/src/libtiff/libtiff/tif_aux.c

Source (jump to first uncovered line)
/*
 * Copyright (c) 1991-1997 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.
 *
 * Auxiliary Support Routines.
 */
#include "tif_predict.h"
#include "tiffiop.h"
#include <float.h>
#include <math.h>

uint32_t _TIFFMultiply32(TIFF *tif, uint32_t first, uint32_t second,
                         const char *where)
{
    if (second && first > UINT32_MAX / second)
    {
        TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
        return 0;
    }

    return first * second;
}

uint64_t _TIFFMultiply64(TIFF *tif, uint64_t first, uint64_t second,
                         const char *where)
{
    if (second && first > UINT64_MAX / second)
    {
        TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
        return 0;
    }

    return first * second;
}

tmsize_t _TIFFMultiplySSize(TIFF *tif, tmsize_t first, tmsize_t second,
                            const char *where)
{
    if (first <= 0 || second <= 0)
    {
        if (tif != NULL && where != NULL)
        {
            TIFFErrorExtR(tif, where,
                          "Invalid argument to _TIFFMultiplySSize() in %s",
                          where);
        }
        return 0;
    }

    if (first > TIFF_TMSIZE_T_MAX / second)
    {
        if (tif != NULL && where != NULL)
        {
            TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
        }
        return 0;
    }
    return first * second;
}

tmsize_t _TIFFCastUInt64ToSSize(TIFF *tif, uint64_t val, const char *module)
{
    if (val > (uint64_t)TIFF_TMSIZE_T_MAX)
    {
        if (tif != NULL && module != NULL)
        {
            TIFFErrorExtR(tif, module, "Integer overflow");
        }
        return 0;
    }
    return (tmsize_t)val;
}

void *_TIFFCheckRealloc(TIFF *tif, void *buffer, tmsize_t nmemb,
                        tmsize_t elem_size, const char *what)
{
    void *cp = NULL;
    tmsize_t count = _TIFFMultiplySSize(tif, nmemb, elem_size, NULL);
    /*
     * Check for integer overflow.
     */
    if (count != 0)
    {
        cp = _TIFFreallocExt(tif, buffer, count);
    }

    if (cp == NULL)
    {
        TIFFErrorExtR(tif, tif->tif_name,
                      "Failed to allocate memory for %s "
                      "(%" TIFF_SSIZE_FORMAT " elements of %" TIFF_SSIZE_FORMAT
                      " bytes each)",
                      what, nmemb, elem_size);
    }

    return cp;
}

void *_TIFFCheckMalloc(TIFF *tif, tmsize_t nmemb, tmsize_t elem_size,
                       const char *what)
{
    return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
}

static int TIFFDefaultTransferFunction(TIFF *tif, TIFFDirectory *td)
{
    uint16_t **tf = td->td_transferfunction;
    tmsize_t i, n, nbytes;

    tf[0] = tf[1] = tf[2] = 0;
    if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
        return 0;

    n = ((tmsize_t)1) << td->td_bitspersample;
    nbytes = n * sizeof(uint16_t);
    tf[0] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
    if (tf[0] == NULL)
        return 0;
    tf[0][0] = 0;
    for (i = 1; i < n; i++)
    {
        double t = (double)i / ((double)n - 1.);
        tf[0][i] = (uint16_t)floor(65535. * pow(t, 2.2) + .5);
    }

    if (td->td_samplesperpixel - td->td_extrasamples > 1)
    {
        tf[1] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
        if (tf[1] == NULL)
            goto bad;
        _TIFFmemcpy(tf[1], tf[0], nbytes);
        tf[2] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
        if (tf[2] == NULL)
            goto bad;
        _TIFFmemcpy(tf[2], tf[0], nbytes);
    }
    return 1;

bad:
    if (tf[0])
        _TIFFfreeExt(tif, tf[0]);
    if (tf[1])
        _TIFFfreeExt(tif, tf[1]);
    if (tf[2])
        _TIFFfreeExt(tif, tf[2]);
    tf[0] = tf[1] = tf[2] = 0;
    return 0;
}

static int TIFFDefaultRefBlackWhite(TIFF *tif, TIFFDirectory *td)
{
    int i;

