summaryrefslogtreecommitdiff
path: root/dviware/dvisvgm/libs/brotli/common/platform.h
blob: f5ca4435bc003bc817823ec3936509fa087493aa (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
586
587
588
589
590
591
592
593
594
/* Copyright 2016 Google Inc. All Rights Reserved.

   Distributed under MIT license.
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/

/* Macros for compiler / platform specific features and build options.

   Build options are:
    * BROTLI_BUILD_32_BIT disables 64-bit optimizations
    * BROTLI_BUILD_64_BIT forces to use 64-bit optimizations
    * BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations
    * BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations
    * BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations
    * BROTLI_BUILD_PORTABLE disables dangerous optimizations, like unaligned
      read and overlapping memcpy; this reduces decompression speed by 5%
    * BROTLI_BUILD_NO_RBIT disables "rbit" optimization for ARM CPUs
    * BROTLI_DEBUG dumps file name and line number when decoder detects stream
      or memory error
    * BROTLI_ENABLE_LOG enables asserts and dumps various state information
*/

#ifndef BROTLI_COMMON_PLATFORM_H_
#define BROTLI_COMMON_PLATFORM_H_

#include <string.h>  /* memcpy */

#include <brotli/port.h>
#include <brotli/types.h>

#if defined(OS_LINUX) || defined(OS_CYGWIN) || defined(__EMSCRIPTEN__)
#include <endian.h>
#elif defined(OS_FREEBSD)
#include <machine/endian.h>
#elif defined(OS_MACOSX)
#include <machine/endian.h>
/* Let's try and follow the Linux convention */
#define BROTLI_X_BYTE_ORDER BYTE_ORDER
#define BROTLI_X_LITTLE_ENDIAN LITTLE_ENDIAN
#define BROTLI_X_BIG_ENDIAN BIG_ENDIAN
#endif

#if BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
#include <intrin.h>
#endif

#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG)
#include <assert.h>
#include <stdio.h>
#endif

/* The following macros were borrowed from https://github.com/nemequ/hedley
 * with permission of original author - Evan Nemerson <evan@nemerson.com> */

/* >>> >>> >>> hedley macros */

/* Define "BROTLI_PREDICT_TRUE" and "BROTLI_PREDICT_FALSE" macros for capable
   compilers.

To apply compiler hint, enclose the branching condition into macros, like this:

  if (BROTLI_PREDICT_TRUE(zero == 0)) {
    // main execution path
  } else {
    // compiler should place this code outside of main execution path
  }

OR:

  if (BROTLI_PREDICT_FALSE(something_rare_or_unexpected_happens)) {
    // compiler should place this code outside of main execution path
  }

*/
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_expect, 3, 0, 0) || \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0) ||               \
    BROTLI_SUNPRO_VERSION_CHECK(5, 15, 0) ||              \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) ||                  \
    BROTLI_IBM_VERSION_CHECK(10, 1, 0) ||                 \
    BROTLI_TI_VERSION_CHECK(7, 3, 0) ||                   \
    BROTLI_TINYC_VERSION_CHECK(0, 9, 27)
#define BROTLI_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
#define BROTLI_PREDICT_FALSE(x) (__builtin_expect(x, 0))
#else
#define BROTLI_PREDICT_FALSE(x) (x)
#define BROTLI_PREDICT_TRUE(x) (x)
#endif

#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \
    !defined(__cplusplus)
#define BROTLI_RESTRICT restrict
#elif BROTLI_GNUC_VERSION_CHECK(3, 1, 0) ||                         \
    BROTLI_MSVC_VERSION_CHECK(14, 0, 0) ||                          \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0) ||                         \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) ||                            \
    BROTLI_IBM_VERSION_CHECK(10, 1, 0) ||                           \
    BROTLI_PGI_VERSION_CHECK(17, 10, 0) ||                          \
    BROTLI_TI_VERSION_CHECK(8, 0, 0) ||                             \
    BROTLI_IAR_VERSION_CHECK(8, 0, 0) ||                            \
    (BROTLI_SUNPRO_VERSION_CHECK(5, 14, 0) && defined(__cplusplus))
#define BROTLI_RESTRICT __restrict
#elif BROTLI_SUNPRO_VERSION_CHECK(5, 3, 0) && !defined(__cplusplus)
#define BROTLI_RESTRICT _Restrict
#else
#define BROTLI_RESTRICT
#endif

