/*

 * Copyright (c) 1991-1997 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.

 *

 * Strip-organized Image Support Routines.

 */

#include "tiffiop.h"

/*

 * Compute which strip a (row,sample) value is in.

 */

uint32_t TIFFComputeStrip(TIFF *tif, uint32_t row, uint16_t sample)

{

    static const char module[] = "TIFFComputeStrip";

    TIFFDirectory *td = &tif->tif_dir;

    uint32_t strip;

    if (td->td_rowsperstrip == 0)

    {

        TIFFErrorExtR(tif, module,

                      "Cannot compute strip: RowsPerStrip is zero");

        return 0;

    }

    strip = row / td->td_rowsperstrip;

    if (td->td_planarconfig == PLANARCONFIG_SEPARATE)

    {

        if (sample >= td->td_samplesperpixel)

        {

            TIFFErrorExtR(tif, module, "%lu: Sample out of range, max %lu",

                          (unsigned long)sample,

                          (unsigned long)td->td_samplesperpixel);

            return (0);

        }

        strip += (uint32_t)sample * td->td_stripsperimage;

    }

    return (strip);

}

/*

 * Compute how many strips are in an image.

 */

uint32_t TIFFNumberOfStrips(TIFF *tif)

{

    TIFFDirectory *td = &tif->tif_dir;

    uint32_t nstrips;

    if (td->td_rowsperstrip == 0)

    {

        TIFFWarningExtR(tif, "TIFFNumberOfStrips", "RowsPerStrip is zero");

        return 0;

    }

    nstrips = (td->td_rowsperstrip == (uint32_t)-1

                   ? 1

                   : TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));

    if (td->td_planarconfig == PLANARCONFIG_SEPARATE)

        nstrips =

            _TIFFMultiply32(tif, nstrips, (uint32_t)td->td_samplesperpixel,

                            "TIFFNumberOfStrips");

    return (nstrips);

}

/*

 * Compute the # bytes in a variable height, row-aligned strip.

 */

uint64_t TIFFVStripSize64(TIFF *tif, uint32_t nrows)

{

    static const char module[] = "TIFFVStripSize64";

    TIFFDirectory *td = &tif->tif_dir;

    if (nrows == (uint32_t)(-1))

        nrows = td->td_imagelength;

    if ((td->td_planarconfig == PLANARCONFIG_CONTIG) &&

        (td->td_photometric == PHOTOMETRIC_YCBCR) && (!isUpSampled(tif)))

    {

        /*

         * Packed YCbCr data contain one Cb+Cr for every

         * HorizontalSampling*VerticalSampling Y values.

         * Must also roundup width and height when calculating

         * since images that are not a multiple of the

         * horizontal/vertical subsampling area include

         * YCbCr data for the extended image.

         */

        uint16_t ycbcrsubsampling[2];

        uint16_t samplingblock_samples;

        uint32_t samplingblocks_hor;

        uint32_t samplingblocks_ver;

        uint64_t samplingrow_samples;

        uint64_t samplingrow_size;

        if (td->td_samplesperpixel != 3)

        {

            TIFFErrorExtR(tif, module, "Invalid td_samplesperpixel value");

            return 0;

        }

        TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING,

                              ycbcrsubsampling + 0, ycbcrsubsampling + 1);

        if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 &&

             ycbcrsubsampling[0] != 4) ||

            (ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 &&

             ycbcrsubsampling[1] != 4) ||

            (ycbcrsubsampling[0] == 0 || ycbcrsubsampling[1] == 0))

        {

            TIFFErrorExtR(tif, module, "Invalid YCbCr subsampling (%dx%d)",

                          ycbcrsubsampling[0], ycbcrsubsampling[1]);

            return 0;

        }

        samplingblock_samples = ycbcrsubsampling[0] * ycbcrsubsampling[1] + 2;

        samplingblocks_hor =

            TIFFhowmany_32(td->td_imagewidth, ycbcrsubsampling[0]);

        samplingblocks_ver = TIFFhowmany_32(nrows, ycbcrsubsampling[1]);

        samplingrow_samples = _TIFFMultiply64(tif, samplingblocks_hor,

                                              samplingblock_samples, module);

        samplingrow_size = TIFFhowmany8_64(_TIFFMultiply64(

            tif, samplingrow_samples, td->td_bitspersample, module));

        return (

            _TIFFMultiply64(tif, samplingrow_size, samplingblocks_ver, module));

    }

    else

        return (_TIFFMultiply64(tif, nrows, TIFFScanlineSize64(tif), module));

}

tmsize_t TIFFVStripSize(TIFF *tif, uint32_t nrows)

{

    static const char module[] = "TIFFVStripSize";

    uint64_t m;

    m = TIFFVStripSize64(tif, nrows);

    return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Compute the # bytes in a raw strip.