    td->td_refblackwhite = (float *)_TIFFmallocExt(tif, 6 * sizeof(float));
    if (td->td_refblackwhite == NULL)
        return 0;
    if (td->td_photometric == PHOTOMETRIC_YCBCR)
    {
        /*
         * YCbCr (Class Y) images must have the ReferenceBlackWhite
         * tag set. Fix the broken images, which lacks that tag.
         */
        td->td_refblackwhite[0] = 0.0F;
        td->td_refblackwhite[1] = td->td_refblackwhite[3] =
            td->td_refblackwhite[5] = 255.0F;
        td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
    }
    else
    {
        /*
         * Assume RGB (Class R)
         */
        for (i = 0; i < 3; i++)
        {
            td->td_refblackwhite[2 * i + 0] = 0;
            td->td_refblackwhite[2 * i + 1] =
                (float)((1L << td->td_bitspersample) - 1L);
        }
    }
    return 1;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 *
 * NB:  We use the value in the directory, rather than
 *  explicit values so that defaults exist only one
 *  place in the library -- in TIFFDefaultDirectory.
 */
int TIFFVGetFieldDefaulted(TIFF *tif, uint32_t tag, va_list ap)
{
    TIFFDirectory *td = &tif->tif_dir;

    if (TIFFVGetField(tif, tag, ap))
        return (1);
    switch (tag)
    {
        case TIFFTAG_SUBFILETYPE:
            *va_arg(ap, uint32_t *) = td->td_subfiletype;
            return (1);
        case TIFFTAG_BITSPERSAMPLE:
            *va_arg(ap, uint16_t *) = td->td_bitspersample;
            return (1);
        case TIFFTAG_THRESHHOLDING:
            *va_arg(ap, uint16_t *) = td->td_threshholding;
            return (1);
        case TIFFTAG_FILLORDER:
            *va_arg(ap, uint16_t *) = td->td_fillorder;
            return (1);
        case TIFFTAG_ORIENTATION:
            *va_arg(ap, uint16_t *) = td->td_orientation;
            return (1);
        case TIFFTAG_SAMPLESPERPIXEL:
            *va_arg(ap, uint16_t *) = td->td_samplesperpixel;
            return (1);
        case TIFFTAG_ROWSPERSTRIP:
            *va_arg(ap, uint32_t *) = td->td_rowsperstrip;
            return (1);
        case TIFFTAG_MINSAMPLEVALUE:
            *va_arg(ap, uint16_t *) = td->td_minsamplevalue;
            return (1);
        case TIFFTAG_MAXSAMPLEVALUE:
        {
            uint16_t maxsamplevalue;
            /* td_bitspersample=1 is always set in TIFFDefaultDirectory().
             * Therefore, td_maxsamplevalue has to be re-calculated in
             * TIFFGetFieldDefaulted(). */
            if (td->td_bitspersample > 0)
            {
                /* This shift operation into a uint16_t limits the value to
                 * 65535 even if td_bitspersamle is > 16 */
                if (td->td_bitspersample <= 16)
                {
                    maxsamplevalue = (1 << td->td_bitspersample) -
                                     1; /* 2**(BitsPerSample) - 1 */
                }
                else
                {
                    maxsamplevalue = 65535;
                }
            }
            else
            {
                maxsamplevalue = 0;
            }
            *va_arg(ap, uint16_t *) = maxsamplevalue;
            return (1);
        }
        case TIFFTAG_PLANARCONFIG:
            *va_arg(ap, uint16_t *) = td->td_planarconfig;
            return (1);
        case TIFFTAG_RESOLUTIONUNIT:
            *va_arg(ap, uint16_t *) = td->td_resolutionunit;
            return (1);
        case TIFFTAG_PREDICTOR:
        {
            TIFFPredictorState *sp = (TIFFPredictorState *)tif->tif_data;
            if (sp == NULL)
            {
                TIFFErrorExtR(
                    tif, tif->tif_name,
                    "Cannot get \"Predictor\" tag as plugin is not configured");
                *va_arg(ap, uint16_t *) = 0;
                return 0;
            }
            *va_arg(ap, uint16_t *) = (uint16_t)sp->predictor;
            return 1;
        }
        case TIFFTAG_DOTRANGE:
            *va_arg(ap, uint16_t *) = 0;
