Logo Search packages:      
Sourcecode: qt4-x11 version File versions  Download package

tif_write.c

/* $Id: tif_write.c,v 1.21 2006/02/27 14:29:20 dron 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.
 *
 * Scanline-oriented Write Support
 */
#include "tiffiop.h"
#include <stdio.h>

#define     STRIPINCR   20          /* expansion factor on strip array */

#define     WRITECHECKSTRIPS(tif, module)                   \
      (((tif)->tif_flags&TIFF_BEENWRITING) || TIFFWriteCheck((tif),0,module))
#define     WRITECHECKTILES(tif, module)                    \
      (((tif)->tif_flags&TIFF_BEENWRITING) || TIFFWriteCheck((tif),1,module))
#define     BUFFERCHECK(tif)                          \
      ((((tif)->tif_flags & TIFF_BUFFERSETUP) && tif->tif_rawdata) ||   \
          TIFFWriteBufferSetup((tif), NULL, (tsize_t) -1))

static      int TIFFGrowStrips(TIFF*, int, const char*);
static      int TIFFAppendToStrip(TIFF*, tstrip_t, tidata_t, tsize_t);

int
TIFFWriteScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t sample)
{
      static const char module[] = "TIFFWriteScanline";
      register TIFFDirectory *td;
      int status, imagegrew = 0;
      tstrip_t strip;

      if (!WRITECHECKSTRIPS(tif, module))
            return (-1);
      /*
       * Handle delayed allocation of data buffer.  This
       * permits it to be sized more intelligently (using
       * directory information).
       */
      if (!BUFFERCHECK(tif))
            return (-1);
      td = &tif->tif_dir;
      /*
       * Extend image length if needed
       * (but only for PlanarConfig=1).
       */
      if (row >= td->td_imagelength) {    /* extend image */
            if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
            "Can not change \"ImageLength\" when using separate planes");
                  return (-1);
            }
            td->td_imagelength = row+1;
            imagegrew = 1;
      }
      /*
       * Calculate strip and check for crossings.
       */
      if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
            if (sample >= td->td_samplesperpixel) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                      "%d: Sample out of range, max %d",
                      sample, td->td_samplesperpixel);
                  return (-1);
            }
            strip = sample*td->td_stripsperimage + row/td->td_rowsperstrip;
      } else
            strip = row / td->td_rowsperstrip;
      /*
       * Check strip array to make sure there's space. We don't support
       * dynamically growing files that have data organized in separate
       * bitplanes because it's too painful.  In that case we require that
       * the imagelength be set properly before the first write (so that the
       * strips array will be fully allocated above).
       */
      if (strip >= td->td_nstrips && !TIFFGrowStrips(tif, 1, module))
            return (-1);
      if (strip != tif->tif_curstrip) {
            /*
             * Changing strips -- flush any data present.
             */
            if (!TIFFFlushData(tif))
                  return (-1);
            tif->tif_curstrip = strip;
            /*
             * Watch out for a growing image.  The value of strips/image
             * will initially be 1 (since it can't be deduced until the
             * imagelength is known).
             */
            if (strip >= td->td_stripsperimage && imagegrew)
                  td->td_stripsperimage =
                      TIFFhowmany(td->td_imagelength,td->td_rowsperstrip);
            tif->tif_row =
                (strip % td->td_stripsperimage) * td->td_rowsperstrip;
            if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
                  if (!(*tif->tif_setupencode)(tif))
                        return (-1);
                  tif->tif_flags |= TIFF_CODERSETUP;
            }
        
            tif->tif_rawcc = 0;
            tif->tif_rawcp = tif->tif_rawdata;

            if( td->td_stripbytecount[strip] > 0 )
            {
                  /* if we are writing over existing tiles, zero length */
                  td->td_stripbytecount[strip] = 0;