#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || \
    (defined(__cplusplus) && (__cplusplus >= 199711L))
#define BROTLI_MAYBE_INLINE inline
#elif defined(__GNUC_STDC_INLINE__) || defined(__GNUC_GNU_INLINE__) || \
    BROTLI_ARM_VERSION_CHECK(6, 2, 0)
#define BROTLI_MAYBE_INLINE __inline__
#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0) || \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) || BROTLI_TI_VERSION_CHECK(8, 0, 0)
#define BROTLI_MAYBE_INLINE __inline
#else
#define BROTLI_MAYBE_INLINE
#endif

#if BROTLI_GNUC_HAS_ATTRIBUTE(always_inline, 4, 0, 0) ||                       \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0) ||                                    \
    BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) ||                                   \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) ||                                       \
    BROTLI_IBM_VERSION_CHECK(10, 1, 0) ||                                      \
    BROTLI_TI_VERSION_CHECK(8, 0, 0) ||                                        \
    (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
#define BROTLI_INLINE BROTLI_MAYBE_INLINE __attribute__((__always_inline__))
#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
#define BROTLI_INLINE BROTLI_MAYBE_INLINE __forceinline
#elif BROTLI_TI_VERSION_CHECK(7, 0, 0) && defined(__cplusplus)
#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("FUNC_ALWAYS_INLINE;")
#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0)
#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("inline=forced")
#else
#define BROTLI_INLINE BROTLI_MAYBE_INLINE
#endif

#if BROTLI_GNUC_HAS_ATTRIBUTE(noinline, 4, 0, 0) ||                            \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0) ||                                    \
    BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) ||                                   \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) ||                                       \
    BROTLI_IBM_VERSION_CHECK(10, 1, 0) ||                                      \
    BROTLI_TI_VERSION_CHECK(8, 0, 0) ||                                        \
    (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
#define BROTLI_NOINLINE __attribute__((__noinline__))
#elif BROTLI_MSVC_VERSION_CHECK(13, 10, 0)
#define BROTLI_NOINLINE __declspec(noinline)
#elif BROTLI_PGI_VERSION_CHECK(10, 2, 0)
#define BROTLI_NOINLINE _Pragma("noinline")
#elif BROTLI_TI_VERSION_CHECK(6, 0, 0) && defined(__cplusplus)
#define BROTLI_NOINLINE _Pragma("FUNC_CANNOT_INLINE;")
#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0)
#define BROTLI_NOINLINE _Pragma("inline=never")
#else
#define BROTLI_NOINLINE
#endif

/* BROTLI_INTERNAL could be defined to override visibility, e.g. for tests. */
#if !defined(BROTLI_INTERNAL)
#if defined(_WIN32) || defined(__CYGWIN__)
#define BROTLI_INTERNAL
#elif BROTLI_GNUC_VERSION_CHECK(3, 3, 0) ||                         \
    BROTLI_TI_VERSION_CHECK(8, 0, 0) ||                             \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0) ||                         \
    BROTLI_ARM_VERSION_CHECK(4, 1, 0) ||                            \
    BROTLI_IBM_VERSION_CHECK(13, 1, 0) ||                           \
    BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) ||                        \
    (BROTLI_TI_VERSION_CHECK(7, 3, 0) &&                            \
     defined(__TI_GNU_ATTRIBUTE_SUPPORT__) && defined(__TI_EABI__))
#define BROTLI_INTERNAL __attribute__ ((visibility ("hidden")))
#else
#define BROTLI_INTERNAL
#endif
#endif

/* <<< <<< <<< end of hedley macros. */

#if BROTLI_GNUC_HAS_ATTRIBUTE(unused, 2, 7, 0) || \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE __attribute__ ((unused))
#else
#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE
#endif

#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)
#define BROTLI_ALIGNED(N) __attribute__((aligned(N)))
#else
#define BROTLI_ALIGNED(N)
#endif

#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \
    (defined(M_ARM) && (M_ARM == 7))
#define BROTLI_TARGET_ARMV7
#endif  /* ARMv7 */