 */

uint64_t TIFFRawStripSize64(TIFF *tif, uint32_t strip)

{

    static const char module[] = "TIFFRawStripSize64";

    uint64_t bytecount = TIFFGetStrileByteCount(tif, strip);

    if (bytecount == 0)

    {

        TIFFErrorExtR(tif, module,

                      "%" PRIu64 ": Invalid strip byte count, strip %lu",

                      (uint64_t)bytecount, (unsigned long)strip);

        bytecount = (uint64_t)-1;

    }

    return bytecount;

}

tmsize_t TIFFRawStripSize(TIFF *tif, uint32_t strip)

{

    static const char module[] = "TIFFRawStripSize";

    uint64_t m;

    tmsize_t n;

    m = TIFFRawStripSize64(tif, strip);

    if (m == (uint64_t)(-1))

        n = (tmsize_t)(-1);

    else

    {

        n = (tmsize_t)m;

        if ((uint64_t)n != m)

        {

            TIFFErrorExtR(tif, module, "Integer overflow");

            n = 0;

        }

    }

    return (n);

}

/*

 * Compute the # bytes in a (row-aligned) strip.

 *

 * Note that if RowsPerStrip is larger than the

 * recorded ImageLength, then the strip size is

 * truncated to reflect the actual space required

 * to hold the strip.

 */

uint64_t TIFFStripSize64(TIFF *tif)

{

    TIFFDirectory *td = &tif->tif_dir;

    uint32_t rps = td->td_rowsperstrip;

    if (rps > td->td_imagelength)

        rps = td->td_imagelength;

    return (TIFFVStripSize64(tif, rps));

}

tmsize_t TIFFStripSize(TIFF *tif)

{

    static const char module[] = "TIFFStripSize";

    uint64_t m;

    m = TIFFStripSize64(tif);

    return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Compute a default strip size based on the image

 * characteristics and a requested value.  If the

 * request is <1 then we choose a strip size according

 * to certain heuristics.

 */

uint32_t TIFFDefaultStripSize(TIFF *tif, uint32_t request)

{

    return (*tif->tif_defstripsize)(tif, request);

}

uint32_t _TIFFDefaultStripSize(TIFF *tif, uint32_t s)

{

    if ((int32_t)s < 1)

    {

        /*

         * If RowsPerStrip is unspecified, try to break the

         * image up into strips that are approximately

         * STRIP_SIZE_DEFAULT bytes long.

         */

        uint64_t scanlinesize;

        uint64_t rows;

        scanlinesize = TIFFScanlineSize64(tif);

        if (scanlinesize == 0)

            scanlinesize = 1;

        rows = (uint64_t)STRIP_SIZE_DEFAULT / scanlinesize;

        if (rows == 0)

            rows = 1;

        else if (rows > 0xFFFFFFFF)

            rows = 0xFFFFFFFF;

        s = (uint32_t)rows;

    }

    return (s);

}

/*

 * Return the number of bytes to read/write in a call to

 * one of the scanline-oriented i/o routines.  Note that

 * this number may be 1/samples-per-pixel if data is

 * stored as separate planes.

 * The ScanlineSize in case of YCbCrSubsampling is defined as the

 * strip size divided by the strip height, i.e. the size of a pack of vertical

 * subsampling lines divided by vertical subsampling. It should thus make

 * sense when multiplied by a multiple of vertical subsampling.