                  /* this forces TIFFAppendToStrip() to do a seek */
                  tif->tif_curoff = 0;
            }

            if (!(*tif->tif_preencode)(tif, sample))
                  return (-1);
            tif->tif_flags |= TIFF_POSTENCODE;
      }
      /*
       * Ensure the write is either sequential or at the
       * beginning of a strip (or that we can randomly
       * access the data -- i.e. no encoding).
       */
      if (row != tif->tif_row) {
            if (row < tif->tif_row) {
                  /*
                   * Moving backwards within the same strip:
                   * backup to the start and then decode
                   * forward (below).
                   */
                  tif->tif_row = (strip % td->td_stripsperimage) *
                      td->td_rowsperstrip;
                  tif->tif_rawcp = tif->tif_rawdata;
            }
            /*
             * Seek forward to the desired row.
             */
            if (!(*tif->tif_seek)(tif, row - tif->tif_row))
                  return (-1);
            tif->tif_row = row;
      }

        /* swab if needed - note that source buffer will be altered */
        tif->tif_postdecode( tif, (tidata_t) buf, tif->tif_scanlinesize );

      status = (*tif->tif_encoderow)(tif, (tidata_t) buf,
          tif->tif_scanlinesize, sample);

        /* we are now poised at the beginning of the next row */
      tif->tif_row = row + 1;
      return (status);
}

/*
 * Encode the supplied data and write it to the
 * specified strip.
 *
 * NB: Image length must be setup before writing.
 */
tsize_t
TIFFWriteEncodedStrip(TIFF* tif, tstrip_t strip, tdata_t data, tsize_t cc)
{
      static const char module[] = "TIFFWriteEncodedStrip";
      TIFFDirectory *td = &tif->tif_dir;
      tsample_t sample;

      if (!WRITECHECKSTRIPS(tif, module))
            return ((tsize_t) -1);
      /*
       * Check strip array to make sure there's space.
       * We don't support dynamically growing files that
       * have data organized in separate bitplanes because
       * it's too painful.  In that case we require that
       * the imagelength be set properly before the first
       * write (so that the strips array will be fully
       * allocated above).
       */
      if (strip >= td->td_nstrips) {
            if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
            "Can not grow image by strips when using separate planes");
                  return ((tsize_t) -1);
            }
            if (!TIFFGrowStrips(tif, 1, module))
                  return ((tsize_t) -1);
            td->td_stripsperimage =
                TIFFhowmany(td->td_imagelength, td->td_rowsperstrip);
      }
      /*
       * Handle delayed allocation of data buffer.  This
       * permits it to be sized according to the directory
       * info.
       */
      if (!BUFFERCHECK(tif))
            return ((tsize_t) -1);
      tif->tif_curstrip = strip;
      tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
      if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
            if (!(*tif->tif_setupencode)(tif))
                  return ((tsize_t) -1);
            tif->tif_flags |= TIFF_CODERSETUP;
      }
        
      tif->tif_rawcc = 0;
      tif->tif_rawcp = tif->tif_rawdata;

        if( td->td_stripbytecount[strip] > 0 )
        {
            /* if we are writing over existing tiles, zero length. */
            td->td_stripbytecount[strip] = 0;

            /* this forces TIFFAppendToStrip() to do a seek */
            tif->tif_curoff = 0;
        }
        
      tif->tif_flags &= ~TIFF_POSTENCODE;
      sample = (tsample_t)(strip / td->td_stripsperimage);
      if (!(*tif->tif_preencode)(tif, sample))
            return ((tsize_t) -1);

        /* swab if needed - note that source buffer will be altered */
        tif->tif_postdecode( tif, (tidata_t) data, cc );

      if (!(*tif->tif_encodestrip)(tif, (tidata_t) data, cc, sample))
            return ((tsize_t) 0);
      if (!(*tif->tif_postencode)(tif))
            return ((tsize_t) -1);
      if (!isFillOrder(tif, td->td_fillorder) &&
          (tif->tif_flags & TIFF_NOBITREV) == 0)
            TIFFReverseBits(tif->tif_rawdata, tif->tif_rawcc);
      if (tif->tif_rawcc > 0 &&
          !TIFFAppendToStrip(tif, strip, tif->tif_rawdata, tif->tif_rawcc))
            return ((tsize_t) -1);
      tif->tif_rawcc = 0;
      tif->tif_rawcp = tif->tif_rawdata;
      return (cc);
}

