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| #### SpookyHash
#### Copyright (c) 2023-2024, Remilia Scarlet
#### Copyright (c) 2015, Guillaume Voirin
#### BSD 3-Clause License
####
#### All rights reserved.
####
#### Redistribution and use in source and binary forms, with or without
#### modification, are permitted provided that the following conditions are met:
####
#### Redistributions of source code must retain the above copyright notice,
#### this list of conditions and the following disclaimer.
####
#### Redistributions in binary form must reproduce the above copyright
#### notice, this list of conditions and the following disclaimer in the
#### documentation and/or other materials provided with the distribution.
####
#### Neither the name of the copyright holder nor the names of its
#### contributors may be used to endorse or promote products derived from
#### this software without specific prior written permission.
####
#### THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
#### AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#### ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
#### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
#### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#### INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#### CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#### ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#### POSSIBILITY OF SUCH DAMAGE.
require "./spookyhash/*"
####
#### SpookyHash Implementation, public interface.
####
#### Remi: SpookyHash is meant to be a very fast hash. As such, the internal
#### implementation (in the SpookyHash/ directory) use a lot of unsafe
#### operations to save every last cycle.
####
# An implementation of SpookyHash that produces 128-, 64-, and 32-bit hashes.
class RemiLib::Digest::SpookyHash
@hash : UInt128? = nil
# Creates a new `SpookyHash` instance.
def initialize
end
# Creates a new `SpookyHash` instance. *seed1* is the first eight bytes of a
# custom seed, while *seed2* is the last eight bytes of a custom seed.
def initialize(seed1 : UInt64, seed2 : UInt64)
@state[0] = seed1
@state[1] = seed2
end
{% begin %}
def self.calculate128(input : Bytes, inputHash : UInt128 = 0) : UInt128
hash1, hash2 = splitU128(inputHash)
hash1Ptr : PUInt64 = pointerof(hash1)
hash2Ptr : PUInt64 = pointerof(hash2)
inputPtr : PUInt8 = input.to_unsafe
len = input.size
if len < SPOOKYHASH_BUFFER_SIZE
SpookyHash.short(inputPtr, input.size, hash1Ptr, hash2Ptr)
return makeU128(hash1, hash2)
end
{% for i in 0..11 %}
h{{i}} : UInt64 = 0
h{{i}}Ptr : PUInt64 = pointerof(h{{i}})
{% end %}
buf : Slice(UInt64) = Slice(UInt64).new(SPOOKYHASH_VARIABLES, 0u64)
bufPtr : PUInt64 = buf.to_unsafe
u : SpookyHashLib::DataUnion128 = SpookyHashLib::DataUnion128.new
remainder : Int32 = 0
h0 = h3 = h6 = h9 = hash1
h1 = h4 = h7 = h10 = hash2
h2 = h5 = h8 = h11 = SPOOKYHASH_CONSTANT
u.p8 = inputPtr
finish : PUInt64 = u.p64 + (len.tdiv(SPOOKYHASH_BLOCK_SIZE) &* SPOOKYHASH_VARIABLES)
if true || !bitflag?(u.i, 0x07)
while u.p64 < finish
mix(u.p64, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
u.p64 += SPOOKYHASH_VARIABLES
end
else
while u.p64 < finish
bufPtr.copy_from(u.p64, SPOOKYHASH_BLOCK_SIZE)
mix(bufPtr, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
u.p64 += SPOOKYHASH_VARIABLES
end
end
remainder = len &- (finish.unsafe_as(PUInt8) - inputPtr)
bufPtr.copy_from(finish, remainder)
# Hacky memset-ish thing
bufPtrP8 = bufPtr.unsafe_as(PUInt8) + remainder
(SPOOKYHASH_BLOCK_SIZE &- remainder).times do |i|
bufPtrP8[i] = 0u8
end
bufPtr.unsafe_as(PUInt8)[SPOOKYHASH_BLOCK_SIZE &- 1] = remainder.to_u8!
finish(bufPtr, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
makeU128(h0, h1)
end
{% end %}
def self.calculate64(input : Bytes, seed : UInt64 = 0) : UInt64
inputHash = makeU128(seed, seed)
calculate128(input, inputHash).to_u64!
end
def self.calculate32(input : Bytes, seed : UInt32 = 0) : UInt32
inputHash = makeU128(seed.to_u64!, seed.to_u64!)
calculate128(input, inputHash).to_u32!
