First commit - moving from LuaForge to SourceForge

1 files changed, 846 insertions, 0 deletions

diff --git a/src/libtiff/tif_dirinfo.c b/src/libtiff/tif_dirinfo.c
new file mode 100644
index 0000000..0f9020b
--- /dev/null
+++ b/src/libtiff/tif_dirinfo.c
@@ -0,0 +1,846 @@
+/* $Id: tif_dirinfo.c,v 1.1 2008/10/17 06:16:07 scuri 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.
+ *
+ * Core Directory Tag Support.
+ */
+#include "tiffiop.h"
+#include <stdlib.h>
+
+/*
+ * NB: NB: THIS ARRAY IS ASSUMED TO BE SORTED BY TAG.
+ *       If a tag can have both LONG and SHORT types then the LONG must be
+ *       placed before the SHORT for writing to work properly.
+ *
+ * NOTE: The second field (field_readcount) and third field (field_writecount)
+ *       sometimes use the values TIFF_VARIABLE (-1), TIFF_VARIABLE2 (-3)
+ *       and TIFFTAG_SPP (-2). The macros should be used but would throw off 
+ *       the formatting of the code, so please interprete the -1, -2 and -3 
+ *       values accordingly.
+ */
+static const TIFFFieldInfo
+tiffFieldInfo[] = {
+    { TIFFTAG_SUBFILETYPE,	 1, 1,	TIFF_LONG,	FIELD_SUBFILETYPE,
+      1,	0,	"SubfileType" },
+/* XXX SHORT for compatibility w/ old versions of the library */
+    { TIFFTAG_SUBFILETYPE,	 1, 1,	TIFF_SHORT,	FIELD_SUBFILETYPE,
+      1,	0,	"SubfileType" },
+    { TIFFTAG_OSUBFILETYPE,	 1, 1,	TIFF_SHORT,	FIELD_SUBFILETYPE,
+      1,	0,	"OldSubfileType" },
+    { TIFFTAG_IMAGEWIDTH,	 1, 1,	TIFF_LONG,	FIELD_IMAGEDIMENSIONS,
+      0,	0,	"ImageWidth" },
+    { TIFFTAG_IMAGEWIDTH,	 1, 1,	TIFF_SHORT,	FIELD_IMAGEDIMENSIONS,
+      0,	0,	"ImageWidth" },
+    { TIFFTAG_IMAGELENGTH,	 1, 1,	TIFF_LONG,	FIELD_IMAGEDIMENSIONS,
+      1,	0,	"ImageLength" },
+    { TIFFTAG_IMAGELENGTH,	 1, 1,	TIFF_SHORT,	FIELD_IMAGEDIMENSIONS,
+      1,	0,	"ImageLength" },
+    { TIFFTAG_BITSPERSAMPLE,	-1,-1,	TIFF_SHORT,	FIELD_BITSPERSAMPLE,
+      0,	0,	"BitsPerSample" },
+/* XXX LONG for compatibility with some broken TIFF writers */
+    { TIFFTAG_BITSPERSAMPLE,	-1,-1,	TIFF_LONG,	FIELD_BITSPERSAMPLE,
+      0,	0,	"BitsPerSample" },
+    { TIFFTAG_COMPRESSION,	-1, 1,	TIFF_SHORT,	FIELD_COMPRESSION,
+      0,	0,	"Compression" },
+/* XXX LONG for compatibility with some broken TIFF writers */
+    { TIFFTAG_COMPRESSION,	-1, 1,	TIFF_LONG,	FIELD_COMPRESSION,
+      0,	0,	"Compression" },
+    { TIFFTAG_PHOTOMETRIC,	 1, 1,	TIFF_SHORT,	FIELD_PHOTOMETRIC,
+      0,	0,	"PhotometricInterpretation" },
+/* XXX LONG for compatibility with some broken TIFF writers */
+    { TIFFTAG_PHOTOMETRIC,	 1, 1,	TIFF_LONG,	FIELD_PHOTOMETRIC,
+      0,	0,	"PhotometricInterpretation" },
+    { TIFFTAG_THRESHHOLDING,	 1, 1,	TIFF_SHORT,	FIELD_THRESHHOLDING,
+      1,	0,	"Threshholding" },
+    { TIFFTAG_CELLWIDTH,	 1, 1,	TIFF_SHORT,	FIELD_IGNORE,
+      1,	0,	"CellWidth" },
+    { TIFFTAG_CELLLENGTH,	 1, 1,	TIFF_SHORT,	FIELD_IGNORE,
+      1,	0,	"CellLength" },
+    { TIFFTAG_FILLORDER,	 1, 1,	TIFF_SHORT,	FIELD_FILLORDER,
+      0,	0,	"FillOrder" },
+    { TIFFTAG_DOCUMENTNAME,	-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"DocumentName" },
+    { TIFFTAG_IMAGEDESCRIPTION,	-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"ImageDescription" },
+    { TIFFTAG_MAKE,		-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"Make" },
+    { TIFFTAG_MODEL,		-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"Model" },
+    { TIFFTAG_STRIPOFFSETS,	-1,-1,	TIFF_LONG,	FIELD_STRIPOFFSETS,
+      0,	0,	"StripOffsets" },
+    { TIFFTAG_STRIPOFFSETS,	-1,-1,	TIFF_SHORT,	FIELD_STRIPOFFSETS,
+      0,	0,	"StripOffsets" },
+    { TIFFTAG_ORIENTATION,	 1, 1,	TIFF_SHORT,	FIELD_ORIENTATION,
+      0,	0,	"Orientation" },
+    { TIFFTAG_SAMPLESPERPIXEL,	 1, 1,	TIFF_SHORT,	FIELD_SAMPLESPERPIXEL,
+      0,	0,	"SamplesPerPixel" },
+    { TIFFTAG_ROWSPERSTRIP,	 1, 1,	TIFF_LONG,	FIELD_ROWSPERSTRIP,
+      0,	0,	"RowsPerStrip" },
+    { TIFFTAG_ROWSPERSTRIP,	 1, 1,	TIFF_SHORT,	FIELD_ROWSPERSTRIP,
+      0,	0,	"RowsPerStrip" },
+    { TIFFTAG_STRIPBYTECOUNTS,	-1,-1,	TIFF_LONG,	FIELD_STRIPBYTECOUNTS,
+      0,	0,	"StripByteCounts" },
+    { TIFFTAG_STRIPBYTECOUNTS,	-1,-1,	TIFF_SHORT,	FIELD_STRIPBYTECOUNTS,
