module SamplingHash

Constants

VERSION

Public Class Methods

hash(path, seed = File.size(path), hash = XXhash::XXhashInternal::StreamingHash64.new(seed)) click to toggle source

We default to 64 bit xxhash.

# File lib/sampling-hash.rb, line 9
def self.hash(path, seed = File.size(path), hash = XXhash::XXhashInternal::StreamingHash64.new(seed))
  raise ArgumentError, 'file not found' unless File.file?(path)

  File.open(path, 'r') do |fd|

    sio = SamplingIO.new(fd)
    sio.samples do |chunk|
      hash.update(chunk)
    end

    hash.digest

  end
end
hash32(path, seed = File.size(path)) click to toggle source 
# File lib/sampling-hash.rb, line 24
def self.hash32(path, seed = File.size(path))
  hash path, seed, XXHash::XXhashInternal::StreamingHash32.new(seed)
end
hash64(path, seed = File.size(path)) click to toggle source 
# File lib/sampling-hash.rb, line 28
def self.hash64(path, seed = File.size(path))
  hash path, seed, XXHash::XXhashInternal::StreamingHash64.new(seed)
end