TIFF *tif)
      31             : {
      32       52856 :     if (tif->tif_mode == O_RDONLY)
      33           0 :         return 1;
      34             : 
      35       52856 :     if (!TIFFFlushData(tif))
      36          12 :         return (0);
      37             : 
      38             :     /* In update (r+) mode we try to detect the case where
      39             :        only the strip/tile map has been altered, and we try to
      40             :        rewrite only that portion of the directory without
      41             :        making any other changes */
      42             : 
      43       52842 :     if ((tif->tif_flags & TIFF_DIRTYSTRIP) &&
      44       34592 :         !(tif->tif_flags & TIFF_DIRTYDIRECT) && tif->tif_mode == O_RDWR)
      45             :     {
      46        7530 :         if (TIFFForceStrileArrayWriting(tif))
      47        7530 :             return 1;
      48             :     }
      49             : 
      50       72404 :     if ((tif->tif_flags & (TIFF_DIRTYDIRECT | TIFF_DIRTYSTRIP)) &&
      51       27091 :         !TIFFRewriteDirectory(tif))
      52          20 :         return (0);
      53             : 
      54       45293 :     return (1);
      55             : }
      56             : 
      57             : /*
      58             :  * This is an advanced writing function that must be used in a particular
      59             :  * sequence, and together with TIFFDeferStrileArrayWriting(),
      60             :  * to make its intended effect. Its aim is to force the writing of
      61             :  * the [Strip/Tile][Offsets/ByteCounts] arrays at the end of the file, when
      62             :  * they have not yet been rewritten.
      63             :  *
      64             :  * The typical sequence of calls is:
      65             :  * TIFFOpen()
      66             :  * [ TIFFCreateDirectory(tif) ]
      67             :  * Set fields with calls to TIFFSetField(tif, ...)
      68             :  * TIFFDeferStrileArrayWriting(tif)
      69             :  * TIFFWriteCheck(tif, ...)
      70             :  * TIFFWriteDirectory(tif)
      71             :  * ... potentially create other directories and come back to the above directory
      72             :  * TIFFForceStrileArrayWriting(tif)
      73             :  *
      74             :  * Returns 1 in case of success, 0 otherwise.
      75             :  */
      76        7853 : int TIFFForceStrileArrayWriting(TIFF *tif)
      77             : {
      78             :     static const char module[] = "TIFFForceStrileArrayWriting";
      79        7853 :     const int isTiled = TIFFIsTiled(tif);
      80             : 
      81        7853 :     if (tif->tif_mode == O_RDONLY)
      82             :     {
      83           0 :         TIFFErrorExtR(tif, tif->tif_name, "File opened in read-only mode");
      84           0 :         return 0;
      85             :     }
      86        7853 :     if (tif->tif_diroff == 0)
      87             :     {
      88           0 :         TIFFErrorExtR(tif, module, "Directory has not yet been written");
      89           0 :         return 0;
      90             :     }
      91        7853 :     if ((tif->tif_flags & TIFF_DIRTYDIRECT) != 0)
      92             :     {
      93           0 :         TIFFErrorExtR(tif, module,
      94             :                       "Directory has changes other than the strile arrays. "
      95             :                       "TIFFRewriteDirectory() should be called instead");
      96           0 :         return 0;
      97             :     }
      98             : 
      99        7853 :     if (!(tif->tif_flags & TIFF_DIRTYSTRIP))
     100             :     {
     101         323 :         if (!(tif->tif_dir.td_stripoffset_entry.tdir_tag != 0 &&
     102         323 :               tif->tif_dir.td_stripoffset_entry.tdir_count == 0 &&
     103         323 :               tif->tif_dir.td_stripoffset_entry.tdir_type == 0 &&
     104         323 :               tif->tif_dir.td_stripoffset_entry.tdir_offset.toff_long8 == 0 &&
     105         323 :               tif->tif_dir.td_stripbytecount_entry.tdir_tag != 0 &&
     106         323 :               tif->tif_dir.td_stripbytecount_entry.tdir_count == 0 &&
     107         323 :               tif->tif_dir.td_stripbytecount_entry.tdir_type == 0 &&
     108         323 :               tif->tif_dir.td_stripbytecount_entry.tdir_offset.toff_long8 == 0))
     109             :         {
     110           0 :             TIFFErrorExtR(tif, module,
     111             :                           "Function not called together with "
     112             :                           "TIFFDeferStrileArrayWriting()");
     113           0 :             return 0;
     114             :         }
     115             : 
     116         323 :         if (tif->tif_dir.td_stripoffset_p == NULL && !TIFFSetupStrips(tif))
     117           0 :             return 0;
     118             :     }
     119             : 
     120        7853 :     if (_TIFFRewriteField(tif,
     121             :                           isTiled ? TIFFTAG_TILEOFFSETS : TIFFTAG_STRIPOFFSETS,
     122        7853 :                           TIFF_LONG8, tif->tif_dir.td_nstrips,
     123       15706 :                           tif->tif_dir.td_stripoffset_p) &&
     124        7853 :         _TIFFRewriteField(
     125             :             tif, isTiled ? TIFFTAG_TILEBYTECOUNTS : TIFFTAG_STRIPBYTECOUNTS,
     126        7853 :             TIFF_LONG8, tif->tif_dir.td_nstrips,
     127        7853 :             tif->tif_dir.td_stripbytecount_p))
     128             :     {
     129        7853 :         tif->tif_flags &= ~TIFF_DIRTYSTRIP;
     130        7853 :         tif->tif_flags &= ~TIFF_BEENWRITING;
     131        7853 :         return 1;
     132             :     }
     133             : 
     134           0 :     return 0;
     135             : }
     136             : 
     137             : /*
     138             :  * Flush buffered data to the file.
     139             :  *
     140             :  * Frank Warmerdam'2000: I modified this to return 1 if TIFF_BEENWRITING
     141             :  * is not set, so that TIFFFlush() will proceed to write out the directory.
     142             :  * The documentation says returning 1 is an error indicator, but not having
     143             :  * been writing isn't exactly a an error.  Hopefully this doesn't cause
     144             :  * problems for other people.
     145             :  */
     146       52878 : int TIFFFlushData(TIFF *tif)
     147             : {
     148       52878 :     if ((tif->tif_flags & TIFF_BEENWRITING) == 0)
     149       18044 :         return (1);
     150       34834 :     if (tif->tif_flags & TIFF_POSTENCODE)
     151             :     {
     152          11 :         tif->tif_flags &= ~TIFF_POSTENCODE;
     153          11 :         if (!(*tif->tif_postencode)(tif))
     154           0 :             return (0);
     155             :     }
     156       34834 :     return (TIFFFlushData1(tif));
     157             : }