Commit | Line | Data |
---|---|---|
4d3a042d YO |
1 | /* hash a key |
2 | *-------------------------------------------------------------------------------------- | |
3 | * The "hash seed" feature was added in Perl 5.8.1 to perturb the results | |
4 | * to avoid "algorithmic complexity attacks". | |
5 | * | |
6 | * If USE_HASH_SEED is defined, hash randomisation is done by default | |
7 | * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done | |
8 | * only if the environment variable PERL_HASH_SEED is set. | |
9 | * (see also perl.c:perl_parse() and S_init_tls_and_interp() and util.c:get_hash_seed()) | |
10 | */ | |
11 | ||
12 | #ifndef PERL_SEEN_HV_FUNC_H /* compile once */ | |
13 | #define PERL_SEEN_HV_FUNC_H | |
14 | ||
15 | #if !( 0 \ | |
e6b54db6 | 16 | || defined(PERL_HASH_FUNC_SIPHASH) \ |
4d3a042d YO |
17 | || defined(PERL_HASH_FUNC_SDBM) \ |
18 | || defined(PERL_HASH_FUNC_DJB2) \ | |
19 | || defined(PERL_HASH_FUNC_SUPERFAST) \ | |
20 | || defined(PERL_HASH_FUNC_MURMUR3) \ | |
21 | || defined(PERL_HASH_FUNC_ONE_AT_A_TIME) \ | |
b1300a73 | 22 | || defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD) \ |
4d3a042d | 23 | || defined(PERL_HASH_FUNC_ONE_AT_A_TIME_OLD) \ |
7e0dd61b YO |
24 | || defined(PERL_HASH_FUNC_MURMUR_HASH_64A) \ |
25 | || defined(PERL_HASH_FUNC_MURMUR_HASH_64B) \ | |
4d3a042d | 26 | ) |
b1300a73 | 27 | #define PERL_HASH_FUNC_ONE_AT_A_TIME_HARD |
4d3a042d | 28 | #endif |
4d3a042d YO |
29 | |
30 | #if defined(PERL_HASH_FUNC_SIPHASH) | |
31 | # define PERL_HASH_FUNC "SIPHASH_2_4" | |
32 | # define PERL_HASH_SEED_BYTES 16 | |
3d53a8ea | 33 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_siphash_2_4((seed),(U8*)(str),(len)) |
4d3a042d YO |
34 | #elif defined(PERL_HASH_FUNC_SUPERFAST) |
35 | # define PERL_HASH_FUNC "SUPERFAST" | |
36 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 37 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_superfast((seed),(U8*)(str),(len)) |
4d3a042d YO |
38 | #elif defined(PERL_HASH_FUNC_MURMUR3) |
39 | # define PERL_HASH_FUNC "MURMUR3" | |
40 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 41 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_murmur3((seed),(U8*)(str),(len)) |
4d3a042d YO |
42 | #elif defined(PERL_HASH_FUNC_DJB2) |
43 | # define PERL_HASH_FUNC "DJB2" | |
44 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 45 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_djb2((seed),(U8*)(str),(len)) |
4d3a042d YO |
46 | #elif defined(PERL_HASH_FUNC_SDBM) |
47 | # define PERL_HASH_FUNC "SDBM" | |
48 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 49 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_sdbm((seed),(U8*)(str),(len)) |
b1300a73 YO |
50 | #elif defined(PERL_HASH_FUNC_ONE_AT_A_TIME_HARD) |
51 | # define PERL_HASH_FUNC "ONE_AT_A_TIME_HARD" | |
52 | # define PERL_HASH_SEED_BYTES 8 | |
3d53a8ea | 53 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_one_at_a_time_hard((seed),(U8*)(str),(len)) |
4d3a042d YO |
54 | #elif defined(PERL_HASH_FUNC_ONE_AT_A_TIME) |
55 | # define PERL_HASH_FUNC "ONE_AT_A_TIME" | |
56 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 57 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_one_at_a_time((seed),(U8*)(str),(len)) |
4d3a042d YO |
58 | #elif defined(PERL_HASH_FUNC_ONE_AT_A_TIME_OLD) |
59 | # define PERL_HASH_FUNC "ONE_AT_A_TIME_OLD" | |
60 | # define PERL_HASH_SEED_BYTES 4 | |
