Class: FNV

Inherits:
Object
  • Object
show all
Defined in:
lib/growthbook/fnv.rb

Overview

FNV Source

Constant Summary collapse

INIT32 = 
0x811c9dc5
INIT64 = 
0xcbf29ce484222325
PRIME32 = 
0x01000193
PRIME64 = 
0x100000001b3
MOD32 = 
4_294_967_296
MOD64 = 
18_446_744_073_709_551_616

Instance Method Summary collapse

Instance Method Details

#fnv1a_32(data) ⇒ Object

Hashes UTF-16 code units, like JavaScript's charCodeAt, so a character above U+FFFF counts as two units



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# File 'lib/growthbook/fnv.rb', line 15

def fnv1a_32(data)
  hash = INIT32

  units = data.ascii_only? ? data.bytes : data.encode('UTF-16LE').unpack('v*').map(&:to_i)
  units.each do |unit|
    hash = hash ^ unit
    hash = (hash * PRIME32) % MOD32
  end

  hash
end