tests/fuzz/simple_compress.c

/*
 * Copyright (c) 2016-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 */

/**
 * This fuzz target attempts to comprss the fuzzed data with the simple
 * compression function with an output buffer that may be too small to
 * ensure that the compressor never crashes.
 */

#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "fuzz_helpers.h"
#include "zstd.h"

static ZSTD_CCtx *cctx = NULL;

int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
    uint32_t seed = FUZZ_seed(&src, &size);
    size_t const maxSize = ZSTD_compressBound(size);
    int i;
    if (!cctx) {
        cctx = ZSTD_createCCtx();
        FUZZ_ASSERT(cctx);
    }
    /* Run it 10 times over 10 output sizes. Reuse the context. */
    for (i = 0; i < 10; ++i) {
        int const level = (int)FUZZ_rand32(&seed, 0, 19 + 3) - 3; /* [-3, 19] */
        size_t const bufSize = FUZZ_rand32(&seed, 0, maxSize);
        void* rBuf = malloc(bufSize);
        FUZZ_ASSERT(rBuf);
        ZSTD_compressCCtx(cctx, rBuf, bufSize, src, size, level);
        free(rBuf);
    }

#ifndef STATEFUL_FUZZING
    ZSTD_freeCCtx(cctx); cctx = NULL;
#endif
    return 0;
}