 */

uint64_t TIFFScanlineSize64(TIFF *tif)

{

    static const char module[] = "TIFFScanlineSize64";

    TIFFDirectory *td = &tif->tif_dir;

    uint64_t scanline_size;

    if (td->td_planarconfig == PLANARCONFIG_CONTIG)

    {

        if ((td->td_photometric == PHOTOMETRIC_YCBCR) &&

            (td->td_samplesperpixel == 3) && (!isUpSampled(tif)))

        {

            uint16_t ycbcrsubsampling[2];

            uint16_t samplingblock_samples;

            uint32_t samplingblocks_hor;

            uint64_t samplingrow_samples;

            uint64_t samplingrow_size;

            if (td->td_samplesperpixel != 3)

            {

                TIFFErrorExtR(tif, module, "Invalid td_samplesperpixel value");

                return 0;

            }

            TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING,

                                  ycbcrsubsampling + 0, ycbcrsubsampling + 1);

            if (((ycbcrsubsampling[0] != 1) && (ycbcrsubsampling[0] != 2) &&

                 (ycbcrsubsampling[0] != 4)) ||

                ((ycbcrsubsampling[1] != 1) && (ycbcrsubsampling[1] != 2) &&

                 (ycbcrsubsampling[1] != 4)) ||

                ((ycbcrsubsampling[0] == 0) || (ycbcrsubsampling[1] == 0)))

            {

                TIFFErrorExtR(tif, module, "Invalid YCbCr subsampling");

                return 0;

            }

            samplingblock_samples =

                ycbcrsubsampling[0] * ycbcrsubsampling[1] + 2;

            samplingblocks_hor =

                TIFFhowmany_32(td->td_imagewidth, ycbcrsubsampling[0]);

            samplingrow_samples = _TIFFMultiply64(

                tif, samplingblocks_hor, samplingblock_samples, module);

            samplingrow_size =

                TIFFhowmany_64(_TIFFMultiply64(tif, samplingrow_samples,

                                               td->td_bitspersample, module),

                               8);

            scanline_size = (samplingrow_size / ycbcrsubsampling[1]);

        }

        else

        {

            uint64_t scanline_samples;

            uint32_t scanline_width = td->td_imagewidth;

#if 0

            // Tries to fix https://gitlab.com/libtiff/libtiff/-/merge_requests/564

            // but causes regression when decoding legit files with tiffcp -c none

            // Cf https://gitlab.com/libtiff/libtiff/-/merge_requests/644

            if (td->td_photometric == PHOTOMETRIC_YCBCR)

            {

                uint16_t subsampling_hor;

                uint16_t ignored;

                TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING,

                                      &subsampling_hor, &ignored);

                if (subsampling_hor > 1) // roundup width for YCbCr

                    scanline_width =

                        TIFFroundup_32(scanline_width, subsampling_hor);

            }

#endif

            scanline_samples = _TIFFMultiply64(tif, scanline_width,

                                               td->td_samplesperpixel, module);

            scanline_size =

                TIFFhowmany_64(_TIFFMultiply64(tif, scanline_samples,

                                               td->td_bitspersample, module),

                               8);

        }

    }

    else

    {

        scanline_size =

            TIFFhowmany_64(_TIFFMultiply64(tif, td->td_imagewidth,

                                           td->td_bitspersample, module),

                           8);

    }

    if (scanline_size == 0)

    {

        TIFFErrorExtR(tif, module, "Computed scanline size is zero");

        return 0;

    }

    return (scanline_size);

}

tmsize_t TIFFScanlineSize(TIFF *tif)

{

    static const char module[] = "TIFFScanlineSize";

    uint64_t m;

    m = TIFFScanlineSize64(tif);

    return _TIFFCastUInt64ToSSize(tif, m, module);

}

/*

 * Return the number of bytes required to store a complete

 * decoded and packed raster scanline (as opposed to the

 * I/O size returned by TIFFScanlineSize which may be less

 * if data is store as separate planes).

 */

uint64_t TIFFRasterScanlineSize64(TIFF *tif)

{

    static const char module[] = "TIFFRasterScanlineSize64";

    TIFFDirectory *td = &tif->tif_dir;

    uint64_t scanline;

    scanline =

        _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module);

    if (td->td_planarconfig == PLANARCONFIG_CONTIG)

    {

        scanline =

            _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module);

        return (TIFFhowmany8_64(scanline));

    }

    else

        return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline),

                                td->td_samplesperpixel, module));

}

tmsize_t TIFFRasterScanlineSize(TIFF *tif)

{

    static const char module[] = "TIFFRasterScanlineSize";

    uint64_t m;

    m = TIFFRasterScanlineSize64(tif);

    return _TIFFCastUInt64ToSSize(tif, m, module);

}