#if (defined(__ARM_ARCH) && (__ARM_ARCH == 8)) || \
    defined(__aarch64__) || defined(__ARM64_ARCH_8__)
#define BROTLI_TARGET_ARMV8_ANY

#if defined(__ARM_32BIT_STATE)
#define BROTLI_TARGET_ARMV8_32
#elif defined(__ARM_64BIT_STATE)
#define BROTLI_TARGET_ARMV8_64
#endif

#endif  /* ARMv8 */

#if defined(__ARM_NEON__) || defined(__ARM_NEON)
#define BROTLI_TARGET_NEON
#endif

#if defined(__i386) || defined(_M_IX86)
#define BROTLI_TARGET_X86
#endif

#if defined(__x86_64__) || defined(_M_X64)
#define BROTLI_TARGET_X64
#endif

#if defined(__PPC64__)
#define BROTLI_TARGET_POWERPC64
#endif

#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64
#define BROTLI_TARGET_RISCV64
#endif

#if defined(BROTLI_BUILD_64_BIT)
#define BROTLI_64_BITS 1
#elif defined(BROTLI_BUILD_32_BIT)
#define BROTLI_64_BITS 0
#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8_64) || \
    defined(BROTLI_TARGET_POWERPC64) || defined(BROTLI_TARGET_RISCV64)
#define BROTLI_64_BITS 1
#else
#define BROTLI_64_BITS 0
#endif

#if (BROTLI_64_BITS)
#define brotli_reg_t uint64_t
#else
#define brotli_reg_t uint32_t
#endif

#if defined(BROTLI_BUILD_BIG_ENDIAN)
#define BROTLI_BIG_ENDIAN 1
#elif defined(BROTLI_BUILD_LITTLE_ENDIAN)
#define BROTLI_LITTLE_ENDIAN 1
#elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL)
/* Just break elif chain. */
#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define BROTLI_LITTLE_ENDIAN 1
#elif defined(_WIN32) || defined(BROTLI_TARGET_X64)
/* Win32 & x64 can currently always be assumed to be little endian */
#define BROTLI_LITTLE_ENDIAN 1
#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define BROTLI_BIG_ENDIAN 1
#elif defined(BROTLI_X_BYTE_ORDER)
#if BROTLI_X_BYTE_ORDER == BROTLI_X_LITTLE_ENDIAN
#define BROTLI_LITTLE_ENDIAN 1
#elif BROTLI_X_BYTE_ORDER == BROTLI_X_BIG_ENDIAN
#define BROTLI_BIG_ENDIAN 1
#endif
#endif  /* BROTLI_X_BYTE_ORDER */

#if !defined(BROTLI_LITTLE_ENDIAN)
#define BROTLI_LITTLE_ENDIAN 0
#endif

#if !defined(BROTLI_BIG_ENDIAN)
#define BROTLI_BIG_ENDIAN 0
#endif

#if defined(BROTLI_X_BYTE_ORDER)
#undef BROTLI_X_BYTE_ORDER
#undef BROTLI_X_LITTLE_ENDIAN
#undef BROTLI_X_BIG_ENDIAN
#endif

#if defined(BROTLI_BUILD_PORTABLE)
#define BROTLI_ALIGNED_READ (!!1)
#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \
    defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) || \
    defined(BROTLI_TARGET_RISCV64)
/* Allow unaligned read only for white-listed CPUs. */
#define BROTLI_ALIGNED_READ (!!0)
#else
#define BROTLI_ALIGNED_READ (!!1)
#endif

