diff options
Diffstat (limited to 'strings/strings_def.h')
| -rw-r--r-- | strings/strings_def.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/strings/strings_def.h b/strings/strings_def.h index 6bd8e8f5575..d601f5ca697 100644 --- a/strings/strings_def.h +++ b/strings/strings_def.h @@ -100,4 +100,20 @@ static inline const uchar *skip_trailing_space(const uchar *ptr,size_t len) end--; return (end); } + +/* Macros for hashing characters */ + +#define MY_HASH_ADD(A, B, value) \ + do { A^= (((A & 63)+B)*((value)))+ (A << 8); B+=3; } while(0) + +#define MY_HASH_ADD_16(A, B, value) \ + do { MY_HASH_ADD(A, B, ((value) & 0xFF)) ; MY_HASH_ADD(A, B, ((value >>8 ))); } while(0) + +/* + This one is needed to ensure we get the exact same hash as MariaDB 5.1 + This is needed to ensure that old partitioned tables still work as before. +*/ +#define MY_HASH_ADD_16_INV(A, B, value) \ + do { MY_HASH_ADD(A, B, ((value >> 8))) ; MY_HASH_ADD(A, B, ((value & 0xFF ))); } while(0) + #endif |