/* $Id: tif_write.c,v 1.37 2012-08-13 22:10:17 fwarmerdam 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, (tmsize_t) -1))

static int TIFFGrowStrips(TIFF* tif, uint32 delta, const char* module);
static int TIFFAppendToStrip(TIFF* tif, uint32 strip, uint8* data, tmsize_t cc);

int
TIFFWriteScanline(TIFF* tif, void* buf, uint32 row, uint16 sample)
{
  static const char module[] = "TIFFWriteScanline";
  register TIFFDirectory *td;
  int status, imagegrew = 0;
  uint32 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);
        tif->tif_flags |= TIFF_BUF4WRITE; /* not strictly sure this is right*/

  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, module,
          "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, module,
          "%lu: Sample out of range, max %lu",
          (unsigned long) sample, (unsigned long) 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_32(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, (uint8*) buf, tif->tif_scanlinesize );

  status = (*tif->tif_encoderow)(tif, (uint8*) 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.
 */
tmsize_t
TIFFWriteEncodedStrip(TIFF* tif, uint32 strip, void* data, tmsize_t cc)
{
  static const char module[] = "TIFFWriteEncodedStrip";
  TIFFDirectory *td = &tif->tif_dir;
  uint16 sample;

  if (!WRITECHECKSTRIPS(tif, module))
    return ((tmsize_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, module,
          "Can not grow image by strips when using separate planes");
      return ((tmsize_t) -1);
    }
    if (!TIFFGrowStrips(tif, 1, module))
      return ((tmsize_t) -1);
    td->td_stripsperimage =
        TIFFhowmany_32(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 ((tmsize_t) -1);

        tif->tif_flags |= TIFF_BUF4WRITE;
  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 ((tmsize_t) -1);
    tif->tif_flags |= TIFF_CODERSETUP;
  }

  if( td->td_stripbytecount[strip] > 0 )
        {
            /* Make sure that at the first attempt of rewriting the tile, we will have */
            /* more bytes available in the output buffer than the previous byte count, */
            /* so that TIFFAppendToStrip() will detect the overflow when it is called the first */
            /* time if the new compressed tile is bigger than the older one. (GDAL #4771) */
            if( tif->tif_rawdatasize <= td->td_stripbytecount[strip] )
            {
                if( !(TIFFWriteBufferSetup(tif, NULL,
                    (tmsize_t)TIFFroundup_64((uint64)(td->td_stripbytecount[strip] + 1), 1024))) )
                    return ((tmsize_t)(-1));
            }

      /* Force TIFFAppendToStrip() to consider placing data at end
               of file. */
            tif->tif_curoff = 0;
        }

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

  tif->tif_flags &= ~TIFF_POSTENCODE;
  sample = (uint16)(strip / td->td_stripsperimage);
  if (!(*tif->tif_preencode)(tif, sample))
    return ((tmsize_t) -1);

        /* swab if needed - note that source buffer will be altered */
  tif->tif_postdecode( tif, (uint8*) data, cc );

  if (!(*tif->tif_encodestrip)(tif, (uint8*) data, cc, sample))
    return (0);
  if (!(*tif->tif_postencode)(tif))
    return ((tmsize_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 ((tmsize_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.
 */
tmsize_t
TIFFWriteRawStrip(TIFF* tif, uint32 strip, void* data, tmsize_t cc)
{
  static const char module[] = "TIFFWriteRawStrip";
  TIFFDirectory *td = &tif->tif_dir;

  if (!WRITECHECKSTRIPS(tif, module))
    return ((tmsize_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, module,
          "Can not grow image by strips when using separate planes");
      return ((tmsize_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_32(td->td_imagelength,td->td_rowsperstrip);
    if (!TIFFGrowStrips(tif, 1, module))
      return ((tmsize_t) -1);
  }
  tif->tif_curstrip = strip;
  tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
  return (TIFFAppendToStrip(tif, strip, (uint8*) data, cc) ?
      cc : (tmsize_t) -1);
}

/*
 * Write and compress a tile of data.  The
 * tile is selected by the (x,y,z,s) coordinates.
 */
tmsize_t
TIFFWriteTile(TIFF* tif, void* buf, uint32 x, uint32 y, uint32 z, uint16 s)
{
  if (!TIFFCheckTile(tif, x, y, z, s))
    return ((tmsize_t)(-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, (tmsize_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).
 */
tmsize_t
TIFFWriteEncodedTile(TIFF* tif, uint32 tile, void* data, tmsize_t cc)
{
  static const char module[] = "TIFFWriteEncodedTile";
  TIFFDirectory *td;
  uint16 sample;