#if BROTLI_ALIGNED_READ
/* Portable unaligned memory access: read / write values via memcpy. */
static BROTLI_INLINE uint16_t BrotliUnalignedRead16(const void* p) {
  uint16_t t;
  memcpy(&t, p, sizeof t);
  return t;
}
static BROTLI_INLINE uint32_t BrotliUnalignedRead32(const void* p) {
  uint32_t t;
  memcpy(&t, p, sizeof t);
  return t;
}
static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
  uint64_t t;
  memcpy(&t, p, sizeof t);
  return t;
}
static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
  memcpy(p, &v, sizeof v);
}
#else  /* BROTLI_ALIGNED_READ */
/* Unaligned memory access is allowed: just cast pointer to requested type. */
#if BROTLI_SANITIZED
/* Consider we have an unaligned load/store of 4 bytes from address 0x...05.
   AddressSanitizer will treat it as a 3-byte access to the range 05:07 and
   will miss a bug if 08 is the first unaddressable byte.
   ThreadSanitizer will also treat this as a 3-byte access to 05:07 and will
   miss a race between this access and some other accesses to 08.
   MemorySanitizer will correctly propagate the shadow on unaligned stores
   and correctly report bugs on unaligned loads, but it may not properly
   update and report the origin of the uninitialized memory.
   For all three tools, replacing an unaligned access with a tool-specific
   callback solves the problem. */
#if defined(__cplusplus)
extern "C" {
#endif  /* __cplusplus */
  uint16_t __sanitizer_unaligned_load16(const void* p);
  uint32_t __sanitizer_unaligned_load32(const void* p);
  uint64_t __sanitizer_unaligned_load64(const void* p);
  void __sanitizer_unaligned_store64(void* p, uint64_t v);
#if defined(__cplusplus)
}  /* extern "C" */
#endif  /* __cplusplus */
#define BrotliUnalignedRead16 __sanitizer_unaligned_load16
#define BrotliUnalignedRead32 __sanitizer_unaligned_load32
#define BrotliUnalignedRead64 __sanitizer_unaligned_load64
#define BrotliUnalignedWrite64 __sanitizer_unaligned_store64
#else  /* BROTLI_SANITIZED */
static BROTLI_INLINE uint16_t BrotliUnalignedRead16(const void* p) {
  return *(const uint16_t*)p;
}
static BROTLI_INLINE uint32_t BrotliUnalignedRead32(const void* p) {
  return *(const uint32_t*)p;
}
#if (BROTLI_64_BITS)
static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
  return *(const uint64_t*)p;
}
static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
  *(uint64_t*)p = v;
}
#else  /* BROTLI_64_BITS */
/* Avoid emitting LDRD / STRD, which require properly aligned address. */
/* If __attribute__(aligned) is available, use that. Otherwise, memcpy. */

#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)
typedef BROTLI_ALIGNED(1) uint64_t brotli_unaligned_uint64_t;

static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
  return (uint64_t) ((const brotli_unaligned_uint64_t*) p)[0];
}
static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
  brotli_unaligned_uint64_t* dwords = (brotli_unaligned_uint64_t*) p;
  dwords[0] = (brotli_unaligned_uint64_t) v;
}
#else /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
  uint64_t v;
  memcpy(&v, p, sizeof(uint64_t));
  return v;
}

static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
  memcpy(p, &v, sizeof(uint64_t));
}
#endif  /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
#endif  /* BROTLI_64_BITS */
#endif  /* BROTLI_SANITIZED */
#endif  /* BROTLI_ALIGNED_READ */

