text: /*
   * 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_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_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))
  		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))
              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;
                          tif->tif_rawdataloaded = (tmsize_t) bytecount;
  
  			/* 
  			 * When we have tif_rawdata reference directly into the memory mapped file
  			 * we need to be pretty careful about how we use the rawdata.  It is not
  			 * a general purpose working buffer as it normally otherwise is.  So we
  			 * keep track of this fact to avoid using it improperly.
  			 */
  			tif->tif_flags |= TIFF_BUFFERMMAP;
  		} else {
  			/*
  			 * 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?).
  			 */
  			tmsize_t bytecountm;
  			bytecountm=(tmsize_t)bytecount;
  			if ((uint64)bytecountm!=bytecount)
  			{
  				TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
  				return(0);
  			}
  			if (bytecountm > tif->tif_rawdatasize) {
  				tif->tif_curstrip = NOSTRIP;
  				if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
  					TIFFErrorExt(tif->tif_clientdata, module,
  					    "Data buffer too small to hold strip %lu",
  					    (unsigned long) strip);
  					return (0);
  				}
  			}
  			if (tif->tif_flags&TIFF_BUFFERMMAP) {
  				tif->tif_curstrip = NOSTRIP;
  				tif->tif_rawdata = NULL;
  				tif->tif_rawdatasize = 0;
  				tif->tif_flags &= ~TIFF_BUFFERMMAP;
  			}
  
  			if( isMapped(tif) )
  			{
  				if (bytecountm > tif->tif_rawdatasize &&
  				    !TIFFReadBufferSetup(tif, 0, bytecountm))
  				{
  					return (0);
  				}
  				if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata,
  				    bytecountm, module) != bytecountm)
  				{
  					return (0);
  				}
  			}
  			else
  			{
  				if (TIFFReadRawStripOrTile2(tif, strip, 1,
  				    bytecountm, module) != bytecountm)
  				{
  					return (0);
  				}
  			}
  
  
                          tif->tif_rawdataoff = 0;
                          tif->tif_rawdataloaded = bytecountm;
                          
  			if (!isFillOrder(tif, td->td_fillorder) &&
  			    (tif->tif_flags & TIFF_NOBITREV) == 0)
  				TIFFReverseBits(tif->tif_rawdata, bytecountm);
                  }
  	}
  	return (TIFFStartStrip(tif, strip));
  }
  
  /*
   * Tile-oriented Read Support
   * Contributed by Nancy Cam (Silicon Graphics).
   */
  
  /*
   * Read and decompress a tile of data.  The
   * tile is selected by the (x,y,z,s) coordinates.
   */
  tmsize_t
  TIFFReadTile(TIFF* tif, void* buf, uint32 x, uint32 y, uint32 z, uint16 s)
  {
  	if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
  		return ((tmsize_t)(-1));
  	return (TIFFReadEncodedTile(tif,
  	    TIFFComputeTile(tif, x, y, z, s), buf, (tmsize_t)(-1)));
  }
  
  /*
   * Read a tile of data and decompress the specified
   * amount into the user-supplied buffer.
   */
  tmsize_t
  TIFFReadEncodedTile(TIFF* tif, uint32 tile, void* buf, tmsize_t size)
  {
  	static const char module[] = "TIFFReadEncodedTile";
  	TIFFDirectory *td = &tif->tif_dir;
  	tmsize_t tilesize = tif->tif_tilesize;
  
  	if (!TIFFCheckRead(tif, 1))
  		return ((tmsize_t)(-1));
  	if (tile >= td->td_nstrips) {
  		TIFFErrorExt(tif->tif_clientdata, module,
  		    "%lu: Tile out of range, max %lu",
  		    (unsigned long) tile, (unsigned long) td->td_nstrips);
  		return ((tmsize_t)(-1));
  	}
  
      /* shortcut to avoid an extra memcpy() */
      if( td->td_compression == COMPRESSION_NONE &&
          size!=(tmsize_t)(-1) && size >= tilesize &&
          !isMapped(tif) &&
          ((tif->tif_flags&TIFF_NOREADRAW)==0) )
      {
          if (TIFFReadRawTile1(tif, tile, buf, tilesize, module) != tilesize)
              return ((tmsize_t)(-1));
  
          if (!isFillOrder(tif, td->td_fillorder) &&
              (tif->tif_flags & TIFF_NOBITREV) == 0)
              TIFFReverseBits(buf,tilesize);
  
