Ejemplo n.º 1
0
/*
 * Read the specified tile and setup for decoding. 
 * The data buffer is expanded, as necessary, to
 * hold the tile's data.
 */
static int
TIFFFillTile(TIFF* tif, ttile_t tile)
{
	static const char module[] = "TIFFFillTile";
	TIFFDirectory *td = &tif->tif_dir;
	tsize_t bytecount;

	bytecount = td->td_stripbytecount[tile];
	if (isMapped(tif) &&
	    (td->td_fillorder == tif->tif_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_flags &= ~TIFF_MYBUFFER;
		if (td->td_stripoffset[tile] + bytecount > tif->tif_size) {
			tif->tif_curtile = -1;		/* unknown state */
			return (0);
		}
		tif->tif_rawdatasize = bytecount;
		tif->tif_rawdata = tif->tif_base + td->td_stripoffset[tile];
	} 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?).
		 */
		if (bytecount > tif->tif_rawdatasize) {
			tif->tif_curtile = -1;		/* unknown state */
			if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
				TIFFError(module,
				"%s: Data buffer too small to hold tile %ld",
				    tif->tif_name, (long) tile);
				return (0);
			}
			if (!TIFFReadBufferSetup(tif, 0,
			    roundup(bytecount, 1024)))
				return (0);
		}
		if (TIFFReadRawTile1(tif, tile, (u_char *)tif->tif_rawdata,
		    bytecount, module) != bytecount)
			return (0);
		if (td->td_fillorder != tif->tif_fillorder &&
		    (tif->tif_flags & TIFF_NOBITREV) == 0)
			TIFFReverseBits(tif->tif_rawdata, bytecount);
	}
	return (TIFFStartTile(tif, tile));
}
Ejemplo n.º 2
0
/*
 * 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));
}
Ejemplo n.º 3
0
/*
 * 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, tstrip_t strip)
{
	static const char module[] = "TIFFFillStrip";
	TIFFDirectory *td = &tif->tif_dir;
	tsize_t bytecount;

	bytecount = td->td_stripbytecount[strip];
	if (bytecount <= 0) {
		TIFFError(tif->tif_name,
		    "%lu: Invalid strip byte count, strip %lu",
		    (unsigned long) bytecount, (unsigned long) strip);
		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_flags &= ~TIFF_MYBUFFER;
		if ( td->td_stripoffset[strip] + bytecount > tif->tif_size) {
			/*
			 * This error message might seem strange, but it's
			 * what would happen if a read were done instead.
			 */
			TIFFError(module,
		    "%s: Read error on strip %lu; got %lu bytes, expected %lu",
			    tif->tif_name,
			    (unsigned long) strip,
			    (unsigned long) tif->tif_size - td->td_stripoffset[strip],
			    (unsigned long) bytecount);
			tif->tif_curstrip = NOSTRIP;
			return (0);
		}
		tif->tif_rawdatasize = bytecount;
		tif->tif_rawdata = tif->tif_base + td->td_stripoffset[strip];
	} 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?).
		 */
		if (bytecount > tif->tif_rawdatasize) {
			tif->tif_curstrip = NOSTRIP;
			if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
				TIFFError(module,
				"%s: Data buffer too small to hold strip %lu",
				    tif->tif_name, (unsigned long) strip);
				return (0);
			}
			if (!TIFFReadBufferSetup(tif, 0,
			    TIFFroundup(bytecount, 1024)))
				return (0);
		}
		if (TIFFReadRawStrip1(tif, strip, (unsigned char *)tif->tif_rawdata,
		    bytecount, module) != bytecount)
			return (0);
		if (!isFillOrder(tif, td->td_fillorder) &&
		    (tif->tif_flags & TIFF_NOBITREV) == 0)
			TIFFReverseBits(tif->tif_rawdata, bytecount);
	}
	return (TIFFStartStrip(tif, strip));
}
Ejemplo n.º 4
0
/*
 * 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, ttile_t tile)
{
	static const char module[] = "TIFFFillTile";
	TIFFDirectory *td = &tif->tif_dir;

