| #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; |
| } |
