/* Id */

/*
 * 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
TEXPORT
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: */