3d53a8ea | 61 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_old_one_at_a_time((seed),(U8*)(str),(len)) |
7e0dd61b YO |
62 | #elif defined(PERL_HASH_FUNC_MURMUR_HASH_64A) |
63 | # define PERL_HASH_FUNC "MURMUR_HASH_64A" | |
64 | # define PERL_HASH_SEED_BYTES 8 | |
65 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_murmur_hash_64a((seed),(U8*)(str),(len)) | |
66 | #elif defined(PERL_HASH_FUNC_MURMUR_HASH_64B) | |
67 | # define PERL_HASH_FUNC "MURMUR_HASH_64B" | |
68 | # define PERL_HASH_SEED_BYTES 8 | |
69 | # define PERL_HASH_WITH_SEED(seed,hash,str,len) (hash)= S_perl_hash_murmur_hash_64b((seed),(U8*)(str),(len)) | |
4d3a042d YO |
70 | #endif |
71 | ||
3d53a8ea | 72 | #ifndef PERL_HASH_WITH_SEED |
4d3a042d YO |
73 | #error "No hash function defined!" |
74 | #endif | |
75 | #ifndef PERL_HASH_SEED_BYTES | |
76 | #error "PERL_HASH_SEED_BYTES not defined" | |
77 | #endif | |
78 | #ifndef PERL_HASH_FUNC | |
79 | #error "PERL_HASH_FUNC not defined" | |
80 | #endif | |
81 | ||
82 | #ifndef PERL_HASH_SEED | |
83 | # if defined(USE_HASH_SEED) || defined(USE_HASH_SEED_EXPLICIT) | |
84 | # define PERL_HASH_SEED PL_hash_seed | |
85 | # elif PERL_HASH_SEED_BYTES == 4 | |
86 | # define PERL_HASH_SEED "PeRl" | |
87 | # elif PERL_HASH_SEED_BYTES == 16 | |
88 | # define PERL_HASH_SEED "PeRlHaShhAcKpErl" | |
89 | # else | |
90 | # error "No PERL_HASH_SEED definition for " PERL_HASH_FUNC | |
91 | # endif | |
92 | #endif | |
93 | ||
3d53a8ea YO |
94 | #define PERL_HASH(hash,str,len) PERL_HASH_WITH_SEED(PERL_HASH_SEED,hash,str,len) |
95 | ||
4d3a042d YO |
96 | /*----------------------------------------------------------------------------- |
97 | * Endianess, misalignment capabilities and util macros | |
98 | * | |
99 | * The following 3 macros are defined in this section. The other macros defined | |
100 | * are only needed to help derive these 3. | |
101 | * | |
102 | * U8TO32_LE(x) Read a little endian unsigned 32-bit int | |
103 | * UNALIGNED_SAFE Defined if READ_UINT32 works on non-word boundaries | |
104 | * ROTL32(x,r) Rotate x left by r bits | |
105 | */ | |
106 | ||
107 | #if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \ | |
0a35fd8a | 108 | || defined(_MSC_VER) || defined (__TURBOC__) |
4d3a042d YO |
109 | #define U8TO16_LE(d) (*((const U16 *) (d))) |
110 | #endif | |
111 | ||
112 | #if !defined (U8TO16_LE) | |
113 | #define U8TO16_LE(d) ((((const U8 *)(d))[1] << 8)\ | |
114 | +((const U8 *)(d))[0]) | |
115 | #endif | |
116 | ||
117 | ||
118 | /* Now find best way we can to READ_UINT32 */ | |
119 | #if (BYTEORDER == 0x1234 || BYTEORDER == 0x12345678) && U32SIZE == 4 | |
120 | /* CPU endian matches murmurhash algorithm, so read 32-bit word directly */ | |
121 | #define U8TO32_LE(ptr) (*((U32*)(ptr))) | |
122 | #elif BYTEORDER == 0x4321 || BYTEORDER == 0x87654321 | |
123 | /* TODO: Add additional cases below where a compiler provided bswap32 is available */ | |
124 | #if defined(__GNUC__) && (__GNUC__>4 || (__GNUC__==4 && __GNUC_MINOR__>=3)) | |
125 | #define U8TO32_LE(ptr) (__builtin_bswap32(*((U32*)(ptr)))) | |
126 | #else | |
127 | /* Without a known fast bswap32 we're just as well off doing this */ | |
128 | #define U8TO32_LE(ptr) (ptr[0]|ptr[1]<<8|ptr[2]<<16|ptr[3]<<24) | |
129 | #define UNALIGNED_SAFE | |
130 | #endif | |
131 | #else | |
132 | /* Unknown endianess so last resort is to read individual bytes */ | |
