19 #ifndef _XDELTA3_HASH_H_ 20 #define _XDELTA3_HASH_H_ 23 #define SMALL_HASH_DEBUG1(s,inp) \ 24 usize_t debug_state; \ 25 usize_t debug_hval = xd3_checksum_hash (& (s)->small_hash, \ 26 xd3_scksum (&debug_state, (inp), (s)->smatcher.small_look)) 27 #define SMALL_HASH_DEBUG2(s,inp) \ 28 XD3_ASSERT (debug_hval == xd3_checksum_hash (& (s)->small_hash, \ 29 xd3_scksum (&debug_state, (inp), (s)->smatcher.small_look))) 31 #define SMALL_HASH_DEBUG1(s,inp) 32 #define SMALL_HASH_DEBUG2(s,inp) 45 #define PERMUTE(x) (x) 47 #define PERMUTE(x) (__single_hash[(uint32_t)x]) 49 static const uint16_t __single_hash[256] =
53 0xbcd1, 0xbb65, 0x42c2, 0xdffe, 0x9666, 0x431b, 0x8504, 0xeb46,
54 0x6379, 0xd460, 0xcf14, 0x53cf, 0xdb51, 0xdb08, 0x12c8, 0xf602,
55 0xe766, 0x2394, 0x250d, 0xdcbb, 0xa678, 0x02af, 0xa5c6, 0x7ea6,
56 0xb645, 0xcb4d, 0xc44b, 0xe5dc, 0x9fe6, 0x5b5c, 0x35f5, 0x701a,
57 0x220f, 0x6c38, 0x1a56, 0x4ca3, 0xffc6, 0xb152, 0x8d61, 0x7a58,
58 0x9025, 0x8b3d, 0xbf0f, 0x95a3, 0xe5f4, 0xc127, 0x3bed, 0x320b,
59 0xb7f3, 0x6054, 0x333c, 0xd383, 0x8154, 0x5242, 0x4e0d, 0x0a94,
60 0x7028, 0x8689, 0x3a22, 0x0980, 0x1847, 0xb0f1, 0x9b5c, 0x4176,
61 0xb858, 0xd542, 0x1f6c, 0x2497, 0x6a5a, 0x9fa9, 0x8c5a, 0x7743,
62 0xa8a9, 0x9a02, 0x4918, 0x438c, 0xc388, 0x9e2b, 0x4cad, 0x01b6,
63 0xab19, 0xf777, 0x365f, 0x1eb2, 0x091e, 0x7bf8, 0x7a8e, 0x5227,
64 0xeab1, 0x2074, 0x4523, 0xe781, 0x01a3, 0x163d, 0x3b2e, 0x287d,
65 0x5e7f, 0xa063, 0xb134, 0x8fae, 0x5e8e, 0xb7b7, 0x4548, 0x1f5a,
66 0xfa56, 0x7a24, 0x900f, 0x42dc, 0xcc69, 0x02a0, 0x0b22, 0xdb31,
67 0x71fe, 0x0c7d, 0x1732, 0x1159, 0xcb09, 0xe1d2, 0x1351, 0x52e9,
68 0xf536, 0x5a4f, 0xc316, 0x6bf9, 0x8994, 0xb774, 0x5f3e, 0xf6d6,
69 0x3a61, 0xf82c, 0xcc22, 0x9d06, 0x299c, 0x09e5, 0x1eec, 0x514f,
70 0x8d53, 0xa650, 0x5c6e, 0xc577, 0x7958, 0x71ac, 0x8916, 0x9b4f,
71 0x2c09, 0x5211, 0xf6d8, 0xcaaa, 0xf7ef, 0x287f, 0x7a94, 0xab49,
72 0xfa2c, 0x7222, 0xe457, 0xd71a, 0x00c3, 0x1a76, 0xe98c, 0xc037,
73 0x8208, 0x5c2d, 0xdfda, 0xe5f5, 0x0b45, 0x15ce, 0x8a7e, 0xfcad,
74 0xaa2d, 0x4b5c, 0xd42e, 0xb251, 0x907e, 0x9a47, 0xc9a6, 0xd93f,
75 0x085e, 0x35ce, 0xa153, 0x7e7b, 0x9f0b, 0x25aa, 0x5d9f, 0xc04d,
76 0x8a0e, 0x2875, 0x4a1c, 0x295f, 0x1393, 0xf760, 0x9178, 0x0f5b,
77 0xfa7d, 0x83b4, 0x2082, 0x721d, 0x6462, 0x0368, 0x67e2, 0x8624,
78 0x194d, 0x22f6, 0x78fb, 0x6791, 0xb238, 0xb332, 0x7276, 0xf272,
79 0x47ec, 0x4504, 0xa961, 0x9fc8, 0x3fdc, 0xb413, 0x007a, 0x0806,
80 0x7458, 0x95c6, 0xccaa, 0x18d6, 0xe2ae, 0x1b06, 0xf3f6, 0x5050,
81 0xc8e8, 0xf4ac, 0xc04c, 0xf41c, 0x992f, 0xae44, 0x5f1b, 0x1113,
82 0x1738, 0xd9a8, 0x19ea, 0x2d33, 0x9698, 0x2fe9, 0x323f, 0xcde2,
83 0x6d71, 0xe37d, 0xb697, 0x2c4f, 0x4373, 0x9102, 0x075d, 0x8e25,
84 0x1672, 0xec28, 0x6acb, 0x86cc, 0x186e, 0x9414, 0xd674, 0xd1a5
91 xd3_large_cksum_update (uint32_t cksum,
94 uint32_t old_c =
PERMUTE(base[0]);
95 uint32_t new_c =
PERMUTE(base[look]);
96 uint32_t low = ((cksum & 0xffff) - old_c + new_c) & 0xffff;
97 uint32_t high = ((cksum >> 16) - (old_c * look) + low) & 0xffff;
98 return (high << 16) | low;
106 static inline uint32_t
111 (*state) = *(uint32_t*)base;
114 static inline uint32_t
119 (*state) = *(uint32_t*)(base+1);
123 static inline uint32_t
128 (*state) = (base[0] << 24 |
134 static inline uint32_t
152 return (cksum >> cfg->
shift) ^ (cksum & cfg->
mask);
159 #if ADLER_LARGE_CKSUM 160 static inline uint32_t
167 for (; i < ln; i += 1)
173 return ((high & 0xffff) << 16) | (low & 0xffff);
176 static inline uint32_t
181 for (i = 0, j = ln - 1; i < ln; ++i, --j) {
182 h +=
PERMUTE(seg[i]) * hash_multiplier_powers[j];
195 for (i = 3; i <= bits; i += 1)
197 if (slots < (1U << i))
214 int bits = xd3_size_log2 (slots);
217 cfg->
size = (1 << bits);
219 cfg->
shift = 32 - bits;
static uint32_t xd3_lcksum(const uint8_t *seg, const usize_t ln)
static usize_t xd3_checksum_hash(const xd3_hash_cfg *cfg, const usize_t cksum)
static uint32_t xd3_scksum(uint32_t *state, const uint8_t *base, const usize_t look)
static const uint32_t hash_multiplier
static uint32_t xd3_small_cksum_update(uint32_t *state, const uint8_t *base, const usize_t look)