            *va_arg(ap, uint16_t *) = (1 << td->td_bitspersample) - 1;
            return (1);
        case TIFFTAG_INKSET:
            *va_arg(ap, uint16_t *) = INKSET_CMYK;
            return 1;
        case TIFFTAG_NUMBEROFINKS:
            *va_arg(ap, uint16_t *) = 4;
            return (1);
        case TIFFTAG_EXTRASAMPLES:
            *va_arg(ap, uint16_t *) = td->td_extrasamples;
            *va_arg(ap, const uint16_t **) = td->td_sampleinfo;
            return (1);
        case TIFFTAG_MATTEING:
            *va_arg(ap, uint16_t *) =
                (td->td_extrasamples == 1 &&
                 td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
            return (1);
        case TIFFTAG_TILEDEPTH:
            *va_arg(ap, uint32_t *) = td->td_tiledepth;
            return (1);
        case TIFFTAG_DATATYPE:
            *va_arg(ap, uint16_t *) = td->td_sampleformat - 1;
            return (1);
        case TIFFTAG_SAMPLEFORMAT:
            *va_arg(ap, uint16_t *) = td->td_sampleformat;
            return (1);
        case TIFFTAG_IMAGEDEPTH:
            *va_arg(ap, uint32_t *) = td->td_imagedepth;
            return (1);
        case TIFFTAG_YCBCRCOEFFICIENTS:
        {
            /* defaults are from CCIR Recommendation 601-1 */
            static const float ycbcrcoeffs[] = {0.299f, 0.587f, 0.114f};
            *va_arg(ap, const float **) = ycbcrcoeffs;
            return 1;
        }
        case TIFFTAG_YCBCRSUBSAMPLING:
            *va_arg(ap, uint16_t *) = td->td_ycbcrsubsampling[0];
            *va_arg(ap, uint16_t *) = td->td_ycbcrsubsampling[1];
            return (1);
        case TIFFTAG_YCBCRPOSITIONING:
            *va_arg(ap, uint16_t *) = td->td_ycbcrpositioning;
            return (1);
        case TIFFTAG_WHITEPOINT:
        {
            /* TIFF 6.0 specification tells that it is no default
               value for the WhitePoint, but AdobePhotoshop TIFF
               Technical Note tells that it should be CIE D50. */
            static const float whitepoint[] = {
                D50_X0 / (D50_X0 + D50_Y0 + D50_Z0),
                D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0)};
            *va_arg(ap, const float **) = whitepoint;
            return 1;
        }
        case TIFFTAG_TRANSFERFUNCTION:
            if (!td->td_transferfunction[0] &&
                !TIFFDefaultTransferFunction(tif, td))
            {
                TIFFErrorExtR(tif, tif->tif_name,
                              "No space for \"TransferFunction\" tag");
                return (0);
            }
            *va_arg(ap, const uint16_t **) = td->td_transferfunction[0];
            if (td->td_samplesperpixel - td->td_extrasamples > 1)
            {
                *va_arg(ap, const uint16_t **) = td->td_transferfunction[1];
                *va_arg(ap, const uint16_t **) = td->td_transferfunction[2];
            }
            return (1);
        case TIFFTAG_REFERENCEBLACKWHITE:
            if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(tif, td))
                return (0);
            *va_arg(ap, const float **) = td->td_refblackwhite;
            return (1);
    }
    return 0;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 */
int TIFFGetFieldDefaulted(TIFF *tif, uint32_t tag, ...)
{
    int ok;
    va_list ap;

    va_start(ap, tag);
    ok = TIFFVGetFieldDefaulted(tif, tag, ap);
    va_end(ap);
    return (ok);
}

float _TIFFClampDoubleToFloat(double val)
{
    if (val > FLT_MAX)
        return FLT_MAX;
    if (val < -FLT_MAX)
        return -FLT_MAX;
    return (float)val;
}

uint32_t _TIFFClampDoubleToUInt32(double val)
{
    if (val < 0)
        return 0;
    if (val > 0xFFFFFFFFU || val != val)
        return 0xFFFFFFFFU;
    return (uint32_t)val;
}

int _TIFFSeekOK(TIFF *tif, toff_t off)
{
    /* Huge offsets, especially -1 / UINT64_MAX, can cause issues */
    /* See http://bugzilla.maptools.org/show_bug.cgi?id=2726 */
    return off <= (~(uint64_t)0) / 2 && TIFFSeekFile(tif, off, SEEK_SET) == off;
}

