1*10ab2aceSGeorge Karpenkov // This file is distributed under the University of Illinois Open Source 2*10ab2aceSGeorge Karpenkov // License. See LICENSE.TXT for details. 3*10ab2aceSGeorge Karpenkov 4*10ab2aceSGeorge Karpenkov // The fuzzer must find several constants with swapped bytes. 5*10ab2aceSGeorge Karpenkov #include <cstdint> 6*10ab2aceSGeorge Karpenkov #include <cstdio> 7*10ab2aceSGeorge Karpenkov #include <cstdlib> 8*10ab2aceSGeorge Karpenkov #include <cstring> 9*10ab2aceSGeorge Karpenkov 10*10ab2aceSGeorge Karpenkov extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { 11*10ab2aceSGeorge Karpenkov if (Size < 14) return 0; 12*10ab2aceSGeorge Karpenkov uint64_t x = 0; 13*10ab2aceSGeorge Karpenkov uint32_t y = 0; 14*10ab2aceSGeorge Karpenkov uint16_t z = 0; 15*10ab2aceSGeorge Karpenkov memcpy(&x, Data, sizeof(x)); 16*10ab2aceSGeorge Karpenkov memcpy(&y, Data + Size / 2, sizeof(y)); 17*10ab2aceSGeorge Karpenkov memcpy(&z, Data + Size - sizeof(z), sizeof(z)); 18*10ab2aceSGeorge Karpenkov 19*10ab2aceSGeorge Karpenkov x = __builtin_bswap64(x); 20*10ab2aceSGeorge Karpenkov y = __builtin_bswap32(y); 21*10ab2aceSGeorge Karpenkov z = __builtin_bswap16(z); 22*10ab2aceSGeorge Karpenkov const bool k32bit = sizeof(void*) == 4; 23*10ab2aceSGeorge Karpenkov 24*10ab2aceSGeorge Karpenkov if ((k32bit || x == 0x46555A5A5A5A5546ULL) && 25*10ab2aceSGeorge Karpenkov z == 0x4F4B && 26*10ab2aceSGeorge Karpenkov y == 0x66757A7A && 27*10ab2aceSGeorge Karpenkov true 28*10ab2aceSGeorge Karpenkov ) { 29*10ab2aceSGeorge Karpenkov if (Data[Size - 3] == 'z') { 30*10ab2aceSGeorge Karpenkov fprintf(stderr, "BINGO; Found the target\n"); 31*10ab2aceSGeorge Karpenkov exit(1); 32*10ab2aceSGeorge Karpenkov } 33*10ab2aceSGeorge Karpenkov } 34*10ab2aceSGeorge Karpenkov return 0; 35*10ab2aceSGeorge Karpenkov } 36