1*2946cd70SChandler Carruth // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2*2946cd70SChandler Carruth // See https://llvm.org/LICENSE.txt for license information.
3*2946cd70SChandler Carruth // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
410ab2aceSGeorge Karpenkov
510ab2aceSGeorge Karpenkov // The fuzzer must find several constants with swapped bytes.
610ab2aceSGeorge Karpenkov #include <cstdint>
710ab2aceSGeorge Karpenkov #include <cstdio>
810ab2aceSGeorge Karpenkov #include <cstdlib>
910ab2aceSGeorge Karpenkov #include <cstring>
1010ab2aceSGeorge Karpenkov
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)1110ab2aceSGeorge Karpenkov extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
1210ab2aceSGeorge Karpenkov if (Size < 14) return 0;
1310ab2aceSGeorge Karpenkov uint64_t x = 0;
1410ab2aceSGeorge Karpenkov uint32_t y = 0;
155317f2e4SMatt Morehouse uint32_t z = 0;
1610ab2aceSGeorge Karpenkov memcpy(&x, Data, sizeof(x));
1710ab2aceSGeorge Karpenkov memcpy(&y, Data + Size / 2, sizeof(y));
1810ab2aceSGeorge Karpenkov memcpy(&z, Data + Size - sizeof(z), sizeof(z));
1910ab2aceSGeorge Karpenkov
2010ab2aceSGeorge Karpenkov x = __builtin_bswap64(x);
2110ab2aceSGeorge Karpenkov y = __builtin_bswap32(y);
225317f2e4SMatt Morehouse z = __builtin_bswap32(z);
2310ab2aceSGeorge Karpenkov const bool k32bit = sizeof(void*) == 4;
2410ab2aceSGeorge Karpenkov
2510ab2aceSGeorge Karpenkov if ((k32bit || x == 0x46555A5A5A5A5546ULL) &&
2610ab2aceSGeorge Karpenkov z == 0x4F4B &&
2710ab2aceSGeorge Karpenkov y == 0x66757A7A &&
2810ab2aceSGeorge Karpenkov true
2910ab2aceSGeorge Karpenkov ) {
305317f2e4SMatt Morehouse if (Data[Size - 5] == 'z') {
3110ab2aceSGeorge Karpenkov fprintf(stderr, "BINGO; Found the target\n");
3210ab2aceSGeorge Karpenkov exit(1);
3310ab2aceSGeorge Karpenkov }
3410ab2aceSGeorge Karpenkov }
3510ab2aceSGeorge Karpenkov return 0;
3610ab2aceSGeorge Karpenkov }
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