/* $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></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))</tif->

	{

		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:

 */