/* $Id: tif_read.c,v 1.66 2017-11-17 20:21:00 erouault 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 Read Support

 */

#include "tiffiop.h"

#include <stdio.h>

#define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0))

#define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1)

int TIFFFillStrip(TIFF* tif, uint32 strip);

int TIFFFillTile(TIFF* tif, uint32 tile);

static int TIFFStartStrip(TIFF* tif, uint32 strip);

static int TIFFStartTile(TIFF* tif, uint32 tile);

static int TIFFCheckRead(TIFF*, int);

static tmsize_t

TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,const char* module);

static tmsize_t

TIFFReadRawTile1(TIFF* tif, uint32 tile, void* buf, tmsize_t size, const char* module);

#define NOSTRIP ((uint32)(-1))       /* undefined state */

#define NOTILE ((uint32)(-1))         /* undefined state */

#define INITIAL_THRESHOLD (1024 * 1024)

#define THRESHOLD_MULTIPLIER 10

#define MAX_THRESHOLD (THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * INITIAL_THRESHOLD)

/* Read 'size' bytes in tif_rawdata buffer starting at offset 'rawdata_offset'

 * Returns 1 in case of success, 0 otherwise. */

static int TIFFReadAndRealloc( TIFF* tif, tmsize_t size,

                               tmsize_t rawdata_offset,

                               int is_strip, uint32 strip_or_tile,

                               const char* module )

{

#if SIZEOF_VOIDP == 8 || SIZEOF_SIZE_T == 8

        tmsize_t threshold = INITIAL_THRESHOLD;

#endif

        tmsize_t already_read = 0;

        /* On 64 bit processes, read first a maximum of 1 MB, then 10 MB, etc */

        /* so as to avoid allocating too much memory in case the file is too */

        /* short. We could ask for the file size, but this might be */

        /* expensive with some I/O layers (think of reading a gzipped file) */

        /* Restrict to 64 bit processes, so as to avoid reallocs() */

        /* on 32 bit processes where virtual memory is scarce.  */

        while( already_read < size )

        {

            tmsize_t bytes_read;

            tmsize_t to_read = size - already_read;

#if SIZEOF_VOIDP == 8 || SIZEOF_SIZE_T == 8

            if( to_read >= threshold && threshold < MAX_THRESHOLD &&

                already_read + to_read + rawdata_offset > tif->tif_rawdatasize )

            {

                to_read = threshold;

                threshold *= THRESHOLD_MULTIPLIER;

            }

#endif

            if (already_read + to_read + rawdata_offset > tif->tif_rawdatasize) {

                uint8* new_rawdata;

                assert((tif->tif_flags & TIFF_MYBUFFER) != 0);

                tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64(

                        (uint64)already_read + to_read + rawdata_offset, 1024);

                if (tif->tif_rawdatasize==0) {

                    TIFFErrorExt(tif->tif_clientdata, module,

                                "Invalid buffer size");

                    return 0;

                }

                new_rawdata = (uint8*) _TIFFrealloc(

                                tif->tif_rawdata, tif->tif_rawdatasize);

                if( new_rawdata == 0 )

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                        "No space for data buffer at scanline %lu",

                        (unsigned long) tif->tif_row);

                    _TIFFfree(tif->tif_rawdata);

                    tif->tif_rawdata = 0;

                    tif->tif_rawdatasize = 0;

                    return 0;

                }

                tif->tif_rawdata = new_rawdata;

            }

            bytes_read = TIFFReadFile(tif,

                tif->tif_rawdata + rawdata_offset + already_read, to_read);

            already_read += bytes_read;

            if (bytes_read != to_read) {

                memset( tif->tif_rawdata + rawdata_offset + already_read, 0,

                        tif->tif_rawdatasize - rawdata_offset - already_read );

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

                if( is_strip )

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                        "Read error at scanline %lu; got %I64u bytes, "

                        "expected %I64u",

                                        (unsigned long) tif->tif_row,

                                        (unsigned __int64) already_read,

                                        (unsigned __int64) size);

                }

                else

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                        "Read error at row %lu, col %lu, tile %lu; "