/*
 * Write the supplied data to the specified strip.
 *
 * NB: Image length must be setup before writing.
 */
tsize_t
TIFFWriteRawStrip(TIFF* tif, tstrip_t strip, tdata_t data, tsize_t cc)
{
      static const char module[] = "TIFFWriteRawStrip";
      TIFFDirectory *td = &tif->tif_dir;

      if (!WRITECHECKSTRIPS(tif, module))
            return ((tsize_t) -1);
      /*
       * Check strip array to make sure there's space.
       * We don't support dynamically growing files that
       * have data organized in separate bitplanes because
       * it's too painful.  In that case we require that
       * the imagelength be set properly before the first
       * write (so that the strips array will be fully
       * allocated above).
       */
      if (strip >= td->td_nstrips) {
            if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
                  TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
            "Can not grow image by strips when using separate planes");
                  return ((tsize_t) -1);
            }
            /*
             * Watch out for a growing image.  The value of
             * strips/image will initially be 1 (since it
             * can't be deduced until the imagelength is known).
             */
            if (strip >= td->td_stripsperimage)
                  td->td_stripsperimage =
                      TIFFhowmany(td->td_imagelength,td->td_rowsperstrip);
            if (!TIFFGrowStrips(tif, 1, module))
                  return ((tsize_t) -1);
      }
      tif->tif_curstrip = strip;
      tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
      return (TIFFAppendToStrip(tif, strip, (tidata_t) data, cc) ?
          cc : (tsize_t) -1);
}

/*
 * Write and compress a tile of data.  The
 * tile is selected by the (x,y,z,s) coordinates.
 */
tsize_t
TIFFWriteTile(TIFF* tif,
    tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t s)
{
      if (!TIFFCheckTile(tif, x, y, z, s))
            return (-1);
      /*
       * NB: A tile size of -1 is used instead of tif_tilesize knowing
       *     that TIFFWriteEncodedTile will clamp this to the tile size.
       *     This is done because the tile size may not be defined until
       *     after the output buffer is setup in TIFFWriteBufferSetup.
       */
      return (TIFFWriteEncodedTile(tif,
          TIFFComputeTile(tif, x, y, z, s), buf, (tsize_t) -1));
}

/*
 * Encode the supplied data and write it to the
 * specified tile.  There must be space for the
 * data.  The function clamps individual writes
 * to a tile to the tile size, but does not (and
 * can not) check that multiple writes to the same
 * tile do not write more than tile size data.
 *
 * NB: Image length must be setup before writing; this
 *     interface does not support automatically growing
 *     the image on each write (as TIFFWriteScanline does).
 */
tsize_t
TIFFWriteEncodedTile(TIFF* tif, ttile_t tile, tdata_t data, tsize_t cc)
{
      static const char module[] = "TIFFWriteEncodedTile";
      TIFFDirectory *td;
      tsample_t sample;

      if (!WRITECHECKTILES(tif, module))
            return ((tsize_t) -1);
      td = &tif->tif_dir;
      if (tile >= td->td_nstrips) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: Tile %lu out of range, max %lu",
                tif->tif_name, (unsigned long) tile, (unsigned long) td->td_nstrips);
            return ((tsize_t) -1);
      }
      /*
       * Handle delayed allocation of data buffer.  This
       * permits it to be sized more intelligently (using
       * directory information).
       */
      if (!BUFFERCHECK(tif))
            return ((tsize_t) -1);
      tif->tif_curtile = tile;

      tif->tif_rawcc = 0;
      tif->tif_rawcp = tif->tif_rawdata;

        if( td->td_stripbytecount[tile] > 0 )
        {
            /* if we are writing over existing tiles, zero length. */
            td->td_stripbytecount[tile] = 0;

            /* this forces TIFFAppendToStrip() to do a seek */
            tif->tif_curoff = 0;
        }
        
      /* 
       * Compute tiles per row & per column to compute
       * current row and column
       */
      tif->tif_row = (tile % TIFFhowmany(td->td_imagelength, td->td_tilelength))
            * td->td_tilelength;
      tif->tif_col = (tile % TIFFhowmany(td->td_imagewidth, td->td_tilewidth))
            * td->td_tilewidth;

      if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
            if (!(*tif->tif_setupencode)(tif))
                  return ((tsize_t) -1);
            tif->tif_flags |= TIFF_CODERSETUP;
      }
      tif->tif_flags &= ~TIFF_POSTENCODE;
      sample = (tsample_t)(tile/td->td_stripsperimage);
      if (!(*tif->tif_preencode)(tif, sample))
            return ((tsize_t) -1);
      /*
       * Clamp write amount to the tile size.  This is mostly
       * done so that callers can pass in some large number
       * (e.g. -1) and have the tile size used instead.
       */
      if ( cc < 1 || cc > tif->tif_tilesize)
            cc = tif->tif_tilesize;

