loading font from memory stream

font_engine_freetype.diff

diff --git a/src/font_engine_freetype.cpp b/src/font_engine_freetype.cpp
index 5f14544..a579989 100644
--- a/src/font_engine_freetype.cpp
+++ b/src/font_engine_freetype.cpp
@@ -30,6 +30,7 @@
 #include <mapnik/pixel_position.hpp>
 #include <mapnik/font_util.hpp>
 #include <mapnik/util/fs.hpp>
+#include <mapnik/utils.hpp>
 
 // boost
 #include <boost/algorithm/string.hpp>
@@ -102,7 +103,24 @@ bool freetype_engine::register_font(std::string const& file_name)
     // see the FT_FaceRec in freetype.h
     for ( int i = 0; face == 0 || i < num_faces; i++ ) {
         // if face is null then this is the first face
-        error = FT_New_Face (library,file_name.c_str(),i,&face);
+        try
+        {
+#ifdef _WINDOWS
+        std::ifstream is(mapnik::utf8_to_utf16(file_name), std::ios::binary);
+#else
+        std::ifstream is(file_name.c_str() , std::ios::binary);
+#endif
+        std::string buffer((std::istreambuf_iterator<char>(is)),
+                           std::istreambuf_iterator<char>());
+        if (buffer.size() <= 0)
+        {
+            break;
+        }
+        error = FT_New_Memory_Face (library,
+                                     (FT_Byte const*) buffer.c_str(),
+                                     buffer.size(),
+                                     i,
+                                     &face);
         if (error)
         {
             break;
@@ -135,6 +153,9 @@ bool freetype_engine::register_font(std::string const& file_name)
 
             MAPNIK_LOG_DEBUG(font_engine_freetype) << "freetype_engine: " << s.str();
         }
+        } catch (std::exception const&) {
+            break;
+        }
     }
     if (face)
         FT_Done_Face(face);
@@ -234,7 +255,11 @@ face_ptr freetype_engine::create_face(std::string const& family_name)
 #ifdef MAPNIK_THREADSAFE
             mutex::scoped_lock lock(mutex_);
 #endif
+#ifdef _WINDOWS
+            std::ifstream is(mapnik::utf8_to_utf16(itr->second.second), std::ios::binary);
+#else
             std::ifstream is(itr->second.second.c_str() , std::ios::binary);
+#endif
             std::string buffer((std::istreambuf_iterator<char>(is)),
                                std::istreambuf_iterator<char>());
             std::pair<std::map<std::string,std::string>::iterator,bool> result