diff options
-rw-r--r-- | libass/ass_utils.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/libass/ass_utils.h b/libass/ass_utils.h index 6d795f0..4e2ba6c 100644 --- a/libass/ass_utils.h +++ b/libass/ass_utils.h @@ -132,11 +132,16 @@ static inline int rot_key(double a) static inline unsigned fnv_32a_buf(void *buf, size_t len, unsigned hval) { unsigned char *bp = buf; - unsigned char *be = bp + len; - while (bp < be) { - hval ^= (unsigned) *bp++; - hval *= FNV1_32A_PRIME; + size_t n = (len + 3) / 4; + + switch (len % 4) { + case 0: do { hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME; + case 3: hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME; + case 2: hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME; + case 1: hval ^= (unsigned) *bp++; hval *= FNV1_32A_PRIME; + } while (--n > 0); } + return hval; } static inline unsigned fnv_32a_str(char *str, unsigned hval) |