          (*tif->tif_postdecode)(tif,buf,tilesize);
          return (tilesize);
      }
  
  	if (size == (tmsize_t)(-1))
  		size = tilesize;
  	else if (size > tilesize)
  		size = tilesize;
  	if (TIFFFillTile(tif, tile) && (*tif->tif_decodetile)(tif,
  	    (uint8*) buf, size, (uint16)(tile/td->td_stripsperimage))) {
  		(*tif->tif_postdecode)(tif, (uint8*) buf, size);
  		return (size);
  	} else
  		return ((tmsize_t)(-1));
  }
  
  /* Variant of TIFFReadTile() that does 
   * * if *buf == NULL, *buf = _TIFFmalloc(bufsizetoalloc) only after TIFFFillTile() has
   *   succeeded. This avoid excessive memory allocation in case of truncated
   *   file.
   * * calls regular TIFFReadEncodedTile() if *buf != NULL
   */
  tmsize_t
  _TIFFReadTileAndAllocBuffer(TIFF* tif,
                              void **buf, tmsize_t bufsizetoalloc,
                              uint32 x, uint32 y, uint32 z, uint16 s)
  {
      if (!TIFFCheckRead(tif, 1) || !TIFFCheckTile(tif, x, y, z, s))
              return ((tmsize_t)(-1));
      return (_TIFFReadEncodedTileAndAllocBuffer(tif,
                                                 TIFFComputeTile(tif, x, y, z, s),
                                                 buf, bufsizetoalloc,
                                                 (tmsize_t)(-1)));
  }
  
  /* Variant of TIFFReadEncodedTile() that does 
   * * if *buf == NULL, *buf = _TIFFmalloc(bufsizetoalloc) only after TIFFFillTile() has
   *   succeeded. This avoid excessive memory allocation in case of truncated
   *   file.
   * * calls regular TIFFReadEncodedTile() if *buf != NULL
   */
  tmsize_t
  _TIFFReadEncodedTileAndAllocBuffer(TIFF* tif, uint32 tile,
                                      void **buf, tmsize_t bufsizetoalloc,
                                      tmsize_t size_to_read)
  {
      static const char module[] = "_TIFFReadEncodedTileAndAllocBuffer";
      TIFFDirectory *td = &tif->tif_dir;
      tmsize_t tilesize = tif->tif_tilesize;
  
      if( *buf != NULL )
      {
          return TIFFReadEncodedTile(tif, tile, *buf, size_to_read);
      }
  
      if (!TIFFCheckRead(tif, 1))
              return ((tmsize_t)(-1));
      if (tile >= td->td_nstrips) {
              TIFFErrorExt(tif->tif_clientdata, module,
                  "%lu: Tile out of range, max %lu",
                  (unsigned long) tile, (unsigned long) td->td_nstrips);
              return ((tmsize_t)(-1));
      }
  
      if (!TIFFFillTile(tif,tile))
              return((tmsize_t)(-1));
  
      *buf = _TIFFmalloc(bufsizetoalloc);
      if (*buf == NULL) {
              TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif),
                           "No space for tile buffer");
              return((tmsize_t)(-1));
      }
      _TIFFmemset(*buf, 0, bufsizetoalloc);
  
      if (size_to_read == (tmsize_t)(-1))
          size_to_read = tilesize;
      else if (size_to_read > tilesize)
          size_to_read = tilesize;
      if( (*tif->tif_decodetile)(tif,
          (uint8*) *buf, size_to_read, (uint16)(tile/td->td_stripsperimage))) {
          (*tif->tif_postdecode)(tif, (uint8*) *buf, size_to_read);
          return (size_to_read);
      } else
          return ((tmsize_t)(-1));
  }
  
