src/tiff/tif_dirinfo.c

/* $Header$ */

/*
 * 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.
 */
static const TIFFFieldInfo tiffFieldInfo[] = {
    { TIFFTAG_SUBFILETYPE,	 1, 1, TIFF_LONG,	FIELD_SUBFILETYPE,
      TRUE,	FALSE,	"SubfileType" },
/* XXX SHORT for compatibility w/ old versions of the library */
    { TIFFTAG_SUBFILETYPE,	 1, 1, TIFF_SHORT,	FIELD_SUBFILETYPE,
      TRUE,	FALSE,	"SubfileType" },
    { TIFFTAG_OSUBFILETYPE,	 1, 1, TIFF_SHORT,	FIELD_SUBFILETYPE,
      TRUE,	FALSE,	"OldSubfileType" },
    { TIFFTAG_IMAGEWIDTH,	 1, 1, TIFF_LONG,	FIELD_IMAGEDIMENSIONS,
      FALSE,	FALSE,	"ImageWidth" },
    { TIFFTAG_IMAGEWIDTH,	 1, 1, TIFF_SHORT,	FIELD_IMAGEDIMENSIONS,
      FALSE,	FALSE,	"ImageWidth" },
    { TIFFTAG_IMAGELENGTH,	 1, 1, TIFF_LONG,	FIELD_IMAGEDIMENSIONS,
      TRUE,	FALSE,	"ImageLength" },
    { TIFFTAG_IMAGELENGTH,	 1, 1, TIFF_SHORT,	FIELD_IMAGEDIMENSIONS,
      TRUE,	FALSE,	"ImageLength" },
    { TIFFTAG_BITSPERSAMPLE,	-1,-1, TIFF_SHORT,	FIELD_BITSPERSAMPLE,
      FALSE,	FALSE,	"BitsPerSample" },
    { TIFFTAG_COMPRESSION,	-1, 1, TIFF_SHORT,	FIELD_COMPRESSION,
      FALSE,	FALSE,	"Compression" },
    { TIFFTAG_PHOTOMETRIC,	 1, 1, TIFF_SHORT,	FIELD_PHOTOMETRIC,
      FALSE,	FALSE,	"PhotometricInterpretation" },
    { TIFFTAG_THRESHHOLDING,	 1, 1, TIFF_SHORT,	FIELD_THRESHHOLDING,
      TRUE,	FALSE,	"Threshholding" },
    { TIFFTAG_CELLWIDTH,	 1, 1, TIFF_SHORT,	FIELD_IGNORE,
      TRUE,	FALSE,	"CellWidth" },
    { TIFFTAG_CELLLENGTH,	 1, 1, TIFF_SHORT,	FIELD_IGNORE,
      TRUE,	FALSE,	"CellLength" },
    { TIFFTAG_FILLORDER,	 1, 1, TIFF_SHORT,	FIELD_FILLORDER,
      FALSE,	FALSE,	"FillOrder" },
    { TIFFTAG_DOCUMENTNAME,	-1,-1, TIFF_ASCII,	FIELD_DOCUMENTNAME,
      TRUE,	FALSE,	"DocumentName" },
    { TIFFTAG_IMAGEDESCRIPTION,	-1,-1, TIFF_ASCII,	FIELD_IMAGEDESCRIPTION,
      TRUE,	FALSE,	"ImageDescription" },
    { TIFFTAG_MAKE,		-1,-1, TIFF_ASCII,	FIELD_MAKE,
      TRUE,	FALSE,	"Make" },
    { TIFFTAG_MODEL,		-1,-1, TIFF_ASCII,	FIELD_MODEL,
      TRUE,	FALSE,	"Model" },
    { TIFFTAG_STRIPOFFSETS,	-1,-1, TIFF_LONG,	FIELD_STRIPOFFSETS,
      FALSE,	FALSE,	"StripOffsets" },
    { TIFFTAG_STRIPOFFSETS,	-1,-1, TIFF_SHORT,	FIELD_STRIPOFFSETS,
      FALSE,	FALSE,	"StripOffsets" },
    { TIFFTAG_ORIENTATION,	 1, 1, TIFF_SHORT,	FIELD_ORIENTATION,
      FALSE,	FALSE,	"Orientation" },
    { TIFFTAG_SAMPLESPERPIXEL,	 1, 1, TIFF_SHORT,	FIELD_SAMPLESPERPIXEL,
      FALSE,	FALSE,	"SamplesPerPixel" },
    { TIFFTAG_ROWSPERSTRIP,	 1, 1, TIFF_LONG,	FIELD_ROWSPERSTRIP,
      FALSE,	FALSE,	"RowsPerStrip" },
    { TIFFTAG_ROWSPERSTRIP,	 1, 1, TIFF_SHORT,	FIELD_ROWSPERSTRIP,
      FALSE,	FALSE,	"RowsPerStrip" },
    { TIFFTAG_STRIPBYTECOUNTS,	-1,-1, TIFF_LONG,	FIELD_STRIPBYTECOUNTS,
      FALSE,	FALSE,	"StripByteCounts" },
    { TIFFTAG_STRIPBYTECOUNTS,	-1,-1, TIFF_SHORT,	FIELD_STRIPBYTECOUNTS,
      FALSE,	FALSE,	"StripByteCounts" },
    { TIFFTAG_MINSAMPLEVALUE,	-2,-1, TIFF_SHORT,	FIELD_MINSAMPLEVALUE,
      TRUE,	FALSE,	"MinSampleValue" },
    { TIFFTAG_MAXSAMPLEVALUE,	-2,-1, TIFF_SHORT,	FIELD_MAXSAMPLEVALUE,
      TRUE,	FALSE,	"MaxSampleValue" },
    { TIFFTAG_XRESOLUTION,	 1, 1, TIFF_RATIONAL,	FIELD_RESOLUTION,
      FALSE,	FALSE,	"XResolution" },
    { TIFFTAG_YRESOLUTION,	 1, 1, TIFF_RATIONAL,	FIELD_RESOLUTION,
      FALSE,	FALSE,	"YResolution" },
    { TIFFTAG_PLANARCONFIG,	 1, 1, TIFF_SHORT,	FIELD_PLANARCONFIG,
      FALSE,	FALSE,	"PlanarConfiguration" },
