Class: Digest::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/rook/helper/digest.rb

Class Method Summary collapse

Class Method Details

.create_from_file(filename) ⇒ Object

create digest object from file content

ex.

require 'digest/md5'
digest = Digest::MD5.create_from_file('largefile.mov')
puts digest.hexdigest

this is faster than ‘Digest::MD5.new(File.read(“largefile.mov”))’ when file size is large.



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# File 'lib/rook/helper/digest.rb', line 26

def self.create_from_file(filename)
  digest = self.new
  File.open(filename) do |f|
    #size =   4 * 1024   #   4KB
    #size =   8 * 1024   #   8KB
     size =  16 * 1024   #  16KB
    #size =  32 * 1024   #  32KB
    #size =  64 * 1024   #  64KB
    #size = 128 * 1024   # 128KB
    #size = 256 * 1024   # 256KB
    #size = 512 * 1024   # 512KB
    #size = 1 * 1024 * 1024  # 1MB
    #size = 4 * 1024 * 1024  # 4MB
    buf = ''
    digest.update(buf) while f.read(size, buf)
  end
  return digest
end

.file_digest(filename) ⇒ Object

return digest value of file content

ex.

require 'digest/md5'
puts Digest::MD5.digest('largefile.mov')

this is faster than ‘Digest::MD5.digest(File.read(filename))’ when file size is large.



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# File 'lib/rook/helper/digest.rb', line 71

def self.file_digest(filename)
  return self.create_from_file(filename).digest
end

.file_hexdigest(filename) ⇒ Object

return hex-digest value of file content

ex.

require 'digest/md5'
puts Digest::MD5.hex_digest('largefile.mov')

this is faster than ‘Digest::MD5.hex_digest(File.read(filename))’ when file size is large.



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# File 'lib/rook/helper/digest.rb', line 56

def self.file_hexdigest(filename)
  return self.create_from_file(filename).hexdigest
end