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added hashlib::mkhash_init

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This commit is contained in:
Clifford Wolf 2014-12-30 18:51:24 +01:00
parent ba43cf5807
commit 0675098733
4 changed files with 8 additions and 5 deletions
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8
kernel/hashlib.h
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@ -21,13 +21,15 @@ const int hashtable_size_trigger = 2;
const int hashtable_size_factor = 3;
// The XOR version of DJB2
// (traditionally 5381 is used as starting value for the djb2 hash)
inline unsigned int mkhash(unsigned int a, unsigned int b) {
return ((a << 5) + a) ^ b;
}
// traditionally 5381 is used as starting value for the djb2 hash
const unsigned int mkhash_init = 5381;
// The ADD version of DJB2
// (use this version for cache locality in b)
// (usunsigned int mkhashe this version for cache locality in b)
inline unsigned int mkhash_add(unsigned int a, unsigned int b) {
return ((a << 5) + a) + b;
}
@ -96,7 +98,7 @@ struct hash_cstr_ops {
return true;
}
unsigned int hash(const char *a) const {
unsigned int hash = 5381;
unsigned int hash = mkhash_init;
while (*a)
hash = mkhash(hash, *(a++));
return hash;