133 | #define U8TO32_LE(ptr) (ptr[0]|ptr[1]<<8|ptr[2]<<16|ptr[3]<<24) | |
134 | /* Since we're not doing word-reads we can skip the messing about with realignment */ | |
135 | #define UNALIGNED_SAFE | |
136 | #endif | |
137 | ||
b716320d YO |
138 | #ifdef HAS_QUAD |
139 | #ifndef U64TYPE | |
140 | /* This probably isn't going to work, but failing with a compiler error due to | |
141 | lack of uint64_t is no worse than failing right now with an #error. */ | |
142 | #define U64TYPE uint64_t | |
143 | #endif | |
144 | #endif | |
145 | ||
146 | /* Find best way to ROTL32/ROTL64 */ | |
4d3a042d YO |
147 | #if defined(_MSC_VER) |
148 | #include <stdlib.h> /* Microsoft put _rotl declaration in here */ | |
149 | #define ROTL32(x,r) _rotl(x,r) | |
b716320d YO |
150 | #ifdef HAS_QUAD |
151 | #define ROTL64(x,r) _rotl64(x,r) | |
152 | #endif | |
4d3a042d YO |
153 | #else |
154 | /* gcc recognises this code and generates a rotate instruction for CPUs with one */ | |
155 | #define ROTL32(x,r) (((U32)x << r) | ((U32)x >> (32 - r))) | |
b716320d YO |
156 | #ifdef HAS_QUAD |
157 | #define ROTL64(x,r) (((U64TYPE)x << r) | ((U64TYPE)x >> (64 - r))) | |
158 | #endif | |
4d3a042d YO |
159 | #endif |
160 | ||
161 | ||
b716320d YO |
162 | #ifdef UV_IS_QUAD |
163 | #define ROTL_UV(x,r) ROTL64(x,r) | |
164 | #else | |
165 | #define ROTL_UV(x,r) ROTL32(x,r) | |
166 | #endif | |
167 | ||
4d3a042d YO |
168 | /* This is SipHash by Jean-Philippe Aumasson and Daniel J. Bernstein. |
169 | * The authors claim it is relatively secure compared to the alternatives | |
170 | * and that performance wise it is a suitable hash for languages like Perl. | |
171 | * See: | |
172 | * | |
173 | * https://www.131002.net/siphash/ | |
174 | * | |
175 | * This implementation seems to perform slightly slower than one-at-a-time for | |
176 | * short keys, but degrades slower for longer keys. Murmur Hash outperforms it | |
177 | * regardless of keys size. | |
178 | * | |
179 | * It is 64 bit only. | |
180 | */ | |
181 | ||
182 | #ifdef HAS_QUAD | |
183 | ||
4d3a042d YO |
184 | #define U8TO64_LE(p) \ |
185 | (((U64TYPE)((p)[0]) ) | \ | |
186 | ((U64TYPE)((p)[1]) << 8) | \ | |
187 | ((U64TYPE)((p)[2]) << 16) | \ | |
188 | ((U64TYPE)((p)[3]) << 24) | \ | |
189 | ((U64TYPE)((p)[4]) << 32) | \ | |
190 | ((U64TYPE)((p)[5]) << 40) | \ | |
191 | ((U64TYPE)((p)[6]) << 48) | \ | |
192 | ((U64TYPE)((p)[7]) << 56)) | |
193 | ||
194 | #define SIPROUND \ | |
195 | do { \ | |
196 | v0 += v1; v1=ROTL64(v1,13); v1 ^= v0; v0=ROTL64(v0,32); \ | |
197 | v2 += v3; v3=ROTL64(v3,16); v3 ^= v2; \ | |
198 | v0 += v3; v3=ROTL64(v3,21); v3 ^= v0; \ | |
199 | v2 += v1; v1=ROTL64(v1,17); v1 ^= v2; v2=ROTL64(v2,32); \ | |
200 | } while(0) | |
201 | ||
202 | /* SipHash-2-4 */ | |
203 | ||
204 | PERL_STATIC_INLINE U32 | |
205 | S_perl_hash_siphash_2_4(const unsigned char * const seed, const unsigned char *in, const STRLEN inlen) { | |
206 | /* "somepseudorandomlygeneratedbytes" */ | |
f4e3fd26 JH |
207 | U64TYPE v0 = UINT64_C(0x736f6d6570736575); |
208 | U64TYPE v1 = UINT64_C(0x646f72616e646f6d); | |
209 | U64TYPE v2 = UINT64_C(0x6c7967656e657261); | |
210 | U64TYPE v3 = UINT64_C(0x7465646279746573); | |
4d3a042d YO |
211 | |
212 | U64TYPE b; | |
213 | U64TYPE k0 = ((U64TYPE*)seed)[0]; | |
214 | U64TYPE k1 = ((U64TYPE*)seed)[1]; | |
215 | U64TYPE m; | |
216 | const int left = inlen & 7; | |
217 | const U8 *end = in + inlen - left; | |
218 | ||
219 | b = ( ( U64TYPE )(inlen) ) << 56; | |
220 | v3 ^= k1; | |
221 | v2 ^= k0; | |
222 | v1 ^= k1; | |
223 | v0 ^= k0; | |
224 | ||
225 | for ( ; in != end; in += 8 ) | |
226 | { | |
227 | m = U8TO64_LE( in ); | |
228 | v3 ^= m; | |
229 | SIPROUND; | |
230 | SIPROUND; | |
231 | v0 ^= m; | |
232 | } | |
233 | ||
234 | switch( left ) | |
235 | { | |
236 | case 7: b |= ( ( U64TYPE )in[ 6] ) << 48; | |
237 | case 6: b |= ( ( U64TYPE )in[ 5] ) << 40; | |
238 | case 5: b |= ( ( U64TYPE )in[ 4] ) << 32; | |
239 | case 4: b |= ( ( U64TYPE )in[ 3] ) << 24; | |
240 | case 3: b |= ( ( U64TYPE )in[ 2] ) << 16; | |
241 | case 2: b |= ( ( U64TYPE )in[ 1] ) << 8; | |
242 | case 1: b |= ( ( U64TYPE )in[ 0] ); break; | |
243 | case 0: break; | |
244 | } | |
245 | ||
246 | v3 ^= b; | |
247 | SIPROUND; | |
248 | SIPROUND; | |
249 | v0 ^= b; | |
250 | ||
251 | v2 ^= 0xff; | |
252 | SIPROUND; | |
253 | SIPROUND; | |
254 | SIPROUND; | |
255 | SIPROUND; | |
256 | b = v0 ^ v1 ^ v2 ^ v3; | |
257 | return (U32)(b & U32_MAX); | |
258 | } | |
259 | #endif /* defined(HAS_QUAD) */ | |
260 | ||
261 | /* FYI: This is the "Super-Fast" algorithm mentioned by Bob Jenkins in | |
262 | * (http://burtleburtle.net/bob/hash/doobs.html) | |
263 | * It is by Paul Hsieh (c) 2004 and is analysed here | |
264 | * http://www.azillionmonkeys.com/qed/hash.html | |
265 | * license terms are here: | |
266 | * http://www.azillionmonkeys.com/qed/weblicense.html | |
267 | */ | |
268 | ||
3efdcc9c | 269 | |
4d3a042d YO |
270 | PERL_STATIC_INLINE U32 |
271 | S_perl_hash_superfast(const unsigned char * const seed, const unsigned char *str, STRLEN len) { | |
b4045391 | 272 | U32 hash = *((U32*)seed) + (U32)len; |
4d3a042d YO |
273 | U32 tmp; |
274 | int rem= len & 3; | |
275 | len >>= 2; | |
276 | ||
277 | for (;len > 0; len--) { | |
278 | hash += U8TO16_LE (str); | |
279 | tmp = (U8TO16_LE (str+2) << 11) ^ hash; | |
280 | hash = (hash << 16) ^ tmp; | |
281 | str += 2 * sizeof (U16); | |
282 | hash += hash >> 11; | |
283 | } | |
284 | ||
285 | /* Handle end cases */ | |
286 | switch (rem) { \ | |
287 | case 3: hash += U8TO16_LE (str); | |
288 | hash ^= hash << 16; | |
289 | hash ^= str[sizeof (U16)] << 18; | |
290 | hash += hash >> 11; | |
291 | break; | |
292 | case 2: hash += U8TO16_LE (str); | |
293 | hash ^= hash << 11; | |
294 | hash += hash >> 17; | |
295 | break; | |
296 | case 1: hash += *str; | |
297 | hash ^= hash << 10; | |
298 | hash += hash >> 1; | |
299 | } | |
300 | /* Force "avalanching" of final 127 bits */ | |
301 | hash ^= hash << 3; | |
302 | hash += hash >> 5; | |
303 | hash ^= hash << 4; | |
304 | hash += hash >> 17; | |
305 | hash ^= hash << 25; | |
306 | return (hash + (hash >> 6)); | |
307 | } | |
3efdcc9c | 308 | |
4d3a042d YO |
309 | |
310 | /*----------------------------------------------------------------------------- | |
311 | * MurmurHash3 was written by Austin Appleby, and is placed in the public | |
312 | * domain. | |
313 | * | |
314 | * This implementation was originally written by Shane Day, and is also public domain, | |
315 | * and was modified to function as a macro similar to other perl hash functions by | |
316 | * Yves Orton. | |
317 | * | |
318 | * This is a portable ANSI C implementation of MurmurHash3_x86_32 (Murmur3A) | |
319 | * with support for progressive processing. | |
320 | * | |
321 | * If you want to understand the MurmurHash algorithm you would be much better | |
322 | * off reading the original source. Just point your browser at: | |
323 | * http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp | |
324 | * | |
325 | * How does it work? | |
326 | * | |
327 | * We can only process entire 32 bit chunks of input, except for the very end | |
328 | * that may be shorter. | |
329 | * | |
330 | * To handle endianess I simply use a macro that reads a U32 and define | |
331 | * that macro to be a direct read on little endian machines, a read and swap | |
332 | * on big endian machines, or a byte-by-byte read if the endianess is unknown. | |
333 | */ | |
334 | ||
3efdcc9c | 335 | |
4d3a042d YO |
336 | /*----------------------------------------------------------------------------- |
337 | * Core murmurhash algorithm macros */ | |
338 | ||
339 | #define MURMUR_C1 (0xcc9e2d51) | |
340 | #define MURMUR_C2 (0x1b873593) | |
341 | #define MURMUR_C3 (0xe6546b64) | |
342 | #define MURMUR_C4 (0x85ebca6b) | |
343 | #define MURMUR_C5 (0xc2b2ae35) | |
344 | ||
345 | /* This is the main processing body of the algorithm. It operates | |
346 | * on each full 32-bits of input. */ | |
347 | #define MURMUR_DOBLOCK(h1, k1) STMT_START { \ | |
348 | k1 *= MURMUR_C1; \ | |
349 | k1 = ROTL32(k1,15); \ | |
350 | k1 *= MURMUR_C2; \ | |
351 | \ | |
352 | h1 ^= k1; \ | |
353 | h1 = ROTL32(h1,13); \ | |
354 | h1 = h1 * 5 + MURMUR_C3; \ | |
355 | } STMT_END | |
356 | ||
357 | ||
358 | /* Append unaligned bytes to carry, forcing hash churn if we have 4 bytes */ | |
359 | /* cnt=bytes to process, h1=name of h1 var, c=carry, n=bytes in c, ptr/len=payload */ | |
360 | #define MURMUR_DOBYTES(cnt, h1, c, n, ptr, len) STMT_START { \ | |
361 | int MURMUR_DOBYTES_i = cnt; \ | |
362 | while(MURMUR_DOBYTES_i--) { \ | |
363 | c = c>>8 | *ptr++<<24; \ | |
364 | n++; len--; \ | |
365 | if(n==4) { \ | |
366 | MURMUR_DOBLOCK(h1, c); \ | |
367 | n = 0; \ | |
368 | } \ | |
369 | } \ | |
370 | } STMT_END | |
371 | ||
372 | ||
373 | /* now we create the hash function */ | |
374 | PERL_STATIC_INLINE U32 | |
375 | S_perl_hash_murmur3(const unsigned char * const seed, const unsigned char *ptr, STRLEN len) { | |
376 | U32 h1 = *((U32*)seed); | |
377 | U32 k1; | |
378 | U32 carry = 0; | |
379 | ||
380 | const unsigned char *end; | |
381 | int bytes_in_carry = 0; /* bytes in carry */ | |
b4045391 | 382 | I32 total_length= (I32)len; |
4d3a042d YO |
383 | |
384 | #if defined(UNALIGNED_SAFE) | |
385 | /* Handle carry: commented out as its only used in incremental mode - it never fires for us | |
386 | int i = (4-n) & 3; | |
387 | if(i && i <= len) { | |
388 | MURMUR_DOBYTES(i, h1, carry, bytes_in_carry, ptr, len); | |
389 | } | |
390 | */ | |
391 | ||
392 | /* This CPU handles unaligned word access */ | |
393 | /* Process 32-bit chunks */ | |
394 | end = ptr + len/4*4; | |
395 | for( ; ptr < end ; ptr+=4) { | |
396 | k1 = U8TO32_LE(ptr); | |
397 | MURMUR_DOBLOCK(h1, k1); | |
398 | } | |
399 | #else | |
400 | /* This CPU does not handle unaligned word access */ | |
401 | ||
402 | /* Consume enough so that the next data byte is word aligned */ | |
c8523631 RB |
403 | STRLEN i = -PTR2IV(ptr) & 3; |
404 | if(i && i <= len) { | |
b4045391 | 405 | MURMUR_DOBYTES((int)i, h1, carry, bytes_in_carry, ptr, len); |
4d3a042d YO |
406 | } |
407 | ||
408 | /* We're now aligned. Process in aligned blocks. Specialise for each possible carry count */ | |
409 | end = ptr + len/4*4; | |
410 | switch(bytes_in_carry) { /* how many bytes in carry */ | |
411 | case 0: /* c=[----] w=[3210] b=[3210]=w c'=[----] */ | |
412 | for( ; ptr < end ; ptr+=4) { | |
413 | k1 = U8TO32_LE(ptr); | |
414 | MURMUR_DOBLOCK(h1, k1); | |
415 | } | |
416 | break; | |
417 | case 1: /* c=[0---] w=[4321] b=[3210]=c>>24|w<<8 c'=[4---] */ | |
418 | for( ; ptr < end ; ptr+=4) { | |
419 | k1 = carry>>24; | |
420 | carry = U8TO32_LE(ptr); | |
421 | k1 |= carry<<8; | |
422 | MURMUR_DOBLOCK(h1, k1); | |
423 | } | |
424 | break; | |
425 | case 2: /* c=[10--] w=[5432] b=[3210]=c>>16|w<<16 c'=[54--] */ | |
426 | for( ; ptr < end ; ptr+=4) { | |
427 | k1 = carry>>16; | |
428 | carry = U8TO32_LE(ptr); | |
429 | k1 |= carry<<16; | |
430 | MURMUR_DOBLOCK(h1, k1); | |
431 | } | |
432 | break; | |
433 | case 3: /* c=[210-] w=[6543] b=[3210]=c>>8|w<<24 c'=[654-] */ | |
434 | for( ; ptr < end ; ptr+=4) { | |
435 | k1 = carry>>8; | |
436 | carry = U8TO32_LE(ptr); | |
437 | k1 |= carry<<24; | |
438 | MURMUR_DOBLOCK(h1, k1); | |
439 | } | |
440 | } | |
441 | #endif | |
442 | /* Advance over whole 32-bit chunks, possibly leaving 1..3 bytes */ | |
443 | len -= len/4*4; | |
444 | ||
445 | /* Append any remaining bytes into carry */ | |
b4045391 | 446 | MURMUR_DOBYTES((int)len, h1, carry, bytes_in_carry, ptr, len); |
4d3a042d YO |
447 | |
448 | if (bytes_in_carry) { | |
449 | k1 = carry >> ( 4 - bytes_in_carry ) * 8; | |
450 | k1 *= MURMUR_C1; | |
451 | k1 = ROTL32(k1,15); | |
452 | k1 *= MURMUR_C2; | |
453 | h1 ^= k1; | |
454 | } | |
455 | h1 ^= total_length; | |
456 | ||
457 | /* fmix */ | |
458 | h1 ^= h1 >> 16; | |
459 | h1 *= MURMUR_C4; | |
460 | h1 ^= h1 >> 13; | |
461 | h1 *= MURMUR_C5; | |
462 | h1 ^= h1 >> 16; | |
463 | return h1; | |
464 | } | |
465 | ||
3efdcc9c | 466 | |
4d3a042d YO |
467 | PERL_STATIC_INLINE U32 |
468 | S_perl_hash_djb2(const unsigned char * const seed, const unsigned char *str, const STRLEN len) { | |
469 | const unsigned char * const end = (const unsigned char *)str + len; | |
b4045391 | 470 | U32 hash = *((U32*)seed) + (U32)len; |
4d3a042d YO |
471 | while (str < end) { |
472 | hash = ((hash << 5) + hash) + *str++; | |
473 | } | |
474 | return hash; | |
475 | } | |
476 | ||
477 | PERL_STATIC_INLINE U32 | |
478 | S_perl_hash_sdbm(const unsigned char * const seed, const unsigned char *str, const STRLEN len) { | |
479 | const unsigned char * const end = (const unsigned char *)str + len; | |
b4045391 | 480 | U32 hash = *((U32*)seed) + (U32)len; |
4d3a042d YO |
481 | while (str < end) { |
482 | hash = (hash << 6) + (hash << 16) - hash + *str++; | |
483 | } | |
484 | return hash; | |
485 | } | |
486 | ||
fab3d107 DD |
487 | /* - ONE_AT_A_TIME_HARD is the 5.17+ recommend ONE_AT_A_TIME algorithm |
488 | * - ONE_AT_A_TIME_OLD is the unmodified 5.16 and older algorithm | |
489 | * - ONE_AT_A_TIME is a 5.17+ tweak of ONE_AT_A_TIME_OLD to | |
490 | * prevent strings of only \0 but different lengths from colliding | |
491 | * | |
492 | * Security-wise, from best to worst, | |
493 | * ONE_AT_A_TIME_HARD > ONE_AT_A_TIME > ONE_AT_A_TIME_OLD | |
494 | * There is a big drop-off in security between ONE_AT_A_TIME_HARD and | |
495 | * ONE_AT_A_TIME | |
496 | * */ | |
4d3a042d | 497 | |
b1300a73 | 498 | /* This is the "One-at-a-Time" algorithm by Bob Jenkins |
4d3a042d | 499 | * from requirements by Colin Plumb. |
b1300a73 YO |
500 | * (http://burtleburtle.net/bob/hash/doobs.html) |
501 | * With seed/len tweak. | |
502 | * */ | |
4d3a042d YO |
503 | PERL_STATIC_INLINE U32 |
504 | S_perl_hash_one_at_a_time(const unsigned char * const seed, const unsigned char *str, const STRLEN len) { | |
505 | const unsigned char * const end = (const unsigned char *)str + len; | |
b4045391 | 506 | U32 hash = *((U32*)seed) + (U32)len; |
4d3a042d YO |
507 | while (str < end) { |
508 | hash += *str++; | |
509 | hash += (hash << 10); | |
510 | hash ^= (hash >> 6); | |
511 | } | |
512 | hash += (hash << 3); | |
513 | hash ^= (hash >> 11); | |
514 | return (hash + (hash << 15)); | |
515 | } | |
516 | ||
b1300a73 YO |
517 | /* Derived from "One-at-a-Time" algorithm by Bob Jenkins */ |
518 | PERL_STATIC_INLINE U32 | |
519 | S_perl_hash_one_at_a_time_hard(const unsigned char * const seed, const unsigned char *str, const STRLEN len) { | |
520 | const unsigned char * const end = (const unsigned char *)str + len; | |
b4045391 | 521 | U32 hash = *((U32*)seed) + (U32)len; |
b1300a73 YO |
522 | |
523 | while (str < end) { | |
524 | hash += (hash << 10); | |
525 | hash ^= (hash >> 6); | |
526 | hash += *str++; | |
527 | } | |
528 | ||
529 | hash += (hash << 10); | |
530 | hash ^= (hash >> 6); | |
531 | hash += seed[4]; | |
532 | ||
533 | hash += (hash << 10); | |
534 | hash ^= (hash >> 6); | |
535 | hash += seed[5]; | |
536 | ||
537 | hash += (hash << 10); | |
538 | hash ^= (hash >> 6); | |
539 | hash += seed[6]; | |
540 | ||
541 | hash += (hash << 10); | |
542 | hash ^= (hash >> 6); | |
543 | hash += seed[7]; | |
544 | ||
545 | hash += (hash << 10); | |
546 | hash ^= (hash >> 6); | |
547 | ||
548 | hash += (hash << 3); | |
549 | hash ^= (hash >> 11); | |
550 | return (hash + (hash << 15)); | |
551 | } | |
552 | ||
4d3a042d YO |
553 | PERL_STATIC_INLINE U32 |
554 | S_perl_hash_old_one_at_a_time(const unsigned char * const seed, const unsigned char *str, const STRLEN len) { | |
555 | const unsigned char * const end = (const unsigned char *)str + len; | |
556 | U32 hash = *((U32*)seed); | |
557 | while (str < end) { | |
558 | hash += *str++; | |
559 | hash += (hash << 10); | |
560 | hash ^= (hash >> 6); | |
561 | } | |
562 | hash += (hash << 3); | |
563 | hash ^= (hash >> 11); | |
564 | return (hash + (hash << 15)); | |
565 | } | |
566 | ||
7e0dd61b YO |
567 | #ifdef PERL_HASH_FUNC_MURMUR_HASH_64A |
568 | /* This code is from Austin Appleby and is in the public domain. | |
569 | Altered by Yves Orton to match Perl's hash interface, and to | |
570 | return a 32 bit hash. | |
571 | ||
572 | Note uses unaligned 64 bit loads - will NOT work on machines with | |
573 | strict alginment requirements. | |
574 | ||
575 | Also this code may not be suitable for big-endian machines. | |
576 | */ | |
577 | ||
578 | /* a 64 bit hash where we only use the low 32 bits */ | |
579 | PERL_STATIC_INLINE U32 | |
580 | S_perl_hash_murmur_hash_64a (const unsigned char * const seed, const unsigned char *str, const STRLEN len) | |
581 | { | |
582 | const U64TYPE m = 0xc6a4a7935bd1e995; | |
583 | const int r = 47; | |
584 | U64TYPE h = *((U64TYPE*)seed) ^ len; | |
585 | const U64TYPE * data = (const U64TYPE *)str; | |
586 | const U64TYPE * end = data + (len/8); | |
587 | const unsigned char * data2; | |
588 | ||
589 | while(data != end) | |
590 | { | |
591 | U64TYPE k = *data++; | |
592 | ||
593 | k *= m; | |
594 | k ^= k >> r; | |
595 | k *= m; | |
596 | ||
597 | h ^= k; | |
598 | h *= m; | |
599 | } | |
600 | ||
601 | data2 = (const unsigned char *)data; | |
602 | ||
603 | switch(len & 7) | |
604 | { | |
605 | case 7: h ^= (U64TYPE)(data2[6]) << 48; /* fallthrough */ | |
606 | case 6: h ^= (U64TYPE)(data2[5]) << 40; /* fallthrough */ | |
607 | case 5: h ^= (U64TYPE)(data2[4]) << 32; /* fallthrough */ | |
608 | case 4: h ^= (U64TYPE)(data2[3]) << 24; /* fallthrough */ | |
609 | case 3: h ^= (U64TYPE)(data2[2]) << 16; /* fallthrough */ | |
610 | case 2: h ^= (U64TYPE)(data2[1]) << 8; /* fallthrough */ | |
611 | case 1: h ^= (U64TYPE)(data2[0]); /* fallthrough */ | |
612 | h *= m; | |
613 | }; | |
614 | ||
615 | h ^= h >> r; | |
616 | h *= m; | |
617 | h ^= h >> r; | |
618 | ||
619 | /* was: return h; */ | |
620 | return h & 0xFFFFFFFF; | |
621 | } | |
622 | ||
623 | #endif | |
624 | ||
625 | #ifdef PERL_HASH_FUNC_MURMUR_HASH_64B | |
626 | /* This code is from Austin Appleby and is in the public domain. | |
627 | Altered by Yves Orton to match Perl's hash interface and return | |
628 | a 32 bit value | |
629 | ||
630 | Note uses unaligned 32 bit loads - will NOT work on machines with | |
631 | strict alginment requirements. | |
632 | ||
633 | Also this code may not be suitable for big-endian machines. | |
634 | */ | |
635 | ||
636 | /* a 64-bit hash for 32-bit platforms where we only use the low 32 bits */ | |
637 | PERL_STATIC_INLINE U32 | |
638 | S_perl_hash_murmur_hash_64b (const unsigned char * const seed, const unsigned char *str, STRLEN len) | |
639 | { | |
640 | const U32 m = 0x5bd1e995; | |
641 | const int r = 24; | |
642 | ||
643 | U32 h1 = ((U32 *)seed)[0] ^ len; | |
644 | U32 h2 = ((U32 *)seed)[1]; | |
645 | ||
646 | const U32 * data = (const U32 *)str; | |
647 | ||
648 | while(len >= 8) | |
649 | { | |
650 | U32 k1, k2; | |
651 | k1 = *data++; | |
652 | k1 *= m; k1 ^= k1 >> r; k1 *= m; | |
653 | h1 *= m; h1 ^= k1; | |
654 | len -= 4; | |
655 | ||
656 | k2 = *data++; | |
657 | k2 *= m; k2 ^= k2 >> r; k2 *= m; | |
658 | h2 *= m; h2 ^= k2; | |
659 | len -= 4; | |
660 | } | |
661 | ||
662 | if(len >= 4) | |
663 | { | |
664 | U32 k1 = *data++; | |
665 | k1 *= m; k1 ^= k1 >> r; k1 *= m; | |
666 | h1 *= m; h1 ^= k1; | |
667 | len -= 4; | |
668 | } | |
669 | ||
670 | switch(len) | |
671 | { | |
672 | case 3: h2 ^= ((unsigned char*)data)[2] << 16; /* fallthrough */ | |
673 | case 2: h2 ^= ((unsigned char*)data)[1] << 8; /* fallthrough */ | |
674 | case 1: h2 ^= ((unsigned char*)data)[0]; /* fallthrough */ | |
675 | h2 *= m; | |
676 | }; | |
677 | ||
678 | h1 ^= h2 >> 18; h1 *= m; | |
679 | h2 ^= h1 >> 22; h2 *= m; | |
680 | /* | |
681 | The following code has been removed as it is unused | |
682 | when only the low 32 bits are used. -- Yves | |
683 | ||
684 | h1 ^= h2 >> 17; h1 *= m; | |
685 | ||
686 | U64TYPE h = h1; | |
687 | ||
688 | h = (h << 32) | h2; | |
689 | */ | |
690 | ||
691 | return h2; | |
692 | } | |
693 | #endif | |
694 | ||
4d3a042d YO |
695 | /* legacy - only mod_perl should be doing this. */ |
696 | #ifdef PERL_HASH_INTERNAL_ACCESS | |
697 | #define PERL_HASH_INTERNAL(hash,str,len) PERL_HASH(hash,str,len) | |
698 | #endif | |
699 | ||
700 | #endif /*compile once*/ | |
701 | ||
702 | /* | |
703 | * Local variables: | |
704 | * c-indentation-style: bsd | |
705 | * c-basic-offset: 4 | |
706 | * indent-tabs-mode: nil | |
707 | * End: | |
708 | * | |
709 | * ex: set ts=8 sts=4 sw=4 et: | |
710 | */ |