Got collation working, though it's super slow

lib/ffi-icu/collation.rb

@@ -39,8 +39,8 @@ module ICU
         array.sort do |a,b|
           Lib.ucol_strcoll(
             @c,
-            UCharPointer.from_string(a), a.length,
-            UCharPointer.from_string(b), b.length
+            UCharPointer.from_string(a), a.size,
+            UCharPointer.from_string(b), b.size
           )
         end
       end

lib/ffi-icu/uchar.rb

@@ -1,21 +1,11 @@
+require 'iconv'
+
 module ICU
+
   class UCharPointer < FFI::MemoryPointer
     def self.from_string(str)
-      bytes = str.bytes.to_a
-    
-      ptr = new(:uint16, bytes.size)
-      ptr.put_array_of_uint16(0, bytes)
-    
-      ptr
+      super Iconv.conv("wchar_t", "utf-8", str.encode("UTF-8"))
     end
   end
-  
-  # class UCharIteratorPointer < FFI::MemoryPointer
-  #   def self.from_string(str)
-  #     ptr = new(:pointer, 4)
-  #     Lib.uiter_setUTF8(ptr, str, str.length)
-  #     ptr
-  #   end
-  # end
-  
-end
+
+end