/* $Id: tif_write.c,v 1.4 2005/11/19 16:02:59 malaterre 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) {
      TIFFError(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) {
      TIFFError(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;
  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;
  }
  /*
   * 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);
  /*
   * 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) {
      TIFFError(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) {
      TIFFError(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) {
    TIFFError(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) {
    TIFFError(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) {
    TIFFError(module, "%s: File not open for writing",
        tif->tif_name);
    return (0);
  }
  if (tiles ^ isTiled(tif)) {
    TIFFError(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)) {
    TIFFError(module,
        "%s: Must set \"ImageWidth\" before writing data",
        tif->tif_name);
    return (0);
  }
  if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
    TIFFError(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;
    TIFFError(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) {
      TIFFError(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;
    TIFFError(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])) {
        TIFFError(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)) {
    TIFFError(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;
}