                        "got %I64u bytes, expected %I64u",

                                        (unsigned long) tif->tif_row,

                                        (unsigned long) tif->tif_col,

                                        (unsigned long) strip_or_tile,

                                        (unsigned __int64) already_read,

                                        (unsigned __int64) size);

                }

#else

                if( is_strip )

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                        "Read error at scanline %lu; got %llu bytes, "

                        "expected %llu",

                                        (unsigned long) tif->tif_row,

                                        (unsigned long long) already_read,

                                        (unsigned long long) size);

                }

                else

                {

                    TIFFErrorExt(tif->tif_clientdata, module,

                        "Read error at row %lu, col %lu, tile %lu; "

                        "got %llu bytes, expected %llu",

                                        (unsigned long) tif->tif_row,

                                        (unsigned long) tif->tif_col,

                                        (unsigned long) strip_or_tile,

                                        (unsigned long long) already_read,

                                        (unsigned long long) size);

                }

#endif

                return 0;

            }

        }

        return 1;

}

static int

TIFFFillStripPartial( TIFF *tif, int strip, tmsize_t read_ahead, int restart )

{

	static const char module[] = "TIFFFillStripPartial";

	register TIFFDirectory *td = &tif->tif_dir;

        tmsize_t unused_data;

        uint64 read_offset;

        tmsize_t to_read;

        tmsize_t read_ahead_mod;

        /* tmsize_t bytecountm; */

        if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)

            return 0;

        /*

         * Expand raw data buffer, if needed, to hold data

         * strip coming from file (perhaps should set upper

         * bound on the size of a buffer we'll use?).

         */

        /* bytecountm=(tmsize_t) td->td_stripbytecount[strip]; */

        /* Not completely sure where the * 2 comes from, but probably for */

        /* an exponentional growth strategy of tif_rawdatasize */

        if( read_ahead < TIFF_TMSIZE_T_MAX / 2 )

                read_ahead_mod = read_ahead * 2;

        else

                read_ahead_mod = read_ahead;

        if (read_ahead_mod > tif->tif_rawdatasize) {

                assert( restart );

                tif->tif_curstrip = NOSTRIP;

                if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {

                        TIFFErrorExt(tif->tif_clientdata, module,

                                     "Data buffer too small to hold part of strip %lu",

                                     (unsigned long) strip);

                        return (0);

                }

        }

        if( restart )

        {

                tif->tif_rawdataloaded = 0;

                tif->tif_rawdataoff = 0;

        }

        /*

        ** If we are reading more data, move any unused data to the

        ** start of the buffer.

        */

        if( tif->tif_rawdataloaded > 0 )

                unused_data = tif->tif_rawdataloaded - (tif->tif_rawcp - tif->tif_rawdata);

        else

                unused_data = 0;

        if( unused_data > 0 )

        {

		assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);

                memmove( tif->tif_rawdata, tif->tif_rawcp, unused_data );

        }

        /*

        ** Seek to the point in the file where more data should be read.

        */

        read_offset = td->td_stripoffset[strip]

                + tif->tif_rawdataoff + tif->tif_rawdataloaded;

        if (!SeekOK(tif, read_offset)) {

                TIFFErrorExt(tif->tif_clientdata, module,

                             "Seek error at scanline %lu, strip %lu",

                             (unsigned long) tif->tif_row, (unsigned long) strip);

                return 0;

        }

        /*

        ** How much do we want to read?

        */

        if( read_ahead_mod > tif->tif_rawdatasize )

                to_read = read_ahead_mod - unused_data;

        else

                to_read = tif->tif_rawdatasize - unused_data;

        if( (uint64) to_read > td->td_stripbytecount[strip] 

            - tif->tif_rawdataoff - tif->tif_rawdataloaded )

        {

                to_read = (tmsize_t) td->td_stripbytecount[strip]

                        - tif->tif_rawdataoff - tif->tif_rawdataloaded;

        }

	assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);

        if( !TIFFReadAndRealloc( tif, to_read, unused_data,

                                 1, /* is_strip */

                                 0, /* strip_or_tile */

                                 module) )

        {

                return 0;