end
{% begin %}
def update(input : Bytes) : Nil
@hash = nil
inputPtr : PUInt8 = input.to_unsafe
len = input.size
newLen : Int32 = len &+ @remainder
dataPtr : PUInt64 = @data.to_unsafe
if newLen < SPOOKYHASH_BUFFER_SIZE
(dataPtr.unsafe_as(PUInt8) + @remainder).copy_from(inputPtr, len)
@length = len.to_i64! &+ @length
@remainder = newLen.to_u8!
return
end
{% for i in 0..11 %}
h{{i}} : UInt64 = 0
h{{i}}Ptr : PUInt64 = pointerof(h{{i}})
{% end %}
remainder : UInt8 = 0
u : SpookyHashLib::DataUnion128 = SpookyHashLib::DataUnion128.new
if @length < SPOOKYHASH_BUFFER_SIZE
h0 = h3 = h6 = h9 = @state.unsafe_fetch(0)
h1 = h4 = h7 = h10 = @state.unsafe_fetch(1)
h2 = h5 = h8 = h11 = SPOOKYHASH_CONSTANT
else
{% for i in 0..11 %}
h{{i}} = @state.unsafe_fetch({{i}})
{% end %}
end
@length = len.to_i64! &+ @length
if @remainder != 0
prefix : UInt8 = (SPOOKYHASH_BUFFER_SIZE &- @remainder).to_u8!
(dataPtr.unsafe_as(PUInt8) + @remainder).copy_from(inputPtr, prefix)
u.p64 = dataPtr
SpookyHash.mix(u.p64, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
SpookyHash.mix(u.p64 + SPOOKYHASH_VARIABLES,
h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
u.p8 = inputPtr + prefix
len = len &- prefix
else
u.p8 = inputPtr
end
finish : PUInt64 = u.p64 + (len.tdiv(SPOOKYHASH_BLOCK_SIZE) &* SPOOKYHASH_VARIABLES)
remainder = (len.to_u64! &- (finish.unsafe_as(PUInt8) - u.p8)).to_u8!
unless bitflag?(u.i, 0x07)
while u.p64 < finish
SpookyHash.mix(u.p64, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
u.p64 += SPOOKYHASH_VARIABLES
end
else
while u.p64 < finish
dataPtr.unsafe_as(PUInt8).copy_from(u.p8, SPOOKYHASH_BLOCK_SIZE)
SpookyHash.mix(dataPtr, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
u.p64 += SPOOKYHASH_VARIABLES
end
end
@remainder = remainder
dataPtr.copy_from(finish, remainder)
{% for i in 0..11 %}
@state.unsafe_put({{i}}, h{{i}})
{% end %}
end
{% end %}
{% begin %}
def hash : UInt128
# Return memoized value if possible.
@hash.try { |ret| return ret }
dataPtr : PUInt64 = @data.to_unsafe
if @length < SPOOKYHASH_BUFFER_SIZE
hash1 : UInt64 = @state.unsafe_fetch(0)
hash2 : UInt64 = @state.unsafe_fetch(1)
SpookyHash.short(dataPtr.unsafe_as(PUInt8), @length, pointerof(hash1), pointerof(hash2))
@hash = makeU128(hash1, hash2)
return @hash.not_nil!
end
remainder : UInt8 = @remainder
{% for i in 0..11 %}
h{{i}} : UInt64 = @state.unsafe_fetch({{i}})
h{{i}}Ptr : PUInt64 = pointerof(h{{i}})
{% end %}
if remainder >= SPOOKYHASH_BLOCK_SIZE
SpookyHash.mix(dataPtr, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
dataPtr += SPOOKYHASH_VARIABLES
remainder = remainder &- SPOOKYHASH_BLOCK_SIZE
end
dataPtrRem : PUInt8 = dataPtr.unsafe_as(PUInt8) + remainder
(SPOOKYHASH_BLOCK_SIZE &- remainder).times do |i|
dataPtrRem[i] = 0
end
dataPtr.unsafe_as(PUInt8)[SPOOKYHASH_BLOCK_SIZE &- 1] = remainder
SpookyHash.finish(dataPtr, h0Ptr, h1Ptr, h2Ptr, h3Ptr, h4Ptr, h5Ptr, h6Ptr, h7Ptr, h8Ptr, h9Ptr, h10Ptr, h11Ptr)
@hash = makeU128(h0, h1)
@hash.not_nil!
end
{% end %}
def hash64 : UInt64
hash.to_u64!
end
def hash32 : UInt32
hash.to_u32!
end
end
|