+      0,	0,	"StripByteCounts" },
+    { TIFFTAG_MINSAMPLEVALUE,	-2,-1,	TIFF_SHORT,	FIELD_MINSAMPLEVALUE,
+      1,	0,	"MinSampleValue" },
+    { TIFFTAG_MAXSAMPLEVALUE,	-2,-1,	TIFF_SHORT,	FIELD_MAXSAMPLEVALUE,
+      1,	0,	"MaxSampleValue" },
+    { TIFFTAG_XRESOLUTION,	 1, 1,	TIFF_RATIONAL,	FIELD_RESOLUTION,
+      1,	0,	"XResolution" },
+    { TIFFTAG_YRESOLUTION,	 1, 1,	TIFF_RATIONAL,	FIELD_RESOLUTION,
+      1,	0,	"YResolution" },
+    { TIFFTAG_PLANARCONFIG,	 1, 1,	TIFF_SHORT,	FIELD_PLANARCONFIG,
+      0,	0,	"PlanarConfiguration" },
+    { TIFFTAG_PAGENAME,		-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"PageName" },
+    { TIFFTAG_XPOSITION,	 1, 1,	TIFF_RATIONAL,	FIELD_POSITION,
+      1,	0,	"XPosition" },
+    { TIFFTAG_YPOSITION,	 1, 1,	TIFF_RATIONAL,	FIELD_POSITION,
+      1,	0,	"YPosition" },
+    { TIFFTAG_FREEOFFSETS,	-1,-1,	TIFF_LONG,	FIELD_IGNORE,
+      0,	0,	"FreeOffsets" },
+    { TIFFTAG_FREEBYTECOUNTS,	-1,-1,	TIFF_LONG,	FIELD_IGNORE,
+      0,	0,	"FreeByteCounts" },
+    { TIFFTAG_GRAYRESPONSEUNIT,	 1, 1,	TIFF_SHORT,	FIELD_IGNORE,
+      1,	0,	"GrayResponseUnit" },
+    { TIFFTAG_GRAYRESPONSECURVE,-1,-1,	TIFF_SHORT,	FIELD_IGNORE,
+      1,	0,	"GrayResponseCurve" },
+    { TIFFTAG_RESOLUTIONUNIT,	 1, 1,	TIFF_SHORT,	FIELD_RESOLUTIONUNIT,
+      1,	0,	"ResolutionUnit" },
+    { TIFFTAG_PAGENUMBER,	 2, 2,	TIFF_SHORT,	FIELD_PAGENUMBER,
+      1,	0,	"PageNumber" },
+    { TIFFTAG_COLORRESPONSEUNIT, 1, 1,	TIFF_SHORT,	FIELD_IGNORE,
+      1,	0,	"ColorResponseUnit" },
+    { TIFFTAG_TRANSFERFUNCTION,	-1,-1,	TIFF_SHORT,	FIELD_TRANSFERFUNCTION,
+      1,	0,	"TransferFunction" },
+    { TIFFTAG_SOFTWARE,		-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"Software" },
+    { TIFFTAG_DATETIME,		20,20,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"DateTime" },
+    { TIFFTAG_ARTIST,		-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"Artist" },
+    { TIFFTAG_HOSTCOMPUTER,	-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"HostComputer" },
+    { TIFFTAG_WHITEPOINT,	 2, 2,	TIFF_RATIONAL,	FIELD_CUSTOM,
+      1,	0,	"WhitePoint" },
+    { TIFFTAG_PRIMARYCHROMATICITIES,6,6,TIFF_RATIONAL,	FIELD_CUSTOM,
+      1,	0,	"PrimaryChromaticities" },
+    { TIFFTAG_COLORMAP,		-1,-1,	TIFF_SHORT,	FIELD_COLORMAP,
+      1,	0,	"ColorMap" },
+    { TIFFTAG_HALFTONEHINTS,	 2, 2,	TIFF_SHORT,	FIELD_HALFTONEHINTS,
+      1,	0,	"HalftoneHints" },
+    { TIFFTAG_TILEWIDTH,	 1, 1,	TIFF_LONG,	FIELD_TILEDIMENSIONS,
+      0,	0,	"TileWidth" },
+    { TIFFTAG_TILEWIDTH,	 1, 1,	TIFF_SHORT,	FIELD_TILEDIMENSIONS,
+      0,	0,	"TileWidth" },
+    { TIFFTAG_TILELENGTH,	 1, 1,	TIFF_LONG,	FIELD_TILEDIMENSIONS,
+      0,	0,	"TileLength" },
+    { TIFFTAG_TILELENGTH,	 1, 1,	TIFF_SHORT,	FIELD_TILEDIMENSIONS,
+      0,	0,	"TileLength" },
+    { TIFFTAG_TILEOFFSETS,	-1, 1,	TIFF_LONG,	FIELD_STRIPOFFSETS,
+      0,	0,	"TileOffsets" },
+    { TIFFTAG_TILEBYTECOUNTS,	-1, 1,	TIFF_LONG,	FIELD_STRIPBYTECOUNTS,
+      0,	0,	"TileByteCounts" },
+    { TIFFTAG_TILEBYTECOUNTS,	-1, 1,	TIFF_SHORT,	FIELD_STRIPBYTECOUNTS,
+      0,	0,	"TileByteCounts" },
+    { TIFFTAG_SUBIFD,		-1,-1,	TIFF_IFD,	FIELD_SUBIFD,
+      1,	1,	"SubIFD" },
+    { TIFFTAG_SUBIFD,		-1,-1,	TIFF_LONG,	FIELD_SUBIFD,
+      1,	1,	"SubIFD" },
+    { TIFFTAG_INKSET,		 1, 1,	TIFF_SHORT,	FIELD_CUSTOM,
+      0,	0,	"InkSet" },
+    { TIFFTAG_INKNAMES,		-1,-1,	TIFF_ASCII,	FIELD_INKNAMES,
+      1,	1,	"InkNames" },
+    { TIFFTAG_NUMBEROFINKS,	 1, 1,	TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"NumberOfInks" },
+    { TIFFTAG_DOTRANGE,		 2, 2,	TIFF_SHORT,	FIELD_CUSTOM,
+      0,	0,	"DotRange" },
+    { TIFFTAG_DOTRANGE,		 2, 2,	TIFF_BYTE,	FIELD_CUSTOM,
+      0,	0,	"DotRange" },
+    { TIFFTAG_TARGETPRINTER,	-1,-1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"TargetPrinter" },
+    { TIFFTAG_EXTRASAMPLES,	-1,-1,	TIFF_SHORT,	FIELD_EXTRASAMPLES,
+      0,	1,	"ExtraSamples" },
+/* XXX for bogus Adobe Photoshop v2.5 files */
+    { TIFFTAG_EXTRASAMPLES,	-1,-1,	TIFF_BYTE,	FIELD_EXTRASAMPLES,
+      0,	1,	"ExtraSamples" },
+    { TIFFTAG_SAMPLEFORMAT,	-1,-1,	TIFF_SHORT,	FIELD_SAMPLEFORMAT,
