diff --git a/src/HTMLRenderer.h b/src/HTMLRenderer.h
index 8d26ca6..ffc38bd 100644
--- a/src/HTMLRenderer.h
+++ b/src/HTMLRenderer.h
@@ -12,6 +12,7 @@
 #include <vector>
 #include <set>
 #include <sstream>
+#include <cstdint>
 
 #include <boost/format.hpp>
 #include <boost/filesystem/fstream.hpp>
@@ -269,6 +270,9 @@ class HTMLRenderer : public OutputDev
         double line_ascent, line_height;
         std::stringstream line_buf; 
 
+        // for font reencoding
+        int32_t * cur_mapping;
+
         ////////////////////////////////////////////////////
         // styles & resources
         ////////////////////////////////////////////////////
diff --git a/src/HTMLRenderer/general.cc b/src/HTMLRenderer/general.cc
index 9de3d4d..3bc60f1 100644
--- a/src/HTMLRenderer/general.cc
+++ b/src/HTMLRenderer/general.cc
@@ -28,11 +28,13 @@ HTMLRenderer::HTMLRenderer(const Param * param)
     ,tmp_dir(param->tmp_dir)
 {
     ff_init();
+    cur_mapping = new int32_t [0x10000];
 }
 
 HTMLRenderer::~HTMLRenderer()
 { 
     clean_tmp_files();
+    delete [] cur_mapping;
 }
 
 void HTMLRenderer::process(PDFDoc *doc)
diff --git a/src/HTMLRenderer/text.cc b/src/HTMLRenderer/text.cc
index 1ce27a9..4543b6b 100644
--- a/src/HTMLRenderer/text.cc
+++ b/src/HTMLRenderer/text.cc
@@ -209,6 +209,7 @@ void HTMLRenderer::embed_font(const path & filepath, GfxFont * font, FontInfo &
             else
             {
                 // move the slot such that it's consistent with the encoding seen in PDF
+                // TODO: build encoding directly
                 ofstream out(tmp_dir / (fn + "_.encoding"));
                 add_tmp_file(fn+"_.encoding");
                 
@@ -277,31 +278,24 @@ void HTMLRenderer::embed_font(const path & filepath, GfxFont * font, FontInfo &
          * - For 8bit nonTruetype fonts:
          *   Try to calculate the correct Unicode value from the glyph names, unless param->always_apply_tounicode is set
          * 
-         * TODO: build Encoding directly, without read/write files
          */
 
-        auto ctu = font->getToUnicode();
-        int cnt = 0;
 
         {
-            ofstream map_fout(tmp_dir / (fn + ".encoding"));
-            add_tmp_file(fn+".encoding");
+            auto ctu = font->getToUnicode();
+            memset(cur_mapping, 0, maxcode * sizeof(int32_t));
 
             for(int i = 0; i <= maxcode; ++i)
             {
                 if((suffix != ".ttf") && (font_8bit != nullptr) && (font_8bit->getCharName(i) == nullptr))
+                {
                     continue;
-
-                ++ cnt;
-                map_fout << format("0x%|1$X|") % ((code2GID && (i < code2GID_len))? code2GID[i] : i);
+                }
 
                 Unicode u, *pu=&u;
-
                 if(info.use_tounicode)
                 {
-                    int n = 0;
-                    if(ctu)
-                        n = ctu->mapToUnicode(i, &pu);
+                    int n = ctu ? (ctu->mapToUnicode(i, &pu)) : 0;
                     u = check_unicode(pu, n, i, font);
                 }
                 else
@@ -309,21 +303,14 @@ void HTMLRenderer::embed_font(const path & filepath, GfxFont * font, FontInfo &
                     u = unicode_from_font(i, font);
                 }
 
-                map_fout << format(" 0x%|1$X|") % u;
-                map_fout << format(" # 0x%|1$X|") % i;
-
-                map_fout << endl;
+                cur_mapping[((code2GID && (i < code2GID_len))? code2GID[i] : i)] = u;
             }
-        }
 
-        if(cnt > 0)
-        {
-            ff_load_encoding((tmp_dir / (fn+".encoding")).c_str(), fn.c_str());
-            ff_reencode(fn.c_str(), 1);
-        }
+            ff_reencode_raw(cur_mapping, maxcode, 1);
 
-        if(ctu)
-            ctu->decRefCnt();
+            if(ctu)
+                ctu->decRefCnt();
+        }
     }
 
     auto dest = ((param->single_html ? tmp_dir : dest_dir) / (fn+(param->font_suffix)));
diff --git a/src/ff/ff.c b/src/ff/ff.c
index f8f69a9..777fbe7 100644
--- a/src/ff/ff.c
+++ b/src/ff/ff.c
@@ -42,6 +42,13 @@ static int max(int a, int b)
     return (a>b) ? a : b;
 }
 
+static void dummy(const char * format, ...)
+{
+    va_list al;
+    va_start(al, format);
+    va_end(al);
+}
+
 void ff_init(void)
 {
     InitSimpleStuff();
@@ -49,6 +56,9 @@ void ff_init(void)
         default_encoding=FindOrMakeEncoding("ISO8859-1");
     if ( default_encoding==NULL )
         default_encoding=&custom;	/* In case iconv is broken */
+
+    //disable error output of Fontforge
+    ui_interface->logwarning = &dummy;
 }
 void ff_load_font(const char * filename)
 {
@@ -91,6 +101,28 @@ void ff_reencode(const char * encname, int force)
     SFReplaceEncodingBDFProps(cur_font, cur_font->fv->map);
 }
 
+void ff_reencode_raw(int32 * mapping, int mapping_len, int force)
+{
+    Encoding * enc = calloc(1, sizeof(Encoding));
+    enc->only_1byte = enc->has_1byte = true;
+    enc->char_cnt = mapping_len;
+    enc->unicode = (int32_t*)malloc(mapping_len * sizeof(int32_t));
+    memcpy(enc->unicode, mapping, mapping_len * sizeof(int32_t));
+    enc->enc_name = strcopy("");
+
+    if(force)
+    {
+        SFForceEncoding(cur_font, cur_font->fv->map, enc);
+    }
+    else
+    {
+        EncMapFree(cur_font->fv->map);
+        cur_font->fv->map= EncMapFromEncoding(cur_font, enc);
+    }
+
+    SFReplaceEncodingBDFProps(cur_font, cur_font->fv->map);
+}
+
 void ff_cidflatten(void)
 {
     printf("cid flatten\n");
diff --git a/src/ff/ff.h b/src/ff/ff.h
index c43fc04..31df702 100644
--- a/src/ff/ff.h
+++ b/src/ff/ff.h
@@ -10,14 +10,19 @@
  * 2012.09.03
  */
 
+
 #ifdef __cplusplus
+#include <cstdint>
 extern "C" {
+#else
+#include <stdint.h>
 #endif
 
 void ff_init(void);
 void ff_load_font(const char * filename);
 void ff_load_encoding(const char * filename, const char * encname);
 void ff_reencode(const char * encname, int force);
+void ff_reencode_raw(int32_t * mapping, int mapping_len, int force);
 void ff_cidflatten(void);
 void ff_save(const char * filename);
 void ff_close(void);