        }

        tif->tif_rawdataoff = tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data ;

        tif->tif_rawdataloaded = unused_data + to_read;

        tif->tif_rawcc = tif->tif_rawdataloaded;

        tif->tif_rawcp = tif->tif_rawdata;

        if (!isFillOrder(tif, td->td_fillorder) &&

            (tif->tif_flags & TIFF_NOBITREV) == 0) {

		assert((tif->tif_flags&TIFF_BUFFERMMAP)==0);

                TIFFReverseBits(tif->tif_rawdata + unused_data, to_read );

	}

        /*

        ** When starting a strip from the beginning we need to

        ** restart the decoder.

        */

        if( restart )

        {

#ifdef JPEG_SUPPORT

            /* A bit messy since breaks the codec abstraction. Ultimately */

            /* there should be a function pointer for that, but it seems */

            /* only JPEG is affected. */

            /* For JPEG, if there are multiple scans (can generally be known */

            /* with the  read_ahead used), we need to read the whole strip */

            if( tif->tif_dir.td_compression==COMPRESSION_JPEG &&

                (uint64)tif->tif_rawcc < td->td_stripbytecount[strip] )

            {

                if( TIFFJPEGIsFullStripRequired(tif) )

                {

                    return TIFFFillStrip(tif, strip);

                }

            }

#endif

            return TIFFStartStrip(tif, strip);

        }

        else

        {

                return 1;

        }

}

/*

 * Seek to a random row+sample in a file.

 *

 * Only used by TIFFReadScanline, and is only used on

 * strip organized files.  We do some tricky stuff to try

 * and avoid reading the whole compressed raw data for big

 * strips.

 */

static int

TIFFSeek(TIFF* tif, uint32 row, uint16 sample )

{

	register TIFFDirectory *td = &tif->tif_dir;

	uint32 strip;

        int    whole_strip;

	tmsize_t read_ahead = 0;

        /*

        ** Establish what strip we are working from.

        */

	if (row >= td->td_imagelength) {	/* out of range */

		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

		    "%lu: Row out of range, max %lu",

		    (unsigned long) row,

		    (unsigned long) td->td_imagelength);

		return (0);

	}

	if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {

		if (sample >= td->td_samplesperpixel) {

			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,

			    "%lu: Sample out of range, max %lu",

			    (unsigned long) sample, (unsigned long) td->td_samplesperpixel);

			return (0);

		}

		strip = (uint32)sample*td->td_stripsperimage + row/td->td_rowsperstrip;

	} else

		strip = row / td->td_rowsperstrip;

        /*

         * Do we want to treat this strip as one whole chunk or

         * read it a few lines at a time?

         */

#if defined(CHUNKY_STRIP_READ_SUPPORT)

        if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)

            return 0;

        whole_strip = tif->tif_dir.td_stripbytecount[strip] < 10

                || isMapped(tif);

#else

        whole_strip = 1;

#endif

        if( !whole_strip )

        {

                /* 16 is for YCbCr mode where we may need to read 16 */

                /* lines at a time to get a decompressed line, and 5000 */

                /* is some constant value, for example for JPEG tables */

                if( tif->tif_scanlinesize < TIFF_TMSIZE_T_MAX / 16 &&

                    tif->tif_scanlinesize * 16 < TIFF_TMSIZE_T_MAX - 5000 )

                {

                        read_ahead = tif->tif_scanlinesize * 16 + 5000;

                }

                else

                {

                        read_ahead = tif->tif_scanlinesize;

                }

        }

        /*

         * If we haven't loaded this strip, do so now, possibly

         * only reading the first part.

         */

	if (strip != tif->tif_curstrip) {	/* different strip, refill */

                if( whole_strip )

                {

                        if (!TIFFFillStrip(tif, strip))

                                return (0);

                }

                else

                {

                        if( !TIFFFillStripPartial(tif,strip,read_ahead,1) )

                                return 0;

                }

	}

        /*

        ** If we already have some data loaded, do we need to read some more?

        */

        else if( !whole_strip )

        {

                if( ((tif->tif_rawdata + tif->tif_rawdataloaded) - tif->tif_rawcp) < read_ahead 

                    && (uint64) tif->tif_rawdataoff+tif->tif_rawdataloaded < td->td_stripbytecount[strip] )

                {

                        if( !TIFFFillStripPartial(tif,strip,read_ahead,0) )

                                return 0;

                }

        }

        if (row < tif->tif_row) {

		/*

		 * Moving backwards within the same strip: backup

		 * to the start and then decode forward (below).