#if BROTLI_LITTLE_ENDIAN
/* Straight endianness. Just read / write values. */
#define BROTLI_UNALIGNED_LOAD16LE BrotliUnalignedRead16
#define BROTLI_UNALIGNED_LOAD32LE BrotliUnalignedRead32
#define BROTLI_UNALIGNED_LOAD64LE BrotliUnalignedRead64
#define BROTLI_UNALIGNED_STORE64LE BrotliUnalignedWrite64
#elif BROTLI_BIG_ENDIAN  /* BROTLI_LITTLE_ENDIAN */
/* Explain compiler to byte-swap values. */
#define BROTLI_BSWAP16_(V) ((uint16_t)( \
  (((V) & 0xFFU) << 8) | \
  (((V) >> 8) & 0xFFU)))
static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) {
  uint16_t value = BrotliUnalignedRead16(p);
  return BROTLI_BSWAP16_(value);
}
#define BROTLI_BSWAP32_(V) ( \
  (((V) & 0xFFU) << 24) | (((V) & 0xFF00U) << 8) | \
  (((V) >> 8) & 0xFF00U) | (((V) >> 24) & 0xFFU))
static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) {
  uint32_t value = BrotliUnalignedRead32(p);
  return BROTLI_BSWAP32_(value);
}
#define BROTLI_BSWAP64_(V) ( \
  (((V) & 0xFFU) << 56) | (((V) & 0xFF00U) << 40) | \
  (((V) & 0xFF0000U) << 24) | (((V) & 0xFF000000U) << 8) | \
  (((V) >> 8) & 0xFF000000U) | (((V) >> 24) & 0xFF0000U) | \
  (((V) >> 40) & 0xFF00U) | (((V) >> 56) & 0xFFU))
static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) {
  uint64_t value = BrotliUnalignedRead64(p);
  return BROTLI_BSWAP64_(value);
}
static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
  uint64_t value = BROTLI_BSWAP64_(v);
  BrotliUnalignedWrite64(p, value);
}
#else  /* BROTLI_LITTLE_ENDIAN */
/* Read / store values byte-wise; hopefully compiler will understand. */
static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) {
  const uint8_t* in = (const uint8_t*)p;
  return (uint16_t)(in[0] | (in[1] << 8));
}
static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) {
  const uint8_t* in = (const uint8_t*)p;
  uint32_t value = (uint32_t)(in[0]);
  value |= (uint32_t)(in[1]) << 8;
  value |= (uint32_t)(in[2]) << 16;
  value |= (uint32_t)(in[3]) << 24;
  return value;
}
static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) {
  const uint8_t* in = (const uint8_t*)p;
  uint64_t value = (uint64_t)(in[0]);
  value |= (uint64_t)(in[1]) << 8;
  value |= (uint64_t)(in[2]) << 16;
  value |= (uint64_t)(in[3]) << 24;
  value |= (uint64_t)(in[4]) << 32;
  value |= (uint64_t)(in[5]) << 40;
  value |= (uint64_t)(in[6]) << 48;
  value |= (uint64_t)(in[7]) << 56;
  return value;
}
static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
  uint8_t* out = (uint8_t*)p;
  out[0] = (uint8_t)v;
  out[1] = (uint8_t)(v >> 8);
  out[2] = (uint8_t)(v >> 16);
  out[3] = (uint8_t)(v >> 24);
  out[4] = (uint8_t)(v >> 32);
  out[5] = (uint8_t)(v >> 40);
  out[6] = (uint8_t)(v >> 48);
  out[7] = (uint8_t)(v >> 56);
}
#endif  /* BROTLI_LITTLE_ENDIAN */

/* BROTLI_IS_CONSTANT macros returns true for compile-time constants. */
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_constant_p, 3, 0, 1) || \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
#define BROTLI_IS_CONSTANT(x) (!!__builtin_constant_p(x))
#else
#define BROTLI_IS_CONSTANT(x) (!!0)
#endif

#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
#define BROTLI_HAS_UBFX (!!1)
#else
#define BROTLI_HAS_UBFX (!!0)
#endif

#if defined(BROTLI_ENABLE_LOG)
#define BROTLI_LOG(x) printf x
#else
#define BROTLI_LOG(x)
#endif

#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
#define BROTLI_DCHECK(x) assert(x)
static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {
  fprintf(stderr, "%s:%d (%s)\n", f, l, fn);
  fflush(stderr);
}
#define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__)
#else
#define BROTLI_DCHECK(x)
#define BROTLI_DUMP() (void)(0)
#endif

/* TODO: add appropriate icc/sunpro/arm/ibm/ti checks. */
#if (BROTLI_GNUC_VERSION_CHECK(3, 0, 0) || defined(__llvm__)) && \
    !defined(BROTLI_BUILD_NO_RBIT)
#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
/* TODO: detect ARMv6T2 and enable this code for it. */
static BROTLI_INLINE brotli_reg_t BrotliRBit(brotli_reg_t input) {
  brotli_reg_t output;
  __asm__("rbit %0, %1\n" : "=r"(output) : "r"(input));
  return output;
}
#define BROTLI_RBIT(x) BrotliRBit(x)
#endif  /* armv7 / armv8 */
#endif  /* gcc || clang */
#if !defined(BROTLI_RBIT)
static BROTLI_INLINE void BrotliRBit(void) { /* Should break build if used. */ }
#endif  /* BROTLI_RBIT */

#define BROTLI_REPEAT(N, X) {     \
  if ((N & 1) != 0) {X;}          \
  if ((N & 2) != 0) {X; X;}       \
  if ((N & 4) != 0) {X; X; X; X;} \
}

#define BROTLI_UNUSED(X) (void)(X)