  static tmsize_t
  TIFFReadRawTile1(TIFF* tif, uint32 tile, 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[tile])) {
  			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) tile);
  			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 row %lu, col %lu; got %I64u bytes, expected %I64u",
  				     (unsigned long) tif->tif_row,
  				     (unsigned long) tif->tif_col,
  				     (unsigned __int64) cc,
  				     (unsigned __int64) size);
  #else
  			TIFFErrorExt(tif->tif_clientdata, module,
  	"Read error at row %lu, col %lu; got %llu bytes, expected %llu",
  				     (unsigned long) tif->tif_row,
  				     (unsigned long) tif->tif_col,
  				     (unsigned long long) cc,
  				     (unsigned long long) size);
  #endif
  			return ((tmsize_t)(-1));
  		}
  	} else {
  		tmsize_t ma,mb;
  		tmsize_t n;
  		ma=(tmsize_t)td->td_stripoffset[tile];
  		mb=ma+size;
  		if ((td->td_stripoffset[tile] > (uint64)TIFF_TMSIZE_T_MAX)||(ma>tif->tif_size))
  			n=0;
  		else if ((mb<ma)||(mb<size)||(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 row %lu, col %lu, tile %lu; got %I64u bytes, expected %I64u",
  				     (unsigned long) tif->tif_row,
  				     (unsigned long) tif->tif_col,
  				     (unsigned long) tile,
  				     (unsigned __int64) n,
  				     (unsigned __int64) 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) tile,
  				     (unsigned long long) n,
  				     (unsigned long long) size);
  #endif
  			return ((tmsize_t)(-1));
  		}
  		_TIFFmemcpy(buf, tif->tif_base + ma, size);
  	}
  	return (size);
  }
  
  /*
   * Read a tile of data from the file.
   */
  tmsize_t
  TIFFReadRawTile(TIFF* tif, uint32 tile, void* buf, tmsize_t size)
  {
  	static const char module[] = "TIFFReadRawTile";
  	TIFFDirectory *td = &tif->tif_dir;
  	uint64 bytecount64;
  	tmsize_t bytecountm;
  
  	if (!TIFFCheckRead(tif, 1))
  		return ((tmsize_t)(-1));
  	if (tile >= td->td_nstrips) {
  		TIFFErrorExt(tif->tif_clientdata, module,
  		    "%lu: Tile out of range, max %lu",
  		    (unsigned long) tile, (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));
  	}
  	bytecount64 = td->td_stripbytecount[tile];
  	if (size != (tmsize_t)(-1) && (uint64)size < bytecount64)
  		bytecount64 = (uint64)size;
  	bytecountm = (tmsize_t)bytecount64;
  	if ((uint64)bytecountm!=bytecount64)
  	{
  		TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
  		return ((tmsize_t)(-1));
  	}
  	return (TIFFReadRawTile1(tif, tile, buf, bytecountm, module));
  }
  
  /*
   * Read the specified tile and setup for decoding. The data buffer is
   * expanded, as necessary, to hold the tile's data.
   */
  int
  TIFFFillTile(TIFF* tif, uint32 tile)
  {
  	static const char module[] = "TIFFFillTile";
  	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[tile];
  		if ((int64)bytecount <= 0) {
  #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
  			TIFFErrorExt(tif->tif_clientdata, module,
  				"%I64u: Invalid tile byte count, tile %lu",
  				     (unsigned __int64) bytecount,
  				     (unsigned long) tile);
  #else
  			TIFFErrorExt(tif->tif_clientdata, module,
  				"%llu: Invalid tile byte count, tile %lu",
  				     (unsigned long long) bytecount,
  				     (unsigned long) tile);
  #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 = TIFFTileSize(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 tile byte count %I64u, tile %lu. Limiting to %I64u",
  					     (unsigned __int64) bytecount,
  					     (unsigned long) tile,
  					     (unsigned __int64) newbytecount);
  #else
  					TIFFErrorExt(tif->tif_clientdata, module,
  					  "Too large tile byte count %llu, tile %lu. Limiting to %llu",
  					     (unsigned long long) bytecount,
  					     (unsigned long) tile,
  					     (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[tile]+bytecount > tif->tif_size
  			 *
  			 * comparison (which can overflow) we do the following
  			 * two comparisons:
  			 */
  			if (bytecount > (uint64)tif->tif_size ||
  			    td->td_stripoffset[tile] > (uint64)tif->tif_size - bytecount) {
  				tif->tif_curtile = NOTILE;
  				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[tile];
                          tif->tif_rawdataoff = 0;
                          tif->tif_rawdataloaded = (tmsize_t) bytecount;
  			tif->tif_flags |= TIFF_BUFFERMMAP;
  		} else {
  			/*
  			 * Expand raw data buffer, if needed, to hold data
  			 * tile coming from file (perhaps should set upper
  			 * bound on the size of a buffer we'll use?).
  			 */
  			tmsize_t bytecountm;
  			bytecountm=(tmsize_t)bytecount;
  			if ((uint64)bytecountm!=bytecount)
  			{
  				TIFFErrorExt(tif->tif_clientdata,module,"Integer overflow");
  				return(0);
  			}
  			if (bytecountm > tif->tif_rawdatasize) {
  				tif->tif_curtile = NOTILE;
  				if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
  					TIFFErrorExt(tif->tif_clientdata, module,
  					    "Data buffer too small to hold tile %lu",
  					    (unsigned long) tile);
  					return (0);
  				}
  			}
  			if (tif->tif_flags&TIFF_BUFFERMMAP) {
  				tif->tif_curtile = NOTILE;
  				tif->tif_rawdata = NULL;
  				tif->tif_rawdatasize = 0;
  				tif->tif_flags &= ~TIFF_BUFFERMMAP;
  			}
  