        /* swab if needed - note that source buffer will be altered */
        tif->tif_postdecode( tif, (tidata_t) data, cc );

      if (!(*tif->tif_encodetile)(tif, (tidata_t) data, cc, sample))
            return ((tsize_t) 0);
      if (!(*tif->tif_postencode)(tif))
            return ((tsize_t) -1);
      if (!isFillOrder(tif, td->td_fillorder) &&
          (tif->tif_flags & TIFF_NOBITREV) == 0)
            TIFFReverseBits((unsigned char *)tif->tif_rawdata, tif->tif_rawcc);
      if (tif->tif_rawcc > 0 && !TIFFAppendToStrip(tif, tile,
          tif->tif_rawdata, tif->tif_rawcc))
            return ((tsize_t) -1);
      tif->tif_rawcc = 0;
      tif->tif_rawcp = tif->tif_rawdata;
      return (cc);
}

/*
 * Write the supplied data to the specified strip.
 * There must be space for the data; we don't check
 * if strips overlap!
 *
 * NB: Image length must be setup before writing; this
 *     interface does not support automatically growing
 *     the image on each write (as TIFFWriteScanline does).
 */
tsize_t
TIFFWriteRawTile(TIFF* tif, ttile_t tile, tdata_t data, tsize_t cc)
{
      static const char module[] = "TIFFWriteRawTile";

      if (!WRITECHECKTILES(tif, module))
            return ((tsize_t) -1);
      if (tile >= tif->tif_dir.td_nstrips) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: Tile %lu out of range, max %lu",
                tif->tif_name, (unsigned long) tile,
                (unsigned long) tif->tif_dir.td_nstrips);
            return ((tsize_t) -1);
      }
      return (TIFFAppendToStrip(tif, tile, (tidata_t) data, cc) ?
          cc : (tsize_t) -1);
}

#define     isUnspecified(tif, f) \
    (TIFFFieldSet(tif,f) && (tif)->tif_dir.td_imagelength == 0)

int
TIFFSetupStrips(TIFF* tif)
{
      TIFFDirectory* td = &tif->tif_dir;

      if (isTiled(tif))
            td->td_stripsperimage =
                isUnspecified(tif, FIELD_TILEDIMENSIONS) ?
                  td->td_samplesperpixel : TIFFNumberOfTiles(tif);
      else
            td->td_stripsperimage =
                isUnspecified(tif, FIELD_ROWSPERSTRIP) ?
                  td->td_samplesperpixel : TIFFNumberOfStrips(tif);
      td->td_nstrips = td->td_stripsperimage;
      if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
            td->td_stripsperimage /= td->td_samplesperpixel;
      td->td_stripoffset = (uint32 *)
          _TIFFmalloc(td->td_nstrips * sizeof (uint32));
      td->td_stripbytecount = (uint32 *)
          _TIFFmalloc(td->td_nstrips * sizeof (uint32));
      if (td->td_stripoffset == NULL || td->td_stripbytecount == NULL)
            return (0);
      /*
       * Place data at the end-of-file
       * (by setting offsets to zero).
       */
      _TIFFmemset(td->td_stripoffset, 0, td->td_nstrips*sizeof (uint32));
      _TIFFmemset(td->td_stripbytecount, 0, td->td_nstrips*sizeof (uint32));
      TIFFSetFieldBit(tif, FIELD_STRIPOFFSETS);
      TIFFSetFieldBit(tif, FIELD_STRIPBYTECOUNTS);
      return (1);
}
#undef isUnspecified

