71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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/**
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* Helper functions for fuzzing.
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*/
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#ifndef FUZZ_HELPERS_H
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#define FUZZ_HELPERS_H
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#include "fuzz.h"
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#include "xxhash.h"
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#include <stdint.h>
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#include <stdio.h>
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define FUZZ_QUOTE_IMPL(str) #str
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#define FUZZ_QUOTE(str) FUZZ_QUOTE_IMPL(str)
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/**
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* Asserts for fuzzing that are always enabled.
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*/
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#define FUZZ_ASSERT_MSG(cond, msg) \
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((cond) ? (void)0 \
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: (fprintf(stderr, "%s: %u: Assertion: `%s' failed. %s\n", __FILE__, \
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__LINE__, FUZZ_QUOTE(cond), (msg)), \
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abort()))
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#define FUZZ_ASSERT(cond) FUZZ_ASSERT_MSG((cond), "");
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#if defined(__GNUC__)
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#define FUZZ_STATIC static __inline __attribute__((unused))
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#elif defined(__cplusplus) || \
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(defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
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#define FUZZ_STATIC static inline
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#elif defined(_MSC_VER)
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#define FUZZ_STATIC static __inline
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#else
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#define FUZZ_STATIC static
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#endif
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/**
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* Determininistically constructs a seed based on the fuzz input.
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* Only looks at the first FUZZ_RNG_SEED_SIZE bytes of the input.
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*/
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FUZZ_STATIC uint32_t FUZZ_seed(const uint8_t *src, size_t size) {
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size_t const toHash = MIN(FUZZ_RNG_SEED_SIZE, size);
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return XXH32(src, toHash, 0);
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}
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#define FUZZ_rotl32(x, r) (((x) << (r)) | ((x) >> (32 - (r))))
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FUZZ_STATIC uint32_t FUZZ_rand(uint32_t *state) {
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static const uint32_t prime1 = 2654435761U;
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static const uint32_t prime2 = 2246822519U;
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uint32_t rand32 = *state;
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rand32 *= prime1;
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rand32 += prime2;
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rand32 = FUZZ_rotl32(rand32, 13);
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*state = rand32;
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return rand32 >> 5;
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}
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#endif
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