	if ((tif->tif_flags&TIFF_NOREADRAW)==0)
	{
		/*
		 * FIXME: butecount should have tsize_t type, but for now
		 * libtiff defines tsize_t as a signed 32-bit integer and we
		 * are losing ability to read arrays larger than 2^31 bytes.
		 * So we are using uint32 instead of tsize_t here.
		 */
		uint32 bytecount = td->td_stripbytecount[tile];
		if (bytecount <= 0) {
			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
			    "%lu: Invalid tile byte count, tile %lu",
			    (unsigned long) bytecount, (unsigned long) tile);
			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_flags &= ~TIFF_MYBUFFER;
			/*
			 * 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 > tif->tif_size ||
			    td->td_stripoffset[tile] > tif->tif_size - bytecount) {
				tif->tif_curtile = NOTILE;
				return (0);
			}
			tif->tif_rawdatasize = bytecount;
			tif->tif_rawdata =
				tif->tif_base + td->td_stripoffset[tile];
		} 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?).
			 */
			if (bytecount > (uint32)tif->tif_rawdatasize) {
				tif->tif_curtile = NOTILE;
				if ((tif->tif_flags & TIFF_MYBUFFER) == 0) {
					TIFFErrorExt(tif->tif_clientdata,
						     module,
				"%s: Data buffer too small to hold tile %ld",
						     tif->tif_name,
						     (long) tile);
					return (0);
				}
				if (!TIFFReadBufferSetup(tif, 0,
				    TIFFroundup(bytecount, 1024)))
					return (0);
			}
			if ((uint32)TIFFReadRawTile1(tif, tile,
				(unsigned char *)tif->tif_rawdata,
				bytecount, module) != bytecount)
				return (0);
			if (!isFillOrder(tif, td->td_fillorder) &&
			    (tif->tif_flags & TIFF_NOBITREV) == 0)
				TIFFReverseBits(tif->tif_rawdata, bytecount);
		}
	}
	return (TIFFStartTile(tif, tile));
}
Ejemplo n.º 5
0
/*
 * 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);
		}
		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;
			/*
			 * 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);
			}
			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 (!TIFFReadBufferSetup(tif, 0, bytecountm))
					return (0);
			}
			if (tif->tif_flags&TIFF_BUFFERMMAP) {
				tif->tif_curtile = NOTILE;
				if (!TIFFReadBufferSetup(tif, 0, bytecountm))
					return (0);
			}

			if (TIFFReadRawTile1(tif, tile, tif->tif_rawdata,
			    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));
}
Ejemplo n.º 6
0
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 cc, to_read;
        /* 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]; */
        if (read_ahead*2 > 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 (!TIFFReadBufferSetup(tif, 0, read_ahead*2))
                        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?
        */
        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);
        cc = TIFFReadFile(tif, tif->tif_rawdata + unused_data, to_read);

        if (cc != to_read) {
#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) to_read);
#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) to_read);
#endif
                return 0;
        }
        
        tif->tif_rawdataoff = tif->tif_rawdataoff + tif->tif_rawdataloaded - unused_data ;
        tif->tif_rawdataloaded = unused_data + to_read;

        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 )
                return TIFFStartStrip(tif, strip);
        else
                return 1;
}
Ejemplo n.º 7
0
/*
 * 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) {
			TIFFErrorExt(tif->tif_clientdata, module,
				"Invalid strip byte count " TIFF_UINT64_FORMAT ", strip %lu",
				     (TIFF_UINT64_T) bytecount,
				     (unsigned long) strip);
			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;
			/*
			 * 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.
				 */
				TIFFErrorExt(tif->tif_clientdata, module,

					"Read error on strip %lu; "
					"got " TIFF_UINT64_FORMAT " bytes, expected " TIFF_UINT64_FORMAT,
					(unsigned long) strip,
					(TIFF_UINT64_T) tif->tif_size - td->td_stripoffset[strip],
					(TIFF_UINT64_T) bytecount);
				tif->tif_curstrip = NOSTRIP;
				return (0);
			}
			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 (!TIFFReadBufferSetup(tif, 0, bytecountm))
					return (0);
			}
			if (tif->tif_flags&TIFF_BUFFERMMAP) {
				tif->tif_curstrip = NOSTRIP;
				if (!TIFFReadBufferSetup(tif, 0, bytecountm))
					return (0);
			}
			if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata,
				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));
}
Ejemplo n.º 8
0
/*
 * 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;

    _TIFFFillStriles( tif );

    if ((tif->tif_flags&TIFF_NOREADRAW)==0)
    {
        uint64 bytecount = td->td_stripbytecount[strip];
        if (bytecount <= 0) {
#if defined(__WIN32__) && defined(_MSC_VER)
            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);
        }
        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_flags &= ~TIFF_MYBUFFER;
            /*
             * 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)
                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);
            }
            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;
        } 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 (!TIFFReadBufferSetup(tif, 0, bytecountm))
                    return (0);
            }
            if (TIFFReadRawStrip1(tif, strip, tif->tif_rawdata,
                                  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));
}