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diff --git a/swcsa/interface.h b/swcsa/interface.h
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+
+/* General interface for using the compressed index libraries */
+
+#ifndef uchar
+#define uchar unsigned char
+#endif
+#ifndef uint
+#define uint  unsigned int
+#endif
+#ifndef ulong
+#define ulong unsigned long
+#endif
+
+/* Error management */
+
+        /* Returns a string describing the error associated with error number
+          e. The string must not be freed, and it will be overwritten with
+          subsequent calls. */
+
+char *error_index (int e);
+
+/* Building the index */
+
+        /* Creates index from text[0..length-1]. Note that the index is an 
+          opaque data type. Any build option must be passed in string 
+          build_options, whose syntax depends on the index. The index must 
+          always work with some default parameters if build_options is NULL. 
+          The returned index is ready to be queried. */
+
+int build_index (uchar *text, ulong length, char *build_options, void **index);
+
+        /*  Saves index on disk by using single or multiple files, having 
+          proper extensions. */
+
+int save_index (void *index, char *filename);
+
+        /*  Loads index from one or more file(s) named filename, possibly 
+          adding the proper extensions. */
+
+int load_index (char *filename, void **index);
+
+        /* Frees the memory occupied by index. */
+
+int free_index (void *index);
+
+        /* Gives the memory occupied by index in bytes. */
+
+int index_size(void *index, ulong *size);
+
+/* Querying the index */
+
+        /* Writes in numocc the number of occurrences of the substring 
+          pattern[0..length-1] found in the text indexed by index. */
+
+//int count (void *index, uchar *pattern, ulong length, ulong *numocc);
+//
+//        /* Writes in numocc the number of occurrences of the substring 
+//          pattern[0..length-1] in the text indexed by index. It also allocates
+//          occ (which must be freed by the caller) and writes the locations of 
+//          the numocc occurrences in occ, in arbitrary order.  */
+//
+//int locate (void *index, uchar *pattern, ulong length, ulong **occ, 
+//        ulong *numocc);
+//
+//        /* Gives the length of the text indexed */
+//
+//int get_length(void *index, ulong *length);
+//
+///* Accessing the indexed text  */
+//
+//        /*  Allocates snippet (which must be freed by the caller) and writes 
+//          the substring text[from..to] into it. Returns in snippet_length the 
+//          length of the text snippet actually extracted (that could be less 
+//          than to-from+1 if to is larger than the text size). */
+//
+//int extract (void *index, ulong from, ulong to, uchar **snippet, 
+//        ulong *snippet_length);
+//
+//        /* Displays the text (snippet) surrounding any occurrence of the 
+//          substring pattern[0..length-1] within the text indexed by index. 
+//          The snippet must include numc characters before and after the 
+//          pattern occurrence, totalizing length+2*numc characters, or less if 
+//          the text boundaries are reached. Writes in numocc the number of 
+//          occurrences, and allocates the arrays snippet_text and 
+//          snippet_lengths (which must be freed by the caller). The first is a 
+//          character array of numocc*(length+2*numc) characters, with a new 
+//          snippet starting at every multiple of length+2*numc. The second 
+//          gives the real length of each of the numocc snippets. */
+//
+//int display (void *index, uchar *pattern, ulong length, ulong numc, 
+//        ulong *numocc, uchar **snippet_text, ulong **snippet_lengths);
+
+        /*  Obtains the length of the text indexed by index. */
+
+int length (void *index, ulong *length);
+