+      0,	0,	"SampleFormat" },
+    { TIFFTAG_SMINSAMPLEVALUE,	-2,-1,	TIFF_ANY,	FIELD_SMINSAMPLEVALUE,
+      1,	0,	"SMinSampleValue" },
+    { TIFFTAG_SMAXSAMPLEVALUE,	-2,-1,	TIFF_ANY,	FIELD_SMAXSAMPLEVALUE,
+      1,	0,	"SMaxSampleValue" },
+    { TIFFTAG_CLIPPATH,		-1, -3, TIFF_BYTE,	FIELD_CUSTOM,
+      0,	1,	"ClipPath" },
+    { TIFFTAG_XCLIPPATHUNITS,	 1, 1,	TIFF_SLONG,	FIELD_CUSTOM,
+      0,	0,	"XClipPathUnits" },
+    { TIFFTAG_XCLIPPATHUNITS,	 1, 1,	TIFF_SSHORT,	FIELD_CUSTOM,
+      0,	0,	"XClipPathUnits" },
+    { TIFFTAG_XCLIPPATHUNITS,	 1, 1,	TIFF_SBYTE,	FIELD_CUSTOM,
+      0,	0,	"XClipPathUnits" },
+    { TIFFTAG_YCLIPPATHUNITS,	 1, 1,	TIFF_SLONG,	FIELD_CUSTOM,
+      0,	0,	"YClipPathUnits" },
+    { TIFFTAG_YCLIPPATHUNITS,	 1, 1,	TIFF_SSHORT,	FIELD_CUSTOM,
+      0,	0,	"YClipPathUnits" },
+    { TIFFTAG_YCLIPPATHUNITS,	 1, 1,	TIFF_SBYTE,	FIELD_CUSTOM,
+      0,	0,	"YClipPathUnits" },
+    { TIFFTAG_YCBCRCOEFFICIENTS, 3, 3,	TIFF_RATIONAL,	FIELD_CUSTOM,
+      0,	0,	"YCbCrCoefficients" },
+    { TIFFTAG_YCBCRSUBSAMPLING,	 2, 2,	TIFF_SHORT,	FIELD_YCBCRSUBSAMPLING,
+      0,	0,	"YCbCrSubsampling" },
+    { TIFFTAG_YCBCRPOSITIONING,	 1, 1,	TIFF_SHORT,	FIELD_YCBCRPOSITIONING,
+      0,	0,	"YCbCrPositioning" },
+    { TIFFTAG_REFERENCEBLACKWHITE, 6, 6, TIFF_RATIONAL,	FIELD_CUSTOM,
+      1,	0,	"ReferenceBlackWhite" },
+/* XXX temporarily accept LONG for backwards compatibility */
+    { TIFFTAG_REFERENCEBLACKWHITE, 6, 6, TIFF_LONG,	FIELD_CUSTOM,
+      1,	0,	"ReferenceBlackWhite" },
+    { TIFFTAG_XMLPACKET,	-3,-3,	TIFF_BYTE,	FIELD_CUSTOM,
+      0,	1,	"XMLPacket" },
+/* begin SGI tags */
+    { TIFFTAG_MATTEING,		 1, 1,	TIFF_SHORT,	FIELD_EXTRASAMPLES,
+      0,	0,	"Matteing" },
+    { TIFFTAG_DATATYPE,		-2,-1,	TIFF_SHORT,	FIELD_SAMPLEFORMAT,
+      0,	0,	"DataType" },
+    { TIFFTAG_IMAGEDEPTH,	 1, 1,	TIFF_LONG,	FIELD_IMAGEDEPTH,
+      0,	0,	"ImageDepth" },
+    { TIFFTAG_IMAGEDEPTH,	 1, 1,	TIFF_SHORT,	FIELD_IMAGEDEPTH,
+      0,	0,	"ImageDepth" },
+    { TIFFTAG_TILEDEPTH,	 1, 1,	TIFF_LONG,	FIELD_TILEDEPTH,
+      0,	0,	"TileDepth" },
+    { TIFFTAG_TILEDEPTH,	 1, 1,	TIFF_SHORT,	FIELD_TILEDEPTH,
+      0,	0,	"TileDepth" },
+/* end SGI tags */
+/* begin Pixar tags */
+    { TIFFTAG_PIXAR_IMAGEFULLWIDTH,  1, 1, TIFF_LONG,	FIELD_CUSTOM,
+      1,	0,	"ImageFullWidth" },
+    { TIFFTAG_PIXAR_IMAGEFULLLENGTH, 1, 1, TIFF_LONG,	FIELD_CUSTOM,
+      1,	0,	"ImageFullLength" },
+    { TIFFTAG_PIXAR_TEXTUREFORMAT,  -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"TextureFormat" },
+    { TIFFTAG_PIXAR_WRAPMODES,	    -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"TextureWrapModes" },
+    { TIFFTAG_PIXAR_FOVCOT,	     1, 1, TIFF_FLOAT,	FIELD_CUSTOM,
+      1,	0,	"FieldOfViewCotangent" },
+    { TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN,	16,16,	TIFF_FLOAT,
+      FIELD_CUSTOM,	1,	0,	"MatrixWorldToScreen" },
+    { TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA,	16,16,	TIFF_FLOAT,
+       FIELD_CUSTOM,	1,	0,	"MatrixWorldToCamera" },
+    { TIFFTAG_COPYRIGHT,	-1, -1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"Copyright" },
+/* end Pixar tags */
+    { TIFFTAG_RICHTIFFIPTC, -3, -3,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,    1,   "RichTIFFIPTC" },
+    { TIFFTAG_PHOTOSHOP,    -3, -3,	TIFF_BYTE,	FIELD_CUSTOM, 
+      0,    1,   "Photoshop" },
+    { TIFFTAG_EXIFIFD,		1, 1,	TIFF_LONG,	FIELD_CUSTOM,
+      0,	0,	"EXIFIFDOffset" },
+    { TIFFTAG_ICCPROFILE,	-3, -3,	TIFF_UNDEFINED,	FIELD_CUSTOM,
+      0,	1,	"ICC Profile" },
+    { TIFFTAG_GPSIFD,		1, 1,	TIFF_LONG,	FIELD_CUSTOM,
+      0,	0,	"GPSIFDOffset" },
+    { TIFFTAG_STONITS,		 1, 1,	TIFF_DOUBLE,	FIELD_CUSTOM,
+      0,	0,	"StoNits" },
+    { TIFFTAG_INTEROPERABILITYIFD, 1, 1, TIFF_LONG,	FIELD_CUSTOM,
+      0,	0,	"InteroperabilityIFDOffset" },
+/* begin DNG tags */
+    { TIFFTAG_DNGVERSION,	4, 4,	TIFF_BYTE,	FIELD_CUSTOM, 
+      0,	0,	"DNGVersion" },
+    { TIFFTAG_DNGBACKWARDVERSION, 4, 4,	TIFF_BYTE,	FIELD_CUSTOM, 
+      0,	0,	"DNGBackwardVersion" },
