2 * xxHash - Fast Hash algorithm
3 * Copyright (C) 2012-2016, Yann Collet
5 * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * You can contact the author at :
31 * - xxHash homepage: http://www.xxhash.com
32 * - xxHash source repository : https://github.com/Cyan4973/xxHash
36 /* *************************************
38 ***************************************/
39 /*!XXH_FORCE_MEMORY_ACCESS :
40 * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.
41 * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.
42 * The below switch allow to select different access method for improved performance.
43 * Method 0 (default) : use `memcpy()`. Safe and portable.
44 * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable).
45 * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.
46 * Method 2 : direct access. This method doesn't depend on compiler but violate C standard.
47 * It can generate buggy code on targets which do not support unaligned memory accesses.
48 * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
49 * See http://stackoverflow.com/a/32095106/646947 for details.
50 * Prefer these methods in priority order (0 > 1 > 2)
52 #ifndef XXH_FORCE_MEMORY_ACCESS /* can be defined externally, on command line for example */
53 # if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) )
54 # define XXH_FORCE_MEMORY_ACCESS 2
55 # elif (defined(__INTEL_COMPILER) && !defined(WIN32)) || \
56 (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7S__) ))
57 # define XXH_FORCE_MEMORY_ACCESS 1
61 /*!XXH_ACCEPT_NULL_INPUT_POINTER :
62 * If the input pointer is a null pointer, xxHash default behavior is to trigger a memory access error, since it is a bad pointer.
63 * When this option is enabled, xxHash output for null input pointers will be the same as a null-length input.
64 * By default, this option is disabled. To enable it, uncomment below define :
66 /* #define XXH_ACCEPT_NULL_INPUT_POINTER 1 */
68 /*!XXH_FORCE_NATIVE_FORMAT :
69 * By default, xxHash library provides endian-independant Hash values, based on little-endian convention.
70 * Results are therefore identical for little-endian and big-endian CPU.
71 * This comes at a performance cost for big-endian CPU, since some swapping is required to emulate little-endian format.
72 * Should endian-independance be of no importance for your application, you may set the #define below to 1,
73 * to improve speed for Big-endian CPU.
74 * This option has no impact on Little_Endian CPU.
76 #ifndef XXH_FORCE_NATIVE_FORMAT /* can be defined externally */
77 # define XXH_FORCE_NATIVE_FORMAT 0
80 /*!XXH_FORCE_ALIGN_CHECK :
81 * This is a minor performance trick, only useful with lots of very small keys.
82 * It means : check for aligned/unaligned input.
83 * The check costs one initial branch per hash; set to 0 when the input data
84 * is guaranteed to be aligned.
86 #ifndef XXH_FORCE_ALIGN_CHECK /* can be defined externally */
87 # if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)
88 # define XXH_FORCE_ALIGN_CHECK 0
90 # define XXH_FORCE_ALIGN_CHECK 1
95 /* *************************************
96 * Includes & Memory related functions
97 ***************************************/
98 /* Modify the local functions below should you wish to use some other memory routines */
99 /* for malloc(), free() */
101 static void* XXH_malloc(size_t s) { return malloc(s); }
102 static void XXH_free (void* p) { free(p); }
105 static void* XXH_memcpy(void* dest, const void* src, size_t size) { return memcpy(dest,src,size); }
107 #ifndef XXH_STATIC_LINKING_ONLY
108 # define XXH_STATIC_LINKING_ONLY
113 /* *************************************
114 * Compiler Specific Options
115 ***************************************/
116 #ifdef _MSC_VER /* Visual Studio */
117 # pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
118 # define FORCE_INLINE static __forceinline
120 # if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */
122 # define FORCE_INLINE static inline __attribute__((always_inline))
124 # define FORCE_INLINE static inline
127 # define FORCE_INLINE static
128 # endif /* __STDC_VERSION__ */
132 /* *************************************
134 ***************************************/
137 # if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
139 typedef uint8_t BYTE;
140 typedef uint16_t U16;
141 typedef uint32_t U32;
143 typedef uint64_t U64;
145 typedef unsigned char BYTE;
146 typedef unsigned short U16;
147 typedef unsigned int U32;
148 typedef signed int S32;
149 typedef unsigned long long U64; /* if your compiler doesn't support unsigned long long, replace by another 64-bit type here. Note that xxhash.h will also need to be updated. */
154 #if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2))
156 /* Force direct memory access. Only works on CPU which support unaligned memory access in hardware */
157 static U32 XXH_read32(const void* memPtr) { return *(const U32*) memPtr; }
158 static U64 XXH_read64(const void* memPtr) { return *(const U64*) memPtr; }
160 #elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1))
162 /* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
163 /* currently only defined for gcc and icc */
164 typedef union { U32 u32; U64 u64; } __attribute__((packed)) unalign;
166 static U32 XXH_read32(const void* ptr) { return ((const unalign*)ptr)->u32; }
167 static U64 XXH_read64(const void* ptr) { return ((const unalign*)ptr)->u64; }
171 /* portable and safe solution. Generally efficient.
172 * see : http://stackoverflow.com/a/32095106/646947
175 static U32 XXH_read32(const void* memPtr)
178 memcpy(&val, memPtr, sizeof(val));
182 static U64 XXH_read64(const void* memPtr)
185 memcpy(&val, memPtr, sizeof(val));
189 #endif /* XXH_FORCE_DIRECT_MEMORY_ACCESS */
192 /* ****************************************
193 * Compiler-specific Functions and Macros
194 ******************************************/
195 #define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
197 /* Note : although _rotl exists for minGW (GCC under windows), performance seems poor */
198 #if defined(_MSC_VER)
199 # define XXH_rotl32(x,r) _rotl(x,r)
200 # define XXH_rotl64(x,r) _rotl64(x,r)
202 # define XXH_rotl32(x,r) ((x << r) | (x >> (32 - r)))
203 # define XXH_rotl64(x,r) ((x << r) | (x >> (64 - r)))
206 #if defined(_MSC_VER) /* Visual Studio */
207 # define XXH_swap32 _byteswap_ulong
208 # define XXH_swap64 _byteswap_uint64
209 #elif (GCC_VERSION >= 403 && !defined(__riscv__))
210 # define XXH_swap32 __builtin_bswap32
211 # define XXH_swap64 __builtin_bswap64
213 static U32 XXH_swap32 (U32 x)
215 return ((x << 24) & 0xff000000 ) |
216 ((x << 8) & 0x00ff0000 ) |
217 ((x >> 8) & 0x0000ff00 ) |
218 ((x >> 24) & 0x000000ff );
220 static U64 XXH_swap64 (U64 x)
222 return ((x << 56) & 0xff00000000000000ULL) |
223 ((x << 40) & 0x00ff000000000000ULL) |
224 ((x << 24) & 0x0000ff0000000000ULL) |
225 ((x << 8) & 0x000000ff00000000ULL) |
226 ((x >> 8) & 0x00000000ff000000ULL) |
227 ((x >> 24) & 0x0000000000ff0000ULL) |
228 ((x >> 40) & 0x000000000000ff00ULL) |
229 ((x >> 56) & 0x00000000000000ffULL);
234 /* *************************************
235 * Architecture Macros
236 ***************************************/
237 typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianess;
239 /* XXH_CPU_LITTLE_ENDIAN can be defined externally, for example on the compiler command line */
240 #ifndef XXH_CPU_LITTLE_ENDIAN
241 static const int g_one = 1;
242 # define XXH_CPU_LITTLE_ENDIAN (*(const char*)(&g_one))
246 /* ***************************
248 *****************************/
249 typedef enum { XXH_aligned, XXH_unaligned } XXH_alignment;
251 FORCE_INLINE U32 XXH_readLE32_align(const void* ptr, XXH_endianess endian, XXH_alignment align)
253 if (align==XXH_unaligned)
254 return endian==XXH_littleEndian ? XXH_read32(ptr) : XXH_swap32(XXH_read32(ptr));
256 return endian==XXH_littleEndian ? *(const U32*)ptr : XXH_swap32(*(const U32*)ptr);
259 FORCE_INLINE U32 XXH_readLE32(const void* ptr, XXH_endianess endian)
261 return XXH_readLE32_align(ptr, endian, XXH_unaligned);
264 static U32 XXH_readBE32(const void* ptr)
266 return XXH_CPU_LITTLE_ENDIAN ? XXH_swap32(XXH_read32(ptr)) : XXH_read32(ptr);
269 FORCE_INLINE U64 XXH_readLE64_align(const void* ptr, XXH_endianess endian, XXH_alignment align)
271 if (align==XXH_unaligned)
272 return endian==XXH_littleEndian ? XXH_read64(ptr) : XXH_swap64(XXH_read64(ptr));
274 return endian==XXH_littleEndian ? *(const U64*)ptr : XXH_swap64(*(const U64*)ptr);
277 FORCE_INLINE U64 XXH_readLE64(const void* ptr, XXH_endianess endian)
279 return XXH_readLE64_align(ptr, endian, XXH_unaligned);
282 static U64 XXH_readBE64(const void* ptr)
284 return XXH_CPU_LITTLE_ENDIAN ? XXH_swap64(XXH_read64(ptr)) : XXH_read64(ptr);
288 /* *************************************
290 ***************************************/
291 #define XXH_STATIC_ASSERT(c) { enum { XXH_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