    { TIFFTAG_PAGENAME,		-1,-1, TIFF_ASCII,	FIELD_PAGENAME,
      TRUE,	FALSE,	"PageName" },
    { TIFFTAG_XPOSITION,	 1, 1, TIFF_RATIONAL,	FIELD_POSITION,
      TRUE,	FALSE,	"XPosition" },
    { TIFFTAG_YPOSITION,	 1, 1, TIFF_RATIONAL,	FIELD_POSITION,
      TRUE,	FALSE,	"YPosition" },
    { TIFFTAG_FREEOFFSETS,	-1,-1, TIFF_LONG,	FIELD_IGNORE,
      FALSE,	FALSE,	"FreeOffsets" },
    { TIFFTAG_FREEBYTECOUNTS,	-1,-1, TIFF_LONG,	FIELD_IGNORE,
      FALSE,	FALSE,	"FreeByteCounts" },
    { TIFFTAG_GRAYRESPONSEUNIT,	 1, 1, TIFF_SHORT,	FIELD_IGNORE,
      TRUE,	FALSE,	"GrayResponseUnit" },
    { TIFFTAG_GRAYRESPONSECURVE,-1,-1, TIFF_SHORT,	FIELD_IGNORE,
      TRUE,	FALSE,	"GrayResponseCurve" },
    { TIFFTAG_RESOLUTIONUNIT,	 1, 1, TIFF_SHORT,	FIELD_RESOLUTIONUNIT,
      FALSE,	FALSE,	"ResolutionUnit" },
    { TIFFTAG_PAGENUMBER,	 2, 2, TIFF_SHORT,	FIELD_PAGENUMBER,
      TRUE,	FALSE,	"PageNumber" },
    { TIFFTAG_COLORRESPONSEUNIT, 1, 1, TIFF_SHORT,	FIELD_IGNORE,
      TRUE,	FALSE,	"ColorResponseUnit" },
#ifdef COLORIMETRY_SUPPORT
    { TIFFTAG_TRANSFERFUNCTION,	-1,-1, TIFF_SHORT,	FIELD_TRANSFERFUNCTION,
      TRUE,	FALSE,	"TransferFunction" },
#endif
    { TIFFTAG_SOFTWARE,		-1,-1, TIFF_ASCII,	FIELD_SOFTWARE,
      TRUE,	FALSE,	"Software" },
    { TIFFTAG_DATETIME,		20,20, TIFF_ASCII,	FIELD_DATETIME,
      TRUE,	FALSE,	"DateTime" },
    { TIFFTAG_ARTIST,		-1,-1, TIFF_ASCII,	FIELD_ARTIST,
      TRUE,	FALSE,	"Artist" },
    { TIFFTAG_HOSTCOMPUTER,	-1,-1, TIFF_ASCII,	FIELD_HOSTCOMPUTER,
      TRUE,	FALSE,	"HostComputer" },
#ifdef COLORIMETRY_SUPPORT
    { TIFFTAG_WHITEPOINT,	 2, 2, TIFF_RATIONAL,FIELD_WHITEPOINT,
      TRUE,	FALSE,	"WhitePoint" },
    { TIFFTAG_PRIMARYCHROMATICITIES,6,6,TIFF_RATIONAL,FIELD_PRIMARYCHROMAS,
      TRUE,	FALSE,	"PrimaryChromaticities" },
#endif
    { TIFFTAG_COLORMAP,		-1,-1, TIFF_SHORT,	FIELD_COLORMAP,
      TRUE,	FALSE,	"ColorMap" },
    { TIFFTAG_HALFTONEHINTS,	 2, 2, TIFF_SHORT,	FIELD_HALFTONEHINTS,
      TRUE,	FALSE,	"HalftoneHints" },
    { TIFFTAG_TILEWIDTH,	 1, 1, TIFF_LONG,	FIELD_TILEDIMENSIONS,
      FALSE,	FALSE,	"TileWidth" },
    { TIFFTAG_TILEWIDTH,	 1, 1, TIFF_SHORT,	FIELD_TILEDIMENSIONS,
      FALSE,	FALSE,	"TileWidth" },
    { TIFFTAG_TILELENGTH,	 1, 1, TIFF_LONG,	FIELD_TILEDIMENSIONS,
      FALSE,	FALSE,	"TileLength" },
    { TIFFTAG_TILELENGTH,	 1, 1, TIFF_SHORT,	FIELD_TILEDIMENSIONS,
      FALSE,	FALSE,	"TileLength" },
    { TIFFTAG_TILEOFFSETS,	-1, 1, TIFF_LONG,	FIELD_STRIPOFFSETS,
      FALSE,	FALSE,	"TileOffsets" },
    { TIFFTAG_TILEBYTECOUNTS,	-1, 1, TIFF_LONG,	FIELD_STRIPBYTECOUNTS,
      FALSE,	FALSE,	"TileByteCounts" },
    { TIFFTAG_TILEBYTECOUNTS,	-1, 1, TIFF_SHORT,	FIELD_STRIPBYTECOUNTS,
      FALSE,	FALSE,	"TileByteCounts" },
#ifdef TIFFTAG_SUBIFD
    { TIFFTAG_SUBIFD,		-1,-1, TIFF_LONG,	FIELD_SUBIFD,
      TRUE,	TRUE,	"SubIFD" },
#endif
#ifdef CMYK_SUPPORT		/* 6.0 CMYK tags */
    { TIFFTAG_INKSET,		 1, 1, TIFF_SHORT,	FIELD_INKSET,
      FALSE,	FALSE,	"InkSet" },
    { TIFFTAG_INKNAMES,		-1,-1, TIFF_ASCII,	FIELD_INKNAMES,
      TRUE,	TRUE,	"InkNames" },
    { TIFFTAG_NUMBEROFINKS,	 1, 1, TIFF_SHORT,	FIELD_NUMBEROFINKS,
      TRUE,	FALSE,	"NumberOfInks" },
    { TIFFTAG_DOTRANGE,		 2, 2, TIFF_SHORT,	FIELD_DOTRANGE,
      FALSE,	FALSE,	"DotRange" },
    { TIFFTAG_DOTRANGE,		 2, 2, TIFF_BYTE,	FIELD_DOTRANGE,
      FALSE,	FALSE,	"DotRange" },
    { TIFFTAG_TARGETPRINTER,	-1,-1, TIFF_ASCII,	FIELD_TARGETPRINTER,
