aboutsummaryrefslogtreecommitdiff
path: root/pixman/test/utils.c
blob: 56701c4bb5eb349bd5b53f2c86df8636b4a1ce74 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
#define _GNU_SOURCE

#include "utils.h"
#include <signal.h>

#ifdef HAVE_GETTIMEOFDAY
#include <sys/time.h>
#else
#include <time.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif

#ifdef HAVE_FENV_H
#include <fenv.h>
#endif

/* Random number seed
 */

uint32_t lcg_seed;

/*----------------------------------------------------------------------------*\
 *  CRC-32 version 2.0.0 by Craig Bruce, 2006-04-29.
 *
 *  This program generates the CRC-32 values for the files named in the
 *  command-line arguments.  These are the same CRC-32 values used by GZIP,
 *  PKZIP, and ZMODEM.  The Crc32_ComputeBuf () can also be detached and
 *  used independently.
 *
 *  THIS PROGRAM IS PUBLIC-DOMAIN SOFTWARE.
 *
 *  Based on the byte-oriented implementation "File Verification Using CRC"
 *  by Mark R. Nelson in Dr. Dobb's Journal, May 1992, pp. 64-67.
 *
 *  v1.0.0: original release.
 *  v1.0.1: fixed printf formats.
 *  v1.0.2: fixed something else.
 *  v1.0.3: replaced CRC constant table by generator function.
 *  v1.0.4: reformatted code, made ANSI C.  1994-12-05.
 *  v2.0.0: rewrote to use memory buffer & static table, 2006-04-29.
\*----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*\
 *  NAME:
 *     Crc32_ComputeBuf () - computes the CRC-32 value of a memory buffer
 *  DESCRIPTION:
 *     Computes or accumulates the CRC-32 value for a memory buffer.
 *     The 'inCrc32' gives a previously accumulated CRC-32 value to allow
 *     a CRC to be generated for multiple sequential buffer-fuls of data.
 *     The 'inCrc32' for the first buffer must be zero.
 *  ARGUMENTS:
 *     inCrc32 - accumulated CRC-32 value, must be 0 on first call
 *     buf     - buffer to compute CRC-32 value for
 *     bufLen  - number of bytes in buffer
 *  RETURNS:
 *     crc32 - computed CRC-32 value
 *  ERRORS:
 *     (no errors are possible)
\*----------------------------------------------------------------------------*/

uint32_t
compute_crc32 (uint32_t    in_crc32,
	       const void *buf,
	       size_t      buf_len)
{
    static const uint32_t crc_table[256] = {
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
	0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
	0x09B64C2B, 0x7EB17CBD,	0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
	0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,	0x14015C4F, 0x63066CD9,
	0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
	0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
	0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
	0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
	0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106,
	0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
	0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
	0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
	0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
	0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
	0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA,
	0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
	0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
	0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84,
	0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
	0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
	0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
	0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
	0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
	0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28,
	0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
	0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
	0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
	0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
	0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
	0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
	0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
	0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
	0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
    };

    uint32_t              crc32;
    unsigned char *       byte_buf;
    size_t                i;

    /* accumulate crc32 for buffer */
    crc32 = in_crc32 ^ 0xFFFFFFFF;
    byte_buf = (unsigned char*) buf;

    for (i = 0; i < buf_len; i++)
	crc32 = (crc32 >> 8) ^ crc_table[(crc32 ^ byte_buf[i]) & 0xFF];

    return (crc32 ^ 0xFFFFFFFF);
}

/* perform endian conversion of pixel data
 */
void
image_endian_swap (pixman_image_t *img)
{
    int stride = pixman_image_get_stride (img);
    uint32_t *data = pixman_image_get_data (img);
    int height = pixman_image_get_height (img);
    int bpp = PIXMAN_FORMAT_BPP (pixman_image_get_format (img));
    int i, j;