		 *

		 * NB: If you're planning on lots of random access within a

		 * strip, it's better to just read and decode the entire

		 * strip, and then access the decoded data in a random fashion.

		 */

                if( tif->tif_rawdataoff != 0 )

                {

                        if( !TIFFFillStripPartial(tif,strip,read_ahead,1) )

                                return 0;

                }

                else

                {

                        if (!TIFFStartStrip(tif, strip))

                                return (0);

                }

	}

	if (row != tif->tif_row) {

		/*

		 * Seek forward to the desired row.

		 */

                /* TODO: Will this really work with partial buffers? */

		if (!(*tif->tif_seek)(tif, row - tif->tif_row))

			return (0);

		tif->tif_row = row;

	}

	return (1);

}

int

TIFFReadScanline(TIFF* tif, void* buf, uint32 row, uint16 sample)

{

	int e;

	if (!TIFFCheckRead(tif, 0))

		return (-1);

	if( (e = TIFFSeek(tif, row, sample)) != 0) {

		/*

		 * Decompress desired row into user buffer.

		 */

		e = (*tif->tif_decoderow)

		    (tif, (uint8*) buf, tif->tif_scanlinesize, sample);  

		/* we are now poised at the beginning of the next row */

		tif->tif_row = row + 1;

		if (e)

			(*tif->tif_postdecode)(tif, (uint8*) buf,

			    tif->tif_scanlinesize);  

	}

	return (e > 0 ? 1 : -1);

}

/*

 * Calculate the strip size according to the number of

 * rows in the strip (check for truncated last strip on any

 * of the separations).

 */

static tmsize_t TIFFReadEncodedStripGetStripSize(TIFF* tif, uint32 strip, uint16* pplane)

{

	static const char module[] = "TIFFReadEncodedStrip";

	TIFFDirectory *td = &tif->tif_dir;

	uint32 rowsperstrip;

	uint32 stripsperplane;

	uint32 stripinplane;

	uint32 rows;

	tmsize_t stripsize;

	if (!TIFFCheckRead(tif,0))

		return((tmsize_t)(-1));

	if (strip>=td->td_nstrips)

	{

		TIFFErrorExt(tif->tif_clientdata,module,

		    "%lu: Strip out of range, max %lu",(unsigned long)strip,

		    (unsigned long)td->td_nstrips);

		return((tmsize_t)(-1));

	}

	rowsperstrip=td->td_rowsperstrip;

	if (rowsperstrip>td->td_imagelength)

		rowsperstrip=td->td_imagelength;

	stripsperplane= TIFFhowmany_32_maxuint_compat(td->td_imagelength, rowsperstrip);

	stripinplane=(strip%stripsperplane);

	if( pplane ) *pplane=(uint16)(strip/stripsperplane);

	rows=td->td_imagelength-stripinplane*rowsperstrip;

	if (rows>rowsperstrip)

		rows=rowsperstrip;

	stripsize=TIFFVStripSize(tif,rows);

	if (stripsize==0)

		return((tmsize_t)(-1));

	return stripsize;

}

/*

 * Read a strip of data and decompress the specified

 * amount into the user-supplied buffer.

 */

tmsize_t

TIFFReadEncodedStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size)

{

	static const char module[] = "TIFFReadEncodedStrip";

	TIFFDirectory *td = &tif->tif_dir;

	tmsize_t stripsize;

	uint16 plane;

	stripsize=TIFFReadEncodedStripGetStripSize(tif, strip, &plane;;

	if (stripsize==((tmsize_t)(-1)))

		return((tmsize_t)(-1));

    /* shortcut to avoid an extra memcpy() */

    if( td->td_compression == COMPRESSION_NONE &&

        size!=(tmsize_t)(-1) && size >= stripsize &&

        !isMapped(tif) &&

        ((tif->tif_flags&TIFF_NOREADRAW)==0) )

    {

        if (TIFFReadRawStrip1(tif, strip, buf, stripsize, module) != stripsize)

            return ((tmsize_t)(-1));

        if (!isFillOrder(tif, td->td_fillorder) &&

            (tif->tif_flags & TIFF_NOBITREV) == 0)

