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1/* $Id: tif_aux.c,v 1.26 2010-07-01 15:33:28 dron Exp $ */
2
3/*
4 * Copyright (c) 1991-1997 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 * Auxiliary Support Routines.
31 */
32#include "tiffiop.h"
33#include "tif_predict.h"
34#include <math.h>
35
36uint32
37_TIFFMultiply32(TIFF* tif, uint32 first, uint32 second, const char* where)
38{
39 uint32 bytes = first * second;
40
41 if (second && bytes / second != first) {
42 TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
43 bytes = 0;
44 }
45
46 return bytes;
47}
48
49uint64
50_TIFFMultiply64(TIFF* tif, uint64 first, uint64 second, const char* where)
51{
52 uint64 bytes = first * second;
53
54 if (second && bytes / second != first) {
55 TIFFErrorExt(tif->tif_clientdata, where, "Integer overflow in %s", where);
56 bytes = 0;
57 }
58
59 return bytes;
60}
61
62void*
63_TIFFCheckRealloc(TIFF* tif, void* buffer,
64 tmsize_t nmemb, tmsize_t elem_size, const char* what)
65{
66 void* cp = NULL;
67 tmsize_t bytes = nmemb * elem_size;
68
69 /*
70 * XXX: Check for integer overflow.
71 */
72 if (nmemb && elem_size && bytes / elem_size == nmemb)
73 cp = _TIFFrealloc(buffer, bytes);
74
75 if (cp == NULL) {
76 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
77 "Failed to allocate memory for %s "
78 "(%ld elements of %ld bytes each)",
79 what,(long) nmemb, (long) elem_size);
80 }
81
82 return cp;
83}
84
85void*
86_TIFFCheckMalloc(TIFF* tif, tmsize_t nmemb, tmsize_t elem_size, const char* what)
87{
88 return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
89}
90
91static int
92TIFFDefaultTransferFunction(TIFFDirectory* td)
93{
94 uint16 **tf = td->td_transferfunction;
95 tmsize_t i, n, nbytes;
96
97 tf[0] = tf[1] = tf[2] = 0;
98 if (td->td_bitspersample >= sizeof(tmsize_t) * 8 - 2)
99 return 0;
100
101 n = ((tmsize_t)1)<<td->td_bitspersample;
102 nbytes = n * sizeof (uint16);
103 if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
104 return 0;
105 tf[0][0] = 0;
106 for (i = 1; i < n; i++) {
107 double t = (double)i/((double) n-1.);
108 tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
109 }
110
111 if (td->td_samplesperpixel - td->td_extrasamples > 1) {
112 if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
113 goto bad;
114 _TIFFmemcpy(tf[1], tf[0], nbytes);
115 if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
116 goto bad;
117 _TIFFmemcpy(tf[2], tf[0], nbytes);
118 }
119 return 1;
120
121bad:
122 if (tf[0])
123 _TIFFfree(tf[0]);
124 if (tf[1])
125 _TIFFfree(tf[1]);
126 if (tf[2])
127 _TIFFfree(tf[2]);
128 tf[0] = tf[1] = tf[2] = 0;
129 return 0;
130}
131
132static int
133TIFFDefaultRefBlackWhite(TIFFDirectory* td)
134{
135 int i;
136
137 if (!(td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float))))
138 return 0;
139 if (td->td_photometric == PHOTOMETRIC_YCBCR) {
140 /*
141 * YCbCr (Class Y) images must have the ReferenceBlackWhite
142 * tag set. Fix the broken images, which lacks that tag.
143 */
144 td->td_refblackwhite[0] = 0.0F;
145 td->td_refblackwhite[1] = td->td_refblackwhite[3] =
146 td->td_refblackwhite[5] = 255.0F;
147 td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
148 } else {
149 /*
150 * Assume RGB (Class R)
151 */
152 for (i = 0; i < 3; i++) {
153 td->td_refblackwhite[2*i+0] = 0;
154 td->td_refblackwhite[2*i+1] =
155 (float)((1L<<td->td_bitspersample)-1L);
156 }
157 }
158 return 1;
159}
160
161/*
162 * Like TIFFGetField, but return any default
163 * value if the tag is not present in the directory.
164 *
165 * NB: We use the value in the directory, rather than
166 * explcit values so that defaults exist only one
167 * place in the library -- in TIFFDefaultDirectory.