    /* swap bytes only on big endian systems */
    volatile uint16_t endian_check_var = 0x1234;
    if (*(volatile uint8_t *)&endian_check_var != 0x12)
	return;

    if (bpp == 8)
	return;

    for (i = 0; i < height; i++)
    {
	uint8_t *line_data = (uint8_t *)data + stride * i;
	
	switch (bpp)
	{
	case 1:
	    for (j = 0; j < stride; j++)
	    {
		line_data[j] =
		    ((line_data[j] & 0x80) >> 7) |
		    ((line_data[j] & 0x40) >> 5) |
		    ((line_data[j] & 0x20) >> 3) |
		    ((line_data[j] & 0x10) >> 1) |
		    ((line_data[j] & 0x08) << 1) |
		    ((line_data[j] & 0x04) << 3) |
		    ((line_data[j] & 0x02) << 5) |
		    ((line_data[j] & 0x01) << 7);
	    }
	    break;
	case 4:
	    for (j = 0; j < stride; j++)
	    {
		line_data[j] = (line_data[j] >> 4) | (line_data[j] << 4);
	    }
	    break;
	case 16:
	    for (j = 0; j + 2 <= stride; j += 2)
	    {
		char t1 = line_data[j + 0];
		char t2 = line_data[j + 1];

		line_data[j + 1] = t1;
		line_data[j + 0] = t2;
	    }
	    break;
	case 24:
	    for (j = 0; j + 3 <= stride; j += 3)
	    {
		char t1 = line_data[j + 0];
		char t2 = line_data[j + 1];
		char t3 = line_data[j + 2];

		line_data[j + 2] = t1;
		line_data[j + 1] = t2;
		line_data[j + 0] = t3;
	    }
	    break;
	case 32:
	    for (j = 0; j + 4 <= stride; j += 4)
	    {
		char t1 = line_data[j + 0];
		char t2 = line_data[j + 1];
		char t3 = line_data[j + 2];
		char t4 = line_data[j + 3];

		line_data[j + 3] = t1;
		line_data[j + 2] = t2;
		line_data[j + 1] = t3;
		line_data[j + 0] = t4;
	    }
	    break;
	default:
	    assert (FALSE);
	    break;
	}
    }
}

#define N_LEADING_PROTECTED	10
#define N_TRAILING_PROTECTED	10

typedef struct
{
    void *addr;
    uint32_t len;
    uint8_t *trailing;
    int n_bytes;
} info_t;

#if defined(HAVE_MPROTECT) && defined(HAVE_GETPAGESIZE) && defined(HAVE_SYS_MMAN_H)

/* This is apparently necessary on at least OS X */
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif

void *
fence_malloc (int64_t len)
{
    unsigned long page_size = getpagesize();
    unsigned long page_mask = page_size - 1;
    uint32_t n_payload_bytes = (len + page_mask) & ~page_mask;
    uint32_t n_bytes =
	(page_size * (N_LEADING_PROTECTED + N_TRAILING_PROTECTED + 2) +
	 n_payload_bytes) & ~page_mask;
    uint8_t *initial_page;
    uint8_t *leading_protected;
    uint8_t *trailing_protected;
    uint8_t *payload;
    uint8_t *addr;

    if (len < 0)
	abort();
    
    addr = mmap (NULL, n_bytes, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS,
		 -1, 0);

    if (addr == MAP_FAILED)
    {
	printf ("mmap failed on %lld %u\n", (long long int)len, n_bytes);
	return NULL;
    }

    initial_page = (uint8_t *)(((unsigned long)addr + page_mask) & ~page_mask);
    leading_protected = initial_page + page_size;
    payload = leading_protected + N_LEADING_PROTECTED * page_size;
    trailing_protected = payload + n_payload_bytes;