+    { TIFFTAG_UNIQUECAMERAMODEL,    -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"UniqueCameraModel" },
+    { TIFFTAG_LOCALIZEDCAMERAMODEL, -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"LocalizedCameraModel" },
+    { TIFFTAG_LOCALIZEDCAMERAMODEL, -1, -1, TIFF_BYTE,	FIELD_CUSTOM,
+      1,	1,	"LocalizedCameraModel" },
+    { TIFFTAG_CFAPLANECOLOR,	-1, -1,	TIFF_BYTE,	FIELD_CUSTOM, 
+      0,	1,	"CFAPlaneColor" },
+    { TIFFTAG_CFALAYOUT,	1, 1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"CFALayout" },
+    { TIFFTAG_LINEARIZATIONTABLE, -1, -1, TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	1,	"LinearizationTable" },
+    { TIFFTAG_BLACKLEVELREPEATDIM, 2, 2, TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"BlackLevelRepeatDim" },
+    { TIFFTAG_BLACKLEVEL,	-1, -1,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	1,	"BlackLevel" },
+    { TIFFTAG_BLACKLEVEL,	-1, -1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	1,	"BlackLevel" },
+    { TIFFTAG_BLACKLEVEL,	-1, -1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"BlackLevel" },
+    { TIFFTAG_BLACKLEVELDELTAH,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"BlackLevelDeltaH" },
+    { TIFFTAG_BLACKLEVELDELTAV,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"BlackLevelDeltaV" },
+    { TIFFTAG_WHITELEVEL,	-2, -2,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	0,	"WhiteLevel" },
+    { TIFFTAG_WHITELEVEL,	-2, -2,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"WhiteLevel" },
+    { TIFFTAG_DEFAULTSCALE,	2, 2,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"DefaultScale" },
+    { TIFFTAG_BESTQUALITYSCALE,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"BestQualityScale" },
+    { TIFFTAG_DEFAULTCROPORIGIN,	2, 2,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropOrigin" },
+    { TIFFTAG_DEFAULTCROPORIGIN,	2, 2,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropOrigin" },
+    { TIFFTAG_DEFAULTCROPORIGIN,	2, 2,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropOrigin" },
+    { TIFFTAG_DEFAULTCROPSIZE,	2, 2,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropSize" },
+    { TIFFTAG_DEFAULTCROPSIZE,	2, 2,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropSize" },
+    { TIFFTAG_DEFAULTCROPSIZE,	2, 2,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"DefaultCropSize" },
+    { TIFFTAG_COLORMATRIX1,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"ColorMatrix1" },
+    { TIFFTAG_COLORMATRIX2,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"ColorMatrix2" },
+    { TIFFTAG_CAMERACALIBRATION1,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"CameraCalibration1" },
+    { TIFFTAG_CAMERACALIBRATION2,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"CameraCalibration2" },
+    { TIFFTAG_REDUCTIONMATRIX1,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"ReductionMatrix1" },
+    { TIFFTAG_REDUCTIONMATRIX2,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"ReductionMatrix2" },
+    { TIFFTAG_ANALOGBALANCE,	-1, -1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"AnalogBalance" },
+    { TIFFTAG_ASSHOTNEUTRAL,	-1, -1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	1,	"AsShotNeutral" },
+    { TIFFTAG_ASSHOTNEUTRAL,	-1, -1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"AsShotNeutral" },
+    { TIFFTAG_ASSHOTWHITEXY,	2, 2,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"AsShotWhiteXY" },
+    { TIFFTAG_BASELINEEXPOSURE,	1, 1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"BaselineExposure" },
+    { TIFFTAG_BASELINENOISE,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"BaselineNoise" },
+    { TIFFTAG_BASELINESHARPNESS,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"BaselineSharpness" },
+    { TIFFTAG_BAYERGREENSPLIT,	1, 1,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	0,	"BayerGreenSplit" },
+    { TIFFTAG_LINEARRESPONSELIMIT,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"LinearResponseLimit" },
+    { TIFFTAG_CAMERASERIALNUMBER,    -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"CameraSerialNumber" },
+    { TIFFTAG_LENSINFO,	4, 4,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"LensInfo" },