      TRUE,	FALSE,	"TargetPrinter" },
#endif
    { TIFFTAG_EXTRASAMPLES,	-1,-1, TIFF_SHORT,	FIELD_EXTRASAMPLES,
      FALSE,	FALSE,	"ExtraSamples" },
/* XXX for bogus Adobe Photoshop v2.5 files */
    { TIFFTAG_EXTRASAMPLES,	-1,-1, TIFF_BYTE,	FIELD_EXTRASAMPLES,
      FALSE,	FALSE,	"ExtraSamples" },
    { TIFFTAG_SAMPLEFORMAT,	-1,-1, TIFF_SHORT,	FIELD_SAMPLEFORMAT,
      FALSE,	FALSE,	"SampleFormat" },
    { TIFFTAG_SMINSAMPLEVALUE,	-2,-1, TIFF_ANY,	FIELD_SMINSAMPLEVALUE,
      TRUE,	FALSE,	"SMinSampleValue" },
    { TIFFTAG_SMAXSAMPLEVALUE,	-2,-1, TIFF_ANY,	FIELD_SMAXSAMPLEVALUE,
      TRUE,	FALSE,	"SMaxSampleValue" },
#ifdef YCBCR_SUPPORT		/* 6.0 YCbCr tags */
    { TIFFTAG_YCBCRCOEFFICIENTS, 3, 3, TIFF_RATIONAL,	FIELD_YCBCRCOEFFICIENTS,
      FALSE,	FALSE,	"YCbCrCoefficients" },
    { TIFFTAG_YCBCRSUBSAMPLING,	 2, 2, TIFF_SHORT,	FIELD_YCBCRSUBSAMPLING,
      FALSE,	FALSE,	"YCbCrSubsampling" },
    { TIFFTAG_YCBCRPOSITIONING,	 1, 1, TIFF_SHORT,	FIELD_YCBCRPOSITIONING,
      FALSE,	FALSE,	"YCbCrPositioning" },
#endif
#ifdef COLORIMETRY_SUPPORT
    { TIFFTAG_REFERENCEBLACKWHITE,6,6,TIFF_RATIONAL,	FIELD_REFBLACKWHITE,
      TRUE,	FALSE,	"ReferenceBlackWhite" },
/* XXX temporarily accept LONG for backwards compatibility */
    { TIFFTAG_REFERENCEBLACKWHITE,6,6,TIFF_LONG,	FIELD_REFBLACKWHITE,
      TRUE,	FALSE,	"ReferenceBlackWhite" },
#endif
/* begin SGI tags */
    { TIFFTAG_MATTEING,		 1, 1, TIFF_SHORT,	FIELD_EXTRASAMPLES,
      FALSE,	FALSE,	"Matteing" },
    { TIFFTAG_DATATYPE,		-2,-1, TIFF_SHORT,	FIELD_SAMPLEFORMAT,
      FALSE,	FALSE,	"DataType" },
    { TIFFTAG_IMAGEDEPTH,	 1, 1, TIFF_LONG,	FIELD_IMAGEDEPTH,
      FALSE,	FALSE,	"ImageDepth" },
    { TIFFTAG_IMAGEDEPTH,	 1, 1, TIFF_SHORT,	FIELD_IMAGEDEPTH,
      FALSE,	FALSE,	"ImageDepth" },
    { TIFFTAG_TILEDEPTH,	 1, 1, TIFF_LONG,	FIELD_TILEDEPTH,
      FALSE,	FALSE,	"TileDepth" },
    { TIFFTAG_TILEDEPTH,	 1, 1, TIFF_SHORT,	FIELD_TILEDEPTH,
      FALSE,	FALSE,	"TileDepth" },
/* end SGI tags */
#ifdef IPTC_SUPPORT
#ifdef PHOTOSHOP_SUPPORT
    { TIFFTAG_RICHTIFFIPTC, -1,-1, TIFF_LONG,   FIELD_RICHTIFFIPTC,
      FALSE,    TRUE,   "RichTIFFIPTC" },
#else
    { TIFFTAG_RICHTIFFIPTC, -1,-3, TIFF_UNDEFINED, FIELD_RICHTIFFIPTC,
      FALSE,    TRUE,   "RichTIFFIPTC" },
#endif
#endif
#ifdef PHOTOSHOP_SUPPORT
    { TIFFTAG_PHOTOSHOP,    -1,-3, TIFF_UNDEFINED, FIELD_PHOTOSHOP,
      FALSE,    TRUE,   "Photoshop" },
    { TIFFTAG_PHOTOSHOP,    -1,-1, TIFF_BYTE,   FIELD_PHOTOSHOP,
      FALSE,    TRUE,   "Photoshop" },
#endif
#ifdef ICC_SUPPORT
    { TIFFTAG_ICCPROFILE,	-1,-3, TIFF_UNDEFINED,	FIELD_ICCPROFILE,
      FALSE,	TRUE,	"ICC Profile" },
#endif
    { TIFFTAG_STONITS,		 1, 1, TIFF_DOUBLE,	FIELD_STONITS,
      FALSE,	FALSE,	"StoNits" },
};
#define	N(a)	(sizeof (a) / sizeof (a[0]))

void
_TIFFSetupFieldInfo(TIFF* tif)
{
	if (tif->tif_fieldinfo) {
		_TIFFfree(tif->tif_fieldinfo);
		tif->tif_nfields = 0;
	}
	_TIFFMergeFieldInfo(tif, tiffFieldInfo, N(tiffFieldInfo));
}

static int LINKAGEMODE
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 (tb->field_type < ta->field_type ? -1 : 1);
}

void
_TIFFMergeFieldInfo(TIFF* tif, const TIFFFieldInfo info[], int n)
{
	TIFFFieldInfo** tp;
	int i;

	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*));
	}
	tp = &tif->tif_fieldinfo[tif->tif_nfields];
	for (i = 0; i < n; i++)
		tp[i] = (TIFFFieldInfo*) &info[i];	/* XXX */
	/*
	 * NB: the core tags are presumed sorted correctly.