    ((info_t *)initial_page)->addr = addr;
    ((info_t *)initial_page)->len = len;
    ((info_t *)initial_page)->trailing = trailing_protected;
    ((info_t *)initial_page)->n_bytes = n_bytes;

    if ((mprotect (leading_protected, N_LEADING_PROTECTED * page_size,
		  PROT_NONE) == -1) ||
	(mprotect (trailing_protected, N_TRAILING_PROTECTED * page_size,
		  PROT_NONE) == -1))
    {
	munmap (addr, n_bytes);
	return NULL;
    }

    return payload;
}

void
fence_free (void *data)
{
    uint32_t page_size = getpagesize();
    uint8_t *payload = data;
    uint8_t *leading_protected = payload - N_LEADING_PROTECTED * page_size;
    uint8_t *initial_page = leading_protected - page_size;
    info_t *info = (info_t *)initial_page;

    munmap (info->addr, info->n_bytes);
}

#else

void *
fence_malloc (int64_t len)
{
    return malloc (len);
}

void
fence_free (void *data)
{
    free (data);
}

#endif

uint8_t *
make_random_bytes (int n_bytes)
{
    uint8_t *bytes = fence_malloc (n_bytes);
    int i;

    if (!bytes)
	return NULL;

    for (i = 0; i < n_bytes; ++i)
	bytes[i] = lcg_rand () & 0xff;

    return bytes;
}

/*
 * A function, which can be used as a core part of the test programs,
 * intended to detect various problems with the help of fuzzing input
 * to pixman API (according to some templates, aka "smart" fuzzing).
 * Some general information about such testing can be found here:
 * http://en.wikipedia.org/wiki/Fuzz_testing
 *
 * It may help detecting:
 *  - crashes on bad handling of valid or reasonably invalid input to
 *    pixman API.
 *  - deviations from the behavior of older pixman releases.
 *  - deviations from the behavior of the same pixman release, but
 *    configured in a different way (for example with SIMD optimizations
 *    disabled), or running on a different OS or hardware.
 *
 * The test is performed by calling a callback function a huge number
 * of times. The callback function is expected to run some snippet of
 * pixman code with pseudorandom variations to the data feeded to
 * pixman API. A result of running each callback function should be
 * some deterministic value which depends on test number (test number
 * can be used as a seed for PRNG). When 'verbose' argument is nonzero,
 * callback function is expected to print to stdout some information
 * about what it does.
 *
 * Return values from many small tests are accumulated together and
 * used as final checksum, which can be compared to some expected
 * value. Running the tests not individually, but in a batch helps
 * to reduce process start overhead and also allows to parallelize
 * testing and utilize multiple CPU cores.
 *
 * The resulting executable can be run without any arguments. In
 * this case it runs a batch of tests starting from 1 and up to
 * 'default_number_of_iterations'. The resulting checksum is
 * compared with 'expected_checksum' and FAIL or PASS verdict
 * depends on the result of this comparison.
 *
 * If the executable is run with 2 numbers provided as command line
 * arguments, they specify the starting and ending numbers for a test
 * batch.
 *
 * If the executable is run with only one number provided as a command
 * line argument, then this number is used to call the callback function
 * once, and also with verbose flag set.
 */
int
fuzzer_test_main (const char *test_name,
		  int         default_number_of_iterations,
		  uint32_t    expected_checksum,
		  uint32_t    (*test_function)(int testnum, int verbose),
		  int         argc,
		  const char *argv[])
{
    int i, n1 = 1, n2 = 0;
    uint32_t checksum = 0;
    int verbose = getenv ("VERBOSE") != NULL;

    if (argc >= 3)
    {
	n1 = atoi (argv[1]);
	n2 = atoi (argv[2]);
	if (n2 < n1)
	{
	    printf ("invalid test range\n");
	    return 1;
	}
    }
    else if (argc >= 2)
    {
	n2 = atoi (argv[1]);
	checksum = test_function (n2, 1);
	printf ("%d: checksum=%08X\n", n2, checksum);
	return 0;
    }
    else
    {
	n1 = 1;
	n2 = default_number_of_iterations;
    }

