| 1 | #ifndef NU_UDB_H |
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| 2 | #define NU_UDB_H |
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| 3 | |
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| 4 | #include <stdint.h> |
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| 5 | #include <sys/types.h> |
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| 6 | |
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| 7 | #include <libnu/config.h> |
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| 8 | #include <libnu/defines.h> |
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| 9 | #include <libnu/mph.h> |
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| 10 | #include <libnu/strings.h> |
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| 11 | #include <libnu/utf8.h> |
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| 12 | |
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| 13 | /** @defgroup udb Unicode database |
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| 14 | * |
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| 15 | * Note: never use it directly, it is subject to change in next releases |
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| 16 | */ |
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| 17 | |
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| 18 | #if defined (__cplusplus) || defined (c_plusplus) |
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| 19 | extern "C" { |
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| 20 | #endif |
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| 21 | |
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| 22 | #ifdef NU_WITH_UDB |
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| 23 | |
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| 24 | #define NU_UDB_DECODING_FUNCTION (nu_utf8_read) |
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| 25 | #define nu_udb_read (nu_utf8_read) |
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| 26 | |
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| 27 | /** Lookup value in UDB |
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| 28 | * |
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| 29 | * Similar to nu_udb_lookup(), but doesn't look into COMBINED |
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| 30 | * |
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| 31 | * @ingroup udb |
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| 32 | * @see nu_udb_lookup |
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| 33 | * @return raw value from VALUES_I or 0 if value wasn't found |
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| 34 | */ |
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| 35 | static inline |
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| 36 | uint32_t nu_udb_lookup_value(uint32_t codepoint, |
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| 37 | const int16_t *G, size_t G_SIZE, |
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| 38 | const uint32_t *VALUES_C, const uint16_t *VALUES_I) { |
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| 39 | |
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| 40 | uint32_t hash = nu_mph_hash(G, G_SIZE, codepoint); |
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| 41 | uint32_t value = nu_mph_lookup(V_C: VALUES_C, V_I: VALUES_I, codepoint, hash); |
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| 42 | |
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| 43 | return value; |
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| 44 | } |
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| 45 | |
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| 46 | /** Lookup data in UDB |
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| 47 | * |
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| 48 | * Returned data is encoded, therefore you need to use p = it(p, &u) to |
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| 49 | * fetch it. Returned string might contain more than 1 codepoint. |
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| 50 | * |
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| 51 | * @ingroup udb |
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| 52 | * @param codepoint unicode codepoint |
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| 53 | * @param G first MPH table |
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| 54 | * @param G_SIZE first table number of elements (original MPH set size) |
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| 55 | * @param VALUES_C codepoints array |
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| 56 | * @param VALUES_I offsets array |
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| 57 | * @param COMBINED joined values addressed by index stored in VALUES |
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| 58 | * @return looked up data or 0 |
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| 59 | */ |
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| 60 | static inline |
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| 61 | const char* nu_udb_lookup(uint32_t codepoint, |
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| 62 | const int16_t *G, size_t G_SIZE, |
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| 63 | const uint32_t *VALUES_C, const uint16_t *VALUES_I, const uint8_t *COMBINED) { |
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| 64 | |
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| 65 | uint32_t combined_offset = nu_udb_lookup_value(codepoint, |
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| 66 | G, G_SIZE, VALUES_C, VALUES_I); |
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| 67 | |
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| 68 | if (combined_offset == 0) { |
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| 69 | return 0; |
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| 70 | } |
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| 71 | |
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| 72 | return (const char *)(COMBINED + combined_offset); |
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| 73 | } |
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| 74 | |
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| 75 | #endif /* NU_WITH_UDB */ |
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| 76 | |
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| 77 | #if defined (__cplusplus) || defined (c_plusplus) |
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| 78 | } |
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| 79 | #endif |
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| 80 | |
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| 81 | #endif /* NU_UDB_H */ |
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| 82 | |
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