	 */
	if (tif->tif_nfields > 0)
		qsort(tif->tif_fieldinfo, (size_t) (tif->tif_nfields += n),
		    sizeof (TIFFFieldInfo*), tagCompare);
	else
		tif->tif_nfields += n;
}

void
_TIFFPrintFieldInfo(TIFF* tif, FILE* fd)
{
	int 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"
			, 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
		);
	}
}

const int tiffDataWidth[] = {
    1,	/* nothing */
    1,	/* TIFF_BYTE */
    1,	/* TIFF_ASCII */
    2,	/* TIFF_SHORT */
    4,	/* TIFF_LONG */
    8,	/* TIFF_RATIONAL */
    1,	/* TIFF_SBYTE */
    1,	/* TIFF_UNDEFINED */
    2,	/* TIFF_SSHORT */
    4,	/* TIFF_SLONG */
    8,	/* TIFF_SRATIONAL */
    4,	/* TIFF_FLOAT */
    8,	/* TIFF_DOUBLE */
};

/*
 * Return nearest TIFFDataType to the sample type of an image.
 */
TIFFDataType
_TIFFSampleToTagType(TIFF* tif)
{
	int bps = (int) TIFFhowmany(tif->tif_dir.td_bitspersample, 8);

	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)
{
	static const TIFFFieldInfo *last = NULL;
	int i, n;

	if (last && last->field_tag == tag &&
	    (dt == TIFF_ANY || dt == last->field_type))
		return (last);
	/* NB: if table gets big, use sorted search (e.g. binary search) */
	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 (last = fip);
	}
	return ((const TIFFFieldInfo *)0);
}

#include <assert.h>
#include <stdio.h>

const TIFFFieldInfo*
_TIFFFieldWithTag(TIFF* tif, ttag_t tag)
{
	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
	if (!fip) {
		TIFFError("TIFFFieldWithTag",
		    "Internal error, unknown tag 0x%x", (u_int) tag);
		assert(fip != NULL);
		/*NOTREACHED*/
	}
	return (fip);
}
Commit	Line	Data
	1	/* $Header$ */
	2
	3	/*
	4	* Copyright (c) 1988-1997 Sam Leffler
	5	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	6	*
	7	* Permission to use, copy, modify, distribute, and sell this software and
	8	* its documentation for any purpose is hereby granted without fee, provided
	9	* that (i) the above copyright notices and this permission notice appear in
	10	* all copies of the software and related documentation, and (ii) the names of
	11	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	12	* publicity relating to the software without the specific, prior written
	13	* permission of Sam Leffler and Silicon Graphics.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	16	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	17	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	18	*
	19	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	20	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	21	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	22	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	23	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	24	* OF THIS SOFTWARE.
	25	*/
	26
	27	/*
	28	* TIFF Library.
	29	*
	30	* Core Directory Tag Support.
	31	*/
	32	#include "tiffiop.h"
	33	#include <stdlib.h>
	34
	35	/*
	36	* NB: NB: THIS ARRAY IS ASSUMED TO BE SORTED BY TAG.
	37	* If a tag can have both LONG and SHORT types
	38	* then the LONG must be placed before the SHORT for
	39	* writing to work properly.
