93 lines
2.6 KiB
C
93 lines
2.6 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 both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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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 "zstd.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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#define FUZZ_ZASSERT(code) \
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FUZZ_ASSERT_MSG(!ZSTD_isError(code), ZSTD_getErrorName(code))
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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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* Consumes up to the first FUZZ_RNG_SEED_SIZE bytes of the input.
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*/
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FUZZ_STATIC uint32_t FUZZ_seed(uint8_t const **src, size_t* size) {
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uint8_t const *data = *src;
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size_t const toHash = MIN(FUZZ_RNG_SEED_SIZE, *size);
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*size -= toHash;
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*src += toHash;
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return XXH32(data, 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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/* Returns a random numer in the range [min, max]. */
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FUZZ_STATIC uint32_t FUZZ_rand32(uint32_t *state, uint32_t min, uint32_t max) {
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uint32_t random = FUZZ_rand(state);
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return min + (random % (max - min + 1));
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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