Add bin and edit workflow

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

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module TTFunk
+  # SFNT table directory.
+  class Directory
+    # Table descriptors
+    # @return [Hash{String => Hash}]
+    attr_reader :tables
+
+    # Scaler type
+    # @return [Integer]
+    attr_reader :scaler_type
+
+    def initialize(io, offset = 0)
+      io.seek(offset)
+
+      # https://www.microsoft.com/typography/otspec/otff.htm#offsetTable
+      # We're ignoring searchRange, entrySelector, and rangeShift here, but
+      # skipping past them to get to the table information.
+      @scaler_type, table_count = io.read(12).unpack('Nn')
+
+      @tables = {}
+      table_count.times do
+        tag, checksum, offset, length = io.read(16).unpack('a4N*')
+        @tables[tag] = {
+          tag: tag,
+          checksum: checksum,
+          offset: offset,
+          length: length,
+        }
+      end
+    end
+  end
+end