	40	*/
	41	static const TIFFFieldInfo tiffFieldInfo[] = {
	42	{ TIFFTAG_SUBFILETYPE, 1, 1, TIFF_LONG, FIELD_SUBFILETYPE,
	43	TRUE, FALSE, "SubfileType" },
	44	/* XXX SHORT for compatibility w/ old versions of the library */
	45	{ TIFFTAG_SUBFILETYPE, 1, 1, TIFF_SHORT, FIELD_SUBFILETYPE,
	46	TRUE, FALSE, "SubfileType" },
	47	{ TIFFTAG_OSUBFILETYPE, 1, 1, TIFF_SHORT, FIELD_SUBFILETYPE,
	48	TRUE, FALSE, "OldSubfileType" },
	49	{ TIFFTAG_IMAGEWIDTH, 1, 1, TIFF_LONG, FIELD_IMAGEDIMENSIONS,
	50	FALSE, FALSE, "ImageWidth" },
	51	{ TIFFTAG_IMAGEWIDTH, 1, 1, TIFF_SHORT, FIELD_IMAGEDIMENSIONS,
	52	FALSE, FALSE, "ImageWidth" },
	53	{ TIFFTAG_IMAGELENGTH, 1, 1, TIFF_LONG, FIELD_IMAGEDIMENSIONS,
	54	TRUE, FALSE, "ImageLength" },
	55	{ TIFFTAG_IMAGELENGTH, 1, 1, TIFF_SHORT, FIELD_IMAGEDIMENSIONS,
	56	TRUE, FALSE, "ImageLength" },
	57	{ TIFFTAG_BITSPERSAMPLE, -1,-1, TIFF_SHORT, FIELD_BITSPERSAMPLE,
	58	FALSE, FALSE, "BitsPerSample" },
	59	{ TIFFTAG_COMPRESSION, -1, 1, TIFF_SHORT, FIELD_COMPRESSION,
	60	FALSE, FALSE, "Compression" },
	61	{ TIFFTAG_PHOTOMETRIC, 1, 1, TIFF_SHORT, FIELD_PHOTOMETRIC,
	62	FALSE, FALSE, "PhotometricInterpretation" },
	63	{ TIFFTAG_THRESHHOLDING, 1, 1, TIFF_SHORT, FIELD_THRESHHOLDING,
	64	TRUE, FALSE, "Threshholding" },
	65	{ TIFFTAG_CELLWIDTH, 1, 1, TIFF_SHORT, FIELD_IGNORE,
	66	TRUE, FALSE, "CellWidth" },
	67	{ TIFFTAG_CELLLENGTH, 1, 1, TIFF_SHORT, FIELD_IGNORE,
	68	TRUE, FALSE, "CellLength" },
	69	{ TIFFTAG_FILLORDER, 1, 1, TIFF_SHORT, FIELD_FILLORDER,
	70	FALSE, FALSE, "FillOrder" },
	71	{ TIFFTAG_DOCUMENTNAME, -1,-1, TIFF_ASCII, FIELD_DOCUMENTNAME,
	72	TRUE, FALSE, "DocumentName" },
	73	{ TIFFTAG_IMAGEDESCRIPTION, -1,-1, TIFF_ASCII, FIELD_IMAGEDESCRIPTION,
	74	TRUE, FALSE, "ImageDescription" },
	75	{ TIFFTAG_MAKE, -1,-1, TIFF_ASCII, FIELD_MAKE,
	76	TRUE, FALSE, "Make" },
	77	{ TIFFTAG_MODEL, -1,-1, TIFF_ASCII, FIELD_MODEL,
	78	TRUE, FALSE, "Model" },
	79	{ TIFFTAG_STRIPOFFSETS, -1,-1, TIFF_LONG, FIELD_STRIPOFFSETS,
	80	FALSE, FALSE, "StripOffsets" },
	81	{ TIFFTAG_STRIPOFFSETS, -1,-1, TIFF_SHORT, FIELD_STRIPOFFSETS,
	82	FALSE, FALSE, "StripOffsets" },
	83	{ TIFFTAG_ORIENTATION, 1, 1, TIFF_SHORT, FIELD_ORIENTATION,
	84	FALSE, FALSE, "Orientation" },
	85	{ TIFFTAG_SAMPLESPERPIXEL, 1, 1, TIFF_SHORT, FIELD_SAMPLESPERPIXEL,
	86	FALSE, FALSE, "SamplesPerPixel" },
	87	{ TIFFTAG_ROWSPERSTRIP, 1, 1, TIFF_LONG, FIELD_ROWSPERSTRIP,
	88	FALSE, FALSE, "RowsPerStrip" },
	89	{ TIFFTAG_ROWSPERSTRIP, 1, 1, TIFF_SHORT, FIELD_ROWSPERSTRIP,
	90	FALSE, FALSE, "RowsPerStrip" },
	91	{ TIFFTAG_STRIPBYTECOUNTS, -1,-1, TIFF_LONG, FIELD_STRIPBYTECOUNTS,
	92	FALSE, FALSE, "StripByteCounts" },
	93	{ TIFFTAG_STRIPBYTECOUNTS, -1,-1, TIFF_SHORT, FIELD_STRIPBYTECOUNTS,
	94	FALSE, FALSE, "StripByteCounts" },
	95	{ TIFFTAG_MINSAMPLEVALUE, -2,-1, TIFF_SHORT, FIELD_MINSAMPLEVALUE,
	96	TRUE, FALSE, "MinSampleValue" },
	97	{ TIFFTAG_MAXSAMPLEVALUE, -2,-1, TIFF_SHORT, FIELD_MAXSAMPLEVALUE,
	98	TRUE, FALSE, "MaxSampleValue" },
	99	{ TIFFTAG_XRESOLUTION, 1, 1, TIFF_RATIONAL, FIELD_RESOLUTION,
	100	FALSE, FALSE, "XResolution" },
	101	{ TIFFTAG_YRESOLUTION, 1, 1, TIFF_RATIONAL, FIELD_RESOLUTION,
	102	FALSE, FALSE, "YResolution" },
	103	{ TIFFTAG_PLANARCONFIG, 1, 1, TIFF_SHORT, FIELD_PLANARCONFIG,
	104	FALSE, FALSE, "PlanarConfiguration" },
	105	{ TIFFTAG_PAGENAME, -1,-1, TIFF_ASCII, FIELD_PAGENAME,
	106	TRUE, FALSE, "PageName" },
	107	{ TIFFTAG_XPOSITION, 1, 1, TIFF_RATIONAL, FIELD_POSITION,
	108	TRUE, FALSE, "XPosition" },
	109	{ TIFFTAG_YPOSITION, 1, 1, TIFF_RATIONAL, FIELD_POSITION,
	110	TRUE, FALSE, "YPosition" },
	111	{ TIFFTAG_FREEOFFSETS, -1,-1, TIFF_LONG, FIELD_IGNORE,