  			if( isMapped(tif) )
  			{
  				if (bytecountm > tif->tif_rawdatasize &&
  				    !TIFFReadBufferSetup(tif, 0, bytecountm))
  				{
  					return (0);
  				}
  				if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata,
  				    bytecountm, module) != bytecountm)
  				{
  					return (0);
  				}
  			}
  			else
  			{
  				if (TIFFReadRawStripOrTile2(tif, tile, 0,
  				    bytecountm, module) != bytecountm)
  				{
  					return (0);
  				}
  			}
  
  
                          tif->tif_rawdataoff = 0;
                          tif->tif_rawdataloaded = bytecountm;
                          
  			if (!isFillOrder(tif, td->td_fillorder) &&
  			    (tif->tif_flags & TIFF_NOBITREV) == 0)
  				TIFFReverseBits(tif->tif_rawdata,
                                                  tif->tif_rawdataloaded);
  		}
  	}
  	return (TIFFStartTile(tif, tile));
  }
  
  /*
   * Setup the raw data buffer in preparation for
   * reading a strip of raw data.  If the buffer
   * is specified as zero, then a buffer of appropriate
   * size is allocated by the library.  Otherwise,
   * the client must guarantee that the buffer is
   * large enough to hold any individual strip of
   * raw data.
   */
  int
  TIFFReadBufferSetup(TIFF* tif, void* bp, tmsize_t size)
  {
  	static const char module[] = "TIFFReadBufferSetup";
  
  	assert((tif->tif_flags&TIFF_NOREADRAW)==0);
  	tif->tif_flags &= ~TIFF_BUFFERMMAP;
  
  	if (tif->tif_rawdata) {
  		if (tif->tif_flags & TIFF_MYBUFFER)
  			_TIFFfree(tif->tif_rawdata);
  		tif->tif_rawdata = NULL;
  		tif->tif_rawdatasize = 0;
  	}
  	if (bp) {
  		tif->tif_rawdatasize = size;
  		tif->tif_rawdata = (uint8*) bp;
  		tif->tif_flags &= ~TIFF_MYBUFFER;
  	} else {
  		tif->tif_rawdatasize = (tmsize_t)TIFFroundup_64((uint64)size, 1024);
  		if (tif->tif_rawdatasize==0) {
  		    TIFFErrorExt(tif->tif_clientdata, module,
  				 "Invalid buffer size");
  		    return (0);
  		}
  		/* Initialize to zero to avoid uninitialized buffers in case of */
                  /* short reads (http://bugzilla.maptools.org/show_bug.cgi?id=2651) */
  		tif->tif_rawdata = (uint8*) _TIFFcalloc(1, tif->tif_rawdatasize);
  		tif->tif_flags |= TIFF_MYBUFFER;
  	}
  	if (tif->tif_rawdata == NULL) {
  		TIFFErrorExt(tif->tif_clientdata, module,
  		    "No space for data buffer at scanline %lu",
  		    (unsigned long) tif->tif_row);
  		tif->tif_rawdatasize = 0;
  		return (0);
  	}
  	return (1);
  }
  
