/*

 * Copyright (c) Meta Platforms, Inc. and affiliates.

 * 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).

 * You may select, at your option, one of the above-listed licenses.

 */

/**

 * This fuzz target attempts to compress 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"

#include "zstd_errors.h"

#include "zstd_helpers.h"

#include "fuzz_data_producer.h"

#include "fuzz_third_party_seq_prod.h"

static ZSTD_CCtx *cctx = NULL;

int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)

{

    FUZZ_SEQ_PROD_SETUP();

    /* Give a random portion of src data to the producer, to use for

    parameter generation. The rest will be used for (de)compression */

    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);

    size = FUZZ_dataProducer_reserveDataPrefix(producer);

    size_t const maxSize = ZSTD_compressBound(size);

    size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, maxSize);

    int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel);

    if (!cctx) {

        cctx = ZSTD_createCCtx();

        FUZZ_ASSERT(cctx);

    }

    void *rBuf = FUZZ_malloc(bufSize);

    size_t const ret = ZSTD_compressCCtx(cctx, rBuf, bufSize, src, size, cLevel);

    if (ZSTD_isError(ret)) {

        FUZZ_ASSERT(ZSTD_getErrorCode(ret) == ZSTD_error_dstSize_tooSmall);

    }

    free(rBuf);

    FUZZ_dataProducer_free(producer);

#ifndef STATEFUL_FUZZING

    ZSTD_freeCCtx(cctx); cctx = NULL;

#endif

    FUZZ_SEQ_PROD_TEARDOWN();

    return 0;

}