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

        tif->tif_flags |= TIFF_BUF4WRITE;
  tif->tif_curtile = tile;

  if( td->td_stripbytecount[tile] > 0 )
        {
            /* Make sure that at the first attempt of rewriting the tile, we will have */
            /* more bytes available in the output buffer than the previous byte count, */
            /* so that TIFFAppendToStrip() will detect the overflow when it is called the first */
            /* time if the new compressed tile is bigger than the older one. (GDAL #4771) */
            if( tif->tif_rawdatasize <= td->td_stripbytecount[tile] )
            {
                if( !(TIFFWriteBufferSetup(tif, NULL,
                    (tmsize_t)TIFFroundup_64((uint64)(td->td_stripbytecount[tile] + 1), 1024))) )
                    return ((tmsize_t)(-1));
            }

      /* Force TIFFAppendToStrip() to consider placing data at end
               of file. */
            tif->tif_curoff = 0;
        }

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

  /*
   * Compute tiles per row & per column to compute
   * current row and column
   */
  tif->tif_row = (tile % TIFFhowmany_32(td->td_imagelength, td->td_tilelength))
    * td->td_tilelength;
  tif->tif_col = (tile % TIFFhowmany_32(td->td_imagewidth, td->td_tilewidth))
    * td->td_tilewidth;

  if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
    if (!(*tif->tif_setupencode)(tif))
      return ((tmsize_t)(-1));
    tif->tif_flags |= TIFF_CODERSETUP;
  }
  tif->tif_flags &= ~TIFF_POSTENCODE;
  sample = (uint16)(tile/td->td_stripsperimage);
  if (!(*tif->tif_preencode)(tif, sample))
    return ((tmsize_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, (uint8*) data, cc );

  if (!(*tif->tif_encodetile)(tif, (uint8*) data, cc, sample))
    return (0);
  if (!(*tif->tif_postencode)(tif))
    return ((tmsize_t)(-1));
  if (!isFillOrder(tif, td->td_fillorder) &&
      (tif->tif_flags & TIFF_NOBITREV) == 0)
    TIFFReverseBits((uint8*)tif->tif_rawdata, tif->tif_rawcc);
  if (tif->tif_rawcc > 0 && !TIFFAppendToStrip(tif, tile,
      tif->tif_rawdata, tif->tif_rawcc))
    return ((tmsize_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).
 */
tmsize_t
TIFFWriteRawTile(TIFF* tif, uint32 tile, void* data, tmsize_t cc)
{
  static const char module[] = "TIFFWriteRawTile";

  if (!WRITECHECKTILES(tif, module))
    return ((tmsize_t)(-1));
  if (tile >= tif->tif_dir.td_nstrips) {
    TIFFErrorExt(tif->tif_clientdata, module, "Tile %lu out of range, max %lu",
        (unsigned long) tile,
        (unsigned long) tif->tif_dir.td_nstrips);
    return ((tmsize_t)(-1));
  }
  return (TIFFAppendToStrip(tif, tile, (uint8*) data, cc) ?
      cc : (tmsize_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 = (uint64 *)
      _TIFFmalloc(td->td_nstrips * sizeof (uint64));
  td->td_stripbytecount = (uint64 *)
      _TIFFmalloc(td->td_nstrips * sizeof (uint64));
  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 (uint64));
  _TIFFmemset(td->td_stripbytecount, 0, td->td_nstrips*sizeof (uint64));
  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, "File not open for writing");
    return (0);
  }
  if (tiles ^ isTiled(tif)) {
    TIFFErrorExt(tif->tif_clientdata, module, tiles ?
        "Can not write tiles to a stripped image" :
        "Can not write scanlines to a tiled image");
    return (0);
  }

        _TIFFFillStriles( tif );

  /*
   * 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,
        "Must set \"ImageWidth\" before writing data");
    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.
     */
    if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG))
                    tif->tif_dir.td_planarconfig = PLANARCONFIG_CONTIG;
  } else {
    if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
      TIFFErrorExt(tif->tif_clientdata, module,
          "Must set \"PlanarConfiguration\" before writing data");
      return (0);
    }
  }
  if (tif->tif_dir.td_stripoffset == NULL && !TIFFSetupStrips(tif)) {
    tif->tif_dir.td_nstrips = 0;
    TIFFErrorExt(tif->tif_clientdata, module, "No space for %s arrays",
        isTiled(tif) ? "tile" : "strip");
    return (0);
  }
  if (isTiled(tif))
  {
    tif->tif_tilesize = TIFFTileSize(tif);
    if (tif->tif_tilesize == 0)
      return (0);
  }
  else
    tif->tif_tilesize = (tmsize_t)(-1);
  tif->tif_scanlinesize = TIFFScanlineSize(tif);
  if (tif->tif_scanlinesize == 0)
    return (0);
  tif->tif_flags |= TIFF_BEENWRITING;
  return (1);
}

