/**

 * 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 <stdint.h>

#include <stdlib.h>

#include <string.h>

#include "fuzz_helpers.h"

#include "lz4.h"

#include "lz4frame.h"

#include "lz4_helpers.h"

#include "fuzz_data_producer.h"

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);

    LZ4F_preferences_t const prefs = FUZZ_dataProducer_preferences(producer);

    size_t const dstCapacitySeed = FUZZ_dataProducer_retrieve32(producer);

    size = FUZZ_dataProducer_remainingBytes(producer);

    size_t const compressBound = LZ4F_compressFrameBound(size, &prefs);

    size_t const dstCapacity = FUZZ_getRange_from_uint32(dstCapacitySeed, 0, compressBound);

    char* const dst = (char*)malloc(dstCapacity);

    char* const rt = (char*)malloc(size);

    FUZZ_ASSERT(dst!=NULL);

    FUZZ_ASSERT(rt!=NULL);

    /* If compression succeeds it must round trip correctly. */

    size_t const dstSize =

            LZ4F_compressFrame(dst, dstCapacity, data, size, &prefs);

    if (!LZ4F_isError(dstSize)) {

        size_t const rtSize = FUZZ_decompressFrame(rt, size, dst, dstSize);

        FUZZ_ASSERT_MSG(rtSize == size, "Incorrect regenerated size");

        FUZZ_ASSERT_MSG(!memcmp(data, rt, size), "Corruption!");

    }

    free(dst);

    free(rt);

    FUZZ_dataProducer_free(producer);

    return 0;

}