  /*
   * Set state to appear as if a
   * strip has just been read in.
   */
  static int
  TIFFStartStrip(TIFF* tif, uint32 strip)
  {
  	TIFFDirectory *td = &tif->tif_dir;
  
          if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
              return 0;
  
  	if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
  		if (!(*tif->tif_setupdecode)(tif))
  			return (0);
  		tif->tif_flags |= TIFF_CODERSETUP;
  	}
  	tif->tif_curstrip = strip;
  	tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
          tif->tif_flags &= ~TIFF_BUF4WRITE;
  
  	if (tif->tif_flags&TIFF_NOREADRAW)
  	{
  		tif->tif_rawcp = NULL;
  		tif->tif_rawcc = 0;  
  	}
  	else
  	{
  		tif->tif_rawcp = tif->tif_rawdata;
  		if( tif->tif_rawdataloaded > 0 )
  			tif->tif_rawcc = tif->tif_rawdataloaded;
  		else
  			tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[strip];
  	}
  	return ((*tif->tif_predecode)(tif,
  			(uint16)(strip / td->td_stripsperimage)));
  }
  
  /*
   * Set state to appear as if a
   * tile has just been read in.
   */
  static int
  TIFFStartTile(TIFF* tif, uint32 tile)
  {
          static const char module[] = "TIFFStartTile";
  	TIFFDirectory *td = &tif->tif_dir;
          uint32 howmany32;
  
          if (!_TIFFFillStriles( tif ) || !tif->tif_dir.td_stripbytecount)
                  return 0;
  
  	if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
  		if (!(*tif->tif_setupdecode)(tif))
  			return (0);
  		tif->tif_flags |= TIFF_CODERSETUP;
  	}
  	tif->tif_curtile = tile;
          howmany32=TIFFhowmany_32(td->td_imagewidth, td->td_tilewidth);
          if (howmany32 == 0) {
                   TIFFErrorExt(tif->tif_clientdata,module,"Zero tiles");
                  return 0;
          }
  	tif->tif_row = (tile % howmany32) * td->td_tilelength;
          howmany32=TIFFhowmany_32(td->td_imagelength, td->td_tilelength);
          if (howmany32 == 0) {
                  TIFFErrorExt(tif->tif_clientdata,module,"Zero tiles");
                  return 0;
          }
  	tif->tif_col = (tile % howmany32) * td->td_tilewidth;
          tif->tif_flags &= ~TIFF_BUF4WRITE;
  	if (tif->tif_flags&TIFF_NOREADRAW)
  	{
  		tif->tif_rawcp = NULL;
  		tif->tif_rawcc = 0;
  	}
  	else
  	{
  		tif->tif_rawcp = tif->tif_rawdata;
  		if( tif->tif_rawdataloaded > 0 )
  			tif->tif_rawcc = tif->tif_rawdataloaded;
  		else
  			tif->tif_rawcc = (tmsize_t)td->td_stripbytecount[tile];
  	}
  	return ((*tif->tif_predecode)(tif,
  			(uint16)(tile/td->td_stripsperimage)));
  }
  
  static int
  TIFFCheckRead(TIFF* tif, int tiles)
  {
  	if (tif->tif_mode == O_WRONLY) {
  		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "File not open for reading");
  		return (0);
  	}
  	if (tiles ^ isTiled(tif)) {
  		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, tiles ?
  		    "Can not read tiles from a stripped image" :
  		    "Can not read scanlines from a tiled image");
  		return (0);
  	}
  	return (1);
  }
  
  void
  _TIFFNoPostDecode(TIFF* tif, uint8* buf, tmsize_t cc)
  {
      (void) tif; (void) buf; (void) cc;
  }
  
  void
  _TIFFSwab16BitData(TIFF* tif, uint8* buf, tmsize_t cc)
  {
      (void) tif;
      assert((cc & 1) == 0);
      TIFFSwabArrayOfShort((uint16*) buf, cc/2);
  }
  
  void
  _TIFFSwab24BitData(TIFF* tif, uint8* buf, tmsize_t cc)
  {
      (void) tif;
      assert((cc % 3) == 0);
      TIFFSwabArrayOfTriples((uint8*) buf, cc/3);
  }
  
  void
  _TIFFSwab32BitData(TIFF* tif, uint8* buf, tmsize_t cc)
  {
      (void) tif;
      assert((cc & 3) == 0);
      TIFFSwabArrayOfLong((uint32*) buf, cc/4);
  }
  
  void
  _TIFFSwab64BitData(TIFF* tif, uint8* buf, tmsize_t cc)
  {
      (void) tif;
      assert((cc & 7) == 0);
      TIFFSwabArrayOfDouble((double*) buf, cc/8);
  }
  
  /* vim: set ts=8 sts=8 sw=8 noet: */
  /*
   * Local Variables:
   * mode: c
   * c-basic-offset: 8
   * fill-column: 78
   * End:
   */
  