private static void XXH64_reset(XXH64_state *state, ulong seed)
{
XXH_zero(state, sizeof(XXH64_state));
state->v1 = seed + PRIME64_1 + PRIME64_2;
state->v2 = seed + PRIME64_2;
state->v3 = seed + 0;
state->v4 = seed - PRIME64_1;
}
private static void XXH64_update(XXH64_state *state, void *input, int len)
{
var p = (byte *)input;
var bEnd = p + len;
state->total_len += (ulong)len;
if (state->memsize + len < 32)
{
/* fill in tmp buffer */
XXH_copy((byte *)state->mem64 + state->memsize, input, len);
state->memsize += (uint)len;
return;
}
if (state->memsize > 0)
{
/* tmp buffer is full */
XXH_copy((byte *)state->mem64 + state->memsize, input, (int)(32 - state->memsize));
state->v1 = XXH64_round(state->v1, XXH_read64(state->mem64 + 0));
state->v2 = XXH64_round(state->v2, XXH_read64(state->mem64 + 1));
state->v3 = XXH64_round(state->v3, XXH_read64(state->mem64 + 2));
state->v4 = XXH64_round(state->v4, XXH_read64(state->mem64 + 3));
p += 32 - state->memsize;
state->memsize = 0;
}
if (p + 32 <= bEnd)
{
var limit = bEnd - 32;
var v1 = state->v1;
var v2 = state->v2;
var v3 = state->v3;
var v4 = state->v4;
do
{
v1 = XXH64_round(v1, XXH_read64(p + 0));
v2 = XXH64_round(v2, XXH_read64(p + 8));
v3 = XXH64_round(v3, XXH_read64(p + 16));
v4 = XXH64_round(v4, XXH_read64(p + 24));
p += 32;
}while (p <= limit);
state->v1 = v1;
state->v2 = v2;
state->v3 = v3;
state->v4 = v4;
}
if (p < bEnd)
{
XXH_copy(state->mem64, p, (int)(bEnd - p));
state->memsize = (uint)(bEnd - p);
}
}
private static ulong XXH64_digest(XXH64_state *state)
{
var p = (byte *)state->mem64;
var bEnd = (byte *)state->mem64 + state->memsize;
ulong h64;
if (state->total_len >= 32)
{
var v1 = state->v1;
var v2 = state->v2;
var v3 = state->v3;
var v4 = state->v4;
h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);
h64 = XXH64_mergeRound(h64, v1);
h64 = XXH64_mergeRound(h64, v2);
h64 = XXH64_mergeRound(h64, v3);
h64 = XXH64_mergeRound(h64, v4);
}
else
{
h64 = state->v3 + PRIME64_5;
}
h64 += (ulong)state->total_len;
while (p + 8 <= bEnd)
{
h64 ^= XXH64_round(0, XXH_read64(p));
h64 = (XXH_rotl64(h64, 27) * PRIME64_1) + PRIME64_4;
p += 8;
}
if (p + 4 <= bEnd)
{
h64 ^= XXH_read32(p) * PRIME64_1;
h64 = (XXH_rotl64(h64, 23) * PRIME64_2) + PRIME64_3;
p += 4;
}
while (p < bEnd)
{
h64 ^= *p * PRIME64_5;
h64 = XXH_rotl64(h64, 11) * PRIME64_1;
p++;
}
h64 ^= h64 >> 33;
h64 *= PRIME64_2;
h64 ^= h64 >> 29;
h64 *= PRIME64_3;
h64 ^= h64 >> 32;
return(h64);
}