Coverage Report

Created: 2024-06-18 06:05

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright (c) 1991-1997 Sam Leffler
3		* Copyright (c) 1991-1997 Silicon Graphics, Inc.
4		*
5		* Permission to use, copy, modify, distribute, and sell this software and
6		* its documentation for any purpose is hereby granted without fee, provided
7		* that (i) the above copyright notices and this permission notice appear in
8		* all copies of the software and related documentation, and (ii) the names of
9		* Sam Leffler and Silicon Graphics may not be used in any advertising or
10		* publicity relating to the software without the specific, prior written
11		* permission of Sam Leffler and Silicon Graphics.
12		*
13		* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14		* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15		* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16		*
17		* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18		* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19		* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20		* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21		* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22		* OF THIS SOFTWARE.
23		*/
24
25		/*
26		* TIFF Library.
27		*
28		* Auxiliary Support Routines.
29		*/
30		#include "tif_predict.h"
31		#include "tiffiop.h"
32		#include <float.h>
33		#include <math.h>
34
35		uint32_t _TIFFMultiply32(TIFF *tif, uint32_t first, uint32_t second,
36		const char *where)
37	0	{
38	0	if (second && first > UINT32_MAX / second)
39	0	{
40	0	TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
41	0	return 0;
42	0	}
43
44	0	return first * second;
45	0	}
46
47		uint64_t _TIFFMultiply64(TIFF *tif, uint64_t first, uint64_t second,
48		const char *where)
49	0	{
50	0	if (second && first > UINT64_MAX / second)
51	0	{
52	0	TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
53	0	return 0;
54	0	}
55
56	0	return first * second;
57	0	}
58
59		tmsize_t _TIFFMultiplySSize(TIFF *tif, tmsize_t first, tmsize_t second,
60		const char *where)
61	0	{
62	0	if (first <= 0 \|\| second <= 0)
63	0	{
64	0	if (tif != NULL && where != NULL)
65	0	{
66	0	TIFFErrorExtR(tif, where,
67	0	"Invalid argument to _TIFFMultiplySSize() in %s",
68	0	where);
69	0	}
70	0	return 0;
71	0	}
72
73	0	if (first > TIFF_TMSIZE_T_MAX / second)
74	0	{
75	0	if (tif != NULL && where != NULL)
76	0	{
77	0	TIFFErrorExtR(tif, where, "Integer overflow in %s", where);
78	0	}
79	0	return 0;
80	0	}
81	0	return first * second;
82	0	}
83
84		tmsize_t _TIFFCastUInt64ToSSize(TIFF tif, uint64_t val, const char module)
85	0	{
86	0	if (val > (uint64_t)TIFF_TMSIZE_T_MAX)
87	0	{
88	0	if (tif != NULL && module != NULL)
89	0	{
90	0	TIFFErrorExtR(tif, module, "Integer overflow");
91	0	}
92	0	return 0;
93	0	}
94	0	return (tmsize_t)val;
95	0	}
96
97		void _TIFFCheckRealloc(TIFF tif, void *buffer, tmsize_t nmemb,
98		tmsize_t elem_size, const char *what)
99	0	{
100	0	void *cp = NULL;
101	0	tmsize_t count = _TIFFMultiplySSize(tif, nmemb, elem_size, NULL);
102		/*