/*
 * Verify file is writable and that the directory
 * information is setup properly.  In doing the latter
 * we also "freeze" the state of the directory so
 * that important information is not changed.
 */
int
TIFFWriteCheck(TIFF* tif, int tiles, const char* module)
{
      if (tif->tif_mode == O_RDONLY) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: File not open for writing",
                tif->tif_name);
            return (0);
      }
      if (tiles ^ isTiled(tif)) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, tiles ?
                "Can not write tiles to a stripped image" :
                "Can not write scanlines to a tiled image");
            return (0);
      }
        
      /*
       * On the first write verify all the required information
       * has been setup and initialize any data structures that
       * had to wait until directory information was set.
       * Note that a lot of our work is assumed to remain valid
       * because we disallow any of the important parameters
       * from changing after we start writing (i.e. once
       * TIFF_BEENWRITING is set, TIFFSetField will only allow
       * the image's length to be changed).
       */
      if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) {
            TIFFErrorExt(tif->tif_clientdata, module,
                "%s: Must set \"ImageWidth\" before writing data",
                tif->tif_name);
            return (0);
      }
      if (tif->tif_dir.td_samplesperpixel == 1) {
            /* 
             * Planarconfiguration is irrelevant in case of single band
             * images and need not be included. We will set it anyway,
             * because this field is used in other parts of library even
             * in the single band case.
             */
            tif->tif_dir.td_planarconfig = PLANARCONFIG_CONTIG;
      } else {
            if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
                  TIFFErrorExt(tif->tif_clientdata, module,
                "%s: Must set \"PlanarConfiguration\" before writing data",
                      tif->tif_name);
                  return (0);
            }
      }
      if (tif->tif_dir.td_stripoffset == NULL && !TIFFSetupStrips(tif)) {
            tif->tif_dir.td_nstrips = 0;
            TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for %s arrays",
                tif->tif_name, isTiled(tif) ? "tile" : "strip");
            return (0);
      }
      tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
      tif->tif_scanlinesize = TIFFScanlineSize(tif);
      tif->tif_flags |= TIFF_BEENWRITING;
      return (1);
}

/*
 * Setup the raw data buffer used for encoding.
 */
int
TIFFWriteBufferSetup(TIFF* tif, tdata_t bp, tsize_t size)
{
      static const char module[] = "TIFFWriteBufferSetup";

      if (tif->tif_rawdata) {
            if (tif->tif_flags & TIFF_MYBUFFER) {
                  _TIFFfree(tif->tif_rawdata);
                  tif->tif_flags &= ~TIFF_MYBUFFER;
            }
            tif->tif_rawdata = NULL;
      }
      if (size == (tsize_t) -1) {
            size = (isTiled(tif) ?
                tif->tif_tilesize : TIFFStripSize(tif));
            /*
             * Make raw data buffer at least 8K
             */
            if (size < 8*1024)
                  size = 8*1024;
            bp = NULL;              /* NB: force malloc */
      }
      if (bp == NULL) {
            bp = _TIFFmalloc(size);
            if (bp == NULL) {
                  TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for output buffer",
                      tif->tif_name);
                  return (0);
            }
            tif->tif_flags |= TIFF_MYBUFFER;
      } else
            tif->tif_flags &= ~TIFF_MYBUFFER;
      tif->tif_rawdata = (tidata_t) bp;
      tif->tif_rawdatasize = size;
      tif->tif_rawcc = 0;
      tif->tif_rawcp = tif->tif_rawdata;
      tif->tif_flags |= TIFF_BUFFERSETUP;
      return (1);
}

/*
 * Grow the strip data structures by delta strips.
 */
static int
TIFFGrowStrips(TIFF* tif, int delta, const char* module)
{
      TIFFDirectory     *td = &tif->tif_dir;
      uint32            *new_stripoffset, *new_stripbytecount;

      assert(td->td_planarconfig == PLANARCONFIG_CONTIG);
      new_stripoffset = (uint32*)_TIFFrealloc(td->td_stripoffset,
            (td->td_nstrips + delta) * sizeof (uint32));
      new_stripbytecount = (uint32*)_TIFFrealloc(td->td_stripbytecount,
            (td->td_nstrips + delta) * sizeof (uint32));
      if (new_stripoffset == NULL || new_stripbytecount == NULL) {
            if (new_stripoffset)
                  _TIFFfree(new_stripoffset);
            if (new_stripbytecount)
                  _TIFFfree(new_stripbytecount);
            td->td_nstrips = 0;
            TIFFErrorExt(tif->tif_clientdata, module, "%s: No space to expand strip arrays",
                    tif->tif_name);
            return (0);
      }
      td->td_stripoffset = new_stripoffset;
      td->td_stripbytecount = new_stripbytecount;
      _TIFFmemset(td->td_stripoffset + td->td_nstrips,
                0, delta*sizeof (uint32));
      _TIFFmemset(td->td_stripbytecount + td->td_nstrips,
                0, delta*sizeof (uint32));
      td->td_nstrips += delta;
      return (1);
}

