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 // Find ABCxxFxUxZxxx... (2048+ bytes, 'x' is any byte)
6 #include <assert.h>
7 #include <cstddef>
8 #include <cstdint>
9 #include <cstdlib>
10 #include <cstring>
11 #include <cstdio>
12 
13 const size_t N = 2048;
14 typedef const uint8_t *IN;
15 
16 static volatile int one = 1;
17 
18 extern "C" {
19 __attribute__((noinline)) void bad() {
20   fprintf(stderr, "BINGO\n");
21   if (one)
22     abort();
23 }
24 
25 __attribute__((noinline)) void f0(IN in) {
26   uint32_t x = in[5] + 251 * in[7] + 251 * 251 * in[9];
27   if (x == 'F' + 251 * 'U' + 251 * 251 * 'Z')
28     bad();
29 }
30 
31 __attribute__((noinline)) void fC(IN in) { if (in[2] == 'C') f0(in); }
32 __attribute__((noinline)) void fB(IN in) { if (in[1] == 'B') fC(in); }
33 __attribute__((noinline)) void fA(IN in) { if (in[0] == 'A') fB(in); }
34 
35 } // extern "C"
36 
37 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
38   if (Size < N) return 0;
39   fA((IN)Data);
40   return 0;
41 }
42