Add bin and edit workflow

bin/gems/ttfunk-1.8.0/lib/ttfunk/table/loca.rb

@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require_relative '../table'
+
+module TTFunk
+  class Table
+    # Index to Location table.
+    class Loca < Table
+      # Glyph ofsets
+      # @return [Array<Integer>]
+      attr_reader :offsets
+
+      # Encode table.
+      #
+      # @param offsets [Array<Integer>] an array of offsets, with each index
+      #   corresponding to the glyph id with that index.
+      # @return [Hash] result hash:
+      #   * `:type` - the type of offset (to be encoded in the 'head' table):
+      #     * `0` - short offsets
+      #     * `1` - long offsets
+      #   * `:table` - encoded bytes
+      def self.encode(offsets)
+        long_offsets =
+          offsets.any? { |offset|
+            short_offset = offset / 2
+            short_offset * 2 != offset || short_offset > 0xffff
+          }
+
+        if long_offsets
+          { type: 1, table: offsets.pack('N*') }
+        else
+          { type: 0, table: offsets.map { |o| o / 2 }.pack('n*') }
+        end
+      end
+
+      # Glyph offset by ID.
+      #
+      # @param glyph_id [Integer]
+      # @return [Integer] - offset of the glyph in the `glyf` table
+      def index_of(glyph_id)
+        @offsets[glyph_id]
+      end
+
+      # Size of encoded glyph.
+      #
+      # @param glyph_id [Integer]
+      # @return [Integer]
+      def size_of(glyph_id)
+        @offsets[glyph_id + 1] - @offsets[glyph_id]
+      end
+
+      private
+
+      def parse!
+        type = file.header.index_to_loc_format.zero? ? 'n' : 'N'
+        @offsets = read(length, "#{type}*")
+
+        if file.header.index_to_loc_format.zero?
+          @offsets.map! { |v| v * 2 }
+        end
+      end
+    end
+  end
+end