adds first version of the expanded as assembler from mikko

lib/elf/string_table_section.rb

@@ -0,0 +1,29 @@
+module Elf
+  class StringTableSection < Section
+    def initialize(*args)
+      super
+
+      @string_data = "\x00"
+      @indices = {"" => 0}
+    end
+
+    def add_string(str)
+      return if @indices[str]
+
+      @indices[str] = @string_data.length
+      @string_data << str << "\x00"
+    end
+
+    def index_for(str)
+      @indices[str]
+    end
+
+    def write(io)
+      io << @string_data
+    end
+
+    def type
+      Elf::Constants::SHT_STRTAB
+    end
+  end
+end