Make all adapters read IO object before load

Related #156

Author: rwz

lib/multi_json/adapter.rb

@@ -17,6 +17,7 @@ def defaults(action, value)
 
       def load(string, options={})
         raise self::ParseError if blank?(string)
+        string = string.read if string.respond_to?(:read)
         instance.load(string, load_options(options).merge(MultiJson.load_options(options)).merge!(options))
       end
 

lib/multi_json/adapters/gson.rb

@@ -9,7 +9,6 @@ class Gson < Adapter
       ParseError = ::Gson::DecodeError
 
       def load(string, options={})
-        string = string.read if StringIO === string
         ::Gson::Decoder.new(options).decode(string)
       end
 

lib/multi_json/adapters/json_common.rb

@@ -6,8 +6,6 @@ class JsonCommon < Adapter
       defaults :load, :create_additions => false, :quirks_mode => true
 
       def load(string, options={})
-        string = string.read if string.respond_to?(:read)
-
         if string.respond_to?(:force_encoding)
           string = string.dup.force_encoding(::Encoding::ASCII_8BIT)
         end

lib/multi_json/adapters/nsjsonserialization.rb

@@ -7,7 +7,6 @@ class Nsjsonserialization < MultiJson::Adapters::OkJson
       ParseError = ::MultiJson::OkJson::Error
 
       def load(string, options={})
-        string = string.read if string.respond_to?(:read)
         data = string.dataUsingEncoding(NSUTF8StringEncoding)
         object = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves, error: nil)
         if object

lib/multi_json/adapters/ok_json.rb

@@ -9,7 +9,6 @@ class OkJson < Adapter
       ParseError = ::MultiJson::OkJson::Error
 
       def load(string, options={})
-        string = string.read if string.respond_to?(:read)
         result = ::MultiJson::OkJson.decode("[#{string}]").first
         options[:symbolize_keys] ? symbolize_keys(result) : result
       rescue ArgumentError # invalid byte sequence in UTF-8