static internal ulong InternalDigestState64(State64 state)
{
InputTextStream p = new InputTextStream(state.mem64);
long bEnd = state.memsize;
ulong h64;
if (state.total_len >= 32)
{
ulong v1 = state.v1;
ulong v2 = state.v2;
ulong v3 = state.v3;
ulong 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 += state.total_len;
while (p.Position + 8 <= bEnd)
{
ulong k1 = XXH64_round(0, p.ReadUInt64());
h64 ^= k1;
h64 = XXH_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
}
if (p.Position + 4 <= bEnd)
{
h64 ^= (ulong)(p.ReadUInt32()) * PRIME64_1;
h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
}
while (p.Position < bEnd)
{
h64 ^= p.ReadByte() * PRIME64_5;
h64 = XXH_rotl64(h64, 11) * PRIME64_1;
}
h64 ^= h64 >> 33;
h64 *= PRIME64_2;
h64 ^= h64 >> 29;
h64 *= PRIME64_3;
h64 ^= h64 >> 32;
return(h64);
}
static public ulong XXH64(byte[] input, int offset, int length, ulong seed)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (input.Rank != 1)
{
ThrowArrayMultiRank("input");
}
if (input.GetLowerBound(0) != 0)
{
ThrowArrayNonZeroLowerBound("input");
}
if (offset < 0)
{
ThrowArgumentNonNegativeNumber("offset");
}
if (length < 0)
{
ThrowArgumentNonNegativeNumber("length");
}
if (input.Length < (offset + length))
{
ThrowArrayInvalidOffsetAndLength();
}
#if EnableSimpleVersion
/* Simple version, good for code maintenance, but unfortunately slow for small inputs */
State64 state = new State64();
ResetState64(state, seed);
UpdateState64(state, input, offset, length);
return(DigestState64(state));
#else
InputTextStream p = new InputTextStream(input, offset);
long bEnd = p.Position + length;
ulong h64;
if (length >= 32)
{
long limit = bEnd - 32;
ulong v1 = seed + PRIME64_1 + PRIME64_2;
ulong v2 = seed + PRIME64_2;
ulong v3 = seed + 0;
ulong v4 = seed - PRIME64_1;
do
{
v1 += p.ReadUInt64() * PRIME64_2;
v1 = XXH_rotl64(v1, 31);
v1 *= PRIME64_1;
v2 += p.ReadUInt64() * PRIME64_2;
v2 = XXH_rotl64(v2, 31);
v2 *= PRIME64_1;
v3 += p.ReadUInt64() * PRIME64_2;
v3 = XXH_rotl64(v3, 31);
v3 *= PRIME64_1;
v4 += p.ReadUInt64() * PRIME64_2;
v4 = XXH_rotl64(v4, 31);
v4 *= PRIME64_1;
}while (p.Position <= limit);
h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);
v1 *= PRIME64_2;
v1 = XXH_rotl64(v1, 31);
v1 *= PRIME64_1;
h64 ^= v1;
h64 = h64 * PRIME64_1 + PRIME64_4;
v2 *= PRIME64_2;
v2 = XXH_rotl64(v2, 31);
v2 *= PRIME64_1;
h64 ^= v2;
h64 = h64 * PRIME64_1 + PRIME64_4;
v3 *= PRIME64_2;
v3 = XXH_rotl64(v3, 31);
v3 *= PRIME64_1;
h64 ^= v3;
h64 = h64 * PRIME64_1 + PRIME64_4;
v4 *= PRIME64_2;
v4 = XXH_rotl64(v4, 31);
v4 *= PRIME64_1;
h64 ^= v4;
h64 = h64 * PRIME64_1 + PRIME64_4;
}
else
{
h64 = seed + PRIME64_5;
}
h64 += (ulong)length;
while (p.Position + 8 <= bEnd)
{
ulong k1 = p.ReadUInt64();
k1 *= PRIME64_2;
k1 = XXH_rotl64(k1, 31);
k1 *= PRIME64_1;
h64 ^= k1;
h64 = XXH_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
}
if (p.Position + 4 <= bEnd)
{
h64 ^= (ulong)(p.ReadUInt32()) * PRIME64_1;
h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
}
while (p.Position < bEnd)
{
h64 ^= p.ReadByte() * PRIME64_5;
h64 = XXH_rotl64(h64, 11) * PRIME64_1;
}
h64 ^= h64 >> 33;
h64 *= PRIME64_2;
h64 ^= h64 >> 29;
h64 *= PRIME64_3;
h64 ^= h64 >> 32;
return(h64);
#endif
}
static internal ErrorCode InternalUpdateState64(State64 state, byte[] input, int offset, int length)
{
InputTextStream p = new InputTextStream(input, offset);
long bEnd = p.Position + length;
state.total_len += (ulong)length;