/*
 * Append the data to the specified strip.
 */
static int
TIFFAppendToStrip(TIFF* tif, tstrip_t strip, tidata_t data, tsize_t cc)
{
      TIFFDirectory *td = &tif->tif_dir;
      static const char module[] = "TIFFAppendToStrip";

      if (td->td_stripoffset[strip] == 0 || tif->tif_curoff == 0) {
            /*
             * No current offset, set the current strip.
             */
            assert(td->td_nstrips > 0);
            if (td->td_stripoffset[strip] != 0) {
                  /*
                   * Prevent overlapping of the data chunks. We need
                         * this to enable in place updating of the compressed
                         * images. Larger blocks will be moved at the end of
                         * the file without any optimization of the spare
                         * space, so such scheme is not too much effective.
                   */
                  if (td->td_stripbytecountsorted) {
                        if (strip == td->td_nstrips - 1
                            || td->td_stripoffset[strip + 1] <
                              td->td_stripoffset[strip] + cc) {
                              td->td_stripoffset[strip] =
                                    TIFFSeekFile(tif, (toff_t)0,
                                               SEEK_END);
                        }
                  } else {
                        tstrip_t i;
                        for (i = 0; i < td->td_nstrips; i++) {
                              if (td->td_stripoffset[i] > 
                                    td->td_stripoffset[strip]
                                  && td->td_stripoffset[i] <
                                    td->td_stripoffset[strip] + cc) {
                                    td->td_stripoffset[strip] =
                                          TIFFSeekFile(tif,
                                                     (toff_t)0,
                                                     SEEK_END);
                              }
                        }
                  }

                  if (!SeekOK(tif, td->td_stripoffset[strip])) {
                        TIFFErrorExt(tif->tif_clientdata, module,
                                "%s: Seek error at scanline %lu",
                                tif->tif_name,
                                (unsigned long)tif->tif_row);
                        return (0);
                  }
            } else
                  td->td_stripoffset[strip] =
                      TIFFSeekFile(tif, (toff_t) 0, SEEK_END);
            tif->tif_curoff = td->td_stripoffset[strip];
      }

      if (!WriteOK(tif, data, cc)) {
            TIFFErrorExt(tif->tif_clientdata, module, "%s: Write error at scanline %lu",
                tif->tif_name, (unsigned long) tif->tif_row);
            return (0);
      }
      tif->tif_curoff += cc;
      td->td_stripbytecount[strip] += cc;
      return (1);
}

/*
 * Internal version of TIFFFlushData that can be
 * called by ``encodestrip routines'' w/o concern
 * for infinite recursion.
 */
int
TIFFFlushData1(TIFF* tif)
{
      if (tif->tif_rawcc > 0) {
            if (!isFillOrder(tif, tif->tif_dir.td_fillorder) &&
                (tif->tif_flags & TIFF_NOBITREV) == 0)
                  TIFFReverseBits((unsigned char *)tif->tif_rawdata,
                      tif->tif_rawcc);
            if (!TIFFAppendToStrip(tif,
                isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip,
                tif->tif_rawdata, tif->tif_rawcc))
                  return (0);
            tif->tif_rawcc = 0;
            tif->tif_rawcp = tif->tif_rawdata;
      }
      return (1);
}

/*
 * Set the current write offset.  This should only be
 * used to set the offset to a known previous location
 * (very carefully), or to 0 so that the next write gets
 * appended to the end of the file.
 */
void
TIFFSetWriteOffset(TIFF* tif, toff_t off)
{
      tif->tif_curoff = off;
}

/* vim: set ts=8 sts=8 sw=8 noet: */

Generated by  Doxygen 1.6.0   Back to index