| #include <stdint.h> |
| #include <string.h> |
| |
| static inline uint32_t swapc(uint32_t x, int c) |
| { |
| return c ? x>>24 | x>>8&0xff00 | x<<8&0xff0000 | x<<24 : x; |
| } |
| |
| const char *__mo_lookup(const void *p, size_t size, const char *s) |
| { |
| const uint32_t *mo = p; |
| int sw = *mo - 0x950412de; |
| uint32_t b = 0, n = swapc(mo[2], sw); |
| uint32_t o = swapc(mo[3], sw); |
| uint32_t t = swapc(mo[4], sw); |
| if (n>=size/4 || o>=size-4*n || t>=size-4*n || ((o|t)%4)) |
| return 0; |
| o/=4; |
| t/=4; |
| for (;;) { |
| uint32_t ol = swapc(mo[o+2*(b+n/2)], sw); |
| uint32_t os = swapc(mo[o+2*(b+n/2)+1], sw); |
| if (os >= size || ol >= size-os || ((char *)p)[os+ol]) |
| return 0; |
| int sign = strcmp(s, (char *)p + os); |
| if (!sign) { |
| uint32_t tl = swapc(mo[t+2*(b+n/2)], sw); |
| uint32_t ts = swapc(mo[t+2*(b+n/2)+1], sw); |
| if (ts >= size || tl >= size-ts || ((char *)p)[ts+tl]) |
| return 0; |
| return (char *)p + ts; |
| } |
| else if (n == 1) return 0; |
| else if (sign < 0) |
| n /= 2; |
| else { |
| b += n/2; |
| n -= n/2; |
| } |
| } |
| return 0; |
| } |
