1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2 // See https://llvm.org/LICENSE.txt for license information.
3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4 
5 // The fuzzer must find several constants with swapped bytes.
6 #include <cstdint>
7 #include <cstdio>
8 #include <cstdlib>
9 #include <cstring>
10 
11 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
12   if (Size < 14) return 0;
13   uint64_t x = 0;
14   uint32_t y = 0;
15   uint32_t z = 0;
16   memcpy(&x, Data, sizeof(x));
17   memcpy(&y, Data + Size / 2, sizeof(y));
18   memcpy(&z, Data + Size - sizeof(z), sizeof(z));
19 
20   x = __builtin_bswap64(x);
21   y = __builtin_bswap32(y);
22   z = __builtin_bswap32(z);
23   const bool k32bit = sizeof(void*) == 4;
24 
25   if ((k32bit || x == 0x46555A5A5A5A5546ULL) &&
26       z == 0x4F4B &&
27       y == 0x66757A7A &&
28       true
29       ) {
30     if (Data[Size - 5] == 'z') {
31       fprintf(stderr, "BINGO; Found the target\n");
32       exit(1);
33     }
34   }
35   return 0;
36 }
37