#define BROTLI_MIN_MAX(T)                                                      \
  static BROTLI_INLINE T brotli_min_ ## T (T a, T b) { return a < b ? a : b; } \
  static BROTLI_INLINE T brotli_max_ ## T (T a, T b) { return a > b ? a : b; }
BROTLI_MIN_MAX(double) BROTLI_MIN_MAX(float) BROTLI_MIN_MAX(int)
BROTLI_MIN_MAX(size_t) BROTLI_MIN_MAX(uint32_t) BROTLI_MIN_MAX(uint8_t)
#undef BROTLI_MIN_MAX
#define BROTLI_MIN(T, A, B) (brotli_min_ ## T((A), (B)))
#define BROTLI_MAX(T, A, B) (brotli_max_ ## T((A), (B)))

#define BROTLI_SWAP(T, A, I, J) { \
  T __brotli_swap_tmp = (A)[(I)]; \
  (A)[(I)] = (A)[(J)];            \
  (A)[(J)] = __brotli_swap_tmp;   \
}

#if BROTLI_64_BITS
#if BROTLI_GNUC_HAS_BUILTIN(__builtin_ctzll, 3, 4, 0) || \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
#define BROTLI_TZCNT64 __builtin_ctzll
#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
#if defined(BROTLI_TARGET_X64)
#define BROTLI_TZCNT64 _tzcnt_u64
#else /* BROTLI_TARGET_X64 */
static BROTLI_INLINE uint32_t BrotliBsf64Msvc(uint64_t x) {
  uint32_t lsb;
  _BitScanForward64(&lsb, x);
  return lsb;
}
#define BROTLI_TZCNT64 BrotliBsf64Msvc
#endif /* BROTLI_TARGET_X64 */
#endif /* __builtin_ctzll */
#endif /* BROTLI_64_BITS */

#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \
    BROTLI_INTEL_VERSION_CHECK(16, 0, 0)
#define BROTLI_BSR32(x) (31u ^ (uint32_t)__builtin_clz(x))
#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0)
static BROTLI_INLINE uint32_t BrotliBsr32Msvc(uint32_t x) {
  unsigned long msb;
  _BitScanReverse(&msb, x);
  return (uint32_t)msb;
}
#define BROTLI_BSR32 BrotliBsr32Msvc
#endif /* __builtin_clz */

/* Default brotli_alloc_func */
BROTLI_COMMON_API void* BrotliDefaultAllocFunc(void* opaque, size_t size);

/* Default brotli_free_func */
BROTLI_COMMON_API void BrotliDefaultFreeFunc(void* opaque, void* address);

BROTLI_UNUSED_FUNCTION void BrotliSuppressUnusedFunctions(void) {
  BROTLI_UNUSED(&BrotliSuppressUnusedFunctions);
  BROTLI_UNUSED(&BrotliUnalignedRead16);
  BROTLI_UNUSED(&BrotliUnalignedRead32);
  BROTLI_UNUSED(&BrotliUnalignedRead64);
  BROTLI_UNUSED(&BrotliUnalignedWrite64);
  BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD16LE);
  BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD32LE);
  BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD64LE);
  BROTLI_UNUSED(&BROTLI_UNALIGNED_STORE64LE);
  BROTLI_UNUSED(&BrotliRBit);
  BROTLI_UNUSED(&brotli_min_double);
  BROTLI_UNUSED(&brotli_max_double);
  BROTLI_UNUSED(&brotli_min_float);
  BROTLI_UNUSED(&brotli_max_float);
  BROTLI_UNUSED(&brotli_min_int);
  BROTLI_UNUSED(&brotli_max_int);
  BROTLI_UNUSED(&brotli_min_size_t);
  BROTLI_UNUSED(&brotli_max_size_t);
  BROTLI_UNUSED(&brotli_min_uint32_t);
  BROTLI_UNUSED(&brotli_max_uint32_t);
  BROTLI_UNUSED(&brotli_min_uint8_t);
  BROTLI_UNUSED(&brotli_max_uint8_t);
  BROTLI_UNUSED(&BrotliDefaultAllocFunc);
  BROTLI_UNUSED(&BrotliDefaultFreeFunc);
#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG)
  BROTLI_UNUSED(&BrotliDump);
#endif
}

#endif  /* BROTLI_COMMON_PLATFORM_H_ */