103		* Check for integer overflow.
104		*/
105	0	if (count != 0)
106	0	{
107	0	cp = _TIFFreallocExt(tif, buffer, count);
108	0	}
109
110	0	if (cp == NULL)
111	0	{
112	0	TIFFErrorExtR(tif, tif->tif_name,
113	0	"Failed to allocate memory for %s "
114	0	"(%" TIFF_SSIZE_FORMAT " elements of %" TIFF_SSIZE_FORMAT
115	0	" bytes each)",
116	0	what, nmemb, elem_size);
117	0	}
118
119	0	return cp;
120	0	}
121
122		void _TIFFCheckMalloc(TIFF tif, tmsize_t nmemb, tmsize_t elem_size,
123		const char *what)
124	0	{
125	0	return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
126	0	}
127
128		static int TIFFDefaultTransferFunction(TIFF tif, TIFFDirectory td)
129	0	{
130	0	uint16_t **tf = td->td_transferfunction;
131	0	tmsize_t i, n, nbytes;
132
133	0	tf[0] = tf[1] = tf[2] = 0;
134	0	if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
135	0	return 0;
136
137	0	n = ((tmsize_t)1) << td->td_bitspersample;
138	0	nbytes = n * sizeof(uint16_t);
139	0	tf[0] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
140	0	if (tf[0] == NULL)
141	0	return 0;
142	0	tf[0][0] = 0;
143	0	for (i = 1; i < n; i++)
144	0	{
145	0	double t = (double)i / ((double)n - 1.);
146	0	tf[0][i] = (uint16_t)floor(65535. * pow(t, 2.2) + .5);
147	0	}
148
149	0	if (td->td_samplesperpixel - td->td_extrasamples > 1)
150	0	{
151	0	tf[1] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
152	0	if (tf[1] == NULL)
153	0	goto bad;
154	0	_TIFFmemcpy(tf[1], tf[0], nbytes);
155	0	tf[2] = (uint16_t *)_TIFFmallocExt(tif, nbytes);
156	0	if (tf[2] == NULL)
157	0	goto bad;
158	0	_TIFFmemcpy(tf[2], tf[0], nbytes);
159	0	}
160	0	return 1;
161
162	0	bad:
163	0	if (tf[0])
164	0	_TIFFfreeExt(tif, tf[0]);
165	0	if (tf[1])
166	0	_TIFFfreeExt(tif, tf[1]);
167	0	if (tf[2])
168	0	_TIFFfreeExt(tif, tf[2]);
169	0	tf[0] = tf[1] = tf[2] = 0;
170	0	return 0;
171	0	}
172
173		static int TIFFDefaultRefBlackWhite(TIFF tif, TIFFDirectory td)
174	0	{
175	0	int i;
176
177	0	td->td_refblackwhite = (float )_TIFFmallocExt(tif, 6 sizeof(float));
178	0	if (td->td_refblackwhite == NULL)
179	0	return 0;
180	0	if (td->td_photometric == PHOTOMETRIC_YCBCR)
181	0	{
182		/*
183		* YCbCr (Class Y) images must have the ReferenceBlackWhite
184		* tag set. Fix the broken images, which lacks that tag.
185		*/
186	0	td->td_refblackwhite[0] = 0.0F;
187	0	td->td_refblackwhite[1] = td->td_refblackwhite[3] =
188	0	td->td_refblackwhite[5] = 255.0F;
189	0	td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
190	0	}
191	0	else
192	0	{
193		/*
194		* Assume RGB (Class R)
195		*/
196	0	for (i = 0; i < 3; i++)
197	0	{
198	0	td->td_refblackwhite[2 * i + 0] = 0;
199	0	td->td_refblackwhite[2 * i + 1] =
200	0	(float)((1L << td->td_bitspersample) - 1L);
201	0	}
202	0	}
203	0	return 1;
204	0	}
205
206		/*
207		* Like TIFFGetField, but return any default
208		* value if the tag is not present in the directory.
209		*
210		* NB: We use the value in the directory, rather than
211		* explicit values so that defaults exist only one
212		* place in the library -- in TIFFDefaultDirectory.
213		*/
