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feat(string): add SStrHash64

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Adam Heinermann 2025-11-14 23:29:33 -08:00 • committed by fallenoak
parent a36aded763
commit 0250f274ca
6 changed files with 235 additions and 1 deletions
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51
storm/String.cpp
View file

@ -57,6 +57,13 @@ const uint32_t s_hashtable[16] = {
0xE3061AE7, 0xA39B0FA1, 0x9797F25F, 0xE4444563,
};
const uint64_t s_hashtable64[16] = {
0x486E26EEDCAA16B3ULL, 0xE1918EEF202DAFDBULL, 0x341C7DC71C365303ULL, 0x40EF2D3765FD5E49ULL,
0xD6057177904ECE93ULL, 0x1C38024F98FD323BULL, 0xE3061AE7A39B0FA1ULL, 0x9797F25FE4444563ULL,
0xCD2EC20C8DC1B898ULL, 0x31759633799A306DULL, 0x8C2063852E6E9627ULL, 0x79237D9973922C66ULL,
0x8728628D28628824ULL, 0x8F1F7E9625887795ULL, 0x296E3281389C0D60ULL, 0x6F4893CA61636542ULL,
};
void GetNextTextUpper(uint32_t* orig, const char** string, uint32_t* upper) {
uint8_t byte = **string;
int32_t v3 = bytesFromUTF8[byte];
@ -423,6 +430,50 @@ uint32_t STORMAPI SStrHashHT(const char* string) {
return bjhash((uint8_t*)&normalized, length, 0);
}
int64_t STORMAPI SStrHash64(const char* string, uint32_t flags, int64_t seed) {
STORM_VALIDATE_BEGIN;
STORM_VALIDATE(string);
STORM_VALIDATE_END;
int64_t result = seed ? seed : 0x7FED7FED7FED7FEDLL;
int64_t adjust = 0xEEEEEEEEEEEEEEEELL;
uint32_t ch;
if (flags & SSTR_HASH_CASESENSITIVE) {
for (; *string; string++) {
ch = static_cast<uint8_t>(*string);
#if defined(WHOA_SSTRHASH64_SUBTRACTS)
result = (s_hashtable64[ch / 16] - s_hashtable64[ch % 16]) ^ (adjust + result);
#else
result = (s_hashtable64[ch / 16] + s_hashtable64[ch % 16]) ^ (adjust + result);
#endif
adjust = 33 * adjust + result + ch + 3;
}
}
else {
for (; *string; string++) {
ch = static_cast<uint8_t>(*string);
if (ch >= 'a' && ch <= 'z') {
ch -= 32;
}
if (ch == '/') {
ch = '\\';
}
#if defined(WHOA_SSTRHASH64_SUBTRACTS)
result = (s_hashtable64[ch / 16] - s_hashtable64[ch % 16]) ^ (adjust + result);
#else
result = (s_hashtable64[ch / 16] + s_hashtable64[ch % 16]) ^ (adjust + result);
#endif
adjust = 33 * adjust + result + ch + 3;
}
}
return result ? result : 1LL;
}
size_t STORMAPI SStrLen(const char* string) {
STORM_VALIDATE_BEGIN;
STORM_VALIDATE(string);

2
storm/String.hpp
View file

@ -30,6 +30,8 @@ uint32_t STORMAPI SStrHash(const char* string, uint32_t flags = 0, uint32_t seed
uint32_t STORMAPI SStrHashHT(const char* string);
int64_t STORMAPI SStrHash64(const char* string, uint32_t flags = 0, int64_t seed = 0);
size_t STORMAPI SStrLen(const char* string);
void STORMAPI SStrLower(char* string);