if (state.memsize + length < 32) /* fill in tmp buffer */
{
Array.Copy(input, offset, state.mem64, state.memsize, length);
state.memsize += (uint)length;
return(ErrorCode.XXH_OK);
}
if (state.memsize > 0) /* tmp buffer is full */
{
Array.Copy(input, offset, state.mem64, state.memsize, 32 - state.memsize);
{
InputTextStream p64 = new InputTextStream(state.mem64);
state.v1 += p64.ReadUInt64() * PRIME64_2;
state.v1 = XXH_rotl64(state.v1, 31);
state.v1 *= PRIME64_1;
state.v2 += p64.ReadUInt64() * PRIME64_2;
state.v2 = XXH_rotl64(state.v2, 31);
state.v2 *= PRIME64_1;
state.v3 += p64.ReadUInt64() * PRIME64_2;
state.v3 = XXH_rotl64(state.v3, 31);
state.v3 *= PRIME64_1;
state.v4 += p64.ReadUInt64() * PRIME64_2;
state.v4 = XXH_rotl64(state.v4, 31);
state.v4 *= PRIME64_1;
}
p.Skip(32 - (int)state.memsize);
state.memsize = 0;
}
if (p.Position + 32 <= bEnd)
{
long limit = bEnd - 32;
ulong v1 = state.v1;
ulong v2 = state.v2;
ulong v3 = state.v3;
ulong v4 = state.v4;
do
{
v1 = XXH64_round(v1, p.ReadUInt64());
v2 = XXH64_round(v2, p.ReadUInt64());
v3 = XXH64_round(v3, p.ReadUInt64());
v4 = XXH64_round(v4, p.ReadUInt64());
}while (p.Position <= limit);
state.v1 = v1;
state.v2 = v2;
state.v3 = v3;
state.v4 = v4;
}
if (p.Position < bEnd)
{
Array.Copy(input, p.Position, state.mem64, 0, bEnd - p.Position);
state.memsize = (uint)(bEnd - p.Position);
}
return(ErrorCode.XXH_OK);
}
public static ulong XXH64(byte[] input, int offset, int length, ulong seed)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (input.Rank != 1)
{
ThrowArrayMultiRank("input");
}
if (input.GetLowerBound(0) != 0)
{
ThrowArrayNonZeroLowerBound("input");
}
if (offset < 0)
{
ThrowArgumentNonNegativeNumber("offset");
}
if (length < 0)
{
ThrowArgumentNonNegativeNumber("length");
}
if (input.Length < (offset + length))
{
ThrowArrayInvalidOffsetAndLength();
}
var p = new InputTextStream(input, offset);
long bEnd = p.Position + length;
ulong h64;
if (length >= 32)
{
var limit = bEnd - 32;
var v1 = seed + PRIME64_1 + PRIME64_2;
var v2 = seed + PRIME64_2;
var v3 = seed + 0;
var v4 = seed - PRIME64_1;
do
{
v1 += p.ReadUInt64() * PRIME64_2;
v1 = XXH_rotl64(v1, 31);
v1 *= PRIME64_1;
v2 += p.ReadUInt64() * PRIME64_2;
v2 = XXH_rotl64(v2, 31);
v2 *= PRIME64_1;
v3 += p.ReadUInt64() * PRIME64_2;
v3 = XXH_rotl64(v3, 31);
v3 *= PRIME64_1;
v4 += p.ReadUInt64() * PRIME64_2;
v4 = XXH_rotl64(v4, 31);
v4 *= PRIME64_1;
} while (p.Position <= limit);
h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);
v1 *= PRIME64_2;
v1 = XXH_rotl64(v1, 31);
v1 *= PRIME64_1;
h64 ^= v1;
h64 = h64 * PRIME64_1 + PRIME64_4;
v2 *= PRIME64_2;
v2 = XXH_rotl64(v2, 31);
v2 *= PRIME64_1;
h64 ^= v2;
h64 = h64 * PRIME64_1 + PRIME64_4;
v3 *= PRIME64_2;
v3 = XXH_rotl64(v3, 31);
v3 *= PRIME64_1;
h64 ^= v3;
h64 = h64 * PRIME64_1 + PRIME64_4;
v4 *= PRIME64_2;
v4 = XXH_rotl64(v4, 31);
v4 *= PRIME64_1;
h64 ^= v4;
h64 = h64 * PRIME64_1 + PRIME64_4;
}
else
{
h64 = seed + PRIME64_5;
}
h64 += (ulong)length;
while (p.Position + 8 <= bEnd)
{
var k1 = p.ReadUInt64();
k1 *= PRIME64_2;
k1 = XXH_rotl64(k1, 31);
k1 *= PRIME64_1;
h64 ^= k1;
h64 = XXH_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
}
if (p.Position + 4 <= bEnd)
{
h64 ^= (ulong)(p.ReadUInt32()) * PRIME64_1;
h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
}
while (p.Position < bEnd)
{
h64 ^= p.ReadByte() * PRIME64_5;
h64 = XXH_rotl64(h64, 11) * PRIME64_1;
}
h64 ^= h64 >> 33;
h64 *= PRIME64_2;
h64 ^= h64 >> 29;
h64 *= PRIME64_3;
h64 ^= h64 >> 32;
return(h64);
}