            TIFFReverseBits(buf,stripsize);

        (*tif->tif_postdecode)(tif,buf,stripsize);

        return (stripsize);

    }

	if ((size!=(tmsize_t)(-1))&&(size

		stripsize=size;

	if (!TIFFFillStrip(tif,strip))

		return((tmsize_t)(-1));

	if ((*tif->tif_decodestrip)(tif,buf,stripsize,plane)<=0)

		return((tmsize_t)(-1));

	(*tif->tif_postdecode)(tif,buf,stripsize);

	return(stripsize);

}

/* Variant of TIFFReadEncodedStrip() that does 

 * * if *buf == NULL, *buf = _TIFFmalloc(bufsizetoalloc) only after TIFFFillStrip() has

 *   succeeded. This avoid excessive memory allocation in case of truncated

 *   file.

 * * calls regular TIFFReadEncodedStrip() if *buf != NULL

 */

tmsize_t

_TIFFReadEncodedStripAndAllocBuffer(TIFF* tif, uint32 strip,

                                    void **buf, tmsize_t bufsizetoalloc,

                                    tmsize_t size_to_read)

{

    tmsize_t this_stripsize;

    uint16 plane;

    if( *buf != NULL )

    {

        return TIFFReadEncodedStrip(tif, strip, *buf, size_to_read);

    }

    this_stripsize=TIFFReadEncodedStripGetStripSize(tif, strip, &plane;;

    if (this_stripsize==((tmsize_t)(-1)))

            return((tmsize_t)(-1));

    if ((size_to_read!=(tmsize_t)(-1))&&(size_to_read

            this_stripsize=size_to_read;

    if (!TIFFFillStrip(tif,strip))

            return((tmsize_t)(-1));

    *buf = _TIFFmalloc(bufsizetoalloc);

    if (*buf == NULL) {

            TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "No space for strip buffer");

            return((tmsize_t)(-1));

    }

    _TIFFmemset(*buf, 0, bufsizetoalloc);

    if ((*tif->tif_decodestrip)(tif,*buf,this_stripsize,plane)<=0)

            return((tmsize_t)(-1));

    (*tif->tif_postdecode)(tif,*buf,this_stripsize);

    return(this_stripsize);

}

static tmsize_t

TIFFReadRawStrip1(TIFF* tif, uint32 strip, void* buf, tmsize_t size,

    const char* module)

{

	TIFFDirectory *td = &tif->tif_dir;

    if (!_TIFFFillStriles( tif ))

        return ((tmsize_t)(-1));

	assert((tif->tif_flags&TIFF_NOREADRAW)==0);

	if (!isMapped(tif)) {

		tmsize_t cc;

		if (!SeekOK(tif, td->td_stripoffset[strip])) {

			TIFFErrorExt(tif->tif_clientdata, module,

			    "Seek error at scanline %lu, strip %lu",

			    (unsigned long) tif->tif_row, (unsigned long) strip);

			return ((tmsize_t)(-1));

		}

		cc = TIFFReadFile(tif, buf, size);

		if (cc != size) {

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

			TIFFErrorExt(tif->tif_clientdata, module,

		"Read error at scanline %lu; got %I64u bytes, expected %I64u",

				     (unsigned long) tif->tif_row,

				     (unsigned __int64) cc,

				     (unsigned __int64) size);

#else

			TIFFErrorExt(tif->tif_clientdata, module,

		"Read error at scanline %lu; got %llu bytes, expected %llu",

				     (unsigned long) tif->tif_row,

				     (unsigned long long) cc,

				     (unsigned long long) size);

#endif

			return ((tmsize_t)(-1));

		}

	} else {

		tmsize_t ma = 0;

		tmsize_t n;

		if ((td->td_stripoffset[strip] > (uint64)TIFF_TMSIZE_T_MAX)||

                    ((ma=(tmsize_t)td->td_stripoffset[strip])>tif->tif_size))

                {

                    n=0;

                }

                else if( ma > TIFF_TMSIZE_T_MAX - size )

                {

                    n=0;

                }

                else

                {

                    tmsize_t mb=ma+size;

                    if (mb>tif->tif_size)

                            n=tif->tif_size-ma;

                    else

                            n=size;

