Module: CityHash

Defined in:
lib/cityhash.rb,
lib/cityhash/version.rb,
ext/cityhash/cityhash.cc

Defined Under Namespace

Modules: Internal

Constant Summary collapse

LOW64_MASK = 
0x0000000000000000ffffffffffffffff
HIGH64_MASK = 
0xffffffffffffffff0000000000000000
VERSION = 
"0.7.0"

Class Method Summary collapse

Class Method Details

.hash128(input, seed = nil) ⇒ Object 



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# File 'lib/cityhash.rb', line 18

def self.hash128(input, seed=nil)
  if seed
    seed = [seed & LOW64_MASK, seed & HIGH64_MASK >> 64].pack('QQ')
    digest = Internal.hash128_with_seed(input, seed)
  else
    digest = Internal.hash128(input)
  end
  [0..7, 8..15].map { |r| digest[r].unpack('Q').first.to_s }.join.to_i
end

.hash32(input) ⇒ Object 



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# File 'lib/cityhash.rb', line 8

def self.hash32(input)
  Internal.hash32(input)
end

.hash64(input, seed1 = nil, seed2 = nil) ⇒ Object 



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# File 'lib/cityhash.rb', line 12

def self.hash64(input, seed1=nil, seed2=nil)
  return Internal.hash64(input) if seed1.nil?
  return Internal.hash64_with_seed(input, seed1.to_i) if seed2.nil?
  Internal.hash64_with_seeds(input, seed1.to_i, seed2.to_i)
end