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#ifndef HORUS_UTIL_H |
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#define HORUS_UTIL_H |
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/* |
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* horus_util.h - UUID utility functions: validate, compare, extract |
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*/ |
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#include |
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#include |
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/* ── Extract version from binary UUID ───────────────────────────── */ |
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static inline int horus_uuid_version_bin(const unsigned char *uuid) { |
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return (uuid[6] >> 4) & 0x0F; |
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} |
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/* ── Extract variant from binary UUID ───────────────────────────── */ |
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static inline int horus_uuid_variant_bin(const unsigned char *uuid) { |
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unsigned char v = uuid[8]; |
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if ((v & 0x80) == 0) return 0; /* NCS backward compatibility */ |
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if ((v & 0xC0) == 0x80) return 1; /* RFC 9562 (standard) */ |
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0
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0
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if ((v & 0xE0) == 0xC0) return 2; /* Microsoft */ |
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0
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return 3; /* Future/reserved */ |
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} |
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/* ── Compare two binary UUIDs ───────────────────────────────────── */ |
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static inline int horus_uuid_cmp_bin(const unsigned char *a, const unsigned char *b) { |
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return memcmp(a, b, 16); |
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} |
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/* ── Check if NIL ───────────────────────────────────────────────── */ |
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static inline int horus_uuid_is_nil_bin(const unsigned char *uuid) { |
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/* Optimise with 64-bit comparison */ |
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const uint64_t *p = (const uint64_t *)uuid; |
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100
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return (p[0] == 0) && (p[1] == 0); |
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} |
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/* ── Check if MAX ───────────────────────────────────────────────── */ |
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static inline int horus_uuid_is_max_bin(const unsigned char *uuid) { |
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const uint64_t *p = (const uint64_t *)uuid; |
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return (p[0] == UINT64_C(0xFFFFFFFFFFFFFFFF)) |
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100
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&& (p[1] == UINT64_C(0xFFFFFFFFFFFFFFFF)); |
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} |
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/* ── Validate a UUID string (any format) ────────────────────────── */ |
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static inline int horus_uuid_validate(const char *input, size_t len) { |
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unsigned char tmp[16]; |
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100
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if (horus_parse_uuid(tmp, input, len) != HORUS_PARSE_OK) |
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return 0; |
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/* Check that variant is RFC 9562 or it's NIL/MAX */ |
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100
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if (horus_uuid_is_nil_bin(tmp) || horus_uuid_is_max_bin(tmp)) |
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100
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2
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return 1; |
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10
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return (horus_uuid_variant_bin(tmp) == 1) ? 1 : 0; |
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} |
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/* ── Extract timestamp as Unix epoch seconds (NV) ───────────────── */ |
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63
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6
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static inline double horus_uuid_extract_time(const unsigned char *uuid) { |
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6
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int version = horus_uuid_version_bin(uuid); |
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6
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switch (version) { |
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2
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case 1: |
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2
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return horus_gregorian_to_unix(horus_extract_time_v1(uuid)); |
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1
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case 6: |
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1
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return horus_gregorian_to_unix(horus_extract_time_v6(uuid)); |
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2
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case 7: |
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2
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return horus_ms_to_unix(horus_extract_time_v7(uuid)); |
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1
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default: |
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1
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return 0.0; /* No timestamp for other versions */ |
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} |
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} |
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77
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#endif /* HORUS_UTIL_H */ |