select data structure added

src/select.h

@@ -0,0 +1,61 @@
+#ifndef SELECT_h
+#define SELECT_h
+
+#include "cmph_types.h"
+
+struct _select_t
+{
+	cmph_uint32 n,m;
+	cmph_uint32 * bits_vec;
+	cmph_uint32 * select_table;
+};
+
+typedef struct _select_t select_t;
+
+void select_init(select_t * sel, cmph_uint32 n, cmph_uint32 m);
+
+void select_destroy(select_t * sel);
+ 
+void select_generate(select_t * sel, cmph_uint32 * keys_vec);
+
+cmph_int32 select_query(select_t * sel, cmph_uint32 one_idx);
+
+cmph_int32 select_next_query(select_t * sel, cmph_uint32 vec_bit_idx);
+
+double select_get_space_usage(select_t * sel);
+
+void select_dump(select_t *sel, char **buf, cmph_uint32 *buflen);
+
+void select_load(select_t * sel, const char *buf, cmph_uint32 buflen);
+
+
+/** \fn void select_pack(select_t *sel, void *sel_packed);
+ *  \brief Support the ability to pack a select structure function into a preallocated contiguous memory space pointed by sel_packed.
+ *  \param sel points to the select structure
+ *  \param sel_packed pointer to the contiguous memory area used to store the select structure. The size of sel_packed must be at least @see select_packed_size 
+ */
+void select_pack(select_t *sel, void *sel_packed);
+
+/** \fn cmph_uint32 select_packed_size(select_t *sel);
+ *  \brief Return the amount of space needed to pack a select structure.
+ *  \return the size of the packed select structure or zero for failures
+ */ 
+cmph_uint32 select_packed_size(select_t *sel);
+
+
+/** \fn cmph_int32 select_query_packed(void * sel_packed, cmph_uint32 idx);
+ *  \param sel_packed is a pointer to a contiguous memory area
+ *  \param one_idx is the rank for which we want to calculate the inverse function select
+ *  \return an integer that represents the select value of rank idx.
+ */
+cmph_int32 select_query_packed(void * sel_packed, cmph_uint32 one_idx);
+
+
+/** \fn cmph_int32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx);
+ *  \param sel_packed is a pointer to a contiguous memory area
+ *  \param vec_bit_idx is a value prior computed by @see select_query_packed
+ *  \return an integer that represents the next select value greater than @see vec_bit_idx.
+ */
+cmph_int32 select_next_query_packed(void * sel_packed, cmph_uint32 vec_bit_idx);
+
+#endif