+    { TIFFTAG_CHROMABLURRADIUS,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"ChromaBlurRadius" },
+    { TIFFTAG_ANTIALIASSTRENGTH,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"AntiAliasStrength" },
+    { TIFFTAG_SHADOWSCALE,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      0,	0,	"ShadowScale" },
+    { TIFFTAG_DNGPRIVATEDATA,    -1, -1, TIFF_BYTE,	FIELD_CUSTOM,
+      0,	1,	"DNGPrivateData" },
+    { TIFFTAG_MAKERNOTESAFETY,	1, 1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"MakerNoteSafety" },
+    { TIFFTAG_CALIBRATIONILLUMINANT1,	1, 1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"CalibrationIlluminant1" },
+    { TIFFTAG_CALIBRATIONILLUMINANT2,	1, 1,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"CalibrationIlluminant2" },
+    { TIFFTAG_RAWDATAUNIQUEID,	16, 16,	TIFF_BYTE,	FIELD_CUSTOM, 
+      0,	0,	"RawDataUniqueID" },
+    { TIFFTAG_ORIGINALRAWFILENAME,    -1, -1, TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"OriginalRawFileName" },
+    { TIFFTAG_ORIGINALRAWFILENAME,    -1, -1, TIFF_BYTE,	FIELD_CUSTOM,
+      1,	1,	"OriginalRawFileName" },
+    { TIFFTAG_ORIGINALRAWFILEDATA,    -1, -1, TIFF_UNDEFINED,	FIELD_CUSTOM,
+      0,	1,	"OriginalRawFileData" },
+    { TIFFTAG_ACTIVEAREA,	4, 4,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	0,	"ActiveArea" },
+    { TIFFTAG_ACTIVEAREA,	4, 4,	TIFF_SHORT,	FIELD_CUSTOM, 
+      0,	0,	"ActiveArea" },
+    { TIFFTAG_MASKEDAREAS,	-1, -1,	TIFF_LONG,	FIELD_CUSTOM, 
+      0,	1,	"MaskedAreas" },
+    { TIFFTAG_ASSHOTICCPROFILE,    -1, -1, TIFF_UNDEFINED,	FIELD_CUSTOM,
+      0,	1,	"AsShotICCProfile" },
+    { TIFFTAG_ASSHOTPREPROFILEMATRIX,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"AsShotPreProfileMatrix" },
+    { TIFFTAG_CURRENTICCPROFILE,    -1, -1, TIFF_UNDEFINED,	FIELD_CUSTOM,
+      0,	1,	"CurrentICCProfile" },
+    { TIFFTAG_CURRENTPREPROFILEMATRIX,	-1, -1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      0,	1,	"CurrentPreProfileMatrix" },
+/* end DNG tags */
+};
+
+static const TIFFFieldInfo
+exifFieldInfo[] = {
+    { EXIFTAG_EXPOSURETIME,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"ExposureTime" },
+    { EXIFTAG_FNUMBER,		1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"FNumber" },
+    { EXIFTAG_EXPOSUREPROGRAM,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"ExposureProgram" },
+    { EXIFTAG_SPECTRALSENSITIVITY,    -1, -1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"SpectralSensitivity" },
+    { EXIFTAG_ISOSPEEDRATINGS,  -1, -1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	1,	"ISOSpeedRatings" },
+    { EXIFTAG_OECF,	-1, -1,			TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"OptoelectricConversionFactor" },
+    { EXIFTAG_EXIFVERSION,	4, 4,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	0,	"ExifVersion" },
+    { EXIFTAG_DATETIMEORIGINAL,	20, 20,		TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"DateTimeOriginal" },
+    { EXIFTAG_DATETIMEDIGITIZED, 20, 20,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"DateTimeDigitized" },
+    { EXIFTAG_COMPONENTSCONFIGURATION,	 4, 4,	TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	0,	"ComponentsConfiguration" },
+    { EXIFTAG_COMPRESSEDBITSPERPIXEL,	 1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM,
+      1,	0,	"CompressedBitsPerPixel" },
+    { EXIFTAG_SHUTTERSPEEDVALUE,	1, 1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"ShutterSpeedValue" },
+    { EXIFTAG_APERTUREVALUE,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"ApertureValue" },
+    { EXIFTAG_BRIGHTNESSVALUE,	1, 1,		TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"BrightnessValue" },
+    { EXIFTAG_EXPOSUREBIASVALUE,	1, 1,	TIFF_SRATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"ExposureBiasValue" },
+    { EXIFTAG_MAXAPERTUREVALUE,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"MaxApertureValue" },
+    { EXIFTAG_SUBJECTDISTANCE,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"SubjectDistance" },
+    { EXIFTAG_METERINGMODE,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"MeteringMode" },
