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diff --git a/src/static_sequence/wt_coder.cpp b/src/static_sequence/wt_coder.cpp
new file mode 100644
index 0000000..4735ee5
--- /dev/null
+++ b/src/static_sequence/wt_coder.cpp
@@ -0,0 +1,46 @@
+/* wt_coder.cpp
+ * Copyright (C) 2008, Francisco Claude, all rights reserved.
+ *
+ * wt_coder definition
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+ 
+#include <wt_coder.h>
+
+wt_coder::wt_coder() {
+	user_count=0;
+}
+
+void wt_coder::use() {
+	user_count++;
+}
+
+void wt_coder::unuse() {
+	user_count--;
+	if(user_count==0) delete this;
+}
+
+wt_coder * wt_coder::load(FILE *fp) {
+  uint rd;
+  if(fread(&rd,sizeof(uint),1,fp)!=1) return NULL;
+  fseek(fp,-sizeof(uint),SEEK_CUR);
+  switch(rd) {
+    case WT_CODER_HUFF_HDR: return wt_coder_huff::load(fp);
+    case WT_CODER_BINARY_HDR: return wt_coder_binary::load(fp);
+  }
+  return NULL;
+}