#ifdef USE_OPENMP
    #pragma omp parallel for reduction(+:checksum) default(none) \
					shared(n1, n2, test_function, verbose)
#endif
    for (i = n1; i <= n2; i++)
    {
	uint32_t crc = test_function (i, 0);
	if (verbose)
	    printf ("%d: %08X\n", i, crc);
	checksum += crc;
    }

    if (n1 == 1 && n2 == default_number_of_iterations)
    {
	if (checksum == expected_checksum)
	{
	    printf ("%s test passed (checksum=%08X)\n",
		    test_name, checksum);
	}
	else
	{
	    printf ("%s test failed! (checksum=%08X, expected %08X)\n",
		    test_name, checksum, expected_checksum);
	    return 1;
	}
    }
    else
    {
	printf ("%d-%d: checksum=%08X\n", n1, n2, checksum);
    }

    return 0;
}

/* Try to obtain current time in seconds */
double
gettime (void)
{
#ifdef HAVE_GETTIMEOFDAY
    struct timeval tv;

    gettimeofday (&tv, NULL);
    return (double)((int64_t)tv.tv_sec * 1000000 + tv.tv_usec) / 1000000.;
#else
    return (double)clock() / (double)CLOCKS_PER_SEC;
#endif
}

uint32_t
get_random_seed (void)
{
    double d = gettime();

    lcg_srand (*(uint32_t *)&d);

    return lcg_rand_u32 ();
}

static const char *global_msg;

static void
on_alarm (int signo)
{
    printf ("%s\n", global_msg);
    exit (1);
}

void
fail_after (int seconds, const char *msg)
{
#ifdef HAVE_SIGACTION
#ifdef HAVE_ALARM
    struct sigaction action;

    global_msg = msg;

    memset (&action, 0, sizeof (action));
    action.sa_handler = on_alarm;

    alarm (seconds);

    sigaction (SIGALRM, &action, NULL);
#endif
#endif
}

void
enable_fp_exceptions (void)
{
#ifdef HAVE_FENV_H
#ifdef HAVE_FEENABLEEXCEPT
    /* Note: we don't enable the FE_INEXACT trap because
     * that happens quite commonly. It is possible that
     * over- and underflow should similarly be considered
     * okay, but for now the test suite passes with them
     * enabled, and it's useful to know if they start
     * occuring.
     */
    feenableexcept (FE_DIVBYZERO	|
		    FE_INVALID		|
		    FE_OVERFLOW		|
		    FE_UNDERFLOW);
#endif
#endif
}

void *
aligned_malloc (size_t align, size_t size)
{
    void *result;

#ifdef HAVE_POSIX_MEMALIGN
    if (posix_memalign (&result, align, size) != 0)
      result = NULL;
#else
    result = malloc (size);
#endif

    return result;
}

#define CONVERT_15(c, is_rgb)						\
    (is_rgb?								\
     ((((c) >> 3) & 0x001f) |						\
      (((c) >> 6) & 0x03e0) |						\
      (((c) >> 9) & 0x7c00)) :						\
     (((((c) >> 16) & 0xff) * 153 +					\
       (((c) >>  8) & 0xff) * 301 +					\
       (((c)      ) & 0xff) * 58) >> 2))

void
initialize_palette (pixman_indexed_t *palette, uint32_t depth, int is_rgb)
{
    int i;
    uint32_t mask = (1 << depth) - 1;

    for (i = 0; i < 32768; ++i)
	palette->ent[i] = lcg_rand() & mask;

    memset (palette->rgba, 0, sizeof (palette->rgba));

    for (i = 0; i < mask + 1; ++i)
    {
	uint32_t rgba24;
 	pixman_bool_t retry;
	uint32_t i15;

	/* We filled the rgb->index map with random numbers, but we
	 * do need the ability to round trip, that is if some indexed
	 * color expands to an argb24, then the 15 bit version of that
	 * color must map back to the index. Anything else, we don't
	 * care about too much.
	 */
	do
	{
	    uint32_t old_idx;

	    rgba24 = lcg_rand();
	    i15 = CONVERT_15 (rgba24, is_rgb);

	    old_idx = palette->ent[i15];
	    if (CONVERT_15 (palette->rgba[old_idx], is_rgb) == i15)
		retry = 1;
	    else
		retry = 0;
	} while (retry);

	palette->rgba[i] = rgba24;
	palette->ent[i15] = i;
    }

    for (i = 0; i < mask + 1; ++i)
    {
	assert (palette->ent[CONVERT_15 (palette->rgba[i], is_rgb)] == i);
    }
}