294 /* *************************************
296 ***************************************/
297 static const U32 PRIME32_1 = 2654435761U;
298 static const U32 PRIME32_2 = 2246822519U;
299 static const U32 PRIME32_3 = 3266489917U;
300 static const U32 PRIME32_4 = 668265263U;
301 static const U32 PRIME32_5 = 374761393U;
303 static const U64 PRIME64_1 = 11400714785074694791ULL;
304 static const U64 PRIME64_2 = 14029467366897019727ULL;
305 static const U64 PRIME64_3 = 1609587929392839161ULL;
306 static const U64 PRIME64_4 = 9650029242287828579ULL;
307 static const U64 PRIME64_5 = 2870177450012600261ULL;
309 XXH_PUBLIC_API unsigned XXH_versionNumber (void) { return XXH_VERSION_NUMBER; }
312 /* **************************
314 ****************************/
315 XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* restrict dstState, const XXH32_state_t* restrict srcState)
317 memcpy(dstState, srcState, sizeof(*dstState));
320 XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dstState, const XXH64_state_t* restrict srcState)
322 memcpy(dstState, srcState, sizeof(*dstState));
326 /* ***************************
327 * Simple Hash Functions
328 *****************************/
330 static U32 XXH32_round(U32 seed, U32 input)
332 seed += input * PRIME32_2;
333 seed = XXH_rotl32(seed, 13);
338 FORCE_INLINE U32 XXH32_endian_align(const void* input, size_t len, U32 seed, XXH_endianess endian, XXH_alignment align)
340 const BYTE* p = (const BYTE*)input;
341 const BYTE* bEnd = p + len;
343 #define XXH_get32bits(p) XXH_readLE32_align(p, endian, align)
345 #ifdef XXH_ACCEPT_NULL_INPUT_POINTER
348 bEnd=p=(const BYTE*)(size_t)16;
353 const BYTE* const limit = bEnd - 16;
354 U32 v1 = seed + PRIME32_1 + PRIME32_2;
355 U32 v2 = seed + PRIME32_2;
357 U32 v4 = seed - PRIME32_1;
360 v1 = XXH32_round(v1, XXH_get32bits(p)); p+=4;
361 v2 = XXH32_round(v2, XXH_get32bits(p)); p+=4;
362 v3 = XXH32_round(v3, XXH_get32bits(p)); p+=4;
363 v4 = XXH32_round(v4, XXH_get32bits(p)); p+=4;
366 h32 = XXH_rotl32(v1, 1) + XXH_rotl32(v2, 7) + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18);
368 h32 = seed + PRIME32_5;
374 h32 += XXH_get32bits(p) * PRIME32_3;
375 h32 = XXH_rotl32(h32, 17) * PRIME32_4 ;
380 h32 += (*p) * PRIME32_5;
381 h32 = XXH_rotl32(h32, 11) * PRIME32_1 ;
395 XXH_PUBLIC_API unsigned int XXH32 (const void* input, size_t len, unsigned int seed)
398 /* Simple version, good for code maintenance, but unfortunately slow for small inputs */
399 XXH32_CREATESTATE_STATIC(state);
400 XXH32_reset(state, seed);
401 XXH32_update(state, input, len);
402 return XXH32_digest(state);
404 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
406 if (XXH_FORCE_ALIGN_CHECK) {
407 if ((((size_t)input) & 3) == 0) { /* Input is 4-bytes aligned, leverage the speed benefit */
408 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
409 return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned);
411 return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned);
414 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
415 return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned);
417 return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned);
422 static U64 XXH64_round(U64 acc, U64 input)
424 acc += input * PRIME64_2;
425 acc = XXH_rotl64(acc, 31);
430 static U64 XXH64_mergeRound(U64 acc, U64 val)
432 val = XXH64_round(0, val);
434 acc = acc * PRIME64_1 + PRIME64_4;
