module DicomUID

DICOM UID Generator according to the DICOM documentation dicom.nema.org/dicom/2013/output/chtml/part05/chapter_9.html

The UID looks like the following <org>.<suffix> UID is composed of two main components, org and suffix. Components are separated by a dot and are only composed of decimals. The UID must not be more than 64 characters, dots included.

Public Class Methods

random_component(length = 62, odd_byte_boundary = true) click to toggle source

Generates random component with defined, maximum length The maximum length is 62. Why ? Because an UID has at least an org_root and a suffix, and they are separated by a dot, which makes 1 character minimum and 62 characters maximum

# File lib/dicom_uid.rb, line 40
def self.random_component length = 62, odd_byte_boundary = true

  # exceptions
  raise TypeError unless length.is_a? Integer and odd_byte_boundary == !!odd_byte_boundary
  raise RangeError, "Length of a component cannot be negative or null" if length <= 0
  raise OversizedUIDError if length > 62

  # randing length of number
  length_component = 0
  while (length_component == length - 1) or length_component == 0
    srand
    length_component = rand 0..length
  end

  # randing the component: length
  component = '9' * (length - 1)
  while component.length == length - 1
    component = (rand ('9' * length_component).to_i).to_s
  end



  if odd_byte_boundary and !odd_byte_rule component# if odd number
    component << '0'
    component = component[1..-1]# removing first int
  end

  component
end

random_dicom_uid(org_root, fixed_size, odd_byte_boundary = true) click to toggle source

set default values, with org_root if needed the size of the UID is randomized fixed_size is the size ogf the whole UID, with the org taken into account

# File lib/dicom_uid.rb, line 12
def self.random_dicom_uid org_root, fixed_size, odd_byte_boundary = true

  raise TypeError, 'Org root must be a string or an Integer' unless org_root.is_a? String or org_root.is_a? Integer
  org_root = org_root.to_s if org_root.is_a? Integer
  raise TypeError unless fixed_size.is_a? Integer and odd_byte_boundary == !!odd_byte_boundary

  # building the org root
  org_root = self.random_component(62, odd_byte_boundary) if org_root.empty?# UID needs at least an org root
  raise LeadingZeroError if leading_zero? org_root
  raise OddByteError if !odd_byte_rule(org_root) and odd_byte_boundary

  # if the fixed size doesn't exist, a random one is created, but
  # it must be generated so that the UID musn't be above 64 chars
  fixed_size ||= rand(0..(64 - org_root.length - 1))
  fixed_size -= 1 if add_missing_dot org_root

  raise OversizedUIDError if fixed_size > 64
  raise RangeError, 'Size of Org root larger than size provided' if fixed_size < org_root.length
  raise RangeError, "Size of UID can't be negative" if fixed_size < 0

  # building the suffix
  self.rand_duid org_root, (fixed_size - org_root.length), odd_byte_boundary
end

random_uids(org_root, fixed_size, array_size, odd_byte_boundary = true) click to toggle source

Return an array of UIDs, from a common org root

# File lib/dicom_uid.rb, line 71
def self.random_uids org_root, fixed_size, array_size, odd_byte_boundary = true
  uids = Array.new array_size

  array_size.times do |i|
    uids[i] = (self.random_dicom_uid org_root.dup, fixed_size, odd_byte_boundary)
  end

  uids
end