Add bin and edit workflow

bin/gems/pdf-reader-2.14.1/lib/pdf/reader/cid_widths.rb

@@ -0,0 +1,66 @@
+# coding: utf-8
+# typed: strict
+# frozen_string_literal: true
+
+require 'forwardable'
+
+class PDF::Reader
+  # A Hash-like object that wraps the array of glyph widths in a CID font
+  # and gives us a nice way to query it for specific widths.
+  #
+  # there are two ways to calculate a cidfont_glyph_width, that are defined
+  # in Section 9.7.4.3 PDF 32000-1:2008 pp 271, the differences are remarked
+  # on below. because of these difference that may be contained within the
+  # same array, it is a bit difficult to parse this array.
+  class CidWidths
+    extend Forwardable
+
+    # Graphics State Operators
+    def_delegators :@widths, :[], :fetch
+
+    def initialize(default, array)
+      @widths = parse_array(default, array.dup)
+    end
+
+    private
+
+    def parse_array(default, array)
+      widths  = Hash.new(default)
+      params = []
+      while array.size > 0
+        params << array.shift
+
+        if params.size == 2 && params.last.is_a?(Array)
+          widths.merge! parse_first_form(params.first.to_i, Array(params.last))
+          params = []
+        elsif params.size == 3
+          widths.merge! parse_second_form(params[0].to_i, params[1].to_i, params[2].to_i)
+          params = []
+        end
+      end
+      widths
+    end
+
+    # this is the form 10 [234 63 234 346 47 234] where width of index 10 is
+    # 234, index 11 is 63, etc
+    def parse_first_form(first, widths)
+      widths.inject({}) { |accum, glyph_width|
+        accum[first + accum.size] = glyph_width
+        accum
+      }
+    end
+
+    # this is the form 10 20 123 where all index between 10 and 20 have width 123
+    def parse_second_form(first, final, width)
+      if first > final
+        raise MalformedPDFError, "CidWidths: #{first} must be less than #{final}"
+      end
+
+      (first..final).inject({}) { |accum, index|
+        accum[index] = width
+        accum
+      }
+    end
+
+  end
+end