1 // This file is distributed under the University of Illinois Open Source
2 // License. See LICENSE.TXT for details.
3 
4 // Find ABCxxFxUxZxxx... (2048+ bytes, 'x' is any byte)
5 #include <assert.h>
6 #include <cstddef>
7 #include <cstdint>
8 #include <cstdlib>
9 #include <cstring>
10 #include <cstdio>
11 
12 const size_t N = 2048;
13 typedef const uint8_t *IN;
14 
15 __attribute__((noinline)) void bad() {
16   fprintf(stderr, "BINGO\n");
17   abort();
18 }
19 
20 __attribute__((noinline)) void f0(IN in) {
21   uint32_t x = in[5] + 251 * in[7] + 251 * 251 * in[9];
22   if (x == 'F' + 251 * 'U' + 251 * 251 * 'Z')
23     bad();
24 }
25 
26 __attribute__((noinline)) void fC(IN in) { if (in[2] == 'C') f0(in); }
27 __attribute__((noinline)) void fB(IN in) { if (in[1] == 'B') fC(in); }
28 __attribute__((noinline)) void fA(IN in) { if (in[0] == 'A') fB(in); }
29 
30 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
31   if (Size < N) return 0;
32   fA((IN)Data);
33   return 0;
34 }
35