438 FORCE_INLINE U64 XXH64_endian_align(const void* input, size_t len, U64 seed, XXH_endianess endian, XXH_alignment align)
440 const BYTE* p = (const BYTE*)input;
441 const BYTE* const bEnd = p + len;
443 #define XXH_get64bits(p) XXH_readLE64_align(p, endian, align)
445 #ifdef XXH_ACCEPT_NULL_INPUT_POINTER
448 bEnd=p=(const BYTE*)(size_t)32;
453 const BYTE* const limit = bEnd - 32;
454 U64 v1 = seed + PRIME64_1 + PRIME64_2;
455 U64 v2 = seed + PRIME64_2;
457 U64 v4 = seed - PRIME64_1;
460 v1 = XXH64_round(v1, XXH_get64bits(p)); p+=8;
461 v2 = XXH64_round(v2, XXH_get64bits(p)); p+=8;
462 v3 = XXH64_round(v3, XXH_get64bits(p)); p+=8;
463 v4 = XXH64_round(v4, XXH_get64bits(p)); p+=8;
466 h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);
467 h64 = XXH64_mergeRound(h64, v1);
468 h64 = XXH64_mergeRound(h64, v2);
469 h64 = XXH64_mergeRound(h64, v3);
470 h64 = XXH64_mergeRound(h64, v4);
473 h64 = seed + PRIME64_5;
479 U64 const k1 = XXH64_round(0, XXH_get64bits(p));
481 h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4;
486 h64 ^= (U64)(XXH_get32bits(p)) * PRIME64_1;
487 h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
492 h64 ^= (*p) * PRIME64_5;
493 h64 = XXH_rotl64(h64, 11) * PRIME64_1;
507 XXH_PUBLIC_API unsigned long long XXH64 (const void* input, size_t len, unsigned long long seed)
510 /* Simple version, good for code maintenance, but unfortunately slow for small inputs */
511 XXH64_CREATESTATE_STATIC(state);
512 XXH64_reset(state, seed);
513 XXH64_update(state, input, len);
514 return XXH64_digest(state);
516 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
518 if (XXH_FORCE_ALIGN_CHECK) {
519 if ((((size_t)input) & 7)==0) { /* Input is aligned, let's leverage the speed advantage */
520 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
521 return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned);
523 return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned);
526 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
527 return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned);
529 return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned);
534 /* **************************************************
535 * Advanced Hash Functions
536 ****************************************************/
538 XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void)
540 return (XXH32_state_t*)XXH_malloc(sizeof(XXH32_state_t));
542 XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr)
548 XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void)
550 return (XXH64_state_t*)XXH_malloc(sizeof(XXH64_state_t));
552 XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr)
561 XXH_PUBLIC_API XXH_errorcode XXH32_reset(XXH32_state_t* statePtr, unsigned int seed)
563 XXH32_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */
564 memset(&state, 0, sizeof(state)-4); /* do not write into reserved, for future removal */
565 state.v1 = seed + PRIME32_1 + PRIME32_2;
566 state.v2 = seed + PRIME32_2;
568 state.v4 = seed - PRIME32_1;
569 memcpy(statePtr, &state, sizeof(state));
574 XXH_PUBLIC_API XXH_errorcode XXH64_reset(XXH64_state_t* statePtr, unsigned long long seed)
576 XXH64_state_t state; /* using a local state to memcpy() in order to avoid strict-aliasing warnings */
577 memset(&state, 0, sizeof(state)-8); /* do not write into reserved, for future removal */
578 state.v1 = seed + PRIME64_1 + PRIME64_2;
579 state.v2 = seed + PRIME64_2;
581 state.v4 = seed - PRIME64_1;