+    { EXIFTAG_LIGHTSOURCE,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"LightSource" },
+    { EXIFTAG_FLASH,	1, 1,			TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"Flash" },
+    { EXIFTAG_FOCALLENGTH,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"FocalLength" },
+    { EXIFTAG_SUBJECTAREA,	-1, -1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	1,	"SubjectArea" },
+    { EXIFTAG_MAKERNOTE,	-1, -1,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"MakerNote" },
+    { EXIFTAG_USERCOMMENT,	-1, -1,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"UserComment" },
+    { EXIFTAG_SUBSECTIME,    -1, -1,		TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"SubSecTime" },
+    { EXIFTAG_SUBSECTIMEORIGINAL, -1, -1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"SubSecTimeOriginal" },
+    { EXIFTAG_SUBSECTIMEDIGITIZED,-1, -1,	TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"SubSecTimeDigitized" },
+    { EXIFTAG_FLASHPIXVERSION,	4, 4,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	0,	"FlashpixVersion" },
+    { EXIFTAG_PIXELXDIMENSION,	1, 1,		TIFF_LONG,	FIELD_CUSTOM,
+      1,	0,	"PixelXDimension" },
+    { EXIFTAG_PIXELXDIMENSION,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"PixelXDimension" },
+    { EXIFTAG_PIXELYDIMENSION,	1, 1,		TIFF_LONG,	FIELD_CUSTOM,
+      1,	0,	"PixelYDimension" },
+    { EXIFTAG_PIXELYDIMENSION,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"PixelYDimension" },
+    { EXIFTAG_RELATEDSOUNDFILE,	13, 13,		TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"RelatedSoundFile" },
+    { EXIFTAG_FLASHENERGY,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"FlashEnergy" },
+    { EXIFTAG_SPATIALFREQUENCYRESPONSE,	-1, -1,	TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"SpatialFrequencyResponse" },
+    { EXIFTAG_FOCALPLANEXRESOLUTION,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"FocalPlaneXResolution" },
+    { EXIFTAG_FOCALPLANEYRESOLUTION,	1, 1,	TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"FocalPlaneYResolution" },
+    { EXIFTAG_FOCALPLANERESOLUTIONUNIT,	1, 1,	TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"FocalPlaneResolutionUnit" },
+    { EXIFTAG_SUBJECTLOCATION,	2, 2,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"SubjectLocation" },
+    { EXIFTAG_EXPOSUREINDEX,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"ExposureIndex" },
+    { EXIFTAG_SENSINGMETHOD,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"SensingMethod" },
+    { EXIFTAG_FILESOURCE,	1, 1,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	0,	"FileSource" },
+    { EXIFTAG_SCENETYPE,	1, 1,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	0,	"SceneType" },
+    { EXIFTAG_CFAPATTERN,	-1, -1,		TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"CFAPattern" },
+    { EXIFTAG_CUSTOMRENDERED,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"CustomRendered" },
+    { EXIFTAG_EXPOSUREMODE,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"ExposureMode" },
+    { EXIFTAG_WHITEBALANCE,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"WhiteBalance" },
+    { EXIFTAG_DIGITALZOOMRATIO,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"DigitalZoomRatio" },
+    { EXIFTAG_FOCALLENGTHIN35MMFILM, 1, 1,	TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"FocalLengthIn35mmFilm" },
+    { EXIFTAG_SCENECAPTURETYPE,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"SceneCaptureType" },
+    { EXIFTAG_GAINCONTROL,	1, 1,		TIFF_RATIONAL,	FIELD_CUSTOM, 
+      1,	0,	"GainControl" },
+    { EXIFTAG_CONTRAST,		1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"Contrast" },
+    { EXIFTAG_SATURATION,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"Saturation" },
+    { EXIFTAG_SHARPNESS,	1, 1,		TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"Sharpness" },
+    { EXIFTAG_DEVICESETTINGDESCRIPTION,	-1, -1,	TIFF_UNDEFINED,	FIELD_CUSTOM,
+      1,	1,	"DeviceSettingDescription" },
+    { EXIFTAG_SUBJECTDISTANCERANGE, 1, 1,	TIFF_SHORT,	FIELD_CUSTOM,
+      1,	0,	"SubjectDistanceRange" },
+    { EXIFTAG_IMAGEUNIQUEID,	33, 33,		TIFF_ASCII,	FIELD_CUSTOM,
