Add bin and edit workflow

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

@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require_relative 'reader'
+
+module TTFunk
+  # SFNT sub-table
+  class SubTable
+    # A read past sub-table end was attempted.
+    class EOTError < StandardError
+    end
+
+    include Reader
+
+    # File or IO this sub-table is in.
+    # @return [IO]
+    attr_reader :file
+
+    # This sub-table's offset from the file beginning.
+    # @return [Integer]
+    attr_reader :table_offset
+
+    # This sub-table's length in byes.
+    # @return [Integer, nil]
+    attr_reader :length
+
+    # @param file [IO]
+    # @param offset [Integer]
+    # @param length [Integer]
+    def initialize(file, offset, length = nil)
+      @file = file
+      @table_offset = offset
+      @length = length
+      parse_from(@table_offset) { parse! }
+    end
+
+    # End of sub-table?
+    #
+    # @return [Boolean]
+    def eot?
+      # if length isn't set yet there's no way to know if we're at the end of
+      # the sub-table or not
+      return false unless length
+
+      io.pos > table_offset + length
+    end
+
+    # Read a series of values.
+    #
+    # @overload read(bytes, format)
+    #   @param bytes [Integer] number of bytes to read.
+    #   @param format [String] format to parse the bytes.
+    #   @return [Array]
+    #   @raise [EOTError]
+    #   @see # Ruby Packed data
+    def read(*args)
+      if eot?
+        raise EOTError, 'attempted to read past the end of the table'
+      end
+
+      super
+    end
+  end
+end