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#ifndef NU_UDB_H
#define NU_UDB_H
#include <stdint.h>
#include <sys/types.h>
#include <libnu/config.h>
#include <libnu/defines.h>
#include <libnu/mph.h>
#include <libnu/strings.h>
#include <libnu/utf8.h>
/** @defgroup udb Unicode database
*
* Note: never use it directly, it is subject to change in next releases
*/
#if defined (__cplusplus) || defined (c_plusplus)
extern "C" {
#endif
#ifdef NU_WITH_UDB
#define NU_UDB_DECODING_FUNCTION (nu_utf8_read)
#define nu_udb_read (nu_utf8_read)
/** Lookup value in UDB
*
* Similar to nu_udb_lookup(), but doesn't look into COMBINED
*
* @ingroup udb
* @see nu_udb_lookup
* @return raw value from VALUES_I or 0 if value wasn't found
*/
static inline
uint32_t nu_udb_lookup_value(uint32_t codepoint,
const int16_t *G, size_t G_SIZE,
const uint32_t *VALUES_C, const uint16_t *VALUES_I) {
uint32_t hash = nu_mph_hash(G, G_SIZE, codepoint);
uint32_t value = nu_mph_lookup(VALUES_C, VALUES_I, codepoint, hash);
return value;
}
/** Lookup data in UDB
*
* Returned data is encoded, therefore you need to use p = it(p, &u) to
* fetch it. Returned string might contain more than 1 codepoint.
*
* @ingroup udb
* @param codepoint unicode codepoint
* @param G first MPH table
* @param G_SIZE first table number of elements (original MPH set size)
* @param VALUES_C codepoints array
* @param VALUES_I offsets array
* @param COMBINED joined values addressed by index stored in VALUES
* @return looked up data or 0
*/
static inline
const char* nu_udb_lookup(uint32_t codepoint,
const int16_t *G, size_t G_SIZE,
const uint32_t *VALUES_C, const uint16_t *VALUES_I, const uint8_t *COMBINED) {
uint32_t combined_offset = nu_udb_lookup_value(codepoint,
G, G_SIZE, VALUES_C, VALUES_I);
if (combined_offset == 0) {
return 0;
}
return (const char *)(COMBINED + combined_offset);
}
#endif /* NU_WITH_UDB */
#if defined (__cplusplus) || defined (c_plusplus)
}
#endif
#endif /* NU_UDB_H */
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