axlsx.rb in axlsx-3.0.0.pre

- old
+ new

@@ -1,18 +1,19 @@
 # encoding: UTF-8
 require 'htmlentities'
 require 'axlsx/version.rb'
+require 'mimemagic'
 
 require 'axlsx/util/simple_typed_list.rb'
 require 'axlsx/util/constants.rb'
 require 'axlsx/util/validators.rb'
 require 'axlsx/util/accessors.rb'
 require 'axlsx/util/serialized_attributes'
 require 'axlsx/util/options_parser'
 # to be included with parsable intitites.
 #require 'axlsx/util/parser.rb'
-require 'axlsx/util/string'
+require 'axlsx/util/mime_type_utils'
 
 require 'axlsx/stylesheet/styles.rb'
 
 require 'axlsx/doc_props/app.rb'
 require 'axlsx/doc_props/core.rb'
@@ -132,13 +133,17 @@
   # returns the provided string with all invalid control charaters
   # removed.
   # @param [String] str The string to process
   # @return [String]
   def self.sanitize(str)
-    str.delete!(CONTROL_CHARS)
-    str
+    if str.frozen?
+      str.delete(CONTROL_CHARS)
+    else
+      str.delete!(CONTROL_CHARS)
+      str
+    end
   end
-  
+
   # If value is boolean return 1 or 0
   # else return the value
   # @param [Object] value The value to process
   # @return [Object]
   def self.booleanize(value)