                }

		if (n!=size) {

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

			TIFFErrorExt(tif->tif_clientdata, module,

	"Read error at scanline %lu, strip %lu; got %I64u bytes, expected %I64u",

				     (unsigned long) tif->tif_row,

				     (unsigned long) strip,

				     (unsigned __int64) n,

				     (unsigned __int64) size);

#else

			TIFFErrorExt(tif->tif_clientdata, module,

	"Read error at scanline %lu, strip %lu; got %llu bytes, expected %llu",

				     (unsigned long) tif->tif_row,

				     (unsigned long) strip,

				     (unsigned long long) n,

				     (unsigned long long) size);

#endif

			return ((tmsize_t)(-1));

		}

		_TIFFmemcpy(buf, tif->tif_base + ma,

			    size);

	}

	return (size);

}

static tmsize_t

TIFFReadRawStripOrTile2(TIFF* tif, uint32 strip_or_tile, int is_strip,

                        tmsize_t size, const char* module)

{

        TIFFDirectory *td = &tif->tif_dir;

        assert( !isMapped(tif) );

        assert((tif->tif_flags&TIFF_NOREADRAW)==0);

        if (!SeekOK(tif, td->td_stripoffset[strip_or_tile])) {

            if( is_strip )

            {

                TIFFErrorExt(tif->tif_clientdata, module,

                    "Seek error at scanline %lu, strip %lu",

                    (unsigned long) tif->tif_row,

                    (unsigned long) strip_or_tile);

            }

            else

            {

                TIFFErrorExt(tif->tif_clientdata, module,

                    "Seek error at row %lu, col %lu, tile %lu",

                    (unsigned long) tif->tif_row,

                    (unsigned long) tif->tif_col,

                    (unsigned long) strip_or_tile);

            }

            return ((tmsize_t)(-1));

        }

        if( !TIFFReadAndRealloc( tif, size, 0, is_strip,

                                 strip_or_tile, module ) )

        {

            return ((tmsize_t)(-1));

        }

        return (size);

}

/*

 * Read a strip of data from the file.

 */

tmsize_t

TIFFReadRawStrip(TIFF* tif, uint32 strip, void* buf, tmsize_t size)

{

	static const char module[] = "TIFFReadRawStrip";

	TIFFDirectory *td = &tif->tif_dir;

	uint64 bytecount;

	tmsize_t bytecountm;

	if (!TIFFCheckRead(tif, 0))

		return ((tmsize_t)(-1));

	if (strip >= td->td_nstrips) {

		TIFFErrorExt(tif->tif_clientdata, module,

		     "%lu: Strip out of range, max %lu",

		     (unsigned long) strip,

		     (unsigned long) td->td_nstrips);

		return ((tmsize_t)(-1));

	}

	if (tif->tif_flags&TIFF_NOREADRAW)

	{

		TIFFErrorExt(tif->tif_clientdata, module,

		    "Compression scheme does not support access to raw uncompressed data");

		return ((tmsize_t)(-1));

	}

	bytecount = td->td_stripbytecount[strip];

	if ((int64)bytecount <= 0) {

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

		TIFFErrorExt(tif->tif_clientdata, module,

			     "%I64u: Invalid strip byte count, strip %lu",

			     (unsigned __int64) bytecount,

			     (unsigned long) strip);

#else

		TIFFErrorExt(tif->tif_clientdata, module,

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

			     (unsigned long long) bytecount,

			     (unsigned long) strip);

#endif

		return ((tmsize_t)(-1));

	}

	bytecountm = (tmsize_t)bytecount;

	if ((uint64)bytecountm!=bytecount) {

		TIFFErrorExt(tif->tif_clientdata, module, "Integer overflow");

		return ((tmsize_t)(-1));

	}

	if (size != (tmsize_t)(-1) && size < bytecountm)

		bytecountm = size;

	return (TIFFReadRawStrip1(tif, strip, buf, bytecountm, module));

}

/*

 * Read the specified strip and setup for decoding. The data buffer is

 * expanded, as necessary, to hold the strip's data.