214		int TIFFVGetFieldDefaulted(TIFF *tif, uint32_t tag, va_list ap)
215	0	{
216	0	TIFFDirectory *td = &tif->tif_dir;
217
218	0	if (TIFFVGetField(tif, tag, ap))
219	0	return (1);
220	0	switch (tag)
221	0	{
222	0	case TIFFTAG_SUBFILETYPE:
223	0	va_arg(ap, uint32_t ) = td->td_subfiletype;
224	0	return (1);
225	0	case TIFFTAG_BITSPERSAMPLE:
226	0	va_arg(ap, uint16_t ) = td->td_bitspersample;
227	0	return (1);
228	0	case TIFFTAG_THRESHHOLDING:
229	0	va_arg(ap, uint16_t ) = td->td_threshholding;
230	0	return (1);
231	0	case TIFFTAG_FILLORDER:
232	0	va_arg(ap, uint16_t ) = td->td_fillorder;
233	0	return (1);
234	0	case TIFFTAG_ORIENTATION:
235	0	va_arg(ap, uint16_t ) = td->td_orientation;
236	0	return (1);
237	0	case TIFFTAG_SAMPLESPERPIXEL:
238	0	va_arg(ap, uint16_t ) = td->td_samplesperpixel;
239	0	return (1);
240	0	case TIFFTAG_ROWSPERSTRIP:
241	0	va_arg(ap, uint32_t ) = td->td_rowsperstrip;
242	0	return (1);
243	0	case TIFFTAG_MINSAMPLEVALUE:
244	0	va_arg(ap, uint16_t ) = td->td_minsamplevalue;
245	0	return (1);
246	0	case TIFFTAG_MAXSAMPLEVALUE:
247	0	{
248	0	uint16_t maxsamplevalue;
249		/* td_bitspersample=1 is always set in TIFFDefaultDirectory().
250		* Therefore, td_maxsamplevalue has to be re-calculated in
251		* TIFFGetFieldDefaulted(). */
252	0	if (td->td_bitspersample > 0)
253	0	{
254		/* This shift operation into a uint16_t limits the value to
255		* 65535 even if td_bitspersamle is > 16 */
256	0	if (td->td_bitspersample <= 16)
257	0	{
258	0	maxsamplevalue = (1 << td->td_bitspersample) -
259	0	1; /* 2*(BitsPerSample) - 1 /
260	0	}
261	0	else
262	0	{
263	0	maxsamplevalue = 65535;
264	0	}
265	0	}
266	0	else
267	0	{
268	0	maxsamplevalue = 0;
269	0	}
270	0	va_arg(ap, uint16_t ) = maxsamplevalue;
271	0	return (1);
272	0	}
273	0	case TIFFTAG_PLANARCONFIG:
274	0	va_arg(ap, uint16_t ) = td->td_planarconfig;
275	0	return (1);
276	0	case TIFFTAG_RESOLUTIONUNIT:
277	0	va_arg(ap, uint16_t ) = td->td_resolutionunit;
278	0	return (1);
279	0	case TIFFTAG_PREDICTOR:
280	0	{
281	0	TIFFPredictorState sp = (TIFFPredictorState )tif->tif_data;
282	0	if (sp == NULL)
283	0	{
284	0	TIFFErrorExtR(
285	0	tif, tif->tif_name,
286	0	"Cannot get \"Predictor\" tag as plugin is not configured");
287	0	va_arg(ap, uint16_t ) = 0;
288	0	return 0;
289	0	}
290	0	va_arg(ap, uint16_t ) = (uint16_t)sp->predictor;
291	0	return 1;
292	0	}
293	0	case TIFFTAG_DOTRANGE:
294	0	va_arg(ap, uint16_t ) = 0;
295	0	va_arg(ap, uint16_t ) = (1 << td->td_bitspersample) - 1;
296	0	return (1);
297	0	case TIFFTAG_INKSET:
298	0	va_arg(ap, uint16_t ) = INKSET_CMYK;
299	0	return 1;
300	0	case TIFFTAG_NUMBEROFINKS:
301	0	va_arg(ap, uint16_t ) = 4;
302	0	return (1);
303	0	case TIFFTAG_EXTRASAMPLES:
304	0	va_arg(ap, uint16_t ) = td->td_extrasamples;
305	0	va_arg(ap, const uint16_t *) = td->td_sampleinfo;
306	0	return (1);
307	0	case TIFFTAG_MATTEING:
308	0	va_arg(ap, uint16_t ) =
309	0	(td->td_extrasamples == 1 &&
310	0	td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
311	0	return (1);
312	0	case TIFFTAG_TILEDEPTH:
313	0	va_arg(ap, uint32_t ) = td->td_tiledepth;
314	0	return (1);