	112	FALSE, FALSE, "FreeOffsets" },
	113	{ TIFFTAG_FREEBYTECOUNTS, -1,-1, TIFF_LONG, FIELD_IGNORE,
	114	FALSE, FALSE, "FreeByteCounts" },
	115	{ TIFFTAG_GRAYRESPONSEUNIT, 1, 1, TIFF_SHORT, FIELD_IGNORE,
	116	TRUE, FALSE, "GrayResponseUnit" },
	117	{ TIFFTAG_GRAYRESPONSECURVE,-1,-1, TIFF_SHORT, FIELD_IGNORE,
	118	TRUE, FALSE, "GrayResponseCurve" },
	119	{ TIFFTAG_RESOLUTIONUNIT, 1, 1, TIFF_SHORT, FIELD_RESOLUTIONUNIT,
	120	FALSE, FALSE, "ResolutionUnit" },
	121	{ TIFFTAG_PAGENUMBER, 2, 2, TIFF_SHORT, FIELD_PAGENUMBER,
	122	TRUE, FALSE, "PageNumber" },
	123	{ TIFFTAG_COLORRESPONSEUNIT, 1, 1, TIFF_SHORT, FIELD_IGNORE,
	124	TRUE, FALSE, "ColorResponseUnit" },
	125	#ifdef COLORIMETRY_SUPPORT
	126	{ TIFFTAG_TRANSFERFUNCTION, -1,-1, TIFF_SHORT, FIELD_TRANSFERFUNCTION,
	127	TRUE, FALSE, "TransferFunction" },
	128	#endif
	129	{ TIFFTAG_SOFTWARE, -1,-1, TIFF_ASCII, FIELD_SOFTWARE,
	130	TRUE, FALSE, "Software" },
	131	{ TIFFTAG_DATETIME, 20,20, TIFF_ASCII, FIELD_DATETIME,
	132	TRUE, FALSE, "DateTime" },
	133	{ TIFFTAG_ARTIST, -1,-1, TIFF_ASCII, FIELD_ARTIST,
	134	TRUE, FALSE, "Artist" },
	135	{ TIFFTAG_HOSTCOMPUTER, -1,-1, TIFF_ASCII, FIELD_HOSTCOMPUTER,
	136	TRUE, FALSE, "HostComputer" },
	137	#ifdef COLORIMETRY_SUPPORT
	138	{ TIFFTAG_WHITEPOINT, 2, 2, TIFF_RATIONAL,FIELD_WHITEPOINT,
	139	TRUE, FALSE, "WhitePoint" },
	140	{ TIFFTAG_PRIMARYCHROMATICITIES,6,6,TIFF_RATIONAL,FIELD_PRIMARYCHROMAS,
	141	TRUE, FALSE, "PrimaryChromaticities" },
	142	#endif
	143	{ TIFFTAG_COLORMAP, -1,-1, TIFF_SHORT, FIELD_COLORMAP,
	144	TRUE, FALSE, "ColorMap" },
	145	{ TIFFTAG_HALFTONEHINTS, 2, 2, TIFF_SHORT, FIELD_HALFTONEHINTS,
	146	TRUE, FALSE, "HalftoneHints" },
	147	{ TIFFTAG_TILEWIDTH, 1, 1, TIFF_LONG, FIELD_TILEDIMENSIONS,
	148	FALSE, FALSE, "TileWidth" },
	149	{ TIFFTAG_TILEWIDTH, 1, 1, TIFF_SHORT, FIELD_TILEDIMENSIONS,
	150	FALSE, FALSE, "TileWidth" },
	151	{ TIFFTAG_TILELENGTH, 1, 1, TIFF_LONG, FIELD_TILEDIMENSIONS,
	152	FALSE, FALSE, "TileLength" },
	153	{ TIFFTAG_TILELENGTH, 1, 1, TIFF_SHORT, FIELD_TILEDIMENSIONS,
	154	FALSE, FALSE, "TileLength" },
	155	{ TIFFTAG_TILEOFFSETS, -1, 1, TIFF_LONG, FIELD_STRIPOFFSETS,
	156	FALSE, FALSE, "TileOffsets" },
	157	{ TIFFTAG_TILEBYTECOUNTS, -1, 1, TIFF_LONG, FIELD_STRIPBYTECOUNTS,
	158	FALSE, FALSE, "TileByteCounts" },
	159	{ TIFFTAG_TILEBYTECOUNTS, -1, 1, TIFF_SHORT, FIELD_STRIPBYTECOUNTS,
	160	FALSE, FALSE, "TileByteCounts" },
	161	#ifdef TIFFTAG_SUBIFD
	162	{ TIFFTAG_SUBIFD, -1,-1, TIFF_LONG, FIELD_SUBIFD,
	163	TRUE, TRUE, "SubIFD" },
	164	#endif
	165	#ifdef CMYK_SUPPORT /* 6.0 CMYK tags */
	166	{ TIFFTAG_INKSET, 1, 1, TIFF_SHORT, FIELD_INKSET,
	167	FALSE, FALSE, "InkSet" },
	168	{ TIFFTAG_INKNAMES, -1,-1, TIFF_ASCII, FIELD_INKNAMES,
	169	TRUE, TRUE, "InkNames" },
	170	{ TIFFTAG_NUMBEROFINKS, 1, 1, TIFF_SHORT, FIELD_NUMBEROFINKS,
	171	TRUE, FALSE, "NumberOfInks" },
	172	{ TIFFTAG_DOTRANGE, 2, 2, TIFF_SHORT, FIELD_DOTRANGE,
	173	FALSE, FALSE, "DotRange" },
	174	{ TIFFTAG_DOTRANGE, 2, 2, TIFF_BYTE, FIELD_DOTRANGE,
	175	FALSE, FALSE, "DotRange" },
	176	{ TIFFTAG_TARGETPRINTER, -1,-1, TIFF_ASCII, FIELD_TARGETPRINTER,
	177	TRUE, FALSE, "TargetPrinter" },
	178	#endif
	179	{ TIFFTAG_EXTRASAMPLES, -1,-1, TIFF_SHORT, FIELD_EXTRASAMPLES,
	180	FALSE, FALSE, "ExtraSamples" },
	181	/* XXX for bogus Adobe Photoshop v2.5 files */
	182	{ TIFFTAG_EXTRASAMPLES, -1,-1, TIFF_BYTE, FIELD_EXTRASAMPLES,
	183	FALSE, FALSE, "ExtraSamples" },
	184	{ TIFFTAG_SAMPLEFORMAT, -1,-1, TIFF_SHORT, FIELD_SAMPLEFORMAT,
	185	FALSE, FALSE, "SampleFormat" },
	186	{ TIFFTAG_SMINSAMPLEVALUE, -2,-1, TIFF_ANY, FIELD_SMINSAMPLEVALUE,