 */

int

TIFFFillStrip(TIFF* tif, uint32 strip)

{

	static const char module[] = "TIFFFillStrip";

	TIFFDirectory *td = &tif->tif_dir;

        if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)

            return 0;

	if ((tif->tif_flags&TIFF_NOREADRAW)==0)

	{

		uint64 bytecount = td->td_stripbytecount[strip];

		if ((int64)bytecount <= 0) {

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

			TIFFErrorExt(tif->tif_clientdata, module,

				"Invalid strip byte count %I64u, strip %lu",

				     (unsigned __int64) bytecount,

				     (unsigned long) strip);

#else

			TIFFErrorExt(tif->tif_clientdata, module,

				"Invalid strip byte count %llu, strip %lu",

				     (unsigned long long) bytecount,

				     (unsigned long) strip);

#endif

			return (0);

		}

		/* To avoid excessive memory allocations: */

		/* Byte count should normally not be larger than a number of */

		/* times the uncompressed size plus some margin */

                if( bytecount > 1024 * 1024 )

                {

			/* 10 and 4096 are just values that could be adjusted. */

			/* Hopefully they are safe enough for all codecs */

			tmsize_t stripsize = TIFFStripSize(tif);

			if( stripsize != 0 &&

			    (bytecount - 4096) / 10 > (uint64)stripsize  )

			{

				uint64 newbytecount = (uint64)stripsize * 10 + 4096;

				if( (int64)newbytecount >= 0 )

				{

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

					TIFFWarningExt(tif->tif_clientdata, module,

					  "Too large strip byte count %I64u, strip %lu. Limiting to %I64u",

					     (unsigned __int64) bytecount,

					     (unsigned long) strip,

					     (unsigned __int64) newbytecount);

#else

					TIFFErrorExt(tif->tif_clientdata, module,

					  "Too large strip byte count %llu, strip %lu. Limiting to %llu",

					     (unsigned long long) bytecount,

					     (unsigned long) strip,

					     (unsigned long long) newbytecount);

#endif

					bytecount = newbytecount;

				}

			}

		}

		if (isMapped(tif)) {

			/*

			 * We must check for overflow, potentially causing

			 * an OOB read. Instead of simple

			 *

			 *  td->td_stripoffset[strip]+bytecount > tif->tif_size

			 *

			 * comparison (which can overflow) we do the following

			 * two comparisons:

			 */

			if (bytecount > (uint64)tif->tif_size ||

			    td->td_stripoffset[strip] > (uint64)tif->tif_size - bytecount) {

				/*

				 * This error message might seem strange, but

				 * it's what would happen if a read were done

				 * instead.

				 */

#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))

				TIFFErrorExt(tif->tif_clientdata, module,

					"Read error on strip %lu; "

					"got %I64u bytes, expected %I64u",

					(unsigned long) strip,

					(unsigned __int64) tif->tif_size - td->td_stripoffset[strip],

					(unsigned __int64) bytecount);

#else

				TIFFErrorExt(tif->tif_clientdata, module,

					"Read error on strip %lu; "

					"got %llu bytes, expected %llu",

					(unsigned long) strip,

					(unsigned long long) tif->tif_size - td->td_stripoffset[strip],

					(unsigned long long) bytecount);

#endif

				tif->tif_curstrip = NOSTRIP;

				return (0);

			}

		}

		if (isMapped(tif) &&

		    (isFillOrder(tif, td->td_fillorder)

		    || (tif->tif_flags & TIFF_NOBITREV))) {

			/*

			 * The image is mapped into memory and we either don't

			 * need to flip bits or the compression routine is

			 * going to handle this operation itself.  In this

			 * case, avoid copying the raw data and instead just

			 * reference the data from the memory mapped file

			 * image.  This assumes that the decompression

			 * routines do not modify the contents of the raw data

			 * buffer (if they try to, the application will get a

			 * fault since the file is mapped read-only).

			 */

			if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {

				_TIFFfree(tif->tif_rawdata);

				tif->tif_rawdata = NULL;

				tif->tif_rawdatasize = 0;

			}

			tif->tif_flags &= ~TIFF_MYBUFFER;

			tif->tif_rawdatasize = (tmsize_t)bytecount;

			tif->tif_rawdata = tif->tif_base + (tmsize_t)td->td_stripoffset[strip];

                        tif->tif_rawdataoff = 0;