+      1,	0,	"ImageUniqueID" }
+};
+
+const TIFFFieldInfo *
+_TIFFGetFieldInfo(size_t *size)
+{
+	*size = TIFFArrayCount(tiffFieldInfo);
+	return tiffFieldInfo;
+}
+
+const TIFFFieldInfo *
+_TIFFGetExifFieldInfo(size_t *size)
+{
+	*size = TIFFArrayCount(exifFieldInfo);
+	return exifFieldInfo;
+}
+
+void
+_TIFFSetupFieldInfo(TIFF* tif, const TIFFFieldInfo info[], size_t n)
+{
+	if (tif->tif_fieldinfo) {
+		size_t  i;
+
+		for (i = 0; i < tif->tif_nfields; i++) 
+		{
+			TIFFFieldInfo *fld = tif->tif_fieldinfo[i];
+			if (fld->field_bit == FIELD_CUSTOM && 
+				strncmp("Tag ", fld->field_name, 4) == 0) {
+					_TIFFfree(fld->field_name);
+					_TIFFfree(fld);
+				}
+		}   
+      
+		_TIFFfree(tif->tif_fieldinfo);
+		tif->tif_nfields = 0;
+	}
+	_TIFFMergeFieldInfo(tif, info, n);
+}
+
+static int
+tagCompare(const void* a, const void* b)
+{
+	const TIFFFieldInfo* ta = *(const TIFFFieldInfo**) a;
+	const TIFFFieldInfo* tb = *(const TIFFFieldInfo**) b;
+	/* NB: be careful of return values for 16-bit platforms */
+	if (ta->field_tag != tb->field_tag)
+		return (ta->field_tag < tb->field_tag ? -1 : 1);
+	else
+		return ((int)tb->field_type - (int)ta->field_type);
+}
+
+static int
+tagNameCompare(const void* a, const void* b)
+{
+	const TIFFFieldInfo* ta = *(const TIFFFieldInfo**) a;
+	const TIFFFieldInfo* tb = *(const TIFFFieldInfo**) b;
+
+        return strcmp(ta->field_name, tb->field_name);
+}
+
+void
+_TIFFMergeFieldInfo(TIFF* tif, const TIFFFieldInfo info[], int n)
+{
+	TIFFFieldInfo** tp;
+	int i;
+
+        tif->tif_foundfield = NULL;
+
+	if (tif->tif_nfields > 0) {
+		tif->tif_fieldinfo = (TIFFFieldInfo**)
+		    _TIFFrealloc(tif->tif_fieldinfo,
+			(tif->tif_nfields+n) * sizeof (TIFFFieldInfo*));
+	} else {
+		tif->tif_fieldinfo = (TIFFFieldInfo**)
+		    _TIFFmalloc(n * sizeof (TIFFFieldInfo*));
+	}
+	assert(tif->tif_fieldinfo != NULL);
+	tp = tif->tif_fieldinfo + tif->tif_nfields;
+	for (i = 0; i < n; i++)
+		*tp++ = (TIFFFieldInfo*) (info + i);	/* XXX */
+
+        /* Sort the field info by tag number */
+        qsort(tif->tif_fieldinfo, tif->tif_nfields += n,
+	      sizeof (TIFFFieldInfo*), tagCompare);
+}
+
+void
+_TIFFPrintFieldInfo(TIFF* tif, FILE* fd)
+{
+	size_t i;
+
+	fprintf(fd, "%s: \n", tif->tif_name);
+	for (i = 0; i < tif->tif_nfields; i++) {
+		const TIFFFieldInfo* fip = tif->tif_fieldinfo[i];
+		fprintf(fd, "field[%2d] %5lu, %2d, %2d, %d, %2d, %5s, %5s, %s\n"
+			, (int)i
+			, (unsigned long) fip->field_tag
+			, fip->field_readcount, fip->field_writecount
+			, fip->field_type
+			, fip->field_bit
+			, fip->field_oktochange ? "TRUE" : "FALSE"
+			, fip->field_passcount ? "TRUE" : "FALSE"
+			, fip->field_name
+		);
+	}
+}
+
+/*
+ * Return size of TIFFDataType in bytes
+ */
+int
+TIFFDataWidth(TIFFDataType type)
+{
+	switch(type)
+	{
+	case 0:  /* nothing */
+	case 1:  /* TIFF_BYTE */
+	case 2:  /* TIFF_ASCII */
+	case 6:  /* TIFF_SBYTE */
+	case 7:  /* TIFF_UNDEFINED */
+		return 1;
+	case 3:  /* TIFF_SHORT */
+	case 8:  /* TIFF_SSHORT */
+		return 2;
+	case 4:  /* TIFF_LONG */
+	case 9:  /* TIFF_SLONG */
+	case 11: /* TIFF_FLOAT */
+        case 13: /* TIFF_IFD */
+		return 4;
+	case 5:  /* TIFF_RATIONAL */
+	case 10: /* TIFF_SRATIONAL */
+	case 12: /* TIFF_DOUBLE */
+		return 8;
+	default:
+		return 0; /* will return 0 for unknown types */
+	}
+}
+
+/*
+ * Return size of TIFFDataType in bytes.
+ *
+ * XXX: We need a separate function to determine the space needed
+ * to store the value. For TIFF_RATIONAL values TIFFDataWidth() returns 8,
+ * but we use 4-byte float to represent rationals.
+ */
+int
+_TIFFDataSize(TIFFDataType type)
+{
+	switch (type) {
+		case TIFF_BYTE:
+		case TIFF_SBYTE:
+		case TIFF_ASCII:
+		case TIFF_UNDEFINED:
+		    return 1;
+		case TIFF_SHORT:
+		case TIFF_SSHORT:
+		    return 2;
+		case TIFF_LONG:
+		case TIFF_SLONG:
+		case TIFF_FLOAT:
+		case TIFF_IFD:
+		case TIFF_RATIONAL:
+		case TIFF_SRATIONAL:
+		    return 4;
+		case TIFF_DOUBLE:
+		    return 8;
+		default:
+		    return 0;
+	}
+}
+
+/*
+ * Return nearest TIFFDataType to the sample type of an image.