	187	TRUE, FALSE, "SMinSampleValue" },
	188	{ TIFFTAG_SMAXSAMPLEVALUE, -2,-1, TIFF_ANY, FIELD_SMAXSAMPLEVALUE,
	189	TRUE, FALSE, "SMaxSampleValue" },
	190	#ifdef YCBCR_SUPPORT /* 6.0 YCbCr tags */
	191	{ TIFFTAG_YCBCRCOEFFICIENTS, 3, 3, TIFF_RATIONAL, FIELD_YCBCRCOEFFICIENTS,
	192	FALSE, FALSE, "YCbCrCoefficients" },
	193	{ TIFFTAG_YCBCRSUBSAMPLING, 2, 2, TIFF_SHORT, FIELD_YCBCRSUBSAMPLING,
	194	FALSE, FALSE, "YCbCrSubsampling" },
	195	{ TIFFTAG_YCBCRPOSITIONING, 1, 1, TIFF_SHORT, FIELD_YCBCRPOSITIONING,
	196	FALSE, FALSE, "YCbCrPositioning" },
	197	#endif
	198	#ifdef COLORIMETRY_SUPPORT
	199	{ TIFFTAG_REFERENCEBLACKWHITE,6,6,TIFF_RATIONAL, FIELD_REFBLACKWHITE,
	200	TRUE, FALSE, "ReferenceBlackWhite" },
	201	/* XXX temporarily accept LONG for backwards compatibility */
	202	{ TIFFTAG_REFERENCEBLACKWHITE,6,6,TIFF_LONG, FIELD_REFBLACKWHITE,
	203	TRUE, FALSE, "ReferenceBlackWhite" },
	204	#endif
	205	/* begin SGI tags */
	206	{ TIFFTAG_MATTEING, 1, 1, TIFF_SHORT, FIELD_EXTRASAMPLES,
	207	FALSE, FALSE, "Matteing" },
	208	{ TIFFTAG_DATATYPE, -2,-1, TIFF_SHORT, FIELD_SAMPLEFORMAT,
	209	FALSE, FALSE, "DataType" },
	210	{ TIFFTAG_IMAGEDEPTH, 1, 1, TIFF_LONG, FIELD_IMAGEDEPTH,
	211	FALSE, FALSE, "ImageDepth" },
	212	{ TIFFTAG_IMAGEDEPTH, 1, 1, TIFF_SHORT, FIELD_IMAGEDEPTH,
	213	FALSE, FALSE, "ImageDepth" },
	214	{ TIFFTAG_TILEDEPTH, 1, 1, TIFF_LONG, FIELD_TILEDEPTH,
	215	FALSE, FALSE, "TileDepth" },
	216	{ TIFFTAG_TILEDEPTH, 1, 1, TIFF_SHORT, FIELD_TILEDEPTH,
	217	FALSE, FALSE, "TileDepth" },
	218	/* end SGI tags */
	219	#ifdef IPTC_SUPPORT
	220	#ifdef PHOTOSHOP_SUPPORT
	221	{ TIFFTAG_RICHTIFFIPTC, -1,-1, TIFF_LONG, FIELD_RICHTIFFIPTC,
	222	FALSE, TRUE, "RichTIFFIPTC" },
	223	#else
	224	{ TIFFTAG_RICHTIFFIPTC, -1,-3, TIFF_UNDEFINED, FIELD_RICHTIFFIPTC,
	225	FALSE, TRUE, "RichTIFFIPTC" },
	226	#endif
	227	#endif
	228	#ifdef PHOTOSHOP_SUPPORT
	229	{ TIFFTAG_PHOTOSHOP, -1,-3, TIFF_UNDEFINED, FIELD_PHOTOSHOP,
	230	FALSE, TRUE, "Photoshop" },
	231	{ TIFFTAG_PHOTOSHOP, -1,-1, TIFF_BYTE, FIELD_PHOTOSHOP,
	232	FALSE, TRUE, "Photoshop" },
	233	#endif
	234	#ifdef ICC_SUPPORT
	235	{ TIFFTAG_ICCPROFILE, -1,-3, TIFF_UNDEFINED, FIELD_ICCPROFILE,
	236	FALSE, TRUE, "ICC Profile" },
	237	#endif
	238	{ TIFFTAG_STONITS, 1, 1, TIFF_DOUBLE, FIELD_STONITS,
	239	FALSE, FALSE, "StoNits" },
	240	};
	241	#define N(a) (sizeof (a) / sizeof (a[0]))
	242
	243	void
	244	_TIFFSetupFieldInfo(TIFF* tif)
	245	{
	246	if (tif->tif_fieldinfo) {
	247	_TIFFfree(tif->tif_fieldinfo);
	248	tif->tif_nfields = 0;
	249	}
	250	_TIFFMergeFieldInfo(tif, tiffFieldInfo, N(tiffFieldInfo));
	251	}
	252
	253	static int LINKAGEMODE
	254	tagCompare(const void* a, const void* b)
	255	{
	256	const TIFFFieldInfo* ta = (const TIFFFieldInfo*) a;
	257	const TIFFFieldInfo* tb = (const TIFFFieldInfo*) b;
	258	/* NB: be careful of return values for 16-bit platforms */
	259	if (ta->field_tag != tb->field_tag)
	260	return (ta->field_tag < tb->field_tag ? -1 : 1);
	261	else
	262	return (tb->field_type < ta->field_type ? -1 : 1);
	263	}
	264
	265	void
	266	_TIFFMergeFieldInfo(TIFF* tif, const TIFFFieldInfo info[], int n)
	267	{
	268	TIFFFieldInfo** tp;
	269	int i;
	270
	271	if (tif->tif_nfields > 0) {
	272	tif->tif_fieldinfo = (TIFFFieldInfo**)
	273	_TIFFrealloc(tif->tif_fieldinfo,
	274	(tif->tif_nfields+n) * sizeof (TIFFFieldInfo*));
	275	} else {
	276	tif->tif_fieldinfo = (TIFFFieldInfo**)
	277	_TIFFmalloc(n * sizeof (TIFFFieldInfo*));
	278	}
	279	tp = &tif->tif_fieldinfo[tif->tif_nfields];
	280	for (i = 0; i < n; i++)
	281	tp[i] = (TIFFFieldInfo) &info[i]; / XXX */
	282	/*
	283	* NB: the core tags are presumed sorted correctly.
