Add bin and edit workflow

bin/gems/ttfunk-1.8.0/lib/ttfunk/reader.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+module TTFunk
+  # Helper methods to read form file content.
+  # @api rpivate
+  module Reader
+    private
+
+    def io
+      @file.contents
+    end
+
+    def read(bytes, format)
+      io.read(bytes).unpack(format)
+    end
+
+    def read_signed(count)
+      read(count * 2, 'n*').map { |i| to_signed(i) }
+    end
+
+    def to_signed(number)
+      number >= 0x8000 ? -((number ^ 0xFFFF) + 1) : number
+    end
+
+    def parse_from(position)
+      saved = io.pos
+      io.pos = position
+      result = yield(position)
+      io.pos = saved
+      result
+    end
+
+    # For debugging purposes
+    def hexdump(string)
+      bytes = string.unpack('C*')
+      bytes.each_with_index do |c, i|
+        printf('%02X', c)
+        if ((i + 1) % 16).zero?
+          puts
+        elsif ((i + 1) % 8).zero?
+          print('  ')
+        else
+          print(' ')
+        end
+      end
+      puts if (bytes.length % 16) != 0
+    end
+  end
+end