315	0	case TIFFTAG_DATATYPE:
316	0	va_arg(ap, uint16_t ) = td->td_sampleformat - 1;
317	0	return (1);
318	0	case TIFFTAG_SAMPLEFORMAT:
319	0	va_arg(ap, uint16_t ) = td->td_sampleformat;
320	0	return (1);
321	0	case TIFFTAG_IMAGEDEPTH:
322	0	va_arg(ap, uint32_t ) = td->td_imagedepth;
323	0	return (1);
324	0	case TIFFTAG_YCBCRCOEFFICIENTS:
325	0	{
326		/* defaults are from CCIR Recommendation 601-1 */
327	0	static const float ycbcrcoeffs[] = {0.299f, 0.587f, 0.114f};
328	0	va_arg(ap, const float *) = ycbcrcoeffs;
329	0	return 1;
330	0	}
331	0	case TIFFTAG_YCBCRSUBSAMPLING:
332	0	va_arg(ap, uint16_t ) = td->td_ycbcrsubsampling[0];
333	0	va_arg(ap, uint16_t ) = td->td_ycbcrsubsampling[1];
334	0	return (1);
335	0	case TIFFTAG_YCBCRPOSITIONING:
336	0	va_arg(ap, uint16_t ) = td->td_ycbcrpositioning;
337	0	return (1);
338	0	case TIFFTAG_WHITEPOINT:
339	0	{
340		/* TIFF 6.0 specification tells that it is no default
341		value for the WhitePoint, but AdobePhotoshop TIFF
342		Technical Note tells that it should be CIE D50. */
343	0	static const float whitepoint[] = {
344	0	D50_X0 / (D50_X0 + D50_Y0 + D50_Z0),
345	0	D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0)};
346	0	va_arg(ap, const float *) = whitepoint;
347	0	return 1;
348	0	}
349	0	case TIFFTAG_TRANSFERFUNCTION:
350	0	if (!td->td_transferfunction[0] &&
351	0	!TIFFDefaultTransferFunction(tif, td))
352	0	{
353	0	TIFFErrorExtR(tif, tif->tif_name,
354	0	"No space for \"TransferFunction\" tag");
355	0	return (0);
356	0	}
357	0	va_arg(ap, const uint16_t *) = td->td_transferfunction[0];
358	0	if (td->td_samplesperpixel - td->td_extrasamples > 1)
359	0	{
360	0	va_arg(ap, const uint16_t *) = td->td_transferfunction[1];
361	0	va_arg(ap, const uint16_t *) = td->td_transferfunction[2];
362	0	}
363	0	return (1);
364	0	case TIFFTAG_REFERENCEBLACKWHITE:
365	0	if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(tif, td))
366	0	return (0);
367	0	va_arg(ap, const float *) = td->td_refblackwhite;
368	0	return (1);
369	0	}
370	0	return 0;
371	0	}
372
373		/*
374		* Like TIFFGetField, but return any default
375		* value if the tag is not present in the directory.
376		*/
377		int TIFFGetFieldDefaulted(TIFF *tif, uint32_t tag, ...)
378	0	{
379	0	int ok;
380	0	va_list ap;
381
382	0	va_start(ap, tag);
383	0	ok = TIFFVGetFieldDefaulted(tif, tag, ap);
384	0	va_end(ap);
385	0	return (ok);
386	0	}
387
388		float _TIFFClampDoubleToFloat(double val)
389	0	{
390	0	if (val > FLT_MAX)
391	0	return FLT_MAX;
392	0	if (val < -FLT_MAX)
393	0	return -FLT_MAX;
394	0	return (float)val;
395	0	}
396
397		uint32_t _TIFFClampDoubleToUInt32(double val)
398	0	{
399	0	if (val < 0)
400	0	return 0;
401	0	if (val > 0xFFFFFFFFU \|\| val != val)
402	0	return 0xFFFFFFFFU;
403	0	return (uint32_t)val;
404	0	}
405
406		int _TIFFSeekOK(TIFF *tif, toff_t off)
407	0	{
408		/* Huge offsets, especially -1 / UINT64_MAX, can cause issues */
409		/* See http://bugzilla.maptools.org/show_bug.cgi?id=2726 */
410	0	return off <= (~(uint64_t)0) / 2 && TIFFSeekFile(tif, off, SEEK_SET) == off;
411	0	}