	284	*/
	285	if (tif->tif_nfields > 0)
	286	qsort(tif->tif_fieldinfo, (size_t) (tif->tif_nfields += n),
	287	sizeof (TIFFFieldInfo*), tagCompare);
	288	else
	289	tif->tif_nfields += n;
	290	}
	291
	292	void
	293	_TIFFPrintFieldInfo(TIFF* tif, FILE* fd)
	294	{
	295	int i;
	296
	297	fprintf(fd, "%s: \n", tif->tif_name);
	298	for (i = 0; i < tif->tif_nfields; i++) {
	299	const TIFFFieldInfo* fip = tif->tif_fieldinfo[i];
	300	fprintf(fd, "field[%2d] %5lu, %2d, %2d, %d, %2d, %5s, %5s, %s\n"
	301	, i
	302	, (unsigned long) fip->field_tag
	303	, fip->field_readcount, fip->field_writecount
	304	, fip->field_type
	305	, fip->field_bit
	306	, fip->field_oktochange ? "TRUE" : "FALSE"
	307	, fip->field_passcount ? "TRUE" : "FALSE"
	308	, fip->field_name
	309	);
	310	}
	311	}
	312
	313	const int tiffDataWidth[] = {
	314	1, /* nothing */
	315	1, /* TIFF_BYTE */
	316	1, /* TIFF_ASCII */
	317	2, /* TIFF_SHORT */
	318	4, /* TIFF_LONG */
	319	8, /* TIFF_RATIONAL */
	320	1, /* TIFF_SBYTE */
	321	1, /* TIFF_UNDEFINED */
	322	2, /* TIFF_SSHORT */
	323	4, /* TIFF_SLONG */
	324	8, /* TIFF_SRATIONAL */
	325	4, /* TIFF_FLOAT */
	326	8, /* TIFF_DOUBLE */
	327	};
	328
	329	/*
	330	* Return nearest TIFFDataType to the sample type of an image.
	331	*/
	332	TIFFDataType
	333	_TIFFSampleToTagType(TIFF* tif)
	334	{
	335	int bps = (int) TIFFhowmany(tif->tif_dir.td_bitspersample, 8);
	336
	337	switch (tif->tif_dir.td_sampleformat) {
	338	case SAMPLEFORMAT_IEEEFP:
	339	return (bps == 4 ? TIFF_FLOAT : TIFF_DOUBLE);
	340	case SAMPLEFORMAT_INT:
	341	return (bps <= 1 ? TIFF_SBYTE :
	342	bps <= 2 ? TIFF_SSHORT : TIFF_SLONG);
	343	case SAMPLEFORMAT_UINT:
	344	return (bps <= 1 ? TIFF_BYTE :
	345	bps <= 2 ? TIFF_SHORT : TIFF_LONG);
	346	case SAMPLEFORMAT_VOID:
	347	return (TIFF_UNDEFINED);
	348	}
	349	/NOTREACHED/
	350	return (TIFF_UNDEFINED);
	351	}
	352
	353	const TIFFFieldInfo*
	354	_TIFFFindFieldInfo(TIFF* tif, ttag_t tag, TIFFDataType dt)
	355	{
	356	static const TIFFFieldInfo *last = NULL;
	357	int i, n;
	358
	359	if (last && last->field_tag == tag &&
	360	(dt == TIFF_ANY \|\| dt == last->field_type))
	361	return (last);
	362	/* NB: if table gets big, use sorted search (e.g. binary search) */
	363	for (i = 0, n = tif->tif_nfields; i < n; i++) {
	364	const TIFFFieldInfo* fip = tif->tif_fieldinfo[i];
	365	if (fip->field_tag == tag &&
	366	(dt == TIFF_ANY \|\| fip->field_type == dt))
	367	return (last = fip);
	368	}
	369	return ((const TIFFFieldInfo *)0);
	370	}
	371
	372	#include <assert.h>
	373	#include <stdio.h>
	374
	375	const TIFFFieldInfo*
	376	_TIFFFieldWithTag(TIFF* tif, ttag_t tag)
	377	{
	378	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
	379	if (!fip) {
	380	TIFFError("TIFFFieldWithTag",
	381	"Internal error, unknown tag 0x%x", (u_int) tag);
	382	assert(fip != NULL);
	383	/NOTREACHED/
	384	}
	385	return (fip);
	386	}