582 memcpy(statePtr, &state, sizeof(state));
587 FORCE_INLINE XXH_errorcode XXH32_update_endian (XXH32_state_t* state, const void* input, size_t len, XXH_endianess endian)
589 const BYTE* p = (const BYTE*)input;
590 const BYTE* const bEnd = p + len;
592 #ifdef XXH_ACCEPT_NULL_INPUT_POINTER
593 if (input==NULL) return XXH_ERROR;
596 state->total_len_32 += (unsigned)len;
597 state->large_len |= (len>=16) | (state->total_len_32>=16);
599 if (state->memsize + len < 16) { /* fill in tmp buffer */
600 XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len);
601 state->memsize += (unsigned)len;
605 if (state->memsize) { /* some data left from previous update */
606 XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, 16-state->memsize);
607 { const U32* p32 = state->mem32;
608 state->v1 = XXH32_round(state->v1, XXH_readLE32(p32, endian)); p32++;
609 state->v2 = XXH32_round(state->v2, XXH_readLE32(p32, endian)); p32++;
610 state->v3 = XXH32_round(state->v3, XXH_readLE32(p32, endian)); p32++;
611 state->v4 = XXH32_round(state->v4, XXH_readLE32(p32, endian)); p32++;
613 p += 16-state->memsize;
618 const BYTE* const limit = bEnd - 16;
625 v1 = XXH32_round(v1, XXH_readLE32(p, endian)); p+=4;
626 v2 = XXH32_round(v2, XXH_readLE32(p, endian)); p+=4;
627 v3 = XXH32_round(v3, XXH_readLE32(p, endian)); p+=4;
628 v4 = XXH32_round(v4, XXH_readLE32(p, endian)); p+=4;
638 XXH_memcpy(state->mem32, p, (size_t)(bEnd-p));
639 state->memsize = (unsigned)(bEnd-p);
645 XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* state_in, const void* input, size_t len)
647 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
649 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
650 return XXH32_update_endian(state_in, input, len, XXH_littleEndian);
652 return XXH32_update_endian(state_in, input, len, XXH_bigEndian);
657 FORCE_INLINE U32 XXH32_digest_endian (const XXH32_state_t* state, XXH_endianess endian)
659 const BYTE * p = (const BYTE*)state->mem32;
660 const BYTE* const bEnd = (const BYTE*)(state->mem32) + state->memsize;
663 if (state->large_len) {
664 h32 = XXH_rotl32(state->v1, 1) + XXH_rotl32(state->v2, 7) + XXH_rotl32(state->v3, 12) + XXH_rotl32(state->v4, 18);
666 h32 = state->v3 /* == seed */ + PRIME32_5;
669 h32 += state->total_len_32;
672 h32 += XXH_readLE32(p, endian) * PRIME32_3;
673 h32 = XXH_rotl32(h32, 17) * PRIME32_4;
678 h32 += (*p) * PRIME32_5;
679 h32 = XXH_rotl32(h32, 11) * PRIME32_1;
693 XXH_PUBLIC_API unsigned int XXH32_digest (const XXH32_state_t* state_in)
695 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
697 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
698 return XXH32_digest_endian(state_in, XXH_littleEndian);
700 return XXH32_digest_endian(state_in, XXH_bigEndian);
705 /* **** XXH64 **** */
707 FORCE_INLINE XXH_errorcode XXH64_update_endian (XXH64_state_t* state, const void* input, size_t len, XXH_endianess endian)
709 const BYTE* p = (const BYTE*)input;
710 const BYTE* const bEnd = p + len;
712 #ifdef XXH_ACCEPT_NULL_INPUT_POINTER
713 if (input==NULL) return XXH_ERROR;
716 state->total_len += len;
718 if (state->memsize + len < 32) { /* fill in tmp buffer */
719 XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, len);
720 state->memsize += (U32)len;
724 if (state->memsize) { /* tmp buffer is full */
725 XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, 32-state->memsize);
726 state->v1 = XXH64_round(state->v1, XXH_readLE64(state->mem64+0, endian));