168 */
169int
170TIFFVGetFieldDefaulted(TIFF* tif, uint32 tag, va_list ap)
171{
172 TIFFDirectory *td = &tif->tif_dir;
173
174 if (TIFFVGetField(tif, tag, ap))
175 return (1);
176 switch (tag) {
177 case TIFFTAG_SUBFILETYPE:
178 *va_arg(ap, uint32 *) = td->td_subfiletype;
179 return (1);
180 case TIFFTAG_BITSPERSAMPLE:
181 *va_arg(ap, uint16 *) = td->td_bitspersample;
182 return (1);
183 case TIFFTAG_THRESHHOLDING:
184 *va_arg(ap, uint16 *) = td->td_threshholding;
185 return (1);
186 case TIFFTAG_FILLORDER:
187 *va_arg(ap, uint16 *) = td->td_fillorder;
188 return (1);
189 case TIFFTAG_ORIENTATION:
190 *va_arg(ap, uint16 *) = td->td_orientation;
191 return (1);
192 case TIFFTAG_SAMPLESPERPIXEL:
193 *va_arg(ap, uint16 *) = td->td_samplesperpixel;
194 return (1);
195 case TIFFTAG_ROWSPERSTRIP:
196 *va_arg(ap, uint32 *) = td->td_rowsperstrip;
197 return (1);
198 case TIFFTAG_MINSAMPLEVALUE:
199 *va_arg(ap, uint16 *) = td->td_minsamplevalue;
200 return (1);
201 case TIFFTAG_MAXSAMPLEVALUE:
202 *va_arg(ap, uint16 *) = td->td_maxsamplevalue;
203 return (1);
204 case TIFFTAG_PLANARCONFIG:
205 *va_arg(ap, uint16 *) = td->td_planarconfig;
206 return (1);
207 case TIFFTAG_RESOLUTIONUNIT:
208 *va_arg(ap, uint16 *) = td->td_resolutionunit;
209 return (1);
210 case TIFFTAG_PREDICTOR:
211 {
212 TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
213 *va_arg(ap, uint16*) = (uint16) sp->predictor;
214 return 1;
215 }
216 case TIFFTAG_DOTRANGE:
217 *va_arg(ap, uint16 *) = 0;
218 *va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
219 return (1);
220 case TIFFTAG_INKSET:
221 *va_arg(ap, uint16 *) = INKSET_CMYK;
222 return 1;
223 case TIFFTAG_NUMBEROFINKS:
224 *va_arg(ap, uint16 *) = 4;
225 return (1);
226 case TIFFTAG_EXTRASAMPLES:
227 *va_arg(ap, uint16 *) = td->td_extrasamples;
228 *va_arg(ap, uint16 **) = td->td_sampleinfo;
229 return (1);
230 case TIFFTAG_MATTEING:
231 *va_arg(ap, uint16 *) =
232 (td->td_extrasamples == 1 &&
233 td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
234 return (1);
235 case TIFFTAG_TILEDEPTH:
236 *va_arg(ap, uint32 *) = td->td_tiledepth;
237 return (1);
238 case TIFFTAG_DATATYPE:
239 *va_arg(ap, uint16 *) = td->td_sampleformat-1;
240 return (1);
241 case TIFFTAG_SAMPLEFORMAT:
242 *va_arg(ap, uint16 *) = td->td_sampleformat;
243 return(1);
244 case TIFFTAG_IMAGEDEPTH:
245 *va_arg(ap, uint32 *) = td->td_imagedepth;
246 return (1);
247 case TIFFTAG_YCBCRCOEFFICIENTS:
248 {
249 /* defaults are from CCIR Recommendation 601-1 */
250 static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
251 *va_arg(ap, float **) = ycbcrcoeffs;
252 return 1;
253 }
254 case TIFFTAG_YCBCRSUBSAMPLING:
255 *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
256 *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
257 return (1);
258 case TIFFTAG_YCBCRPOSITIONING:
259 *va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
260 return (1);
261 case TIFFTAG_WHITEPOINT:
262 {
263 static float whitepoint[2];
264
265 /* TIFF 6.0 specification tells that it is no default
266 value for the WhitePoint, but AdobePhotoshop TIFF
267 Technical Note tells that it should be CIE D50. */
268 whitepoint[0] = D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
269 whitepoint[1] = D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
270 *va_arg(ap, float **) = whitepoint;
271 return 1;
272 }
273 case TIFFTAG_TRANSFERFUNCTION:
274 if (!td->td_transferfunction[0] &&
275 !TIFFDefaultTransferFunction(td)) {
276 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
277 return (0);
278 }
279 *va_arg(ap, uint16 **) = td->td_transferfunction[0];
280 if (td->td_samplesperpixel - td->td_extrasamples > 1) {
281 *va_arg(ap, uint16 **) = td->td_transferfunction[1];
282 *va_arg(ap, uint16 **) = td->td_transferfunction[2];
283 }
284 return (1);
285 case TIFFTAG_REFERENCEBLACKWHITE:
286 if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(td))
287 return (0);
288 *va_arg(ap, float **) = td->td_refblackwhite;
289 return (1);
290 }
291 return 0;
292}
293
294/*
295 * Like TIFFGetField, but return any default
296 * value if the tag is not present in the directory.
297 */
298int
299TIFFGetFieldDefaulted(TIFF* tif, uint32 tag, ...)
300{
301 int ok;
302 va_list ap;
303
304 va_start(ap, tag);
305 ok = TIFFVGetFieldDefaulted(tif, tag, ap);
306 va_end(ap);
307 return (ok);
308}
309
310struct _Int64Parts {
311 int32 low, high;
312};
313
314typedef union {
315 struct _Int64Parts part;
316 int64 value;
317} _Int64;
318
319float
320_TIFFUInt64ToFloat(uint64 ui64)
321{
322 _Int64 i;
323
324 i.value = ui64;
325 if (i.part.high >= 0) {
326 return (float)i.value;
327 } else {
328 long double df;
329 df = (long double)i.value;
330 df += 18446744073709551616.0; /* adding 2**64 */
331 return (float)df;
332 }
333}
334
335double
336_TIFFUInt64ToDouble(uint64 ui64)
337{
338 _Int64 i;
339
340 i.value = ui64;
341 if (i.part.high >= 0) {
342 return (double)i.value;
343 } else {
344 long double df;
345 df = (long double)i.value;
346 df += 18446744073709551616.0; /* adding 2**64 */
347 return (double)df;
348 }
349}
350
351/* vim: set ts=8 sts=8 sw=8 noet: */
352/*
353 * Local Variables:
354 * mode: c
355 * c-basic-offset: 8
356 * fill-column: 78
357 * End:
358 */
359
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