/*
 * Setup the raw data buffer used for encoding.
 */
int
TIFFWriteBufferSetup(TIFF* tif, void* bp, tmsize_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 == (tmsize_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, "No space for output buffer");
      return (0);
    }
    tif->tif_flags |= TIFF_MYBUFFER;
  } else
    tif->tif_flags &= ~TIFF_MYBUFFER;
  tif->tif_rawdata = (uint8*) 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, uint32 delta, const char* module)
{
  TIFFDirectory *td = &tif->tif_dir;
  uint64* new_stripoffset;
  uint64* new_stripbytecount;

  assert(td->td_planarconfig == PLANARCONFIG_CONTIG);
  new_stripoffset = (uint64*)_TIFFrealloc(td->td_stripoffset,
    (td->td_nstrips + delta) * sizeof (uint64));
  new_stripbytecount = (uint64*)_TIFFrealloc(td->td_stripbytecount,
    (td->td_nstrips + delta) * sizeof (uint64));
  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, "No space to expand strip arrays");
    return (0);
  }
  td->td_stripoffset = new_stripoffset;
  td->td_stripbytecount = new_stripbytecount;
  _TIFFmemset(td->td_stripoffset + td->td_nstrips,
        0, delta*sizeof (uint64));
  _TIFFmemset(td->td_stripbytecount + td->td_nstrips,
        0, delta*sizeof (uint64));
  td->td_nstrips += delta;
        tif->tif_flags |= TIFF_DIRTYDIRECT;

  return (1);
}

/*
 * Append the data to the specified strip.
 */
static int
TIFFAppendToStrip(TIFF* tif, uint32 strip, uint8* data, tmsize_t cc)
{
  static const char module[] = "TIFFAppendToStrip";
  TIFFDirectory *td = &tif->tif_dir;
  uint64 m;
        int64 old_byte_count = -1;

  if (td->td_stripoffset[strip] == 0 || tif->tif_curoff == 0) {
            assert(td->td_nstrips > 0);

            if( td->td_stripbytecount[strip] != 0
                && td->td_stripoffset[strip] != 0
                && td->td_stripbytecount[strip] >= (uint64) cc )
            {
                /*
                 * There is already tile data on disk, and the new tile
                 * data we have will fit in the same space.  The only
                 * aspect of this that is risky is that there could be
                 * more data to append to this strip before we are done
                 * depending on how we are getting called.
                 */
                if (!SeekOK(tif, td->td_stripoffset[strip])) {
                    TIFFErrorExt(tif->tif_clientdata, module,
                                 "Seek error at scanline %lu",
                                 (unsigned long)tif->tif_row);
                    return (0);
                }
            }
            else
            {
                /*
                 * Seek to end of file, and set that as our location to
                 * write this strip.
                 */
                td->td_stripoffset[strip] = TIFFSeekFile(tif, 0, SEEK_END);
                tif->tif_flags |= TIFF_DIRTYSTRIP;
            }

            tif->tif_curoff = td->td_stripoffset[strip];

            /*
             * We are starting a fresh strip/tile, so set the size to zero.
             */
            old_byte_count = td->td_stripbytecount[strip];
            td->td_stripbytecount[strip] = 0;
  }

  m = tif->tif_curoff+cc;
  if (!(tif->tif_flags&TIFF_BIGTIFF))
    m = (uint32)m;
  if ((m<tif->tif_curoff)||(m<(uint64)cc))
  {
    TIFFErrorExt(tif->tif_clientdata, module, "Maximum TIFF file size exceeded");
    return (0);
  }
  if (!WriteOK(tif, data, cc)) {
    TIFFErrorExt(tif->tif_clientdata, module, "Write error at scanline %lu",
        (unsigned long) tif->tif_row);
        return (0);
  }
  tif->tif_curoff = m;
  td->td_stripbytecount[strip] += cc;

        if( (int64) td->td_stripbytecount[strip] != old_byte_count )
            tif->tif_flags |= TIFF_DIRTYSTRIP;

  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 && tif->tif_flags & TIFF_BUF4WRITE ) {
    if (!isFillOrder(tif, tif->tif_dir.td_fillorder) &&
        (tif->tif_flags & TIFF_NOBITREV) == 0)
      TIFFReverseBits((uint8*)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: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */
