[perl5.git] / zaphod32_hash.h

#ifndef DEBUG_ZAPHOD32_HASH
#define DEBUG_ZAPHOD32_HASH 0

#if DEBUG_ZAPHOD32_HASH == 1
#include <stdio.h>
#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5)    printf(pat, v0, v1, v2, v3, v4, v5)
#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4)       printf(pat, v0, v1, v2, v3, v4)
#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3)          printf(pat, v0, v1, v2, v3)
#define ZAPHOD32_WARN3(pat,v0,v1,v2)             printf(pat, v0, v1, v2)
#define ZAPHOD32_WARN2(pat,v0,v1)                printf(pat, v0, v1)
#define NOTE3(pat,v0,v1,v2)             printf(pat, v0, v1, v2)
#elif DEBUG_ZAPHOD32_HASH == 2
#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5)
#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4)
#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3)
#define ZAPHOD32_WARN3(pat,v0,v1,v2)
#define ZAPHOD32_WARN2(pat,v0,v1)
#define NOTE3(pat,v0,v1,v2)             printf(pat, v0, v1, v2)
#else
#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5)
#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4)
#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3)
#define ZAPHOD32_WARN3(pat,v0,v1,v2)
#define NOTE3(pat,v0,v1,v2)
#define ZAPHOD32_WARN2(pat,v0,v1)
#endif

#ifndef ROTL32
#define _ROTL_SIZED(x,r,s) ( ((x) << (r)) | ((x) >> ((s) - (r))) )
#define _ROTR_SIZED(x,r,s) ( ((x) << ((s) - (r))) | ((x) >> (r)) )
#define ROTL32(x,r) _ROTL_SIZED(x,r,32)
#define ROTR32(x,r) _ROTR_SIZED(x,r,32)
#endif

#ifndef PERL_SEEN_HV_FUNC_H
#if !defined(U64)
    #include <stdint.h>
    #define U64 uint64_t
#endif

#if !defined(U32)
  #define U32 uint32_t
#endif

#if !defined(U8)
    #define U8 unsigned char
#endif

#if !defined(U16)
    #define U16 uint16_t
#endif

#ifndef STRLEN
#define STRLEN int
#endif
#endif

#ifndef ZAPHOD32_STATIC_INLINE
#ifdef PERL_STATIC_INLINE
#define ZAPHOD32_STATIC_INLINE PERL_STATIC_INLINE
#else
#define ZAPHOD32_STATIC_INLINE static inline
#endif
#endif

#ifndef STMT_START
#define STMT_START do
#define STMT_END while(0)
#endif

#ifndef U8TO64_LE
#define U8TO64_LE(ptr)  (*((const U64 *)(ptr)))
#endif
#ifndef U8TO32_LE
#define U8TO32_LE(ptr)  (*((const U32 *)(ptr)))
#endif
#ifndef U8TO16_LE
#define U8TO16_LE(ptr)  (*((const U16 *)(ptr)))
#endif

/* This is two marsaglia xor-shift permutes, with a prime-multiple
 * sandwiched inside. The end result of doing this twice with different
 * primes is a completely avalanched v.  */
#define ZAPHOD32_SCRAMBLE32(v,prime) STMT_START {  \
    v ^= (v>>9);                        \
    v ^= (v<<21);                       \
    v ^= (v>>16);                       \
    v *= prime;                         \
    v ^= (v>>17);                       \
    v ^= (v<<15);                       \
    v ^= (v>>23);                       \
} STMT_END

#define ZAPHOD32_FINALIZE(v0,v1,v2) STMT_START {          \
    ZAPHOD32_WARN3("v0=%08x v1=%08x v2=%08x - ZAPHOD32 FINALIZE\n", \
            (unsigned int)v0, (unsigned int)v1, (unsigned int)v2);  \
    v2 += v0;                       \
    v1 -= v2;                       \
    v1 = ROTL32(v1,  6);           \
    v2 ^= v1;                       \
    v2 = ROTL32(v2, 28);           \
    v1 ^= v2;                       \
    v0 += v1;                       \
    v1 = ROTL32(v1, 24);           \
    v2 += v1;                       \
    v2 = ROTL32(v2, 18) + v1;      \
    v0 ^= v2;                       \
    v0 = ROTL32(v0, 20);           \
    v2 += v0;                       \
    v1 ^= v2;                       \
    v0 += v1;                       \
    v0 = ROTL32(v0,  5);           \
    v2 += v0;                       \
    v2 = ROTL32(v2, 22);           \
    v0 -= v1;                       \
    v1 -= v2;                       \
    v1 = ROTL32(v1, 17);           \
} STMT_END

#define ZAPHOD32_MIX(v0,v1,v2,text) STMT_START {                              \
    ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x - ZAPHOD32 %s MIX\n",                   \
            (unsigned int)v0,(unsigned int)v1,(unsigned int)v2, text );  \
    v0 = ROTL32(v0,16) - v2;   \
    v1 = ROTR32(v1,13) ^ v2;   \
    v2 = ROTL32(v2,17) + v1;   \
    v0 = ROTR32(v0, 2) + v1;   \
    v1 = ROTR32(v1,17) - v0;   \
    v2 = ROTR32(v2, 7) ^ v0;   \
} STMT_END


ZAPHOD32_STATIC_INLINE
void zaphod32_seed_state (
    const U8 *seed_ch,
    U8 *state_ch
) {
    U32 *seed= (U32 *)seed_ch;
    U32 *state= (U32 *)state_ch;
  
    /* hex expansion of pi, skipping first two digits. pi= 3.2[43f6...]*/
    /* pi value in hex from here:
     * http://turner.faculty.swau.edu/mathematics/materialslibrary/pi/pibases.html*/
    /* Ensure that the three state vectors are nonzero regardless of the seed. */
    /* The idea of these two steps is to ensure that the 0 state comes from a seed
     * utterly unlike that of the value we replace it with.*/
    state[0]= seed[0] ^ 0x43f6a888;
    state[1]= seed[1] ^ 0x5a308d31;
    state[2]= seed[2] ^ 0x3198a2e0;
    if (!state[0]) state[0] = 1;
    if (!state[1]) state[1] = 2;
    if (!state[2]) state[2] = 4;
    /* these are pseduo-randomly selected primes between 2**31 and 2**32
     * (I generated a big list and then randomly chose some from the list) */
    ZAPHOD32_SCRAMBLE32(state[0],0x9fade23b);
    ZAPHOD32_SCRAMBLE32(state[1],0xaa6f908d);
    ZAPHOD32_SCRAMBLE32(state[2],0xcdf6b72d);
    /* now that we have scrambled we do some mixing to avalanche the
     * state bits to gether */
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 1/4");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 2/4");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 3/4");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 4/4");

    /* and then scramble them again with different primes */
    ZAPHOD32_SCRAMBLE32(state[0],0xc95d22a9);
    ZAPHOD32_SCRAMBLE32(state[1],0x8497242b);
    ZAPHOD32_SCRAMBLE32(state[2],0x9c5cc4e9);
    /* and one final mix */
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
    ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");

}

ZAPHOD32_STATIC_INLINE
U32 zaphod32_hash_with_state(
    const U8 *state_ch,
    const U8 *key,
    const STRLEN key_len
) {
    U32 *state= (U32 *)state_ch;
    const U8 *end;
    U32 len = key_len; 
    U32 v0= state[0];
    U32 v1= state[1];
    U32 v2= state[2] ^ (0xC41A7AB1 * (key_len + 1));

    ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x ln=%08x HASH START\n",
            (unsigned int)state[0], (unsigned int)state[1],
            (unsigned int)state[2], (unsigned int)key_len);
    {
        switch (len) {
            default: goto zaphod32_read8;
            case 12: v2 += (U32)key[11] << 24;
            case 11: v2 += (U32)key[10] << 16;
            case 10: v2 += (U32)U8TO16_LE(key+8);
                     v1 -= U8TO32_LE(key+4);
                     v0 += U8TO32_LE(key+0);
                     goto zaphod32_finalize;
            case 9: v2 += (U32)key[8];
            case 8: v1 -= U8TO32_LE(key+4);
                    v0 += U8TO32_LE(key+0);
                    goto zaphod32_finalize;
            case 7: v2 += (U32)key[6];
            case 6: v0 += (U32)U8TO16_LE(key+4);
                    v1 -= U8TO32_LE(key+0);
                    goto zaphod32_finalize;
            case 5: v0 += (U32)key[4];
            case 4: v1 -= U8TO32_LE(key+0);
                    goto zaphod32_finalize;
            case 3: v2 += (U32)key[2];
            case 2: v0 += (U32)U8TO16_LE(key);
                    break;
            case 1: v0 += (U32)key[0];
                    break;
            case 0: v2 ^= 0xFF;
                    break;

        }
        v0 -= v2;
        v2 = ROTL32(v2, 8) ^ v0;
        v0 = ROTR32(v0,16) + v2;
        v2 += v0;
        v0 += v0 >> 9;
        v0 += v2;
        v2 ^= v0;
        v2 += v2 << 4;
        v0 -= v2;
        v2 = ROTR32(v2, 8) ^ v0;
        v0 = ROTL32(v0,16) ^ v2;
        v2 = ROTL32(v2,10) + v0;
        v0 = ROTR32(v0,30) + v2;
        v2 = ROTR32(v2,12);
        return v0 ^ v2;
    }

    if (len >= 8) {
zaphod32_read8:
        len = key_len & 0x7;
        end = key + key_len - len;
        do {
            v1 -= U8TO32_LE(key+0);
            v0 += U8TO32_LE(key+4);
            ZAPHOD32_MIX(v0,v1,v2,"MIX 2-WORDS A");
            key += 8;
        } while ( key < end );
    }

    if ( len >= 4 ) {
        v1 -= U8TO32_LE(key);
        key += 4;
    }

    v0 += (U32)(key_len) << 24;
    switch (len & 0x3) {
        case 3: v2 += (U32)key[2];
        case 2: v0 += (U32)U8TO16_LE(key);
                break;
        case 1: v0 += (U32)key[0];
                break;
        case 0: v2 ^= 0xFF;
    }
zaphod32_finalize:
    ZAPHOD32_FINALIZE(v0,v1,v2);

    ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x hh=%08x - FINAL\n\n",
            (unsigned int)v0, (unsigned int)v1, (unsigned int)v2,
            (unsigned int)v0 ^ v1 ^ v2);

    return v0 ^ v1 ^ v2;
}

ZAPHOD32_STATIC_INLINE U32 zaphod32_hash(
    const U8 *seed_ch,
    const U8 *key,
    const STRLEN key_len
) {
    U32 state[1796];
    zaphod32_seed_state(seed_ch,(U8*)state);
    return zaphod32_hash_with_state((U8*)state,key,key_len);
}

#endif
Commit	Line	Data
9d5e3f1a YO	1	#ifndef DEBUG_ZAPHOD32_HASH
	2	#define DEBUG_ZAPHOD32_HASH 0
	3
	4	#if DEBUG_ZAPHOD32_HASH == 1
	5	#include <stdio.h>
	6	#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5) printf(pat, v0, v1, v2, v3, v4, v5)
	7	#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4) printf(pat, v0, v1, v2, v3, v4)
	8	#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3) printf(pat, v0, v1, v2, v3)
	9	#define ZAPHOD32_WARN3(pat,v0,v1,v2) printf(pat, v0, v1, v2)
	10	#define ZAPHOD32_WARN2(pat,v0,v1) printf(pat, v0, v1)
	11	#define NOTE3(pat,v0,v1,v2) printf(pat, v0, v1, v2)
	12	#elif DEBUG_ZAPHOD32_HASH == 2
	13	#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5)
	14	#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4)
	15	#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3)
	16	#define ZAPHOD32_WARN3(pat,v0,v1,v2)
	17	#define ZAPHOD32_WARN2(pat,v0,v1)
	18	#define NOTE3(pat,v0,v1,v2) printf(pat, v0, v1, v2)
	19	#else
	20	#define ZAPHOD32_WARN6(pat,v0,v1,v2,v3,v4,v5)
	21	#define ZAPHOD32_WARN5(pat,v0,v1,v2,v3,v4)
	22	#define ZAPHOD32_WARN4(pat,v0,v1,v2,v3)
	23	#define ZAPHOD32_WARN3(pat,v0,v1,v2)
	24	#define NOTE3(pat,v0,v1,v2)
	25	#define ZAPHOD32_WARN2(pat,v0,v1)
	26	#endif
	27
	28	#ifndef ROTL32
	29	#define _ROTL_SIZED(x,r,s) ( ((x) << (r)) \| ((x) >> ((s) - (r))) )
	30	#define _ROTR_SIZED(x,r,s) ( ((x) << ((s) - (r))) \| ((x) >> (r)) )
	31	#define ROTL32(x,r) _ROTL_SIZED(x,r,32)
	32	#define ROTR32(x,r) _ROTR_SIZED(x,r,32)
	33	#endif
	34
	35	#ifndef PERL_SEEN_HV_FUNC_H
	36	#if !defined(U64)
	37	#include <stdint.h>
	38	#define U64 uint64_t
	39	#endif
	40
	41	#if !defined(U32)
	42	#define U32 uint32_t
	43	#endif
	44
	45	#if !defined(U8)
	46	#define U8 unsigned char
	47	#endif
	48
	49	#if !defined(U16)
	50	#define U16 uint16_t
	51	#endif
	52
	53	#ifndef STRLEN
	54	#define STRLEN int
	55	#endif
	56	#endif
	57
	58	#ifndef ZAPHOD32_STATIC_INLINE
	59	#ifdef PERL_STATIC_INLINE
	60	#define ZAPHOD32_STATIC_INLINE PERL_STATIC_INLINE
	61	#else
	62	#define ZAPHOD32_STATIC_INLINE static inline
	63	#endif
	64	#endif
65
66	#ifndef STMT_START
67	#define STMT_START do
68	#define STMT_END while(0)
69	#endif
70
71	#ifndef U8TO64_LE
72	#define U8TO64_LE(ptr) (((const U64 )(ptr)))
73	#endif
74	#ifndef U8TO32_LE
75	#define U8TO32_LE(ptr) (((const U32 )(ptr)))
76	#endif
77	#ifndef U8TO16_LE
78	#define U8TO16_LE(ptr) (((const U16 )(ptr)))
79	#endif
80
81	/* This is two marsaglia xor-shift permutes, with a prime-multiple
82	* sandwiched inside. The end result of doing this twice with different
83	* primes is a completely avalanched v. */
84	#define ZAPHOD32_SCRAMBLE32(v,prime) STMT_START { \
85	v ^= (v>>9); \
86	v ^= (v<<21); \
87	v ^= (v>>16); \
88	v *= prime; \
89	v ^= (v>>17); \
90	v ^= (v<<15); \
91	v ^= (v>>23); \
92	} STMT_END
93
94	#define ZAPHOD32_FINALIZE(v0,v1,v2) STMT_START { \
95	ZAPHOD32_WARN3("v0=%08x v1=%08x v2=%08x - ZAPHOD32 FINALIZE\n", \
96	(unsigned int)v0, (unsigned int)v1, (unsigned int)v2); \
97	v2 += v0; \
98	v1 -= v2; \
99	v1 = ROTL32(v1, 6); \
100	v2 ^= v1; \
101	v2 = ROTL32(v2, 28); \
102	v1 ^= v2; \
103	v0 += v1; \
104	v1 = ROTL32(v1, 24); \
105	v2 += v1; \
106	v2 = ROTL32(v2, 18) + v1; \
107	v0 ^= v2; \
108	v0 = ROTL32(v0, 20); \
109	v2 += v0; \
110	v1 ^= v2; \
111	v0 += v1; \
112	v0 = ROTL32(v0, 5); \
113	v2 += v0; \
114	v2 = ROTL32(v2, 22); \
115	v0 -= v1; \
116	v1 -= v2; \
117	v1 = ROTL32(v1, 17); \
118	} STMT_END
119
120	#define ZAPHOD32_MIX(v0,v1,v2,text) STMT_START { \
121	ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x - ZAPHOD32 %s MIX\n", \
122	(unsigned int)v0,(unsigned int)v1,(unsigned int)v2, text ); \
123	v0 = ROTL32(v0,16) - v2; \
124	v1 = ROTR32(v1,13) ^ v2; \
125	v2 = ROTL32(v2,17) + v1; \
126	v0 = ROTR32(v0, 2) + v1; \
127	v1 = ROTR32(v1,17) - v0; \
128	v2 = ROTR32(v2, 7) ^ v0; \
129	} STMT_END
130
131
132	ZAPHOD32_STATIC_INLINE
133	void zaphod32_seed_state (
134	const U8 *seed_ch,
135	U8 *state_ch
136	) {
137	U32 seed= (U32 )seed_ch;
138	U32 state= (U32 )state_ch;
139
140	/* hex expansion of pi, skipping first two digits. pi= 3.2[43f6...]*/
141	/* pi value in hex from here:
142	* http://turner.faculty.swau.edu/mathematics/materialslibrary/pi/pibases.html*/
143	/* Ensure that the three state vectors are nonzero regardless of the seed. */
144	/* The idea of these two steps is to ensure that the 0 state comes from a seed
145	* utterly unlike that of the value we replace it with.*/
146	state[0]= seed[0] ^ 0x43f6a888;
147	state[1]= seed[1] ^ 0x5a308d31;
148	state[2]= seed[2] ^ 0x3198a2e0;
149	if (!state[0]) state[0] = 1;
150	if (!state[1]) state[1] = 2;
151	if (!state[2]) state[2] = 4;
152	/* these are pseduo-randomly selected primes between 231 and 232
153	* (I generated a big list and then randomly chose some from the list) */
154	ZAPHOD32_SCRAMBLE32(state[0],0x9fade23b);
155	ZAPHOD32_SCRAMBLE32(state[1],0xaa6f908d);
156	ZAPHOD32_SCRAMBLE32(state[2],0xcdf6b72d);
157	/* now that we have scrambled we do some mixing to avalanche the
158	* state bits to gether */
159	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 1/4");
160	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 2/4");
161	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 3/4");
162	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE A 4/4");
163
164	/* and then scramble them again with different primes */
165	ZAPHOD32_SCRAMBLE32(state[0],0xc95d22a9);
166	ZAPHOD32_SCRAMBLE32(state[1],0x8497242b);
167	ZAPHOD32_SCRAMBLE32(state[2],0x9c5cc4e9);
168	/* and one final mix */
169	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
170	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
171	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
172	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
173	ZAPHOD32_MIX(state[0],state[1],state[2],"ZAPHOD32 SEED-STATE 3/3");
174
9d5e3f1a YO	175	}
	176
	177	ZAPHOD32_STATIC_INLINE
	178	U32 zaphod32_hash_with_state(
	179	const U8 *state_ch,
	180	const U8 *key,
	181	const STRLEN key_len
	182	) {
	183	U32 state= (U32 )state_ch;
	184	const U8 *end;
	185	U32 len = key_len;
	186	U32 v0= state[0];
	187	U32 v1= state[1];
	188	U32 v2= state[2] ^ (0xC41A7AB1 * (key_len + 1));
	189
	190	ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x ln=%08x HASH START\n",
	191	(unsigned int)state[0], (unsigned int)state[1],
	192	(unsigned int)state[2], (unsigned int)key_len);
	193	{
	194	switch (len) {
	195	default: goto zaphod32_read8;
	196	case 12: v2 += (U32)key[11] << 24;
	197	case 11: v2 += (U32)key[10] << 16;
	198	case 10: v2 += (U32)U8TO16_LE(key+8);
	199	v1 -= U8TO32_LE(key+4);
	200	v0 += U8TO32_LE(key+0);
	201	goto zaphod32_finalize;
	202	case 9: v2 += (U32)key[8];
	203	case 8: v1 -= U8TO32_LE(key+4);
	204	v0 += U8TO32_LE(key+0);
	205	goto zaphod32_finalize;
	206	case 7: v2 += (U32)key[6];
	207	case 6: v0 += (U32)U8TO16_LE(key+4);
	208	v1 -= U8TO32_LE(key+0);
	209	goto zaphod32_finalize;
	210	case 5: v0 += (U32)key[4];
	211	case 4: v1 -= U8TO32_LE(key+0);
	212	goto zaphod32_finalize;
	213	case 3: v2 += (U32)key[2];
	214	case 2: v0 += (U32)U8TO16_LE(key);
	215	break;
	216	case 1: v0 += (U32)key[0];
	217	break;
	218	case 0: v2 ^= 0xFF;
	219	break;
	220
	221	}
	222	v0 -= v2;
	223	v2 = ROTL32(v2, 8) ^ v0;
	224	v0 = ROTR32(v0,16) + v2;
	225	v2 += v0;
	226	v0 += v0 >> 9;
	227	v0 += v2;
	228	v2 ^= v0;
	229	v2 += v2 << 4;
	230	v0 -= v2;
	231	v2 = ROTR32(v2, 8) ^ v0;
	232	v0 = ROTL32(v0,16) ^ v2;
	233	v2 = ROTL32(v2,10) + v0;
	234	v0 = ROTR32(v0,30) + v2;
	235	v2 = ROTR32(v2,12);
	236	return v0 ^ v2;
	237	}
	238
239	if (len >= 8) {
240	zaphod32_read8:
241	len = key_len & 0x7;
242	end = key + key_len - len;
243	do {
244	v1 -= U8TO32_LE(key+0);
245	v0 += U8TO32_LE(key+4);
246	ZAPHOD32_MIX(v0,v1,v2,"MIX 2-WORDS A");
247	key += 8;
248	} while ( key < end );
249	}
250
251	if ( len >= 4 ) {
252	v1 -= U8TO32_LE(key);
253	key += 4;
254	}
255
256	v0 += (U32)(key_len) << 24;
257	switch (len & 0x3) {
258	case 3: v2 += (U32)key[2];
259	case 2: v0 += (U32)U8TO16_LE(key);
260	break;
261	case 1: v0 += (U32)key[0];
262	break;
263	case 0: v2 ^= 0xFF;
264	}
265	zaphod32_finalize:
266	ZAPHOD32_FINALIZE(v0,v1,v2);
267
268	ZAPHOD32_WARN4("v0=%08x v1=%08x v2=%08x hh=%08x - FINAL\n\n",
269	(unsigned int)v0, (unsigned int)v1, (unsigned int)v2,
270	(unsigned int)v0 ^ v1 ^ v2);
271
272	return v0 ^ v1 ^ v2;
273	}
274
275	ZAPHOD32_STATIC_INLINE U32 zaphod32_hash(
276	const U8 *seed_ch,
277	const U8 *key,
278	const STRLEN key_len
279	) {
280	U32 state[1796];
281	zaphod32_seed_state(seed_ch,(U8*)state);
282	return zaphod32_hash_with_state((U8*)state,key,key_len);
283	}
284
285	#endif