+ */
+TIFFDataType
+_TIFFSampleToTagType(TIFF* tif)
+{
+	uint32 bps = TIFFhowmany8(tif->tif_dir.td_bitspersample);
+
+	switch (tif->tif_dir.td_sampleformat) {
+	case SAMPLEFORMAT_IEEEFP:
+		return (bps == 4 ? TIFF_FLOAT : TIFF_DOUBLE);
+	case SAMPLEFORMAT_INT:
+		return (bps <= 1 ? TIFF_SBYTE :
+		    bps <= 2 ? TIFF_SSHORT : TIFF_SLONG);
+	case SAMPLEFORMAT_UINT:
+		return (bps <= 1 ? TIFF_BYTE :
+		    bps <= 2 ? TIFF_SHORT : TIFF_LONG);
+	case SAMPLEFORMAT_VOID:
+		return (TIFF_UNDEFINED);
+	}
+	/*NOTREACHED*/
+	return (TIFF_UNDEFINED);
+}
+
+const TIFFFieldInfo*
+_TIFFFindFieldInfo(TIFF* tif, ttag_t tag, TIFFDataType dt)
+{
+	int i, n;
+
+	if (tif->tif_foundfield && tif->tif_foundfield->field_tag == tag &&
+	    (dt == TIFF_ANY || dt == tif->tif_foundfield->field_type))
+		return (tif->tif_foundfield);
+	/* NB: use sorted search (e.g. binary search) */
+	if(dt != TIFF_ANY) {
+            TIFFFieldInfo key = {0, 0, 0, TIFF_NOTYPE, 0, 0, 0, 0};
+	    TIFFFieldInfo* pkey = &key;
+	    const TIFFFieldInfo **ret;
+
+	    key.field_tag = tag;
+            key.field_type = dt;
+
+	    ret = (const TIFFFieldInfo **) bsearch(&pkey,
+						   tif->tif_fieldinfo, 
+						   tif->tif_nfields,
+						   sizeof(TIFFFieldInfo *), 
+						   tagCompare);
+	    return (ret) ? (*ret) : NULL;
+        } else for (i = 0, n = tif->tif_nfields; i < n; i++) {
+		const TIFFFieldInfo* fip = tif->tif_fieldinfo[i];
+		if (fip->field_tag == tag &&
+		    (dt == TIFF_ANY || fip->field_type == dt))
+			return (tif->tif_foundfield = fip);
+	}
+	return ((const TIFFFieldInfo *)0);
+}
+
+const TIFFFieldInfo*
+_TIFFFindFieldInfoByName(TIFF* tif, const char *field_name, TIFFDataType dt)
+{
+	int i, n;
+
+	if (tif->tif_foundfield
+	    && streq(tif->tif_foundfield->field_name, field_name)
+	    && (dt == TIFF_ANY || dt == tif->tif_foundfield->field_type))
+		return (tif->tif_foundfield);
+	/* NB: use sorted search (e.g. binary search) */
+	if(dt != TIFF_ANY) {
+            TIFFFieldInfo key = {0, 0, 0, TIFF_NOTYPE, 0, 0, 0, 0};
+	    TIFFFieldInfo* pkey = &key;
+	    const TIFFFieldInfo **ret;
+
+            key.field_name = (char *)field_name;
+            key.field_type = dt;
+
+            ret = (const TIFFFieldInfo **) lfind(&pkey,
+						 tif->tif_fieldinfo, 
+						 &tif->tif_nfields,
+						 sizeof(TIFFFieldInfo *),
+						 tagNameCompare);
+	    return (ret) ? (*ret) : NULL;
+        } else
+		for (i = 0, n = tif->tif_nfields; i < n; i++) {
+			const TIFFFieldInfo* fip = tif->tif_fieldinfo[i];
+			if (streq(fip->field_name, field_name) &&
+			    (dt == TIFF_ANY || fip->field_type == dt))
+				return (tif->tif_foundfield = fip);
+		}
+	return ((const TIFFFieldInfo *)0);
+}
+
+const TIFFFieldInfo*
+_TIFFFieldWithTag(TIFF* tif, ttag_t tag)
+{
+	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
+	if (!fip) {
+		TIFFErrorExt(tif->tif_clientdata, "TIFFFieldWithTag",
+			  "Internal error, unknown tag 0x%x",
+                          (unsigned int) tag);
+		assert(fip != NULL);
+		/*NOTREACHED*/
+	}
+	return (fip);
+}
+
+const TIFFFieldInfo*
+_TIFFFieldWithName(TIFF* tif, const char *field_name)
+{
+	const TIFFFieldInfo* fip =
+		_TIFFFindFieldInfoByName(tif, field_name, TIFF_ANY);
+	if (!fip) {
+		TIFFErrorExt(tif->tif_clientdata, "TIFFFieldWithName",
+			  "Internal error, unknown tag %s", field_name);
+		assert(fip != NULL);
+		/*NOTREACHED*/
+	}
+	return (fip);
+}
+
+const TIFFFieldInfo*
+_TIFFFindOrRegisterFieldInfo( TIFF *tif, ttag_t tag, TIFFDataType dt )
+
+{
+    const TIFFFieldInfo *fld;
+
+    fld = _TIFFFindFieldInfo( tif, tag, dt );
+    if( fld == NULL )
+    {
+        fld = _TIFFCreateAnonFieldInfo( tif, tag, dt );
+        _TIFFMergeFieldInfo( tif, fld, 1 );
+    }
+
+    return fld;
+}
+
+TIFFFieldInfo*
+_TIFFCreateAnonFieldInfo(TIFF *tif, ttag_t tag, TIFFDataType field_type)
+{
+	TIFFFieldInfo *fld;
+	(void) tif;
+
+	fld = (TIFFFieldInfo *) _TIFFmalloc(sizeof (TIFFFieldInfo));
+	if (fld == NULL)
+	    return NULL;
+	_TIFFmemset( fld, 0, sizeof(TIFFFieldInfo) );
+
+	fld->field_tag = tag;
+	fld->field_readcount = TIFF_VARIABLE;
+	fld->field_writecount = TIFF_VARIABLE;
+	fld->field_type = field_type;
+	fld->field_bit = FIELD_CUSTOM;
+	fld->field_oktochange = TRUE;
+	fld->field_passcount = TRUE;
+	fld->field_name = (char *) _TIFFmalloc(32);
+	if (fld->field_name == NULL) {
+	    _TIFFfree(fld);
+	    return NULL;
+	}
+
+	/* note that this name is a special sign to TIFFClose() and
+	 * _TIFFSetupFieldInfo() to free the field
+	 */
+	sprintf(fld->field_name, "Tag %d", (int) tag);
+
+	return fld;    
+}
+
+/* vim: set ts=8 sts=8 sw=8 noet: */