727 state->v2 = XXH64_round(state->v2, XXH_readLE64(state->mem64+1, endian));
728 state->v3 = XXH64_round(state->v3, XXH_readLE64(state->mem64+2, endian));
729 state->v4 = XXH64_round(state->v4, XXH_readLE64(state->mem64+3, endian));
730 p += 32-state->memsize;
735 const BYTE* const limit = bEnd - 32;
742 v1 = XXH64_round(v1, XXH_readLE64(p, endian)); p+=8;
743 v2 = XXH64_round(v2, XXH_readLE64(p, endian)); p+=8;
744 v3 = XXH64_round(v3, XXH_readLE64(p, endian)); p+=8;
745 v4 = XXH64_round(v4, XXH_readLE64(p, endian)); p+=8;
755 XXH_memcpy(state->mem64, p, (size_t)(bEnd-p));
756 state->memsize = (unsigned)(bEnd-p);
762 XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* state_in, const void* input, size_t len)
764 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
766 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
767 return XXH64_update_endian(state_in, input, len, XXH_littleEndian);
769 return XXH64_update_endian(state_in, input, len, XXH_bigEndian);
774 FORCE_INLINE U64 XXH64_digest_endian (const XXH64_state_t* state, XXH_endianess endian)
776 const BYTE * p = (const BYTE*)state->mem64;
777 const BYTE* const bEnd = (const BYTE*)state->mem64 + state->memsize;
780 if (state->total_len >= 32) {
781 U64 const v1 = state->v1;
782 U64 const v2 = state->v2;
783 U64 const v3 = state->v3;
784 U64 const v4 = state->v4;
786 h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);
787 h64 = XXH64_mergeRound(h64, v1);
788 h64 = XXH64_mergeRound(h64, v2);
789 h64 = XXH64_mergeRound(h64, v3);
790 h64 = XXH64_mergeRound(h64, v4);
792 h64 = state->v3 + PRIME64_5;
795 h64 += (U64) state->total_len;
798 U64 const k1 = XXH64_round(0, XXH_readLE64(p, endian));
800 h64 = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4;
805 h64 ^= (U64)(XXH_readLE32(p, endian)) * PRIME64_1;
806 h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
811 h64 ^= (*p) * PRIME64_5;
812 h64 = XXH_rotl64(h64, 11) * PRIME64_1;
826 XXH_PUBLIC_API unsigned long long XXH64_digest (const XXH64_state_t* state_in)
828 XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
830 if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
831 return XXH64_digest_endian(state_in, XXH_littleEndian);
833 return XXH64_digest_endian(state_in, XXH_bigEndian);
837 /* **************************
838 * Canonical representation
839 ****************************/
841 /*! Default XXH result types are basic unsigned 32 and 64 bits.
842 * The canonical representation follows human-readable write convention, aka big-endian (large digits first).
843 * These functions allow transformation of hash result into and from its canonical format.
844 * This way, hash values can be written into a file or buffer, and remain comparable across different systems and programs.
847 XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash)
849 XXH_STATIC_ASSERT(sizeof(XXH32_canonical_t) == sizeof(XXH32_hash_t));
850 if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap32(hash);
851 memcpy(dst, &hash, sizeof(*dst));
854 XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash)
856 XXH_STATIC_ASSERT(sizeof(XXH64_canonical_t) == sizeof(XXH64_hash_t));
857 if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap64(hash);
858 memcpy(dst, &hash, sizeof(*dst));
861 XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src)
863 return XXH_readBE32(src);
866 XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src)
868 return XXH_readBE64(src);